1 | /* -*- c++ -*- |
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2 | * File : vci_cc_vcache_wrapper.cpp |
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3 | * Copyright (c) UPMC, Lip6, SoC |
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4 | * Authors : Alain GREINER, Yang GAO |
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5 | * |
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6 | * SOCLIB_LGPL_HEADER_BEGIN |
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7 | * |
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8 | * This file is part of SoCLib, GNU LGPLv2.1. |
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9 | * |
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10 | * SoCLib is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU Lesser General Public License as published |
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12 | * by the Free Software Foundation; version 2.1 of the License. |
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13 | * |
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14 | * SoCLib is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * Lesser General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU Lesser General Public |
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20 | * License along with SoCLib; if not, write to the Free Software |
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21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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22 | * 02110-1301 USA |
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23 | * |
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24 | * SOCLIB_LGPL_HEADER_END |
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25 | * |
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26 | * Maintainers: cesar.fuguet-tortolero@lip6.fr |
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27 | * alexandre.joannou@lip6.fr |
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28 | */ |
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29 | |
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30 | #include <cassert> |
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31 | #include <signal.h> |
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32 | |
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33 | #include "arithmetics.h" |
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34 | #include "../include/vci_cc_vcache_wrapper.h" |
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35 | |
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36 | #define DEBUG_DCACHE 1 |
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37 | #define DEBUG_ICACHE 1 |
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38 | #define DEBUG_CMD 0 |
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39 | |
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40 | namespace soclib { |
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41 | namespace caba { |
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42 | |
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43 | namespace { |
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44 | const char * icache_fsm_state_str[] = { |
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45 | "ICACHE_IDLE", |
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46 | |
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47 | "ICACHE_XTN_TLB_FLUSH", |
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48 | "ICACHE_XTN_CACHE_FLUSH", |
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49 | "ICACHE_XTN_CACHE_FLUSH_GO", |
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50 | "ICACHE_XTN_TLB_INVAL", |
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51 | "ICACHE_XTN_CACHE_INVAL_VA", |
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52 | "ICACHE_XTN_CACHE_INVAL_PA", |
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53 | "ICACHE_XTN_CACHE_INVAL_GO", |
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54 | |
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55 | "ICACHE_TLB_WAIT", |
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56 | |
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57 | "ICACHE_MISS_SELECT", |
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58 | "ICACHE_MISS_CLEAN", |
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59 | "ICACHE_MISS_WAIT", |
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60 | "ICACHE_MISS_DATA_UPDT", |
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61 | "ICACHE_MISS_DIR_UPDT", |
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62 | |
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63 | "ICACHE_UNC_WAIT", |
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64 | |
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65 | "ICACHE_CC_CHECK", |
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66 | "ICACHE_CC_UPDT", |
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67 | "ICACHE_CC_INVAL", |
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68 | }; |
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69 | |
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70 | const char * dcache_fsm_state_str[] = { |
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71 | "DCACHE_IDLE", |
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72 | |
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73 | "DCACHE_TLB_MISS", |
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74 | "DCACHE_TLB_PTE1_GET", |
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75 | "DCACHE_TLB_PTE1_SELECT", |
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76 | "DCACHE_TLB_PTE1_UPDT", |
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77 | "DCACHE_TLB_PTE2_GET", |
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78 | "DCACHE_TLB_PTE2_SELECT", |
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79 | "DCACHE_TLB_PTE2_UPDT", |
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80 | "DCACHE_TLB_LR_UPDT", |
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81 | "DCACHE_TLB_LR_WAIT", |
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82 | "DCACHE_TLB_RETURN", |
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83 | |
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84 | "DCACHE_XTN_SWITCH", |
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85 | "DCACHE_XTN_SYNC", |
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86 | "DCACHE_XTN_IC_INVAL_VA", |
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87 | "DCACHE_XTN_IC_FLUSH", |
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88 | "DCACHE_XTN_IC_INVAL_PA", |
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89 | "DCACHE_XTN_IC_PADDR_EXT", |
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90 | "DCACHE_XTN_IT_INVAL", |
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91 | "DCACHE_XTN_DC_FLUSH", |
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92 | "DCACHE_XTN_DC_FLUSH_GO", |
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93 | "DCACHE_XTN_DC_INVAL_VA", |
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94 | "DCACHE_XTN_DC_INVAL_PA", |
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95 | "DCACHE_XTN_DC_INVAL_END", |
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96 | "DCACHE_XTN_DC_INVAL_GO", |
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97 | "DCACHE_XTN_DT_INVAL", |
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98 | |
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99 | "DCACHE_DIRTY_GET_PTE", |
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100 | "DCACHE_DIRTY_WAIT", |
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101 | |
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102 | "DCACHE_MISS_SELECT", |
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103 | "DCACHE_MISS_CLEAN", |
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104 | "DCACHE_MISS_WAIT", |
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105 | "DCACHE_MISS_DATA_UPDT", |
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106 | "DCACHE_MISS_DIR_UPDT", |
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107 | |
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108 | "DCACHE_UNC_WAIT", |
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109 | "DCACHE_LL_WAIT", |
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110 | "DCACHE_SC_WAIT", |
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111 | |
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112 | "DCACHE_CC_CHECK", |
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113 | "DCACHE_CC_UPDT", |
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114 | "DCACHE_CC_INVAL", |
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115 | |
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116 | "DCACHE_INVAL_TLB_SCAN", |
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117 | }; |
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118 | |
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119 | const char * cmd_fsm_state_str[] = { |
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120 | "CMD_IDLE", |
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121 | "CMD_INS_MISS", |
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122 | "CMD_INS_UNC", |
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123 | "CMD_DATA_MISS", |
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124 | "CMD_DATA_UNC_READ", |
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125 | "CMD_DATA_UNC_WRITE", |
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126 | "CMD_DATA_WRITE", |
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127 | "CMD_DATA_LL", |
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128 | "CMD_DATA_SC", |
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129 | "CMD_DATA_CAS", |
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130 | }; |
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131 | |
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132 | const char * vci_pktid_type_str[] = { |
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133 | "TYPE_DATA_UNC", |
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134 | "TYPE_READ_DATA_MISS", |
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135 | "TYPE_READ_INS_UNC", |
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136 | "TYPE_READ_INS_MISS", |
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137 | "TYPE_WRITE", |
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138 | "TYPE_CAS", |
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139 | "TYPE_LL", |
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140 | "TYPE_SC", |
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141 | }; |
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142 | |
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143 | const char * vci_cmd_type_str[] = { |
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144 | "NOP or STORE_COND", |
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145 | "READ", |
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146 | "WRITE", |
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147 | "LOCKED_READ" |
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148 | }; |
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149 | |
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150 | const char * rsp_fsm_state_str[] = { |
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151 | "RSP_IDLE", |
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152 | "RSP_INS_MISS", |
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153 | "RSP_INS_UNC", |
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154 | "RSP_DATA_MISS", |
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155 | "RSP_DATA_UNC", |
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156 | "RSP_DATA_LL", |
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157 | "RSP_DATA_WRITE", |
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158 | }; |
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159 | |
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160 | const char * cc_receive_fsm_state_str[] = { |
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161 | "CC_RECEIVE_IDLE", |
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162 | "CC_RECEIVE_BRDCAST_HEADER", |
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163 | "CC_RECEIVE_BRDCAST_NLINE", |
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164 | "CC_RECEIVE_INS_INVAL_HEADER", |
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165 | "CC_RECEIVE_INS_INVAL_NLINE", |
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166 | "CC_RECEIVE_INS_UPDT_HEADER", |
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167 | "CC_RECEIVE_INS_UPDT_NLINE", |
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168 | "CC_RECEIVE_INS_UPDT_DATA", |
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169 | "CC_RECEIVE_DATA_INVAL_HEADER", |
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170 | "CC_RECEIVE_DATA_INVAL_NLINE", |
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171 | "CC_RECEIVE_DATA_UPDT_HEADER", |
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172 | "CC_RECEIVE_DATA_UPDT_NLINE", |
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173 | "CC_RECEIVE_DATA_UPDT_DATA", |
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174 | }; |
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175 | |
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176 | const char * cc_send_fsm_state_str[] = { |
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177 | "CC_SEND_IDLE", |
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178 | "CC_SEND_CLEANUP_1", |
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179 | "CC_SEND_CLEANUP_2", |
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180 | "CC_SEND_MULTI_ACK", |
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181 | }; |
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182 | } |
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183 | |
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184 | #define tmpl(...) \ |
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185 | template<typename vci_param, \ |
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186 | size_t dspin_in_width, \ |
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187 | size_t dspin_out_width, \ |
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188 | typename iss_t> __VA_ARGS__ \ |
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189 | VciCcVCacheWrapper<vci_param, dspin_in_width, dspin_out_width, iss_t> |
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190 | |
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191 | using namespace soclib::common; |
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192 | |
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193 | ///////////////////////////////// |
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194 | tmpl(/**/)::VciCcVCacheWrapper( |
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195 | sc_module_name name, |
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196 | const int proc_id, |
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197 | const MappingTable &mtd, |
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198 | const IntTab &srcid, |
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199 | const size_t cc_global_id, |
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200 | const size_t itlb_ways, |
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201 | const size_t itlb_sets, |
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202 | const size_t dtlb_ways, |
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203 | const size_t dtlb_sets, |
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204 | const size_t icache_ways, |
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205 | const size_t icache_sets, |
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206 | const size_t icache_words, |
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207 | const size_t dcache_ways, |
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208 | const size_t dcache_sets, |
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209 | const size_t dcache_words, |
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210 | const size_t wbuf_nlines, |
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211 | const size_t wbuf_nwords, |
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212 | const size_t x_width, |
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213 | const size_t y_width, |
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214 | const uint32_t max_frozen_cycles, |
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215 | const uint32_t debug_start_cycle, |
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216 | const bool debug_ok) |
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217 | : soclib::caba::BaseModule(name), |
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218 | |
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219 | p_clk("p_clk"), |
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220 | p_resetn("p_resetn"), |
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221 | p_vci("p_vci"), |
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222 | p_dspin_m2p("p_dspin_m2p"), |
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223 | p_dspin_p2m("p_dspin_p2m"), |
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224 | p_dspin_clack("p_dspin_clack"), |
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225 | |
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226 | m_cacheability_table( mtd.getCacheabilityTable()), |
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227 | m_srcid(mtd.indexForId(srcid)), |
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228 | m_cc_global_id(cc_global_id), |
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229 | m_nline_width(vci_param::N - (uint32_log2(dcache_words)) - 2), |
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230 | m_itlb_ways(itlb_ways), |
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231 | m_itlb_sets(itlb_sets), |
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232 | m_dtlb_ways(dtlb_ways), |
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233 | m_dtlb_sets(dtlb_sets), |
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234 | m_icache_ways(icache_ways), |
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235 | m_icache_sets(icache_sets), |
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236 | m_icache_yzmask((~0) << (uint32_log2(icache_words) + 2)), |
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237 | m_icache_words(icache_words), |
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238 | m_dcache_ways(dcache_ways), |
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239 | m_dcache_sets(dcache_sets), |
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240 | m_dcache_yzmask((~0) << (uint32_log2(dcache_words) + 2)), |
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241 | m_dcache_words(dcache_words), |
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242 | m_x_width(x_width), |
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243 | m_y_width(y_width), |
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244 | m_proc_id(proc_id), |
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245 | m_max_frozen_cycles(max_frozen_cycles), |
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246 | m_paddr_nbits(vci_param::N), |
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247 | m_debug_start_cycle(debug_start_cycle), |
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248 | m_debug_ok(debug_ok), |
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249 | m_dcache_paddr_ext_reset(0), |
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250 | m_icache_paddr_ext_reset(0), |
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251 | |
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252 | r_mmu_ptpr("r_mmu_ptpr"), |
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253 | r_mmu_mode("r_mmu_mode"), |
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254 | r_mmu_word_lo("r_mmu_word_lo"), |
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255 | r_mmu_word_hi("r_mmu_word_hi"), |
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256 | r_mmu_ibvar("r_mmu_ibvar"), |
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257 | r_mmu_dbvar("r_mmu_dbvar"), |
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258 | r_mmu_ietr("r_mmu_ietr"), |
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259 | r_mmu_detr("r_mmu_detr"), |
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260 | |
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261 | r_icache_fsm("r_icache_fsm"), |
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262 | r_icache_fsm_save("r_icache_fsm_save"), |
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263 | r_icache_vci_paddr("r_icache_vci_paddr"), |
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264 | r_icache_vaddr_save("r_icache_vaddr_save"), |
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265 | |
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266 | r_icache_miss_way("r_icache_miss_way"), |
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267 | r_icache_miss_set("r_icache_miss_set"), |
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268 | r_icache_miss_word("r_icache_miss_word"), |
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269 | r_icache_miss_inval("r_icache_miss_inval"), |
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270 | r_icache_miss_clack("r_icache_miss_clack"), |
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271 | |
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272 | r_icache_cc_way("r_icache_cc_way"), |
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273 | r_icache_cc_set("r_icache_cc_set"), |
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274 | r_icache_cc_word("r_icache_cc_word"), |
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275 | r_icache_cc_need_write("r_icache_cc_need_write"), |
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276 | |
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277 | r_icache_flush_count("r_icache_flush_count"), |
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278 | |
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279 | r_icache_miss_req("r_icache_miss_req"), |
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280 | r_icache_unc_req("r_icache_unc_req"), |
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281 | |
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282 | r_icache_tlb_miss_req("r_icache_tlb_read_req"), |
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283 | r_icache_tlb_rsp_error("r_icache_tlb_rsp_error"), |
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284 | |
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285 | r_icache_cleanup_victim_req("r_icache_cleanup_victim_req"), |
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286 | r_icache_cleanup_victim_nline("r_icache_cleanup_victim_nline"), |
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287 | |
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288 | r_icache_cc_send_req("r_icache_cc_send_req"), |
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289 | r_icache_cc_send_type("r_icache_cc_send_type"), |
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290 | r_icache_cc_send_nline("r_icache_cc_send_nline"), |
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291 | r_icache_cc_send_way("r_icache_cc_send_way"), |
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292 | r_icache_cc_send_updt_tab_idx("r_icache_cc_send_updt_tab_idx"), |
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293 | |
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294 | r_dcache_fsm("r_dcache_fsm"), |
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295 | r_dcache_fsm_cc_save("r_dcache_fsm_cc_save"), |
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296 | r_dcache_fsm_scan_save("r_dcache_fsm_scan_save"), |
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297 | |
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298 | r_dcache_wbuf_req("r_dcache_wbuf_req"), |
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299 | r_dcache_updt_req("r_dcache_updt_req"), |
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300 | r_dcache_save_vaddr("r_dcache_save_vaddr"), |
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301 | r_dcache_save_wdata("r_dcache_save_wdata"), |
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302 | r_dcache_save_be("r_dcache_save_be"), |
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303 | r_dcache_save_paddr("r_dcache_save_paddr"), |
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304 | r_dcache_save_cache_way("r_dcache_save_cache_way"), |
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305 | r_dcache_save_cache_set("r_dcache_save_cache_set"), |
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306 | r_dcache_save_cache_word("r_dcache_save_cache_word"), |
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307 | |
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308 | r_dcache_dirty_paddr("r_dcache_dirty_paddr"), |
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309 | r_dcache_dirty_way("r_dcache_dirty_way"), |
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310 | r_dcache_dirty_set("r_dcache_dirty_set"), |
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311 | |
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312 | r_dcache_vci_paddr("r_dcache_vci_paddr"), |
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313 | r_dcache_vci_wdata("r_dcache_vci_wdata"), |
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314 | r_dcache_vci_miss_req("r_dcache_vci_miss_req"), |
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315 | r_dcache_vci_unc_req("r_dcache_vci_unc_req"), |
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316 | r_dcache_vci_unc_be("r_dcache_vci_unc_be"), |
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317 | r_dcache_vci_unc_write("r_dcache_vci_unc_write"), |
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318 | r_dcache_vci_cas_req("r_dcache_vci_cas_req"), |
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319 | r_dcache_vci_cas_old("r_dcache_vci_cas_old"), |
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320 | r_dcache_vci_cas_new("r_dcache_vci_cas_new"), |
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321 | r_dcache_vci_ll_req("r_dcache_vci_ll_req"), |
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322 | r_dcache_vci_sc_req("r_dcache_vci_sc_req"), |
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323 | r_dcache_vci_sc_data("r_dcache_vci_sc_data"), |
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324 | |
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325 | r_dcache_xtn_way("r_dcache_xtn_way"), |
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326 | r_dcache_xtn_set("r_dcache_xtn_set"), |
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327 | |
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328 | r_dcache_miss_type("r_dcache_miss_type"), |
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329 | r_dcache_miss_word("r_dcache_miss_word"), |
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330 | r_dcache_miss_way("r_dcache_miss_way"), |
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331 | r_dcache_miss_set("r_dcache_miss_set"), |
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332 | r_dcache_miss_inval("r_dcache_miss_inval"), |
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333 | r_dcache_miss_wdt_max("r_dcache_miss_wdt_max"), |
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334 | r_dcache_miss_wdt("r_dcache_miss_wdt"), |
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335 | |
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336 | r_dcache_cc_way("r_dcache_cc_way"), |
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337 | r_dcache_cc_set("r_dcache_cc_set"), |
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338 | r_dcache_cc_word("r_dcache_cc_word"), |
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339 | r_dcache_cc_need_write("r_dcache_cc_need_write"), |
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340 | |
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341 | r_dcache_flush_count("r_dcache_flush_count"), |
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342 | |
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343 | r_dcache_ll_rsp_count("r_dcache_ll_rsp_count"), |
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344 | |
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345 | r_dcache_tlb_vaddr("r_dcache_tlb_vaddr"), |
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346 | r_dcache_tlb_ins("r_dcache_tlb_ins"), |
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347 | r_dcache_tlb_pte_flags("r_dcache_tlb_pte_flags"), |
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348 | r_dcache_tlb_pte_ppn("r_dcache_tlb_pte_ppn"), |
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349 | r_dcache_tlb_cache_way("r_dcache_tlb_cache_way"), |
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350 | r_dcache_tlb_cache_set("r_dcache_tlb_cache_set"), |
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351 | r_dcache_tlb_cache_word("r_dcache_tlb_cache_word"), |
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352 | r_dcache_tlb_way("r_dcache_tlb_way"), |
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353 | r_dcache_tlb_set("r_dcache_tlb_set"), |
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354 | |
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355 | r_dcache_tlb_inval_line("r_dcache_tlb_inval_line"), |
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356 | r_dcache_tlb_inval_set("r_dcache_tlb_inval_set"), |
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357 | |
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358 | r_dcache_xtn_req("r_dcache_xtn_req"), |
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359 | r_dcache_xtn_opcode("r_dcache_xtn_opcode"), |
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360 | |
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361 | r_dcache_cleanup_victim_req("r_dcache_cleanup_victim_req"), |
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362 | r_dcache_cleanup_victim_nline("r_dcache_cleanup_victim_nline"), |
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363 | |
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364 | r_dcache_cc_send_req("r_dcache_cc_send_req"), |
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365 | r_dcache_cc_send_type("r_dcache_cc_send_type"), |
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366 | r_dcache_cc_send_nline("r_dcache_cc_send_nline"), |
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367 | r_dcache_cc_send_way("r_dcache_cc_send_way"), |
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368 | r_dcache_cc_send_updt_tab_idx("r_dcache_cc_send_updt_tab_idx"), |
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369 | |
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370 | r_vci_cmd_fsm("r_vci_cmd_fsm"), |
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371 | r_vci_cmd_min("r_vci_cmd_min"), |
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372 | r_vci_cmd_max("r_vci_cmd_max"), |
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373 | r_vci_cmd_cpt("r_vci_cmd_cpt"), |
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374 | r_vci_cmd_imiss_prio("r_vci_cmd_imiss_prio"), |
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375 | |
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376 | r_vci_rsp_fsm("r_vci_rsp_fsm"), |
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377 | r_vci_rsp_cpt("r_vci_rsp_cpt"), |
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378 | r_vci_rsp_ins_error("r_vci_rsp_ins_error"), |
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379 | r_vci_rsp_data_error("r_vci_rsp_data_error"), |
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380 | r_vci_rsp_fifo_icache("r_vci_rsp_fifo_icache", 2), // 2 words depth |
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381 | r_vci_rsp_fifo_dcache("r_vci_rsp_fifo_dcache", 2), // 2 words depth |
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382 | |
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383 | r_cc_send_fsm("r_cc_send_fsm"), |
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384 | r_cc_send_last_client("r_cc_send_last_client"), |
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385 | |
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386 | r_cc_receive_fsm("r_cc_receive_fsm"), |
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387 | r_cc_receive_data_ins("r_cc_receive_data_ins"), |
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388 | r_cc_receive_word_idx("r_cc_receive_word_idx"), |
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389 | r_cc_receive_updt_fifo_be("r_cc_receive_updt_fifo_be", 2), // 2 words depth |
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390 | r_cc_receive_updt_fifo_data("r_cc_receive_updt_fifo_data", 2), // 2 words depth |
