1 | /* |
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2 | * hal-cpu.h - CPU related Hardware Abstraction Layer |
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3 | * |
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4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012) |
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5 | * Alain Greiner (2016) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | #ifndef _HAL_CPU_H_ |
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26 | #define _HAL_CPU_H_ |
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27 | |
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28 | #include <types.h> |
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29 | #include <context.h> |
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30 | |
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31 | /***************************************************************************************** |
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32 | * All CPU specific implementations must define the functions and macros |
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33 | * specified in this CPU Hardware Abstraction Layer. |
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34 | ****************************************************************************************/ |
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35 | |
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36 | #define CPU_USR_MODE // CPU in user mode with interrupts enabled |
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37 | #define CPU_SYS_MODE // CPU in kernel mode with interrupts disabled |
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38 | |
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39 | |
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40 | ////////////////////////////////////////////////////////////////////////////////////////// |
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41 | ////////////////////////////////////////////////////////////////////////////////////////// |
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42 | // CPU context operations / implementation in the cpu/***/hal_context. |
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43 | ////////////////////////////////////////////////////////////////////////////////////////// |
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44 | ////////////////////////////////////////////////////////////////////////////////////////// |
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45 | |
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46 | /***************************************************************************************** |
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47 | * This function initializes a CPU execution context from informations contained |
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48 | * in a thread descriptor |
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49 | * @ ctx : pointer on the hal_context_t structure. |
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50 | * @ thread : pointer on the thread descriptor. |
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51 | ****************************************************************************************/ |
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52 | extern void hal_context_init( cpu_context_t * ctx, |
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53 | thread_t * thread ); |
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54 | |
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55 | /***************************************************************************************** |
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56 | * This function sets a new value in the thread slot of the calling CPU context. |
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57 | * @ ctx : pointer on the hal_context_t structure. |
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58 | * @ thread : pointer on the thread. |
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59 | ****************************************************************************************/ |
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60 | extern void hal_context_set_thread( cpu_context_t * ctx, |
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61 | thread_t * thread ); |
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62 | |
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63 | /***************************************************************************************** |
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64 | * This function sets a new value in the cp2_ptpr slot of the calling CPU context. |
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65 | * @ ctx : pointer on the hal_context_t structure. |
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66 | * @ ppm : pointer on the (source) physical memory manager. |
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67 | ****************************************************************************************/ |
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68 | extern void hal_context_set_pmm( cpu_context_t * ctx, |
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69 | pmm_t * pmm ); |
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70 | |
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71 | /***************************************************************************************** |
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72 | * This function sets a new value in the sigreturn_func slot of the calling CPU context. |
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73 | * @ ctx : pointer on the hal_context_t structure. |
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74 | * @ func : function pointer. |
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75 | ****************************************************************************************/ |
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76 | extern void hal_context_set_sigreturn( cpu_context_t * ctx, |
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77 | void * func ); |
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78 | |
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79 | /***************************************************************************************** |
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80 | * This function should be used to launch a new thread. |
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81 | * It loads the calling CPU registers from the values contained in the context argument, |
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82 | * and jumps to the address defined in the entry_func slot, using an eret. |
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83 | * @ ctx : pointer on the hal_context_t structure. |
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84 | ****************************************************************************************/ |
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85 | extern void hal_context_load( cpu_context_t * ctx); |
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86 | |
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87 | /***************************************************************************************** |
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88 | * This function saves the calling CPU registers to the CPU context argument. |
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89 | * @ ctx : pointer on the hal_context_t structure. |
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90 | ****************************************************************************************/ |
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91 | extern void hal_context_save( cpu_context_t * ctx ); |
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92 | |
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93 | /***************************************************************************************** |
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94 | * This function restores the CPU registers from the CPU context argument. |
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95 | * @ ctx : pointer on the hal_context_t structure. |
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96 | ****************************************************************************************/ |
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97 | extern void hal_context_restore( cpu_context_t * ctx, |
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98 | uint32_t val ); |
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99 | |
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100 | /***************************************************************************************** |
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101 | * This function initializes an uzone structure. |
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102 | * @ uzone : pointer on the structure to initialise. |
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103 | ****************************************************************************************/ |
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104 | extern void hal_uzone_init( cpu_uzone_t * uzone ); |
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105 | |
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106 | /***************************************************************************************** |
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107 | * This function copies the content of a source uzone to a destination uzone. |
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108 | * @ dst : pointer on the destination structure. |
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109 | * @ src : pointer on the source structure. |
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110 | ****************************************************************************************/ |
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111 | extern void hal_uzone_dup( cpu_uzone_t * dst, |
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112 | hal_uzone_t * src ); |
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113 | |
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114 | /***************************************************************************************** |
