1 | /* caches-asm.S -- cache manipulation for OpenRISC 1000. |
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2 | * |
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3 | * Copyright (c) 2011, 2014 Authors |
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4 | * |
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5 | * Contributor Julius Baxter <juliusbaxter@gmail.com> |
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6 | * Contributor Stefan Wallentowitz <stefan.wallentowitz@tum.de> |
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7 | * |
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8 | * The authors hereby grant permission to use, copy, modify, distribute, |
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9 | * and license this software and its documentation for any purpose, provided |
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10 | * that existing copyright notices are retained in all copies and that this |
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11 | * notice is included verbatim in any distributions. No written agreement, |
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12 | * license, or royalty fee is required for any of the authorized uses. |
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13 | * Modifications to this software may be copyrighted by their authors |
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14 | * and need not follow the licensing terms described here, provided that |
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15 | * the new terms are clearly indicated on the first page of each file where |
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16 | * they apply. |
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17 | */ |
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18 | |
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19 | #include "include/or1k-asm.h" |
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20 | #include "include/or1k-sprs.h" |
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21 | |
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22 | /* -------------------------------------------------------------------------- */ |
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23 | /*!Function used at reset to clear and enable all caches |
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24 | */ |
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25 | /* -------------------------------------------------------------------------- */ |
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26 | .global _or1k_cache_init |
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27 | .type _or1k_cache_init,@function |
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28 | |
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29 | _or1k_cache_init: |
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30 | /* Instruction cache enable */ |
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31 | /* Check if IC present and skip enabling otherwise */ |
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32 | l.mfspr r3,r0,OR1K_SPR_SYS_UPR_ADDR |
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33 | l.andi r4,r3,OR1K_SPR_SYS_UPR_ICP_MASK |
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34 | l.sfeq r4,r0 |
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35 | OR1K_DELAYED_NOP(OR1K_INST(l.bf .Lnoic)) |
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36 | |
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37 | /* Disable IC */ |
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38 | l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR |
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39 | l.addi r5,r0,-1 |
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40 | l.xori r5,r5,OR1K_SPR_SYS_SR_ICE_MASK |
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41 | l.and r5,r6,r5 |
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42 | l.mtspr r0,r5,OR1K_SPR_SYS_SR_ADDR |
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43 | |
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44 | /* Establish cache block size |
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45 | If BS=0, 16; |
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46 | If BS=1, 32; |
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47 | r14 contain block size |
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48 | */ |
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49 | l.mfspr r3,r0,OR1K_SPR_SYS_ICCFGR_ADDR |
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50 | l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_CBS_MASK |
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51 | l.srli r7,r4,7 |
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52 | l.ori r8,r0,16 |
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53 | l.sll r14,r8,r7 |
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54 | |
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55 | /* Establish number of cache sets |
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56 | r13 contains number of cache sets |
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57 | r7 contains log(# of cache sets) |
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58 | */ |
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59 | l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_NCS_MASK |
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60 | l.srli r7,r4,3 |
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61 | l.ori r8,r0,1 |
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62 | l.sll r13,r8,r7 |
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63 | |
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64 | /* Invalidate IC */ |
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65 | l.addi r6,r0,0 |
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66 | l.sll r5,r14,r7 |
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67 | |
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68 | .Linvi: l.mtspr r0,r6,OR1K_SPR_ICACHE_ICBIR_ADDR |
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69 | l.sfne r6,r5 |
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70 | OR1K_DELAYED( |
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71 | OR1K_INST(l.add r6,r6,r14), |
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72 | OR1K_INST(l.bf .Linvi) |
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73 | ) |
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74 | |
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75 | /* Enable IC */ |
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76 | l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR |
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77 | l.ori r6,r6,OR1K_SPR_SYS_SR_ICE_MASK |
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78 | l.mtspr r0,r6,OR1K_SPR_SYS_SR_ADDR |
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79 | l.nop |
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80 | l.nop |
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81 | l.nop |
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82 | l.nop |
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83 | l.nop |
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84 | l.nop |
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85 | l.nop |
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86 | l.nop |
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87 | |
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88 | /* Data cache enable */ |
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89 | /* Check if DC present and skip enabling otherwise */ |
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90 | .Lnoic: l.mfspr r3,r0,OR1K_SPR_SYS_UPR_ADDR |
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91 | l.andi r4,r3,OR1K_SPR_SYS_UPR_DCP_MASK |
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92 | l.sfeq r4,r0 |
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93 | OR1K_DELAYED_NOP(OR1K_INST(l.bf .Lnodc)) |
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94 | /* Disable DC */ |
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95 | l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR |
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96 | l.addi r5,r0,-1 |
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97 | l.xori r5,r5,OR1K_SPR_SYS_SR_DCE_MASK |
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98 | l.and r5,r6,r5 |
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99 | l.mtspr r0,r5,OR1K_SPR_SYS_SR_ADDR |
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100 | /* Establish cache block size |
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101 | If BS=0, 16; |
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102 | If BS=1, 32; |
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103 | r14 contain block size */ |
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104 | l.mfspr r3,r0,OR1K_SPR_SYS_DCCFGR_ADDR |
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105 | l.andi r4,r3,OR1K_SPR_SYS_DCCFGR_CBS_MASK |
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106 | l.srli r7,r4,7 |
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107 | l.ori r8,r0,16 |
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108 | l.sll r14,r8,r7 |
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109 | /* Establish number of cache sets |
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110 | r13 contains number of cache sets |
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111 | r7 contains log(# of cache sets) */ |
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112 | l.andi r4,r3,OR1K_SPR_SYS_ICCFGR_NCS_MASK |
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113 | l.srli r7,r4,3 |
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114 | l.ori r8,r0,1 |
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115 | l.sll r13,r8,r7 |
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116 | /* Invalidate DC */ |
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117 | l.addi r6,r0,0 |
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118 | l.sll r5,r14,r7 |