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391 | r_cc_receive_updt_fifo_eop("r_cc_receive_updt_fifo_eop", 2), // 2 words depth |
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392 | |
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393 | r_cc_receive_icache_req("r_cc_receive_icache_req"), |
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394 | r_cc_receive_icache_type("r_cc_receive_icache_type"), |
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395 | r_cc_receive_icache_way("r_cc_receive_icache_way"), |
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396 | r_cc_receive_icache_set("r_cc_receive_icache_set"), |
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397 | r_cc_receive_icache_updt_tab_idx("r_cc_receive_icache_updt_tab_idx"), |
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398 | r_cc_receive_icache_nline("r_cc_receive_icache_nline"), |
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399 | |
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400 | r_cc_receive_dcache_req("r_cc_receive_dcache_req"), |
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401 | r_cc_receive_dcache_type("r_cc_receive_dcache_type"), |
---|
402 | r_cc_receive_dcache_way("r_cc_receive_dcache_way"), |
---|
403 | r_cc_receive_dcache_set("r_cc_receive_dcache_set"), |
---|
404 | r_cc_receive_dcache_updt_tab_idx("r_cc_receive_dcache_updt_tab_idx"), |
---|
405 | r_cc_receive_dcache_nline("r_cc_receive_dcache_nline"), |
---|
406 | |
---|
407 | r_iss(this->name(), proc_id), |
---|
408 | r_wbuf("wbuf", wbuf_nwords, wbuf_nlines, dcache_words ), |
---|
409 | r_icache("icache", icache_ways, icache_sets, icache_words), |
---|
410 | r_dcache("dcache", dcache_ways, dcache_sets, dcache_words), |
---|
411 | r_itlb("itlb", proc_id, itlb_ways,itlb_sets,vci_param::N), |
---|
412 | r_dtlb("dtlb", proc_id, dtlb_ways,dtlb_sets,vci_param::N) |
---|
413 | { |
---|
414 | std::cout << " - Building VciCcVcacheWrapper : " << name << std::endl; |
---|
415 | |
---|
416 | assert(((icache_words*vci_param::B) < (1 << vci_param::K)) and |
---|
417 | "Need more PLEN bits."); |
---|
418 | |
---|
419 | assert((vci_param::T > 2) and ((1 << (vci_param::T - 1)) >= (wbuf_nlines)) and |
---|
420 | "Need more TRDID bits."); |
---|
421 | |
---|
422 | assert((icache_words == dcache_words) and |
---|
423 | "icache_words and dcache_words parameters must be equal"); |
---|
424 | |
---|
425 | assert((itlb_sets == dtlb_sets) and |
---|
426 | "itlb_sets and dtlb_sets parameters must be etqual"); |
---|
427 | |
---|
428 | assert((itlb_ways == dtlb_ways) and |
---|
429 | "itlb_ways and dtlb_ways parameters must be etqual"); |
---|
430 | |
---|
431 | r_mmu_params = (uint32_log2(m_dtlb_ways) << 29) | (uint32_log2(m_dtlb_sets) << 25) | |
---|
432 | (uint32_log2(m_dcache_ways) << 22) | (uint32_log2(m_dcache_sets) << 18) | |
---|
433 | (uint32_log2(m_itlb_ways) << 15) | (uint32_log2(m_itlb_sets) << 11) | |
---|
434 | (uint32_log2(m_icache_ways) << 8) | (uint32_log2(m_icache_sets) << 4) | |
---|
435 | (uint32_log2(m_icache_words << 2)); |
---|
436 | |
---|
437 | r_mmu_release = (uint32_t) (1 << 16) | 0x1; |
---|
438 | |
---|
439 | r_dcache_in_tlb = new bool[dcache_ways * dcache_sets]; |
---|
440 | r_dcache_contains_ptd = new bool[dcache_ways * dcache_sets]; |
---|
441 | |
---|
442 | SC_METHOD(transition); |
---|
443 | dont_initialize(); |
---|
444 | sensitive << p_clk.pos(); |
---|
445 | |
---|
446 | SC_METHOD(genMoore); |
---|
447 | dont_initialize(); |
---|
448 | sensitive << p_clk.neg(); |
---|
449 | |
---|
450 | typename iss_t::CacheInfo cache_info; |
---|
451 | cache_info.has_mmu = true; |
---|
452 | cache_info.icache_line_size = icache_words * sizeof(uint32_t); |
---|
453 | cache_info.icache_assoc = icache_ways; |
---|
454 | cache_info.icache_n_lines = icache_sets; |
---|
455 | cache_info.dcache_line_size = dcache_words * sizeof(uint32_t); |
---|
456 | cache_info.dcache_assoc = dcache_ways; |
---|
457 | cache_info.dcache_n_lines = dcache_sets; |
---|
458 | r_iss.setCacheInfo(cache_info); |
---|
459 | } |
---|
460 | |
---|
461 | ///////////////////////////////////// |
---|
462 | tmpl(/**/)::~VciCcVCacheWrapper() |
---|
463 | ///////////////////////////////////// |
---|
464 | { |
---|
465 | delete [] r_dcache_in_tlb; |
---|
466 | delete [] r_dcache_contains_ptd; |
---|
467 | } |
---|
468 | |
---|
469 | //////////////////////// |
---|
470 | tmpl(void)::print_cpi() |
---|
471 | //////////////////////// |
---|
472 | { |
---|
473 | std::cout << name() << " CPI = " |
---|
474 | << (float)m_cpt_total_cycles/(m_cpt_total_cycles - m_cpt_frz_cycles) << std::endl ; |
---|
475 | } |
---|
476 | |
---|
477 | //////////////////////////////////// |
---|
478 | tmpl(void)::print_trace(size_t mode) |
---|
479 | //////////////////////////////////// |
---|
480 | { |
---|
481 | // b0 : write buffer trace |
---|
482 | // b1 : dump processor registers |
---|
483 | // b2 : dcache trace |
---|
484 | // b3 : icache trace |
---|
485 | // b4 : dtlb trace |
---|
486 | // b5 : itlb trace |
---|
487 | // b6 : SR (ISS register 32) |
---|
488 | |
---|
489 | std::cout << std::dec << "PROC " << name() << std::endl; |
---|
490 | |
---|
491 | std::cout << " " << m_ireq << std::endl; |
---|
492 | std::cout << " " << m_irsp << std::endl; |
---|
493 | std::cout << " " << m_dreq << std::endl; |
---|
494 | std::cout << " " << m_drsp << std::endl; |
---|
495 | |
---|
496 | std::cout << " " << icache_fsm_state_str[r_icache_fsm.read()] |
---|
497 | << " | " << dcache_fsm_state_str[r_dcache_fsm.read()] |
---|
498 | << " | " << cmd_fsm_state_str[r_vci_cmd_fsm.read()] |
---|
499 | << " | " << rsp_fsm_state_str[r_vci_rsp_fsm.read()] |
---|
500 | << " | " << cc_receive_fsm_state_str[r_cc_receive_fsm.read()] |
---|
501 | << " | " << cc_send_fsm_state_str[r_cc_send_fsm.read()] |
---|
502 | << " | MMU = " << r_mmu_mode.read(); |
---|
503 | |
---|
504 | if (r_dcache_updt_req.read()) std::cout << " | P1_UPDT"; |
---|
505 | if (r_dcache_wbuf_req.read()) std::cout << " | P1_WBUF"; |
---|
506 | std::cout << std::endl; |
---|
507 | |
---|
508 | if (mode & 0x01) |
---|
509 | { |
---|
510 | if (r_icache_miss_req.read()) std::cout << " IMISS_REQ" << std::endl; |
---|
511 | if (r_icache_unc_req.read()) std::cout << " IUNC_REQ" << std::endl; |
---|
512 | if (r_dcache_vci_miss_req.read()) std::cout << " DMISS_REQ" << std::endl; |
---|
513 | if (r_dcache_vci_unc_req.read()) std::cout << " DUNC_REQ" << std::endl; |
---|
514 | |
---|
515 | r_wbuf.printTrace((mode >> 1) & 1); |
---|
516 | } |
---|
517 | if (mode & 0x02) |
---|
518 | { |
---|
519 | r_iss.dump(); |
---|
520 | } |
---|
521 | if (mode & 0x04) |
---|
522 | { |
---|
523 | std::cout << " Data Cache" << std::endl; |
---|
524 | r_dcache.printTrace(); |
---|
525 | } |
---|
526 | if (mode & 0x08) |
---|
527 | { |
---|
528 | std::cout << " Instruction Cache" << std::endl; |
---|
529 | r_icache.printTrace(); |
---|
530 | } |
---|
531 | if (mode & 0x10) |
---|
532 | { |
---|
533 | std::cout << " Data TLB" << std::endl; |
---|
534 | r_dtlb.printTrace(); |
---|
535 | } |
---|
536 | if (mode & 0x20) |
---|
537 | { |
---|
538 | std::cout << " Instruction TLB" << std::endl; |
---|
539 | r_itlb.printTrace(); |
---|
540 | } |
---|
541 | if (mode & 0x40) |
---|
542 | { |
---|
543 | uint32_t status = r_iss.debugGetRegisterValue(32); |
---|
544 | std::cout << name(); |
---|
545 | if (status != m_previous_status ) std::cout << " NEW "; |
---|
546 | std::cout << " status = " << std::hex << status << " " << std::endl; |
---|
547 | m_previous_status = status; |
---|
548 | } |
---|
549 | } |
---|
550 | |
---|
551 | ////////////////////////////////////////// |
---|
552 | tmpl(void)::cache_monitor(paddr_t addr) |
---|
553 | ////////////////////////////////////////// |
---|
554 | { |
---|
555 | bool cache_hit; |
---|
556 | size_t cache_way = 0; |
---|
557 | size_t cache_set = 0; |
---|
558 | size_t cache_word = 0; |
---|
559 | uint32_t cache_rdata = 0; |
---|
560 | |
---|
561 | cache_hit = r_dcache.read_neutral(addr, |
---|
562 | &cache_rdata, |
---|
563 | &cache_way, |
---|
564 | &cache_set, |
---|
565 | &cache_word); |
---|
566 | |
---|
567 | if (cache_hit != m_debug_previous_d_hit) |
---|
568 | { |
---|
569 | std::cout << "Monitor PROC " << name() |
---|
570 | << " DCACHE at cycle " << std::dec << m_cpt_total_cycles |
---|
571 | << " / HIT = " << cache_hit |
---|
572 | << " / PADDR = " << std::hex << addr |
---|
573 | << " / DATA = " << cache_rdata |
---|
574 | << " / WAY = " << cache_way << std::endl; |
---|
575 | m_debug_previous_d_hit = cache_hit; |
---|
576 | } |
---|
577 | |
---|
578 | cache_hit = r_icache.read_neutral(addr, |
---|
579 | &cache_rdata, |
---|
580 | &cache_way, |
---|
581 | &cache_set, |
---|
582 | &cache_word); |
---|
583 | |
---|
584 | if (cache_hit != m_debug_previous_i_hit) |
---|
585 | { |
---|
586 | std::cout << "Monitor PROC " << name() |
---|
587 | << " ICACHE at cycle " << std::dec << m_cpt_total_cycles |
---|
588 | << " / HIT = " << cache_hit |
---|
589 | << " / PADDR = " << std::hex << addr |
---|
590 | << " / DATA = " << cache_rdata |
---|
591 | << " / WAY = " << cache_way << std::endl; |
---|
592 | m_debug_previous_i_hit = cache_hit; |
---|
593 | } |
---|
594 | } |
---|
595 | |
---|
596 | /* |
---|
597 | //////////////////////// |
---|
598 | tmpl(void)::print_stats() |
---|
599 | //////////////////////// |
---|
600 | { |
---|
601 | float run_cycles = (float)(m_cpt_total_cycles - m_cpt_frz_cycles); |
---|
602 | std::cout << name() << std::endl |
---|
603 | << "- CPI = " << (float)m_cpt_total_cycles/run_cycles << std::endl |
---|
604 | << "- READ RATE = " << (float)m_cpt_read/run_cycles << std::endl |
---|
605 | << "- WRITE RATE = " << (float)m_cpt_write/run_cycles << std::endl |
---|
606 | << "- IMISS_RATE = " << (float)m_cpt_ins_miss/m_cpt_ins_read << std::endl |
---|
607 | << "- DMISS RATE = " << (float)m_cpt_data_miss/(m_cpt_read-m_cpt_unc_read) << std::endl |
---|
608 | << "- INS MISS COST = " << (float)m_cost_ins_miss_frz/m_cpt_ins_miss << std::endl |
---|
609 | << "- DATA MISS COST = " << (float)m_cost_data_miss_frz/m_cpt_data_miss << std::endl |
---|
610 | << "- WRITE COST = " << (float)m_cost_write_frz/m_cpt_write << std::endl |
---|
611 | << "- UNC COST = " << (float)m_cost_unc_read_frz/m_cpt_unc_read << std::endl |
---|
612 | << "- UNCACHED READ RATE = " << (float)m_cpt_unc_read/m_cpt_read << std::endl |
---|
613 | << "- CACHED WRITE RATE = " << (float)m_cpt_write_cached/m_cpt_write << std::endl |
---|
614 | << "- INS TLB MISS RATE = " << (float)m_cpt_ins_tlb_miss/m_cpt_ins_tlb_read << std::endl |
---|
615 | << "- DATA TLB MISS RATE = " << (float)m_cpt_data_tlb_miss/m_cpt_data_tlb_read << std::endl |
---|
616 | << "- ITLB MISS COST = " << (float)m_cost_ins_tlb_miss_frz/m_cpt_ins_tlb_miss << std::endl |
---|
617 | << "- DTLB MISS COST = " << (float)m_cost_data_tlb_miss_frz/m_cpt_data_tlb_miss << std::endl |
---|
618 | << "- ITLB UPDATE ACC COST = " << (float)m_cost_ins_tlb_update_acc_frz/m_cpt_ins_tlb_update_acc << std::endl |
---|
619 | << "- DTLB UPDATE ACC COST = " << (float)m_cost_data_tlb_update_acc_frz/m_cpt_data_tlb_update_acc << std::endl |
---|
620 | << "- DTLB UPDATE DIRTY COST = " << (float)m_cost_data_tlb_update_dirty_frz/m_cpt_data_tlb_update_dirty << std::endl |
---|
621 | << "- ITLB HIT IN DCACHE RATE= " << (float)m_cpt_ins_tlb_hit_dcache/m_cpt_ins_tlb_miss << std::endl |
---|
622 | << "- DTLB HIT IN DCACHE RATE= " << (float)m_cpt_data_tlb_hit_dcache/m_cpt_data_tlb_miss << std::endl |
---|
623 | << "- DCACHE FROZEN BY ITLB = " << (float)m_cost_ins_tlb_occup_cache_frz/m_cpt_dcache_frz_cycles << std::endl |
---|
624 | << "- DCACHE FOR TLB % = " << (float)m_cpt_tlb_occup_dcache/(m_dcache_ways*m_dcache_sets) << std::endl |
---|
625 | << "- NB CC BROADCAST = " << m_cpt_cc_broadcast << std::endl |
---|
626 | << "- NB CC UPDATE DATA = " << m_cpt_cc_update_data << std::endl |
---|
627 | << "- NB CC INVAL DATA = " << m_cpt_cc_inval_data << std::endl |
---|
628 | << "- NB CC INVAL INS = " << m_cpt_cc_inval_ins << std::endl |
---|
629 | << "- CC BROADCAST COST = " << (float)m_cost_broadcast_frz/m_cpt_cc_broadcast << std::endl |
---|
630 | << "- CC UPDATE DATA COST = " << (float)m_cost_updt_data_frz/m_cpt_cc_update_data << std::endl |
---|
631 | << "- CC INVAL DATA COST = " << (float)m_cost_inval_data_frz/m_cpt_cc_inval_data << std::endl |
---|
632 | << "- CC INVAL INS COST = " << (float)m_cost_inval_ins_frz/m_cpt_cc_inval_ins << std::endl |
---|
633 | << "- NB CC CLEANUP DATA = " << m_cpt_cc_cleanup_data << std::endl |
---|
634 | << "- NB CC CLEANUP INS = " << m_cpt_cc_cleanup_ins << std::endl |
---|
635 | << "- IMISS TRANSACTION = " << (float)m_cost_imiss_transaction/m_cpt_imiss_transaction << std::endl |
---|
636 | << "- DMISS TRANSACTION = " << (float)m_cost_dmiss_transaction/m_cpt_dmiss_transaction << std::endl |
---|
637 | << "- UNC TRANSACTION = " << (float)m_cost_unc_transaction/m_cpt_unc_transaction << std::endl |
---|
638 | << "- WRITE TRANSACTION = " << (float)m_cost_write_transaction/m_cpt_write_transaction << std::endl |
---|
639 | << "- WRITE LENGTH = " << (float)m_length_write_transaction/m_cpt_write_transaction << std::endl |
---|
640 | << "- ITLB MISS TRANSACTION = " << (float)m_cost_itlbmiss_transaction/m_cpt_itlbmiss_transaction << std::endl |
---|
641 | << "- DTLB MISS TRANSACTION = " << (float)m_cost_dtlbmiss_transaction/m_cpt_dtlbmiss_transaction << std::endl; |
---|
642 | } |
---|
643 | |
---|
644 | //////////////////////// |
---|
645 | tmpl(void)::clear_stats() |
---|
646 | //////////////////////// |
---|
647 | { |
---|
648 | m_cpt_dcache_data_read = 0; |
---|
649 | m_cpt_dcache_data_write = 0; |
---|
650 | m_cpt_dcache_dir_read = 0; |
---|
651 | m_cpt_dcache_dir_write = 0; |
---|
652 | m_cpt_icache_data_read = 0; |
---|
653 | m_cpt_icache_data_write = 0; |
---|
654 | m_cpt_icache_dir_read = 0; |
---|
655 | m_cpt_icache_dir_write = 0; |
---|
656 | |
---|
657 | m_cpt_frz_cycles = 0; |
---|
658 | m_cpt_dcache_frz_cycles = 0; |
---|
659 | m_cpt_total_cycles = 0; |
---|
660 | |
---|
661 | m_cpt_read = 0; |
---|
662 | m_cpt_write = 0; |
---|
663 | m_cpt_data_miss = 0; |
---|
664 | m_cpt_ins_miss = 0; |
---|
665 | m_cpt_unc_read = 0; |
---|
666 | m_cpt_write_cached = 0; |
---|
667 | m_cpt_ins_read = 0; |
---|
668 | |
---|
669 | m_cost_write_frz = 0; |
---|
670 | m_cost_data_miss_frz = 0; |
---|
671 | m_cost_unc_read_frz = 0; |
---|
672 | m_cost_ins_miss_frz = 0; |
---|
673 | |
---|
674 | m_cpt_imiss_transaction = 0; |
---|
675 | m_cpt_dmiss_transaction = 0; |
---|
676 | m_cpt_unc_transaction = 0; |
---|
677 | m_cpt_write_transaction = 0; |
---|
678 | m_cpt_icache_unc_transaction = 0; |
---|
679 | |
---|
680 | m_cost_imiss_transaction = 0; |
---|
681 | m_cost_dmiss_transaction = 0; |
---|
682 | m_cost_unc_transaction = 0; |
---|
683 | m_cost_write_transaction = 0; |
---|
684 | m_cost_icache_unc_transaction = 0; |
---|
685 | m_length_write_transaction = 0; |
---|
686 | |
---|
687 | m_cpt_ins_tlb_read = 0; |
---|
688 | m_cpt_ins_tlb_miss = 0; |
---|
689 | m_cpt_ins_tlb_update_acc = 0; |
---|
690 | |
---|
691 | m_cpt_data_tlb_read = 0; |
---|
692 | m_cpt_data_tlb_miss = 0; |
---|
693 | m_cpt_data_tlb_update_acc = 0; |
---|
694 | m_cpt_data_tlb_update_dirty = 0; |
---|
695 | m_cpt_ins_tlb_hit_dcache = 0; |
---|
696 | m_cpt_data_tlb_hit_dcache = 0; |
---|
697 | m_cpt_ins_tlb_occup_cache = 0; |
---|
698 | m_cpt_data_tlb_occup_cache = 0; |
---|
699 | |
---|
700 | m_cost_ins_tlb_miss_frz = 0; |
---|
701 | m_cost_data_tlb_miss_frz = 0; |
---|
702 | m_cost_ins_tlb_update_acc_frz = 0; |
---|
703 | m_cost_data_tlb_update_acc_frz = 0; |
---|
704 | m_cost_data_tlb_update_dirty_frz = 0; |
---|
705 | m_cost_ins_tlb_occup_cache_frz = 0; |
---|
706 | m_cost_data_tlb_occup_cache_frz = 0; |
---|
707 | |
---|
708 | m_cpt_itlbmiss_transaction = 0; |
---|
709 | m_cpt_itlb_ll_transaction = 0; |
---|
710 | m_cpt_itlb_sc_transaction = 0; |
---|
711 | m_cpt_dtlbmiss_transaction = 0; |
---|
712 | m_cpt_dtlb_ll_transaction = 0; |
---|
713 | m_cpt_dtlb_sc_transaction = 0; |
---|
714 | m_cpt_dtlb_ll_dirty_transaction = 0; |
---|
715 | m_cpt_dtlb_sc_dirty_transaction = 0; |
---|
716 | |
---|
717 | m_cost_itlbmiss_transaction = 0; |
---|
718 | m_cost_itlb_ll_transaction = 0; |
---|
719 | m_cost_itlb_sc_transaction = 0; |
---|
720 | m_cost_dtlbmiss_transaction = 0; |
---|
721 | m_cost_dtlb_ll_transaction = 0; |
---|
722 | m_cost_dtlb_sc_transaction = 0; |
---|
723 | m_cost_dtlb_ll_dirty_transaction = 0; |
---|
724 | m_cost_dtlb_sc_dirty_transaction = 0; |
---|
725 | |
---|
726 | m_cpt_cc_update_data = 0; |
---|
727 | m_cpt_cc_inval_ins = 0; |
---|
728 | m_cpt_cc_inval_data = 0; |
---|
729 | m_cpt_cc_broadcast = 0; |
---|
730 | |
---|
731 | m_cost_updt_data_frz = 0; |
---|
732 | m_cost_inval_ins_frz = 0; |
---|
733 | m_cost_inval_data_frz = 0; |
---|
734 | m_cost_broadcast_frz = 0; |
---|
735 | |
---|
736 | m_cpt_cc_cleanup_data = 0; |
---|
737 | m_cpt_cc_cleanup_ins = 0; |
---|
738 | } |
---|
739 | |
---|
740 | */ |
---|
741 | |
---|
742 | ///////////////////////// |
---|
743 | tmpl(void)::transition() |
---|
744 | ///////////////////////// |
---|
745 | { |
---|
746 | if (not p_resetn.read()) |
---|
747 | { |
---|
748 | r_iss.reset(); |
---|
749 | r_wbuf.reset(); |
---|
750 | r_icache.reset(); |
---|
751 | r_dcache.reset(); |
---|
752 | r_itlb.reset(); |
---|
753 | r_dtlb.reset(); |
---|
754 | |
---|
755 | r_dcache_fsm = DCACHE_IDLE; |
---|
756 | r_icache_fsm = ICACHE_IDLE; |
---|
757 | r_vci_cmd_fsm = CMD_IDLE; |
---|
758 | r_vci_rsp_fsm = RSP_IDLE; |
---|
759 | r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
760 | r_cc_send_fsm = CC_SEND_IDLE; |
---|
761 | |
---|
762 | // reset data physical address extension |
---|
763 | r_dcache_paddr_ext = m_dcache_paddr_ext_reset; |
---|
764 | |
---|
765 | // reset inst physical address extension |
---|
766 | r_icache_paddr_ext = m_icache_paddr_ext_reset; |
---|
767 | |
---|
768 | // reset dcache directory extension |
---|
769 | for (size_t i = 0; i< m_dcache_ways * m_dcache_sets; i++) |
---|
770 | { |
---|
771 | r_dcache_in_tlb[i] = false; |
---|
772 | r_dcache_contains_ptd[i] = false; |
---|
773 | } |
---|
774 | |
---|
775 | // Response FIFOs and cleanup buffer |
---|
776 | r_vci_rsp_fifo_icache.init(); |
---|
777 | r_vci_rsp_fifo_dcache.init(); |
---|
778 | |
---|
779 | // ICACHE & DCACHE activated |
---|
780 | // ITLB & DTLB desactivated |
---|
781 | r_mmu_mode = 0x3; |
---|
782 | |
---|
783 | // No request from ICACHE FSM to CMD FSM |
---|
784 | r_icache_miss_req = false; |
---|
785 | r_icache_unc_req = false; |
---|
786 | |
---|
787 | // No request from ICACHE_FSM to DCACHE FSM |
---|
788 | r_icache_tlb_miss_req = false; |
---|
789 | |
---|
790 | // No request from ICACHE_FSM to CC_SEND FSM |
---|
791 | r_icache_cc_send_req = false; |
---|
792 | r_icache_cleanup_victim_req = false; |
---|
793 | |
---|
794 | r_icache_clack_req = false; |
---|
795 | |
---|
796 | // No pending write in pipeline |
---|
797 | r_dcache_wbuf_req = false; |
---|
798 | r_dcache_updt_req = false; |
---|
799 | |
---|
800 | // No request from DCACHE_FSM to CMD_FSM |
---|
801 | r_dcache_vci_miss_req = false; |
---|
802 | r_dcache_vci_unc_req = false; |
---|
803 | r_dcache_vci_cas_req = false; |
---|
804 | r_dcache_vci_ll_req = false; |
---|
805 | r_dcache_vci_sc_req = false; |
---|
806 | |
---|
807 | // No processor XTN request pending |
---|
808 | r_dcache_xtn_req = false; |
---|
809 | |
---|
810 | // No request from DCACHE FSM to CC_SEND FSM |
---|
811 | r_dcache_cc_send_req = false; |
---|
812 | r_dcache_cleanup_victim_req = false; |
---|
813 | |
---|
814 | r_dcache_clack_req = false; |
---|
815 | |
---|
816 | // Reset watchdog timer threshold to max value |
---|
817 | r_dcache_miss_wdt_max = UINT32_MAX; |
---|
818 | |
---|
819 | // No request from CC_RECEIVE FSM to ICACHE/DCACHE FSMs |
---|
820 | r_cc_receive_icache_req = false; |
---|
821 | r_cc_receive_dcache_req = false; |
---|
822 | |
---|
823 | // last cc_send client was dcache |
---|
824 | r_cc_send_last_client = false; |
---|
825 | |
---|
826 | // No pending cleanup after a replacement |
---|
827 | r_icache_miss_clack = false; |
---|
828 | r_dcache_miss_clack = false; |
---|
829 | |
---|
830 | // No signalisation of a coherence request matching a pending miss |
---|
831 | r_icache_miss_inval = false; |
---|
832 | r_dcache_miss_inval = false; |
---|
833 | |
---|
834 | r_dspin_clack_req = false; |
---|
835 | |
---|
836 | // No signalisation of errors |
---|
837 | r_vci_rsp_ins_error = false; |
---|
838 | r_vci_rsp_data_error = false; |
---|
839 | |
---|
840 | // Debug variables |
---|
841 | m_debug_previous_i_hit = false; |
---|
842 | m_debug_previous_d_hit = false; |
---|
843 | m_debug_icache_fsm = false; |
---|
844 | m_debug_dcache_fsm = false; |
---|
845 | m_debug_cmd_fsm = false; |
---|
846 | |
---|
847 | // activity counters |
---|
848 | m_cpt_dcache_data_read = 0; |
---|
849 | m_cpt_dcache_data_write = 0; |
---|
850 | m_cpt_dcache_dir_read = 0; |
---|
851 | m_cpt_dcache_dir_write = 0; |
---|
852 | m_cpt_icache_data_read = 0; |
---|
853 | m_cpt_icache_data_write = 0; |
---|
854 | m_cpt_icache_dir_read = 0; |
---|
855 | m_cpt_icache_dir_write = 0; |
---|
856 | |
---|
857 | m_cpt_frz_cycles = 0; |
---|
858 | m_cpt_total_cycles = 0; |
---|
859 | m_cpt_stop_simulation = 0; |
---|
860 | |
---|
861 | m_cpt_data_miss = 0; |
---|
862 | m_cpt_ins_miss = 0; |
---|
863 | m_cpt_unc_read = 0; |
---|
864 | m_cpt_write_cached = 0; |
---|
865 | m_cpt_ins_read = 0; |
---|
866 | |
---|
867 | m_cost_write_frz = 0; |
---|
868 | m_cost_data_miss_frz = 0; |
---|
869 | m_cost_unc_read_frz = 0; |
---|
870 | m_cost_ins_miss_frz = 0; |
---|
871 | |
---|
872 | m_cpt_imiss_transaction = 0; |
---|
873 | m_cpt_dmiss_transaction = 0; |
---|
874 | m_cpt_unc_transaction = 0; |
---|
875 | m_cpt_write_transaction = 0; |
---|
876 | m_cpt_icache_unc_transaction = 0; |
---|
877 | |
---|
878 | m_cost_imiss_transaction = 0; |
---|
879 | m_cost_dmiss_transaction = 0; |
---|
880 | m_cost_unc_transaction = 0; |
---|
881 | m_cost_write_transaction = 0; |
---|
882 | m_cost_icache_unc_transaction = 0; |
---|
883 | m_length_write_transaction = 0; |
---|
884 | |
---|
885 | m_cpt_ins_tlb_read = 0; |
---|
886 | m_cpt_ins_tlb_miss = 0; |
---|
887 | m_cpt_ins_tlb_update_acc = 0; |
---|
888 | |
---|
889 | m_cpt_data_tlb_read = 0; |
---|
890 | m_cpt_data_tlb_miss = 0; |
---|
891 | m_cpt_data_tlb_update_acc = 0; |
---|
892 | m_cpt_data_tlb_update_dirty = 0; |
---|
893 | m_cpt_ins_tlb_hit_dcache = 0; |
---|
894 | m_cpt_data_tlb_hit_dcache = 0; |
---|
895 | m_cpt_ins_tlb_occup_cache = 0; |
---|
896 | m_cpt_data_tlb_occup_cache = 0; |
---|
897 | |
---|
898 | m_cost_ins_tlb_miss_frz = 0; |
---|
899 | m_cost_data_tlb_miss_frz = 0; |
---|
900 | m_cost_ins_tlb_update_acc_frz = 0; |
---|
901 | m_cost_data_tlb_update_acc_frz = 0; |
---|
902 | m_cost_data_tlb_update_dirty_frz = 0; |
---|
903 | m_cost_ins_tlb_occup_cache_frz = 0; |
---|
904 | m_cost_data_tlb_occup_cache_frz = 0; |
---|
905 | |
---|
906 | m_cpt_ins_tlb_inval = 0; |
---|
907 | m_cpt_data_tlb_inval = 0; |
---|
908 | m_cost_ins_tlb_inval_frz = 0; |
---|
909 | m_cost_data_tlb_inval_frz = 0; |
---|
910 | |
---|
911 | m_cpt_cc_broadcast = 0; |
---|
912 | |
---|
913 | m_cost_updt_data_frz = 0; |
---|
914 | m_cost_inval_ins_frz = 0; |
---|
915 | m_cost_inval_data_frz = 0; |
---|
916 | m_cost_broadcast_frz = 0; |
---|
917 | |
---|
918 | m_cpt_cc_cleanup_data = 0; |
---|
919 | m_cpt_cc_cleanup_ins = 0; |
---|
920 | |
---|
921 | m_cpt_itlbmiss_transaction = 0; |
---|
922 | m_cpt_itlb_ll_transaction = 0; |
---|
923 | m_cpt_itlb_sc_transaction = 0; |
---|
924 | m_cpt_dtlbmiss_transaction = 0; |
---|
925 | m_cpt_dtlb_ll_transaction = 0; |
---|
926 | m_cpt_dtlb_sc_transaction = 0; |
---|
927 | m_cpt_dtlb_ll_dirty_transaction = 0; |
---|
928 | m_cpt_dtlb_sc_dirty_transaction = 0; |
---|
929 | |
---|
930 | m_cost_itlbmiss_transaction = 0; |
---|
931 | m_cost_itlb_ll_transaction = 0; |
---|
932 | m_cost_itlb_sc_transaction = 0; |
---|
933 | m_cost_dtlbmiss_transaction = 0; |
---|
934 | m_cost_dtlb_ll_transaction = 0; |
---|
935 | m_cost_dtlb_sc_transaction = 0; |
---|
936 | m_cost_dtlb_ll_dirty_transaction = 0; |
---|
937 | m_cost_dtlb_sc_dirty_transaction = 0; |
---|
938 | /* |
---|
939 | m_cpt_dcache_frz_cycles = 0; |
---|
940 | m_cpt_read = 0; |
---|
941 | m_cpt_write = 0; |
---|
942 | m_cpt_cc_update_data = 0; |
---|
943 | m_cpt_cc_inval_ins = 0; |
---|
944 | m_cpt_cc_inval_data = 0; |
---|
945 | */ |
---|
946 | |
---|
947 | for (uint32_t i = 0; i < 32; ++i) m_cpt_fsm_icache[i] = 0; |
---|
948 | for (uint32_t i = 0; i < 32; ++i) m_cpt_fsm_dcache[i] = 0; |
---|
949 | for (uint32_t i = 0; i < 32; ++i) m_cpt_fsm_cmd[i] = 0; |
---|
950 | for (uint32_t i = 0; i < 32; ++i) m_cpt_fsm_rsp[i] = 0; |
---|
951 | |
---|
952 | // init the llsc reservation buffer |
---|
953 | r_dcache_llsc_valid = false; |
---|
954 | m_monitor_ok = false; |
---|
955 | |
---|
956 | return; |
---|
957 | } |
---|
958 | |
---|
959 | // Response FIFOs default values |
---|
960 | bool vci_rsp_fifo_icache_get = false; |
---|
961 | bool vci_rsp_fifo_icache_put = false; |
---|
962 | uint32_t vci_rsp_fifo_icache_data = 0; |
---|
963 | |
---|
964 | bool vci_rsp_fifo_dcache_get = false; |
---|
965 | bool vci_rsp_fifo_dcache_put = false; |
---|
966 | uint32_t vci_rsp_fifo_dcache_data = 0; |
---|
967 | |
---|
968 | // updt fifo |
---|
969 | bool cc_receive_updt_fifo_get = false; |
---|
970 | bool cc_receive_updt_fifo_put = false; |
---|
971 | uint32_t cc_receive_updt_fifo_be = 0; |
---|
972 | uint32_t cc_receive_updt_fifo_data = 0; |
---|
973 | bool cc_receive_updt_fifo_eop = false; |
---|
974 | |
---|
975 | #ifdef INSTRUMENTATION |
---|
976 | m_cpt_fsm_dcache [r_dcache_fsm.read() ] ++; |
---|
977 | m_cpt_fsm_icache [r_icache_fsm.read() ] ++; |
---|
978 | m_cpt_fsm_cmd [r_vci_cmd_fsm.read()] ++; |
---|
979 | m_cpt_fsm_rsp [r_vci_rsp_fsm.read()] ++; |
---|
980 | m_cpt_fsm_tgt [r_tgt_fsm.read() ] ++; |
---|
981 | m_cpt_fsm_cleanup[r_cleanup_cmd_fsm.read()] ++; |
---|
982 | #endif |
---|
983 | |
---|
984 | m_cpt_total_cycles++; |
---|
985 | |
---|
986 | m_debug_icache_fsm = m_debug_icache_fsm || |
---|
987 | ((m_cpt_total_cycles > m_debug_start_cycle) and m_debug_ok); |
---|
988 | m_debug_dcache_fsm = m_debug_dcache_fsm || |
---|
989 | ((m_cpt_total_cycles > m_debug_start_cycle) and m_debug_ok); |
---|
990 | m_debug_cmd_fsm = m_debug_cmd_fsm || |
---|
991 | ((m_cpt_total_cycles > m_debug_start_cycle) and m_debug_ok); |
---|
992 | |
---|
993 | ///////////////////////////////////////////////////////////////////// |
---|
994 | // Get data and instruction requests from processor |
---|
995 | /////////////////////////////////////////////////////////////////////// |
---|
996 | |
---|
997 | r_iss.getRequests(m_ireq, m_dreq); |
---|
998 | |
---|
999 | //////////////////////////////////////////////////////////////////////////////////// |
---|
1000 | // ICACHE_FSM |
---|
1001 | // |
---|
1002 | // 1/ Coherence operations |
---|
1003 | // They are handled as interrupts generated by the CC_RECEIVE FSM. |
---|
1004 | // - There is a coherence request when r_tgt_icache_req is set. |
---|
1005 | // They are taken in IDLE, MISS_WAIT, MISS_DIR_UPDT, UNC_WAIT, states. |
---|
1006 | // - There is a cleanup ack request when r_cleanup_icache_req is set. |
---|
1007 | // They are taken in IDLE, MISS_SELECT, MISS_CLEAN, MISS_WAIT, |
---|
1008 | // MISS_DATA_UPDT, MISS_DIR_UPDT and UNC_WAIT states. |
---|
1009 | // - For both types of requests, actions associated to the pre-empted state |
---|
1010 | // are not executed. The DCACHE FSM goes to the proper sub-FSM (CC_CHECK |
---|
1011 | // or CC_CLACK) to execute the requested coherence operation, and returns |
---|
1012 | // to the pre-empted state. |
---|
1013 | // |
---|
1014 | // 2/ Processor requests |
---|
1015 | // They are taken in IDLE state only. In case of cache miss, or uncacheable |
---|
1016 | // instruction, the ICACHE FSM request a VCI transaction to CMD FSM, |
---|
1017 | // using the r_icache_miss_req or r_icache_unc_req flip-flops. These |
---|
1018 | // flip-flops are reset when the transaction starts. |
---|
1019 | // - In case of miss the ICACHE FSM goes to the ICACHE_MISS_SELECT state |
---|
1020 | // to select a slot and possibly request a cleanup transaction to the CC_SEND FSM. |
---|
1021 | // It goes next to the ICACHE_MISS_WAIT state waiting a response from RSP FSM, |
---|
1022 | // The availability of the missing cache line is signaled by the response fifo, |
---|
1023 | // and the cache update is done (one word per cycle) in the ICACHE_MISS_DATA_UPDT |
---|
1024 | // and ICACHE_MISS_DIR_UPDT states. |
---|
1025 | // - In case of uncacheable instruction, the ICACHE FSM goes to ICACHE_UNC_WAIT |
---|
1026 | // to wait the response from the RSP FSM, through the response fifo. |
---|
1027 | // The missing instruction is directly returned to processor in this state. |
---|
1028 | // |
---|
1029 | // 3/ TLB miss |
---|
1030 | // In case of tlb miss, the ICACHE FSM request to the DCACHE FSM to update the |
---|
1031 | // ITLB using the r_icache_tlb_miss_req flip-flop and the r_icache_tlb_miss_vaddr |
---|
1032 | // register, and goes to the ICACHE_TLB_WAIT state. |
---|
1033 | // The tlb update is entirely done by the DCACHE FSM (who becomes the owner |
---|
1034 | // of ITLB until the update is completed, and reset r_icache_tlb_miss_req |
---|
1035 | // to signal the completion. |
---|
1036 | // |
---|
1037 | // 4/ XTN requests |
---|
1038 | // The DCACHE FSM signals XTN processor requests to ICACHE_FSM |
---|
1039 | // using the r_dcache_xtn_req flip-flop. |
---|
1040 | // The request opcode and the address to be invalidated are transmitted |
---|
1041 | // in the r_dcache_xtn_opcode and r_dcache_save_wdata registers respectively. |
---|
1042 | // The r_dcache_xtn_req flip-flop is reset by the ICACHE_FSM when the operation |
---|
1043 | // is completed. |
---|
1044 | // |
---|
1045 | // 5/ Error Handling |
---|
1046 | // The r_vci_rsp_ins_error flip-flop is set by the RSP FSM in case of bus error |
---|
1047 | // in a cache miss or uncacheable read VCI transaction. Nothing is written |
---|
1048 | // in the response fifo. This flip-flop is reset by the ICACHE-FSM. |
---|
1049 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
1050 | |
---|
1051 | // default value for m_irsp |
---|
1052 | m_irsp.valid = false; |
---|
1053 | m_irsp.error = false; |
---|
1054 | m_irsp.instruction = 0; |
---|
1055 | |
---|
1056 | switch (r_icache_fsm.read()) |
---|
1057 | { |
---|
1058 | ///////////////// |
---|
1059 | case ICACHE_IDLE: // In this state, we handle processor requests, XTN requests, |
---|
1060 | // and coherence requests with a fixed priority: |
---|
1061 | // 1/ Coherence requests => ICACHE_CC_CHECK |
---|
1062 | // 2/ XTN processor requests (from DCACHE FSM) => ICACHE_XTN_* |
---|
1063 | // 3/ tlb miss => ICACHE_TLB_WAIT |
---|
1064 | // 4/ cacheable read miss => ICACHE_MISS_SELECT |
---|
1065 | // 5/ uncacheable read miss => ICACHE_UNC_REQ |
---|
1066 | { |
---|
1067 | // coherence clack interrupt |
---|
1068 | if (r_icache_clack_req.read()) |
---|
1069 | { |
---|
1070 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1071 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1072 | break; |
---|
1073 | } |
---|
1074 | |
---|
1075 | // coherence interrupt |
---|
1076 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read()) |
---|
1077 | { |
---|
1078 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1079 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1080 | break; |
---|
1081 | } |
---|
1082 | |
---|
1083 | // XTN requests sent by DCACHE FSM |
---|
1084 | // These request are not executed in this IDLE state (except XTN_INST_PADDR_EXT), |
---|
1085 | // because they require access to icache or itlb, that are already accessed |
---|
1086 | if (r_dcache_xtn_req.read()) |
---|
1087 | { |
---|
1088 | if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_PTPR ) |
---|
1089 | { |
---|
1090 | r_icache_fsm = ICACHE_XTN_TLB_FLUSH; |
---|
1091 | } |
---|
1092 | else if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_ICACHE_FLUSH) |
---|
1093 | { |
---|
1094 | r_icache_flush_count = 0; |
---|
1095 | r_icache_fsm = ICACHE_XTN_CACHE_FLUSH; |
---|
1096 | } |
---|
1097 | else if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_ITLB_INVAL) |
---|
1098 | { |
---|
1099 | r_icache_fsm = ICACHE_XTN_TLB_INVAL; |
---|
1100 | } |
---|
1101 | else if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_ICACHE_INVAL) |
---|
1102 | { |
---|
1103 | r_icache_fsm = ICACHE_XTN_CACHE_INVAL_VA; |
---|
1104 | } |
---|
1105 | else if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_MMU_ICACHE_PA_INV) |
---|
1106 | { |
---|
1107 | if (sizeof(paddr_t) <= 32) |
---|
1108 | { |
---|
1109 | assert(r_mmu_word_hi.read() == 0 && |
---|
1110 | "illegal XTN request in ICACHE: high bits should be 0 for 32bit paddr"); |
---|
1111 | r_icache_vci_paddr = (paddr_t) r_mmu_word_lo.read(); |
---|
1112 | } |
---|
1113 | else |
---|
1114 | { |
---|
1115 | r_icache_vci_paddr = (paddr_t) r_mmu_word_hi.read() << 32 | |
---|
1116 | (paddr_t) r_mmu_word_lo.read(); |
---|
1117 | } |
---|
1118 | r_icache_fsm = ICACHE_XTN_CACHE_INVAL_PA; |
---|
1119 | } |
---|
1120 | else if ((int) r_dcache_xtn_opcode.read() == (int) iss_t::XTN_INST_PADDR_EXT) |
---|
1121 | { |
---|
1122 | r_icache_paddr_ext = r_dcache_save_wdata.read(); |
---|
1123 | r_dcache_xtn_req = false; |