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115 | * This function save the fpu registers in the thread uzone. |
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116 | ****************************************************************************************/ |
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117 | extern void hal_fpu_context_save( cpu_uzone_t * uzone ); |
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118 | |
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119 | /***************************************************************************************** |
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120 | * This function restore the fpu registers from the thread uzone. |
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121 | ****************************************************************************************/ |
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122 | extern void hal_fpu_context_restore( cpu_uzone_t * uzone ); |
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123 | |
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124 | /***************************************************************************************** |
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125 | * This function TODO ??? [AG] |
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126 | ****************************************************************************************/ |
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127 | extern error_t hal_uzone_getattr( cpu_uzone_t * uzone, |
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128 | hal_uzone_attr_t * attr); |
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129 | |
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130 | /***************************************************************************************** |
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131 | * This function TODO ??? [AG] |
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132 | ****************************************************************************************/ |
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133 | extern error_t hal_uzone_setattr( cpu_uzone_t * uzone, |
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134 | hal_uzone_attr_t * attr); |
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135 | |
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136 | /***************************************************************************************** |
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137 | * This function TODO ??? [AG] |
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138 | ****************************************************************************************/ |
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139 | extern void hal_signal_notify( thread_t * this, |
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140 | void * handler, |
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141 | uint32_t sig ); |
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142 | |
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143 | //////////////////////////////////////////////////////////////////////////////////////////// |
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144 | //////////////////////////////////////////////////////////////////////////////////////////// |
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145 | // CPU special registers access / implementation in cpu/***/special.c |
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146 | //////////////////////////////////////////////////////////////////////////////////////////// |
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147 | //////////////////////////////////////////////////////////////////////////////////////////// |
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148 | |
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149 | /***************************************************************************************** |
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150 | * This function returns the global core identifier from the calling core register. |
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151 | ****************************************************************************************/ |
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152 | extern inline gid_t hal_get_gid(); |
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153 | |
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154 | /***************************************************************************************** |
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155 | * This function returns the content of the calling core cycles counter register. |
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156 | ****************************************************************************************/ |
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157 | extern inline uint32_t hal_time_stamp(); |
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158 | |
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159 | /***************************************************************************************** |
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160 | * This function returns the current thread pointer from the calling core register. |
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161 | ****************************************************************************************/ |
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162 | extern inline thread_t * hal_get_current_thread(); |
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163 | |
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164 | /***************************************************************************************** |
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165 | * This function registers a thread pointer in the calling CPU register. |
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166 | ****************************************************************************************/ |
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167 | extern inline void hal_set_current_thread(thread_t * thread); |
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168 | |
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169 | /***************************************************************************************** |
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170 | * This function writes into the proper CPU register to enable the floating point unit. |
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171 | ****************************************************************************************/ |
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172 | extern inline void hal_fpu_enable(); |
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173 | |
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174 | /***************************************************************************************** |
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175 | * This function writes into the proper CPU register to disable the floating point unit. |
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176 | ****************************************************************************************/ |
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177 | extern inline void hal_fpu_disable(); |
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178 | |
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179 | /***************************************************************************************** |
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180 | * This function returns the current value of stack pointer from CPU register. |
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181 | ****************************************************************************************/ |
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182 | extern inline uint32_t hal_get_stack(); |
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183 | |
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184 | /***************************************************************************************** |
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185 | * This function registers a new value in the CPU stack pointer and returns previous one. |
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186 | ****************************************************************************************/ |
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187 | extern inline uint32_t hal_set_stack( void * new_val ); |
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188 | |
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189 | |
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190 | ////////////////////////////////////////////////////////////////////////////////////////// |
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191 | ////////////////////////////////////////////////////////////////////////////////////////// |
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192 | // IRQ disable / restore operations / implementation in cpu/***/irqmask.c |
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193 | ////////////////////////////////////////////////////////////////////////////////////////// |
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194 | ////////////////////////////////////////////////////////////////////////////////////////// |
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195 | |
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196 | /***************************************************************************************** |
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197 | * This function disables all IRQs, and saves the CPU SR state if required. |
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198 | * TODO : Warning this function discards the CU3 access bit |
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199 | * @ old : address of buffer to save the SR (no save if NULL). |
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200 | ****************************************************************************************/ |
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201 | extern inline void hal_disable_all_irq( uint32_t * old ); |
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202 | |
