annotate packages/hal/mips/arch/current/include/hal_cache.h @ 6:d376b777e2ce ecos-sw-1999-05-14

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1 #ifndef CYGONCE_HAL_CACHE_H
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2 #define CYGONCE_HAL_CACHE_H
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3
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4 //=============================================================================
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5 //
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6 // hal_cache.h
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7 //
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8 // HAL cache control API
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9 //
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10 //=============================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Cygnus eCos Public License
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15 // Version 1.0 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://sourceware.cygnus.com/ecos
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Cygnus Operating System, released
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25 // September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Cygnus. Portions created
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
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29 // -------------------------------------------
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30 //
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31 //####COPYRIGHTEND####
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32 //=============================================================================
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33 //#####DESCRIPTIONBEGIN####
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34 //
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35 // Author(s): nickg
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36 // Contributors: nickg
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37 // Date: 1998-02-17
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38 // Purpose: Cache control API
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39 // Description: The macros defined here provide the HAL APIs for handling
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40 // cache control operations.
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41 // Usage:
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42 // #include <cyg/hal/hal_cache.h>
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43 // ...
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44 //
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45 //
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46 //####DESCRIPTIONEND####
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47 //
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48 //=============================================================================
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49
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50 #include <pkgconf/hal.h>
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51 #include <cyg/infra/cyg_type.h>
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52
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53 #include <cyg/hal/var_cache.h>
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54
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55 //=============================================================================
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56 // Default Implementation. This uses the standard MIPS CP0 registers and
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57 // cache instructions. Note that not all variants will have all of the
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58 // functionality defined here.
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59
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60 //-----------------------------------------------------------------------------
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61 // Cache dimensions.
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62 // These really should be defined in var_cache.h. If they are not, then provide
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63 // a set of numbers that are typical of many variants.
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64
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65 #ifndef HAL_DCACHE_SIZE
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66
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67 // Data cache
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68 #define HAL_DCACHE_SIZE 4096 // Size of data cache in bytes
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69 #define HAL_DCACHE_LINE_SIZE 16 // Size of a data cache line
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70 #define HAL_DCACHE_WAYS 2 // Associativity of the cache
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71
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72 // Instruction cache
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73 #define HAL_ICACHE_SIZE 4096 // Size of cache in bytes
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74 #define HAL_ICACHE_LINE_SIZE 16 // Size of a cache line
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75 #define HAL_ICACHE_WAYS 2 // Associativity of the cache
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76
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77 #define HAL_DCACHE_SETS (HAL_DCACHE_SIZE/(HAL_DCACHE_LINE_SIZE*HAL_DCACHE_WAYS))
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78 #define HAL_ICACHE_SETS (HAL_ICACHE_SIZE/(HAL_ICACHE_LINE_SIZE*HAL_ICACHE_WAYS))
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79
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80 #endif
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81
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82 //-----------------------------------------------------------------------------
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83 // Global control of data cache
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84
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85 // Enable the data cache
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86 // There is no default mechanism for enabling or disabling the caches.
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87 #ifndef HAL_DCACHE_ENABLE_DEFINED
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88 #define HAL_DCACHE_ENABLE()
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89 #endif
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90
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91 // Disable the data cache
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92 #ifndef HAL_DCACHE_DISABLE_DEFINED
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93 #define HAL_DCACHE_DISABLE()
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94 #endif
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95
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96 // Invalidate the entire cache
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97 // We simply use HAL_DCACHE_SYNC() to do this. For writeback caches this
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98 // is not quite what we want, but there is no index-invalidate operation
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99 // available.
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100 #ifndef HAL_DCACHE_INVALIDATE_ALL_DEFINED
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101 #define HAL_DCACHE_INVALIDATE_ALL() HAL_DCACHE_SYNC()
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102 #endif
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103
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104 // Synchronize the contents of the cache with memory.
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105 // This uses the index-writeback-invalidate operation.
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106 #ifndef HAL_DCACHE_SYNC_DEFINED
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107 #define HAL_DCACHE_SYNC() \
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108 { \
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109 register CYG_ADDRESS _baddr_ = 0x80000000; \
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110 register CYG_ADDRESS _addr_ = 0x80000000; \
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111 register CYG_WORD _size_ = HAL_DCACHE_SIZE; \
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112 HAL_DCACHE_DISABLE(); \
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113 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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114 { \
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115 asm volatile ("cache 0x01,0(%0)" : : "r"(_addr_) ); \
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116 } \
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117 HAL_DCACHE_ENABLE(); \
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118 }
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119 #endif
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120
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121 // Set the data cache refill burst size
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122 //#define HAL_DCACHE_BURST_SIZE(_size_)
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123
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124 // Set the data cache write mode
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125 //#define HAL_DCACHE_WRITE_MODE( _mode_ )
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126
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127 //#define HAL_DCACHE_WRITETHRU_MODE 0
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128 //#define HAL_DCACHE_WRITEBACK_MODE 1
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129
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130 // Load the contents of the given address range into the data cache
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131 // and then lock the cache so that it stays there.