---|
1124 | } |
---|
1125 | else |
---|
1126 | { |
---|
1127 | assert(false and |
---|
1128 | "undefined XTN request received by ICACHE FSM"); |
---|
1129 | } |
---|
1130 | break; |
---|
1131 | } // end if xtn_req |
---|
1132 | |
---|
1133 | // processor request |
---|
1134 | if (m_ireq.valid ) |
---|
1135 | { |
---|
1136 | bool cacheable; |
---|
1137 | paddr_t paddr; |
---|
1138 | bool tlb_hit = false; |
---|
1139 | pte_info_t tlb_flags; |
---|
1140 | size_t tlb_way; |
---|
1141 | size_t tlb_set; |
---|
1142 | paddr_t tlb_nline; |
---|
1143 | uint32_t cache_inst = 0; |
---|
1144 | size_t cache_way; |
---|
1145 | size_t cache_set; |
---|
1146 | size_t cache_word; |
---|
1147 | int cache_state = CACHE_SLOT_STATE_EMPTY; |
---|
1148 | |
---|
1149 | // We register processor request |
---|
1150 | r_icache_vaddr_save = m_ireq.addr; |
---|
1151 | paddr = (paddr_t) m_ireq.addr; |
---|
1152 | |
---|
1153 | // sytematic itlb access (if activated) |
---|
1154 | if (r_mmu_mode.read() & INS_TLB_MASK) |
---|
1155 | { |
---|
1156 | |
---|
1157 | #ifdef INSTRUMENTATION |
---|
1158 | m_cpt_itlb_read++; |
---|
1159 | #endif |
---|
1160 | tlb_hit = r_itlb.translate(m_ireq.addr, |
---|
1161 | &paddr, |
---|
1162 | &tlb_flags, |
---|
1163 | &tlb_nline, // unused |
---|
1164 | &tlb_way, // unused |
---|
1165 | &tlb_set); // unused |
---|
1166 | } |
---|
1167 | else if (vci_param::N > 32) |
---|
1168 | { |
---|
1169 | paddr = paddr | ((paddr_t) r_icache_paddr_ext.read() << 32); |
---|
1170 | } |
---|
1171 | |
---|
1172 | // systematic icache access (if activated) |
---|
1173 | if (r_mmu_mode.read() & INS_CACHE_MASK) |
---|
1174 | { |
---|
1175 | |
---|
1176 | |
---|
1177 | #ifdef INSTRUMENTATION |
---|
1178 | m_cpt_icache_data_read++; |
---|
1179 | m_cpt_icache_dir_read++; |
---|
1180 | #endif |
---|
1181 | r_icache.read(paddr, |
---|
1182 | &cache_inst, |
---|
1183 | &cache_way, |
---|
1184 | &cache_set, |
---|
1185 | &cache_word, |
---|
1186 | &cache_state); |
---|
1187 | } |
---|
1188 | |
---|
1189 | // We compute cacheability and check access rights: |
---|
1190 | // - If MMU activated : cacheability is defined by the C bit in the PTE, |
---|
1191 | // and the access rights are defined by the U and X bits in the PTE. |
---|
1192 | // - If MMU not activated : cacheability is defined by the segment table, |
---|
1193 | // and there is no access rights checking |
---|
1194 | |
---|
1195 | if (not (r_mmu_mode.read() & INS_TLB_MASK)) // tlb not activated: |
---|
1196 | { |
---|
1197 | // cacheability |
---|
1198 | if (not (r_mmu_mode.read() & INS_CACHE_MASK)) cacheable = false; |
---|
1199 | else cacheable = m_cacheability_table[(uint64_t) m_ireq.addr]; |
---|
1200 | } |
---|
1201 | else // itlb activated |
---|
1202 | { |
---|
1203 | if (tlb_hit) // ITLB hit |
---|
1204 | { |
---|
1205 | // cacheability |
---|
1206 | if (not (r_mmu_mode.read() & INS_CACHE_MASK)) cacheable = false; |
---|
1207 | else cacheable = tlb_flags.c; |
---|
1208 | |
---|
1209 | // access rights checking |
---|
1210 | if (not tlb_flags.u && (m_ireq.mode == iss_t::MODE_USER)) |
---|
1211 | { |
---|
1212 | |
---|
1213 | #if DEBUG_ICACHE |
---|
1214 | if ( m_debug_icache_fsm ) |
---|
1215 | std::cout << " <PROC " << name() << " ICACHE_IDLE> MMU Privilege Violation" |
---|
1216 | << " : PADDR = " << std::hex << paddr << std::endl; |
---|
1217 | #endif |
---|
1218 | r_mmu_ietr = MMU_READ_PRIVILEGE_VIOLATION; |
---|
1219 | r_mmu_ibvar = m_ireq.addr; |
---|
1220 | m_irsp.valid = true; |
---|
1221 | m_irsp.error = true; |
---|
1222 | m_irsp.instruction = 0; |
---|
1223 | break; |
---|
1224 | } |
---|
1225 | else if (not tlb_flags.x) |
---|
1226 | { |
---|
1227 | |
---|
1228 | #if DEBUG_ICACHE |
---|
1229 | if ( m_debug_icache_fsm ) |
---|
1230 | std::cout << " <PROC " << name() << " ICACHE_IDLE> MMU Executable Violation" |
---|
1231 | << " : PADDR = " << std::hex << paddr << std::endl; |
---|
1232 | #endif |
---|
1233 | r_mmu_ietr = MMU_READ_EXEC_VIOLATION; |
---|
1234 | r_mmu_ibvar = m_ireq.addr; |
---|
1235 | m_irsp.valid = true; |
---|
1236 | m_irsp.error = true; |
---|
1237 | m_irsp.instruction = 0; |
---|
1238 | break; |
---|
1239 | } |
---|
1240 | } |
---|
1241 | else // ITLB miss |
---|
1242 | { |
---|
1243 | |
---|
1244 | #ifdef INSTRUMENTATION |
---|
1245 | m_cpt_itlb_miss++; |
---|
1246 | #endif |
---|
1247 | r_icache_fsm = ICACHE_TLB_WAIT; |
---|
1248 | r_icache_tlb_miss_req = true; |
---|
1249 | break; |
---|
1250 | } |
---|
1251 | } // end if itlb activated |
---|
1252 | |
---|
1253 | // physical address registration |
---|
1254 | r_icache_vci_paddr = paddr; |
---|
1255 | |
---|
1256 | // Finally, we send the response to processor, and compute next state |
---|
1257 | if (cacheable) |
---|
1258 | { |
---|
1259 | if (cache_state == CACHE_SLOT_STATE_EMPTY) // cache miss |
---|
1260 | { |
---|
1261 | |
---|
1262 | #ifdef INSTRUMENTATION |
---|
1263 | m_cpt_icache_miss++; |
---|
1264 | #endif |
---|
1265 | // we request a VCI transaction |
---|
1266 | r_icache_fsm = ICACHE_MISS_SELECT; |
---|
1267 | #if DEBUG_ICACHE |
---|
1268 | if (m_debug_icache_fsm) |
---|
1269 | std::cout << " <PROC " << name() << " ICACHE_IDLE> READ MISS in icache" |
---|
1270 | << " : PADDR = " << std::hex << paddr << std::endl; |
---|
1271 | #endif |
---|
1272 | r_icache_miss_req = true; |
---|
1273 | } |
---|
1274 | else if (cache_state == CACHE_SLOT_STATE_ZOMBI ) // pending cleanup |
---|
1275 | { |
---|
1276 | // stalled until cleanup is acknowledged |
---|
1277 | r_icache_fsm = ICACHE_IDLE; |
---|
1278 | } |
---|
1279 | else // cache hit |
---|
1280 | { |
---|
1281 | |
---|
1282 | #ifdef INSTRUMENTATION |
---|
1283 | m_cpt_ins_read++; |
---|
1284 | #endif |
---|
1285 | // return instruction to processor |
---|
1286 | m_irsp.valid = true; |
---|
1287 | m_irsp.instruction = cache_inst; |
---|
1288 | r_icache_fsm = ICACHE_IDLE; |
---|
1289 | #if DEBUG_ICACHE |
---|
1290 | if (m_debug_icache_fsm) |
---|
1291 | std::cout << " <PROC " << name() << " ICACHE_IDLE> READ HIT in icache" |
---|
1292 | << " : PADDR = " << std::hex << paddr |
---|
1293 | << " / INST = " << cache_inst << std::endl; |
---|
1294 | #endif |
---|
1295 | } |
---|
1296 | } |
---|
1297 | else // non cacheable read |
---|
1298 | { |
---|
1299 | r_icache_unc_req = true; |
---|
1300 | r_icache_fsm = ICACHE_UNC_WAIT; |
---|
1301 | |
---|
1302 | #if DEBUG_ICACHE |
---|
1303 | if (m_debug_icache_fsm) |
---|
1304 | { |
---|
1305 | std::cout << " <PROC " << name() |
---|
1306 | << " ICACHE_IDLE> READ UNCACHEABLE in icache" |
---|
1307 | << " : PADDR = " << std::hex << paddr << std::endl; |
---|
1308 | } |
---|
1309 | #endif |
---|
1310 | } |
---|
1311 | } // end if m_ireq.valid |
---|
1312 | break; |
---|
1313 | } |
---|
1314 | ///////////////////// |
---|
1315 | case ICACHE_TLB_WAIT: // Waiting the itlb update by the DCACHE FSM after a tlb miss |
---|
1316 | // the itlb is udated by the DCACHE FSM, as well as the |
---|
1317 | // r_mmu_ietr and r_mmu_ibvar registers in case of error. |
---|
1318 | // the itlb is not accessed by ICACHE FSM until DCACHE FSM |
---|
1319 | // reset the r_icache_tlb_miss_req flip-flop |
---|
1320 | // external coherence request are accepted in this state. |
---|
1321 | { |
---|
1322 | // coherence clack interrupt |
---|
1323 | if (r_icache_clack_req.read()) |
---|
1324 | { |
---|
1325 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1326 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1327 | break; |
---|
1328 | } |
---|
1329 | |
---|
1330 | // coherence interrupt |
---|
1331 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read()) |
---|
1332 | { |
---|
1333 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1334 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1335 | break; |
---|
1336 | } |
---|
1337 | |
---|
1338 | if (m_ireq.valid) m_cost_ins_tlb_miss_frz++; |
---|
1339 | |
---|
1340 | // DCACHE FSM signals response by reseting the request flip-flop |
---|
1341 | if (not r_icache_tlb_miss_req.read()) |
---|
1342 | { |
---|
1343 | if (r_icache_tlb_rsp_error.read()) // error reported : tlb not updated |
---|
1344 | { |
---|
1345 | r_icache_tlb_rsp_error = false; |
---|
1346 | m_irsp.error = true; |
---|
1347 | m_irsp.valid = true; |
---|
1348 | r_icache_fsm = ICACHE_IDLE; |
---|
1349 | } |
---|
1350 | else // tlb updated : return to IDLE state |
---|
1351 | { |
---|
1352 | r_icache_fsm = ICACHE_IDLE; |
---|
1353 | } |
---|
1354 | } |
---|
1355 | break; |
---|
1356 | } |
---|
1357 | ////////////////////////// |
---|
1358 | case ICACHE_XTN_TLB_FLUSH: // invalidate in one cycle all non global TLB entries |
---|
1359 | { |
---|
1360 | r_itlb.flush(); |
---|
1361 | r_dcache_xtn_req = false; |
---|
1362 | r_icache_fsm = ICACHE_IDLE; |
---|
1363 | break; |
---|
1364 | } |
---|
1365 | //////////////////////////// |
---|
1366 | case ICACHE_XTN_CACHE_FLUSH: // Invalidate sequencially all cache lines, using |
---|
1367 | // r_icache_flush_count as a slot counter, |
---|
1368 | // looping in this state until all slots are visited. |
---|
1369 | // It can require two cycles per slot: |
---|
1370 | // We test here the slot state, and make the actual inval |
---|
1371 | // (if line is valid) in ICACHE_XTN_CACHE_FLUSH_GO state. |
---|
1372 | // A cleanup request is generated for each valid line |
---|
1373 | { |
---|
1374 | // coherence clack interrupt |
---|
1375 | if (r_icache_clack_req.read()) |
---|
1376 | { |
---|
1377 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1378 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1379 | break; |
---|
1380 | } |
---|
1381 | |
---|
1382 | // coherence request (from CC_RECEIVE FSM) |
---|
1383 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read()) |
---|
1384 | { |
---|
1385 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1386 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1387 | break; |
---|
1388 | } |
---|
1389 | |
---|
1390 | if (not r_icache_cc_send_req.read()) // blocked until previous cc_send request is sent |
---|
1391 | { |
---|
1392 | int state; |
---|
1393 | paddr_t tag; |
---|
1394 | size_t way = r_icache_flush_count.read() / m_icache_sets; |
---|
1395 | size_t set = r_icache_flush_count.read() % m_icache_sets; |
---|
1396 | |
---|
1397 | #ifdef INSTRUMENTATION |
---|
1398 | m_cpt_icache_dir_read++; |
---|
1399 | #endif |
---|
1400 | r_icache.read_dir(way, |
---|
1401 | set, |
---|
1402 | &tag, |
---|
1403 | &state); |
---|
1404 | |
---|
1405 | if (state == CACHE_SLOT_STATE_VALID) // inval required |
---|
1406 | { |
---|
1407 | // request cleanup |
---|
1408 | r_icache_cc_send_req = true; |
---|
1409 | r_icache_cc_send_nline = tag * m_icache_sets + set; |
---|
1410 | r_icache_cc_send_way = way; |
---|
1411 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1412 | |
---|
1413 | // goes to ICACHE_XTN_CACHE_FLUSH_GO to make inval |
---|
1414 | r_icache_miss_way = way; |
---|
1415 | r_icache_miss_set = set; |
---|
1416 | r_icache_fsm = ICACHE_XTN_CACHE_FLUSH_GO; |
---|
1417 | } |
---|
1418 | else if (r_icache_flush_count.read() == |
---|
1419 | (m_icache_sets*m_icache_ways - 1)) // last slot |
---|
1420 | { |
---|
1421 | r_dcache_xtn_req = false; |
---|
1422 | m_drsp.valid = true; |
---|
1423 | r_icache_fsm = ICACHE_IDLE; |
---|
1424 | } |
---|
1425 | |
---|
1426 | // saturation counter, to have the same last slot condition |
---|
1427 | // in ICACHE_XTN_CACHE_FLUSH and ICACHE_XTN_CACHE_FLUSH_GO states |
---|
1428 | if (r_icache_flush_count.read() < (m_icache_sets * m_icache_ways - 1)) |
---|
1429 | { |
---|
1430 | r_icache_flush_count = r_icache_flush_count.read() + 1; |
---|
1431 | } |
---|
1432 | } |
---|
1433 | break; |
---|
1434 | } |
---|
1435 | /////////////////////////////// |
---|
1436 | case ICACHE_XTN_CACHE_FLUSH_GO: // Switch slot state to ZOMBI for an XTN flush |
---|
1437 | { |
---|
1438 | size_t way = r_icache_miss_way.read(); |
---|
1439 | size_t set = r_icache_miss_set.read(); |
---|
1440 | |
---|
1441 | #ifdef INSTRUMENTATION |
---|
1442 | m_cpt_icache_dir_write++; |
---|
1443 | #endif |
---|
1444 | |
---|
1445 | r_icache.write_dir(way, |
---|
1446 | set, |
---|
1447 | CACHE_SLOT_STATE_ZOMBI); |
---|
1448 | |
---|
1449 | if (r_icache_flush_count.read() == |
---|
1450 | (m_icache_sets*m_icache_ways - 1)) // last slot |
---|
1451 | { |
---|
1452 | r_dcache_xtn_req = false; |
---|
1453 | m_drsp.valid = true; |
---|
1454 | r_icache_fsm = ICACHE_IDLE; |
---|
1455 | } |
---|
1456 | else |
---|
1457 | { |
---|
1458 | r_icache_fsm = ICACHE_XTN_CACHE_FLUSH; |
---|
1459 | } |
---|
1460 | break; |
---|
1461 | } |
---|
1462 | |
---|
1463 | ////////////////////////// |
---|
1464 | case ICACHE_XTN_TLB_INVAL: // invalidate one TLB entry selected by the virtual address |
---|
1465 | // stored in the r_dcache_save_wdata register |
---|
1466 | { |
---|
1467 | r_itlb.inval(r_dcache_save_wdata.read()); |
---|
1468 | r_dcache_xtn_req = false; |
---|
1469 | r_icache_fsm = ICACHE_IDLE; |
---|
1470 | break; |
---|
1471 | } |
---|
1472 | /////////////////////////////// |
---|
1473 | case ICACHE_XTN_CACHE_INVAL_VA: // Selective cache line invalidate with virtual address |
---|
1474 | // requires 3 cycles (in case of hit on itlb and icache). |
---|
1475 | // In this state, access TLB to translate virtual address |
---|
1476 | // stored in the r_dcache_save_wdata register. |
---|
1477 | { |
---|
1478 | paddr_t paddr; |
---|
1479 | bool hit; |
---|
1480 | |
---|
1481 | // read physical address in TLB when MMU activated |
---|
1482 | if (r_mmu_mode.read() & INS_TLB_MASK) // itlb activated |
---|
1483 | { |
---|
1484 | |
---|
1485 | #ifdef INSTRUMENTATION |
---|
1486 | m_cpt_itlb_read++; |
---|
1487 | #endif |
---|
1488 | hit = r_itlb.translate(r_dcache_save_wdata.read(), &paddr); |
---|
1489 | } |
---|
1490 | else // itlb not activated |
---|
1491 | { |
---|
1492 | paddr = (paddr_t) r_dcache_save_wdata.read(); |
---|
1493 | hit = true; |
---|
1494 | } |
---|
1495 | |
---|
1496 | if (hit) // continue the selective inval process |
---|
1497 | { |
---|
1498 | r_icache_vci_paddr = paddr; |
---|
1499 | r_icache_fsm = ICACHE_XTN_CACHE_INVAL_PA; |
---|
1500 | } |
---|
1501 | else // miss : send a request to DCACHE FSM |
---|
1502 | { |
---|
1503 | |
---|
1504 | #ifdef INSTRUMENTATION |
---|
1505 | m_cpt_itlb_miss++; |
---|
1506 | #endif |
---|
1507 | r_icache_tlb_miss_req = true; |
---|
1508 | r_icache_vaddr_save = r_dcache_save_wdata.read(); |
---|
1509 | r_icache_fsm = ICACHE_TLB_WAIT; |
---|
1510 | } |
---|
1511 | break; |
---|
1512 | } |
---|
1513 | /////////////////////////////// |
---|
1514 | case ICACHE_XTN_CACHE_INVAL_PA: // selective invalidate cache line with physical address |
---|
1515 | // require 2 cycles. In this state, we read directory |
---|
1516 | // with address stored in r_icache_vci_paddr register. |
---|
1517 | { |
---|
1518 | int state; |
---|
1519 | size_t way; |
---|
1520 | size_t set; |
---|
1521 | size_t word; |
---|
1522 | |
---|
1523 | #ifdef INSTRUMENTATION |
---|
1524 | m_cpt_icache_dir_read++; |
---|
1525 | #endif |
---|
1526 | r_icache.read_dir(r_icache_vci_paddr.read(), |
---|
1527 | &state, |
---|
1528 | &way, |
---|
1529 | &set, |
---|
1530 | &word); |
---|
1531 | |
---|
1532 | if (state == CACHE_SLOT_STATE_VALID) // inval to be done |
---|
1533 | { |
---|
1534 | r_icache_miss_way = way; |
---|
1535 | r_icache_miss_set = set; |
---|
1536 | r_icache_fsm = ICACHE_XTN_CACHE_INVAL_GO; |
---|
1537 | } |
---|
1538 | else // miss : acknowlege the XTN request and return |
---|
1539 | { |
---|
1540 | r_dcache_xtn_req = false; |
---|
1541 | r_icache_fsm = ICACHE_IDLE; |
---|
1542 | } |
---|
1543 | break; |
---|
1544 | } |
---|
1545 | /////////////////////////////// |
---|
1546 | case ICACHE_XTN_CACHE_INVAL_GO: // Switch slot to ZOMBI state for an XTN inval |
---|
1547 | { |
---|
1548 | if (not r_icache_cc_send_req.read()) // blocked until previous cc_send request not sent |
---|
1549 | { |
---|
1550 | |
---|
1551 | #ifdef INSTRUMENTATION |
---|
1552 | m_cpt_icache_dir_write++; |
---|
1553 | #endif |
---|
1554 | r_icache.write_dir(r_icache_miss_way.read(), |
---|
1555 | r_icache_miss_set.read(), |
---|
1556 | CACHE_SLOT_STATE_ZOMBI); |
---|
1557 | |
---|
1558 | // request cleanup |
---|
1559 | r_icache_cc_send_req = true; |
---|
1560 | r_icache_cc_send_nline = r_icache_vci_paddr.read() / (m_icache_words << 2); |
---|
1561 | r_icache_cc_send_way = r_icache_miss_way.read(); |
---|
1562 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1563 | |
---|
1564 | // acknowledge the XTN request and return |
---|
1565 | r_dcache_xtn_req = false; |
---|
1566 | r_icache_fsm = ICACHE_IDLE; |
---|
1567 | } |
---|
1568 | break; |
---|
1569 | } |
---|
1570 | //////////////////////// |
---|
1571 | case ICACHE_MISS_SELECT: // Try to select a slot in associative set, |
---|
1572 | // Waiting in this state if no slot available. |
---|
1573 | // If a victim slot has been choosen and the r_icache_cc_send_req is false, |
---|
1574 | // we send the cleanup request in this state. |
---|
1575 | // If not, a r_icache_cleanup_victim_req flip-flop is |
---|
1576 | // utilized for saving this cleanup request, and it will be sent later |
---|
1577 | // in state ICACHE_MISS_WAIT or ICACHE_MISS_UPDT_DIR. |
---|
1578 | // The r_icache_miss_clack flip-flop is set |
---|
1579 | // when a cleanup is required |
---|
1580 | { |
---|
1581 | if (m_ireq.valid) m_cost_ins_miss_frz++; |
---|
1582 | |
---|
1583 | // coherence clack interrupt |
---|
1584 | if (r_icache_clack_req.read()) |
---|
1585 | { |
---|
1586 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1587 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1588 | break; |
---|
1589 | } |
---|
1590 | |
---|
1591 | // coherence interrupt |
---|
1592 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read()) |
---|
1593 | { |
---|
1594 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1595 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1596 | break; |
---|
1597 | } |
---|
1598 | |
---|
1599 | |
---|
1600 | bool found; |
---|
1601 | bool cleanup; |
---|
1602 | size_t way; |
---|
1603 | size_t set; |
---|
1604 | paddr_t victim; |
---|
1605 | |
---|
1606 | #ifdef INSTRUMENTATION |
---|
1607 | m_cpt_icache_dir_read++; |
---|
1608 | #endif |
---|
1609 | r_icache.read_select(r_icache_vci_paddr.read(), |
---|
1610 | &victim, |
---|
1611 | &way, |
---|
1612 | &set, |
---|
1613 | &found, |
---|
1614 | &cleanup); |
---|
1615 | if (not found) |
---|
1616 | { |
---|
1617 | break; |
---|
1618 | } |
---|
1619 | else |
---|
1620 | { |
---|
1621 | r_icache_miss_way = way; |
---|
1622 | r_icache_miss_set = set; |
---|
1623 | |
---|
1624 | if (cleanup) |
---|
1625 | { |
---|
1626 | if (not r_icache_cc_send_req.read()) |
---|
1627 | { |
---|
1628 | r_icache_cc_send_req = true; |
---|
1629 | r_icache_cc_send_nline = victim; |
---|
1630 | r_icache_cc_send_way = way; |
---|
1631 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1632 | } |
---|
1633 | else |
---|
1634 | { |
---|
1635 | r_icache_cleanup_victim_req = true; |
---|
1636 | r_icache_cleanup_victim_nline = victim; |
---|
1637 | } |
---|
1638 | |
---|
1639 | r_icache_miss_clack = true; |
---|
1640 | r_icache_fsm = ICACHE_MISS_CLEAN; |
---|
1641 | } |
---|
1642 | else |
---|
1643 | { |
---|
1644 | r_icache_fsm = ICACHE_MISS_WAIT; |
---|
1645 | } |
---|
1646 | |
---|
1647 | #if DEBUG_ICACHE |
---|
1648 | if (m_debug_icache_fsm) |
---|
1649 | { |
---|
1650 | std::cout << " <PROC " << name() |
---|
1651 | << " ICACHE_MISS_SELECT> Select a slot:" << std::dec |
---|
1652 | << " / WAY = " << way |
---|
1653 | << " / SET = " << set; |
---|
1654 | if (cleanup) std::cout << " / VICTIM = " << std::hex << victim << std::endl; |
---|
1655 | else std::cout << std::endl; |
---|
1656 | } |
---|
1657 | #endif |
---|
1658 | } |
---|
1659 | break; |
---|
1660 | } |
---|
1661 | /////////////////////// |
---|
1662 | case ICACHE_MISS_CLEAN: // switch the slot to zombi state |
---|
1663 | { |
---|
1664 | if (m_ireq.valid) m_cost_ins_miss_frz++; |
---|
1665 | |
---|
1666 | #ifdef INSTRUMENTATION |
---|
1667 | m_cpt_icache_dir_write++; |
---|
1668 | #endif |
---|
1669 | r_icache.write_dir(r_icache_miss_way.read(), |
---|
1670 | r_icache_miss_set.read(), |
---|
1671 | CACHE_SLOT_STATE_ZOMBI); |
---|
1672 | #if DEBUG_ICACHE |
---|
1673 | if (m_debug_icache_fsm) |
---|
1674 | { |
---|
1675 | std::cout << " <PROC " << name() |
---|
1676 | << " ICACHE_MISS_CLEAN> Switch to ZOMBI state" << std::dec |
---|
1677 | << " / WAY = " << r_icache_miss_way.read() |
---|
1678 | << " / SET = " << r_icache_miss_set.read() << std::endl; |
---|
1679 | } |
---|
1680 | #endif |
---|
1681 | |
---|
1682 | r_icache_fsm = ICACHE_MISS_WAIT; |
---|
1683 | break; |
---|
1684 | } |
---|
1685 | ////////////////////// |
---|
1686 | case ICACHE_MISS_WAIT: // waiting response from VCI_RSP FSM |
---|
1687 | { |
---|
1688 | if (m_ireq.valid) m_cost_ins_miss_frz++; |
---|
1689 | |
---|
1690 | // send cleanup victim request |
---|
1691 | if (r_icache_cleanup_victim_req.read() and not r_icache_cc_send_req.read()) |
---|
1692 | { |
---|
1693 | r_icache_cc_send_req = true; |
---|
1694 | r_icache_cc_send_nline = r_icache_cleanup_victim_nline; |
---|
1695 | r_icache_cc_send_way = r_icache_miss_way; |
---|
1696 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1697 | r_icache_cleanup_victim_req = false; |
---|
1698 | } |
---|
1699 | |
---|
1700 | // coherence clack interrupt |
---|
1701 | if (r_icache_clack_req.read()) |
---|
1702 | { |
---|
1703 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1704 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1705 | break; |
---|
1706 | } |
---|
1707 | |
---|
1708 | // coherence interrupt |
---|
1709 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read() and not r_icache_cleanup_victim_req.read()) |
---|
1710 | { |
---|
1711 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1712 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1713 | break; |
---|
1714 | } |
---|
1715 | |
---|
1716 | if (r_vci_rsp_ins_error.read()) // bus error |
---|
1717 | { |
---|
1718 | r_mmu_ietr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
1719 | r_mmu_ibvar = r_icache_vaddr_save.read(); |
---|
1720 | m_irsp.valid = true; |
---|
1721 | m_irsp.error = true; |
---|
1722 | r_vci_rsp_ins_error = false; |
---|
1723 | r_icache_fsm = ICACHE_IDLE; |
---|
1724 | } |
---|
1725 | else if (r_vci_rsp_fifo_icache.rok()) // response available |
---|
1726 | { |
---|
1727 | r_icache_miss_word = 0; |
---|
1728 | r_icache_fsm = ICACHE_MISS_DATA_UPDT; |
---|
1729 | } |
---|
1730 | break; |
---|
1731 | } |
---|
1732 | /////////////////////////// |
---|
1733 | case ICACHE_MISS_DATA_UPDT: // update the cache (one word per cycle) |
---|
1734 | { |
---|
1735 | if (m_ireq.valid) m_cost_ins_miss_frz++; |
---|
1736 | |
---|
1737 | if (r_vci_rsp_fifo_icache.rok()) // response available |
---|
1738 | { |
---|
1739 | |
---|
1740 | #ifdef INSTRUMENTATION |
---|
1741 | m_cpt_icache_data_write++; |
---|
1742 | #endif |
---|
1743 | r_icache.write(r_icache_miss_way.read(), |
---|
1744 | r_icache_miss_set.read(), |
---|
1745 | r_icache_miss_word.read(), |
---|
1746 | r_vci_rsp_fifo_icache.read()); |
---|
1747 | #if DEBUG_ICACHE |
---|
1748 | if (m_debug_icache_fsm) |
---|
1749 | { |
---|
1750 | std::cout << " <PROC " << name() |
---|
1751 | << " ICACHE_MISS_DATA_UPDT> Write one word:" |
---|
1752 | << " WDATA = " << std::hex << r_vci_rsp_fifo_icache.read() |
---|
1753 | << " WAY = " << r_icache_miss_way.read() |
---|
1754 | << " SET = " << r_icache_miss_set.read() |
---|
1755 | << " WORD = " << r_icache_miss_word.read() << std::endl; |
---|
1756 | } |
---|
1757 | #endif |
---|
1758 | vci_rsp_fifo_icache_get = true; |
---|
1759 | r_icache_miss_word = r_icache_miss_word.read() + 1; |
---|
1760 | |
---|
1761 | if (r_icache_miss_word.read() == m_icache_words - 1) // last word |
---|
1762 | { |
---|
1763 | r_icache_fsm = ICACHE_MISS_DIR_UPDT; |
---|
1764 | } |
---|
1765 | } |
---|
1766 | break; |
---|
1767 | } |
---|
1768 | ////////////////////////// |
---|
1769 | case ICACHE_MISS_DIR_UPDT: // Stalled if a victim line has been evicted, |
---|
1770 | // and the cleanup ack has not been received, |
---|
1771 | // as indicated by r_icache_miss_clack. |
---|
1772 | // - If no matching coherence request (r_icache_miss_inval) |
---|
1773 | // switch directory slot to VALID state. |
---|
1774 | // - If matching coherence request, switch directory slot |
---|
1775 | // to ZOMBI state, and send a cleanup request. |
---|
1776 | { |
---|
1777 | if (m_ireq.valid ) m_cost_ins_miss_frz++; |
---|
1778 | |
---|
1779 | // send cleanup victim request |
---|
1780 | if (r_icache_cleanup_victim_req.read() and not r_icache_cc_send_req.read()) |
---|
1781 | { |
---|
1782 | r_icache_cc_send_req = true; |
---|
1783 | r_icache_cc_send_nline = r_icache_cleanup_victim_nline; |
---|
1784 | r_icache_cc_send_way = r_icache_miss_way; |
---|
1785 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1786 | r_icache_cleanup_victim_req = false; |
---|
1787 | } |
---|
1788 | |
---|
1789 | // coherence clack interrupt |
---|
1790 | if (r_icache_clack_req.read()) |
---|
1791 | { |
---|
1792 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1793 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1794 | break; |
---|
1795 | } |
---|
1796 | |
---|
1797 | // coherence interrupt |
---|
1798 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read() and not r_icache_cleanup_victim_req.read()) |
---|
1799 | { |
---|
1800 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1801 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1802 | break; |
---|
1803 | } |
---|
1804 | |
---|
1805 | if (not r_icache_miss_clack.read()) // waiting cleanup acknowledge for victim line |
---|
1806 | { |
---|
1807 | if (r_icache_miss_inval) // Switch slot to ZOMBI state, and new cleanup |
---|
1808 | { |
---|
1809 | if (not r_icache_cc_send_req.read()) |
---|
1810 | { |
---|
1811 | r_icache_miss_inval = false; |
---|
1812 | // request cleanup |
---|
1813 | r_icache_cc_send_req = true; |
---|
1814 | r_icache_cc_send_nline = r_icache_vci_paddr.read() / (m_icache_words << 2); |
---|
1815 | r_icache_cc_send_way = r_icache_miss_way.read(); |
---|
1816 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
1817 | |
---|
1818 | #ifdef INSTRUMENTATION |
---|
1819 | m_cpt_icache_dir_write++; |
---|
1820 | #endif |
---|
1821 | r_icache.write_dir(r_icache_vci_paddr.read(), |
---|
1822 | r_icache_miss_way.read(), |
---|
1823 | r_icache_miss_set.read(), |
---|
1824 | CACHE_SLOT_STATE_ZOMBI); |
---|
1825 | #if DEBUG_ICACHE |
---|
1826 | if (m_debug_icache_fsm) |
---|
1827 | { |
---|
1828 | std::cout << " <PROC " << name() |
---|
1829 | << " ICACHE_MISS_DIR_UPDT> Switch cache slot to ZOMBI state" |
---|
1830 | << " PADDR = " << std::hex << r_icache_vci_paddr.read() |
---|
1831 | << " WAY = " << std::dec << r_icache_miss_way.read() |
---|
1832 | << " SET = " << r_icache_miss_set.read() << std::endl; |
---|
1833 | } |
---|
1834 | #endif |
---|
1835 | } |
---|
1836 | else |
---|
1837 | break; |
---|
1838 | } |
---|
1839 | else // Switch slot to VALID state |
---|
1840 | { |
---|
1841 | |
---|
1842 | #ifdef INSTRUMENTATION |
---|
1843 | m_cpt_icache_dir_write++; |
---|
1844 | #endif |
---|
1845 | r_icache.write_dir(r_icache_vci_paddr.read(), |
---|
1846 | r_icache_miss_way.read(), |
---|
1847 | r_icache_miss_set.read(), |
---|
1848 | CACHE_SLOT_STATE_VALID); |
---|
1849 | #if DEBUG_ICACHE |
---|
1850 | if (m_debug_icache_fsm) |
---|
1851 | { |
---|
1852 | std::cout << " <PROC " << name() |
---|
1853 | << " ICACHE_MISS_DIR_UPDT> Switch cache slot to VALID state" |
---|
1854 | << " PADDR = " << std::hex << r_icache_vci_paddr.read() |
---|
1855 | << " WAY = " << std::dec << r_icache_miss_way.read() |
---|
1856 | << " SET = " << r_icache_miss_set.read() << std::endl; |
---|
1857 | } |
---|
1858 | #endif |
---|
1859 | } |
---|
1860 | |
---|
1861 | r_icache_fsm = ICACHE_IDLE; |
---|
1862 | } |
---|
1863 | break; |
---|
1864 | } |
---|
1865 | //////////////////// |
---|
1866 | case ICACHE_UNC_WAIT: // waiting a response to an uncacheable read from VCI_RSP FSM |
---|
1867 | { |
---|
1868 | // coherence clack interrupt |
---|
1869 | if (r_icache_clack_req.read()) |
---|
1870 | { |
---|
1871 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1872 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1873 | break; |
---|
1874 | } |
---|
1875 | |
---|
1876 | // coherence interrupt |
---|
1877 | if (r_cc_receive_icache_req.read() and not r_icache_cc_send_req.read()) |
---|
1878 | { |
---|
1879 | r_icache_fsm = ICACHE_CC_CHECK; |
---|
1880 | r_icache_fsm_save = r_icache_fsm.read(); |
---|
1881 | break; |
---|
1882 | } |
---|
1883 | |
---|
1884 | if (r_vci_rsp_ins_error.read()) // bus error |
---|
1885 | { |
---|
1886 | r_mmu_ietr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
1887 | r_mmu_ibvar = m_ireq.addr; |
---|
1888 | r_vci_rsp_ins_error = false; |
---|
1889 | m_irsp.valid = true; |
---|
1890 | m_irsp.error = true; |
---|
1891 | r_icache_fsm = ICACHE_IDLE; |
---|
1892 | } |
---|
1893 | else if (r_vci_rsp_fifo_icache.rok()) // instruction available |
---|
1894 | { |
---|
1895 | vci_rsp_fifo_icache_get = true; |
---|
1896 | r_icache_fsm = ICACHE_IDLE; |
---|
1897 | if (m_ireq.valid and |
---|
1898 | (m_ireq.addr == r_icache_vaddr_save.read())) // request unmodified |
---|
1899 | { |
---|
1900 | m_irsp.valid = true; |
---|
1901 | m_irsp.instruction = r_vci_rsp_fifo_icache.read(); |
---|
1902 | } |
---|
1903 | } |
---|
1904 | break; |
---|
1905 | } |
---|
1906 | ///////////////////// |
---|
1907 | case ICACHE_CC_CHECK: // This state is the entry point of a sub-fsm |
---|
1908 | // handling coherence requests. |
---|
1909 | // if there is a matching pending miss, it is |
---|
1910 | // signaled in the r_icache_miss_inval flip-flop. |
---|
1911 | // The return state is defined in r_icache_fsm_save. |
---|
1912 | { |
---|
1913 | paddr_t paddr = r_cc_receive_icache_nline.read() * m_icache_words * 4; |
---|
1914 | paddr_t mask = ~((m_icache_words << 2) - 1); |
---|
1915 | |
---|
1916 | // CLACK handler |
---|
1917 | // We switch the directory slot to EMPTY state |
---|
1918 | // and reset r_icache_miss_clack if the cleanup ack |
---|
1919 | // is matching a pending miss. |
---|
1920 | if (r_icache_clack_req.read()) |
---|
1921 | { |
---|
1922 | |
---|
1923 | if (m_ireq.valid) m_cost_ins_miss_frz++; |
---|
1924 | |
---|
1925 | #ifdef INSTRUMENTATION |
---|
1926 | m_cpt_icache_dir_write++; |
---|
1927 | #endif |
---|
1928 | r_icache.write_dir(0, |
---|
1929 | r_icache_clack_way.read(), |
---|
1930 | r_icache_clack_set.read(), |
---|
1931 | CACHE_SLOT_STATE_EMPTY); |
---|
1932 | |
---|
1933 | if ((r_icache_miss_set.read() == r_icache_clack_set.read()) and |
---|
1934 | (r_icache_miss_way.read() == r_icache_clack_way.read())) |
---|
1935 | { |
---|
1936 | r_icache_miss_clack = false; |
---|
1937 | } |
---|
1938 | |
---|
1939 | r_icache_clack_req = false; |
---|
1940 | |
---|
1941 | // return to cc_save state |
---|
1942 | r_icache_fsm = r_icache_fsm_save.read(); |
---|
1943 | |
---|
1944 | #if DEBUG_ICACHE |
---|
1945 | if (m_debug_icache_fsm) |
---|
1946 | { |
---|
1947 | std::cout << " <PROC " << name() |
---|
1948 | << " ICACHE_CC_CHECK> CC_TYPE_CLACK slot returns to empty state" |
---|
1949 | << " set = " << r_icache_clack_set.read() |
---|
1950 | << " / way = " << r_icache_clack_way.read() << std::endl; |
---|
1951 | } |
---|
1952 | #endif |
---|
1953 | |
---|
1954 | break; |
---|
1955 | } |
---|
1956 | |
---|
1957 | assert(not r_icache_cc_send_req.read() and "CC_SEND must be available in ICACHE_CC_CHECK"); |
---|
1958 | |
---|
1959 | // Match between MISS address and CC address |
---|
1960 | if (r_cc_receive_icache_req.read() and |
---|
1961 | ((r_icache_fsm_save.read() == ICACHE_MISS_SELECT) or |
---|
1962 | (r_icache_fsm_save.read() == ICACHE_MISS_WAIT) or |
---|
1963 | (r_icache_fsm_save.read() == ICACHE_MISS_DIR_UPDT)) and |
---|
1964 | ((r_icache_vci_paddr.read() & mask) == (paddr & mask))) // matching |
---|
1965 | { |
---|
1966 | // signaling the matching |
---|
1967 | r_icache_miss_inval = true; |
---|
1968 | |
---|
1969 | // in case of update, go to CC_UPDT |
---|
1970 | // JUST TO POP THE FIFO |
---|
1971 | if (r_cc_receive_icache_type.read() == CC_TYPE_UPDT) |
---|
1972 | { |
---|
1973 | r_icache_fsm = ICACHE_CC_UPDT; |
---|
1974 | r_icache_cc_word = r_cc_receive_word_idx.read(); |
---|
1975 | |
---|
1976 | // just pop the fifo , don't write in icache |
---|
1977 | r_icache_cc_need_write = false; |
---|
1978 | } |
---|
1979 | // the request is dealt with |
---|
1980 | else |
---|
1981 | { |
---|
1982 | r_cc_receive_icache_req = false; |
---|
1983 | r_icache_fsm = r_icache_fsm_save.read(); |
---|
1984 | } |
---|
1985 | #if DEBUG_ICACHE |
---|
1986 | if (m_debug_icache_fsm) |
---|
1987 | { |
---|
1988 | std::cout << " <PROC " << name() |
---|
1989 | << " ICACHE_CC_CHECK> Coherence request matching a pending miss:" |
---|
1990 | << " PADDR = " << std::hex << paddr << std::endl; |
---|
1991 | } |
---|
1992 | #endif |
---|
1993 | } |
---|
1994 | |
---|
1995 | // CC request handler |
---|
1996 | |
---|
1997 | int state = 0; |
---|
1998 | size_t way = 0; |
---|
1999 | size_t set = 0; |
---|
2000 | size_t word = 0; |
---|
2001 | |
---|
2002 | #ifdef INSTRUMENTATION |
---|
2003 | m_cpt_icache_dir_read++; |
---|
2004 | #endif |
---|
2005 | r_icache.read_dir(paddr, |
---|
2006 | &state, |
---|
2007 | &way, |
---|
2008 | &set, |
---|
2009 | &word); |
---|
2010 | |
---|
2011 | r_icache_cc_way = way; |
