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 | // The kernel_init.c files is part of the GIET-VM nano-kernel. |
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8 | // It contains the kernel entry point for the second phase of system initialisation: |
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9 | // all processors are jumping to _kernel_init, but P[0] is first because other |
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10 | // processors are blocked until P[0] complete initilisation of task contexts, |
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11 | // vobjs and peripherals. |
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12 | // All procs in this phase have their MMU activated, because each processor P[i] |
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13 | // must initialise registers SP, SR, PTPR and EPC with informations stored |
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14 | // in _scheduler[i]. |
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15 | //////////////////////////////////////////////////////////////////////////////////// |
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16 | |
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17 | #include <common.h> |
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18 | #include <ctx_handler.h> |
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19 | #include <sys_handler.h> |
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20 | #include <mapping_info.h> |
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21 | #include <giet_config.h> |
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22 | #include <mips32_registers.h> |
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23 | #include <irq_handler.h> |
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24 | #include <vm_handler.h> |
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25 | #include <hwr_mapping.h> |
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26 | #include <mwmr_channel.h> |
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27 | #include <barrier.h> |
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28 | #include <drivers.h> |
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29 | |
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30 | #define in_kinit __attribute__((section (".kinit"))) |
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31 | |
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32 | /////////////////////////////////////////////////////////////////////////////////// |
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33 | // declarations required to avoid forward references |
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34 | /////////////////////////////////////////////////////////////////////////////////// |
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35 | |
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36 | void _kernel_vobjs_init(unsigned int*); |
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37 | void _kernel_tasks_init(unsigned int*); |
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38 | void _kernel_peripherals_init(void); |
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39 | void _kernel_interrupt_vector_init(void); |
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40 | void _kernel_start_all_procs(void); |
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41 | |
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42 | ////////////////////////////////////////////////////////////////////////////////// |
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43 | // This function is the entry point for the second step of the boot sequence. |
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44 | ////////////////////////////////////////////////////////////////////////////////// |
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45 | in_kinit void _kernel_init() |
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46 | { |
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47 | // array of pointers on the page tables (used for task context initialisation) |
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48 | unsigned int kernel_ptabs[GIET_NB_VSPACE_MAX]; |
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49 | |
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50 | // values to be written in registers |
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51 | unsigned int sp_value; |
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52 | unsigned int sr_value; |
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53 | unsigned int ptpr_value; |
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54 | unsigned int epc_value; |
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55 | |
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56 | unsigned int pid = _procid(); |
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57 | |
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58 | // only processor 0 executes system initialisation |
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59 | if ( pid == 0 ) |
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60 | { |
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61 | _kernel_vobjs_init(kernel_ptabs); |
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62 | _kernel_tasks_init(kernel_ptabs); |
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63 | _kernel_interrupt_vector_init(); |
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64 | _kernel_peripherals_init(); |
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65 | _kernel_start_all_procs(); |
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66 | } |
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67 | |
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68 | // each processor initialises it's SP, SR, PTPR, and EPC registers |
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69 | // from values defined in _scheduler[pid], starts it's private |
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70 | // context switch timer (if there is more than one task allocated) |
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71 | // and jumps to user code. |
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72 | // It does nothing, and keep idle if no task allocated. |
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73 | |
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74 | static_scheduler_t* sched = &_scheduler[pid]; |
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75 | |
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76 | if ( sched->tasks ) // at leat one task allocated |
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77 | { |
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78 | // initialise registers |
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79 | sp_value = sched->context[0][CTX_SP_ID]; |
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80 | sr_value = sched->context[0][CTX_SR_ID]; |
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81 | ptpr_value = sched->context[0][CTX_PTPR_ID]; |
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82 | epc_value = sched->context[0][CTX_EPC_ID]; |
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83 | |