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119 | |
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120 | .Linvd: l.mtspr r0,r6,OR1K_SPR_DCACHE_DCBIR_ADDR |
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121 | l.sfne r6,r5 |
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122 | OR1K_DELAYED( |
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123 | OR1K_INST(l.add r6,r6,r14), |
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124 | OR1K_INST(l.bf .Linvd) |
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125 | ) |
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126 | /* Enable DC */ |
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127 | l.mfspr r6,r0,OR1K_SPR_SYS_SR_ADDR |
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128 | l.ori r6,r6,OR1K_SPR_SYS_SR_DCE_MASK |
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129 | l.mtspr r0,r6,OR1K_SPR_SYS_SR_ADDR |
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130 | |
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131 | .Lnodc: |
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132 | /* Return */ |
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133 | OR1K_DELAYED_NOP(OR1K_INST(l.jr r9)) |
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134 | |
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135 | /* -------------------------------------------------------------------------- */ |
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136 | /*!Function to enable instruction cache |
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137 | */ |
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138 | /* -------------------------------------------------------------------------- */ |
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139 | |
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140 | .global or1k_icache_enable |
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141 | .type or1k_icache_enable,@function |
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142 | |
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143 | or1k_icache_enable: |
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144 | /* Enable IC */ |
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145 | l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR |
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146 | l.ori r13,r13,OR1K_SPR_SYS_SR_ICE_MASK |
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147 | l.mtspr r0,r13,OR1K_SPR_SYS_SR_ADDR |
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148 | l.nop |
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149 | l.nop |
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150 | l.nop |
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151 | l.nop |
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152 | l.nop |
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153 | OR1K_DELAYED_NOP(OR1K_INST(l.jr r9)) |
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154 | |
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155 | /* -------------------------------------------------------------------------- */ |
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156 | /*!Function to disable instruction cache |
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157 | */ |
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158 | /* -------------------------------------------------------------------------- */ |
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159 | .global or1k_icache_disable |
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160 | .type or1k_icache_disable,@function |
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161 | |
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162 | or1k_icache_disable: |
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163 | /* Disable IC */ |
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164 | l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR |
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165 | l.addi r12,r0,-1 |
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166 | l.xori r12,r12,OR1K_SPR_SYS_SR_ICE_MASK |
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167 | l.and r12,r13,r12 |
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168 | l.mtspr r0,r12,OR1K_SPR_SYS_SR_ADDR |
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169 | OR1K_DELAYED_NOP(OR1K_INST(l.jr r9)) |
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170 | |
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171 | /* -------------------------------------------------------------------------- */ |
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172 | /*!Function to flush address of instruction cache |
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173 | */ |
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174 | /* -------------------------------------------------------------------------- */ |
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175 | .global or1k_icache_flush |
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176 | .type or1k_icache_flush,@function |
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177 | |
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178 | or1k_icache_flush: |
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179 | OR1K_DELAYED( |
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180 | OR1K_INST(l.mtspr r0,r3,OR1K_SPR_ICACHE_ICBIR_ADDR), |
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181 | /* Push r3 into IC invalidate reg */ |
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182 | OR1K_INST(l.jr r9) |
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183 | ) |
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184 | |
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185 | |
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186 | /* -------------------------------------------------------------------------- */ |
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187 | /*!Function to enable data cache |
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188 | */ |
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189 | /* -------------------------------------------------------------------------- */ |
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190 | .global or1k_dcache_enable |
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191 | .type or1k_dcache_enable,@function |
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192 | |
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193 | or1k_dcache_enable: |
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194 | /* Enable DC */ |
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195 | l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR |
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196 | l.ori r13,r13,OR1K_SPR_SYS_SR_DCE_MASK |
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197 | l.mtspr r0,r13,OR1K_SPR_SYS_SR_ADDR |
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198 | l.nop |
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199 | l.nop |
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200 | l.nop |
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201 | l.nop |
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202 | l.nop |
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203 | OR1K_DELAYED_NOP(OR1K_INST(l.jr r9)) |
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204 | |
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205 | /* -------------------------------------------------------------------------- */ |
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206 | /*!Function to disable data cache |
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207 | */ |
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208 | /* -------------------------------------------------------------------------- */ |
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209 | .global or1k_dcache_disable |
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210 | .type or1k_dcache_disable,@function |
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211 | |
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212 | or1k_dcache_disable: |
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213 | /* Disable DC */ |
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214 | l.mfspr r13,r0,OR1K_SPR_SYS_SR_ADDR |
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215 | l.addi r12,r0,-1 |
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216 | l.xori r12,r12,OR1K_SPR_SYS_SR_DCE_MASK |
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217 | l.and r12,r13,r12 |
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218 | l.mtspr r0,r12,OR1K_SPR_SYS_SR_ADDR |
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219 | OR1K_DELAYED_NOP(OR1K_INST(l.jr r9)) |
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220 | |
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221 | /* -------------------------------------------------------------------------- */ |
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222 | /*!Function to flush address of data cache |
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223 | */ |
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224 | /* -------------------------------------------------------------------------- */ |
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225 | .global or1k_dcache_flush |
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226 | .type or1k_dcache_flush,@function |
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227 | |
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228 | or1k_dcache_flush: |
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229 | OR1K_DELAYED( |
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230 | OR1K_INST(l.mtspr r0,r3,OR1K_SPR_DCACHE_DCBIR_ADDR), |
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231 | /* Push r3 into DC invalidate reg */ |
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232 | OR1K_INST(l.jr r9) |
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233 | ) |
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