---|
2012 | r_icache_cc_set = set; |
---|
2013 | |
---|
2014 | if (state == CACHE_SLOT_STATE_VALID) // hit |
---|
2015 | { |
---|
2016 | // need to update the cache state |
---|
2017 | if (r_cc_receive_icache_type.read() == CC_TYPE_UPDT) // hit update |
---|
2018 | { |
---|
2019 | r_icache_cc_need_write = true; |
---|
2020 | r_icache_fsm = ICACHE_CC_UPDT; |
---|
2021 | r_icache_cc_word = r_cc_receive_word_idx.read(); |
---|
2022 | } |
---|
2023 | else if (r_cc_receive_icache_type.read() == CC_TYPE_INVAL) // hit inval |
---|
2024 | { |
---|
2025 | r_icache_fsm = ICACHE_CC_INVAL; |
---|
2026 | } |
---|
2027 | } |
---|
2028 | else // miss |
---|
2029 | { |
---|
2030 | // multicast acknowledgement required in case of update |
---|
2031 | if (r_cc_receive_icache_type.read() == CC_TYPE_UPDT) |
---|
2032 | { |
---|
2033 | r_icache_fsm = ICACHE_CC_UPDT; |
---|
2034 | r_icache_cc_word = r_cc_receive_word_idx.read(); |
---|
2035 | |
---|
2036 | // just pop the fifo , don't write in icache |
---|
2037 | r_icache_cc_need_write = false; |
---|
2038 | } |
---|
2039 | else // No response needed |
---|
2040 | { |
---|
2041 | r_cc_receive_icache_req = false; |
---|
2042 | r_icache_fsm = r_icache_fsm_save.read(); |
---|
2043 | } |
---|
2044 | } |
---|
2045 | break; |
---|
2046 | } |
---|
2047 | ///////////////////// |
---|
2048 | case ICACHE_CC_INVAL: // hit inval : switch slot to ZOMBI state |
---|
2049 | { |
---|
2050 | assert (not r_icache_cc_send_req.read() && |
---|
2051 | "ERROR in ICACHE_CC_INVAL: the r_icache_cc_send_req " |
---|
2052 | "must not be set"); |
---|
2053 | |
---|
2054 | #ifdef INSTRUMENTATION |
---|
2055 | m_cpt_icache_dir_read++; |
---|
2056 | #endif |
---|
2057 | |
---|
2058 | // Switch slot state to ZOMBI and send CLEANUP command |
---|
2059 | r_icache.write_dir(r_icache_cc_way.read(), |
---|
2060 | r_icache_cc_set.read(), |
---|
2061 | CACHE_SLOT_STATE_ZOMBI); |
---|
2062 | |
---|
2063 | // coherence request completed |
---|
2064 | r_icache_cc_send_req = true; |
---|
2065 | r_icache_cc_send_nline = r_cc_receive_icache_nline.read(); |
---|
2066 | r_icache_cc_send_way = r_icache_cc_way.read(); |
---|
2067 | r_icache_cc_send_type = CC_TYPE_CLEANUP; |
---|
2068 | |
---|
2069 | r_icache_fsm = r_icache_fsm_save.read(); |
---|
2070 | |
---|
2071 | #if DEBUG_ICACHE |
---|
2072 | if (m_debug_icache_fsm) |
---|
2073 | { |
---|
2074 | std::cout << " <PROC " << name() |
---|
2075 | << " ICACHE_CC_INVAL> slot returns to ZOMBI state" |
---|
2076 | << " set = " << r_icache_cc_set.read() |
---|
2077 | << " / way = " << r_icache_cc_way.read() << std::endl; |
---|
2078 | } |
---|
2079 | #endif |
---|
2080 | |
---|
2081 | break; |
---|
2082 | } |
---|
2083 | //////////////////// |
---|
2084 | case ICACHE_CC_UPDT: // hit update : write one word per cycle |
---|
2085 | { |
---|
2086 | assert (not r_icache_cc_send_req.read() && |
---|
2087 | "ERROR in ICACHE_CC_UPDT: the r_icache_cc_send_req " |
---|
2088 | "must not be set"); |
---|
2089 | |
---|
2090 | if (not r_cc_receive_updt_fifo_be.rok()) break; |
---|
2091 | |
---|
2092 | |
---|
2093 | size_t word = r_icache_cc_word.read(); |
---|
2094 | size_t way = r_icache_cc_way.read(); |
---|
2095 | size_t set = r_icache_cc_set.read(); |
---|
2096 | |
---|
2097 | if (r_icache_cc_need_write.read()) |
---|
2098 | { |
---|
2099 | r_icache.write(way, |
---|
2100 | set, |
---|
2101 | word, |
---|
2102 | r_cc_receive_updt_fifo_data.read(), |
---|
2103 | r_cc_receive_updt_fifo_be.read()); |
---|
2104 | |
---|
2105 | r_icache_cc_word = word + 1; |
---|
2106 | |
---|
2107 | #ifdef INSTRUMENTATION |
---|
2108 | m_cpt_icache_data_write++; |
---|
2109 | #endif |
---|
2110 | |
---|
2111 | #if DEBUG_ICACHE |
---|
2112 | if (m_debug_icache_fsm) |
---|
2113 | { |
---|
2114 | std::cout << " <PROC " << name() |
---|
2115 | << " ICACHE_CC_UPDT> Write one word " |
---|
2116 | << " set = " << r_icache_cc_set.read() |
---|
2117 | << " / way = " << r_icache_cc_way.read() |
---|
2118 | << " / word = " << r_icache_cc_word.read() << std::endl; |
---|
2119 | } |
---|
2120 | #endif |
---|
2121 | } |
---|
2122 | |
---|
2123 | if (r_cc_receive_updt_fifo_eop.read()) // last word |
---|
2124 | { |
---|
2125 | // no need to write in the cache anymore |
---|
2126 | r_icache_cc_need_write = false; |
---|
2127 | |
---|
2128 | // coherence request completed |
---|
2129 | r_cc_receive_icache_req = false; |
---|
2130 | |
---|
2131 | // request multicast acknowledgement |
---|
2132 | r_icache_cc_send_req = true; |
---|
2133 | r_icache_cc_send_nline = r_cc_receive_icache_nline.read(); |
---|
2134 | r_icache_cc_send_updt_tab_idx = r_cc_receive_icache_updt_tab_idx.read(); |
---|
2135 | r_icache_cc_send_type = CC_TYPE_MULTI_ACK; |
---|
2136 | |
---|
2137 | r_icache_fsm = r_icache_fsm_save.read(); |
---|
2138 | } |
---|
2139 | //consume fifo if not eop |
---|
2140 | cc_receive_updt_fifo_get = true; |
---|
2141 | |
---|
2142 | break; |
---|
2143 | } |
---|
2144 | |
---|
2145 | } // end switch r_icache_fsm |
---|
2146 | |
---|
2147 | //////////////////////////////////////////////////////////////////////////////////// |
---|
2148 | // DCACHE FSM |
---|
2149 | // |
---|
2150 | // 1/ Coherence operations |
---|
2151 | // They are handled as interrupts generated by the CC_RECEIVE FSM. |
---|
2152 | // - There is a coherence request when r_tgt_dcache_req is set. |
---|
2153 | // They are taken in IDLE, MISS_WAIT, MISS_DIR_UPDT, UNC_WAIT, LL_WAIT |
---|
2154 | // and SC_WAIT states. |
---|
2155 | // - There is a cleanup acknowledge request when r_cleanup_dcache_req is set. |
---|
2156 | // They are taken in IDLE, MISS_SELECT, MISS_CLEAN, MISS_WAIT, MISS_DATA_UPDT, |
---|
2157 | // MISS_DIR_UPDT, UNC_WAIT, LL_WAIT, SC_WAIT states. |
---|
2158 | // - For both types of requests, actions associated to the pre-empted state |
---|
2159 | // are not executed. The DCACHE FSM goes to the proper sub-FSM (CC_CHECK |
---|
2160 | // or CC_CLACK) to execute the requested coherence operation, and returns |
---|
2161 | // to the pre-empted state. |
---|
2162 | // |
---|
2163 | // 2/ TLB miss |
---|
2164 | // The page tables are generally cacheable. |
---|
2165 | // In case of miss in itlb or dtlb, the tlb miss is handled by a dedicated |
---|
2166 | // sub-fsm (DCACHE_TLB_MISS state), that handle possible miss in DCACHE, |
---|
2167 | // this sub-fsm implement the table-walk... |
---|
2168 | // |
---|
2169 | // 3/ processor requests |
---|
2170 | // Processor requests are taken in IDLE state only. |
---|
2171 | // The IDLE state implements a two stages pipe-line to handle write bursts: |
---|
2172 | // - Both DTLB and DCACHE are accessed in stage P0 (if processor request valid). |
---|
2173 | // - The registration in wbuf and the dcache update is done in stage P1 |
---|
2174 | // (if the processor request is a write). |
---|
2175 | // The two r_dcache_wbuf_req and r_dcache_updt_req flip-flops define |
---|
2176 | // the operations that must be done in P1 stage, and the access type |
---|
2177 | // (read or write) to the DATA part of DCACHE depends on r_dcache_updt_req. |
---|
2178 | // READ requests are delayed if a cache update is requested. |
---|
2179 | // WRITE or SC requests can require a PTE Dirty bit update (in memory), |
---|
2180 | // that is done (before handling the processor request) by a dedicated sub-fsm. |
---|
2181 | // If a PTE is modified, both the itlb and dtlb are selectively, but sequencially |
---|
2182 | // cleared by a dedicated sub_fsm (DCACHE_INVAL_TLB_SCAN state). |
---|
2183 | // |
---|
2184 | // 4/ Atomic instructions LL/SC |
---|
2185 | // The LL/SC address are non cacheable (systematic access to memory). |
---|
2186 | // The llsc buffer contains a registration for an active LL/SC operation |
---|
2187 | // (with an address, a registration key, an aging counter and a valid bit). |
---|
2188 | // - LL requests from the processor are transmitted as a one flit VCI command |
---|
2189 | // (CMD_LOCKED_READ as CMD, and TYPE_LL as PKTID value). PLEN must |
---|
2190 | // be 8 as the response is 2 flits long (data and registration key) |
---|
2191 | // - SC requests from the processor are systematically transmitted to the |
---|
2192 | // memory cache as 2 flits VCI command (CMD_STORE_COND as CMD, and TYPE_SC |
---|
2193 | // as PKTID value). The first flit contains the registration key, the second |
---|
2194 | // flit contains the data to write in case of success. |
---|
2195 | // The cache is not updated, as this is done in case of success by the |
---|
2196 | // coherence transaction. |
---|
2197 | // |
---|
2198 | // 5/ Non cacheable access: |
---|
2199 | // This component implement a strong order between non cacheable access |
---|
2200 | // (read or write) : A new non cacheable VCI transaction starts only when |
---|
2201 | // the previous non cacheable transaction is completed. After send the VCI |
---|
2202 | // transaction, the DCACHE FSM wait for the respone in the DCACHE_UNC_WAIT state. |
---|
2203 | // So the processor is blocked until the respone arrives in CACHE L1. |
---|
2204 | // |
---|
2205 | // 6/ Error handling: |
---|
2206 | // When the MMU is not activated, Read Bus Errors are synchronous events, |
---|
2207 | // Some Write Bus Errors are synchronous events when the request is a non cacheable access |
---|
2208 | // but some Write Bus Errors are asynchronous events when the request is cacheable access |
---|
2209 | // (processor is not frozen). |
---|
2210 | // - If a Read Bus Error or a Non Cacheable Write Bus Error is detected, the VCI_RSP FSM sets the |
---|
2211 | // r_vci_rsp_data_error flip-flop, without writing any data in the |
---|
2212 | // r_vci_rsp_fifo_dcache FIFO, and the synchronous error is signaled |
---|
2213 | // by the DCACHE FSM. |
---|
2214 | // - If a Cacheable Write Bus Error is detected, the VCI_RSP_FSM signals |
---|
2215 | // the asynchronous error using the setWriteBerr() method. |
---|
2216 | // When the MMU is activated bus error are rare events, as the MMU |
---|
2217 | // checks the physical address before the VCI transaction starts. |
---|
2218 | //////////////////////////////////////////////////////////////////////////////////////// |
---|
2219 | |
---|
2220 | // default value for m_drsp |
---|
2221 | m_drsp.valid = false; |
---|
2222 | m_drsp.error = false; |
---|
2223 | m_drsp.rdata = 0; |
---|
2224 | |
---|
2225 | switch (r_dcache_fsm.read()) |
---|
2226 | { |
---|
2227 | case DCACHE_IDLE: // There are 10 conditions to exit the IDLE state : |
---|
2228 | // 1) ITLB/DTLB inval request (update) => DCACHE_INVAL_TLB_SCAN |
---|
2229 | // 2) Coherence request (TGT FSM) => DCACHE_CC_CHECK |
---|
2230 | // 3) ITLB miss request (ICACHE FSM) => DCACHE_TLB_MISS |
---|
2231 | // 4) XTN request (processor) => DCACHE_XTN_* |
---|
2232 | // 5) DTLB miss (processor) => DCACHE_TLB_MISS |
---|
2233 | // 6) Dirty bit update (processor) => DCACHE_DIRTY_GET_PTE |
---|
2234 | // 7) Cacheable read miss (processor) => DCACHE_MISS_SELECT |
---|
2235 | // 8) Uncacheable read/write (processor)=> DCACHE_UNC_WAIT |
---|
2236 | // 9) LL access (processor) => DCACHE_LL_WAIT |
---|
2237 | // 10) SC access (processor) => DCACHE_SC_WAIT |
---|
2238 | // |
---|
2239 | // There is a fixed priority to handle requests to DCACHE: |
---|
2240 | // 1/ the ITLB/DTLB invalidate requests |
---|
2241 | // 2/ the coherence requests, |
---|
2242 | // 3/ the processor requests (including DTLB miss), |
---|
2243 | // 4/ the ITLB miss requests, |
---|
2244 | // The address space processor request are handled as follows: |
---|
2245 | // - WRITE request is blocked if the Dirty bit mus be set. |
---|
2246 | // If DTLB hit, the P1 stage is activated (writes WBUF, and |
---|
2247 | // updates DCACHE if DCACHE hit) & processor request acknowledged. |
---|
2248 | // - READ request generate a simultaneouss access to DCACHE.DATA |
---|
2249 | // and DCACHE.DIR, but is delayed if DCACHE update required. |
---|
2250 | // |
---|
2251 | // There is 4 configurations defining the access type to |
---|
2252 | // DTLB, DCACHE.DATA, and DCACHE.DIR, depending on the |
---|
2253 | // dreq.valid (dreq) and r_dcache_updt_req (updt) signals: |
---|
2254 | // dreq / updt / DTLB / DCACHE.DIR / DCACHE.DATA / |
---|
2255 | // 0 / 0 / NOP / NOP / NOP / |
---|
2256 | // 0 / 1 / NOP / NOP / WRITE / |
---|
2257 | // 1 / 0 / READ / READ / NOP / |
---|
2258 | // 1 / 1 / READ / READ / WRITE / |
---|
2259 | // Those two registers are set at each cycle from the 3 signals |
---|
2260 | // updt_request, wbuf_request, wbuf_write_miss. |
---|
2261 | { |
---|
2262 | paddr_t paddr; |
---|
2263 | pte_info_t tlb_flags; |
---|
2264 | size_t tlb_way; |
---|
2265 | size_t tlb_set; |
---|
2266 | paddr_t tlb_nline = 0; |
---|
2267 | size_t cache_way; |
---|
2268 | size_t cache_set; |
---|
2269 | size_t cache_word; |
---|
2270 | uint32_t cache_rdata = 0; |
---|
2271 | bool tlb_hit = false; |
---|
2272 | int cache_state = CACHE_SLOT_STATE_EMPTY; |
---|
2273 | |
---|
2274 | bool tlb_inval_required = false; // request TLB inval after cache update |
---|
2275 | bool wbuf_write_miss = false; // miss a WBUF write request |
---|
2276 | bool updt_request = false; // request DCACHE update in P1 stage |
---|
2277 | bool wbuf_request = false; // request WBUF write in P1 stage |
---|
2278 | |
---|
2279 | // physical address computation : systematic DTLB access if activated |
---|
2280 | paddr = (paddr_t) m_dreq.addr; |
---|
2281 | if (m_dreq.valid) |
---|
2282 | { |
---|
2283 | if (r_mmu_mode.read() & DATA_TLB_MASK) // DTLB activated |
---|
2284 | { |
---|
2285 | tlb_hit = r_dtlb.translate(m_dreq.addr, |
---|
2286 | &paddr, |
---|
2287 | &tlb_flags, |
---|
2288 | &tlb_nline, |
---|
2289 | &tlb_way, |
---|
2290 | &tlb_set); |
---|
2291 | #ifdef INSTRUMENTATION |
---|
2292 | m_cpt_dtlb_read++; |
---|
2293 | #endif |
---|
2294 | } |
---|
2295 | else // identity mapping |
---|
2296 | { |
---|
2297 | // we take into account the paddr extension |
---|
2298 | if (vci_param::N > 32) |
---|
2299 | paddr = paddr | ((paddr_t) (r_dcache_paddr_ext.read()) << 32); |
---|
2300 | } |
---|
2301 | } // end physical address computation |
---|
2302 | |
---|
2303 | // systematic DCACHE access depending on r_dcache_updt_req (if activated) |
---|
2304 | if (r_mmu_mode.read() & DATA_CACHE_MASK) |
---|
2305 | { |
---|
2306 | |
---|
2307 | if (m_dreq.valid and r_dcache_updt_req.read()) // read DIR and write DATA |
---|
2308 | { |
---|
2309 | r_dcache.read_dir(paddr, |
---|
2310 | &cache_state, |
---|
2311 | &cache_way, |
---|
2312 | &cache_set, |
---|
2313 | &cache_word); |
---|
2314 | |
---|
2315 | r_dcache.write(r_dcache_save_cache_way.read(), |
---|
2316 | r_dcache_save_cache_set.read(), |
---|
2317 | r_dcache_save_cache_word.read(), |
---|
2318 | r_dcache_save_wdata.read(), |
---|
2319 | r_dcache_save_be.read()); |
---|
2320 | #ifdef INSTRUMENTATION |
---|
2321 | m_cpt_dcache_dir_read++; |
---|
2322 | m_cpt_dcache_data_write++; |
---|
2323 | #endif |
---|
2324 | } |
---|
2325 | else if (m_dreq.valid and not r_dcache_updt_req.read()) // read DIR and DATA |
---|
2326 | { |
---|
2327 | r_dcache.read(paddr, |
---|
2328 | &cache_rdata, |
---|
2329 | &cache_way, |
---|
2330 | &cache_set, |
---|
2331 | &cache_word, |
---|
2332 | &cache_state); |
---|
2333 | |
---|
2334 | #ifdef INSTRUMENTATION |
---|
2335 | m_cpt_dcache_dir_read++; |
---|
2336 | m_cpt_dcache_data_read++; |
---|
2337 | #endif |
---|
2338 | } |
---|
2339 | else if (not m_dreq.valid and r_dcache_updt_req.read()) // write DATA |
---|
2340 | { |
---|
2341 | r_dcache.write(r_dcache_save_cache_way.read(), |
---|
2342 | r_dcache_save_cache_set.read(), |
---|
2343 | r_dcache_save_cache_word.read(), |
---|
2344 | r_dcache_save_wdata.read(), |
---|
2345 | r_dcache_save_be.read()); |
---|
2346 | #ifdef INSTRUMENTATION |
---|
2347 | m_cpt_dcache_data_write++; |
---|
2348 | #endif |
---|
2349 | } |
---|
2350 | } // end dcache access |
---|
2351 | |
---|
2352 | // DCACHE update in P1 stage can require ITLB / DTLB inval or flush |
---|
2353 | if (r_dcache_updt_req.read()) |
---|
2354 | { |
---|
2355 | size_t way = r_dcache_save_cache_way.read(); |
---|
2356 | size_t set = r_dcache_save_cache_set.read(); |
---|
2357 | |
---|
2358 | if (r_dcache_in_tlb[way * m_dcache_sets + set]) |
---|
2359 | { |
---|
2360 | tlb_inval_required = true; |
---|
2361 | r_dcache_tlb_inval_set = 0; |
---|
2362 | r_dcache_tlb_inval_line = r_dcache_save_paddr.read() >> |
---|
2363 | (uint32_log2(m_dcache_words << 2)); |
---|
2364 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
2365 | } |
---|
2366 | else if (r_dcache_contains_ptd[way * m_dcache_sets + set]) |
---|
2367 | { |
---|
2368 | r_itlb.reset(); |
---|
2369 | r_dtlb.reset(); |
---|
2370 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
2371 | } |
---|
2372 | |
---|
2373 | #if DEBUG_DCACHE |
---|
2374 | if (m_debug_dcache_fsm) |
---|
2375 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2376 | << " Cache update in P1 stage" << std::dec |
---|
2377 | << " / WAY = " << r_dcache_save_cache_way.read() |
---|
2378 | << " / SET = " << r_dcache_save_cache_set.read() |
---|
2379 | << " / WORD = " << r_dcache_save_cache_word.read() << std::hex |
---|
2380 | << " / WDATA = " << r_dcache_save_wdata.read() |
---|
2381 | << " / BE = " << r_dcache_save_be.read() << std::endl; |
---|
2382 | #endif |
---|
2383 | } // end test TLB inval |
---|
2384 | |
---|
2385 | // Try WBUF update in P1 stage |
---|
2386 | // Miss if the write request is non cacheable, and there is a pending |
---|
2387 | // non cacheable write, or if the write buffer is full. |
---|
2388 | if (r_dcache_wbuf_req.read()) |
---|
2389 | { |
---|
2390 | bool wok = r_wbuf.write(r_dcache_save_paddr.read(), |
---|
2391 | r_dcache_save_be.read(), |
---|
2392 | r_dcache_save_wdata.read(), |
---|
2393 | true); |
---|
2394 | #ifdef INSTRUMENTATION |
---|
2395 | m_cpt_wbuf_write++; |
---|
2396 | #endif |
---|
2397 | if (not wok ) // miss if write buffer full |
---|
2398 | { |
---|
2399 | wbuf_write_miss = true; |
---|
2400 | } |
---|
2401 | } // end WBUF update |
---|
2402 | |
---|
2403 | // Computing the response to processor, |
---|
2404 | // and the next value for r_dcache_fsm |
---|
2405 | |
---|
2406 | // itlb/dtlb invalidation self-request |
---|
2407 | if (tlb_inval_required) |
---|
2408 | { |
---|
2409 | r_dcache_fsm_scan_save = r_dcache_fsm.read(); |
---|
2410 | r_dcache_fsm = DCACHE_INVAL_TLB_SCAN; |
---|
2411 | } |
---|
2412 | |
---|
2413 | // coherence clack request (from DSPIN CLACK) |
---|
2414 | else if (r_dcache_clack_req.read()) |
---|
2415 | { |
---|
2416 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
2417 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
2418 | } |
---|
2419 | // coherence request (from CC_RECEIVE FSM) |
---|
2420 | else if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
2421 | { |
---|
2422 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
2423 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
2424 | } |
---|
2425 | |
---|
2426 | // processor request (READ, WRITE, LL, SC, XTN_READ, XTN_WRITE) |
---|
2427 | // we don't take the processor request, and registers |
---|
2428 | // are frozen in case of wbuf_write_miss |
---|
2429 | else if (m_dreq.valid and not wbuf_write_miss) |
---|
2430 | { |
---|
2431 | // register processor request and DCACHE response |
---|
2432 | r_dcache_save_vaddr = m_dreq.addr; |
---|
2433 | r_dcache_save_be = m_dreq.be; |
---|
2434 | r_dcache_save_wdata = m_dreq.wdata; |
---|
2435 | r_dcache_save_paddr = paddr; |
---|
2436 | r_dcache_save_cache_way = cache_way; |
---|
2437 | r_dcache_save_cache_set = cache_set; |
---|
2438 | r_dcache_save_cache_word = cache_word; |
---|
2439 | |
---|
2440 | // READ XTN requests from processor |
---|
2441 | // They are executed in this DCACHE_IDLE state. |
---|
2442 | // The processor must not be in user mode |
---|
2443 | if (m_dreq.type == iss_t::XTN_READ) |
---|
2444 | { |
---|
2445 | int xtn_opcode = (int) m_dreq.addr / 4; |
---|
2446 | |
---|
2447 | // checking processor mode: |
---|
2448 | if (m_dreq.mode == iss_t::MODE_USER) |
---|
2449 | { |
---|
2450 | r_mmu_detr = MMU_READ_PRIVILEGE_VIOLATION; |
---|
2451 | r_mmu_dbvar = m_dreq.addr; |
---|
2452 | m_drsp.valid = true; |
---|
2453 | m_drsp.error = true; |
---|
2454 | m_drsp.rdata = 0; |
---|
2455 | r_dcache_fsm = DCACHE_IDLE; |
---|
2456 | } |
---|
2457 | else |
---|
2458 | { |
---|
2459 | switch (xtn_opcode) |
---|
2460 | { |
---|
2461 | case iss_t::XTN_INS_ERROR_TYPE: |
---|
2462 | m_drsp.rdata = r_mmu_ietr.read(); |
---|
2463 | m_drsp.valid = true; |
---|
2464 | m_drsp.error = false; |
---|
2465 | break; |
---|
2466 | |
---|
2467 | case iss_t::XTN_DATA_ERROR_TYPE: |
---|
2468 | m_drsp.rdata = r_mmu_detr.read(); |
---|
2469 | m_drsp.valid = true; |
---|
2470 | m_drsp.error = false; |
---|
2471 | break; |
---|
2472 | |
---|
2473 | case iss_t::XTN_INS_BAD_VADDR: |
---|
2474 | m_drsp.rdata = r_mmu_ibvar.read(); |
---|
2475 | m_drsp.valid = true; |
---|
2476 | m_drsp.error = false; |
---|
2477 | break; |
---|
2478 | |
---|
2479 | case iss_t::XTN_DATA_BAD_VADDR: |
---|
2480 | m_drsp.rdata = r_mmu_dbvar.read(); |
---|
2481 | m_drsp.valid = true; |
---|
2482 | m_drsp.error = false; |
---|
2483 | break; |
---|
2484 | |
---|
2485 | case iss_t::XTN_PTPR: |
---|
2486 | m_drsp.rdata = r_mmu_ptpr.read(); |
---|
2487 | m_drsp.valid = true; |
---|
2488 | m_drsp.error = false; |
---|
2489 | break; |
---|
2490 | |
---|
2491 | case iss_t::XTN_TLB_MODE: |
---|
2492 | m_drsp.rdata = r_mmu_mode.read(); |
---|
2493 | m_drsp.valid = true; |
---|
2494 | m_drsp.error = false; |
---|
2495 | break; |
---|
2496 | |
---|
2497 | case iss_t::XTN_MMU_PARAMS: |
---|
2498 | m_drsp.rdata = r_mmu_params; |
---|
2499 | m_drsp.valid = true; |
---|
2500 | m_drsp.error = false; |
---|
2501 | break; |
---|
2502 | |
---|
2503 | case iss_t::XTN_MMU_RELEASE: |
---|
2504 | m_drsp.rdata = r_mmu_release; |
---|
2505 | m_drsp.valid = true; |
---|
2506 | m_drsp.error = false; |
---|
2507 | break; |
---|
2508 | |
---|
2509 | case iss_t::XTN_MMU_WORD_LO: |
---|
2510 | m_drsp.rdata = r_mmu_word_lo.read(); |
---|
2511 | m_drsp.valid = true; |
---|
2512 | m_drsp.error = false; |
---|
2513 | break; |
---|
2514 | |
---|
2515 | case iss_t::XTN_MMU_WORD_HI: |
---|
2516 | m_drsp.rdata = r_mmu_word_hi.read(); |
---|
2517 | m_drsp.valid = true; |
---|
2518 | m_drsp.error = false; |
---|
2519 | break; |
---|
2520 | |
---|
2521 | case iss_t::XTN_DATA_PADDR_EXT: |
---|
2522 | m_drsp.rdata = r_dcache_paddr_ext.read(); |
---|
2523 | m_drsp.valid = true; |
---|
2524 | m_drsp.error = false; |
---|
2525 | break; |
---|
2526 | |
---|
2527 | case iss_t::XTN_INST_PADDR_EXT: |
---|
2528 | m_drsp.rdata = r_icache_paddr_ext.read(); |
---|
2529 | m_drsp.valid = true; |
---|
2530 | m_drsp.error = false; |
---|
2531 | break; |
---|
2532 | |
---|
2533 | case XTN_WDT_MAX: |
---|
2534 | m_drsp.rdata = r_dcache_miss_wdt_max.read(); |
---|
2535 | m_drsp.valid = true; |
---|
2536 | m_drsp.error = false; |
---|
2537 | break; |
---|
2538 | |
---|
2539 | default: |
---|
2540 | r_mmu_detr = MMU_READ_UNDEFINED_XTN; |
---|
2541 | r_mmu_dbvar = m_dreq.addr; |
---|
2542 | m_drsp.valid = true; |
---|
2543 | m_drsp.error = true; |
---|
2544 | m_drsp.rdata = 0; |
---|
2545 | break; |
---|
2546 | } // end switch xtn_opcode |
---|
2547 | } // end else |
---|
2548 | } // end if XTN_READ |
---|
2549 | |
---|
2550 | // Handling WRITE XTN requests from processor. |
---|
2551 | // They are not executed in this DCACHE_IDLE state |
---|
2552 | // if they require access to the caches or the TLBs |
---|
2553 | // that are already accessed. |
---|
2554 | // Caches can be invalidated or flushed in user mode, |
---|
2555 | // and the sync instruction can be executed in user mode |
---|
2556 | else if (m_dreq.type == iss_t::XTN_WRITE) |
---|
2557 | { |
---|
2558 | int xtn_opcode = (int)m_dreq.addr / 4; |
---|
2559 | r_dcache_xtn_opcode = xtn_opcode; |
---|
2560 | |
---|
2561 | // checking processor mode: |
---|
2562 | if ((m_dreq.mode == iss_t::MODE_USER) && |
---|
2563 | (xtn_opcode != iss_t::XTN_SYNC) && |
---|
2564 | (xtn_opcode != iss_t::XTN_DCACHE_INVAL) && |
---|
2565 | (xtn_opcode != iss_t::XTN_DCACHE_FLUSH) && |
---|
2566 | (xtn_opcode != iss_t::XTN_ICACHE_INVAL) && |
---|
2567 | (xtn_opcode != iss_t::XTN_ICACHE_FLUSH)) |
---|
2568 | { |
---|
2569 | r_mmu_detr = MMU_WRITE_PRIVILEGE_VIOLATION; |
---|
2570 | r_mmu_dbvar = m_dreq.addr; |
---|
2571 | m_drsp.valid = true; |
---|
2572 | m_drsp.error = true; |
---|
2573 | m_drsp.rdata = 0; |
---|
2574 | r_dcache_fsm = DCACHE_IDLE; |
---|
2575 | } |
---|
2576 | else |
---|
2577 | { |
---|
2578 | switch (xtn_opcode) |
---|
2579 | { |
---|
2580 | case iss_t::XTN_PTPR: // itlb & dtlb must be flushed |
---|
2581 | r_dcache_xtn_req = true; |
---|
2582 | r_dcache_fsm = DCACHE_XTN_SWITCH; |
---|
2583 | break; |
---|
2584 | |
---|
2585 | case iss_t::XTN_TLB_MODE: // no cache or tlb access |
---|
2586 | r_mmu_mode = m_dreq.wdata; |
---|
2587 | m_drsp.valid = true; |
---|
2588 | r_dcache_fsm = DCACHE_IDLE; |
---|
2589 | break; |
---|
2590 | |
---|
2591 | case iss_t::XTN_DTLB_INVAL: // dtlb access |
---|
2592 | r_dcache_fsm = DCACHE_XTN_DT_INVAL; |
---|
2593 | break; |
---|
2594 | |
---|
2595 | case iss_t::XTN_ITLB_INVAL: // itlb access |
---|
2596 | r_dcache_xtn_req = true; |
---|
2597 | r_dcache_fsm = DCACHE_XTN_IT_INVAL; |
---|
2598 | break; |
---|
2599 | |
---|
2600 | case iss_t::XTN_DCACHE_INVAL: // dcache, dtlb & itlb access |
---|
2601 | r_dcache_fsm = DCACHE_XTN_DC_INVAL_VA; |
---|
2602 | break; |
---|
2603 | |
---|
2604 | case iss_t::XTN_MMU_DCACHE_PA_INV: // dcache, dtlb & itlb access |
---|
2605 | r_dcache_fsm = DCACHE_XTN_DC_INVAL_PA; |
---|
2606 | if (sizeof(paddr_t) <= 32) |
---|
2607 | { |
---|
2608 | assert(r_mmu_word_hi.read() == 0 && |
---|
2609 | "high bits should be 0 for 32bit paddr"); |
---|
2610 | r_dcache_save_paddr = (paddr_t)r_mmu_word_lo.read(); |
---|
2611 | } |
---|
2612 | else |
---|
2613 | { |
---|
2614 | r_dcache_save_paddr = (paddr_t)r_mmu_word_hi.read() << 32 | |
---|
2615 | (paddr_t)r_mmu_word_lo.read(); |
---|
2616 | } |
---|
2617 | break; |
---|
2618 | |
---|
2619 | case iss_t::XTN_DCACHE_FLUSH: // itlb and dtlb must be reset |
---|
2620 | r_dcache_flush_count = 0; |
---|
2621 | r_dcache_fsm = DCACHE_XTN_DC_FLUSH; |
---|
2622 | break; |
---|
2623 | |
---|
2624 | case iss_t::XTN_ICACHE_INVAL: // icache and itlb access |
---|
2625 | r_dcache_xtn_req = true; |
---|
2626 | r_dcache_fsm = DCACHE_XTN_IC_INVAL_VA; |
---|
2627 | break; |
---|
2628 | |
---|
2629 | case iss_t::XTN_MMU_ICACHE_PA_INV: // icache access |
---|
2630 | r_dcache_xtn_req = true; |
---|
2631 | r_dcache_fsm = DCACHE_XTN_IC_INVAL_PA; |
---|
2632 | break; |
---|
2633 | |
---|
2634 | case iss_t::XTN_ICACHE_FLUSH: // icache access |
---|
2635 | r_dcache_xtn_req = true; |
---|
2636 | r_dcache_fsm = DCACHE_XTN_IC_FLUSH; |
---|
2637 | break; |
---|
2638 | |
---|
2639 | case iss_t::XTN_SYNC: // wait until write buffer empty |
---|
2640 | r_dcache_fsm = DCACHE_XTN_SYNC; |
---|
2641 | break; |
---|
2642 | |
---|
2643 | case iss_t::XTN_MMU_WORD_LO: // no cache or tlb access |
---|
2644 | r_mmu_word_lo = m_dreq.wdata; |
---|
2645 | m_drsp.valid = true; |
---|
2646 | r_dcache_fsm = DCACHE_IDLE; |
---|
2647 | break; |
---|
2648 | |
---|
2649 | case iss_t::XTN_MMU_WORD_HI: // no cache or tlb access |
---|
2650 | r_mmu_word_hi = m_dreq.wdata; |
---|
2651 | m_drsp.valid = true; |
---|
2652 | r_dcache_fsm = DCACHE_IDLE; |
---|
2653 | break; |
---|
2654 | |
---|
2655 | case iss_t::XTN_MMU_LL_RESET: // no cache or tlb access |
---|
2656 | r_dcache_llsc_valid = false; |
---|
2657 | m_drsp.valid = true; |
---|
2658 | r_dcache_fsm = DCACHE_IDLE; |
---|
2659 | break; |
---|
2660 | |
---|
2661 | case iss_t::XTN_DATA_PADDR_EXT: // no cache or tlb access |
---|
2662 | r_dcache_paddr_ext = m_dreq.wdata; |
---|
2663 | m_drsp.valid = true; |
---|
2664 | r_dcache_fsm = DCACHE_IDLE; |
---|
2665 | break; |
---|
2666 | |
---|
2667 | case iss_t::XTN_INST_PADDR_EXT: // no cache or tlb access |
---|
2668 | r_dcache_xtn_req = true; |
---|
2669 | r_dcache_fsm = DCACHE_XTN_IC_PADDR_EXT; |
---|
2670 | break; |
---|
2671 | |
---|
2672 | case iss_t::XTN_ICACHE_PREFETCH: // not implemented : no action |
---|
2673 | case iss_t::XTN_DCACHE_PREFETCH: // not implemented : no action |
---|
2674 | m_drsp.valid = true; |
---|
2675 | r_dcache_fsm = DCACHE_IDLE; |
---|
2676 | break; |
---|
2677 | |
---|
2678 | case XTN_WDT_MAX: |
---|
2679 | r_dcache_miss_wdt_max = m_dreq.wdata; |
---|
2680 | m_drsp.valid = true; |
---|
2681 | r_dcache_fsm = DCACHE_IDLE; |
---|
2682 | break; |
---|
2683 | |
---|
2684 | case iss_t::XTN_DEBUG_MASK: // debug mask |
---|
2685 | m_debug_dcache_fsm = ((m_dreq.wdata & 0x1) != 0); |
---|
2686 | m_debug_icache_fsm = ((m_dreq.wdata & 0x2) != 0); |
---|
2687 | m_debug_cmd_fsm = ((m_dreq.wdata & 0x4) != 0); |
---|
2688 | m_drsp.valid = true; |
---|
2689 | r_dcache_fsm = DCACHE_IDLE; |
---|
2690 | break; |
---|
2691 | |
---|
2692 | default: |
---|
2693 | r_mmu_detr = MMU_WRITE_UNDEFINED_XTN; |
---|
2694 | r_mmu_dbvar = m_dreq.addr; |
---|
2695 | m_drsp.valid = true; |
---|
2696 | m_drsp.error = true; |
---|
2697 | r_dcache_fsm = DCACHE_IDLE; |
---|
2698 | break; |
---|
2699 | } // end switch xtn_opcode |
---|
2700 | } // end else |
---|
2701 | } // end if XTN_WRITE |
---|
2702 | |
---|
2703 | // Handling processor requests to address space (READ/WRITE/LL/SC) |
---|
2704 | // The dtlb and dcache can be activated or not. |
---|
2705 | // We compute the cacheability, and check processor request validity: |
---|
2706 | // - If DTLB not activated : cacheability is defined by the segment table, |
---|
2707 | // and there is no access rights checking. |
---|
2708 | // - If DTLB activated : cacheability is defined by the C bit in the PTE, |
---|
2709 | // and the U & W bits of the PTE are checked, as well as the DTLB hit. |
---|
2710 | // Jumps to the TLB_MISS sub-fsm in case of dtlb miss. |
---|
2711 | else |
---|
2712 | { |
---|
2713 | bool valid_req; |
---|
2714 | bool cacheable; |
---|
2715 | |
---|
2716 | if (not (r_mmu_mode.read() & DATA_TLB_MASK)) // dtlb not activated |
---|
2717 | { |
---|
2718 | valid_req = true; |
---|
2719 | |
---|
2720 | if (not (r_mmu_mode.read() & DATA_CACHE_MASK)) cacheable = false; |
---|
2721 | else cacheable = m_cacheability_table[(uint64_t)m_dreq.addr]; |
---|
2722 | } |
---|
2723 | else // dtlb activated |
---|
2724 | { |
---|
2725 | if (tlb_hit) // tlb hit |
---|
2726 | { |
---|
2727 | // cacheability |
---|
2728 | if (not (r_mmu_mode.read() & DATA_CACHE_MASK)) cacheable = false; |
---|
2729 | else cacheable = tlb_flags.c; |
---|
2730 | |
---|
2731 | // access rights checking |
---|
2732 | if (not tlb_flags.u and (m_dreq.mode == iss_t::MODE_USER)) |
---|
2733 | { |
---|
2734 | if ((m_dreq.type == iss_t::DATA_READ) or |
---|
2735 | (m_dreq.type == iss_t::DATA_LL)) |
---|
2736 | { |
---|
2737 | r_mmu_detr = MMU_READ_PRIVILEGE_VIOLATION; |
---|
2738 | } |
---|
2739 | else |
---|
2740 | { |
---|
2741 | r_mmu_detr = MMU_WRITE_PRIVILEGE_VIOLATION; |
---|
2742 | } |
---|
2743 | valid_req = false; |
---|
2744 | r_mmu_dbvar = m_dreq.addr; |
---|
2745 | m_drsp.valid = true; |
---|
2746 | m_drsp.error = true; |
---|
2747 | m_drsp.rdata = 0; |
---|
2748 | #if DEBUG_DCACHE |
---|
2749 | if (m_debug_dcache_fsm) |
---|
2750 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2751 | << " HIT in dtlb, but privilege violation" << std::endl; |
---|
2752 | #endif |
---|
2753 | } |
---|
2754 | else if (not tlb_flags.w and |
---|
2755 | ((m_dreq.type == iss_t::DATA_WRITE) or |
---|
2756 | (m_dreq.type == iss_t::DATA_SC))) |
---|
2757 | { |
---|
2758 | r_mmu_detr = MMU_WRITE_ACCES_VIOLATION; |
---|
2759 | valid_req = false; |
---|
2760 | r_mmu_dbvar = m_dreq.addr; |
---|
2761 | m_drsp.valid = true; |
---|
2762 | m_drsp.error = true; |
---|
2763 | m_drsp.rdata = 0; |
---|
2764 | #if DEBUG_DCACHE |
---|
2765 | if (m_debug_dcache_fsm) |
---|
2766 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2767 | << " HIT in dtlb, but writable violation" << std::endl; |
---|
2768 | #endif |
---|
2769 | } |
---|
2770 | else |
---|
2771 | { |
---|
2772 | valid_req = true; |
---|
2773 | } |
---|
2774 | } |
---|
2775 | else // tlb miss |
---|
2776 | { |
---|
2777 | valid_req = false; |
---|
2778 | r_dcache_tlb_vaddr = m_dreq.addr; |
---|
2779 | r_dcache_tlb_ins = false; |
---|
2780 | r_dcache_fsm = DCACHE_TLB_MISS; |
---|
2781 | } |
---|
2782 | } // end DTLB activated |
---|
2783 | |
---|
2784 | if (valid_req) // processor request is valid (after MMU check) |
---|
2785 | { |
---|
2786 | // READ request |
---|
2787 | // The read requests are taken only if there is no cache update. |
---|
2788 | // We request a VCI transaction to CMD FSM if miss or uncachable |
---|
2789 | |
---|
2790 | if (((m_dreq.type == iss_t::DATA_READ)) |
---|
2791 | and not r_dcache_updt_req.read()) |
---|
2792 | { |
---|
2793 | if (cacheable) // cacheable read |
---|
2794 | { |
---|
2795 | if (cache_state == CACHE_SLOT_STATE_EMPTY) // cache miss |
---|
2796 | { |
---|
2797 | #ifdef INSTRUMENTATION |
---|
2798 | m_cpt_dcache_miss++; |
---|
2799 | #endif |
---|
2800 | // request a VCI DMISS transaction |
---|
2801 | r_dcache_vci_paddr = paddr; |
---|
2802 | r_dcache_vci_miss_req = true; |
---|
2803 | r_dcache_miss_type = PROC_MISS; |
---|
2804 | r_dcache_fsm = DCACHE_MISS_SELECT; |
---|
2805 | #if DEBUG_DCACHE |
---|
2806 | if (m_debug_dcache_fsm) |
---|
2807 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2808 | << " READ MISS in dcache" |