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203 | /***************************************************************************************** |
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204 | * This function enables all IRQs, and saves the CPU SR state if required. |
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205 | * @ old : address of buffer to save the SR (no save if NULL). |
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206 | ****************************************************************************************/ |
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207 | extern inline void hal_enable_all_irq( uint32_t * old ); |
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208 | |
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209 | /***************************************************************************************** |
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210 | * This function returns true if all IRQs are disabled. |
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211 | ****************************************************************************************/ |
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212 | extern inline bool_t hal_all_irq_disabled(); |
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213 | |
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214 | /***************************************************************************************** |
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215 | * This function restores a previously SCPU SR state. |
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216 | * @ old : value to be written in CPU SR register |
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217 | ****************************************************************************************/ |
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218 | extern inline void hal_restore_irq( uint32_t old ); |
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219 | |
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220 | ////////////////////////////////////////////////////////////////////////////////////////// |
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221 | ////////////////////////////////////////////////////////////////////////////////////////// |
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222 | // Atomic Operations / Implementation in cpu/***/atomic.c |
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223 | // |
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224 | // Implementation of atomic read-then-write operations depends on the CPU instruction set. |
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225 | ////////////////////////////////////////////////////////////////////////////////////////// |
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226 | ////////////////////////////////////////////////////////////////////////////////////////// |
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227 | |
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228 | /***************************************************************************************** |
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229 | * This blocking function makes an atomic "and" between a 32 bits mask, and a 32 bits |
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230 | * unsigned int shared variable, returning only when atomic operation is successful. |
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231 | * @ ptr : pointer on the shared variable |
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232 | * @ val : mask value |
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233 | ****************************************************************************************/ |
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234 | extern inline void hal_atomic_and( uint32_t * ptr, |
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235 | uint32_t val ); |
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236 | |
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237 | /***************************************************************************************** |
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238 | * This blocking function makes an atomic "or" between a 32 bits mask, and a 32 bits |
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239 | * unsigned int shared variable, returning only when atomic operation is successful. |
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240 | * @ ptr : pointer on the shared variable |
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241 | * @ val : mask value |
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242 | ****************************************************************************************/ |
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243 | extern inline void hal_atomic_or( uint32_t * ptr, |
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244 | uint32_t val ); |
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245 | |
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246 | /***************************************************************************************** |
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247 | * This blocking function atomically adds a positive or negative value to a 32 bits |
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248 | * unsigned int shared variable, returning only when atomic add is successful. |
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249 | * @ ptr : pointer on the shared variable |
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250 | * @ val : signed value to add |
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251 | * @ return shared variable value before add |
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252 | ****************************************************************************************/ |
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253 | extern inline uint32_t hal_atomic_add( uint32_t * ptr, |
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254 | int32_t val ); |
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255 | |
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256 | /***************************************************************************************** |
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257 | * This blocking function atomically increments a 32 bits unsigned int shared variable, |
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258 | * returning only when atomic increment is successful. |
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259 | * @ ptr : pointer on the shared variable |
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260 | * @ return shared variable value before increment |
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261 | ****************************************************************************************/ |
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262 | extern inline uint32_t hal_atomic_inc( uint32_t * ptr ); |
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263 | |
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264 | /***************************************************************************************** |
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265 | * This blocking function atomically decrements a 32 bits unsigned int shared variable, |
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266 | * returning only when atomic decrement is successful. |
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267 | * @ ptr : pointer on the shared variable |
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268 | * @ return shared variable value before decrement |
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269 | ****************************************************************************************/ |
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270 | extern inline uint32_t hal_atomic_dec( uint32_t * ptr ); |
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271 | |
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272 | /***************************************************************************************** |
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273 | * This non blocking function makes an atomic Compare-And-Swap on a 32 bits unsigned int |
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274 | * shared variable, returning a Boolean to indicate both success and atomicity. |
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275 | * @ ptr : pointer on the shared variable |
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276 | * @ old : expected value for the shared variable |
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277 | * @ new : value to be writen if success |
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278 | * @ return true if (current == old) and (access is atomic) |
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279 | ****************************************************************************************/ |
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280 | extern inline bool_t hal_atomic_cas( uint32_t * ptr, |
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281 | uint32_t old, |
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282 | uint32_t new ); |
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283 | |
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284 | /***************************************************************************************** |
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285 | * This non blocking function makes an atomic Test-And-Set on a 32 bits unsigned int |
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286 | * shared variable, returning a Boolean to indicate both success and atomicity. |
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287 | * @ ptr : pointer on the shared variable |
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288 | * @ val : value to be writen if success |
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289 | * @ return true if (current == 0) and (access is atomic) |
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290 | ****************************************************************************************/ |
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291 | extern inline bool_t hal_atomic_test_set( uint32_t * ptr, |
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292 | uint32_t val ); |
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293 | |
