1 | //////////////////////////////////////////////////////////////////////////////////// |
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2 | // File : kernel_init.c |
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3 | // Date : 26/05/2012 |
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4 | // Authors : alain greiner & mohamed karaoui |
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5 | // Copyright (c) UPMC-LIP6 |
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6 | //////////////////////////////////////////////////////////////////////////////////// |
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7 | // This kernel_init.c file is part of the GIET-VM nano-kernel. |
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8 | //////////////////////////////////////////////////////////////////////////////////// |
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9 | |
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10 | #include <giet_config.h> |
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11 | #include <hard_config.h> |
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12 | #include <utils.h> |
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13 | #include <vmem.h> |
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14 | #include <tty0.h> |
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15 | #include <kernel_malloc.h> |
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16 | #include <kernel_locks.h> |
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17 | #include <kernel_barriers.h> |
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18 | #include <fat32.h> |
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19 | #include <xcu_driver.h> |
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20 | #include <nic_driver.h> |
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21 | #include <hba_driver.h> |
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22 | #include <sdc_driver.h> |
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23 | #include <bdv_driver.h> |
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24 | #include <mmc_driver.h> |
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25 | #include <tty_driver.h> |
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26 | #include <ctx_handler.h> |
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27 | #include <irq_handler.h> |
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28 | #include <sys_handler.h> |
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29 | #include <mapping_info.h> |
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30 | #include <mips32_registers.h> |
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31 | |
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32 | #if !defined(X_SIZE) |
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33 | # error: You must define X_SIZE in the hard_config.h file |
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34 | #endif |
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35 | |
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36 | #if !defined(Y_SIZE) |
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37 | # error: You must define Y_SIZE in the hard_config.h file |
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38 | #endif |
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39 | |
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40 | #if !defined(Y_WIDTH) |
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41 | # error: You must define Y_WIDTH in the hard_config.h file |
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42 | #endif |
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43 | |
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44 | #if !defined(Y_WIDTH) |
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45 | # error: You must define Y_WIDTH in the hard_config.h file |
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46 | #endif |
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47 | |
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48 | #if !defined(NB_PROCS_MAX) |
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49 | # error: You must define NB_PROCS_MAX in the hard_config.h file |
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50 | #endif |
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51 | |
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52 | #if !defined(NB_TOTAL_PROCS) |
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53 | # error: You must define NB_TOTAL_PROCS in the hard_config.h file |
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54 | #endif |
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55 | |
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56 | #if !defined(USE_XCU) |
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57 | # error: You must define USE_XCU in the hard_config.h file |
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58 | #endif |
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59 | |
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60 | #if !defined(USE_PIC) |
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61 | # error: You must define USE_PIC in the hard_config.h file |
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62 | #endif |
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63 | |
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64 | #if !defined(IDLE_THREAD_INDEX) |
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65 | # error: You must define IDLE_THREAD_INDEX in the ctx_handler.h file |
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66 | #endif |
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67 | |
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68 | #if !defined(GIET_TICK_VALUE) |
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69 | # error: You must define GIET_TICK_VALUE in the giet_config.h file |
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70 | #endif |
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71 | |
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72 | #if !defined(GIET_NB_VSPACE_MAX) |
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73 | # error: You must define GIET_NB_VSPACE_MAX in the giet_config.h file |
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74 | #endif |
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75 | |
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76 | #if !defined(NB_TTY_CHANNELS) |
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77 | # error: You must define NB_TTY_CHANNELS in the hard_config.h file |
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78 | #endif |
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79 | |
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80 | #if (NB_TTY_CHANNELS < 1) |
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81 | # error: NB_TTY_CHANNELS cannot be smaller than 1 |
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82 | #endif |
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83 | |
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84 | #if !defined(GIET_ISR_TYPE_MAX) |
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85 | # error: You must define GIET_ISR_TYPE_MAX in the giet_config.h file |
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86 | #endif |
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87 | |
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88 | #if !defined(GIET_ISR_CHANNEL_MAX) |
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89 | # error: You must define GIET_ISR_CHANNEL_MAX in the giet_config.h file |
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90 | #endif |
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91 | |
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92 | |
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93 | //////////////////////////////////////////////////////////////////////////////// |