---|
2809 | << " / PADDR = " << std::hex << paddr << std::endl; |
---|
2810 | #endif |
---|
2811 | } |
---|
2812 | else if (cache_state == CACHE_SLOT_STATE_ZOMBI) // pending cleanup |
---|
2813 | { |
---|
2814 | // stalled until cleanup is acknowledged |
---|
2815 | r_dcache_fsm = DCACHE_IDLE; |
---|
2816 | #if DEBUG_DCACHE |
---|
2817 | if (m_debug_dcache_fsm) |
---|
2818 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2819 | << " Pending cleanup, stalled until cleanup acknowledge" |
---|
2820 | << " / PADDR = " << std::hex << paddr << std::endl; |
---|
2821 | #endif |
---|
2822 | } |
---|
2823 | else // cache hit |
---|
2824 | { |
---|
2825 | #ifdef INSTRUMENTATION |
---|
2826 | m_cpt_data_read++; |
---|
2827 | #endif |
---|
2828 | // returns data to processor |
---|
2829 | m_drsp.valid = true; |
---|
2830 | m_drsp.error = false; |
---|
2831 | m_drsp.rdata = cache_rdata; |
---|
2832 | #if DEBUG_DCACHE |
---|
2833 | if (m_debug_dcache_fsm) |
---|
2834 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2835 | << " READ HIT in dcache" |
---|
2836 | << " : PADDR = " << std::hex << paddr |
---|
2837 | << " / DATA = " << std::hex << cache_rdata << std::endl; |
---|
2838 | #endif |
---|
2839 | } |
---|
2840 | } |
---|
2841 | else // uncacheable read |
---|
2842 | { |
---|
2843 | r_dcache_vci_paddr = paddr; |
---|
2844 | r_dcache_vci_unc_be = m_dreq.be; |
---|
2845 | r_dcache_vci_unc_write = false; |
---|
2846 | r_dcache_vci_unc_req = true; |
---|
2847 | r_dcache_fsm = DCACHE_UNC_WAIT; |
---|
2848 | #if DEBUG_DCACHE |
---|
2849 | if (m_debug_dcache_fsm) |
---|
2850 | std::cout << " <PROC " << name() << " DCACHE_IDLE>" |
---|
2851 | << " READ UNCACHEABLE in dcache" |
---|
2852 | << " / PADDR = " << std::hex << paddr << std::endl; |
---|
2853 | #endif |
---|
2854 | } |
---|
2855 | } // end READ |
---|
2856 | |
---|
2857 | // LL request (non cachable) |
---|
2858 | // We request a VCI LL transaction to CMD FSM and register |
---|
2859 | // the LL/SC operation in llsc buffer. |
---|
2860 | else if (m_dreq.type == iss_t::DATA_LL) |
---|
2861 | { |
---|
2862 | // register paddr in LLSC buffer |
---|
2863 | r_dcache_llsc_paddr = paddr; |
---|
2864 | r_dcache_llsc_count = LLSC_TIMEOUT; |
---|
2865 | r_dcache_llsc_valid = true; |
---|
2866 | |
---|
2867 | // request an LL VCI transaction and go to DCACHE_LL_WAIT state |
---|
2868 | r_dcache_vci_ll_req = true; |
---|
2869 | r_dcache_vci_paddr = paddr; |
---|
2870 | r_dcache_ll_rsp_count = 0; |
---|
2871 | r_dcache_fsm = DCACHE_LL_WAIT; |
---|
2872 | |
---|
2873 | }// end LL |
---|
2874 | |
---|
2875 | // WRITE request: |
---|
2876 | // If the TLB is activated and the PTE Dirty bit is not set, we stall |
---|
2877 | // the processor and set the Dirty bit before handling the write request, |
---|
2878 | // going to the DCACHE_DIRTY_GT_PTE state. |
---|
2879 | // If we don't need to set the Dirty bit, we can acknowledge |
---|
2880 | // the processor request, as the write arguments (including the |
---|
2881 | // physical address) are registered in r_dcache_save registers, |
---|
2882 | // and the write will be done in the P1 pipeline stage. |
---|
2883 | else if (m_dreq.type == iss_t::DATA_WRITE) |
---|
2884 | { |
---|
2885 | if ((r_mmu_mode.read() & DATA_TLB_MASK) |
---|
2886 | and not tlb_flags.d) // Dirty bit must be set |
---|
2887 | { |
---|
2888 | // The PTE physical address is obtained from the nline value (dtlb), |
---|
2889 | // and from the virtual address (word index) |
---|
2890 | if (tlb_flags.b ) // PTE1 |
---|
2891 | { |
---|
2892 | r_dcache_dirty_paddr = (paddr_t)(tlb_nline * (m_dcache_words << 2)) | |
---|
2893 | (paddr_t)((m_dreq.addr >> 19) & 0x3c); |
---|
2894 | } |
---|
2895 | else // PTE2 |
---|
2896 | { |
---|
2897 | r_dcache_dirty_paddr = (paddr_t) (tlb_nline * (m_dcache_words << 2)) | |
---|
2898 | (paddr_t) ((m_dreq.addr >> 9) & 0x38); |
---|
2899 | } |
---|
2900 | r_dcache_fsm = DCACHE_DIRTY_GET_PTE; |
---|
2901 | } |
---|
2902 | else // Write request accepted |
---|
2903 | { |
---|
2904 | #ifdef INSTRUMENTATION |
---|
2905 | m_cpt_data_write++; |
---|
2906 | #endif |
---|
2907 | // cleaning llsc buffer if address matching |
---|
2908 | if (paddr == r_dcache_llsc_paddr.read()) |
---|
2909 | r_dcache_llsc_valid = false; |
---|
2910 | |
---|
2911 | if (not cacheable) // uncacheable write |
---|
2912 | { |
---|
2913 | r_dcache_vci_paddr = paddr; |
---|
2914 | r_dcache_vci_wdata = m_dreq.wdata; |
---|
2915 | r_dcache_vci_unc_write = true; |
---|
2916 | r_dcache_vci_unc_be = m_dreq.be; |
---|
2917 | r_dcache_vci_unc_req = true; |
---|
2918 | r_dcache_fsm = DCACHE_UNC_WAIT; |
---|
2919 | } |
---|
2920 | else |
---|
2921 | { |
---|
2922 | // response to processor |
---|
2923 | m_drsp.valid = true; |
---|
2924 | // activating P1 stage |
---|
2925 | wbuf_request = true; |
---|
2926 | updt_request = (cache_state == CACHE_SLOT_STATE_VALID); |
---|
2927 | } |
---|
2928 | } |
---|
2929 | } // end WRITE |
---|
2930 | |
---|
2931 | // SC request: |
---|
2932 | // If the TLB is activated and the PTE Dirty bit is not set, we stall |
---|
2933 | // the processor and set the Dirty bit before handling the write request, |
---|
2934 | // going to the DCACHE_DIRTY_GT_PTE state. |
---|
2935 | // If we don't need to set the Dirty bit, we test the llsc buffer: |
---|
2936 | // If failure, we send a negative response to processor. |
---|
2937 | // If success, we request a SC transaction to CMD FSM and go |
---|
2938 | // to DCACHE_SC_WAIT state. |
---|
2939 | // We don't check a possible write hit in dcache, as the cache update |
---|
2940 | // is done by the coherence transaction induced by the SC... |
---|
2941 | else if (m_dreq.type == iss_t::DATA_SC) |
---|
2942 | { |
---|
2943 | if ((r_mmu_mode.read() & DATA_TLB_MASK) |
---|
2944 | and not tlb_flags.d) // Dirty bit must be set |
---|
2945 | { |
---|
2946 | // The PTE physical address is obtained from the nline value (dtlb), |
---|
2947 | // and the word index (virtual address) |
---|
2948 | if (tlb_flags.b) // PTE1 |
---|
2949 | { |
---|
2950 | r_dcache_dirty_paddr = (paddr_t) (tlb_nline * (m_dcache_words << 2)) | |
---|
2951 | (paddr_t) ((m_dreq.addr >> 19) & 0x3c); |
---|
2952 | } |
---|
2953 | else // PTE2 |
---|
2954 | { |
---|
2955 | r_dcache_dirty_paddr = (paddr_t) (tlb_nline * (m_dcache_words << 2)) | |
---|
2956 | (paddr_t) ((m_dreq.addr >> 9) & 0x38); |
---|
2957 | } |
---|
2958 | r_dcache_fsm = DCACHE_DIRTY_GET_PTE; |
---|
2959 | m_drsp.valid = false; |
---|
2960 | m_drsp.error = false; |
---|
2961 | m_drsp.rdata = 0; |
---|
2962 | } |
---|
2963 | else // SC request accepted |
---|
2964 | { |
---|
2965 | #ifdef INSTRUMENTATION |
---|
2966 | m_cpt_data_sc++; |
---|
2967 | #endif |
---|
2968 | // checking local success |
---|
2969 | if (r_dcache_llsc_valid.read() and |
---|
2970 | (r_dcache_llsc_paddr.read() == paddr)) // local success |
---|
2971 | { |
---|
2972 | // request an SC CMD and go to DCACHE_SC_WAIT state |
---|
2973 | r_dcache_vci_paddr = paddr; |
---|
2974 | r_dcache_vci_sc_req = true; |
---|
2975 | r_dcache_vci_sc_data = m_dreq.wdata; |
---|
2976 | r_dcache_fsm = DCACHE_SC_WAIT; |
---|
2977 | } |
---|
2978 | else // local fail |
---|
2979 | { |
---|
2980 | m_drsp.valid = true; |
---|
2981 | m_drsp.error = false; |
---|
2982 | m_drsp.rdata = 0x1; |
---|
2983 | } |
---|
2984 | } |
---|
2985 | } // end SC |
---|
2986 | } // end valid_req |
---|
2987 | } // end if read/write/ll/sc request |
---|
2988 | } // end processor request |
---|
2989 | |
---|
2990 | // itlb miss request |
---|
2991 | else if (r_icache_tlb_miss_req.read() and not wbuf_write_miss) |
---|
2992 | { |
---|
2993 | r_dcache_tlb_ins = true; |
---|
2994 | r_dcache_tlb_vaddr = r_icache_vaddr_save.read(); |
---|
2995 | r_dcache_fsm = DCACHE_TLB_MISS; |
---|
2996 | } |
---|
2997 | |
---|
2998 | // Computing requests for P1 stage : r_dcache_wbuf_req & r_dcache_updt_req |
---|
2999 | r_dcache_updt_req = updt_request; |
---|
3000 | r_dcache_wbuf_req = wbuf_request or |
---|
3001 | (r_dcache_wbuf_req.read() and wbuf_write_miss); |
---|
3002 | break; |
---|
3003 | } |
---|
3004 | ///////////////////// |
---|
3005 | case DCACHE_TLB_MISS: // This is the entry point for the sub-fsm handling all tlb miss. |
---|
3006 | // Input arguments are: |
---|
3007 | // - r_dcache_tlb_vaddr |
---|
3008 | // - r_dcache_tlb_ins (true when itlb miss) |
---|
3009 | // The sub-fsm access the dcache to find the missing TLB entry, |
---|
3010 | // and activates the cache miss procedure in case of miss. |
---|
3011 | // It bypass the first level page table access if possible. |
---|
3012 | // It uses atomic access to update the R/L access bits |
---|
3013 | // in the page table if required. |
---|
3014 | // It directly updates the itlb or dtlb, and writes into the |
---|
3015 | // r_mmu_ins_* or r_mmu_data* error reporting registers. |
---|
3016 | { |
---|
3017 | uint32_t ptba = 0; |
---|
3018 | bool bypass; |
---|
3019 | paddr_t pte_paddr; |
---|
3020 | |
---|
3021 | // evaluate bypass in order to skip first level page table access |
---|
3022 | if (r_dcache_tlb_ins.read()) // itlb miss |
---|
3023 | { |
---|
3024 | bypass = r_itlb.get_bypass(r_dcache_tlb_vaddr.read(), &ptba); |
---|
3025 | } |
---|
3026 | else // dtlb miss |
---|
3027 | { |
---|
3028 | bypass = r_dtlb.get_bypass(r_dcache_tlb_vaddr.read(), &ptba); |
---|
3029 | } |
---|
3030 | |
---|
3031 | if (not bypass) // Try to read PTE1/PTD1 in dcache |
---|
3032 | { |
---|
3033 | pte_paddr = (((paddr_t) r_mmu_ptpr.read()) << (INDEX1_NBITS + 2)) | |
---|
3034 | ((((paddr_t) r_dcache_tlb_vaddr.read()) >> PAGE_M_NBITS) << 2); |
---|
3035 | r_dcache_tlb_paddr = pte_paddr; |
---|
3036 | r_dcache_fsm = DCACHE_TLB_PTE1_GET; |
---|
3037 | } |
---|
3038 | else // Try to read PTE2 in dcache |
---|
3039 | { |
---|
3040 | pte_paddr = (paddr_t) ptba << PAGE_K_NBITS | |
---|
3041 | (paddr_t) (r_dcache_tlb_vaddr.read() & PTD_ID2_MASK) >> (PAGE_K_NBITS - 3); |
---|
3042 | r_dcache_tlb_paddr = pte_paddr; |
---|
3043 | r_dcache_fsm = DCACHE_TLB_PTE2_GET; |
---|
3044 | } |
---|
3045 | |
---|
3046 | #if DEBUG_DCACHE |
---|
3047 | if (m_debug_dcache_fsm) |
---|
3048 | { |
---|
3049 | if (r_dcache_tlb_ins.read()) |
---|
3050 | std::cout << " <PROC " << name() << " DCACHE_TLB_MISS> ITLB miss"; |
---|
3051 | else |
---|
3052 | std::cout << " <PROC " << name() << " DCACHE_TLB_MISS> DTLB miss"; |
---|
3053 | std::cout << " / VADDR = " << std::hex << r_dcache_tlb_vaddr.read() |
---|
3054 | << " / ptpr = " << (((paddr_t)r_mmu_ptpr.read()) << (INDEX1_NBITS+2)) |
---|
3055 | << " / BYPASS = " << bypass |
---|
3056 | << " / PTE_ADR = " << pte_paddr << std::endl; |
---|
3057 | } |
---|
3058 | #endif |
---|
3059 | |
---|
3060 | break; |
---|
3061 | } |
---|
3062 | ///////////////////////// |
---|
3063 | case DCACHE_TLB_PTE1_GET: // try to read a PT1 entry in dcache |
---|
3064 | { |
---|
3065 | // coherence clack request (from DSPIN CLACK) |
---|
3066 | if (r_dcache_clack_req.read()) |
---|
3067 | { |
---|
3068 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3069 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3070 | break; |
---|
3071 | } |
---|
3072 | |
---|
3073 | // coherence request (from CC_RECEIVE FSM) |
---|
3074 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3075 | { |
---|
3076 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3077 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3078 | break; |
---|
3079 | } |
---|
3080 | |
---|
3081 | uint32_t entry; |
---|
3082 | size_t way; |
---|
3083 | size_t set; |
---|
3084 | size_t word; |
---|
3085 | int cache_state; |
---|
3086 | r_dcache.read(r_dcache_tlb_paddr.read(), |
---|
3087 | &entry, |
---|
3088 | &way, |
---|
3089 | &set, |
---|
3090 | &word, |
---|
3091 | &cache_state); |
---|
3092 | #ifdef INSTRUMENTATION |
---|
3093 | m_cpt_dcache_data_read++; |
---|
3094 | m_cpt_dcache_dir_read++; |
---|
3095 | #endif |
---|
3096 | if (cache_state == CACHE_SLOT_STATE_VALID) // hit in dcache |
---|
3097 | { |
---|
3098 | if (not (entry & PTE_V_MASK)) // unmapped |
---|
3099 | { |
---|
3100 | if (r_dcache_tlb_ins.read()) |
---|
3101 | { |
---|
3102 | r_mmu_ietr = MMU_READ_PT1_UNMAPPED; |
---|
3103 | r_mmu_ibvar = r_dcache_tlb_vaddr.read(); |
---|
3104 | r_icache_tlb_miss_req = false; |
---|
3105 | r_icache_tlb_rsp_error = true; |
---|
3106 | } |
---|
3107 | else |
---|
3108 | { |
---|
3109 | r_mmu_detr = MMU_READ_PT1_UNMAPPED; |
---|
3110 | r_mmu_dbvar = r_dcache_tlb_vaddr.read(); |
---|
3111 | m_drsp.valid = true; |
---|
3112 | m_drsp.error = true; |
---|
3113 | } |
---|
3114 | r_dcache_fsm = DCACHE_IDLE; |
---|
3115 | |
---|
3116 | #if DEBUG_DCACHE |
---|
3117 | if (m_debug_dcache_fsm) |
---|
3118 | { |
---|
3119 | std::cout << " <PROC " << name() |
---|
3120 | << " DCACHE_TLB_PTE1_GET> HIT in dcache, but unmapped" |
---|
3121 | << std::hex << " / paddr = " << r_dcache_tlb_paddr.read() |
---|
3122 | << std::dec << " / way = " << way |
---|
3123 | << std::dec << " / set = " << set |
---|
3124 | << std::dec << " / word = " << word |
---|
3125 | << std::hex << " / PTE1 = " << entry << std::endl; |
---|
3126 | } |
---|
3127 | #endif |
---|
3128 | |
---|
3129 | } |
---|
3130 | else if (entry & PTE_T_MASK) // PTD : me must access PT2 |
---|
3131 | { |
---|
3132 | // mark the cache line ac containing a PTD |
---|
3133 | r_dcache_contains_ptd[m_dcache_sets * way + set] = true; |
---|
3134 | |
---|
3135 | // register bypass |
---|
3136 | if (r_dcache_tlb_ins.read()) // itlb |
---|
3137 | { |
---|
3138 | r_itlb.set_bypass(r_dcache_tlb_vaddr.read(), |
---|
3139 | entry & ((1 << (m_paddr_nbits-PAGE_K_NBITS)) - 1), |
---|
3140 | r_dcache_tlb_paddr.read() / (m_icache_words << 2)); |
---|
3141 | } |
---|
3142 | else // dtlb |
---|
3143 | { |
---|
3144 | r_dtlb.set_bypass(r_dcache_tlb_vaddr.read(), |
---|
3145 | entry & ((1 << (m_paddr_nbits-PAGE_K_NBITS)) - 1), |
---|
3146 | r_dcache_tlb_paddr.read() / (m_dcache_words << 2)); |
---|
3147 | } |
---|
3148 | r_dcache_tlb_paddr = |
---|
3149 | (paddr_t)(entry & ((1 << (m_paddr_nbits - PAGE_K_NBITS)) - 1)) << PAGE_K_NBITS | |
---|
3150 | (paddr_t)(((r_dcache_tlb_vaddr.read() & PTD_ID2_MASK) >> PAGE_K_NBITS) << 3); |
---|
3151 | r_dcache_fsm = DCACHE_TLB_PTE2_GET; |
---|
3152 | |
---|
3153 | #if DEBUG_DCACHE |
---|
3154 | if (m_debug_dcache_fsm) |
---|
3155 | { |
---|
3156 | std::cout << " <PROC " << name() |
---|
3157 | << " DCACHE_TLB_PTE1_GET> HIT in dcache" |
---|
3158 | << std::hex << " / paddr = " << r_dcache_tlb_paddr.read() |
---|
3159 | << std::dec << " / way = " << way |
---|
3160 | << std::dec << " / set = " << set |
---|
3161 | << std::dec << " / word = " << word |
---|
3162 | << std::hex << " / PTD = " << entry << std::endl; |
---|
3163 | } |
---|
3164 | #endif |
---|
3165 | } |
---|
3166 | else // PTE1 : we must update the TLB |
---|
3167 | { |
---|
3168 | r_dcache_in_tlb[m_icache_sets * way + set] = true; |
---|
3169 | r_dcache_tlb_pte_flags = entry; |
---|
3170 | r_dcache_tlb_cache_way = way; |
---|
3171 | r_dcache_tlb_cache_set = set; |
---|
3172 | r_dcache_tlb_cache_word = word; |
---|
3173 | r_dcache_fsm = DCACHE_TLB_PTE1_SELECT; |
---|
3174 | |
---|
3175 | #if DEBUG_DCACHE |
---|
3176 | if (m_debug_dcache_fsm) |
---|
3177 | { |
---|
3178 | std::cout << " <PROC " << name() |
---|
3179 | << " DCACHE_TLB_PTE1_GET> HIT in dcache" |
---|
3180 | << std::hex << " / paddr = " << r_dcache_tlb_paddr.read() |
---|
3181 | << std::dec << " / way = " << way |
---|
3182 | << std::dec << " / set = " << set |
---|
3183 | << std::dec << " / word = " << word |
---|
3184 | << std::hex << " / PTE1 = " << entry << std::endl; |
---|
3185 | } |
---|
3186 | #endif |
---|
3187 | } |
---|
3188 | } |
---|
3189 | else if (cache_state == CACHE_SLOT_STATE_ZOMBI) // pending cleanup |
---|
3190 | { |
---|
3191 | // stalled until cleanup is acknowledged |
---|
3192 | r_dcache_fsm = DCACHE_TLB_PTE1_GET; |
---|
3193 | } |
---|
3194 | else // we must load the missing cache line in dcache |
---|
3195 | { |
---|
3196 | r_dcache_vci_miss_req = true; |
---|
3197 | r_dcache_vci_paddr = r_dcache_tlb_paddr.read(); |
---|
3198 | r_dcache_save_paddr = r_dcache_tlb_paddr.read(); |
---|
3199 | r_dcache_miss_type = PTE1_MISS; |
---|
3200 | r_dcache_fsm = DCACHE_MISS_SELECT; |
---|
3201 | |
---|
3202 | #if DEBUG_DCACHE |
---|
3203 | if (m_debug_dcache_fsm) |
---|
3204 | { |
---|
3205 | std::cout << " <PROC " << name() |
---|
3206 | << " DCACHE_TLB_PTE1_GET> MISS in dcache:" |
---|
3207 | << " PTE1 address = " << std::hex << r_dcache_tlb_paddr.read() << std::endl; |
---|
3208 | } |
---|
3209 | #endif |
---|
3210 | } |
---|
3211 | break; |
---|
3212 | } |
---|
3213 | //////////////////////////// |
---|
3214 | case DCACHE_TLB_PTE1_SELECT: // select a slot for PTE1 |
---|
3215 | { |
---|
3216 | size_t way; |
---|
3217 | size_t set; |
---|
3218 | |
---|
3219 | if (r_dcache_tlb_ins.read()) |
---|
3220 | { |
---|
3221 | r_itlb.select(r_dcache_tlb_vaddr.read(), |
---|
3222 | true, // PTE1 |
---|
3223 | &way, |
---|
3224 | &set); |
---|
3225 | #ifdef INSTRUMENTATION |
---|
3226 | m_cpt_itlb_read++; |
---|
3227 | #endif |
---|
3228 | } |
---|
3229 | else |
---|
3230 | { |
---|
3231 | r_dtlb.select(r_dcache_tlb_vaddr.read(), |
---|
3232 | true, // PTE1 |
---|
3233 | &way, |
---|
3234 | &set); |
---|
3235 | #ifdef INSTRUMENTATION |
---|
3236 | m_cpt_dtlb_read++; |
---|
3237 | #endif |
---|
3238 | } |
---|
3239 | r_dcache_tlb_way = way; |
---|
3240 | r_dcache_tlb_set = set; |
---|
3241 | r_dcache_fsm = DCACHE_TLB_PTE1_UPDT; |
---|
3242 | |
---|
3243 | #if DEBUG_DCACHE |
---|
3244 | if (m_debug_dcache_fsm) |
---|
3245 | { |
---|
3246 | if (r_dcache_tlb_ins.read()) |
---|
3247 | std::cout << " <PROC " << name() |
---|
3248 | << " DCACHE_TLB_PTE1_SELECT> Select a slot in ITLB:"; |
---|
3249 | else |
---|
3250 | std::cout << " <PROC " << name() |
---|
3251 | << ".DCACHE_TLB_PTE1_SELECT> Select a slot in DTLB:"; |
---|
3252 | std::cout << " way = " << std::dec << way |
---|
3253 | << " / set = " << set << std::endl; |
---|
3254 | } |
---|
3255 | #endif |
---|
3256 | break; |
---|
3257 | } |
---|
3258 | ////////////////////////// |
---|
3259 | case DCACHE_TLB_PTE1_UPDT: // write a new PTE1 in tlb after testing the L/R bit |
---|
3260 | // - if L/R bit already set, exit the sub-fsm. |
---|
3261 | // - if not, we update the page table but we dont write |
---|
3262 | // neither in DCACHE, nor in TLB, as this will be done by |
---|
3263 | // the coherence mechanism. |
---|
3264 | { |
---|
3265 | paddr_t nline = r_dcache_tlb_paddr.read() >> (uint32_log2(m_dcache_words) + 2); |
---|
3266 | uint32_t pte = r_dcache_tlb_pte_flags.read(); |
---|
3267 | bool pt_updt = false; |
---|
3268 | bool local = true; |
---|
3269 | |
---|
3270 | // We should compute the access locality: |
---|
3271 | // The PPN MSB bits define the destination cluster index. |
---|
3272 | // The m_srcid MSB bits define the source cluster index. |
---|
3273 | // The number of bits to compare depends on the number of clusters, |
---|
3274 | // and can be obtained in the mapping table. |
---|
3275 | // As long as this computation is not done, all access are local. |
---|
3276 | |
---|
3277 | if (local) // local access |
---|
3278 | { |
---|
3279 | if (not ((pte & PTE_L_MASK) == PTE_L_MASK)) // we must set the L bit |
---|
3280 | { |
---|
3281 | pt_updt = true; |
---|
3282 | r_dcache_vci_cas_old = pte; |
---|
3283 | r_dcache_vci_cas_new = pte | PTE_L_MASK; |
---|
3284 | pte = pte | PTE_L_MASK; |
---|
3285 | r_dcache_tlb_pte_flags = pte; |
---|
3286 | } |
---|
3287 | } |
---|
3288 | else // remote access |
---|
3289 | { |
---|
3290 | if (not ((pte & PTE_R_MASK) == PTE_R_MASK)) // we must set the R bit |
---|
3291 | { |
---|
3292 | pt_updt = true; |
---|
3293 | r_dcache_vci_cas_old = pte; |
---|
3294 | r_dcache_vci_cas_new = pte | PTE_R_MASK; |
---|
3295 | pte = pte | PTE_R_MASK; |
---|
3296 | r_dcache_tlb_pte_flags = pte; |
---|
3297 | } |
---|
3298 | } |
---|
3299 | |
---|
3300 | if (not pt_updt) // update TLB and return |
---|
3301 | { |
---|
3302 | if (r_dcache_tlb_ins.read()) |
---|
3303 | { |
---|
3304 | r_itlb.write(true, // 2M page |
---|
3305 | pte, |
---|
3306 | 0, // argument unused for a PTE1 |
---|
3307 | r_dcache_tlb_vaddr.read(), |
---|
3308 | r_dcache_tlb_way.read(), |
---|
3309 | r_dcache_tlb_set.read(), |
---|
3310 | nline); |
---|
3311 | #ifdef INSTRUMENTATION |
---|
3312 | m_cpt_itlb_write++; |
---|
3313 | #endif |
---|
3314 | |
---|
3315 | #if DEBUG_DCACHE |
---|
3316 | if (m_debug_dcache_fsm) |
---|
3317 | { |
---|
3318 | std::cout << " <PROC " << name() |
---|
3319 | << " DCACHE_TLB_PTE1_UPDT> write PTE1 in ITLB" |
---|
3320 | << " / set = " << std::dec << r_dcache_tlb_set.read() |
---|
3321 | << " / way = " << r_dcache_tlb_way.read() << std::endl; |
---|
3322 | r_itlb.printTrace(); |
---|
3323 | } |
---|
3324 | #endif |
---|
3325 | } |
---|
3326 | else |
---|
3327 | { |
---|
3328 | r_dtlb.write(true, // 2M page |
---|
3329 | pte, |
---|
3330 | 0, // argument unused for a PTE1 |
---|
3331 | r_dcache_tlb_vaddr.read(), |
---|
3332 | r_dcache_tlb_way.read(), |
---|
3333 | r_dcache_tlb_set.read(), |
---|
3334 | nline); |
---|
3335 | #ifdef INSTRUMENTATION |
---|
3336 | m_cpt_dtlb_write++; |
---|
3337 | #endif |
---|
3338 | |
---|
3339 | #if DEBUG_DCACHE |
---|
3340 | if (m_debug_dcache_fsm) |
---|
3341 | { |
---|
3342 | std::cout << " <PROC " << name() |
---|
3343 | << " DCACHE_TLB_PTE1_UPDT> write PTE1 in DTLB" |
---|
3344 | << " / set = " << std::dec << r_dcache_tlb_set.read() |
---|
3345 | << " / way = " << r_dcache_tlb_way.read() << std::endl; |
---|
3346 | r_dtlb.printTrace(); |
---|
3347 | } |
---|
3348 | #endif |
---|
3349 | } |
---|
3350 | r_dcache_fsm = DCACHE_TLB_RETURN; |
---|
3351 | } |
---|
3352 | else // update page table but not TLB |
---|
3353 | { |
---|
3354 | r_dcache_fsm = DCACHE_TLB_LR_UPDT; |
---|
3355 | |
---|
3356 | #if DEBUG_DCACHE |
---|
3357 | if (m_debug_dcache_fsm) |
---|
3358 | { |
---|
3359 | std::cout << " <PROC " << name() |
---|
3360 | << " DCACHE_TLB_PTE1_UPDT> L/R bit update required" |
---|
3361 | << std::endl; |
---|
3362 | } |
---|
3363 | #endif |
---|
3364 | } |
---|
3365 | break; |
---|
3366 | } |
---|
3367 | ///////////////////////// |
---|
3368 | case DCACHE_TLB_PTE2_GET: // Try to get a PTE2 (64 bits) in the dcache |
---|
3369 | { |
---|
3370 | // coherence clack request (from DSPIN CLACK) |
---|
3371 | if (r_dcache_clack_req.read()) |
---|
3372 | { |
---|
3373 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3374 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3375 | break; |
---|
3376 | } |
---|
3377 | |
---|
3378 | // coherence request (from CC_RECEIVE FSM) |
---|
3379 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3380 | { |
---|
3381 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3382 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3383 | break; |
---|
3384 | } |
---|
3385 | |
---|
3386 | uint32_t pte_flags; |
---|
3387 | uint32_t pte_ppn; |
---|
3388 | size_t way; |
---|
3389 | size_t set; |
---|
3390 | size_t word; |
---|
3391 | int cache_state; |
---|
3392 | |
---|
3393 | r_dcache.read(r_dcache_tlb_paddr.read(), |
---|
3394 | &pte_flags, |
---|
3395 | &pte_ppn, |
---|
3396 | &way, |
---|
3397 | &set, |
---|
3398 | &word, |
---|
3399 | &cache_state); |
---|
3400 | #ifdef INSTRUMENTATION |
---|
3401 | m_cpt_dcache_data_read++; |
---|
3402 | m_cpt_dcache_dir_read++; |
---|
3403 | #endif |
---|
3404 | if (cache_state == CACHE_SLOT_STATE_VALID) // hit in dcache |
---|
3405 | { |
---|
3406 | if (not (pte_flags & PTE_V_MASK)) // unmapped |
---|
3407 | { |
---|
3408 | if (r_dcache_tlb_ins.read()) |
---|
3409 | { |
---|
3410 | r_mmu_ietr = MMU_READ_PT2_UNMAPPED; |
---|
3411 | r_mmu_ibvar = r_dcache_tlb_vaddr.read(); |
---|
3412 | r_icache_tlb_miss_req = false; |
---|
3413 | r_icache_tlb_rsp_error = true; |
---|
3414 | } |
---|
3415 | else |
---|
3416 | { |
---|
3417 | r_mmu_detr = MMU_READ_PT2_UNMAPPED; |
---|
3418 | r_mmu_dbvar = r_dcache_tlb_vaddr.read(); |
---|
3419 | m_drsp.valid = true; |
---|
3420 | m_drsp.error = true; |
---|
3421 | } |
---|
3422 | r_dcache_fsm = DCACHE_IDLE; |
---|
3423 | |
---|
3424 | #if DEBUG_DCACHE |
---|
3425 | if (m_debug_dcache_fsm) |
---|
3426 | { |
---|
3427 | std::cout << " <PROC " << name() |
---|
3428 | << " DCACHE_TLB_PTE2_GET> HIT in dcache, but PTE unmapped" |
---|
3429 | << " PTE_FLAGS = " << std::hex << pte_flags |
---|
3430 | << " PTE_PPN = " << std::hex << pte_ppn << std::endl; |
---|
3431 | } |
---|
3432 | #endif |
---|
3433 | } |
---|
3434 | else // mapped : we must update the TLB |
---|
3435 | { |
---|
3436 | r_dcache_in_tlb[m_dcache_sets * way + set] = true; |
---|
3437 | r_dcache_tlb_pte_flags = pte_flags; |
---|
3438 | r_dcache_tlb_pte_ppn = pte_ppn; |
---|
3439 | r_dcache_tlb_cache_way = way; |
---|
3440 | r_dcache_tlb_cache_set = set; |
---|
3441 | r_dcache_tlb_cache_word = word; |
---|
3442 | r_dcache_fsm = DCACHE_TLB_PTE2_SELECT; |
---|
3443 | |
---|
3444 | #if DEBUG_DCACHE |
---|
3445 | if (m_debug_dcache_fsm) |
---|
3446 | { |
---|
3447 | std::cout << " <PROC " << name() |
---|
3448 | << " DCACHE_TLB_PTE2_GET> HIT in dcache:" |
---|
3449 | << " PTE_FLAGS = " << std::hex << pte_flags |
---|
3450 | << " PTE_PPN = " << std::hex << pte_ppn << std::endl; |
---|
3451 | } |
---|
3452 | #endif |
---|
3453 | } |
---|
3454 | } |
---|
3455 | else if (cache_state == CACHE_SLOT_STATE_ZOMBI) // pending cleanup |
---|
3456 | { |
---|
3457 | // stalled until cleanup is acknowledged |
---|
3458 | r_dcache_fsm = DCACHE_TLB_PTE2_GET; |
---|
3459 | |
---|
3460 | #if DEBUG_DCACHE |
---|
3461 | if (m_debug_dcache_fsm) |
---|
3462 | { |
---|
3463 | std::cout << " <PROC " << name() |
---|
3464 | << " DCACHE_TLB_PTE2_GET> ZOMBI in dcache: waiting cleanup ack" |
---|
3465 | << std::endl; |
---|
3466 | } |
---|
3467 | #endif |
---|
3468 | } |
---|
3469 | else // we must load the missing cache line in dcache |
---|
3470 | { |
---|
3471 | r_dcache_fsm = DCACHE_MISS_SELECT; |
---|
3472 | r_dcache_vci_miss_req = true; |
---|
3473 | r_dcache_vci_paddr = r_dcache_tlb_paddr.read(); |
---|
3474 | r_dcache_save_paddr = r_dcache_tlb_paddr.read(); |
---|
3475 | r_dcache_miss_type = PTE2_MISS; |
---|
3476 | |
---|
3477 | #if DEBUG_DCACHE |
---|
3478 | if (m_debug_dcache_fsm) |
---|
3479 | { |
---|
3480 | std::cout << " <PROC " << name() |
---|
3481 | << " DCACHE_TLB_PTE2_GET> MISS in dcache:" |
---|
3482 | << " PTE address = " << std::hex << r_dcache_tlb_paddr.read() << std::endl; |
---|
3483 | } |
---|
3484 | #endif |
---|
3485 | } |
---|
3486 | break; |
---|
3487 | } |
---|
3488 | //////////////////////////// |
---|
3489 | case DCACHE_TLB_PTE2_SELECT: // select a slot for PTE2 |
---|
3490 | { |
---|
3491 | size_t way; |
---|
3492 | size_t set; |
---|
3493 | |
---|
3494 | if (r_dcache_tlb_ins.read()) |
---|
3495 | { |
---|
3496 | r_itlb.select(r_dcache_tlb_vaddr.read(), |
---|
3497 | false, // PTE2 |
---|
3498 | &way, |
---|
3499 | &set); |
---|
3500 | #ifdef INSTRUMENTATION |
---|
3501 | m_cpt_itlb_read++; |
---|
3502 | #endif |
---|
3503 | } |
---|
3504 | else |
---|
3505 | { |
---|
3506 | r_dtlb.select(r_dcache_tlb_vaddr.read(), |
---|
3507 | false, // PTE2 |
---|
3508 | &way, |
---|
3509 | &set); |
---|
3510 | #ifdef INSTRUMENTATION |
---|
3511 | m_cpt_dtlb_read++; |
---|
3512 | #endif |
---|
3513 | } |
---|
3514 | |
---|
3515 | #if DEBUG_DCACHE |
---|
3516 | if (m_debug_dcache_fsm) |
---|
3517 | { |
---|
3518 | if (r_dcache_tlb_ins.read()) |
---|
3519 | std::cout << " <PROC " << name() |
---|
3520 | << " DCACHE_TLB_PTE2_SELECT> Select a slot in ITLB:"; |
---|
3521 | else |
---|
3522 | std::cout << " <PROC " << name() |
---|
3523 | << " DCACHE_TLB_PTE2_SELECT> Select a slot in DTLB:"; |
---|
3524 | std::cout << " way = " << std::dec << way |
---|
3525 | << " / set = " << set << std::endl; |
---|
3526 | } |
---|
3527 | #endif |
---|
3528 | r_dcache_tlb_way = way; |
---|
3529 | r_dcache_tlb_set = set; |
---|
3530 | r_dcache_fsm = DCACHE_TLB_PTE2_UPDT; |
---|
3531 | break; |
---|
3532 | } |
---|
3533 | ////////////////////////// |
---|
3534 | case DCACHE_TLB_PTE2_UPDT: // write a new PTE2 in tlb after testing the L/R bit |
---|
3535 | // - if L/R bit already set, exit the sub-fsm. |
---|
3536 | // - if not, we update the page table but we dont write |
---|
3537 | // neither in DCACHE, nor in TLB, as this will be done by |
---|
3538 | // the coherence mechanism. |
---|
3539 | { |
---|
3540 | paddr_t nline = r_dcache_tlb_paddr.read() >> (uint32_log2(m_dcache_words) + 2); |
---|
3541 | uint32_t pte_flags = r_dcache_tlb_pte_flags.read(); |
---|
3542 | uint32_t pte_ppn = r_dcache_tlb_pte_ppn.read(); |
---|
3543 | bool pt_updt = false; |
---|
3544 | bool local = true; |
---|
3545 | |
---|
3546 | // We should compute the access locality: |
---|
3547 | // The PPN MSB bits define the destination cluster index. |
---|
3548 | // The m_srcid MSB bits define the source cluster index. |
---|
3549 | // The number of bits to compare depends on the number of clusters, |
---|
3550 | // and can be obtained in the mapping table. |
---|
3551 | // As long as this computation is not done, all access are local. |
---|
3552 | |
---|
3553 | if (local) // local access |
---|
3554 | { |
---|
3555 | if (not ((pte_flags & PTE_L_MASK) == PTE_L_MASK)) // we must set the L bit |
---|
3556 | { |
---|
3557 | pt_updt = true; |
---|
3558 | r_dcache_vci_cas_old = pte_flags; |
---|
3559 | r_dcache_vci_cas_new = pte_flags | PTE_L_MASK; |
---|
3560 | pte_flags = pte_flags | PTE_L_MASK; |
---|
3561 | r_dcache_tlb_pte_flags = pte_flags; |
---|
3562 | } |
---|
3563 | } |
---|
3564 | else // remote access |
---|
3565 | { |
---|
3566 | if (not ((pte_flags & PTE_R_MASK) == PTE_R_MASK)) // we must set the R bit |
---|
3567 | { |
---|
3568 | pt_updt = true; |
---|
3569 | r_dcache_vci_cas_old = pte_flags; |
---|
3570 | r_dcache_vci_cas_new = pte_flags | PTE_R_MASK; |
---|
3571 | pte_flags = pte_flags | PTE_R_MASK; |
---|
3572 | r_dcache_tlb_pte_flags = pte_flags; |
---|
3573 | } |
---|
3574 | } |
---|
3575 | |
---|
3576 | if (not pt_updt) // update TLB |
---|
3577 | { |
---|
3578 | if (r_dcache_tlb_ins.read()) |
---|
3579 | { |
---|
3580 | r_itlb.write( false, // 4K page |
---|
3581 | pte_flags, |
---|
3582 | pte_ppn, |
---|
3583 | r_dcache_tlb_vaddr.read(), |
---|
3584 | r_dcache_tlb_way.read(), |
---|
3585 | r_dcache_tlb_set.read(), |
---|
3586 | nline ); |
---|
3587 | #ifdef INSTRUMENTATION |
---|
3588 | m_cpt_itlb_write++; |
---|
3589 | #endif |
---|
3590 | |
---|
3591 | #if DEBUG_DCACHE |
---|
3592 | if (m_debug_dcache_fsm) |
---|
3593 | { |
---|
3594 | std::cout << " <PROC " << name() |
---|
3595 | << " DCACHE_TLB_PTE2_UPDT> write PTE2 in ITLB" |
---|
3596 | << " / set = " << std::dec << r_dcache_tlb_set.read() |
---|
3597 | << " / way = " << r_dcache_tlb_way.read() << std::endl; |
---|
3598 | r_itlb.printTrace(); |
---|
3599 | } |
---|
3600 | #endif |
---|
3601 | } |
---|
3602 | else |
---|
3603 | { |
---|
3604 | r_dtlb.write(false, // 4K page |
---|
3605 | pte_flags, |
---|
3606 | pte_ppn, |
---|
3607 | r_dcache_tlb_vaddr.read(), |
---|
3608 | r_dcache_tlb_way.read(), |
---|
3609 | r_dcache_tlb_set.read(), |
---|
3610 | nline); |
---|
3611 | #ifdef INSTRUMENTATION |
---|
3612 | m_cpt_dtlb_write++; |
---|
3613 | #endif |
---|
3614 | |
---|
3615 | #if DEBUG_DCACHE |
---|
3616 | if (m_debug_dcache_fsm) |
---|
3617 | { |
---|
3618 | std::cout << " <PROC " << name() |
---|
3619 | << " DCACHE_TLB_PTE2_UPDT> write PTE2 in DTLB" |
---|
3620 | << " / set = " << std::dec << r_dcache_tlb_set.read() |
---|
3621 | << " / way = " << r_dcache_tlb_way.read() << std::endl; |
---|
3622 | r_dtlb.printTrace(); |
---|
3623 | } |
---|
3624 | #endif |
---|
3625 | |
---|
3626 | } |
---|
3627 | r_dcache_fsm = DCACHE_TLB_RETURN; |
---|
3628 | } |
---|
3629 | else // update page table but not TLB |
---|
3630 | { |
---|
3631 | r_dcache_fsm = DCACHE_TLB_LR_UPDT; // dcache and page table update |
---|
3632 | |
---|
3633 | #if DEBUG_DCACHE |
---|
3634 | if (m_debug_dcache_fsm) |
---|
3635 | { |
---|
3636 | std::cout << " <PROC " << name() |
---|
3637 | << " DCACHE_TLB_PTE2_UPDT> L/R bit update required" << std::endl; |
---|
3638 | } |
---|
3639 | #endif |
---|
3640 | } |
---|
3641 | break; |
---|
3642 | } |
---|
3643 | //////////////////////// |
---|
3644 | case DCACHE_TLB_LR_UPDT: // request a CAS transaction to update L/R bit |
---|
3645 | { |
---|
3646 | #if DEBUG_DCACHE |
---|
3647 | if (m_debug_dcache_fsm) |
---|
3648 | { |
---|
3649 | std::cout << " <PROC " << name() |
---|
3650 | << " DCACHE_TLB_LR_UPDT> Update dcache: (L/R) bit" << std::endl; |
---|
3651 | } |
---|
3652 | #endif |
---|
3653 | // r_dcache_vci_cas_old & r_dcache_vci_cas_new registers are already set |
---|
3654 | r_dcache_vci_paddr = r_dcache_tlb_paddr.read(); |
---|
3655 | |
---|
3656 | // checking llsc reservation buffer |
---|
3657 | if (r_dcache_llsc_paddr.read() == r_dcache_tlb_paddr.read()) |
---|
3658 | r_dcache_llsc_valid = false; |
---|
3659 | |
---|
3660 | // request a CAS CMD and go to DCACHE_TLB_LR_WAIT state |
---|
3661 | r_dcache_vci_cas_req = true; |
---|
3662 | r_dcache_fsm = DCACHE_TLB_LR_WAIT; |
---|
3663 | break; |
---|
3664 | } |
---|
3665 | //////////////////////// |
---|
3666 | case DCACHE_TLB_LR_WAIT: // Waiting the response to SC transaction for DIRTY bit. |
---|
3667 | // We consume the response in rsp FIFO, |
---|
3668 | // and exit the sub-fsm, but we don't |
---|
3669 | // analyse the response, because we don't |
---|
3670 | // care if the L/R bit update is not done. |
---|
