1 | /* |
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2 | * hal_special.c - implementation of Generic Special Register Access API for TSAR-MIPS32 |
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3 | * |
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4 | * Author Alain Greiner (2016,2017) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH.. |
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9 | * |
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10 | * ALMOS-MKH. is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH. 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 | * 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 General Public License |
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20 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | |
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25 | #include <hal_types.h> |
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26 | #include <hal_special.h> |
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27 | #include <core.h> |
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28 | #include <thread.h> |
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29 | |
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30 | /**** Forward declarations ****/ |
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31 | |
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32 | struct thread_s; |
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33 | |
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34 | |
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35 | ////////////////////////// |
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36 | inline gid_t hal_get_gid() |
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37 | { |
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38 | uint32_t proc_id; |
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39 | |
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40 | asm volatile ("mfc0 %0, $15, 1" : "=&r" (proc_id)); |
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41 | |
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42 | return (proc_id & 0x3FF); // 4/4/2 format for TSAR |
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43 | } |
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44 | |
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45 | //////////////////////////////// |
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46 | inline cycle_t hal_time_stamp() |
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47 | { |
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48 | cycle_t count; |
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49 | |
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50 | asm volatile ("mfc0 %0, $9 " : "=&r" (count)); |
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51 | |
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52 | return count; |
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53 | } |
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54 | |
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55 | ///////////////////////// |
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56 | uint64_t hal_get_cycles() |
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57 | { |
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58 | uint64_t cycles; // absolute time to be returned |
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59 | uint32_t last_count; // last registered cycles count |
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60 | uint32_t current_count; // current cycles count |
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61 | uint32_t elapsed; |
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62 | |
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63 | core_t * core = CURRENT_THREAD->core; |
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64 | |
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65 | // get last registered time stamp |
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66 | last_count = core->time_stamp; |
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67 | |
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68 | // get current time stamp from hardware register |
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69 | current_count = hal_time_stamp(); |
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70 | |
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71 | // compute number of elapsed cycles, taking into account 32 bits register wrap |
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72 | if(current_count < last_count) elapsed = (0xFFFFFFFF - last_count) + current_count; |
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73 | else elapsed = current_count - last_count; |
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74 | |
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75 | // compute absolute time |
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76 | cycles = core->cycles + elapsed; |
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77 | |
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78 | // update core time |
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79 | core->time_stamp = current_count; |
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80 | core->cycles = cycles; |
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81 | |
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82 | hal_wbflush(); |
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83 | |
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84 | return cycles; |
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85 | } |
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86 | |
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87 | ///////////////////////////////////////////////// |
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88 | inline struct thread_s * hal_get_current_thread() |
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89 | { |
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90 | void * thread_ptr; |
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91 | |
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92 | asm volatile |
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93 | ( "mfc0 %0, $4, 2 \n" |
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94 | : "=&r" (thread_ptr) ); |
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95 | |
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96 | return thread_ptr; |
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97 | } |
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98 | |
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99 | /////////////////////////////////////////////////////// |
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100 | void hal_set_current_thread( struct thread_s * thread ) |
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101 | { |
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102 | asm volatile |
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103 | ( "mtc0 %0, $4, 2 \n" |
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104 | : : "r" (thread) ); |
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105 | } |
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106 | |
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107 | ///////////////////// |
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108 | void hal_fpu_enable() |
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109 | { |
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110 | asm volatile |
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111 | ( ".set noat \n" |
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112 | "lui $27, 0x2000 \n" |
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113 | "mfc0 $1, $12 \n" |
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114 | "or $27, $1, $27 \n" |
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115 | "mtc0 $27, $12 \n" |
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116 | ".set at \n" ); |
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117 | } |
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118 | |
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119 | ////////////////////// |
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120 | void hal_fpu_disable() |
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121 | { |
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122 | asm volatile |
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123 | ( ".set noat \n" |
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124 | "lui $27, 0xDFFF \n" |