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84 | // start TICK timer |
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85 | if ( sched->tasks > 1 ) |
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86 | { |
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87 | unsigned int cluster_id = pid / NB_PROCS; |
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88 | unsigned int proc_id = pid % NB_PROCS; |
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89 | _timer_write( cluster_id, proc_id, TIMER_PERIOD, GIET_TICK_VALUE ); |
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90 | _timer_write( cluster_id, proc_id, TIMER_MODE , 0x3 ); |
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91 | } |
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92 | } |
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93 | else // no task allocated |
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94 | { |
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95 | _get_lock( &_tty_put_lock ); |
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96 | _puts("\n No task allocated to processor "); |
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97 | _putw( pid ); |
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98 | _puts(" => keep idle\n"); |
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99 | _release_lock ( &_tty_put_lock ); |
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100 | |
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101 | // enable interrupts in kernel mode |
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102 | asm volatile ( "li $26, 0xFF01 \n" |
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103 | "mtc0 $26, $12 \n" |
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104 | ::: "$26" ); |
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105 | |
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106 | // infinite loop in kernel mode |
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107 | while (1) asm volatile("nop"); |
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108 | } |
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109 | |
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110 | asm volatile ( |
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111 | "move $29, %0 \n" /* SP <= ctx[CTX_SP_ID] */ |
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112 | "mtc0 %1, $12 \n" /* SR <= ctx[CTX_SR_ID] */ |
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113 | "mtc2 %2, $0 \n" /* PTPR <= ctx[CTX_PTPR_ID] */ |
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114 | "mtc0 %3, $14 \n" /* EPC <= ctx[CTX_EPC_ID] */ |
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115 | "eret \n" /* jump to user code */ |
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116 | "nop \n" |
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117 | : |
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118 | : "r"(sp_value), "r"(sr_value), "r"(ptpr_value), "r"(epc_value) ); |
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119 | |
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120 | } // end _kernel_init() |
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121 | |
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122 | ////////////////////////////////////////////////////////////////////////////////// |
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123 | // This function wakeup all processors. |
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124 | // It should be executed by P[0] when the kernel initialisation is done. |
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125 | ////////////////////////////////////////////////////////////////////////////////// |
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126 | in_kinit void _kernel_start_all_procs() |
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127 | { |
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128 | mapping_header_t* header = (mapping_header_t*)&seg_mapping_base; |
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129 | |
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130 | _puts("\n[INIT] Starting parallel execution at cycle : "); |
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131 | _putw( _proctime() ); |
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132 | _puts("\n"); |
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133 | |
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134 | header->signature = OUT_MAPPING_SIGNATURE; |
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135 | } |
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136 | |
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137 | ////////////////////////////////////////////////////////////////////////////////// |
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138 | // _eret() |
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139 | // The address of this function is used to initialise the return address (RA) |
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140 | // in all task contexts (when the task has never been executed. |
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141 | ////////////////////////////////////////////////////////////////////////////////// |
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142 | in_kinit void _eret() |
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143 | { |
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144 | asm volatile("eret \n" |
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145 | "nop"); |
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146 | } |
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147 | |
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148 | /////////////////////////////////////////////////////////////////////////////// |
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149 | // This function maps a given task, defined in a given vspace |
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150 | // on the processor allocated in the mapping_info structure, |
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151 | // and initialises the task context. |
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152 | // There is one scheduler per processor, and processor can be shared |
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153 | // by several applications running in different vspaces. |
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154 | // There is one private context array handled by each scheduler. |
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155 | // |
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156 | // The following values must be initialised in all task contexts: |
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157 | // - sp stack pointer = stack_base + stack_length |
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158 | // - ra return address = &_eret |
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159 | // - epc start address = start_vector[task->startid] |
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160 | // - sr status register = OxFF13 |
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161 | // - tty TTY terminal index (global index) |