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94 | // Global variables |
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95 | //////////////////////////////////////////////////////////////////////////////// |
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96 | |
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97 | // array of page tables virtual addresses |
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98 | __attribute__((section(".kdata"))) |
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99 | volatile unsigned int _ptabs_vaddr[GIET_NB_VSPACE_MAX][X_SIZE][Y_SIZE]; |
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100 | |
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101 | // array of page tables PTPR values (physical addresses >> 13) |
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102 | __attribute__((section(".kdata"))) |
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103 | volatile unsigned int _ptabs_ptprs[GIET_NB_VSPACE_MAX][X_SIZE][Y_SIZE]; |
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104 | |
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105 | // Array of pointers on the schedulers |
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106 | __attribute__((section(".kdata"))) |
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107 | volatile static_scheduler_t* _schedulers[X_SIZE][Y_SIZE][NB_PROCS_MAX]; |
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108 | |
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109 | // Synchonisation before entering parallel execution |
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110 | __attribute__((section(".kdata"))) |
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111 | volatile unsigned int _kernel_init_done = 0; |
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112 | |
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113 | // Kernel uses a sqt_lock to protect TTY0 |
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114 | __attribute__((section(".kdata"))) |
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115 | unsigned int _tty0_boot_mode = 0; |
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116 | |
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117 | // Kernel uses a sqt_lock to protect command allocator in HBA |
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118 | __attribute__((section(".kdata"))) |
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119 | unsigned int _hba_boot_mode = 0; |
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120 | |
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121 | // synchronisation barrier for parallel init by all processors |
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122 | __attribute__((section(".kdata"))) |
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123 | sqt_barrier_t _all_procs_barrier __attribute__((aligned(64))); |
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124 | |
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125 | //////////////////////////////////////////////////////////////////////////////// |
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126 | // Extern variables |
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127 | //////////////////////////////////////////////////////////////////////////////// |
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128 | |
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129 | // this variable is allocated in tty0.c file |
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130 | extern sqt_lock_t _tty0_sqt_lock; |
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131 | |
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132 | // this variable is allocated in mmc_driver.c file |
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133 | extern unsigned int _mmc_boot_mode; |
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134 | |
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135 | // this variable is allocated in sys_handler.c file |
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136 | extern unsigned int _tty_channel_alloc[NB_TTY_CHANNELS]; |
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137 | |
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138 | //////////////////////////////////////////////////////////////////////////////// |
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139 | // This kernel_init() function completes the kernel initialisation in 5 steps: |
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140 | // Step 0 is done by processor[0,0,0]. Steps 1 to 4 are executed in parallel |
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141 | // by all processors. |
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142 | // - step 0 : P[0,0,0] Initialise various global variables. |
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143 | // - step 1 : Each processor initialises scheduler pointers array. |
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144 | // - step 2 : Each processor initialises PTAB pointers arrays. |
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145 | // - step 3 : Each processor initialise idle thread and starts TICK timer. |
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146 | // - step 4 : Each processor set sp, sr, ptpr, epc registers values. |
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147 | //////////////////////////////////////////////////////////////////////////////// |
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148 | __attribute__((section (".kinit"))) void kernel_init() |
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149 | { |
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150 | // gpid : hardware processor index (fixed format: X_WIDTH|Y_WIDTH|P_WIDTH) |
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151 | // x,y,p : proc coordinates ( x < X_SIZE / y < Y_SIZE / p < NB_PROCS_MAX ) |
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152 | |
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153 | unsigned int gpid = _get_procid(); |
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154 | unsigned int cluster_xy = gpid >> P_WIDTH; |
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155 | unsigned int x = cluster_xy >> Y_WIDTH & ((1<<X_WIDTH)-1); |
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156 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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157 | unsigned int p = gpid & ((1<<P_WIDTH)-1); |
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158 | unsigned int unused; |
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159 | |
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160 | //////////////////////////////////////////////////////////////////////////// |
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161 | // Step 0 : P[0,0,0] initialises global variables and peripherals |
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162 | //////////////////////////////////////////////////////////////////////////// |
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163 | |
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164 | if ( gpid == 0 ) |
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165 | { |
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166 | ////// distributed kernel heap initialisation |
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167 | _heap_init(); |
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168 | |
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169 | #if GIET_DEBUG_INIT |
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170 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes kernel heap init\n", x, y, p ); |
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171 | #endif |
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172 | ////// distributed locks for MMC |
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173 | _mmc_boot_mode = 0; |