3671 | // We must take the coherence requests because |
---|
3672 | // there is a risk of dead-lock |
---|
3673 | |
---|
3674 | { |
---|
3675 | // coherence clack request (from DSPIN CLACK) |
---|
3676 | if (r_dcache_clack_req.read()) |
---|
3677 | { |
---|
3678 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3679 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3680 | break; |
---|
3681 | } |
---|
3682 | |
---|
3683 | // coherence request (from CC_RECEIVE FSM) |
---|
3684 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3685 | { |
---|
3686 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3687 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3688 | break; |
---|
3689 | } |
---|
3690 | |
---|
3691 | if (r_vci_rsp_data_error.read()) // bus error |
---|
3692 | { |
---|
3693 | std::cout << "BUS ERROR in DCACHE_TLB_LR_WAIT state" << std::endl; |
---|
3694 | std::cout << "This should not happen in this state" << std::endl; |
---|
3695 | exit(0); |
---|
3696 | } |
---|
3697 | else if (r_vci_rsp_fifo_dcache.rok()) // response available |
---|
3698 | { |
---|
3699 | #if DEBUG_DCACHE |
---|
3700 | if (m_debug_dcache_fsm) |
---|
3701 | { |
---|
3702 | std::cout << " <PROC " << name() |
---|
3703 | << " DCACHE_TLB_LR_WAIT> SC response received" << std::endl; |
---|
3704 | } |
---|
3705 | #endif |
---|
3706 | vci_rsp_fifo_dcache_get = true; |
---|
3707 | r_dcache_fsm = DCACHE_TLB_RETURN; |
---|
3708 | } |
---|
3709 | break; |
---|
3710 | } |
---|
3711 | /////////////////////// |
---|
3712 | case DCACHE_TLB_RETURN: // return to caller depending on tlb miss type |
---|
3713 | { |
---|
3714 | #if DEBUG_DCACHE |
---|
3715 | if (m_debug_dcache_fsm) |
---|
3716 | { |
---|
3717 | std::cout << " <PROC " << name() |
---|
3718 | << " DCACHE_TLB_RETURN> TLB MISS completed" << std::endl; |
---|
3719 | } |
---|
3720 | #endif |
---|
3721 | if (r_dcache_tlb_ins.read()) r_icache_tlb_miss_req = false; |
---|
3722 | r_dcache_fsm = DCACHE_IDLE; |
---|
3723 | break; |
---|
3724 | } |
---|
3725 | /////////////////////// |
---|
3726 | case DCACHE_XTN_SWITCH: // The r_ptpr registers must be written, |
---|
3727 | // and both itlb and dtlb must be flushed. |
---|
3728 | // Caution : the itlb miss requests must be taken |
---|
3729 | // to avoid dead-lock in case of simultaneous ITLB miss |
---|
3730 | // Caution : the clack and cc requests must be taken |
---|
3731 | // to avoid dead-lock |
---|
3732 | { |
---|
3733 | // coherence clack request (from DSPIN CLACK) |
---|
3734 | if (r_dcache_clack_req.read()) |
---|
3735 | { |
---|
3736 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3737 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3738 | break; |
---|
3739 | } |
---|
3740 | |
---|
3741 | // coherence request (from CC_RECEIVE FSM) |
---|
3742 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3743 | { |
---|
3744 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3745 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3746 | break; |
---|
3747 | } |
---|
3748 | |
---|
3749 | // itlb miss request |
---|
3750 | if (r_icache_tlb_miss_req.read()) |
---|
3751 | { |
---|
3752 | r_dcache_tlb_ins = true; |
---|
3753 | r_dcache_tlb_vaddr = r_icache_vaddr_save.read(); |
---|
3754 | r_dcache_fsm = DCACHE_TLB_MISS; |
---|
3755 | break; |
---|
3756 | } |
---|
3757 | |
---|
3758 | if (not r_dcache_xtn_req.read()) |
---|
3759 | { |
---|
3760 | r_dtlb.flush(); |
---|
3761 | r_mmu_ptpr = m_dreq.wdata; |
---|
3762 | r_dcache_fsm = DCACHE_IDLE; |
---|
3763 | m_drsp.valid = true; |
---|
3764 | } |
---|
3765 | break; |
---|
3766 | } |
---|
3767 | ///////////////////// |
---|
3768 | case DCACHE_XTN_SYNC: // waiting until write buffer empty |
---|
3769 | // The coherence request must be taken |
---|
3770 | // as there is a risk of dead-lock |
---|
3771 | { |
---|
3772 | // coherence clack request (from DSPIN CLACK) |
---|
3773 | if (r_dcache_clack_req.read()) |
---|
3774 | { |
---|
3775 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3776 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3777 | break; |
---|
3778 | } |
---|
3779 | |
---|
3780 | // coherence request (from CC_RECEIVE FSM) |
---|
3781 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3782 | { |
---|
3783 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3784 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3785 | break; |
---|
3786 | } |
---|
3787 | |
---|
3788 | if (r_wbuf.empty()) |
---|
3789 | { |
---|
3790 | m_drsp.valid = true; |
---|
3791 | r_dcache_fsm = DCACHE_IDLE; |
---|
3792 | } |
---|
3793 | break; |
---|
3794 | } |
---|
3795 | //////////////////////// |
---|
3796 | case DCACHE_XTN_IC_FLUSH: // Waiting completion of an XTN request to the ICACHE FSM |
---|
3797 | case DCACHE_XTN_IC_INVAL_VA: // Caution : the itlb miss requests must be taken |
---|
3798 | case DCACHE_XTN_IC_INVAL_PA: // because the XTN_ICACHE_INVAL request to icache |
---|
3799 | case DCACHE_XTN_IC_PADDR_EXT: // can generate an itlb miss, |
---|
3800 | case DCACHE_XTN_IT_INVAL: // and because it can exist a simultaneous ITLB miss |
---|
3801 | |
---|
3802 | { |
---|
3803 | // coherence clack request (from DSPIN CLACK) |
---|
3804 | if (r_dcache_clack_req.read()) |
---|
3805 | { |
---|
3806 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3807 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3808 | break; |
---|
3809 | } |
---|
3810 | |
---|
3811 | // coherence request (from CC_RECEIVE FSM) |
---|
3812 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3813 | { |
---|
3814 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3815 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3816 | break; |
---|
3817 | } |
---|
3818 | |
---|
3819 | // itlb miss request |
---|
3820 | if (r_icache_tlb_miss_req.read()) |
---|
3821 | { |
---|
3822 | r_dcache_tlb_ins = true; |
---|
3823 | r_dcache_tlb_vaddr = r_icache_vaddr_save.read(); |
---|
3824 | r_dcache_fsm = DCACHE_TLB_MISS; |
---|
3825 | break; |
---|
3826 | } |
---|
3827 | |
---|
3828 | // test if XTN request to icache completed |
---|
3829 | if (not r_dcache_xtn_req.read()) |
---|
3830 | { |
---|
3831 | r_dcache_fsm = DCACHE_IDLE; |
---|
3832 | m_drsp.valid = true; |
---|
3833 | } |
---|
3834 | break; |
---|
3835 | } |
---|
3836 | ///////////////////////// |
---|
3837 | case DCACHE_XTN_DC_FLUSH: // Invalidate sequencially all cache lines, using |
---|
3838 | // r_dcache_flush_count as a slot counter, |
---|
3839 | // looping in this state until all slots have been visited. |
---|
3840 | // It can require two cycles per slot: |
---|
3841 | // We test here the slot state, and make the actual inval |
---|
3842 | // (if line is valid) in DCACHE_XTN_DC_FLUSH_GO state. |
---|
3843 | // A cleanup request is generated for each valid line. |
---|
3844 | // returns to IDLE and flush TLBs when last slot |
---|
3845 | { |
---|
3846 | // coherence clack request (from DSPIN CLACK) |
---|
3847 | if (r_dcache_clack_req.read()) |
---|
3848 | { |
---|
3849 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3850 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3851 | break; |
---|
3852 | } |
---|
3853 | |
---|
3854 | // coherence request (from CC_RECEIVE FSM) |
---|
3855 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
3856 | { |
---|
3857 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
3858 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
3859 | break; |
---|
3860 | } |
---|
3861 | |
---|
3862 | if (not r_dcache_cc_send_req.read()) // blocked until previous cc_send request is sent |
---|
3863 | { |
---|
3864 | int state; |
---|
3865 | paddr_t tag; |
---|
3866 | size_t way = r_dcache_flush_count.read() / m_dcache_sets; |
---|
3867 | size_t set = r_dcache_flush_count.read() % m_dcache_sets; |
---|
3868 | |
---|
3869 | #ifdef INSTRUMENTATION |
---|
3870 | m_cpt_dcache_dir_read++; |
---|
3871 | #endif |
---|
3872 | r_dcache.read_dir(way, |
---|
3873 | set, |
---|
3874 | &tag, |
---|
3875 | &state); |
---|
3876 | |
---|
3877 | if (state == CACHE_SLOT_STATE_VALID) // inval required |
---|
3878 | { |
---|
3879 | // request cleanup |
---|
3880 | r_dcache_cc_send_req = true; |
---|
3881 | r_dcache_cc_send_nline = tag * m_dcache_sets + set; |
---|
3882 | r_dcache_cc_send_way = way; |
---|
3883 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
3884 | |
---|
3885 | // goes to DCACHE_XTN_DC_FLUSH_GO to inval directory |
---|
3886 | r_dcache_miss_way = way; |
---|
3887 | r_dcache_miss_set = set; |
---|
3888 | r_dcache_fsm = DCACHE_XTN_DC_FLUSH_GO; |
---|
3889 | } |
---|
3890 | else if (r_dcache_flush_count.read() == |
---|
3891 | (m_dcache_sets*m_dcache_ways - 1)) // last slot |
---|
3892 | { |
---|
3893 | r_dtlb.reset(); |
---|
3894 | r_itlb.reset(); |
---|
3895 | r_dcache_fsm = DCACHE_IDLE; |
---|
3896 | m_drsp.valid = true; |
---|
3897 | } |
---|
3898 | |
---|
3899 | // saturation counter |
---|
3900 | if (r_dcache_flush_count.read() < (m_dcache_sets * m_dcache_ways - 1)) |
---|
3901 | r_dcache_flush_count = r_dcache_flush_count.read() + 1; |
---|
3902 | } |
---|
3903 | break; |
---|
3904 | } |
---|
3905 | //////////////////////////// |
---|
3906 | case DCACHE_XTN_DC_FLUSH_GO: // Switch the cache slot to ZOMBI state |
---|
3907 | // and reset directory extension. |
---|
3908 | // returns to IDLE and flush TLBs when last slot |
---|
3909 | { |
---|
3910 | size_t way = r_dcache_miss_way.read(); |
---|
3911 | size_t set = r_dcache_miss_set.read(); |
---|
3912 | |
---|
3913 | r_dcache_in_tlb[m_dcache_sets * way + set] = false; |
---|
3914 | r_dcache_contains_ptd[m_dcache_sets * way + set] = false; |
---|
3915 | |
---|
3916 | #ifdef INSTRUMENTATION |
---|
3917 | m_cpt_dcache_dir_write++; |
---|
3918 | #endif |
---|
3919 | r_dcache.write_dir(way, |
---|
3920 | set, |
---|
3921 | CACHE_SLOT_STATE_ZOMBI); |
---|
3922 | |
---|
3923 | if (r_dcache_flush_count.read() == |
---|
3924 | (m_dcache_sets*m_dcache_ways - 1)) // last slot |
---|
3925 | { |
---|
3926 | r_dtlb.reset(); |
---|
3927 | r_itlb.reset(); |
---|
3928 | r_dcache_fsm = DCACHE_IDLE; |
---|
3929 | m_drsp.valid = true; |
---|
3930 | } |
---|
3931 | else |
---|
3932 | { |
---|
3933 | r_dcache_fsm = DCACHE_XTN_DC_FLUSH; |
---|
3934 | } |
---|
3935 | break; |
---|
3936 | } |
---|
3937 | ///////////////////////// |
---|
3938 | case DCACHE_XTN_DT_INVAL: // handling processor XTN_DTLB_INVAL request |
---|
3939 | { |
---|
3940 | r_dtlb.inval(r_dcache_save_wdata.read()); |
---|
3941 | r_dcache_fsm = DCACHE_IDLE; |
---|
3942 | m_drsp.valid = true; |
---|
3943 | break; |
---|
3944 | } |
---|
3945 | //////////////////////////// |
---|
3946 | case DCACHE_XTN_DC_INVAL_VA: // selective cache line invalidate with virtual address |
---|
3947 | // requires 3 cycles: access tlb, read cache, inval cache |
---|
3948 | // we compute the physical address in this state |
---|
3949 | { |
---|
3950 | paddr_t paddr; |
---|
3951 | bool hit; |
---|
3952 | |
---|
3953 | if (r_mmu_mode.read() & DATA_TLB_MASK) // dtlb activated |
---|
3954 | { |
---|
3955 | |
---|
3956 | #ifdef INSTRUMENTATION |
---|
3957 | m_cpt_dtlb_read++; |
---|
3958 | #endif |
---|
3959 | hit = r_dtlb.translate(r_dcache_save_wdata.read(), |
---|
3960 | &paddr); |
---|
3961 | } |
---|
3962 | else // dtlb not activated |
---|
3963 | { |
---|
3964 | paddr = (paddr_t)r_dcache_save_wdata.read(); |
---|
3965 | if (vci_param::N > 32) |
---|
3966 | paddr = paddr | ((paddr_t)(r_dcache_paddr_ext.read()) << 32); |
---|
3967 | hit = true; |
---|
3968 | } |
---|
3969 | |
---|
3970 | if (hit) // tlb hit |
---|
3971 | { |
---|
3972 | r_dcache_save_paddr = paddr; |
---|
3973 | r_dcache_fsm = DCACHE_XTN_DC_INVAL_PA; |
---|
3974 | } |
---|
3975 | else // tlb miss |
---|
3976 | { |
---|
3977 | |
---|
3978 | #ifdef INSTRUMENTATION |
---|
3979 | m_cpt_dtlb_miss++; |
---|
3980 | #endif |
---|
3981 | r_dcache_tlb_ins = false; // dtlb |
---|
3982 | r_dcache_tlb_vaddr = r_dcache_save_wdata.read(); |
---|
3983 | r_dcache_fsm = DCACHE_TLB_MISS; |
---|
3984 | } |
---|
3985 | |
---|
3986 | #if DEBUG_DCACHE |
---|
3987 | if (m_debug_dcache_fsm) |
---|
3988 | { |
---|
3989 | std::cout << " <PROC " << name() |
---|
3990 | << " DCACHE_XTN_DC_INVAL_VA> Compute physical address" << std::hex |
---|
3991 | << " / VADDR = " << r_dcache_save_wdata.read() |
---|
3992 | << " / PADDR = " << paddr << std::endl; |
---|
3993 | } |
---|
3994 | #endif |
---|
3995 | |
---|
3996 | break; |
---|
3997 | } |
---|
3998 | //////////////////////////// |
---|
3999 | case DCACHE_XTN_DC_INVAL_PA: // selective cache line invalidate with physical address |
---|
4000 | // requires 2 cycles: read cache / inval cache |
---|
4001 | // In this state we read dcache. |
---|
4002 | { |
---|
4003 | size_t way; |
---|
4004 | size_t set; |
---|
4005 | size_t word; |
---|
4006 | int state; |
---|
4007 | |
---|
4008 | #ifdef INSTRUMENTATION |
---|
4009 | m_cpt_dcache_dir_read++; |
---|
4010 | #endif |
---|
4011 | r_dcache.read_dir(r_dcache_save_paddr.read(), |
---|
4012 | &state, |
---|
4013 | &way, |
---|
4014 | &set, |
---|
4015 | &word); |
---|
4016 | |
---|
4017 | if (state == CACHE_SLOT_STATE_VALID) // inval to be done |
---|
4018 | { |
---|
4019 | r_dcache_xtn_way = way; |
---|
4020 | r_dcache_xtn_set = set; |
---|
4021 | r_dcache_fsm = DCACHE_XTN_DC_INVAL_GO; |
---|
4022 | } |
---|
4023 | else // miss : nothing to do |
---|
4024 | { |
---|
4025 | r_dcache_fsm = DCACHE_IDLE; |
---|
4026 | m_drsp.valid = true; |
---|
4027 | } |
---|
4028 | |
---|
4029 | #if DEBUG_DCACHE |
---|
4030 | if (m_debug_dcache_fsm) |
---|
4031 | { |
---|
4032 | std::cout << " <PROC " << name() |
---|
4033 | << " DCACHE_XTN_DC_INVAL_PA> Test hit in dcache" << std::hex |
---|
4034 | << " / PADDR = " << r_dcache_save_paddr.read() << std::dec |
---|
4035 | << " / HIT = " << (state == CACHE_SLOT_STATE_VALID) |
---|
4036 | << " / SET = " << set |
---|
4037 | << " / WAY = " << way << std::endl; |
---|
4038 | } |
---|
4039 | #endif |
---|
4040 | break; |
---|
4041 | } |
---|
4042 | //////////////////////////// |
---|
4043 | case DCACHE_XTN_DC_INVAL_GO: // In this state, we invalidate the cache line |
---|
4044 | // Blocked if previous cleanup not completed |
---|
4045 | // Test if itlb or dtlb inval is required |
---|
4046 | { |
---|
4047 | if (not r_dcache_cc_send_req.read()) // blocked until previous cc_send request is sent |
---|
4048 | { |
---|
4049 | size_t way = r_dcache_xtn_way.read(); |
---|
4050 | size_t set = r_dcache_xtn_set.read(); |
---|
4051 | paddr_t nline = r_dcache_save_paddr.read() / (m_dcache_words << 2); |
---|
4052 | |
---|
4053 | #ifdef INSTRUMENTATION |
---|
4054 | m_cpt_dcache_dir_write++; |
---|
4055 | #endif |
---|
4056 | r_dcache.write_dir(way, |
---|
4057 | set, |
---|
4058 | CACHE_SLOT_STATE_ZOMBI); |
---|
4059 | |
---|
4060 | // request cleanup |
---|
4061 | r_dcache_cc_send_req = true; |
---|
4062 | r_dcache_cc_send_nline = nline; |
---|
4063 | r_dcache_cc_send_way = way; |
---|
4064 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4065 | |
---|
4066 | // possible itlb & dtlb invalidate |
---|
4067 | if (r_dcache_in_tlb[way * m_dcache_sets + set]) |
---|
4068 | { |
---|
4069 | r_dcache_tlb_inval_line = nline; |
---|
4070 | r_dcache_tlb_inval_set = 0; |
---|
4071 | r_dcache_fsm_scan_save = DCACHE_XTN_DC_INVAL_END; |
---|
4072 | r_dcache_fsm = DCACHE_INVAL_TLB_SCAN; |
---|
4073 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
4074 | } |
---|
4075 | else if (r_dcache_contains_ptd[way * m_dcache_sets + set]) |
---|
4076 | { |
---|
4077 | r_itlb.reset(); |
---|
4078 | r_dtlb.reset(); |
---|
4079 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
4080 | r_dcache_fsm = DCACHE_IDLE; |
---|
4081 | m_drsp.valid = true; |
---|
4082 | } |
---|
4083 | else |
---|
4084 | { |
---|
4085 | r_dcache_fsm = DCACHE_IDLE; |
---|
4086 | m_drsp.valid = true; |
---|
4087 | } |
---|
4088 | |
---|
4089 | #if DEBUG_DCACHE |
---|
4090 | if (m_debug_dcache_fsm) |
---|
4091 | { |
---|
4092 | std::cout << " <PROC " << name() |
---|
4093 | << " DCACHE_XTN_DC_INVAL_GO> Actual dcache inval" << std::hex |
---|
4094 | << " / PADDR = " << r_dcache_save_paddr.read() << std::endl; |
---|
4095 | } |
---|
4096 | #endif |
---|
4097 | } |
---|
4098 | break; |
---|
4099 | } |
---|
4100 | ////////////////////////////// |
---|
4101 | case DCACHE_XTN_DC_INVAL_END: // send response to processor XTN request |
---|
4102 | { |
---|
4103 | r_dcache_fsm = DCACHE_IDLE; |
---|
4104 | m_drsp.valid = true; |
---|
4105 | break; |
---|
4106 | } |
---|
4107 | //////////////////////// |
---|
4108 | case DCACHE_MISS_SELECT: // Try to select a slot in associative set, |
---|
4109 | // Waiting in this state if no slot available. |
---|
4110 | // If a victim slot has been choosen and the r_icache_cc_send_req is false, |
---|
4111 | // we send the cleanup request in this state. |
---|
4112 | // If not, a r_icache_cleanup_victim_req flip-flop is |
---|
4113 | // utilized for saving this cleanup request, and it will be sent later |
---|
4114 | // in state ICACHE_MISS_WAIT or ICACHE_MISS_UPDT_DIR. |
---|
4115 | // The r_icache_miss_clack flip-flop is set |
---|
4116 | // when a cleanup is required |
---|
4117 | { |
---|
4118 | if (m_dreq.valid) m_cost_data_miss_frz++; |
---|
4119 | |
---|
4120 | // coherence clack request (from DSPIN CLACK) |
---|
4121 | if (r_dcache_clack_req.read()) |
---|
4122 | { |
---|
4123 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4124 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4125 | break; |
---|
4126 | } |
---|
4127 | |
---|
4128 | // coherence request (from CC_RECEIVE FSM) |
---|
4129 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
4130 | { |
---|
4131 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4132 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4133 | break; |
---|
4134 | } |
---|
4135 | |
---|
4136 | bool found = false; |
---|
4137 | bool cleanup = false; |
---|
4138 | size_t way = 0; |
---|
4139 | size_t set = 0; |
---|
4140 | paddr_t victim = 0; |
---|
4141 | |
---|
4142 | #ifdef INSTRUMENTATION |
---|
4143 | m_cpt_dcache_dir_read++; |
---|
4144 | #endif |
---|
4145 | r_dcache.read_select(r_dcache_save_paddr.read(), |
---|
4146 | &victim, |
---|
4147 | &way, |
---|
4148 | &set, |
---|
4149 | &found, |
---|
4150 | &cleanup); |
---|
4151 | |
---|
4152 | if (not found) |
---|
4153 | { |
---|
4154 | break; |
---|
4155 | } |
---|
4156 | else |
---|
4157 | { |
---|
4158 | r_dcache_miss_way = way; |
---|
4159 | r_dcache_miss_set = set; |
---|
4160 | |
---|
4161 | // reset to 0 the miss watchdog timer |
---|
4162 | r_dcache_miss_wdt = 0; |
---|
4163 | |
---|
4164 | if (cleanup) |
---|
4165 | { |
---|
4166 | if (not r_dcache_cc_send_req.read()) |
---|
4167 | { |
---|
4168 | r_dcache_cc_send_req = true; |
---|
4169 | r_dcache_cc_send_nline = victim; |
---|
4170 | r_dcache_cc_send_way = way; |
---|
4171 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4172 | |
---|
4173 | } |
---|
4174 | else |
---|
4175 | { |
---|
4176 | r_dcache_cleanup_victim_req = true; |
---|
4177 | r_dcache_cleanup_victim_nline = victim; |
---|
4178 | } |
---|
4179 | |
---|
4180 | r_dcache_miss_clack = true; |
---|
4181 | r_dcache_fsm = DCACHE_MISS_CLEAN; |
---|
4182 | } |
---|
4183 | else |
---|
4184 | { |
---|
4185 | r_dcache_fsm = DCACHE_MISS_WAIT; |
---|
4186 | } |
---|
4187 | |
---|
4188 | #if DEBUG_DCACHE |
---|
4189 | if (m_debug_dcache_fsm) |
---|
4190 | { |
---|
4191 | std::cout << " <PROC " << name() |
---|
4192 | << " DCACHE_MISS_SELECT> Select a slot:" << std::dec |
---|
4193 | << " / WAY = " << way |
---|
4194 | << " / SET = " << set |
---|
4195 | << " / PADDR = " << std::hex << r_dcache_save_paddr.read(); |
---|
4196 | if (cleanup) std::cout << " / VICTIM = " << (victim*m_dcache_words*4) << std::endl; |
---|
4197 | else std::cout << std::endl; |
---|
4198 | } |
---|
4199 | #endif |
---|
4200 | } // end found |
---|
4201 | break; |
---|
4202 | } |
---|
4203 | /////////////////////// |
---|
4204 | case DCACHE_MISS_CLEAN: // switch the slot to ZOMBI state |
---|
4205 | // and possibly request itlb or dtlb invalidate |
---|
4206 | { |
---|
4207 | if (m_dreq.valid) m_cost_data_miss_frz++; |
---|
4208 | |
---|
4209 | size_t way = r_dcache_miss_way.read(); |
---|
4210 | size_t set = r_dcache_miss_set.read(); |
---|
4211 | |
---|
4212 | #ifdef INSTRUMENTATION |
---|
4213 | m_cpt_dcache_dir_read++; |
---|
4214 | #endif |
---|
4215 | r_dcache.write_dir(way, |
---|
4216 | set, |
---|
4217 | CACHE_SLOT_STATE_ZOMBI); |
---|
4218 | #if DEBUG_DCACHE |
---|
4219 | if (m_debug_dcache_fsm) |
---|
4220 | { |
---|
4221 | std::cout << " <PROC " << name() |
---|
4222 | << " DCACHE_MISS_CLEAN> Switch to ZOMBI state" << std::dec |
---|
4223 | << " / way = " << way |
---|
4224 | << " / set = " << set << std::endl; |
---|
4225 | } |
---|
4226 | #endif |
---|
4227 | // if selective itlb & dtlb invalidate are required |
---|
4228 | // the miss response is not handled before invalidate completed |
---|
4229 | if (r_dcache_in_tlb[way * m_dcache_sets + set]) |
---|
4230 | { |
---|
4231 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
4232 | |
---|
4233 | if (not r_dcache_cleanup_victim_req.read()) |
---|
4234 | r_dcache_tlb_inval_line = r_dcache_cc_send_nline.read(); |
---|
4235 | else |
---|
4236 | r_dcache_tlb_inval_line = r_dcache_cleanup_victim_nline.read(); |
---|
4237 | |
---|
4238 | r_dcache_tlb_inval_set = 0; |
---|
4239 | r_dcache_fsm_scan_save = DCACHE_MISS_WAIT; |
---|
4240 | r_dcache_fsm = DCACHE_INVAL_TLB_SCAN; |
---|
4241 | } |
---|
4242 | else if (r_dcache_contains_ptd[way * m_dcache_sets + set]) |
---|
4243 | { |
---|
4244 | r_itlb.reset(); |
---|
4245 | r_dtlb.reset(); |
---|
4246 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
4247 | r_dcache_fsm = DCACHE_MISS_WAIT; |
---|
4248 | } |
---|
4249 | else |
---|
4250 | { |
---|
4251 | r_dcache_fsm = DCACHE_MISS_WAIT; |
---|
4252 | } |
---|
4253 | break; |
---|
4254 | } |
---|
4255 | ////////////////////// |
---|
4256 | case DCACHE_MISS_WAIT: // waiting the response to a miss request from VCI_RSP FSM |
---|
4257 | // This state is in charge of error signaling |
---|
4258 | // There is 5 types of error depending on the requester |
---|
4259 | { |
---|
4260 | if (m_dreq.valid) m_cost_data_miss_frz++; |
---|
4261 | |
---|
4262 | // send cleanup victim request |
---|
4263 | if (r_dcache_cleanup_victim_req.read() and not r_dcache_cc_send_req.read()) |
---|
4264 | { |
---|
4265 | r_dcache_cc_send_req = true; |
---|
4266 | r_dcache_cc_send_nline = r_dcache_cleanup_victim_nline; |
---|
4267 | r_dcache_cc_send_way = r_dcache_miss_way; |
---|
4268 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4269 | r_dcache_cleanup_victim_req = false; |
---|
4270 | } |
---|
4271 | |
---|
4272 | // coherence clack request (from DSPIN CLACK) |
---|
4273 | if (r_dcache_clack_req.read()) |
---|
4274 | { |
---|
4275 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4276 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4277 | break; |
---|
4278 | } |
---|
4279 | |
---|
4280 | // coherence request (from CC_RECEIVE FSM) |
---|
4281 | if (r_cc_receive_dcache_req.read() and |
---|
4282 | not r_dcache_cc_send_req.read() and |
---|
4283 | not r_dcache_cleanup_victim_req.read()) |
---|
4284 | { |
---|
4285 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4286 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4287 | break; |
---|
4288 | } |
---|
4289 | |
---|
4290 | // increment MISS watchdog timer for black-hole detection |
---|
4291 | r_dcache_miss_wdt = r_dcache_miss_wdt.read() + 1; |
---|
4292 | if (r_dcache_miss_wdt.read() == r_dcache_miss_wdt_max.read()) { |
---|
4293 | r_mmu_detr = MMU_READ_DATA_TIMEOUT; |
---|
4294 | r_mmu_dbvar = r_dcache_save_vaddr.read(); |
---|
4295 | m_drsp.valid = true; |
---|
4296 | m_drsp.error = true; |
---|
4297 | r_dcache_fsm = DCACHE_IDLE; |
---|
4298 | break; |
---|
4299 | } |
---|
4300 | |
---|
4301 | if (r_vci_rsp_data_error.read()) // bus error |
---|
4302 | { |
---|
4303 | switch (r_dcache_miss_type.read()) |
---|
4304 | { |
---|
4305 | case PROC_MISS: |
---|
4306 | { |
---|
4307 | r_mmu_detr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
4308 | r_mmu_dbvar = r_dcache_save_vaddr.read(); |
---|
4309 | m_drsp.valid = true; |
---|
4310 | m_drsp.error = true; |
---|
4311 | r_dcache_fsm = DCACHE_IDLE; |
---|
4312 | break; |
---|
4313 | } |
---|
4314 | case PTE1_MISS: |
---|
4315 | { |
---|
4316 | if (r_dcache_tlb_ins.read()) |
---|
4317 | { |
---|
4318 | r_mmu_ietr = MMU_READ_PT1_ILLEGAL_ACCESS; |
---|
4319 | r_mmu_ibvar = r_dcache_tlb_vaddr.read(); |
---|
4320 | r_icache_tlb_miss_req = false; |
---|
4321 | r_icache_tlb_rsp_error = true; |
---|
4322 | } |
---|
4323 | else |
---|
4324 | { |
---|
4325 | r_mmu_detr = MMU_READ_PT1_ILLEGAL_ACCESS; |
---|
4326 | r_mmu_dbvar = r_dcache_tlb_vaddr.read(); |
---|
4327 | m_drsp.valid = true; |
---|
4328 | m_drsp.error = true; |
---|
4329 | } |
---|
4330 | r_dcache_fsm = DCACHE_IDLE; |
---|
4331 | break; |
---|
4332 | } |
---|
4333 | case PTE2_MISS: |
---|
4334 | { |
---|
4335 | if (r_dcache_tlb_ins.read()) |
---|
4336 | { |
---|
4337 | r_mmu_ietr = MMU_READ_PT2_ILLEGAL_ACCESS; |
---|
4338 | r_mmu_ibvar = r_dcache_tlb_vaddr.read(); |
---|
4339 | r_icache_tlb_miss_req = false; |
---|
4340 | r_icache_tlb_rsp_error = true; |
---|
4341 | } |
---|
4342 | else |
---|
4343 | { |
---|
4344 | r_mmu_detr = MMU_READ_PT2_ILLEGAL_ACCESS; |
---|
4345 | r_mmu_dbvar = r_dcache_tlb_vaddr.read(); |
---|
4346 | m_drsp.valid = true; |
---|
4347 | m_drsp.error = true; |
---|
4348 | } |
---|
4349 | r_dcache_fsm = DCACHE_IDLE; |
---|
4350 | break; |
---|
4351 | } |
---|
4352 | } // end switch type |
---|
4353 | r_vci_rsp_data_error = false; |
---|
4354 | } |
---|
4355 | else if (r_vci_rsp_fifo_dcache.rok()) // valid response available |
---|
4356 | { |
---|
4357 | r_dcache_miss_word = 0; |
---|
4358 | r_dcache_fsm = DCACHE_MISS_DATA_UPDT; |
---|
4359 | } |
---|
4360 | break; |
---|
4361 | } |
---|
4362 | ////////////////////////// |
---|
4363 | case DCACHE_MISS_DATA_UPDT: // update the dcache (one word per cycle) |
---|
4364 | { |
---|
4365 | if (m_dreq.valid) m_cost_data_miss_frz++; |
---|
4366 | |
---|
4367 | if (r_vci_rsp_fifo_dcache.rok()) // one word available |
---|
4368 | { |
---|
4369 | #ifdef INSTRUMENTATION |
---|
4370 | m_cpt_dcache_data_write++; |
---|
4371 | #endif |
---|
4372 | r_dcache.write(r_dcache_miss_way.read(), |
---|
4373 | r_dcache_miss_set.read(), |
---|
4374 | r_dcache_miss_word.read(), |
---|
4375 | r_vci_rsp_fifo_dcache.read()); |
---|
4376 | #if DEBUG_DCACHE |
---|
4377 | if (m_debug_dcache_fsm) |
---|
4378 | { |
---|
4379 | std::cout << " <PROC " << name() |
---|
4380 | << " DCACHE_MISS_DATA_UPDT> Write one word:" |
---|
4381 | << " / DATA = " << std::hex << r_vci_rsp_fifo_dcache.read() |
---|
4382 | << " / WAY = " << std::dec << r_dcache_miss_way.read() |
---|
4383 | << " / SET = " << r_dcache_miss_set.read() |
---|
4384 | << " / WORD = " << r_dcache_miss_word.read() << std::endl; |
---|
4385 | } |
---|
4386 | #endif |
---|
4387 | vci_rsp_fifo_dcache_get = true; |
---|
4388 | r_dcache_miss_word = r_dcache_miss_word.read() + 1; |
---|
4389 | |
---|
4390 | if (r_dcache_miss_word.read() == (m_dcache_words - 1)) // last word |
---|
4391 | { |
---|
4392 | r_dcache_fsm = DCACHE_MISS_DIR_UPDT; |
---|
4393 | } |
---|
4394 | } |
---|
4395 | break; |
---|
4396 | } |
---|
4397 | ////////////////////////// |
---|
4398 | case DCACHE_MISS_DIR_UPDT: // Stalled if a victim line has been evicted |
---|
4399 | // and the cleanup ack has not been received, |
---|
4400 | // as indicated by the r_dcache_miss clack. |
---|
4401 | // - If no matching coherence request (r_dcache_inval_miss) |
---|
4402 | // switch directory slot to VALID state. |
---|
4403 | // - If matching coherence request, switch directory slot |
---|
4404 | // to ZOMBI state, and send a cleanup request. |
---|
4405 | { |
---|
4406 | if (m_dreq.valid) m_cost_data_miss_frz++; |
---|
4407 | |
---|
4408 | // send cleanup victim request |
---|
4409 | if (r_dcache_cleanup_victim_req.read() and not r_dcache_cc_send_req.read()) |
---|
4410 | { |
---|
4411 | r_dcache_cc_send_req = true; |
---|
4412 | r_dcache_cc_send_nline = r_dcache_cleanup_victim_nline; |
---|
4413 | r_dcache_cc_send_way = r_dcache_miss_way; |
---|
4414 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4415 | r_dcache_cleanup_victim_req = false; |
---|
4416 | } |
---|
4417 | |
---|
4418 | // coherence clack request (from DSPIN CLACK) |
---|
4419 | if (r_dcache_clack_req.read()) |
---|
4420 | { |
---|
4421 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4422 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4423 | break; |
---|
4424 | } |
---|
4425 | |
---|
4426 | // coherence request (from CC_RECEIVE FSM) |
---|
4427 | if (r_cc_receive_dcache_req.read() and |
---|
4428 | not r_dcache_cc_send_req.read() and |
---|
4429 | not r_dcache_cleanup_victim_req.read()) |
---|
4430 | { |
---|
4431 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4432 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4433 | break; |
---|
4434 | } |
---|
4435 | |
---|
4436 | if (not r_dcache_miss_clack.read()) // waiting cleanup acknowledge |
---|
4437 | { |
---|
4438 | if (r_dcache_miss_inval.read()) // switch slot to ZOMBI state, and new cleanup |
---|
4439 | { |
---|
4440 | if (not r_dcache_cc_send_req.read()) // blocked until previous request sent |
---|
4441 | { |
---|
4442 | r_dcache_miss_inval = false; |
---|
4443 | // request cleanup |
---|
4444 | r_dcache_cc_send_req = true; |
---|
4445 | r_dcache_cc_send_nline = r_dcache_save_paddr.read() / (m_dcache_words << 2); |
---|
4446 | r_dcache_cc_send_way = r_dcache_miss_way.read(); |
---|
4447 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4448 | |
---|
4449 | #ifdef INSTRUMENTATION |
---|
4450 | m_cpt_dcache_dir_write++; |
---|
4451 | #endif |
---|
4452 | r_dcache.write_dir( r_dcache_save_paddr.read(), |
---|
4453 | r_dcache_miss_way.read(), |
---|
4454 | r_dcache_miss_set.read(), |
---|
4455 | CACHE_SLOT_STATE_ZOMBI ); |
---|
4456 | #if DEBUG_DCACHE |
---|
4457 | if (m_debug_dcache_fsm) |
---|
4458 | std::cout << " <PROC " << name() |
---|
4459 | << " DCACHE_MISS_DIR_UPDT> Switch slot to ZOMBI state" |
---|
4460 | << " PADDR = " << std::hex << r_dcache_save_paddr.read() |
---|
4461 | << " / WAY = " << std::dec << r_dcache_miss_way.read() |
---|
4462 | << " / SET = " << r_dcache_miss_set.read() << std::endl; |
---|
4463 | #endif |
---|
4464 | } |
---|
4465 | else |
---|
4466 | break; |
---|
4467 | } |
---|
4468 | else // switch slot to VALID state |
---|
4469 | { |
---|
4470 | |
---|
4471 | #ifdef INSTRUMENTATION |
---|
4472 | m_cpt_dcache_dir_write++; |
---|
4473 | #endif |
---|
4474 | r_dcache.write_dir(r_dcache_save_paddr.read(), |
---|
4475 | r_dcache_miss_way.read(), |
---|
4476 | r_dcache_miss_set.read(), |
---|
4477 | CACHE_SLOT_STATE_VALID); |
---|
4478 | |
---|
4479 | #if DEBUG_DCACHE |
---|
4480 | if (m_debug_dcache_fsm) |
---|
4481 | std::cout << " <PROC " << name() |
---|
4482 | << " DCACHE_MISS_DIR_UPDT> Switch slot to VALID state" |
---|
4483 | << " PADDR = " << std::hex << r_dcache_save_paddr.read() |
---|
4484 | << " / WAY = " << std::dec << r_dcache_miss_way.read() |
---|
4485 | << " / SET = " << r_dcache_miss_set.read() << std::endl; |
---|
4486 | #endif |
---|
4487 | // reset directory extension |
---|
4488 | size_t way = r_dcache_miss_way.read(); |
---|
4489 | size_t set = r_dcache_miss_set.read(); |
---|
4490 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
4491 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
4492 | } |
---|
4493 | if (r_dcache_miss_type.read() == PTE1_MISS) r_dcache_fsm = DCACHE_TLB_PTE1_GET; |
---|
4494 | else if (r_dcache_miss_type.read() == PTE2_MISS) r_dcache_fsm = DCACHE_TLB_PTE2_GET; |
---|
4495 | else r_dcache_fsm = DCACHE_IDLE; |
---|
4496 | } |
---|
4497 | break; |
---|
4498 | } |
---|
4499 | ///////////////////// |
---|
4500 | case DCACHE_UNC_WAIT: // waiting a response to an uncacheable read/write |
---|
4501 | { |
---|
4502 | // coherence clack request (from DSPIN CLACK) |
---|
4503 | if (r_dcache_clack_req.read()) |
---|
4504 | { |
---|
4505 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4506 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4507 | break; |
---|
4508 | } |
---|
4509 | |
---|
4510 | // coherence request (from CC_RECEIVE FSM) |
---|
4511 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
4512 | { |
---|
4513 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4514 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4515 | break; |
---|
4516 | } |
---|
4517 | |
---|
4518 | if (r_vci_rsp_data_error.read()) // bus error |
---|
4519 | { |
---|
4520 | if (r_dcache_vci_unc_write.read()) |
---|
4521 | r_mmu_detr = MMU_WRITE_DATA_ILLEGAL_ACCESS; |
---|
4522 | else |
---|
4523 | r_mmu_detr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
4524 | |
---|
4525 | r_mmu_dbvar = m_dreq.addr; |
---|
4526 | r_vci_rsp_data_error = false; |
---|
4527 | m_drsp.error = true; |
---|
4528 | m_drsp.valid = true; |
---|
4529 | r_dcache_fsm = DCACHE_IDLE; |
---|
4530 | break; |
---|
4531 | } |
---|
4532 | else if (r_vci_rsp_fifo_dcache.rok()) // data available |
---|
4533 | { |
---|
4534 | // consume data |
---|
4535 | vci_rsp_fifo_dcache_get = true; |
---|
4536 | r_dcache_fsm = DCACHE_IDLE; |
---|
4537 | |
---|
4538 | // acknowledge the processor request if it has not been modified |
---|
4539 | if (m_dreq.valid and (m_dreq.addr == r_dcache_save_vaddr.read())) |
---|
4540 | { |
---|
4541 | m_drsp.valid = true; |
---|
4542 | m_drsp.error = false; |
---|
4543 | m_drsp.rdata = r_vci_rsp_fifo_dcache.read(); |