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162 | // - fb FB_DMA channel index (global index) |
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163 | // - ptpr page table base address / 8K |
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164 | // - mode mmu_mode = 0xF (TLBs and caches activated) |
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165 | //////////////////////////////////////////////////////////////////////////////// |
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166 | in_kinit void _task_map( unsigned int task_id, // global index |
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167 | unsigned int vspace_id, // global index |
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168 | unsigned int tty_id, // TTY index |
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169 | unsigned int fb_id, // FB index |
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170 | unsigned int pt_base ) // page table base adddress |
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171 | { |
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172 | mapping_header_t* header = (mapping_header_t*)&seg_mapping_base; |
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173 | |
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174 | mapping_task_t* task = _get_task_base(header); |
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175 | mapping_vspace_t* vspace = _get_vspace_base(header); |
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176 | mapping_vobj_t* vobj = _get_vobj_base( header ); |
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177 | |
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178 | // values to be initialised in task context |
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179 | unsigned int ra = (unsigned int)&_eret; |
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180 | unsigned int sr = 0x0000FF13; |
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181 | unsigned int tty = tty_id; |
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182 | unsigned int fb = fb_id; |
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183 | unsigned int ptpr = pt_base >> 13; |
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184 | unsigned int mode = 0xF; |
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185 | unsigned int sp; |
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186 | unsigned int epc; |
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187 | |
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188 | // compute epc value |
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189 | // Get the (virtual) base address of the start_vector that |
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190 | // contains the start addresses for all tasks defined in a vspace. |
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191 | mapping_vobj_t* vobj_data = &vobj[vspace[vspace_id].vobj_offset + |
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192 | vspace[vspace_id].start_offset]; |
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193 | unsigned int* start_vector = (unsigned int*)vobj_data->vaddr; |
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194 | epc = start_vector[task[task_id].startid]; |
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195 | |
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196 | // compute sp value |
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197 | // Get the vobj containing the stack |
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198 | unsigned int vobj_id = task[task_id].vobjlocid + vspace[vspace_id].vobj_offset; |
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199 | sp = vobj[vobj_id].vaddr + vobj[vobj_id].length; |
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200 | |
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201 | // compute global processor index |
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202 | unsigned int proc_id = task[task_id].clusterid * NB_PROCS + task[task_id].proclocid; |
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203 | |
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204 | // compute and check local task index |
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205 | unsigned int ltid = _scheduler[proc_id].tasks; |
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206 | if ( ltid >= GIET_NB_TASKS_MAX ) |
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207 | { |
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208 | _puts("\n[INIT ERROR] : too much tasks allocated to processor "); |
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209 | _putw( proc_id ); |
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210 | _puts("\n"); |
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211 | _exit(); |
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212 | } |
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213 | |
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214 | // update number of tasks allocated to scheduler |
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215 | _scheduler[proc_id].tasks = ltid + 1; |
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216 | |
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217 | // initializes the task context |
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218 | _scheduler[proc_id].context[ltid][CTX_SR_ID] = sr; |
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219 | _scheduler[proc_id].context[ltid][CTX_SP_ID] = sp; |
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220 | _scheduler[proc_id].context[ltid][CTX_RA_ID] = ra; |
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221 | _scheduler[proc_id].context[ltid][CTX_EPC_ID] = epc; |
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222 | _scheduler[proc_id].context[ltid][CTX_TTY_ID] = tty; |
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223 | _scheduler[proc_id].context[ltid][CTX_FBDMA_ID] = fb; |
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224 | _scheduler[proc_id].context[ltid][CTX_PTPR_ID] = ptpr; |
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225 | _scheduler[proc_id].context[ltid][CTX_MODE_ID] = mode; |
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226 | _scheduler[proc_id].context[ltid][CTX_TASK_ID] = task_id; |
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227 | |
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228 | #if INIT_DEBUG |
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229 | _puts("Task "); |
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230 | _puts( task[task_id].name ); |
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231 | _puts(" allocated to processor "); |
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232 | _putw( proc_id ); |
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233 | _puts(" / ltid = "); |
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234 | _putw( ltid ); |
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235 | _puts("\n"); |
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236 | |
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237 | _puts(" - SR = "); |
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238 | _putw( sr ); |
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239 | _puts(" saved at "); |