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174 | _mmc_init_locks(); |
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175 | |
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176 | #if GIET_DEBUG_INIT |
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177 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes MMC distributed locks init\n", x , y , p ); |
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178 | #endif |
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179 | ////// distributed lock for TTY0 |
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180 | _sqt_lock_init( &_tty0_sqt_lock ); |
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181 | _tty_channel_alloc[0] = 1; |
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182 | |
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183 | #if GIET_DEBUG_INIT |
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184 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes TTY0 lock init\n", x , y , p ); |
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185 | #endif |
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186 | ////// distributed kernel barrier between all processors |
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187 | _sqt_barrier_init( &_all_procs_barrier ); |
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188 | |
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189 | #if GIET_DEBUG_INIT |
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190 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes barrier init\n", x , y , p ); |
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191 | #endif |
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192 | |
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193 | ////// TTY fifos initialisation |
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194 | unsigned int tty_id; |
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195 | for ( tty_id = 0 ; tty_id < NB_TTY_CHANNELS ; tty_id++) _tty_init( tty_id ); |
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196 | |
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197 | #if GIET_DEBUG_INIT |
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198 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes TTY fifos init\n", x , y , p ); |
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199 | #endif |
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200 | |
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201 | ////// _ext_irq_index[isr][channel] initialisation |
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202 | if ( USE_PIC ) _ext_irq_init(); |
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203 | |
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204 | #if GIET_DEBUG_INIT |
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205 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes ext_irq init\n", x , y , p ); |
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206 | #endif |
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207 | |
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208 | ////// NIC peripheral initialization |
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209 | if ( USE_NIC ) _nic_global_init( 1, // broadcast accepted |
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210 | 1, // bypass activated |
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211 | 0, // tdm non activated |
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212 | 0 ); // tdm period |
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213 | #if GIET_DEBUG_INIT |
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214 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes NIC init\n", x , y , p ); |
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215 | #endif |
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216 | |
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217 | ////// IOC peripheral initialisation |
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218 | if ( USE_IOC_HBA ) |
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219 | { |
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220 | _hba_init(); |
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221 | _ext_irq_alloc( ISR_HBA , 0 , &unused ); |
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222 | |
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223 | #if GIET_DEBUG_INIT |
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224 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes HBA init\n", x , y , p ); |
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225 | #endif |
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226 | } |
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227 | if ( USE_IOC_SDC ) |
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228 | { |
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229 | _sdc_init(); |
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230 | _ext_irq_alloc( ISR_SDC , 0 , &unused ); |
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231 | |
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232 | #if GIET_DEBUG_INIT |
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233 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes SDC init\n", x , y , p ); |
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234 | #endif |
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235 | } |
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236 | if ( USE_IOC_BDV ) |
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237 | { |
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238 | _bdv_init(); |
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239 | _ext_irq_alloc( ISR_BDV , 0 , &unused ); |
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240 | |
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241 | #if GIET_DEBUG_INIT |
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242 | _nolock_printf("\n[DEBUG KINIT] P[%d,%d,%d] completes BDV init\n", x , y , p ); |
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243 | #endif |
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244 | } |
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245 | |
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246 | ////// release other processors |
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247 | _kernel_init_done = 1; |
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248 | } |
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249 | else |
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250 | { |
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251 | while( _kernel_init_done == 0 ) asm volatile ( "nop" ); |
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252 | } |
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253 | |
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254 | /////////////////////////////////////////////////////////////////////////// |
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255 | // Step 1 : each processor get its scheduler vaddr from CP0_SCHED, |
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256 | // contributes to _schedulers[] array initialisation, |
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257 | // and wait completion of array initialisation. |
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258 | /////////////////////////////////////////////////////////////////////////// |
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259 | |
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260 | static_scheduler_t* psched = (static_scheduler_t*)_get_sched(); |
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261 | unsigned int threads = psched->threads; |
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262 | |
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263 | _schedulers[x][y][p] = psched; |
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264 | |