---|
4544 | } |
---|
4545 | } |
---|
4546 | break; |
---|
4547 | } |
---|
4548 | ///////////////////// |
---|
4549 | case DCACHE_LL_WAIT: // waiting VCI response to a LL transaction |
---|
4550 | { |
---|
4551 | // coherence clack request (from DSPIN CLACK) |
---|
4552 | if (r_dcache_clack_req.read()) |
---|
4553 | { |
---|
4554 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4555 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4556 | break; |
---|
4557 | } |
---|
4558 | |
---|
4559 | // coherence request (from CC_RECEIVE FSM) |
---|
4560 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
4561 | { |
---|
4562 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4563 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4564 | break; |
---|
4565 | } |
---|
4566 | |
---|
4567 | if (r_vci_rsp_data_error.read()) // bus error |
---|
4568 | { |
---|
4569 | r_mmu_detr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
4570 | r_mmu_dbvar = m_dreq.addr; |
---|
4571 | r_vci_rsp_data_error = false; |
---|
4572 | m_drsp.error = true; |
---|
4573 | m_drsp.valid = true; |
---|
4574 | r_dcache_fsm = DCACHE_IDLE; |
---|
4575 | break; |
---|
4576 | } |
---|
4577 | else if (r_vci_rsp_fifo_dcache.rok()) // data available |
---|
4578 | { |
---|
4579 | // consume data |
---|
4580 | vci_rsp_fifo_dcache_get = true; |
---|
4581 | |
---|
4582 | if (r_dcache_ll_rsp_count.read() == 0) // first flit |
---|
4583 | { |
---|
4584 | // set key value in llsc reservation buffer |
---|
4585 | r_dcache_llsc_key = r_vci_rsp_fifo_dcache.read(); |
---|
4586 | r_dcache_ll_rsp_count = r_dcache_ll_rsp_count.read() + 1; |
---|
4587 | } |
---|
4588 | else // last flit |
---|
4589 | { |
---|
4590 | // acknowledge the processor request if it has not been modified |
---|
4591 | if (m_dreq.valid and (m_dreq.addr == r_dcache_save_vaddr.read())) |
---|
4592 | { |
---|
4593 | m_drsp.valid = true; |
---|
4594 | m_drsp.error = false; |
---|
4595 | m_drsp.rdata = r_vci_rsp_fifo_dcache.read(); |
---|
4596 | } |
---|
4597 | r_dcache_fsm = DCACHE_IDLE; |
---|
4598 | } |
---|
4599 | } |
---|
4600 | break; |
---|
4601 | } |
---|
4602 | //////////////////// |
---|
4603 | case DCACHE_SC_WAIT: // waiting VCI response to a SC transaction |
---|
4604 | { |
---|
4605 | // coherence clack request (from DSPIN CLACK) |
---|
4606 | if (r_dcache_clack_req.read()) |
---|
4607 | { |
---|
4608 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4609 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4610 | break; |
---|
4611 | } |
---|
4612 | |
---|
4613 | // coherence request (from CC_RECEIVE FSM) |
---|
4614 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
4615 | { |
---|
4616 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4617 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4618 | break; |
---|
4619 | } |
---|
4620 | |
---|
4621 | if (r_vci_rsp_data_error.read()) // bus error |
---|
4622 | { |
---|
4623 | r_mmu_detr = MMU_READ_DATA_ILLEGAL_ACCESS; |
---|
4624 | r_mmu_dbvar = m_dreq.addr; |
---|
4625 | r_vci_rsp_data_error = false; |
---|
4626 | m_drsp.error = true; |
---|
4627 | m_drsp.valid = true; |
---|
4628 | r_dcache_fsm = DCACHE_IDLE; |
---|
4629 | break; |
---|
4630 | } |
---|
4631 | else if (r_vci_rsp_fifo_dcache.rok()) // response available |
---|
4632 | { |
---|
4633 | // consume response |
---|
4634 | vci_rsp_fifo_dcache_get = true; |
---|
4635 | m_drsp.valid = true; |
---|
4636 | m_drsp.rdata = r_vci_rsp_fifo_dcache.read(); |
---|
4637 | r_dcache_fsm = DCACHE_IDLE; |
---|
4638 | } |
---|
4639 | break; |
---|
4640 | } |
---|
4641 | ////////////////////////// |
---|
4642 | case DCACHE_DIRTY_GET_PTE: // This sub_fsm set the PTE Dirty bit in memory |
---|
4643 | // before handling a processor WRITE or SC request |
---|
4644 | // Input argument is r_dcache_dirty_paddr |
---|
4645 | // In this first state, we get PTE value in dcache |
---|
4646 | // and post a CAS request to CMD FSM |
---|
4647 | { |
---|
4648 | // get PTE in dcache |
---|
4649 | uint32_t pte; |
---|
4650 | size_t way; |
---|
4651 | size_t set; |
---|
4652 | size_t word; // unused |
---|
4653 | int state; |
---|
4654 | |
---|
4655 | #ifdef INSTRUMENTATION |
---|
4656 | m_cpt_dcache_data_read++; |
---|
4657 | m_cpt_dcache_dir_read++; |
---|
4658 | #endif |
---|
4659 | r_dcache.read(r_dcache_dirty_paddr.read(), |
---|
4660 | &pte, |
---|
4661 | &way, |
---|
4662 | &set, |
---|
4663 | &word, |
---|
4664 | &state); |
---|
4665 | |
---|
4666 | assert( (state == CACHE_SLOT_STATE_VALID) and |
---|
4667 | "error in DCACHE_DIRTY_TLB_SET: the PTE should be in dcache" ); |
---|
4668 | |
---|
4669 | // request CAS transaction to CMD_FSM |
---|
4670 | r_dcache_dirty_way = way; |
---|
4671 | r_dcache_dirty_set = set; |
---|
4672 | |
---|
4673 | // check llsc reservation buffer |
---|
4674 | if (r_dcache_llsc_paddr.read() == r_dcache_dirty_paddr.read()) |
---|
4675 | r_dcache_llsc_valid = false; |
---|
4676 | |
---|
4677 | // request a CAS CMD and go to DCACHE_DIRTY_WAIT state |
---|
4678 | r_dcache_vci_cas_req = true; |
---|
4679 | r_dcache_vci_paddr = r_dcache_dirty_paddr.read(); |
---|
4680 | r_dcache_vci_cas_old = pte; |
---|
4681 | r_dcache_vci_cas_new = pte | PTE_D_MASK; |
---|
4682 | r_dcache_fsm = DCACHE_DIRTY_WAIT; |
---|
4683 | |
---|
4684 | #if DEBUG_DCACHE |
---|
4685 | if (m_debug_dcache_fsm) |
---|
4686 | { |
---|
4687 | std::cout << " <PROC " << name() |
---|
4688 | << " DCACHE_DIRTY_GET_PTE> CAS request" << std::hex |
---|
4689 | << " / PTE_PADDR = " << r_dcache_dirty_paddr.read() |
---|
4690 | << " / PTE_VALUE = " << pte << std::dec |
---|
4691 | << " / SET = " << set |
---|
4692 | << " / WAY = " << way << std::endl; |
---|
4693 | } |
---|
4694 | #endif |
---|
4695 | break; |
---|
4696 | } |
---|
4697 | /////////////////////// |
---|
4698 | case DCACHE_DIRTY_WAIT: // wait completion of CAS for PTE Dirty bit, |
---|
4699 | // and return to IDLE state when response is received. |
---|
4700 | // we don't care if the CAS is a failure: |
---|
4701 | // - if the CAS is a success, the coherence mechanism |
---|
4702 | // updates the local copy. |
---|
4703 | // - if the CAS is a failure, we just retry the write. |
---|
4704 | { |
---|
4705 | // coherence clack request (from DSPIN CLACK) |
---|
4706 | if (r_dcache_clack_req.read()) |
---|
4707 | { |
---|
4708 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4709 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4710 | break; |
---|
4711 | } |
---|
4712 | |
---|
4713 | // coherence request (from CC_RECEIVE FSM) |
---|
4714 | if (r_cc_receive_dcache_req.read() and not r_dcache_cc_send_req.read()) |
---|
4715 | { |
---|
4716 | r_dcache_fsm = DCACHE_CC_CHECK; |
---|
4717 | r_dcache_fsm_cc_save = r_dcache_fsm.read(); |
---|
4718 | break; |
---|
4719 | } |
---|
4720 | |
---|
4721 | if (r_vci_rsp_data_error.read()) // bus error |
---|
4722 | { |
---|
4723 | std::cout << "BUS ERROR in DCACHE_DIRTY_WAIT state" << std::endl; |
---|
4724 | std::cout << "This should not happen in this state" << std::endl; |
---|
4725 | exit(0); |
---|
4726 | } |
---|
4727 | else if (r_vci_rsp_fifo_dcache.rok()) // response available |
---|
4728 | { |
---|
4729 | vci_rsp_fifo_dcache_get = true; |
---|
4730 | r_dcache_fsm = DCACHE_IDLE; |
---|
4731 | |
---|
4732 | #if DEBUG_DCACHE |
---|
4733 | if (m_debug_dcache_fsm) |
---|
4734 | { |
---|
4735 | std::cout << " <PROC " << name() |
---|
4736 | << " DCACHE_DIRTY_WAIT> CAS completed" << std::endl; |
---|
4737 | } |
---|
4738 | #endif |
---|
4739 | } |
---|
4740 | break; |
---|
4741 | } |
---|
4742 | ///////////////////// |
---|
4743 | case DCACHE_CC_CHECK: // This state is the entry point for the sub-FSM |
---|
4744 | // handling coherence requests for DCACHE. |
---|
4745 | // If there is a matching pending miss on the modified cache |
---|
4746 | // line this is signaled in the r_dcache_miss inval flip-flop. |
---|
4747 | // If the updated (or invalidated) cache line has copies in TLBs |
---|
4748 | // these TLB copies are invalidated. |
---|
4749 | // The return state is defined in r_dcache_fsm_cc_save |
---|
4750 | { |
---|
4751 | paddr_t paddr = r_cc_receive_dcache_nline.read() * m_dcache_words * 4; |
---|
4752 | paddr_t mask = ~((m_dcache_words << 2) - 1); |
---|
4753 | |
---|
4754 | // CLACK handler |
---|
4755 | // We switch the directory slot to EMPTY state and reset |
---|
4756 | // r_dcache_miss_clack if the cleanup ack is matching a pending miss. |
---|
4757 | if (r_dcache_clack_req.read()) |
---|
4758 | { |
---|
4759 | if (m_dreq.valid ) m_cost_data_miss_frz++; |
---|
4760 | |
---|
4761 | #ifdef INSTRUMENTATION |
---|
4762 | m_cpt_dcache_dir_write++; |
---|
4763 | #endif |
---|
4764 | r_dcache.write_dir(0, |
---|
4765 | r_dcache_clack_way.read(), |
---|
4766 | r_dcache_clack_set.read(), |
---|
4767 | CACHE_SLOT_STATE_EMPTY); |
---|
4768 | |
---|
4769 | if ((r_dcache_miss_set.read() == r_dcache_clack_set.read()) and |
---|
4770 | (r_dcache_miss_way.read() == r_dcache_clack_way.read())) |
---|
4771 | { |
---|
4772 | r_dcache_miss_clack = false; |
---|
4773 | } |
---|
4774 | |
---|
4775 | r_dcache_clack_req = false; |
---|
4776 | |
---|
4777 | // return to cc_save state |
---|
4778 | r_dcache_fsm = r_dcache_fsm_cc_save.read() ; |
---|
4779 | |
---|
4780 | #if DEBUG_DCACHE |
---|
4781 | if (m_debug_dcache_fsm) |
---|
4782 | { |
---|
4783 | std::cout << " <PROC " << name() |
---|
4784 | << " DCACHE_CC_CHECK> CLACK for PADDR " << paddr |
---|
4785 | << " Switch slot to EMPTY state : " |
---|
4786 | << " set = " << r_dcache_clack_set.read() |
---|
4787 | << " / way = " << r_dcache_clack_way.read() << std::endl; |
---|
4788 | } |
---|
4789 | #endif |
---|
4790 | break; |
---|
4791 | } |
---|
4792 | |
---|
4793 | assert(not r_dcache_cc_send_req.read() and |
---|
4794 | "CC_SEND must be available in DCACHE_CC_CHECK"); |
---|
4795 | |
---|
4796 | // Match between MISS address and CC address |
---|
4797 | if (r_cc_receive_dcache_req.read() and |
---|
4798 | ((r_dcache_fsm_cc_save == DCACHE_MISS_SELECT) or |
---|
4799 | (r_dcache_fsm_cc_save == DCACHE_MISS_WAIT) or |
---|
4800 | (r_dcache_fsm_cc_save == DCACHE_MISS_DIR_UPDT)) and |
---|
4801 | ((r_dcache_vci_paddr.read() & mask) == (paddr & mask))) // matching |
---|
4802 | { |
---|
4803 | // signaling matching |
---|
4804 | r_dcache_miss_inval = true; |
---|
4805 | |
---|
4806 | // in case of update, go to CC_UPDT |
---|
4807 | // JUST TO POP THE FIFO |
---|
4808 | if (r_cc_receive_dcache_type.read() == CC_TYPE_UPDT) |
---|
4809 | { |
---|
4810 | r_dcache_fsm = DCACHE_CC_UPDT; |
---|
4811 | r_dcache_cc_word = r_cc_receive_word_idx.read(); |
---|
4812 | |
---|
4813 | // just pop the fifo , don't write in icache |
---|
4814 | r_dcache_cc_need_write = false; |
---|
4815 | } |
---|
4816 | // the request is dealt with |
---|
4817 | else |
---|
4818 | { |
---|
4819 | r_cc_receive_dcache_req = false; |
---|
4820 | r_dcache_fsm = r_dcache_fsm_cc_save.read(); |
---|
4821 | } |
---|
4822 | |
---|
4823 | #if DEBUG_DCACHE |
---|
4824 | if (m_debug_dcache_fsm) |
---|
4825 | { |
---|
4826 | std::cout << " <PROC " << name() |
---|
4827 | << " DCACHE_CC_CHECK> Coherence request matching a pending miss:" |
---|
4828 | << " PADDR = " << std::hex << paddr << std::endl; |
---|
4829 | } |
---|
4830 | #endif |
---|
4831 | } |
---|
4832 | |
---|
4833 | // CC request handler |
---|
4834 | |
---|
4835 | int state = 0; |
---|
4836 | size_t way = 0; |
---|
4837 | size_t set = 0; |
---|
4838 | size_t word = 0; |
---|
4839 | |
---|
4840 | #ifdef INSTRUMENTATION |
---|
4841 | m_cpt_dcache_dir_read++; |
---|
4842 | #endif |
---|
4843 | r_dcache.read_dir(paddr, |
---|
4844 | &state, |
---|
4845 | &way, |
---|
4846 | &set, |
---|
4847 | &word); // unused |
---|
4848 | |
---|
4849 | r_dcache_cc_way = way; |
---|
4850 | r_dcache_cc_set = set; |
---|
4851 | |
---|
4852 | if (state == CACHE_SLOT_STATE_VALID) // hit |
---|
4853 | { |
---|
4854 | // need to update the cache state |
---|
4855 | if (r_cc_receive_dcache_type.read() == CC_TYPE_UPDT) // hit update |
---|
4856 | { |
---|
4857 | r_dcache_cc_need_write = true; |
---|
4858 | r_dcache_fsm = DCACHE_CC_UPDT; |
---|
4859 | r_dcache_cc_word = r_cc_receive_word_idx.read(); |
---|
4860 | } |
---|
4861 | else if (r_cc_receive_dcache_type.read() == CC_TYPE_INVAL) // hit inval |
---|
4862 | { |
---|
4863 | r_dcache_fsm = DCACHE_CC_INVAL; |
---|
4864 | } |
---|
4865 | } |
---|
4866 | else // miss |
---|
4867 | { |
---|
4868 | // multicast acknowledgement required in case of update |
---|
4869 | if (r_cc_receive_dcache_type.read() == CC_TYPE_UPDT) |
---|
4870 | { |
---|
4871 | r_dcache_fsm = DCACHE_CC_UPDT; |
---|
4872 | r_dcache_cc_word = r_cc_receive_word_idx.read(); |
---|
4873 | |
---|
4874 | // just pop the fifo , don't write in icache |
---|
4875 | r_dcache_cc_need_write = false; |
---|
4876 | } |
---|
4877 | else // No response needed |
---|
4878 | { |
---|
4879 | r_cc_receive_dcache_req = false; |
---|
4880 | r_dcache_fsm = r_dcache_fsm_cc_save.read(); |
---|
4881 | } |
---|
4882 | } |
---|
4883 | |
---|
4884 | #if DEBUG_DCACHE |
---|
4885 | if (m_debug_dcache_fsm) |
---|
4886 | { |
---|
4887 | std::cout << " <PROC " << name() |
---|
4888 | << " DCACHE_CC_CHECK> Coherence request received:" |
---|
4889 | << " PADDR = " << std::hex << paddr |
---|
4890 | << " / TYPE = " << std::dec << r_cc_receive_dcache_type.read() |
---|
4891 | << " / HIT = " << (state == CACHE_SLOT_STATE_VALID) << std::endl; |
---|
4892 | } |
---|
4893 | #endif |
---|
4894 | |
---|
4895 | break; |
---|
4896 | } |
---|
4897 | ///////////////////// |
---|
4898 | case DCACHE_CC_INVAL: // hit inval: switch slot to ZOMBI state and send a |
---|
4899 | // CLEANUP after possible invalidation of copies in |
---|
4900 | // TLBs |
---|
4901 | { |
---|
4902 | size_t way = r_dcache_cc_way.read(); |
---|
4903 | size_t set = r_dcache_cc_set.read(); |
---|
4904 | |
---|
4905 | if (r_dcache_in_tlb[way * m_dcache_sets + set]) // selective TLB inval |
---|
4906 | { |
---|
4907 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
4908 | r_dcache_tlb_inval_line = r_cc_receive_dcache_nline.read(); |
---|
4909 | r_dcache_tlb_inval_set = 0; |
---|
4910 | r_dcache_fsm_scan_save = r_dcache_fsm.read(); |
---|
4911 | r_dcache_fsm = DCACHE_INVAL_TLB_SCAN; |
---|
4912 | break; |
---|
4913 | } |
---|
4914 | |
---|
4915 | if (r_dcache_contains_ptd[way * m_dcache_sets + set]) // TLB flush |
---|
4916 | { |
---|
4917 | r_itlb.reset(); |
---|
4918 | r_dtlb.reset(); |
---|
4919 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
4920 | |
---|
4921 | #if DEBUG_DCACHE |
---|
4922 | if (m_debug_dcache_fsm) |
---|
4923 | { |
---|
4924 | std::cout << " <PROC " << name() |
---|
4925 | << " DCACHE_CC_INVAL> Flush DTLB & ITLB" << std::endl; |
---|
4926 | } |
---|
4927 | #endif |
---|
4928 | } |
---|
4929 | |
---|
4930 | assert(not r_dcache_cc_send_req.read() && |
---|
4931 | "ERROR in DCACHE_CC_INVAL: the r_dcache_cc_send_req " |
---|
4932 | "must not be set"); |
---|
4933 | |
---|
4934 | // Switch slot state to ZOMBI and send CLEANUP command |
---|
4935 | r_dcache.write_dir(way, |
---|
4936 | set, |
---|
4937 | CACHE_SLOT_STATE_ZOMBI); |
---|
4938 | |
---|
4939 | // coherence request completed |
---|
4940 | r_cc_receive_dcache_req = false; |
---|
4941 | r_dcache_cc_send_req = true; |
---|
4942 | r_dcache_cc_send_nline = r_cc_receive_dcache_nline.read(); |
---|
4943 | r_dcache_cc_send_way = r_dcache_cc_way.read(); |
---|
4944 | r_dcache_cc_send_type = CC_TYPE_CLEANUP; |
---|
4945 | r_dcache_fsm = r_dcache_fsm_cc_save.read(); |
---|
4946 | |
---|
4947 | #if DEBUG_DCACHE |
---|
4948 | if (m_debug_dcache_fsm) |
---|
4949 | { |
---|
4950 | std::cout << " <PROC " << name() |
---|
4951 | << " DCACHE_CC_INVAL> Switch slot to EMPTY state:" << std::dec |
---|
4952 | << " / WAY = " << way |
---|
4953 | << " / SET = " << set << std::endl; |
---|
4954 | } |
---|
4955 | #endif |
---|
4956 | break; |
---|
4957 | } |
---|
4958 | /////////////////// |
---|
4959 | case DCACHE_CC_UPDT: // hit update: write one word per cycle, |
---|
4960 | // after possible invalidation of copies in TLBs |
---|
4961 | { |
---|
4962 | size_t word = r_dcache_cc_word.read(); |
---|
4963 | size_t way = r_dcache_cc_way.read(); |
---|
4964 | size_t set = r_dcache_cc_set.read(); |
---|
4965 | |
---|
4966 | if (r_dcache_in_tlb[way * m_dcache_sets + set]) // selective TLB inval |
---|
4967 | { |
---|
4968 | r_dcache_in_tlb[way * m_dcache_sets + set] = false; |
---|
4969 | r_dcache_tlb_inval_line = r_cc_receive_dcache_nline.read(); |
---|
4970 | r_dcache_tlb_inval_set = 0; |
---|
4971 | r_dcache_fsm_scan_save = r_dcache_fsm.read(); |
---|
4972 | r_dcache_fsm = DCACHE_INVAL_TLB_SCAN; |
---|
4973 | |
---|
4974 | break; |
---|
4975 | } |
---|
4976 | |
---|
4977 | if (r_dcache_contains_ptd[way * m_dcache_sets + set]) // TLB flush |
---|
4978 | { |
---|
4979 | r_itlb.reset(); |
---|
4980 | r_dtlb.reset(); |
---|
4981 | r_dcache_contains_ptd[way * m_dcache_sets + set] = false; |
---|
4982 | |
---|
4983 | #if DEBUG_DCACHE |
---|
4984 | if (m_debug_dcache_fsm) |
---|
4985 | { |
---|
4986 | std::cout << " <PROC " << name() |
---|
4987 | << " DCACHE_CC_UPDT> Flush DTLB & ITLB" << std::endl; |
---|
4988 | } |
---|
4989 | #endif |
---|
4990 | } |
---|
4991 | |
---|
4992 | assert (not r_dcache_cc_send_req.read() && |
---|
4993 | "ERROR in DCACHE_CC_INVAL: the r_dcache_cc_send_req " |
---|
4994 | "must not be set"); |
---|
4995 | |
---|
4996 | if (not r_cc_receive_updt_fifo_be.rok()) break; |
---|
4997 | |
---|
4998 | if (r_dcache_cc_need_write.read()) |
---|
4999 | { |
---|
5000 | |
---|
5001 | #ifdef INSTRUMENTATION |
---|
5002 | m_cpt_dcache_data_write++; |
---|
5003 | #endif |
---|
5004 | r_dcache.write(way, |
---|
5005 | set, |
---|
5006 | word, |
---|
5007 | r_cc_receive_updt_fifo_data.read(), |
---|
5008 | r_cc_receive_updt_fifo_be.read()); |
---|
5009 | |
---|
5010 | r_dcache_cc_word = word + 1; |
---|
5011 | |
---|
5012 | #if DEBUG_DCACHE |
---|
5013 | if (m_debug_dcache_fsm) |
---|
5014 | { |
---|
5015 | std::cout << " <PROC " << name() |
---|
5016 | << " DCACHE_CC_UPDT> Write one word" << std::dec |
---|
5017 | << " / WAY = " << way |
---|
5018 | << " / SET = " << set |
---|
5019 | << " / WORD = " << word |
---|
5020 | << " / VALUE = " << std::hex << r_cc_receive_updt_fifo_data.read() << std::endl; |
---|
5021 | } |
---|
5022 | #endif |
---|
5023 | } |
---|
5024 | |
---|
5025 | if (r_cc_receive_updt_fifo_eop.read()) // last word |
---|
5026 | { |
---|
5027 | // no need to write in the cache anymore |
---|
5028 | r_dcache_cc_need_write = false; |
---|
5029 | |
---|
5030 | // coherence request completed |
---|
5031 | r_cc_receive_dcache_req = false; |
---|
5032 | |
---|
5033 | // request multicast acknowledgement |
---|
5034 | r_dcache_cc_send_req = true; |
---|
5035 | r_dcache_cc_send_nline = r_cc_receive_dcache_nline.read(); |
---|
5036 | r_dcache_cc_send_updt_tab_idx = r_cc_receive_dcache_updt_tab_idx.read(); |
---|
5037 | r_dcache_cc_send_type = CC_TYPE_MULTI_ACK; |
---|
5038 | r_dcache_fsm = r_dcache_fsm_cc_save.read(); |
---|
5039 | } |
---|
5040 | |
---|
5041 | //consume fifo if not eop |
---|
5042 | cc_receive_updt_fifo_get = true; |
---|
5043 | |
---|
5044 | break; |
---|
5045 | } |
---|
5046 | /////////////////////////// |
---|
5047 | case DCACHE_INVAL_TLB_SCAN: // Scan sequencially all sets for both ITLB & DTLB |
---|
5048 | // It makes assumption: m_itlb_sets == m_dtlb_sets |
---|
5049 | // All ways are handled in parallel. |
---|
5050 | // We enter this state when a DCACHE line is modified, |
---|
5051 | // and there is a copy in itlb or dtlb. |
---|
5052 | // It can be caused by: |
---|
5053 | // - a coherence inval or updt transaction, |
---|
5054 | // - a line inval caused by a cache miss |
---|
5055 | // - a processor XTN inval request, |
---|
5056 | // - a WRITE hit, |
---|
5057 | // - a Dirty bit update |
---|
5058 | // Input arguments are: |
---|
5059 | // - r_dcache_tlb_inval_line |
---|
5060 | // - r_dcache_tlb_inval_set |
---|
5061 | // - r_dcache_fsm_scan_save |
---|
5062 | { |
---|
5063 | paddr_t line = r_dcache_tlb_inval_line.read(); |
---|
5064 | size_t set = r_dcache_tlb_inval_set.read(); |
---|
5065 | size_t way; |
---|
5066 | bool ok; |
---|
5067 | |
---|
5068 | for (way = 0; way < m_itlb_ways; way++) |
---|
5069 | { |
---|
5070 | ok = r_itlb.inval(line, way, set); |
---|
5071 | |
---|
5072 | #if DEBUG_DCACHE |
---|
5073 | if (m_debug_dcache_fsm and ok) |
---|
5074 | { |
---|
5075 | std::cout << " <PROC " << name() |
---|
5076 | << ".DCACHE_INVAL_TLB_SCAN> Invalidate ITLB entry:" << std::hex |
---|
5077 | << " line = " << line << std::dec |
---|
5078 | << " / set = " << set |
---|
5079 | << " / way = " << way << std::endl; |
---|
5080 | } |
---|
5081 | #endif |
---|
5082 | } |
---|
5083 | |
---|
5084 | for (way = 0; way < m_dtlb_ways; way++) |
---|
5085 | { |
---|
5086 | ok = r_dtlb.inval( line, way, set); |
---|
5087 | |
---|
5088 | #if DEBUG_DCACHE |
---|
5089 | if (m_debug_dcache_fsm and ok) |
---|
5090 | std::cout << " <PROC " << name() << " DCACHE_INVAL_TLB_SCAN>" |
---|
5091 | << " Invalidate DTLB entry" << std::hex |
---|
5092 | << " / line = " << line << std::dec |
---|
5093 | << " / set = " << set |
---|
5094 | << " / way = " << way << std::endl; |
---|
5095 | #endif |
---|
5096 | } |
---|
5097 | |
---|
5098 | // return to the calling state when TLB inval completed |
---|
5099 | if (r_dcache_tlb_inval_set.read() == (m_dtlb_sets - 1)) |
---|
5100 | { |
---|
5101 | r_dcache_fsm = r_dcache_fsm_scan_save.read(); |
---|
5102 | } |
---|
5103 | r_dcache_tlb_inval_set = r_dcache_tlb_inval_set.read() + 1; |
---|
5104 | break; |
---|
5105 | } |
---|
5106 | } // end switch r_dcache_fsm |
---|
5107 | |
---|
5108 | ///////////////// wbuf update /////////////////////////////////////////////////////// |
---|
5109 | r_wbuf.update(); |
---|
5110 | |
---|
5111 | ///////////////// llsc update /////////////////////////////////////////////////////// |
---|
5112 | if (r_dcache_llsc_valid.read()) r_dcache_llsc_count = r_dcache_llsc_count.read() - 1; |
---|
5113 | if (r_dcache_llsc_count.read() == 1) r_dcache_llsc_valid = false; |
---|
5114 | |
---|
5115 | //////////////// test processor frozen ////////////////////////////////////////////// |
---|
5116 | // The simulation exit if the number of consecutive frozen cycles |
---|
5117 | // is larger than the m_max_frozen_cycles (constructor parameter) |
---|
5118 | if ((m_ireq.valid and not m_irsp.valid) or (m_dreq.valid and not m_drsp.valid)) |
---|
5119 | { |
---|
5120 | m_cpt_frz_cycles++; // used for instrumentation |
---|
5121 | m_cpt_stop_simulation++; // used for debug |
---|
5122 | if (m_cpt_stop_simulation > m_max_frozen_cycles) |
---|
5123 | { |
---|
5124 | std::cout << std::dec << "ERROR in CC_VCACHE_WRAPPER " << name() << std::endl |
---|
5125 | << " stop at cycle " << m_cpt_total_cycles << std::endl |
---|
5126 | << " frozen since cycle " << m_cpt_total_cycles - m_max_frozen_cycles |
---|
5127 | << std::endl; |
---|
5128 | r_iss.dump(); |
---|
5129 | exit(1); |
---|
5130 | } |
---|
5131 | } |
---|
5132 | else |
---|
5133 | { |
---|
5134 | m_cpt_stop_simulation = 0; |
---|
5135 | } |
---|
5136 | |
---|
5137 | /////////// execute one iss cycle ///////////////////////////////// |
---|
5138 | { |
---|
5139 | uint32_t it = 0; |
---|
5140 | for (size_t i = 0; i < (size_t) iss_t::n_irq; i++) if (p_irq[i].read()) it |= (1 << i); |
---|
5141 | r_iss.executeNCycles(1, m_irsp, m_drsp, it); |
---|
5142 | } |
---|
5143 | |
---|
5144 | //////////////////////////////////////////////////////////////////////////// |
---|
5145 | // The VCI_CMD FSM controls the following ressources: |
---|
5146 | // - r_vci_cmd_fsm |
---|
5147 | // - r_vci_cmd_min |
---|
5148 | // - r_vci_cmd_max |
---|
5149 | // - r_vci_cmd_cpt |
---|
5150 | // - r_vci_cmd_imiss_prio |
---|
5151 | // - wbuf (reset) |
---|
5152 | // - r_icache_miss_req (reset) |
---|
5153 | // - r_icache_unc_req (reset) |
---|
5154 | // - r_dcache_vci_miss_req (reset) |
---|
5155 | // - r_dcache_vci_unc_req (reset) |
---|
5156 | // - r_dcache_vci_ll_req (reset) |
---|
5157 | // - r_dcache_vci_sc_req (reset in case of local sc fail) |
---|
5158 | // - r_dcache_vci_cas_req (reset) |
---|
5159 | // |
---|
5160 | // This FSM handles requests from both the DCACHE FSM & the ICACHE FSM. |
---|
5161 | // There are 8 request types, with the following priorities : |
---|
5162 | // 1 - Data Read Miss : r_dcache_vci_miss_req and miss in the write buffer |
---|
5163 | // 2 - Data Read Uncachable : r_dcache_vci_unc_req |
---|
5164 | // 3 - Instruction Miss : r_icache_miss_req and miss in the write buffer |
---|
5165 | // 4 - Instruction Uncachable : r_icache_unc_req |
---|
5166 | // 5 - Data Write : r_wbuf.rok() |
---|
5167 | // 6 - Data Linked Load : r_dcache_vci_ll_req |
---|
5168 | // 7 - Data Store Conditionnal: r_dcache_vci_sc_req |
---|
5169 | // 8 - Compare And Swap : r_dcache_vci_cas_req |
---|
5170 | // |
---|
5171 | // As we want to support several simultaneous VCI transactions, the VCI_CMD_FSM |
---|
5172 | // and the VCI_RSP_FSM are fully desynchronized. |
---|
5173 | // |
---|
5174 | // VCI formats: |
---|
5175 | // According to the VCI advanced specification, all read requests packets |
---|
5176 | // (data Uncached, Miss data, instruction Uncached, Miss instruction) |
---|
5177 | // are one word packets. |
---|
5178 | // For write burst packets, all words are in the same cache line, |
---|
5179 | // and addresses must be contiguous (the BE field is 0 in case of "holes"). |
---|
5180 | // The sc command packet implements actually a compare-and-swap mechanism |
---|
5181 | // and the packet contains two flits. |
---|
5182 | //////////////////////////////////////////////////////////////////////////////////// |
---|
5183 | |
---|
5184 | |
---|
5185 | switch (r_vci_cmd_fsm.read()) |
---|
5186 | { |
---|
5187 | ////////////// |
---|
5188 | case CMD_IDLE: |
---|
5189 | { |
---|
5190 | // DCACHE read requests (r_dcache_vci_miss_req or r_dcache_vci_ll_req), and |
---|
5191 | // ICACHE read requests (r_icache_miss_req) require both a write_buffer access |
---|
5192 | // to check a possible pending write on the same cache line. |
---|
5193 | // As there is only one possible access per cycle to write buffer, we implement |
---|
5194 | // a round-robin priority between DCACHE and ICACHE for this access, |
---|
5195 | // using the r_vci_cmd_imiss_prio flip-flop. |
---|
5196 | |
---|
5197 | size_t wbuf_min; |
---|
5198 | size_t wbuf_max; |
---|
5199 | |
---|
5200 | bool dcache_miss_req = r_dcache_vci_miss_req.read() and |
---|
5201 | (not r_icache_miss_req.read() or not r_vci_cmd_imiss_prio.read()); |
---|
5202 | |
---|
5203 | bool dcache_ll_req = r_dcache_vci_ll_req.read() and |
---|
5204 | (not r_icache_miss_req.read() or not r_vci_cmd_imiss_prio.read()); |
---|
5205 | |
---|
5206 | bool dcache_sc_req = r_dcache_vci_sc_req.read() and |
---|
5207 | (not r_icache_miss_req.read() or not r_vci_cmd_imiss_prio.read()); |
---|
5208 | |
---|
5209 | bool dcache_cas_req = r_dcache_vci_cas_req.read() and |
---|
5210 | (not r_icache_miss_req.read() or not r_vci_cmd_imiss_prio.read()); |
---|
5211 | |
---|
5212 | bool icache_miss_req = r_icache_miss_req.read() and |
---|
5213 | (not (r_dcache_vci_miss_req.read() or |
---|
5214 | r_dcache_vci_ll_req.read() or |
---|
5215 | r_dcache_vci_cas_req.read() or |
---|
5216 | r_dcache_vci_sc_req.read()) or |
---|
5217 | r_vci_cmd_imiss_prio.read()); |
---|
5218 | |
---|
5219 | // 1 - Data unc write |
---|
5220 | if (r_dcache_vci_unc_req.read() and r_dcache_vci_unc_write.read()) |
---|
5221 | { |
---|
5222 | r_vci_cmd_fsm = CMD_DATA_UNC_WRITE; |
---|
5223 | r_dcache_vci_unc_req = false; |
---|
5224 | } |
---|
5225 | // 2 data read miss |
---|
5226 | else if (dcache_miss_req and r_wbuf.miss(r_dcache_vci_paddr.read())) |
---|
5227 | { |
---|
5228 | r_vci_cmd_fsm = CMD_DATA_MISS; |
---|
5229 | r_dcache_vci_miss_req = false; |
---|
5230 | r_vci_cmd_imiss_prio = true; |
---|
5231 | } |
---|
5232 | // 3 - Data Read Uncachable |
---|
5233 | else if (r_dcache_vci_unc_req.read() and not r_dcache_vci_unc_write.read()) |
---|
5234 | { |
---|
5235 | r_vci_cmd_fsm = CMD_DATA_UNC_READ; |
---|
5236 | r_dcache_vci_unc_req = false; |
---|
5237 | } |
---|
5238 | // 4 - Data Linked Load |
---|
5239 | else if (dcache_ll_req and r_wbuf.miss(r_dcache_vci_paddr.read())) |
---|
5240 | { |
---|
5241 | r_vci_cmd_fsm = CMD_DATA_LL; |
---|
5242 | r_dcache_vci_ll_req = false; |
---|
5243 | r_vci_cmd_imiss_prio = true; |
---|
5244 | } |
---|
5245 | // 5 - Instruction Miss |
---|
5246 | else if (icache_miss_req and r_wbuf.miss(r_icache_vci_paddr.read())) |
---|
5247 | { |
---|
5248 | r_vci_cmd_fsm = CMD_INS_MISS; |
---|
5249 | r_icache_miss_req = false; |
---|
5250 | r_vci_cmd_imiss_prio = false; |
---|
5251 | } |
---|
5252 | // 6 - Instruction Uncachable |
---|
5253 | else if (r_icache_unc_req.read()) |
---|
5254 | { |
---|
5255 | r_vci_cmd_fsm = CMD_INS_UNC; |
---|
5256 | r_icache_unc_req = false; |
---|
5257 | } |
---|
5258 | // 7 - Data Write |
---|
5259 | else if (r_wbuf.rok(&wbuf_min, &wbuf_max)) |
---|
5260 | { |
---|
5261 | r_vci_cmd_fsm = CMD_DATA_WRITE; |
---|
5262 | r_vci_cmd_cpt = wbuf_min; |
---|
5263 | r_vci_cmd_min = wbuf_min; |
---|
5264 | r_vci_cmd_max = wbuf_max; |
---|
5265 | } |
---|
5266 | // 8 - Data Store Conditionnal |
---|
5267 | else if (dcache_sc_req and r_wbuf.miss(r_dcache_vci_paddr.read())) |
---|
5268 | { |
---|
5269 | r_vci_cmd_fsm = CMD_DATA_SC; |
---|
5270 | r_dcache_vci_sc_req = false; |
---|
5271 | r_vci_cmd_imiss_prio = true; |
---|
5272 | r_vci_cmd_cpt = 0; |
---|
5273 | } |
---|
5274 | // 9 - Compare And Swap |
---|
5275 | else if (dcache_cas_req and r_wbuf.miss(r_dcache_vci_paddr.read())) |
---|
5276 | { |
---|
5277 | r_vci_cmd_fsm = CMD_DATA_CAS; |
---|
5278 | r_dcache_vci_cas_req = false; |
---|
5279 | r_vci_cmd_imiss_prio = true; |
---|
5280 | r_vci_cmd_cpt = 0; |
---|
5281 | } |
---|
5282 | |
---|
5283 | #if DEBUG_CMD |
---|
5284 | if (m_debug_cmd_fsm ) |
---|
5285 | { |
---|
5286 | std::cout << " <PROC " << name() << " CMD_IDLE>" |
---|
5287 | << " / dmiss_req = " << dcache_miss_req |
---|
5288 | << " / imiss_req = " << icache_miss_req |
---|
5289 | << std::endl; |
---|
5290 | } |
---|
5291 | #endif |
---|
5292 | break; |
---|
5293 | } |
---|
5294 | //////////////////// |
---|
5295 | case CMD_DATA_WRITE: |
---|
5296 | { |
---|
5297 | if (p_vci.cmdack.read()) |
---|
5298 | { |
---|
5299 | r_vci_cmd_cpt = r_vci_cmd_cpt + 1; |
---|
5300 | if (r_vci_cmd_cpt == r_vci_cmd_max) // last flit sent |
---|
5301 | { |
---|
5302 | r_vci_cmd_fsm = CMD_IDLE; |
---|
5303 | r_wbuf.sent(); |
---|
5304 | } |
---|
5305 | } |
---|
5306 | break; |
---|
5307 | } |
---|
5308 | ///////////////// |
---|
5309 | case CMD_DATA_SC: |
---|
5310 | case CMD_DATA_CAS: |
---|
5311 | { |
---|
5312 | // The CAS and SC VCI commands contain two flits |
---|
5313 | if (p_vci.cmdack.read()) |
---|
5314 | { |
---|
5315 | r_vci_cmd_cpt = r_vci_cmd_cpt + 1; |
---|
5316 | if (r_vci_cmd_cpt == 1) r_vci_cmd_fsm = CMD_IDLE ; |
---|
5317 | } |
---|
5318 | break; |
---|
5319 | } |
---|
5320 | ////////////////// |
---|
5321 | case CMD_INS_MISS: |
---|
5322 | case CMD_INS_UNC: |
---|
5323 | case CMD_DATA_MISS: |
---|
5324 | case CMD_DATA_UNC_READ: |
---|
5325 | case CMD_DATA_UNC_WRITE: |
---|
5326 | case CMD_DATA_LL: |
---|
5327 | { |
---|
5328 | // all read VCI commands contain one single flit |
---|
5329 | if (p_vci.cmdack.read()) { |
---|
5330 | r_vci_cmd_fsm = CMD_IDLE; |
---|
5331 | } |
---|
5332 | break; |
---|
5333 | } |
---|
5334 | |
---|
5335 | } // end switch r_vci_cmd_fsm |
---|
5336 | |
---|
5337 | ////////////////////////////////////////////////////////////////////////// |
---|
5338 | // The VCI_RSP FSM controls the following ressources: |
---|
5339 | // - r_vci_rsp_fsm: |
---|
5340 | // - r_vci_rsp_fifo_icache (push) |
---|
5341 | // - r_vci_rsp_fifo_dcache (push) |
---|
5342 | // - r_vci_rsp_data_error (set) |
---|
5343 | // - r_vci_rsp_ins_error (set) |
---|
5344 | // - r_vci_rsp_cpt |
---|
5345 | // - r_dcache_vci_sc_req (reset when SC response recieved) |
---|
5346 | // |
---|
5347 | // As the VCI_RSP and VCI_CMD are fully desynchronized to support several |
---|
5348 | // simultaneous VCI transactions, this FSM uses the VCI RPKTID field |
---|
5349 | // to identify the transactions. |
---|
5350 | // |
---|
5351 | // VCI vormat: |
---|
5352 | // This component checks the response packet length and accepts only |
---|
5353 | // single word packets for write response packets. |
---|
5354 | // |
---|
5355 | // Error handling: |
---|
5356 | // This FSM analyzes the VCI error code and signals directly the Write Bus Error. |
---|
5357 | // In case of Read Data Error, the VCI_RSP FSM sets the r_vci_rsp_data_error |
---|
5358 | // flip_flop and the error is signaled by the DCACHE FSM. |
---|
5359 | // In case of Instruction Error, the VCI_RSP FSM sets the r_vci_rsp_ins_error |
---|
5360 | // flip_flop and the error is signaled by the ICACHE FSM. |
---|
5361 | // In case of Cleanup Error, the simulation stops with an error message... |
---|
5362 | ////////////////////////////////////////////////////////////////////////// |
---|
5363 | |
---|
5364 | switch (r_vci_rsp_fsm.read()) |
---|
5365 | { |
---|
5366 | ////////////// |
---|
5367 | case RSP_IDLE: |
---|
5368 | { |
---|
5369 | if (p_vci.rspval.read()) |
---|
5370 | { |
---|
5371 | r_vci_rsp_cpt = 0; |
---|
5372 | |
---|
5373 | if ((p_vci.rpktid.read() & 0x7) == TYPE_DATA_UNC) |
---|
5374 | { |
---|
5375 | r_vci_rsp_fsm = RSP_DATA_UNC; |