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240 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_SR_ID] ); |
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241 | _puts("\n"); |
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242 | |
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243 | _puts(" - RA = "); |
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244 | _putw( ra ); |
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245 | _puts(" saved at "); |
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246 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_RA_ID] ); |
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247 | _puts("\n"); |
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248 | |
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249 | _puts(" - SP = "); |
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250 | _putw( sp ); |
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251 | _puts(" saved at "); |
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252 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_SP_ID] ); |
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253 | _puts("\n"); |
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254 | |
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255 | _puts(" - EPC = "); |
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256 | _putw( epc ); |
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257 | _puts(" saved at "); |
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258 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_EPC_ID] ); |
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259 | _puts("\n"); |
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260 | |
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261 | _puts(" - TTY = "); |
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262 | _putw( tty ); |
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263 | _puts(" saved at "); |
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264 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_TTY_ID] ); |
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265 | _puts("\n"); |
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266 | |
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267 | _puts(" - FB = "); |
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268 | _putw( fb ); |
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269 | _puts(" saved at "); |
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270 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_FBDMA_ID] ); |
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271 | _puts("\n"); |
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272 | |
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273 | _puts(" - PTPR = "); |
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274 | _putw( ptpr<<13 ); |
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275 | _puts(" saved at "); |
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276 | _putw( (unsigned int)&_scheduler[proc_id].context[ltid][CTX_PTPR_ID] ); |
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277 | _puts("\n"); |
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278 | #endif |
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279 | |
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280 | } // end _task_map() |
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281 | |
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282 | /////////////////////////////////////////////////////////////////////////////// |
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283 | // This function initializes all private vobjs defined in the vspaces, |
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284 | // such as mwmr channels, barriers and locks, depending on the vobj type. |
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285 | // (Most of the vobjs are not known, and not initialised by the compiler). |
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286 | // This function initialises the kernel_ptabs[] array indexed by the vspace_id, |
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287 | // and containint the base addresses of all page tables. |
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288 | // This kernel_ptabs[] array is used to initialise the task contexts. |
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289 | /////////////////////////////////////////////////////////////////////////////// |
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290 | in_kinit void _kernel_vobjs_init( unsigned int* kernel_ptabs ) |
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291 | { |
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292 | mapping_header_t* header = (mapping_header_t*)&seg_mapping_base; |
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293 | mapping_vspace_t* vspace = _get_vspace_base( header ); |
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294 | mapping_vobj_t* vobj = _get_vobj_base( header ); |
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295 | |
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296 | unsigned int vspace_id; |
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297 | unsigned int vobj_id; |
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298 | |
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299 | // loop on the vspaces |
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300 | for ( vspace_id = 0 ; vspace_id < header->vspaces ; vspace_id++ ) |
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301 | { |
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302 | char ptab_found = 0; |
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303 | |
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304 | #if INIT_DEBUG |
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305 | _puts("[INIT] --- vobjs initialisation in vspace "); |
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306 | _puts(vspace[vspace_id].name); |
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307 | _puts("\n"); |
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308 | #endif |
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309 | // loop on the vobjs |
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310 | for(vobj_id= vspace[vspace_id].vobj_offset; |
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311 | vobj_id < (vspace[vspace_id].vobj_offset+ vspace[vspace_id].vobjs); |
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312 | vobj_id++) |
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313 | { |
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314 | switch( vobj[vobj_id].type ) |
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315 | { |
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316 | case VOBJ_TYPE_PTAB: // initialise page table pointers array |
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317 | { |
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318 | ptab_found = 1; |
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319 | kernel_ptabs[vspace_id] = vobj[vobj_id].paddr; |
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320 | |
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321 | #if INIT_DEBUG |
