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 <tty0.h> |
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14 | #include <kernel_malloc.h> |
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15 | #include <fat32.h> |
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16 | #include <xcu_driver.h> |
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17 | #include <ioc_driver.h> |
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18 | #include <ctx_handler.h> |
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19 | #include <irq_handler.h> |
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20 | #include <mapping_info.h> |
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21 | #include <mips32_registers.h> |
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22 | |
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23 | #if !defined(X_SIZE) |
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24 | # error: You must define X_SIZE in the hard_config.h file |
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25 | #endif |
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26 | |
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27 | #if !defined(Y_SIZE) |
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28 | # error: You must define Y_SIZE in the hard_config.h file |
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29 | #endif |
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30 | |
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31 | #if !defined(Y_WIDTH) |
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32 | # error: You must define Y_WIDTH in the hard_config.h file |
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33 | #endif |
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34 | |
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35 | #if !defined(Y_WIDTH) |
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36 | # error: You must define Y_WIDTH in the hard_config.h file |
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37 | #endif |
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38 | |
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39 | #if !defined(NB_PROCS_MAX) |
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40 | # error: You must define NB_PROCS_MAX in the hard_config.h file |
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41 | #endif |
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42 | |
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43 | #if !defined(NB_TOTAL_PROCS) |
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44 | # error: You must define NB_TOTAL_PROCS in the hard_config.h file |
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45 | #endif |
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46 | |
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47 | #if !defined(USE_XCU) |
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48 | # error: You must define USE_XCU in the hard_config.h file |
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49 | #endif |
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50 | |
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51 | #if !defined(IDLE_TASK_INDEX) |
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52 | # error: You must define IDLE_TASK_INDEX in the ctx_handler.h file |
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53 | #endif |
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54 | |
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55 | #if !defined(GIET_TICK_VALUE) |
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56 | # error: You must define GIET_TICK_VALUE in the giet_config.h file |
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57 | #endif |
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58 | |
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59 | #if !defined(GIET_NB_VSPACE_MAX) |
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60 | # error: You must define GIET_NB_VSPACE_MAX in the giet_config.h file |
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61 | #endif |
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62 | |
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63 | #if !defined(NB_TTY_CHANNELS) |
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64 | # error: You must define NB_TTY_CHANNELS in the hard_config.h file |
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65 | #endif |
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66 | |
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67 | #if (NB_TTY_CHANNELS < 1) |
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68 | # error: NB_TTY_CHANNELS cannot be smaller than 1 |
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69 | #endif |
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70 | |
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71 | |
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72 | |
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73 | /////////////////////////////////////////////////////////////////////////////////// |
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74 | // Ditributed kernel heap descriptors array (for dynamic memory allocation) |
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75 | /////////////////////////////////////////////////////////////////////////////////// |
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76 | |
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77 | kernel_heap_t kernel_heap[X_SIZE][Y_SIZE]; |
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78 | |
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79 | /////////////////////////////////////////////////////////////////////////////////// |
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80 | // FAT internal representation for kernel code |
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81 | /////////////////////////////////////////////////////////////////////////////////// |
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82 | |
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83 | fat32_fs_t fat __attribute__((aligned(512))); |
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84 | |
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85 | /////////////////////////////////////////////////////////////////////////////////// |
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86 | // array of pointers on the page tables (virtual addresses) |
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87 | /////////////////////////////////////////////////////////////////////////////////// |
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88 | |
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89 | volatile unsigned int _ptabs_vaddr[GIET_NB_VSPACE_MAX]; // virtual addresses |
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90 | volatile unsigned int _ptabs_ptprs[GIET_NB_VSPACE_MAX]; // physical addresses >> 13 |
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91 | |
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92 | /////////////////////////////////////////////////////////////////////////////////// |
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93 | // Array of pointers on the schedulers (physical addresses) |
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94 | /////////////////////////////////////////////////////////////////////////////////// |
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95 | |
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96 | volatile static_scheduler_t* _schedulers[X_SIZE][Y_SIZE][NB_PROCS_MAX]; |
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97 | |
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98 | //////////////////////////////////////////////////////////////////////////////////// |
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99 | // Synchonisation barrier before jumping to user code |
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100 | //////////////////////////////////////////////////////////////////////////////////// |
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101 | |
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102 | volatile unsigned int kernel_init_barrier = 0; |
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103 | |
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104 | //////////////////////////////////////////////////////////////////////////////////// |