---|
5376 | } |
---|
5377 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_READ_DATA_MISS) |
---|
5378 | { |
---|
5379 | r_vci_rsp_fsm = RSP_DATA_MISS; |
---|
5380 | } |
---|
5381 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_READ_INS_UNC) |
---|
5382 | { |
---|
5383 | r_vci_rsp_fsm = RSP_INS_UNC; |
---|
5384 | } |
---|
5385 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_READ_INS_MISS) |
---|
5386 | { |
---|
5387 | r_vci_rsp_fsm = RSP_INS_MISS; |
---|
5388 | } |
---|
5389 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_WRITE) |
---|
5390 | { |
---|
5391 | r_vci_rsp_fsm = RSP_DATA_WRITE; |
---|
5392 | } |
---|
5393 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_CAS) |
---|
5394 | { |
---|
5395 | r_vci_rsp_fsm = RSP_DATA_UNC; |
---|
5396 | } |
---|
5397 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_LL) |
---|
5398 | { |
---|
5399 | r_vci_rsp_fsm = RSP_DATA_LL; |
---|
5400 | } |
---|
5401 | else if ((p_vci.rpktid.read() & 0x7) == TYPE_SC) |
---|
5402 | { |
---|
5403 | r_vci_rsp_fsm = RSP_DATA_UNC; |
---|
5404 | } |
---|
5405 | else |
---|
5406 | { |
---|
5407 | assert(false and "Unexpected VCI response"); |
---|
5408 | } |
---|
5409 | } |
---|
5410 | break; |
---|
5411 | } |
---|
5412 | ////////////////// |
---|
5413 | case RSP_INS_MISS: |
---|
5414 | { |
---|
5415 | if (p_vci.rspval.read()) |
---|
5416 | { |
---|
5417 | if ((p_vci.rerror.read() & 0x1) != 0) // error reported |
---|
5418 | { |
---|
5419 | r_vci_rsp_ins_error = true; |
---|
5420 | if (p_vci.reop.read()) r_vci_rsp_fsm = RSP_IDLE; |
---|
5421 | } |
---|
5422 | else // no error reported |
---|
5423 | { |
---|
5424 | if (r_vci_rsp_fifo_icache.wok()) |
---|
5425 | { |
---|
5426 | if (r_vci_rsp_cpt.read() >= m_icache_words) |
---|
5427 | { |
---|
5428 | std::cout << "ERROR in VCI_CC_VCACHE " << name() |
---|
5429 | << " VCI response packet too long " |
---|
5430 | << " for instruction miss" << std::endl; |
---|
5431 | exit(0); |
---|
5432 | } |
---|
5433 | r_vci_rsp_cpt = r_vci_rsp_cpt.read() + 1; |
---|
5434 | vci_rsp_fifo_icache_put = true, |
---|
5435 | vci_rsp_fifo_icache_data = p_vci.rdata.read(); |
---|
5436 | if (p_vci.reop.read()) |
---|
5437 | { |
---|
5438 | if (r_vci_rsp_cpt.read() != (m_icache_words - 1)) |
---|
5439 | { |
---|
5440 | std::cout << "ERROR in VCI_CC_VCACHE " << name() |
---|
5441 | << " VCI response packet too short" |
---|
5442 | << " for instruction miss" << std::endl; |
---|
5443 | exit(0); |
---|
5444 | } |
---|
5445 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5446 | } |
---|
5447 | } |
---|
5448 | } |
---|
5449 | } |
---|
5450 | break; |
---|
5451 | } |
---|
5452 | ///////////////// |
---|
5453 | case RSP_INS_UNC: |
---|
5454 | { |
---|
5455 | if (p_vci.rspval.read()) |
---|
5456 | { |
---|
5457 | assert(p_vci.reop.read() and |
---|
5458 | "illegal VCI response packet for uncachable instruction"); |
---|
5459 | |
---|
5460 | if ((p_vci.rerror.read() & 0x1) != 0) // error reported |
---|
5461 | { |
---|
5462 | r_vci_rsp_ins_error = true; |
---|
5463 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5464 | } |
---|
5465 | else // no error reported |
---|
5466 | { |
---|
5467 | if (r_vci_rsp_fifo_icache.wok()) |
---|
5468 | { |
---|
5469 | vci_rsp_fifo_icache_put = true; |
---|
5470 | vci_rsp_fifo_icache_data = p_vci.rdata.read(); |
---|
5471 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5472 | } |
---|
5473 | } |
---|
5474 | } |
---|
5475 | break; |
---|
5476 | } |
---|
5477 | /////////////////// |
---|
5478 | case RSP_DATA_MISS: |
---|
5479 | { |
---|
5480 | if (p_vci.rspval.read()) |
---|
5481 | { |
---|
5482 | if ((p_vci.rerror.read() & 0x1) != 0) // error reported |
---|
5483 | { |
---|
5484 | r_vci_rsp_data_error = true; |
---|
5485 | if (p_vci.reop.read()) r_vci_rsp_fsm = RSP_IDLE; |
---|
5486 | } |
---|
5487 | else // no error reported |
---|
5488 | { |
---|
5489 | if (r_vci_rsp_fifo_dcache.wok()) |
---|
5490 | { |
---|
5491 | assert((r_vci_rsp_cpt.read() < m_dcache_words) and |
---|
5492 | "The VCI response packet for data miss is too long"); |
---|
5493 | |
---|
5494 | r_vci_rsp_cpt = r_vci_rsp_cpt.read() + 1; |
---|
5495 | vci_rsp_fifo_dcache_put = true, |
---|
5496 | vci_rsp_fifo_dcache_data = p_vci.rdata.read(); |
---|
5497 | if (p_vci.reop.read()) |
---|
5498 | { |
---|
5499 | assert((r_vci_rsp_cpt.read() == m_dcache_words - 1) and |
---|
5500 | "The VCI response packet for data miss is too short"); |
---|
5501 | |
---|
5502 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5503 | } |
---|
5504 | } |
---|
5505 | } |
---|
5506 | } |
---|
5507 | break; |
---|
5508 | } |
---|
5509 | ////////////////// |
---|
5510 | case RSP_DATA_UNC: |
---|
5511 | { |
---|
5512 | if (p_vci.rspval.read()) |
---|
5513 | { |
---|
5514 | assert(p_vci.reop.read() and |
---|
5515 | "illegal VCI response packet for uncachable read data"); |
---|
5516 | |
---|
5517 | if ((p_vci.rerror.read() & 0x1) != 0) // error reported |
---|
5518 | { |
---|
5519 | r_vci_rsp_data_error = true; |
---|
5520 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5521 | } |
---|
5522 | else // no error reported |
---|
5523 | { |
---|
5524 | if (r_vci_rsp_fifo_dcache.wok()) |
---|
5525 | { |
---|
5526 | vci_rsp_fifo_dcache_put = true; |
---|
5527 | vci_rsp_fifo_dcache_data = p_vci.rdata.read(); |
---|
5528 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5529 | } |
---|
5530 | } |
---|
5531 | } |
---|
5532 | break; |
---|
5533 | } |
---|
5534 | ///////////////// |
---|
5535 | case RSP_DATA_LL: |
---|
5536 | { |
---|
5537 | if (p_vci.rspval.read()) |
---|
5538 | { |
---|
5539 | if ((p_vci.rerror.read() & 0x1) != 0) // error reported |
---|
5540 | { |
---|
5541 | r_vci_rsp_data_error = true; |
---|
5542 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5543 | break; |
---|
5544 | } |
---|
5545 | if (r_vci_rsp_cpt.read() == 0) //first flit |
---|
5546 | { |
---|
5547 | if (r_vci_rsp_fifo_dcache.wok()) |
---|
5548 | { |
---|
5549 | assert(!p_vci.reop.read() && |
---|
5550 | "illegal VCI response packet for LL"); |
---|
5551 | vci_rsp_fifo_dcache_put = true; |
---|
5552 | vci_rsp_fifo_dcache_data = p_vci.rdata.read(); |
---|
5553 | r_vci_rsp_cpt = r_vci_rsp_cpt.read() + 1; |
---|
5554 | } |
---|
5555 | break; |
---|
5556 | } |
---|
5557 | else // last flit |
---|
5558 | { |
---|
5559 | if (r_vci_rsp_fifo_dcache.wok()) |
---|
5560 | { |
---|
5561 | assert(p_vci.reop.read() && |
---|
5562 | "illegal VCI response packet for LL"); |
---|
5563 | vci_rsp_fifo_dcache_put = true; |
---|
5564 | vci_rsp_fifo_dcache_data = p_vci.rdata.read(); |
---|
5565 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5566 | } |
---|
5567 | break; |
---|
5568 | } |
---|
5569 | } |
---|
5570 | break; |
---|
5571 | } |
---|
5572 | //////////////////// |
---|
5573 | case RSP_DATA_WRITE: |
---|
5574 | { |
---|
5575 | if (p_vci.rspval.read()) |
---|
5576 | { |
---|
5577 | assert(p_vci.reop.read() and |
---|
5578 | "a VCI response packet must contain one flit for a write transaction"); |
---|
5579 | |
---|
5580 | r_vci_rsp_fsm = RSP_IDLE; |
---|
5581 | uint32_t wbuf_index = p_vci.rtrdid.read(); |
---|
5582 | r_wbuf.completed(wbuf_index); |
---|
5583 | if ((p_vci.rerror.read() & 0x1) != 0) r_iss.setWriteBerr(); |
---|
5584 | } |
---|
5585 | break; |
---|
5586 | } |
---|
5587 | } // end switch r_vci_rsp_fsm |
---|
5588 | |
---|
5589 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
5590 | // The CC_SEND FSM is in charge of sending cleanups and the multicast |
---|
5591 | // acknowledgements on the coherence network. It has two clients (DCACHE FSM |
---|
5592 | // and ICACHE FSM) that are served with a round-robin priority. |
---|
5593 | // The CC_SEND FSM resets the r_*cache_cc_send_req request flip-flops as |
---|
5594 | // soon as the request has been sent. |
---|
5595 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
5596 | switch (r_cc_send_fsm.read()) |
---|
5597 | { |
---|
5598 | /////////////////////////// |
---|
5599 | case CC_SEND_IDLE: |
---|
5600 | { |
---|
5601 | /////////////////////////////////////////////////////// |
---|
5602 | // handling round robin between icache and dcache : // |
---|
5603 | // we first check for the last client and listen for // |
---|
5604 | // a request of the other, then update the client // |
---|
5605 | // r_cc_send_last_client : 0 dcache / 1 icache |
---|
5606 | /////////////////////////////////////////////////////// |
---|
5607 | bool update_last_client = r_cc_send_last_client.read(); |
---|
5608 | if (r_cc_send_last_client.read() == 0) // last client was dcache |
---|
5609 | { |
---|
5610 | if (r_icache_cc_send_req.read()) // request from icache |
---|
5611 | update_last_client = 1; // update last client to icache |
---|
5612 | } |
---|
5613 | else // last client was icache |
---|
5614 | { |
---|
5615 | if (r_dcache_cc_send_req.read()) // request from dcache |
---|
5616 | update_last_client = 0; // update last client to dcache |
---|
5617 | } |
---|
5618 | r_cc_send_last_client = update_last_client; |
---|
5619 | |
---|
5620 | // if there is an actual request |
---|
5621 | if (r_dcache_cc_send_req.read() or r_icache_cc_send_req.read()) |
---|
5622 | { |
---|
5623 | // the new client is dcache and has a cleanup request |
---|
5624 | if ((update_last_client == 0) and |
---|
5625 | (r_dcache_cc_send_type.read() == CC_TYPE_CLEANUP)) |
---|
5626 | r_cc_send_fsm = CC_SEND_CLEANUP_1; |
---|
5627 | // the new client is dcache and has a multi acknowledgement request |
---|
5628 | else if ((update_last_client == 0) and |
---|
5629 | (r_dcache_cc_send_type.read() == CC_TYPE_MULTI_ACK)) |
---|
5630 | r_cc_send_fsm = CC_SEND_MULTI_ACK; |
---|
5631 | // the new client is icache and has a cleanup request |
---|
5632 | else if ((update_last_client == 1) and |
---|
5633 | (r_icache_cc_send_type.read() == CC_TYPE_CLEANUP)) |
---|
5634 | r_cc_send_fsm = CC_SEND_CLEANUP_1; |
---|
5635 | // the new client is icache and has a multi acknowledgement request |
---|
5636 | else if ((update_last_client == 1) and |
---|
5637 | (r_icache_cc_send_type.read() == CC_TYPE_MULTI_ACK)) |
---|
5638 | r_cc_send_fsm = CC_SEND_MULTI_ACK; |
---|
5639 | } |
---|
5640 | break; |
---|
5641 | } |
---|
5642 | /////////////////////////// |
---|
5643 | case CC_SEND_CLEANUP_1: |
---|
5644 | { |
---|
5645 | // wait for the first flit to be consumed |
---|
5646 | if (p_dspin_p2m.read.read()) |
---|
5647 | r_cc_send_fsm = CC_SEND_CLEANUP_2; |
---|
5648 | |
---|
5649 | break; |
---|
5650 | } |
---|
5651 | /////////////////////////// |
---|
5652 | case CC_SEND_CLEANUP_2: |
---|
5653 | { |
---|
5654 | // wait for the second flit to be consumed |
---|
5655 | if (p_dspin_p2m.read.read()) |
---|
5656 | { |
---|
5657 | if (r_cc_send_last_client.read() == 0) // dcache active request |
---|
5658 | r_dcache_cc_send_req = false; // reset dcache request |
---|
5659 | else // icache active request |
---|
5660 | r_icache_cc_send_req = false; // reset icache request |
---|
5661 | |
---|
5662 | // go back to idle state |
---|
5663 | r_cc_send_fsm = CC_SEND_IDLE; |
---|
5664 | } |
---|
5665 | break; |
---|
5666 | } |
---|
5667 | /////////////////////////// |
---|
5668 | case CC_SEND_MULTI_ACK: |
---|
5669 | { |
---|
5670 | // wait for the flit to be consumed |
---|
5671 | if (p_dspin_p2m.read.read()) |
---|
5672 | { |
---|
5673 | if (r_cc_send_last_client.read() == 0) // dcache active request |
---|
5674 | r_dcache_cc_send_req = false; // reset dcache request |
---|
5675 | else // icache active request |
---|
5676 | r_icache_cc_send_req = false; // reset icache request |
---|
5677 | // go back to idle state |
---|
5678 | r_cc_send_fsm = CC_SEND_IDLE; |
---|
5679 | } |
---|
5680 | break; |
---|
5681 | } |
---|
5682 | } // end switch CC_SEND FSM |
---|
5683 | |
---|
5684 | /////////////////////////////////////////////////////////////////////////////// |
---|
5685 | // CC_RECEIVE FSM |
---|
5686 | // This FSM receive all coherence packets on a DSPIN40 port. |
---|
5687 | // There is 5 packet types: |
---|
5688 | // - CC_DATA_INVAL : DCACHE invalidate request |
---|
5689 | // - CC_DATA_UPDT : DCACHE update request (multi-words) |
---|
5690 | // - CC_INST_INVAL : ICACHE invalidate request |
---|
5691 | // - CC_INST_UPDT : ICACHE update request (multi-words) |
---|
5692 | // - CC_BROADCAST : Broadcast invalidate request (both DCACHE & ICACHE) |
---|
5693 | ////////////////////////////////////////////////////////////////////////////// |
---|
5694 | switch (r_cc_receive_fsm.read()) |
---|
5695 | { |
---|
5696 | ///////////////////// |
---|
5697 | case CC_RECEIVE_IDLE: |
---|
5698 | { |
---|
5699 | // a coherence request has arrived |
---|
5700 | if (p_dspin_m2p.write.read()) |
---|
5701 | { |
---|
5702 | // initialize dspin received data |
---|
5703 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5704 | // initialize coherence packet type |
---|
5705 | uint64_t receive_type = DspinDhccpParam::dspin_get(receive_data, |
---|
5706 | DspinDhccpParam::M2P_TYPE); |
---|
5707 | // test for a broadcast |
---|
5708 | if (DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::M2P_BC)) |
---|
5709 | { |
---|
5710 | r_cc_receive_fsm = CC_RECEIVE_BRDCAST_HEADER; |
---|
5711 | } |
---|
5712 | // test for a multi updt |
---|
5713 | else if (receive_type == DspinDhccpParam::TYPE_MULTI_UPDT_DATA) |
---|
5714 | { |
---|
5715 | r_cc_receive_fsm = CC_RECEIVE_DATA_UPDT_HEADER; |
---|
5716 | } |
---|
5717 | else if (receive_type == DspinDhccpParam::TYPE_MULTI_UPDT_INST) |
---|
5718 | { |
---|
5719 | r_cc_receive_fsm = CC_RECEIVE_INS_UPDT_HEADER; |
---|
5720 | } |
---|
5721 | // test for a multi inval |
---|
5722 | else if (receive_type == DspinDhccpParam::TYPE_MULTI_INVAL_DATA) |
---|
5723 | { |
---|
5724 | r_cc_receive_fsm = CC_RECEIVE_DATA_INVAL_HEADER; |
---|
5725 | } |
---|
5726 | else |
---|
5727 | { |
---|
5728 | r_cc_receive_fsm = CC_RECEIVE_INS_INVAL_HEADER; |
---|
5729 | } |
---|
5730 | } |
---|
5731 | break; |
---|
5732 | } |
---|
5733 | /////////////////////////////// |
---|
5734 | case CC_RECEIVE_BRDCAST_HEADER: |
---|
5735 | { |
---|
5736 | // no actual data in the HEADER, just skip to second flit |
---|
5737 | r_cc_receive_fsm = CC_RECEIVE_BRDCAST_NLINE; |
---|
5738 | break; |
---|
5739 | } |
---|
5740 | ////////////////////////////// |
---|
5741 | case CC_RECEIVE_BRDCAST_NLINE: |
---|
5742 | { |
---|
5743 | // initialize dspin received data |
---|
5744 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5745 | // wait for both dcache and icache to take the request |
---|
5746 | // TODO maybe we need to wait for both only to leave the state, but |
---|
5747 | // not to actually post a request to an available cache => need a |
---|
5748 | // flip_flop to check that ? |
---|
5749 | if (not (r_cc_receive_icache_req.read()) and |
---|
5750 | not (r_cc_receive_dcache_req.read()) and |
---|
5751 | (p_dspin_m2p.write.read())) |
---|
5752 | { |
---|
5753 | // request dcache to handle the BROADCAST |
---|
5754 | r_cc_receive_dcache_req = true; |
---|
5755 | r_cc_receive_dcache_nline = DspinDhccpParam::dspin_get(receive_data, |
---|
5756 | DspinDhccpParam::BROADCAST_NLINE); |
---|
5757 | r_cc_receive_dcache_type = CC_TYPE_INVAL; |
---|
5758 | // request icache to handle the BROADCAST |
---|
5759 | r_cc_receive_icache_req = true; |
---|
5760 | r_cc_receive_icache_nline = DspinDhccpParam::dspin_get(receive_data, |
---|
5761 | DspinDhccpParam::BROADCAST_NLINE); |
---|
5762 | r_cc_receive_icache_type = CC_TYPE_INVAL; |
---|
5763 | // get back to idle state |
---|
5764 | r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
5765 | break; |
---|
5766 | } |
---|
5767 | // keep waiting for the caches to accept the request |
---|
5768 | break; |
---|
5769 | } |
---|
5770 | ///////////////////////////// |
---|
5771 | case CC_RECEIVE_DATA_INVAL_HEADER: |
---|
5772 | { |
---|
5773 | // sample updt tab index in the HEADER, then skip to second flit |
---|
5774 | r_cc_receive_fsm = CC_RECEIVE_DATA_INVAL_NLINE; |
---|
5775 | break; |
---|
5776 | } |
---|
5777 | ///////////////////////////// |
---|
5778 | case CC_RECEIVE_INS_INVAL_HEADER: |
---|
5779 | { |
---|
5780 | // sample updt tab index in the HEADER, then skip to second flit |
---|
5781 | r_cc_receive_fsm = CC_RECEIVE_INS_INVAL_NLINE; |
---|
5782 | break; |
---|
5783 | } |
---|
5784 | //////////////////////////// |
---|
5785 | case CC_RECEIVE_DATA_INVAL_NLINE: |
---|
5786 | { |
---|
5787 | // sample nline in the second flit |
---|
5788 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5789 | // for data INVAL, wait for dcache to take the request |
---|
5790 | if (p_dspin_m2p.write.read() and |
---|
5791 | not r_cc_receive_dcache_req.read()) |
---|
5792 | { |
---|
5793 | // request dcache to handle the INVAL |
---|
5794 | r_cc_receive_dcache_req = true; |
---|
5795 | r_cc_receive_dcache_nline = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_INVAL_NLINE); |
---|
5796 | r_cc_receive_dcache_type = CC_TYPE_INVAL; |
---|
5797 | // get back to idle state |
---|
5798 | r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
5799 | break; |
---|
5800 | } |
---|
5801 | break; |
---|
5802 | } |
---|
5803 | ////////////////////////////// |
---|
5804 | case CC_RECEIVE_INS_INVAL_NLINE: |
---|
5805 | { |
---|
5806 | // sample nline in the second flit |
---|
5807 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5808 | // for ins INVAL, wait for icache to take the request |
---|
5809 | if (p_dspin_m2p.write.read() and |
---|
5810 | not r_cc_receive_icache_req.read()) |
---|
5811 | { |
---|
5812 | // request icache to handle the INVAL |
---|
5813 | r_cc_receive_icache_req = true; |
---|
5814 | r_cc_receive_icache_nline = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_INVAL_NLINE); |
---|
5815 | r_cc_receive_icache_type = CC_TYPE_INVAL; |
---|
5816 | // get back to idle state |
---|
5817 | r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
5818 | break; |
---|
5819 | } |
---|
5820 | break; |
---|
5821 | } |
---|
5822 | //////////////////////////// |
---|
5823 | case CC_RECEIVE_DATA_UPDT_HEADER: |
---|
5824 | { |
---|
5825 | // sample updt tab index in the HEADER, than skip to second flit |
---|
5826 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5827 | // for data INVAL, wait for dcache to take the request and fifo to |
---|
5828 | // be empty |
---|
5829 | if (not r_cc_receive_dcache_req.read()) |
---|
5830 | { |
---|
5831 | r_cc_receive_dcache_updt_tab_idx = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_UPDT_INDEX); |
---|
5832 | r_cc_receive_fsm = CC_RECEIVE_DATA_UPDT_NLINE; |
---|
5833 | break; |
---|
5834 | } |
---|
5835 | break; |
---|
5836 | } |
---|
5837 | //////////////////////////// |
---|
5838 | case CC_RECEIVE_INS_UPDT_HEADER: |
---|
5839 | { |
---|
5840 | // sample updt tab index in the HEADER, than skip to second flit |
---|
5841 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5842 | // for ins INVAL, wait for icache to take the request and fifo to be |
---|
5843 | // empty |
---|
5844 | if (not r_cc_receive_icache_req.read()) |
---|
5845 | { |
---|
5846 | r_cc_receive_icache_updt_tab_idx = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_UPDT_INDEX); |
---|
5847 | r_cc_receive_fsm = CC_RECEIVE_INS_UPDT_NLINE; |
---|
5848 | break; |
---|
5849 | } |
---|
5850 | // keep waiting for the correct cache to accept the request |
---|
5851 | break; |
---|
5852 | } |
---|
5853 | /////////////////////////// |
---|
5854 | case CC_RECEIVE_DATA_UPDT_NLINE: |
---|
5855 | { |
---|
5856 | // sample nline and word index in the second flit |
---|
5857 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5858 | // for data INVAL, wait for dcache to take the request and fifo to |
---|
5859 | // be empty |
---|
5860 | if (r_cc_receive_updt_fifo_be.empty() and |
---|
5861 | p_dspin_m2p.write.read()) |
---|
5862 | { |
---|
5863 | r_cc_receive_dcache_req = true; |
---|
5864 | r_cc_receive_dcache_nline = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_NLINE); |
---|
5865 | r_cc_receive_word_idx = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_WORD_INDEX); |
---|
5866 | r_cc_receive_dcache_type = CC_TYPE_UPDT; |
---|
5867 | // get back to idle state |
---|
5868 | r_cc_receive_fsm = CC_RECEIVE_DATA_UPDT_DATA; |
---|
5869 | break; |
---|
5870 | } |
---|
5871 | break; |
---|
5872 | } |
---|
5873 | //////////////////////////// |
---|
5874 | case CC_RECEIVE_INS_UPDT_NLINE: |
---|
5875 | { |
---|
5876 | // sample nline and word index in the second flit |
---|
5877 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5878 | // for ins INVAL, wait for icache to take the request and fifo to be |
---|
5879 | // empty |
---|
5880 | if (r_cc_receive_updt_fifo_be.empty() and |
---|
5881 | p_dspin_m2p.write.read()) |
---|
5882 | { |
---|
5883 | r_cc_receive_icache_req = true; |
---|
5884 | r_cc_receive_icache_nline = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_NLINE); |
---|
5885 | r_cc_receive_word_idx = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_WORD_INDEX); |
---|
5886 | r_cc_receive_icache_type = CC_TYPE_UPDT; |
---|
5887 | // get back to idle state |
---|
5888 | r_cc_receive_fsm = CC_RECEIVE_INS_UPDT_DATA; |
---|
5889 | break; |
---|
5890 | } |
---|
5891 | break; |
---|
5892 | } |
---|
5893 | ////////////////////////// |
---|
5894 | case CC_RECEIVE_DATA_UPDT_DATA: |
---|
5895 | { |
---|
5896 | // wait for the fifo |
---|
5897 | if (r_cc_receive_updt_fifo_be.wok() and (p_dspin_m2p.write.read())) |
---|
5898 | { |
---|
5899 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5900 | bool receive_eop = p_dspin_m2p.eop.read(); |
---|
5901 | cc_receive_updt_fifo_be = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_BE); |
---|
5902 | cc_receive_updt_fifo_data = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_DATA); |
---|
5903 | cc_receive_updt_fifo_eop = receive_eop; |
---|
5904 | cc_receive_updt_fifo_put = true; |
---|
5905 | if (receive_eop ) r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
5906 | } |
---|
5907 | break; |
---|
5908 | } |
---|
5909 | ////////////////////////// |
---|
5910 | case CC_RECEIVE_INS_UPDT_DATA: |
---|
5911 | { |
---|
5912 | // wait for the fifo |
---|
5913 | if (r_cc_receive_updt_fifo_be.wok() and (p_dspin_m2p.write.read())) |
---|
5914 | { |
---|
5915 | uint64_t receive_data = p_dspin_m2p.data.read(); |
---|
5916 | bool receive_eop = p_dspin_m2p.eop.read(); |
---|
5917 | cc_receive_updt_fifo_be = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_BE); |
---|
5918 | cc_receive_updt_fifo_data = DspinDhccpParam::dspin_get(receive_data,DspinDhccpParam::MULTI_UPDT_DATA); |
---|
5919 | cc_receive_updt_fifo_eop = receive_eop; |
---|
5920 | cc_receive_updt_fifo_put = true; |
---|
5921 | if (receive_eop ) r_cc_receive_fsm = CC_RECEIVE_IDLE; |
---|
5922 | } |
---|
5923 | break; |
---|
5924 | } |
---|
5925 | |
---|
5926 | } // end switch CC_RECEIVE FSM |
---|
5927 | |
---|
5928 | ///////////////// DSPIN CLACK interface /////////////// |
---|
5929 | |
---|
5930 | uint64_t clack_type = DspinDhccpParam::dspin_get(r_dspin_clack_flit.read(), |
---|
5931 | DspinDhccpParam::CLACK_TYPE); |
---|
5932 | |
---|
5933 | size_t clack_way = DspinDhccpParam::dspin_get(r_dspin_clack_flit.read(), |
---|
5934 | DspinDhccpParam::CLACK_WAY); |
---|
5935 | |
---|
5936 | size_t clack_set = DspinDhccpParam::dspin_get(r_dspin_clack_flit.read(), |
---|
5937 | DspinDhccpParam::CLACK_SET); |
---|
5938 | |
---|
5939 | bool dspin_clack_get = false; |
---|
5940 | bool dcache_clack_request = (clack_type == DspinDhccpParam::TYPE_CLACK_DATA); |
---|
5941 | bool icache_clack_request = (clack_type == DspinDhccpParam::TYPE_CLACK_INST); |
---|
5942 | |
---|
5943 | if (r_dspin_clack_req.read()) |
---|
5944 | { |
---|
5945 | // CLACK DATA: Send request to DCACHE FSM |
---|
5946 | if (dcache_clack_request and not r_dcache_clack_req.read()) |
---|
5947 | { |
---|
5948 | r_dcache_clack_req = true; |
---|
5949 | r_dcache_clack_way = clack_way & ((1ULL << (uint32_log2(m_dcache_ways))) - 1); |
---|
5950 | r_dcache_clack_set = clack_set & ((1ULL << (uint32_log2(m_dcache_sets))) - 1); |
---|
5951 | dspin_clack_get = true; |
---|
5952 | } |
---|
5953 | |
---|
5954 | // CLACK INST: Send request to ICACHE FSM |
---|
5955 | else if (icache_clack_request and not r_icache_clack_req.read()) |
---|
5956 | { |
---|
5957 | r_icache_clack_req = true; |
---|
5958 | r_icache_clack_way = clack_way & ((1ULL<<(uint32_log2(m_dcache_ways)))-1); |
---|
5959 | r_icache_clack_set = clack_set & ((1ULL<<(uint32_log2(m_icache_sets)))-1); |
---|
5960 | dspin_clack_get = true; |
---|
5961 | } |
---|
5962 | } |
---|
5963 | else |
---|
5964 | { |
---|
5965 | dspin_clack_get = true; |
---|
5966 | } |
---|
5967 | |
---|
5968 | if (dspin_clack_get) |
---|
5969 | { |
---|
5970 | r_dspin_clack_req = p_dspin_clack.write.read(); |
---|
5971 | r_dspin_clack_flit = p_dspin_clack.data.read(); |
---|
5972 | } |
---|
5973 | |
---|
5974 | ///////////////// Response FIFOs update ////////////////////// |
---|
5975 | r_vci_rsp_fifo_icache.update(vci_rsp_fifo_icache_get, |
---|
5976 | vci_rsp_fifo_icache_put, |
---|
5977 | vci_rsp_fifo_icache_data); |
---|
5978 | |
---|
5979 | r_vci_rsp_fifo_dcache.update(vci_rsp_fifo_dcache_get, |
---|
5980 | vci_rsp_fifo_dcache_put, |
---|
5981 | vci_rsp_fifo_dcache_data); |
---|
5982 | |
---|
5983 | ///////////////// updt FIFO update ////////////////////// |
---|
5984 | //TODO check this |
---|
5985 | r_cc_receive_updt_fifo_be.update(cc_receive_updt_fifo_get, |
---|
5986 | cc_receive_updt_fifo_put, |
---|
5987 | cc_receive_updt_fifo_be); |
---|
5988 | r_cc_receive_updt_fifo_data.update(cc_receive_updt_fifo_get, |
---|
5989 | cc_receive_updt_fifo_put, |
---|
5990 | cc_receive_updt_fifo_data); |
---|
5991 | r_cc_receive_updt_fifo_eop.update(cc_receive_updt_fifo_get, |
---|
5992 | cc_receive_updt_fifo_put, |
---|
5993 | cc_receive_updt_fifo_eop); |
---|
5994 | |
---|
5995 | } // end transition() |
---|
5996 | |
---|
5997 | /////////////////////// |
---|
5998 | tmpl(void)::genMoore() |
---|
5999 | /////////////////////// |
---|
6000 | { |
---|
6001 | |
---|
6002 | // VCI initiator command on the direct network |
---|
6003 | // it depends on the CMD FSM state |
---|
6004 | |
---|
6005 | bool is_sc_or_cas = (r_vci_cmd_fsm.read() == CMD_DATA_CAS) or |
---|
6006 | (r_vci_cmd_fsm.read() == CMD_DATA_SC); |
---|
6007 | |
---|
6008 | p_vci.pktid = 0; |
---|
6009 | p_vci.srcid = m_srcid; |
---|
6010 | p_vci.cons = is_sc_or_cas; |
---|
6011 | p_vci.contig = not is_sc_or_cas; |
---|
6012 | p_vci.wrap = false; |
---|
6013 | p_vci.clen = 0; |
---|
6014 | p_vci.cfixed = false; |
---|
6015 | |
---|
6016 | if (m_monitor_ok) { |
---|
6017 | if (p_vci.cmdack.read() == true and p_vci.cmdval == true) { |
---|
6018 | if (((p_vci.address.read()) >= m_monitor_base) and |
---|
6019 | ((p_vci.address.read()) < m_monitor_base + m_monitor_length)) { |
---|
6020 | std::cout << "CC_VCACHE Monitor " << name() << std::hex |
---|
6021 | << " Access type = " << vci_cmd_type_str[p_vci.cmd.read()] |
---|
6022 | << " Pktid type = " << vci_pktid_type_str[p_vci.pktid.read()] |
---|
6023 | << " : address = " << p_vci.address.read() |
---|
6024 | << " / be = " << p_vci.be.read(); |
---|
6025 | if (p_vci.cmd.read() == vci_param::CMD_WRITE ) { |
---|
6026 | std::cout << " / data = " << p_vci.wdata.read(); |
---|
6027 | } |
---|
6028 | std::cout << std::dec << std::endl; |
---|
6029 | } |
---|
6030 | } |
---|
6031 | } |
---|
6032 | |
---|
6033 | switch (r_vci_cmd_fsm.read()) { |
---|
6034 | |
---|
6035 | case CMD_IDLE: |
---|
6036 | p_vci.cmdval = false; |
---|
6037 | p_vci.address = 0; |
---|
6038 | p_vci.wdata = 0; |
---|
6039 | p_vci.be = 0; |
---|
6040 | p_vci.trdid = 0; |
---|
6041 | p_vci.pktid = 0; |
---|
6042 | p_vci.plen = 0; |
---|
6043 | p_vci.cmd = vci_param::CMD_NOP; |
---|
6044 | p_vci.eop = false; |
---|
6045 | break; |
---|
6046 | |
---|
6047 | case CMD_INS_MISS: |
---|
6048 | p_vci.cmdval = true; |
---|
6049 | p_vci.address = r_icache_vci_paddr.read() & m_icache_yzmask; |
---|
6050 | p_vci.wdata = 0; |
---|
6051 | p_vci.be = 0xF; |
---|
6052 | p_vci.trdid = 0; |
---|
6053 | p_vci.pktid = TYPE_READ_INS_MISS; |
---|
6054 | p_vci.plen = m_icache_words << 2; |
---|
6055 | p_vci.cmd = vci_param::CMD_READ; |
---|
6056 | p_vci.eop = true; |
---|
6057 | break; |
---|
6058 | |
---|
6059 | case CMD_INS_UNC: |
---|
6060 | p_vci.cmdval = true; |
---|
6061 | p_vci.address = r_icache_vci_paddr.read() & ~0x3; |
---|
6062 | p_vci.wdata = 0; |
---|
6063 | p_vci.be = 0xF; |
---|
6064 | p_vci.trdid = 0; |
---|
6065 | p_vci.pktid = TYPE_READ_INS_UNC; |
---|
6066 | p_vci.plen = 4; |
---|
6067 | p_vci.cmd = vci_param::CMD_READ; |
---|
6068 | p_vci.eop = true; |
---|
6069 | break; |
---|
6070 | |
---|
6071 | case CMD_DATA_MISS: |
---|
6072 | p_vci.cmdval = true; |
---|
6073 | p_vci.address = r_dcache_vci_paddr.read() & m_dcache_yzmask; |
---|
6074 | p_vci.wdata = 0; |
---|
6075 | p_vci.be = 0xF; |
---|
6076 | p_vci.trdid = 0; |
---|
6077 | p_vci.pktid = TYPE_READ_DATA_MISS; |
---|
6078 | p_vci.plen = m_dcache_words << 2; |
---|
6079 | p_vci.cmd = vci_param::CMD_READ; |
---|
6080 | p_vci.eop = true; |
---|
6081 | break; |
---|
6082 | |
---|
6083 | case CMD_DATA_UNC_READ: |
---|
6084 | p_vci.cmdval = true; |
---|
6085 | p_vci.address = r_dcache_vci_paddr.read() & ~0x3; |
---|
6086 | p_vci.wdata = 0; |
---|
6087 | p_vci.be = r_dcache_vci_unc_be.read(); |
---|
6088 | p_vci.trdid = 0; |
---|
6089 | p_vci.pktid = TYPE_DATA_UNC; |
---|
6090 | p_vci.plen = 4; |
---|
6091 | p_vci.cmd = vci_param::CMD_READ; |
---|
6092 | p_vci.eop = true; |
---|
6093 | break; |
---|
6094 | |
---|
6095 | case CMD_DATA_UNC_WRITE: |
---|
6096 | p_vci.cmdval = true; |
---|
6097 | p_vci.address = r_dcache_vci_paddr.read() & ~0x3; |
---|
6098 | p_vci.wdata = r_dcache_vci_wdata.read(); |
---|
6099 | p_vci.be = r_dcache_vci_unc_be.read(); |
---|
6100 | p_vci.trdid = 0; |
---|
6101 | p_vci.pktid = TYPE_DATA_UNC; |
---|
6102 | p_vci.plen = 4; |
---|
6103 | p_vci.cmd = vci_param::CMD_WRITE; |
---|
6104 | p_vci.eop = true; |
---|
6105 | break; |
---|
6106 | |
---|
6107 | case CMD_DATA_WRITE: |
---|
6108 | p_vci.cmdval = true; |
---|
6109 | p_vci.address = r_wbuf.getAddress(r_vci_cmd_cpt.read()) & ~0x3; |
---|
6110 | p_vci.wdata = r_wbuf.getData(r_vci_cmd_cpt.read()); |
---|
6111 | p_vci.be = r_wbuf.getBe(r_vci_cmd_cpt.read()); |
---|
6112 | p_vci.trdid = r_wbuf.getIndex(); |
---|
6113 | p_vci.pktid = TYPE_WRITE; |
---|
6114 | p_vci.plen = (r_vci_cmd_max.read() - r_vci_cmd_min.read() + 1) << 2; |
---|
6115 | p_vci.cmd = vci_param::CMD_WRITE; |
---|
6116 | p_vci.eop = (r_vci_cmd_cpt.read() == r_vci_cmd_max.read()); |
---|
6117 | break; |
---|
6118 | |
---|
6119 | case CMD_DATA_LL: |
---|
6120 | p_vci.cmdval = true; |
---|
6121 | p_vci.address = r_dcache_vci_paddr.read() & ~0x3; |
---|
6122 | p_vci.wdata = 0; |
---|
6123 | p_vci.be = 0xF; |
---|
6124 | p_vci.trdid = 0; |
---|
6125 | p_vci.pktid = TYPE_LL; |
---|
6126 | p_vci.plen = 8; |
---|
6127 | p_vci.cmd = vci_param::CMD_LOCKED_READ; |
---|
6128 | p_vci.eop = true; |
---|
6129 | break; |
---|
6130 | |
---|
6131 | case CMD_DATA_SC: |
---|
6132 | p_vci.cmdval = true; |
---|
6133 | p_vci.address = r_dcache_vci_paddr.read() & ~0x3; |
---|
6134 | if (r_vci_cmd_cpt.read() == 0) p_vci.wdata = r_dcache_llsc_key.read(); |
---|
6135 | else p_vci.wdata = r_dcache_vci_sc_data.read(); |
---|
6136 | p_vci.be = 0xF; |
---|
6137 | p_vci.trdid = 0; |
---|
6138 | p_vci.pktid = TYPE_SC; |
---|
6139 | p_vci.plen = 8; |
---|
6140 | p_vci.cmd = vci_param::CMD_NOP; |
---|
6141 | p_vci.eop = (r_vci_cmd_cpt.read() == 1); |
---|
6142 | break; |
---|
6143 | |
---|
6144 | case CMD_DATA_CAS: |
---|
6145 | p_vci.cmdval = true; |
---|
6146 | p_vci.address = r_dcache_vci_paddr.read() & ~0x3; |
---|
6147 | if (r_vci_cmd_cpt.read() == 0) p_vci.wdata = r_dcache_vci_cas_old.read(); |
---|
6148 | else p_vci.wdata = r_dcache_vci_cas_new.read(); |
---|
6149 | p_vci.be = 0xF; |
---|
6150 | p_vci.trdid = 0; |
---|
6151 | p_vci.pktid = TYPE_CAS; |
---|
6152 | p_vci.plen = 8; |
---|
6153 | p_vci.cmd = vci_param::CMD_NOP; |
---|
6154 | p_vci.eop = (r_vci_cmd_cpt.read() == 1); |
---|
6155 | break; |
---|
6156 | } // end switch r_vci_cmd_fsm |
---|
6157 | |
---|
6158 | // VCI initiator response on the direct network |
---|
6159 | // it depends on the VCI_RSP FSM |
---|
6160 | |
---|
6161 | switch (r_vci_rsp_fsm.read()) |
---|
6162 | { |
---|
6163 | case RSP_DATA_WRITE : p_vci.rspack = true; break; |
---|
6164 | case RSP_INS_MISS : p_vci.rspack = r_vci_rsp_fifo_icache.wok(); break; |
---|
6165 | case RSP_INS_UNC : p_vci.rspack = r_vci_rsp_fifo_icache.wok(); break; |
---|
6166 | case RSP_DATA_MISS : p_vci.rspack = r_vci_rsp_fifo_dcache.wok(); break; |
---|
6167 | case RSP_DATA_UNC : p_vci.rspack = r_vci_rsp_fifo_dcache.wok(); break; |
---|
6168 | case RSP_DATA_LL : p_vci.rspack = r_vci_rsp_fifo_dcache.wok(); break; |
---|
6169 | case RSP_IDLE : p_vci.rspack = false; break; |
---|
6170 | } // end switch r_vci_rsp_fsm |
---|
6171 | |
---|
6172 | |
---|
6173 | // Send coherence packets on DSPIN P2M |
---|
6174 | // it depends on the CC_SEND FSM |
---|
6175 | |
---|
6176 | uint64_t dspin_send_data = 0; |
---|
6177 | switch (r_cc_send_fsm.read()) |
---|
6178 | { |
---|
6179 | ////////////////// |
---|
6180 | case CC_SEND_IDLE: |
---|
6181 | { |
---|
6182 | p_dspin_p2m.write = false; |
---|
6183 | break; |
---|
6184 | } |
---|
6185 | /////////////////////// |
---|
6186 | case CC_SEND_CLEANUP_1: |
---|
6187 | { |
---|
6188 | // initialize dspin send data |
---|
6189 | DspinDhccpParam::dspin_set(dspin |
---|