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322 | _puts("[INIT] PTAB address = "); |
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323 | _putw(kernel_ptabs[vspace_id]); |
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324 | _puts("\n"); |
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325 | #endif |
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326 | break; |
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327 | } |
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328 | case VOBJ_TYPE_MWMR: // storage capacity is (vobj.length/4 - 5) words |
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329 | { |
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330 | mwmr_channel_t* mwmr = (mwmr_channel_t*)(vobj[vobj_id].vaddr); |
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331 | mwmr->ptw = 0; |
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332 | mwmr->ptr = 0; |
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333 | mwmr->sts = 0; |
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334 | mwmr->depth = (vobj[vobj_id].length>>2) - 5; |
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335 | mwmr->lock = 0; |
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336 | #if INIT_DEBUG |
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337 | _puts("[INIT] MWMR channel "); |
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338 | _puts( vobj->name); |
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339 | _puts(" / depth = "); |
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340 | _putw( mwmr->depth ); |
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341 | _puts("\n"); |
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342 | #endif |
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343 | break; |
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344 | } |
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345 | case VOBJ_TYPE_ELF: // initialisation done by the loader |
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346 | { |
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347 | |
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348 | #if INIT_DEBUG |
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349 | _puts("[INIT] ELF section "); |
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350 | _puts( vobj->name); |
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351 | _puts(" / length = "); |
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352 | _putw( vobj->length ); |
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353 | _puts("\n"); |
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354 | #endif |
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355 | break; |
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356 | } |
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357 | case VOBJ_TYPE_BARRIER: // init is the number of participants |
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358 | { |
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359 | giet_barrier_t* barrier = (giet_barrier_t*)(vobj[vobj_id].vaddr); |
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360 | barrier->count = 0; |
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361 | barrier->init = vobj[vobj_id].init; |
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362 | #if INIT_DEBUG |
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363 | _puts(" BARRIER "); |
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364 | _puts( vobj->name); |
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365 | _puts(" / init_value = "); |
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366 | _putw( barrier->init ); |
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367 | _puts("\n"); |
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368 | #endif |
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369 | break; |
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370 | } |
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371 | case VOBJ_TYPE_LOCK: // init is "not taken" |
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372 | { |
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373 | unsigned int* lock = (unsigned int*)(vobj[vobj_id].vaddr); |
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374 | *lock = 0; |
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375 | #if INIT_DEBUG |
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376 | _puts(" LOCK "); |
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377 | _puts( vobj->name); |
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378 | _puts("\n"); |
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379 | #endif |
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380 | break; |
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381 | } |
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382 | case VOBJ_TYPE_BUFFER: // nothing to do |
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383 | { |
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384 | |
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385 | #if INIT_DEBUG |
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386 | _puts(" BUFFER "); |
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387 | _puts( vobj->name); |
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388 | _puts(" / length = "); |
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389 | _putw( vobj->length ); |
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390 | _puts("\n"); |
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391 | #endif |
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392 | break; |
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393 | } |
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394 | default: |
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395 | { |
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396 | _puts("\n[INIT ERROR] illegal vobj of name "); |
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397 | _puts(vobj->name); |
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398 | _puts(" / in vspace = "); |
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399 | _puts(vobj->name); |
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400 | _puts("\n "); |
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401 | _exit(); |
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402 | } |
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403 | } // end switch type |
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404 | } // end loop on vobjs |
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405 | if( !ptab_found ) |
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406 | { |
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407 | _puts("\n[INIT ERROR] Missing PTAB for vspace "); |
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408 | _putw( vspace_id ); |
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409 | _exit(); |
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410 | } |
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411 | } // end loop on vspaces |
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412 | |
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413 | _puts("\n[INIT] Vobjs initialisation completed at cycle : "); |