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265 | #if GIET_DEBUG_INIT |
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266 | _printf("\n[DEBUG KINIT] P[%d,%d,%d] initialises SCHED array\n" |
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267 | " - scheduler vbase = %x\n" |
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268 | " - threads = %d\n", |
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269 | x, y, p, (unsigned int)psched, threads ); |
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270 | #endif |
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271 | |
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272 | ///////////////////////////////////////// |
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273 | _sqt_barrier_wait( &_all_procs_barrier ); |
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274 | ///////////////////////////////////////// |
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275 | |
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276 | //////////////////////////////////////////////////////////////////////////// |
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277 | // step 2 : each processor that is allocated at least one thread loops |
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278 | // on its allocated threads: |
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279 | // - contributes to _ptabs_vaddr & _ptabs_ptprs arrays |
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280 | // initialisation, from values stored in the threads contexts. |
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281 | // - set CTX_RA slot with the kernel _ctx_eret() virtual address. |
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282 | // - set CTX_ENTRY & CTX_EPC slots that must contain the thread |
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283 | // entry point. The CTX_ENTRY slot contain only at this point |
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284 | // a pointer on the memory word containing this entry point. |
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285 | //////////////////////////////////////////////////////////////////////////// |
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286 | |
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287 | unsigned int ltid; |
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288 | |
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289 | for (ltid = 0; ltid < threads; ltid++) |
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290 | { |
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291 | unsigned int vsid = _get_thread_slot( x, y, p, ltid , CTX_VSID_ID ); |
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292 | unsigned int ptab = _get_thread_slot( x, y, p, ltid , CTX_PTAB_ID ); |
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293 | unsigned int ptpr = _get_thread_slot( x, y, p, ltid , CTX_PTPR_ID ); |
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294 | |
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295 | // initialize PTABS arrays |
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296 | _ptabs_vaddr[vsid][x][y] = ptab; |
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297 | _ptabs_ptprs[vsid][x][y] = ptpr; |
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298 | |
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299 | // set the PTPR to use the local page table |
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300 | asm volatile( "mtc2 %0, $0" |
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301 | : : "r" (ptpr) ); |
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302 | |
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303 | // set CTX_RA slot |
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304 | unsigned int ctx_ra = (unsigned int)(&_ctx_eret); |
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305 | _set_thread_slot( x, y, p, ltid, CTX_RA_ID, ctx_ra ); |
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306 | |
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307 | // set CTX_ENTRY and CTX_EPC slots |
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308 | unsigned int* ptr = (unsigned int*)_get_thread_slot(x , y , p , ltid , CTX_ENTRY_ID); |
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309 | unsigned int ctx_entry = *ptr; |
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310 | _set_thread_slot( x , y , p , ltid , CTX_ENTRY_ID , ctx_entry ); |
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311 | _set_thread_slot( x , y , p , ltid , CTX_EPC_ID , ctx_entry ); |
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312 | |
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313 | #if GIET_DEBUG_INIT |
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314 | _printf("\n[DEBUG KINIT] P[%d,%d,%d] initialises PTABS arrays" |
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315 | " and context for thread %d \n" |
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316 | " - ptabs_vaddr[%d][%d][%d] = %x\n" |
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317 | " - ptabs_paddr[%d][%d][%d] = %l\n" |
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318 | " - ctx_entry = %x\n" |
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319 | " - ctx_ra = %x\n", |
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320 | x , y , p , ltid , |
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321 | vsid , x , y , ptab , |
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322 | vsid , x , y , ((unsigned long long)ptpr)<<13 , |
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323 | ctx_entry, ctx_ra ); |
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324 | #endif |
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325 | |
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326 | } // end for threads |
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327 | |
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328 | ///////////////////////////////////////// |
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329 | _sqt_barrier_wait( &_all_procs_barrier ); |
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330 | ///////////////////////////////////////// |
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331 | |
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332 | //////////////////////////////////////////////////////////////////////////// |
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333 | // step 3 : - Each processor complete idle thread context initialisation. |
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334 | // Only CTX_SP, CTX_RA, CTX_EPC, CTX_ENTRY slots, because other |
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335 | // slots have been initialised in boot code) |
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336 | // The 4 Kbytes idle stack is implemented in the scheduler itself. |
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337 | // - Each processor starts TICK timer, if at least one thread. |
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338 | // - P[0,0,0] initialises FAT (not done before, because it must |
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339 | // be done after the _ptabs_vaddr[v][x][y] array initialisation, |
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340 | // for V2P translation in _fat_ioc_access() function). |
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341 | //////////////////////////////////////////////////////////////////////////// |
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342 | |
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343 | unsigned int sp = ((unsigned int)psched) + 0x2000; |
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344 | unsigned int ra = (unsigned int)(&_ctx_eret); |
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345 | unsigned int entry = (unsigned int)(&_idle_thread); |