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132 // This uses the fetch-and-lock cache operation.
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133 #ifndef HAL_DCACHE_LOCK_DEFINED
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134 #define HAL_DCACHE_LOCK(_base_, _asize_) \
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135 CYG_MACRO_START \
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136 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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137 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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138 register CYG_WORD _size_ = (_asize_); \
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139 HAL_DCACHE_DISABLE(); \
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140 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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141 { \
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142 asm volatile ("cache 0x1d,0(%0)" : : "r"(_addr_) ); \
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143 } \
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144 HAL_DCACHE_ENABLE(); \
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145 CYG_MACRO_END
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146 #endif
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147
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148 // Undo a previous lock operation.
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149 // Do this by flushing the cache, which is defined to clear the lock bit.
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150 #ifndef HAL_DCACHE_UNLOCK_DEFINED
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151 #define HAL_DCACHE_UNLOCK(_base_, _size_) \
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152 HAL_DCACHE_FLUSH( _base_, _size_ )
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153 #endif
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154
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155 // Unlock entire cache
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156 #ifndef HAL_DCACHE_UNLOCK_ALL_DEFINED
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157 #define HAL_DCACHE_UNLOCK_ALL() \
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158 HAL_DCACHE_INVALIDATE_ALL()
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159 #endif
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160
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161 //-----------------------------------------------------------------------------
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162 // Data cache line control
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163
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164 // Allocate cache lines for the given address range without reading its
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165 // contents from memory.
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166 //#define HAL_DCACHE_ALLOCATE( _base_ , _size_ )
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167
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168 // Write dirty cache lines to memory and invalidate the cache entries
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169 // for the given address range.
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170 // This uses the hit-writeback-invalidate cache operation.
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171 #ifndef HAL_DCACHE_FLUSH_DEFINED
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172 #define HAL_DCACHE_FLUSH( _base_ , _asize_ ) \
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173 { \
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174 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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175 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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176 register CYG_WORD _size_ = (_asize_); \
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177 HAL_DCACHE_DISABLE(); \
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178 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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179 { \
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180 asm volatile ("cache 0x15,0(%0)" : : "r"(_addr_) ); \
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181 } \
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182 HAL_DCACHE_ENABLE(); \
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183 }
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184 #endif
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185
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186 // Invalidate cache lines in the given range without writing to memory.
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187 // This uses the hit-invalidate cache operation.
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188 #ifndef HAL_DCACHE_INVALIDATE_DEFINED
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189 #define HAL_DCACHE_INVALIDATE( _base_ , _asize_ ) \
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190 { \
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191 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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192 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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193 register CYG_WORD _size_ = (_asize_); \
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194 HAL_DCACHE_DISABLE(); \
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195 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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196 { \
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197 asm volatile ("cache 0x11,0(%0)" : : "r"(_addr_) ); \
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198 } \
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199 HAL_DCACHE_ENABLE(); \
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200 }
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201 #endif
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202
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203 // Write dirty cache lines to memory for the given address range.
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204 // This uses the hit-writeback cache operation.
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205 #ifndef HAL_DCACHE_STORE_DEFINED
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206 #define HAL_DCACHE_STORE( _base_ , _asize_ ) \
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207 { \
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208 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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209 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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210 register CYG_WORD _size_ = (_asize_); \
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211 HAL_DCACHE_DISABLE(); \
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212 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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213 { \
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214 asm volatile ("cache 0x19,0(%0)" : : "r"(_addr_) ); \
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215 } \
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216 HAL_DCACHE_ENABLE(); \
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217 }
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218 #endif
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219
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220 // Preread the given range into the cache with the intention of reading
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221 // from it later.
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222 //#define HAL_DCACHE_READ_HINT( _base_ , _size_ )
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223
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224 // Preread the given range into the cache with the intention of writing
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225 // to it later.
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226 //#define HAL_DCACHE_WRITE_HINT( _base_ , _size_ )
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227
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228 // Allocate and zero the cache lines associated with the given range.