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414 | _putw( _proctime() ); |
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415 | _puts("\n"); |
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416 | |
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417 | } // end _vobjs_init() |
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418 | |
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419 | /////////////////////////////////////////////////////////////////////////////// |
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420 | // This function initialises all task contexts and processors schedulers. |
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421 | // It sets the default values for all schedulers (tasks <= 0, current <= 0). |
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422 | // Finally, it scan all tasks in all vspaces to initialise the schedulers, |
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423 | // and the tasks contexts, as defined in the mapping_info data structure. |
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424 | // A global TTY index and a global FB channel are allocated if required. |
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425 | // TTY[0] is reserved for the kernel. |
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426 | /////////////////////////////////////////////////////////////////////////////// |
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427 | in_kinit void _kernel_tasks_init(unsigned int* ptabs) |
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428 | { |
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429 | mapping_header_t* header = (mapping_header_t*)&seg_mapping_base; |
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430 | mapping_cluster_t* cluster = _get_cluster_base( header ); |
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431 | mapping_vspace_t* vspace = _get_vspace_base( header ); |
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432 | mapping_task_t* task = _get_task_base( header ); |
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433 | |
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434 | unsigned int base_tty_id = 1; // TTY index allocator |
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435 | unsigned int base_fb_id = 0; // FB channel index allocator |
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436 | |
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437 | unsigned int cluster_id; |
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438 | unsigned int proc_id; |
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439 | unsigned int vspace_id; |
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440 | unsigned int task_id; |
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441 | |
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442 | // initialise the schedulers (not done by the compiler) |
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443 | for ( cluster_id = 0 ; cluster_id < header->clusters ; cluster_id++ ) |
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444 | { |
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445 | for ( proc_id = 0 ; proc_id < cluster[cluster_id].procs ; proc_id++ ) |
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446 | { |
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447 | if ( proc_id >= NB_PROCS ) |
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448 | { |
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449 | _puts("\n[INIT ERROR] The number of processors in cluster "); |
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450 | _putw( cluster_id ); |
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451 | _puts(" is larger than NB_PROCS \n"); |
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452 | _exit(); |
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453 | } |
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454 | _scheduler[cluster_id*NB_PROCS+proc_id].tasks = 0; |
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455 | _scheduler[cluster_id*NB_PROCS+proc_id].current = 0; |
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456 | } |
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457 | } |
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458 | |
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459 | // loop on the virtual spaces |
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460 | for ( vspace_id = 0 ; vspace_id < header->vspaces ; vspace_id++ ) |
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461 | { |
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462 | |
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463 | #if INIT_DEBUG |
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464 | _puts("\n[INIT] mapping tasks in vspace "); |
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465 | _puts(vspace[vspace_id].name); |
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466 | _puts("\n"); |
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467 | #endif |
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468 | // loop on the tasks |
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469 | for ( task_id = vspace[vspace_id].task_offset ; |
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470 | task_id < (vspace[vspace_id].task_offset + vspace[vspace_id].tasks) ; |
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471 | task_id++ ) |
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472 | { |
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473 | unsigned int tty_id = 0xFFFFFFFF; |
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474 | unsigned int fb_id = 0xFFFFFFFF; |
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475 | if ( task[task_id].use_tty ) |
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476 | { |
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477 | tty_id = base_tty_id; |
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478 | base_tty_id++; |
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479 | } |
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480 | if ( task[task_id].use_fb ) |
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481 | { |
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482 | fb_id = base_fb_id; |
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483 | base_fb_id++; |
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484 | } |
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485 | _task_map( task_id, // global task index |
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486 | vspace_id, // vspace index |
---|
487 | tty_id, // global tty index |
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488 | fb_id, // global fbdma index |
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489 | ptabs[vspace_id] ); // page table pointer |
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490 | } // end loop on tasks |
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491 | } // end oop on vspaces |
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492 | |
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493 | _puts("\n[INIT] Task Contexts initialisation completed at cycle "); |
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494 | _putw( _proctime() ); |