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294 | ////////////////////////////////////////////////////////////////////////////////////////// |
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295 | ////////////////////////////////////////////////////////////////////////////////////////// |
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296 | // L1 cache related operations / Implementation in the cpu/***/cache.c |
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297 | ////////////////////////////////////////////////////////////////////////////////////////// |
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298 | ////////////////////////////////////////////////////////////////////////////////////////// |
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299 | |
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300 | /***************************************************************************************** |
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301 | * This function makes an uncachable read to a 32 bits variable in local memory. |
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302 | * @ ptr : pointer on the variable |
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303 | * @ returns the value |
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304 | ****************************************************************************************/ |
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305 | extern inline uint32_t hal_uncached_read( uint32_t * ptr ); |
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306 | |
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307 | /***************************************************************************************** |
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308 | * This function invalidates the cache line containing a given address. |
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309 | * @ ptr : address in local memory |
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310 | ****************************************************************************************/ |
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311 | extern inline void hal_invalid_dcache_line( void * ptr ); |
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312 | |
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313 | /***************************************************************************************** |
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314 | * This blocking function flushes the write buffer to synchronize all pending writes. |
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315 | ****************************************************************************************/ |
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316 | extern inline void hal_wbflush(); |
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317 | |
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318 | /***************************************************************************************** |
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319 | * This forbids code reordering by the compiler. |
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320 | ****************************************************************************************/ |
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321 | extern inline void hal_rdbar(); |
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322 | |
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323 | /***************************************************************************************** |
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324 | * This function forces the calling core in idle-low-power mode. |
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325 | ****************************************************************************************/ |
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326 | extern inline void hal_core_sleep(); |
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327 | |
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328 | ////////////////////////////////////////////////////////////////////////////////////////// |
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329 | ////////////////////////////////////////////////////////////////////////////////////////// |
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330 | // Remote accesses / implementation in cpu/***/remote.c |
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331 | // |
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332 | // Kernel accesses to local memory bank and peripherals can use normal C pointers. |
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333 | // kernel accesses to remote memory banks or peripherals must use the following |
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334 | // dedicated functions, that can have implementations depending on architectures. |
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335 | ///////////////////////////////////////////////////////////////////////////////////////// |
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336 | ////////////////////////////////////////////////////////////////////////////////////////// |
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337 | |
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338 | /***************************************************************************************** |
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339 | * This function writes a single byte in a remote cluster. |
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340 | * @ xp : extended pointer to remote cluster |
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341 | * @ data : value to be written |
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342 | ****************************************************************************************/ |
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343 | extern inline void hal_remote_sb( xptr_t xp, |
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344 | char data ); |
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345 | |
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346 | /***************************************************************************************** |
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347 | * This function writes an aligned 32 bits word in a remote cluster. |
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348 | * @ xp : extended pointer to remote cluster |
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349 | * @ data : value to be written |
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350 | ****************************************************************************************/ |
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351 | extern inline void hal_remote_sw( xptr_t xp, |
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352 | uint32_t data ); |
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353 | |
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354 | /***************************************************************************************** |
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355 | * This function writes an aligned 64 bits word in a remote cluster. |
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356 | * @ xp : extended pointer to remote cluster |
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357 | * @ data : value to be written |
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358 | ****************************************************************************************/ |
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359 | extern inline void hal_remote_swd( xptr_t xp, |
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360 | uint64_t data ); |
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361 | |
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362 | /***************************************************************************************** |
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363 | * This function writes a pointer (32 or 64 bits) in a remote cluster. |
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364 | * @ xp : extended pointer to remote cluster |
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365 | * @ pt : value to be written |
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366 | ****************************************************************************************/ |
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367 | extern inline void hal_remote_spt( xptr_t xp, |
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368 | void * pt ); |
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369 | |
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370 | /***************************************************************************************** |
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371 | * This function reads a single byte in a remote cluster. |
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372 | * @ xp : extended pointer to remote data |
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373 | * @ return read value |
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374 | ****************************************************************************************/ |
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375 | extern inline char hal_remote_lb( xptr_t xp ); |
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376 | |
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377 | /***************************************************************************************** |
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378 | * This function reads an aligned 32 bits word in a remote cluster. |
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379 | * @ xp : extended pointer to remote data |
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380 | * @ return read value |
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381 | ****************************************************************************************/ |
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382 | extern inline uint32_t hal_remote_lw( xptr_t xp ) |
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383 | |
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384 | /***************************************************************************************** |