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229 //#define HAL_DCACHE_ZERO( _base_ , _size_ )
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230
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231 //-----------------------------------------------------------------------------
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232 // Global control of Instruction cache
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233
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234 // Enable the instruction cache
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235 // There is no default mechanism for enabling or disabling the caches.
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236 #ifndef HAL_ICACHE_ENABLE_DEFINED
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237 #define HAL_ICACHE_ENABLE()
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238 #endif
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239
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240 // Disable the instruction cache
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241 #ifndef HAL_ICACHE_DISABLE_DEFINED
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242 #define HAL_ICACHE_DISABLE()
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243 #endif
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244
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245 // Invalidate the entire cache
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246 // This uses the index-invalidate cache operation.
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247 #ifndef HAL_ICACHE_INVALIDATE_ALL_DEFINED
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248 #define HAL_ICACHE_INVALIDATE_ALL() \
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249 { \
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250 register CYG_ADDRESS _baddr_ = 0x80000000; \
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251 register CYG_ADDRESS _addr_ = 0x80000000; \
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252 HAL_ICACHE_DISABLE(); \
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253 for( ; _addr_ < _baddr_+HAL_ICACHE_SIZE; _addr_ += HAL_ICACHE_LINE_SIZE ) \
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254 { \
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255 asm volatile ("cache 0x00,0(%0)" : : "r"(_addr_) ); \
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256 } \
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257 HAL_ICACHE_ENABLE(); \
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258 }
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259 #endif
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260
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261 // Synchronize the contents of the cache with memory.
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262 // Simply force the cache to reload.
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263 #ifndef HAL_ICACHE_SYNC_DEFINED
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264 #define HAL_ICACHE_SYNC() HAL_ICACHE_INVALIDATE_ALL()
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265 #endif
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266
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267 // Set the instruction cache refill burst size
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268 //#define HAL_ICACHE_BURST_SIZE(_size_)
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269
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270 // Load the contents of the given address range into the instruction cache
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271 // and then lock the cache so that it stays there.
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272 // This uses the fetch-and-lock cache operation.
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273 #ifndef HAL_ICACHE_LOCK_DEFINED
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274 #define HAL_ICACHE_LOCK(_base_, _asize_) \
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275 CYG_MACRO_START \
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276 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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277 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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278 register CYG_WORD _size_ = (_asize_); \
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279 HAL_DCACHE_DISABLE(); \
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280 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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281 { \
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282 asm volatile ("cache 0x1c,0(%0)" : : "r"(_addr_) ); \
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283 } \
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284 HAL_DCACHE_ENABLE(); \
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285 CYG_MACRO_END
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286 #endif
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287
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288 // Undo a previous lock operation.
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289 // Do this by invalidating the cache, which is defined to clear the lock bit.
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290 #ifndef HAL_ICACHE_UNLOCK_DEFINED
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291 #define HAL_ICACHE_UNLOCK(_base_, _size_) \
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292 HAL_ICACHE_INVALIDATE( _base_, _size_ )
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293 #endif
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294
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295 // Unlock entire cache
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296 //#define HAL_ICACHE_UNLOCK_ALL()
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297
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298 //-----------------------------------------------------------------------------
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299 // Instruction cache line control
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300
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301 // Invalidate cache lines in the given range without writing to memory.
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302 // This uses the hit-invalidate cache operation.
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303 #ifndef HAL_ICACHE_INVALIDATE_DEFINED
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304 #define HAL_ICACHE_INVALIDATE( _base_ , _asize_ ) \
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305 { \
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306 register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_); \
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307 register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_); \
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308 register CYG_WORD _size_ = (_asize_); \
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309 HAL_DCACHE_DISABLE(); \
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310 for( ; _addr_ <= _baddr_+_size_; _addr_ += HAL_DCACHE_LINE_SIZE ) \
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311 { \
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312 asm volatile ("cache 0x10,0(%0)" : : "r"(_addr_) ); \
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313 } \
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314 HAL_DCACHE_ENABLE(); \
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315 }
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316 #endif
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317
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318 //-----------------------------------------------------------------------------
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319 // Check that a supported configuration has actually defined some macros.
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320
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321 #ifndef HAL_DCACHE_ENABLE
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322
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323 #error Unsupported MIPS configuration
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324
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325 #endif
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326
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327 //-----------------------------------------------------------------------------
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328 #endif // ifndef CYGONCE_HAL_CACHE_H
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329 // End of hal_cache.h