1 | /* |
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2 | * Copyright (c) 2014-2015 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/score/cpuopts.h> |
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20 | #include <rtems/score/isrlevel.h> |
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21 | |
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22 | /* |
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23 | * This file is a dirty hack. A proper solution would be to add RTEMS support |
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24 | * for libatomic in GCC (see also libatomic/configure.tgt). |
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25 | */ |
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26 | |
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27 | #if defined(RTEMS_SMP) |
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28 | static volatile uint32_t _SPARCV8_The_one_lock; |
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29 | |
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30 | static inline uint32_t _SPARCV8_Atomic_swap( |
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31 | volatile uint32_t *address, |
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32 | uint32_t value |
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33 | ) |
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34 | { |
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35 | asm volatile ( |
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36 | "swap [%2], %0" |
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37 | : "=r" (value) |
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38 | : "0" (value), "r" (address) |
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39 | : "memory" |
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40 | ); |
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41 | |
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42 | return value; |
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43 | } |
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44 | #endif |
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45 | |
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46 | static ISR_Level _SPARCV8_Acquire_the_one_lock( void ) |
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47 | { |
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48 | ISR_Level level; |
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49 | |
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50 | _ISR_Disable_without_giant( level ); |
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51 | |
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52 | #if defined(RTEMS_SMP) |
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53 | do { |
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54 | while ( _SPARCV8_The_one_lock ) { |
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55 | /* Wait */ |
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56 | } |
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57 | } while ( _SPARCV8_Atomic_swap( &_SPARCV8_The_one_lock, 1 ) ); |
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58 | #endif |
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59 | |
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60 | return level; |
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61 | } |
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62 | |
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63 | static void _SPARCV8_Release_the_one_lock( ISR_Level level ) |
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64 | { |
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65 | #if defined(RTEMS_SMP) |
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66 | _SPARCV8_The_one_lock = 0; |
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67 | #endif |
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68 | _ISR_Enable_without_giant( level ); |
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69 | } |
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70 | |
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71 | uint8_t __atomic_exchange_1( uint8_t *mem, uint8_t val, int model ) |
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72 | { |
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73 | uint8_t prev; |
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74 | ISR_Level level; |
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75 | |
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76 | level = _SPARCV8_Acquire_the_one_lock(); |
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77 | |
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78 | prev = *mem; |
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79 | *mem = val; |
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80 | |
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81 | _SPARCV8_Release_the_one_lock( level ); |
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82 | |
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83 | return prev; |
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84 | } |
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85 | |
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86 | /* |
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87 | * In order to get rid of the warning "conflicting types for built-in function |
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88 | * '__atomic_compare_exchange_4' [enabled by default]", you must port libatomic |
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89 | * to SPARC/RTEMS. The libatomic is provided by GCC. |
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90 | */ |
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91 | uint32_t __atomic_exchange_4( uint32_t *mem, uint32_t val, int model ) |
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92 | { |
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93 | uint32_t prev; |
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94 | ISR_Level level; |
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95 | |
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96 | level = _SPARCV8_Acquire_the_one_lock(); |
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97 | |
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98 | prev = *mem; |
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99 | *mem = val; |
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100 | |
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101 | _SPARCV8_Release_the_one_lock( level ); |
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102 | |
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103 | return prev; |
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104 | } |
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105 | |
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106 | /* |
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107 | * You get probably a warning here which can be ignored: "warning: conflicting |
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108 | * types for built-in function '__atomic_compare_exchange_4' [enabled by |
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109 | * default]" |
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110 | */ |
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111 | bool __atomic_compare_exchange_4( |
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112 | uint32_t *mem, |
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113 | uint32_t *expected, |
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114 | uint32_t desired, |
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115 | int success, |
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116 | int failure |
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117 | ) |
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118 | { |
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119 | bool equal; |
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120 | ISR_Level level; |
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121 | uint32_t actual; |
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122 | |
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123 | level = _SPARCV8_Acquire_the_one_lock(); |
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124 | |
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125 | actual = *mem; |
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126 | equal = ( actual == *expected ); |
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127 | if ( equal ) { |
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128 | *mem = desired; |
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129 | } else { |
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130 | *expected = actual; |
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131 | } |
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132 | |
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133 | _SPARCV8_Release_the_one_lock( level ); |
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134 | |
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135 | return equal; |
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136 | } |
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137 | |
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138 | uint32_t __atomic_fetch_add_4( uint32_t *mem, uint32_t val, int model ) |
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139 | { |
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140 | uint32_t prev; |
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141 | ISR_Level level; |
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142 | |
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143 | level = _SPARCV8_Acquire_the_one_lock(); |
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144 | |
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145 | prev = *mem; |
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146 | *mem = prev + val; |
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147 | |
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148 | _SPARCV8_Release_the_one_lock( level ); |
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149 | |
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150 | return prev; |
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151 | } |
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152 | |
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153 | uint32_t __atomic_fetch_sub_4( uint32_t *mem, uint32_t val, int model ) |
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154 | { |
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155 | uint32_t prev; |
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156 | ISR_Level level; |
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157 | |
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158 | level = _SPARCV8_Acquire_the_one_lock(); |
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159 | |
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160 | prev = *mem; |
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161 | *mem = prev - val; |
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162 | |
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163 | _SPARCV8_Release_the_one_lock( level ); |
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164 | |
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165 | return prev; |
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166 | } |
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167 | |
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168 | uint32_t __atomic_fetch_and_4( uint32_t *mem, uint32_t val, int model ) |
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169 | { |
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170 | uint32_t prev; |
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171 | ISR_Level level; |
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172 | |
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173 | level = _SPARCV8_Acquire_the_one_lock(); |
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174 | |
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175 | prev = *mem; |
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176 | *mem = prev & val; |
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177 | |
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178 | _SPARCV8_Release_the_one_lock( level ); |
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179 | |
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180 | return prev; |
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181 | } |
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182 | |
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183 | uint32_t __atomic_fetch_or_4( uint32_t *mem, uint32_t val, int model ) |
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184 | { |
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185 | uint32_t prev; |
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186 | ISR_Level level; |
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187 | |
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188 | level = _SPARCV8_Acquire_the_one_lock(); |
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189 | |
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190 | prev = *mem; |
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191 | *mem = prev | val; |
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192 | |
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193 | _SPARCV8_Release_the_one_lock( level ); |
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194 | |
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195 | return prev; |
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196 | } |
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197 | |
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198 | uint32_t __atomic_fetch_xor_4( uint32_t *mem, uint32_t val, int model ) |
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199 | { |
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200 | uint32_t prev; |
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201 | ISR_Level level; |
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202 | |
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203 | level = _SPARCV8_Acquire_the_one_lock(); |
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204 | |
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205 | prev = *mem; |
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206 | *mem = prev ^ val; |
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207 | |
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208 | _SPARCV8_Release_the_one_lock( level ); |
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209 | |
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210 | return prev; |
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211 | } |
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