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346 | |
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347 | _set_thread_slot( x , y , p , IDLE_THREAD_INDEX , CTX_SP_ID , sp ); |
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348 | _set_thread_slot( x , y , p , IDLE_THREAD_INDEX , CTX_RA_ID , ra ); |
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349 | _set_thread_slot( x , y , p , IDLE_THREAD_INDEX , CTX_EPC_ID , entry ); |
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350 | _set_thread_slot( x , y , p , IDLE_THREAD_INDEX , CTX_ENTRY_ID , entry ); |
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351 | |
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352 | if (threads > 0) _xcu_timer_start( cluster_xy, p, GIET_TICK_VALUE ); |
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353 | |
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354 | #if GIET_DEBUG_INIT |
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355 | _printf("\n[DEBUG KINIT] P[%d,%d,%d] initializes idle_thread and starts TICK\n", |
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356 | x, y, p ); |
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357 | #endif |
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358 | |
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359 | if ( gpid == 0 ) |
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360 | { |
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361 | _fat_init( 1 ); // kernel mode => Inode-Tree, Fat-Cache and File-Caches |
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362 | |
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363 | #if GIET_DEBUG_INIT |
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364 | _printf("\n[DEBUG KINIT] P[%d,%d,%d] completes kernel FAT init\n", |
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365 | x, y, p ); |
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366 | #endif |
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367 | |
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368 | } |
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369 | |
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370 | ///////////////////////////////////////// |
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371 | _sqt_barrier_wait( &_all_procs_barrier ); |
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372 | ///////////////////////////////////////// |
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373 | |
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374 | //////////////////////////////////////////////////////////////////////////// |
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375 | // step 4 : Each processor computes the thread index (ltid), and the values |
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376 | // to initialize the SP, SR, PTPR, EPC registers. |
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377 | // It jumps to a runable thread if possible, |
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378 | // or jumps to IDLE-THREAD if no runable thread. |
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379 | //////////////////////////////////////////////////////////////////////////// |
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380 | |
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381 | // default value for ltid |
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382 | ltid = IDLE_THREAD_INDEX; |
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383 | |
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384 | // scan allocated threads to find a runable thread |
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385 | unsigned int thread_id; |
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386 | for ( thread_id = 0 ; thread_id < threads ; thread_id++ ) |
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387 | { |
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388 | if ( _get_thread_slot( x, y, p, thread_id, CTX_NORUN_ID ) == 0 ) |
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389 | { |
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390 | ltid = thread_id; |
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391 | break; |
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392 | } |
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393 | } |
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394 | |
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395 | // update scheduler |
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396 | psched->current = ltid; |
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397 | |
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398 | // get values from selected thread context |
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399 | unsigned int sp_value = _get_thread_slot( x, y, p, ltid, CTX_SP_ID); |
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400 | unsigned int sr_value = _get_thread_slot( x, y, p, ltid, CTX_SR_ID); |
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401 | unsigned int ptpr_value = _get_thread_slot( x, y, p, ltid, CTX_PTPR_ID); |
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402 | unsigned int epc_value = _get_thread_slot( x, y, p, ltid, CTX_ENTRY_ID); |
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403 | |
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404 | #if GIET_DEBUG_INIT |
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405 | _printf("\n[DEBUG KINIT] P[%d,%d,%d] completes kernel_init at cycle %d\n" |
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406 | " ltid = %d / sp = %x / sr = %x / ptpr = %x / epc = %x\n", |
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407 | x , y , p , _get_proctime() , |
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408 | ltid , sp_value , sr_value , ptpr_value , epc_value ); |
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409 | #endif |
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410 | |
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411 | // set registers and jump to user code |
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412 | asm volatile ( "move $29, %0 \n" /* SP <= ctx[CTX_SP_ID] */ |
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413 | "mtc0 %1, $12 \n" /* SR <= ctx[CTX_SR_ID] */ |
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414 | "mtc2 %2, $0 \n" /* PTPR <= ctx[CTX_PTPR] */ |
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415 | "mtc0 %3, $14 \n" /* EPC <= ctx[CTX_EPC] */ |
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416 | "eret \n" /* jump to user code */ |
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417 | "nop \n" |
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418 | : |
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419 | : "r"(sp_value), "r"(sr_value), "r"(ptpr_value), "r"(epc_value) |
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420 | : "$29", "memory" ); |
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421 | |
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422 | } // end kernel_init() |
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423 | |
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424 | |
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425 | // Local Variables: |
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426 | // tab-width: 4 |
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427 | // c-basic-offset: 4 |
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428 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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429 | // indent-tabs-mode: nil |
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430 | // End: |
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431 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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432 | |
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