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105 | // Global variables for TTY/kernel communications |
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106 | //////////////////////////////////////////////////////////////////////////////////// |
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107 | |
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108 | sbt_lock_t _tty_tx_lock[NB_TTY_CHANNELS] __attribute__((aligned(64))); |
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109 | |
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110 | unsigned int _tty_rx_buf[NB_TTY_CHANNELS]; |
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111 | unsigned int _tty_rx_full[NB_TTY_CHANNELS]; |
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112 | |
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113 | |
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114 | |
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115 | |
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116 | |
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117 | /////////////////////////////////////////////////////////////////////////////////// |
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118 | // This kernel_init() function completes the kernel initialisation in 7 steps: |
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119 | // All processors execute this code, but this is done sequencially. |
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120 | // - step 0 : Initialise fat, heap descriptors, and tty locks |
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121 | // - step 1 : Initialise scheduler pointers array |
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122 | // - step 2 : Initialise PTAB pointers arrays |
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123 | // - step 3 : Initialise private XCU masks |
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124 | // - step 4 : |
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125 | // - step 5 : |
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126 | // - step 6 : |
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127 | /////////////////////////////////////////////////////////////////////////////////// |
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128 | __attribute__((section (".kinit"))) void kernel_init() |
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129 | { |
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130 | // gpid : hardware processor index (fixed format: X_WIDTH|Y_WIDTH|P_WIDTH) |
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131 | // p : local processor id in a cluster ( p < NB_PROCS_MAX) |
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132 | // cpid : continuous processor index = (((x * Y_SIZE + y) * NB_PROCS_MAX) + p |
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133 | |
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134 | unsigned int gpid = _get_procid(); |
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135 | unsigned int cluster_xy = gpid >> P_WIDTH; |
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136 | unsigned int x = cluster_xy >> Y_WIDTH & ((1<<X_WIDTH)-1); |
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137 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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138 | unsigned int p = gpid & ((1<<P_WIDTH)-1); |
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139 | unsigned int cpid = ((( x * Y_SIZE) + y) * NB_PROCS_MAX) + p; |
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140 | |
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141 | // This initialisation is done sequencially by each processor |
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142 | while( cpid != kernel_init_barrier ) asm volatile ( "nop" ); |
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143 | |
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144 | // Step 0 : P[0,0,0] initialises the kernel FAT |
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145 | // and the distributed kernel_heap descriptors array. |
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146 | if ( gpid == 0 ) |
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147 | { |
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148 | _heap_init(); |
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149 | |
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150 | #if GIET_DEBUG_INIT |
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151 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes kernel HEAP init\n", x, y, p ); |
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152 | #endif |
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153 | unsigned int channel; |
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154 | for ( channel = 0 ; channel < NB_TTY_CHANNELS ; channel++ ) |
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155 | { |
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156 | _sbt_lock_init( &_tty_tx_lock[channel] ); |
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157 | } |
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158 | |
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159 | #if GIET_DEBUG_INIT |
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160 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes TTY locks init\n", x, y, p ); |
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161 | #endif |
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162 | |
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163 | _fat_init( IOC_BOOT_MODE ); |
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164 | |
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165 | #if GIET_DEBUG_INIT |
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166 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes kernel FAT init\n", x, y, p ); |
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167 | #endif |
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168 | |
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169 | } |
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170 | |
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171 | // Step 1 : each processor get its scheduler virtual address from CP0_SCHED register |
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172 | // and contributes to _schedulers[] array initialisation |
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173 | |
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174 | static_scheduler_t* psched = (static_scheduler_t*)_get_sched(); |
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175 | unsigned int tasks = psched->tasks; |
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176 | |
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177 | _schedulers[x][y][p] = psched; |
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178 | |
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179 | #if GIET_DEBUG_INIT |
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180 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] initialises SCHED array\n" |
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181 | " - scheduler vbase = %x\n" |
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182 | " - tasks = %d\n", |
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183 | x, y, p, (unsigned int)psched, tasks ); |
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184 | #endif |
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185 | |
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186 | // step 2 : each processor that is allocated at least one task loops |
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187 | // on all allocated tasks: |
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188 | // - contributes to _ptabs_vaddr[] & _ptabs_ptprs[] initialisation. |
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189 | // - set CTX_RA slot with the kernel _ctx_eret() virtual address. |
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190 | // - set CTX_EPC slot that must contain the task entry point, |
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191 | // and contain only at this point the virtual address of the memory |
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192 | // location containing this entry point. |