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385 | * This function reads an aligned 64 bits word in a remote cluster. |
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386 | * @ xp : extended pointer to remote data |
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387 | * @ return read value |
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388 | ****************************************************************************************/ |
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389 | extern inline uint64_t hal_remote_lwd( xptr_t xp ) |
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390 | |
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391 | /***************************************************************************************** |
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392 | * This function reads a poiter (32 or 64 bits) in a remote cluster. |
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393 | * @ xp : extended pointer to remote data |
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394 | * @ return read value |
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395 | ****************************************************************************************/ |
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396 | extern inline void * hal_remote_lpt( xptr_t xp ); |
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397 | |
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398 | /***************************************************************************************** |
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399 | * This function reads an uncachable 32 bits word in a remote cluster. |
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400 | * @ xp : extended pointer to remote data |
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401 | * @ return read value |
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402 | ****************************************************************************************/ |
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403 | extern inline uint32_t hal_remote_lw_unc( xptr_t xp ); |
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404 | |
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405 | /***************************************************************************************** |
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406 | * This function makes an atomic Compare-And-Swap in a remote cluster. |
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407 | * @ xp : extended pointer to remote data |
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408 | * @ old : expected value |
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409 | * @ new : new value to be written |
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410 | * @ return true if success / return false if failure |
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411 | ****************************************************************************************/ |
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412 | extern inline bool_t hal_remote_atomic_cas( xptr_t xp, |
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413 | uint32_t old, |
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414 | uint32_t new ); |
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415 | |
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416 | /***************************************************************************************** |
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417 | * This function adds atomically an increment to the current value of |
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418 | * a 32 bits integer in a remote cluster. |
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419 | * @ xp : extended pointer to remote data |
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420 | * @ incr : increment value. |
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421 | * @ return old value (before increment) of the remote integer |
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422 | ****************************************************************************************/ |
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423 | extern inline uint32_t hal_remote_atomic_add( xptr_t xp, |
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424 | uint32_t incr ); |
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425 | |
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426 | /***************************************************************************************** |
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427 | * This non blocking function tries to make an atomic increment to the current |
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428 | * value of a 32 bits integer in a remote cluster. |
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429 | * @ xp : extended pointer to remote data |
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430 | * @ incr : increment value. |
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431 | * @ old : local buffer address for the read value (before increment) |
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432 | * @ return true if success / return false if failure |
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433 | ****************************************************************************************/ |
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434 | extern inline error_t hal_remote_atomic_try_add( xptr_t xp, |
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435 | uint32_t incr, |
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436 | uint32_t * old ); |
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437 | |
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438 | /***************************************************************************************** |
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439 | * This function makes a memcpy from a source remote buffer in kernel space to another |
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440 | * destination remote buffer in kernel space. |
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441 | * @ dst : extended pointer to destination buffer |
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442 | * @ src : extended pointer to source buffer |
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443 | * @ size : number of bytes to move |
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444 | ****************************************************************************************/ |
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445 | extern inline void hal_remote_memcpy( xptr_t dst, |
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446 | xptr_t src, |
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447 | size_t size ); |
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448 | |
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449 | //////////////////////////////////////////////////////////////////////////////////////////// |
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450 | //////////////////////////////////////////////////////////////////////////////////////////// |
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451 | // User space access / implementation in cpu/***/uspace.c |
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452 | // |
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453 | // When moving data between user space and kernel space, the user address is always |
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454 | // a virtual address, but the kernel address can be a physical address, on some |
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455 | // architectures. Therefore, data transfers must use the following functions. |
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456 | //////////////////////////////////////////////////////////////////////////////////////////// |
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457 | //////////////////////////////////////////////////////////////////////////////////////////// |
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458 | |
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459 | /***************************************************************************************** |
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460 | * This function tranfers a data buffer from the user space to the kernel space. |
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461 | * @ kdst : destination address in kernel space |
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462 | * @ usrc : source address in user space |
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463 | * @ size : number of bytes to transfer. |
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464 | ****************************************************************************************/ |
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465 | extern void hal_copy_from_uspace( void * kdst, |
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466 | void * usrc, |
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467 | uint32_t size ); |
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468 | |
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469 | /***************************************************************************************** |
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470 | * This function tranfers a data buffer from the kernel space to the user space. |
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471 | * @ udst : destination address in user space. |
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472 | * @ ksrc : source address in kernel space. |
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473 | * @ size : number of bytes to transfer. |
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474 | ****************************************************************************************/ |
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475 | extern void hal_copy_to_uspace( void * udst, |
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476 | void * ksrc, |
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477 | uint32_t size ); |
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478 | |
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479 | #endif /* _HAL_CPU_H_ */ |
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