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125 | "ori $27, $27, 0xFFFF \n" |
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126 | "mfc0 $1, $12 \n" |
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127 | "and $27, $1, $27 \n" |
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128 | "mtc0 $27, $12 \n" |
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129 | ".set at \n"); |
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130 | } |
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131 | |
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132 | //////////////////////// |
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133 | uint32_t hal_get_stack() |
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134 | { |
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135 | register uint32_t sp; |
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136 | |
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137 | asm volatile |
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138 | ( "or %0, $0, $29 \n" |
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139 | : "=&r" (sp) ); |
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140 | |
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141 | return sp; |
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142 | } |
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143 | |
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144 | //////////////////////////////////////// |
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145 | uint32_t hal_set_stack( void * new_val ) |
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146 | { |
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147 | register uint32_t sp; |
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148 | |
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149 | asm volatile |
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150 | ( "or %0, $0, $29 \n" |
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151 | "or $29, $0, %1 \n" |
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152 | : "=&r" (sp) : "r" (new_val) ); |
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153 | |
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154 | return sp; |
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155 | } |
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156 | |
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157 | //////////////////////////// |
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158 | uint32_t hal_get_bad_vaddr() |
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159 | { |
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160 | register uint32_t bad_va; |
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161 | |
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162 | asm volatile |
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163 | ( "mfc0 %0, $8 \n" |
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164 | : "=&r" (bad_va) ); |
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165 | |
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166 | return bad_va; |
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167 | } |
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168 | |
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169 | //////////////////////////////////////////// |
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170 | uint32_t hal_uncached_read( uint32_t * ptr ) |
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171 | { |
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172 | register uint32_t val; |
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173 | |
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174 | asm volatile |
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175 | ( "ll %0, (%1) \n" |
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176 | : "=&r"(val) : "r" (ptr) ); |
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177 | |
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178 | return val; |
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179 | } |
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180 | |
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181 | ////////////////////////////////////////// |
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182 | void hal_invalid_dcache_line( void * ptr ) |
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183 | { |
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184 | asm volatile |
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185 | ( "cache %0, (%1) \n" |
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186 | "sync \n" |
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187 | : : "i" (0x11) , "r" (ptr) ); |
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188 | } |
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189 | |
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190 | ////////////////// |
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191 | void hal_wbflush() |
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192 | { |
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193 | asm volatile |
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194 | ( "sync \n":: ); |
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195 | } |
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196 | |
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197 | //////////////// |
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198 | void hal_rdbar() |
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199 | { |
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200 | asm volatile( "" ::: "memory" ); |
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201 | } |
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202 | |
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203 | ///////////////////// |
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204 | void hal_core_sleep() |
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205 | { |
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206 | asm volatile |
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207 | ("wait \n"::); |
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208 | } |
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209 | |
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210 | ////////////////////////////////////// |
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211 | void hal_fixed_delay( uint32_t delay ) |
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212 | { |
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213 | asm volatile |
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214 | ( "1: \n" |
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215 | "or $27, %0, $0 \n" |
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216 | "addi $27, $27, -1 \n" |
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217 | "bne $27, $0, 1b \n" |
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218 | "nop \n" |
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219 | : : "r" (delay) : "$27" ); |
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220 | } |
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221 | |
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222 | ////////////////////////////////////////////////// |
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223 | void hal_get_mmu_excp( intptr_t * mmu_ins_excp_code, |
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224 | intptr_t * mmu_ins_bad_vaddr, |
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225 | intptr_t * mmu_dat_excp_code, |
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226 | intptr_t * mmu_dat_bad_vaddr ) |
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227 | { |
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228 | asm volatile |
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229 | ( "mfc2 %0, $11 \n" |
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230 | "mfc2 %1, $13 \n" |
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231 | "mfc2 %2, $12 \n" |
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232 | "mfc2 %3, $14 \n" |
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233 | : "=&r"(mmu_ins_excp_code), |
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234 | "=&r"(mmu_ins_bad_vaddr), |
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235 | "=&r"(mmu_dat_excp_code), |
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236 | "=&r"(mmu_dat_bad_vaddr) ); |
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237 | } |
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