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193 | |
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194 | unsigned int ltid; |
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195 | |
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196 | for (ltid = 0; ltid < tasks; ltid++) |
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197 | { |
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198 | unsigned int vsid = _get_task_slot( x, y, p, ltid , CTX_VSID_ID ); |
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199 | unsigned int ptab = _get_task_slot( x, y, p, ltid , CTX_PTAB_ID ); |
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200 | unsigned int ptpr = _get_task_slot( x, y, p, ltid , CTX_PTPR_ID ); |
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201 | |
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202 | // initialize PTABS arrays |
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203 | _ptabs_vaddr[vsid] = ptab; |
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204 | _ptabs_ptprs[vsid] = ptpr; |
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205 | |
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206 | #if GIET_DEBUG_INIT |
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207 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] initialises PTABS arrays\n" |
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208 | " - ptabs_vaddr[%d] = %x / ptpr_paddr[%d] = %l\n", |
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209 | x, y, p, |
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210 | vsid, ptab, vsid, ((unsigned long long)ptpr)<<13 ); |
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211 | #endif |
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212 | |
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213 | // set the ptpr to use the task page table |
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214 | asm volatile( "mtc2 %0, $0 \n" |
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215 | : : "r" (ptpr) ); |
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216 | |
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217 | // compute ctx_ra |
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218 | unsigned int ctx_ra = (unsigned int)(&_ctx_eret); |
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219 | _set_task_slot( x, y, p, ltid, CTX_RA_ID, ctx_ra ); |
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220 | |
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221 | // compute ctx_epc |
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222 | unsigned int* ptr = (unsigned int*)_get_task_slot( x, y, p, ltid, CTX_EPC_ID ); |
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223 | _set_task_slot( x, y, p, ltid, CTX_EPC_ID, *ptr ); |
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224 | |
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225 | #if GIET_DEBUG_INIT |
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226 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] updates context for task %d\n" |
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227 | " - ctx_epc = %x\n" |
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228 | " - ctx_ra = %x\n", |
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229 | x, y, p, ltid, |
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230 | _get_task_slot( x, y, p, ltid, CTX_EPC_ID ), |
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231 | _get_task_slot( x, y, p, ltid, CTX_RA_ID ) ); |
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232 | #endif |
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233 | |
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234 | } // end for tasks |
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235 | |
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236 | // step 3 : compute and set XCU masks |
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237 | |
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238 | unsigned int isr_switch_index = 0xFFFFFFFF; |
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239 | unsigned int hwi_mask = 0; |
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240 | unsigned int pti_mask = 0; |
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241 | unsigned int wti_mask = 0; |
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242 | unsigned int irq_id; // IN_IRQ index |
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243 | unsigned int entry; // interrupt vector entry |
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244 | |
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245 | for (irq_id = 0; irq_id < 32; irq_id++) |
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246 | { |
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247 | entry = psched->hwi_vector[irq_id]; |
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248 | if ( entry & 0x80000000 ) hwi_mask = hwi_mask | (1<<irq_id); |
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249 | if ( (entry & 0x0000FFFF) == ISR_TICK ) isr_switch_index = irq_id; |
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250 | |
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251 | entry = psched->pti_vector[irq_id]; |
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252 | if ( entry & 0x80000000 ) pti_mask = pti_mask | (1<<irq_id); |
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253 | if ( (entry & 0x0000FFFF) == ISR_TICK ) isr_switch_index = irq_id; |
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254 | |
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255 | entry = psched->wti_vector[irq_id]; |
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256 | if ( entry & 0x80000000 ) wti_mask = wti_mask | (1<<irq_id); |
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257 | if ( (entry & 0x0000FFFF) == ISR_TICK ) isr_switch_index = irq_id; |
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258 | } |
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259 | |
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260 | #if GIET_DEBUG_INIT |
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261 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] sets XCU masks\n" |
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262 | " - XCU HWI_MASK = %x\n" |
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263 | " - XCU WTI_MASK = %x\n" |
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264 | " - XCU PTI_MASK = %x\n", |
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265 | x, y, p, hwi_mask, wti_mask, pti_mask ); |
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266 | #endif |
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267 | |
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268 | unsigned int channel = p * IRQ_PER_PROCESSOR; |
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269 | |
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270 | _xcu_set_mask( cluster_xy, channel, hwi_mask, IRQ_TYPE_HWI ); |
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271 | _xcu_set_mask( cluster_xy, channel, wti_mask, IRQ_TYPE_WTI ); |
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272 | _xcu_set_mask( cluster_xy, channel, pti_mask, IRQ_TYPE_PTI ); |
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273 | |
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274 | // step 4 : start TICK timer if at least one task |
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275 | if (tasks > 0) |
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276 | { |
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277 | // one ISR_TICK must be defined for each proc |
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278 | if (isr_switch_index == 0xFFFFFFFF) |
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279 | { |
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280 | _nolock_printf("\n[GIET ERROR] ISR_TICK not found for processor[%d,%d,%d]\n", |
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281 | x, y, p ); |
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282 | _exit(); |
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283 | } |
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284 | |
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285 | // start system timer |
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286 | _xcu_timer_start( cluster_xy, isr_switch_index, GIET_TICK_VALUE ); |
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287 | |
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288 | } |
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289 | |
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290 | #if GIET_DEBUG_INIT |
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291 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] starts TICK timer\n", |
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292 | x, y, p ); |
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293 | #endif |
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294 | |
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295 | // step 5 : each processor updates the idle_task context: |
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296 | // (CTX_SP, CTX_RA, CTX_EPC). |
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297 | // The 4 Kbytes idle stack is implemented in the scheduler. |
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298 | // The PTPR register, the CTX_PTPR and CTX_PTAB slots |
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299 | // have been initialised in boot code. |
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300 | |
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301 | unsigned int pstack = ((unsigned int)psched) + 0x2000; |
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302 | |
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303 | _set_task_slot( x, y, p, IDLE_TASK_INDEX, CTX_SP_ID, pstack); |
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304 | _set_task_slot( x, y, p, IDLE_TASK_INDEX, CTX_RA_ID, (unsigned int) &_ctx_eret); |
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305 | _set_task_slot( x, y, p, IDLE_TASK_INDEX, CTX_EPC_ID, (unsigned int) &_idle_task); |
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306 | |
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307 | #if GIET_DEBUG_INIT |
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308 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] initializes IDLE task\n" |
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309 | " - stack_base = %x\n" |
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310 | " - stack_size = 0x1000\n", |
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311 | x, y, p, pstack - 0x1000 ); |
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312 | #endif |
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313 | |
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314 | // step 6 : when all processors reach the synchronisation barrier, |
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315 | // each processor set registers SP, SR, PTPR, EPC, |
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316 | // with the values corresponding to the first allocated task, |
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317 | // or to the idle_task if there is no task allocated, |
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318 | // and jump to user code |
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319 | |
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320 | if (tasks == 0) |
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321 | { |
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322 | ltid = IDLE_TASK_INDEX; |
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323 | |
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324 | _nolock_printf("\n[GIET WARNING] No task allocated to processor[%d,%d,%d]\n", |
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325 | x, y, p ); |
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326 | } |
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327 | else |
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328 | { |
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329 | ltid = 0; |
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330 | } |
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331 | |
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332 | unsigned int sp_value = _get_task_slot( x, y, p, ltid, CTX_SP_ID); |
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333 | unsigned int sr_value = _get_task_slot( x, y, p, ltid, CTX_SR_ID); |
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334 | unsigned int ptpr_value = _get_task_slot( x, y, p, ltid, CTX_PTPR_ID); |
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335 | unsigned int epc_value = _get_task_slot( x, y, p, ltid, CTX_EPC_ID); |
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336 | |
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337 | #if GIET_DEBUG_INIT |
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338 | _nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] reach barrier at cycle %d\n", |
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339 | x, y, p, _get_proctime() ); |
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340 | #endif |
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341 | |
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342 | // increment barrier counter |
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343 | kernel_init_barrier++; |
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344 | |
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345 | // busy waiting until all processors synchronized |
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346 | while ( kernel_init_barrier != NB_TOTAL_PROCS ); |
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347 | |
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348 | #if GIET_DEBUG_INIT |
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349 | _printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] initializes registers at cycle %d\n" |
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350 | " - sp = %x\n" |
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351 | " - sr = %x\n" |
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352 | " - ptpr = %x\n" |
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353 | " - epc = %x\n", |
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354 | x, y, p, _get_proctime(), |
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355 | sp_value, sr_value, ptpr_value, epc_value ); |
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356 | #endif |
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357 | |
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358 | // set registers and jump to user code |
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359 | asm volatile ( "move $29, %0 \n" /* SP <= ctx[CTX_SP_ID] */ |
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360 | "mtc0 %1, $12 \n" /* SR <= ctx[CTX_SR_ID] */ |
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361 | "mtc2 %2, $0 \n" /* PTPR <= ctx[CTX_PTPR] */ |
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362 | "mtc0 %3, $14 \n" /* EPC <= ctx[CTX_EPC] */ |
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363 | "eret \n" /* jump to user code */ |
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364 | "nop \n" |
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365 | : |
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366 | : "r"(sp_value), "r"(sr_value), "r"(ptpr_value), "r"(epc_value) |
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367 | : "$29", "memory" ); |
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368 | |
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369 | } // end kernel_init() |
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370 | |
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371 | |
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372 | // Local Variables: |
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373 | // tab-width: 4 |
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374 | // c-basic-offset: 4 |
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375 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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376 | // indent-tabs-mode: nil |
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377 | // End: |
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378 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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379 | |
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