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495 | _puts("\n"); |
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496 | |
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497 | #if INIT_DEBUG |
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498 | for ( cluster_id = 0 ; cluster_id < header->clusters ; cluster_id++ ) |
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499 | { |
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500 | _puts("\nCluster "); |
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501 | _putw( cluster_id ); |
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502 | _puts("\n"); |
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503 | for ( proc_id = 0 ; proc_id < cluster[cluster_id].procs ; proc_id++ ) |
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504 | { |
---|
505 | unsigned int ltid; // local task index |
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506 | unsigned int gtid; // global task index |
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507 | unsigned int pid = cluster_id * NB_PROCS + proc_id; |
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508 | |
---|
509 | _puts(" - processor "); |
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510 | _putw( pid ); |
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511 | _puts("\n"); |
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512 | for ( ltid = 0 ; ltid < _scheduler[pid].tasks ; ltid++ ) |
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513 | { |
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514 | gtid = _scheduler[pid].context[ltid][CTX_TASK_ID]; |
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515 | _puts(" task : "); |
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516 | _puts( task[gtid].name ); |
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517 | _puts("\n"); |
---|
518 | } |
---|
519 | } |
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520 | } |
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521 | #endif |
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522 | |
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523 | } // end _kernel_task_init() |
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524 | |
---|
525 | //////////////////////////////////////////////////////////////////////////////// |
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526 | // This function intializes the external periherals such as the IOB component |
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527 | // (I/O bridge, containing the IOMMU, the IOC (external disk controller), |
---|
528 | // the NIC (external network controller), the FBDMA (frame buffer controller), |
---|
529 | //////////////////////////////////////////////////////////////////////////////// |
---|
530 | in_kinit void _kernel_peripherals_init() |
---|
531 | { |
---|
532 | // IOC peripheral initialisation |
---|
533 | // we simply activate the IOC interrupts... |
---|
534 | unsigned int* ioc_address = (unsigned int*)&seg_ioc_base; |
---|
535 | |
---|
536 | ioc_address[BLOCK_DEVICE_IRQ_ENABLE] = 1; |
---|
537 | |
---|
538 | // IOB peripheral |
---|
539 | if ( GIET_IOMMU_ACTIVE ) |
---|
540 | { |
---|
541 | unsigned int* iob_address = (unsigned int*)&seg_iob_base; |
---|
542 | unsigned int icu_address = (unsigned int)&seg_icu_base; |
---|
543 | |
---|
544 | // define IPI address mapping the IOC interrupt ...TODO... |
---|
545 | |
---|
546 | // set IOMMU page table address |
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547 | iob_address[IOB_IOMMU_PTPR] = (unsigned int)(&_iommu_ptab); |
---|
548 | |
---|
549 | // activate IOMMU |
---|
550 | iob_address[IOB_IOMMU_ACTIVE] = 1; |
---|
551 | } |
---|
552 | |
---|
553 | _puts("\n[INIT] Peripherals initialisation completed at cycle "); |
---|
554 | _putw( _proctime() ); |
---|
555 | _puts("\n"); |
---|
556 | |
---|
557 | } // end _kernel_peripherals_init() |
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558 | |
---|
559 | //////////////////////////////////////////////////////////////////////////////// |
---|
560 | // This function intialises the interrupt vector, and initialises |
---|
561 | // the ICU mask registers for all processors in all clusters. |
---|
562 | // It strongly depends on the actual peripheral hardware wiring. |
---|
563 | // In this peculiar version, all clusters are identical, |
---|
564 | // the number of processors per cluster cannot be larger than 8. |
---|
565 | // Processor 0 handle all interrupts corresponding to TTYs, DMAs and IOC |
---|
566 | // (ICU inputs from from IRQ[8] to IRQ[31]). Only the 8 TIMER interrupts |
---|
567 | // (ICU iputs IRQ[0] to IRQ[7]), that are used for context switching |
---|
568 | // are distributed to the 8 processors. |
---|
569 | //////////////////////////////////////////////////////////////////////////////// |
---|
570 | in_kinit void _kernel_interrupt_vector_init() |
---|
571 | { |
---|
572 | mapping_header_t* header = (mapping_header_t*)&seg_mapping_base; |
---|
573 | mapping_cluster_t* cluster = _get_cluster_base( header ); |
---|
574 | |
---|
575 | unsigned int cluster_id; |
---|
576 | unsigned int proc_id; |
---|
577 | |
---|
578 | // ICU mask values (up to 8 processors per cluster) |
---|
579 | unsigned int icu_mask[8] = { 0xFFFFFF01, |
---|
580 | 0x00000002, |
---|
581 | 0x00000004, |
---|
582 | 0x00000008, |
---|
583 | 0x00000010, |
---|
584 | 0x00000020, |
---|
585 | 0x00000040, |
---|
586 | 0x00000080 }; |
---|
587 | |
---|
588 | // initialise ICUs for each processor in each cluster |
---|
589 | for ( cluster_id = 0 ; cluster_id < header->clusters ; cluster_id++ ) |
---|
590 | { |
---|
591 | for ( proc_id = 0 ; proc_id < cluster[cluster_id].procs ; proc_id++ ) |
---|
592 | { |
---|
593 | _icu_write( cluster_id, proc_id, ICU_MASK_SET, icu_mask[proc_id] ); |
---|
594 | } |
---|
595 | } |
---|
596 | |
---|
597 | // initialize Interrupt vector |
---|
598 | |
---|
599 | _interrupt_vector[0] = &_isr_switch; |
---|
600 | _interrupt_vector[1] = &_isr_switch; |
---|
601 | _interrupt_vector[2] = &_isr_switch; |
---|
602 | _interrupt_vector[3] = &_isr_switch; |
---|
603 | _interrupt_vector[4] = &_isr_switch; |
---|
604 | _interrupt_vector[5] = &_isr_switch; |
---|
605 | _interrupt_vector[6] = &_isr_switch; |
---|
606 | _interrupt_vector[7] = &_isr_switch; |
---|
607 | |
---|
608 | _interrupt_vector[8] = &_isr_dma_0; |
---|
609 | _interrupt_vector[9] = &_isr_dma_1; |
---|
610 | _interrupt_vector[10] = &_isr_dma_2; |
---|
611 | _interrupt_vector[11] = &_isr_dma_3; |
---|
612 | _interrupt_vector[12] = &_isr_dma_4; |
---|
613 | _interrupt_vector[13] = &_isr_dma_5; |
---|
614 | _interrupt_vector[14] = &_isr_dma_6; |
---|
615 | _interrupt_vector[15] = &_isr_dma_7; |
---|
616 | |
---|
617 | _interrupt_vector[16] = &_isr_tty_get_0; |
---|
618 | _interrupt_vector[17] = &_isr_tty_get_1; |
---|
619 | _interrupt_vector[18] = &_isr_tty_get_2; |
---|
620 | _interrupt_vector[19] = &_isr_tty_get_3; |
---|
621 | _interrupt_vector[20] = &_isr_tty_get_4; |
---|
622 | _interrupt_vector[21] = &_isr_tty_get_5; |
---|
623 | _interrupt_vector[22] = &_isr_tty_get_6; |
---|
624 | _interrupt_vector[23] = &_isr_tty_get_7; |
---|
625 | _interrupt_vector[24] = &_isr_tty_get_8; |
---|
626 | _interrupt_vector[25] = &_isr_tty_get_9; |
---|
627 | _interrupt_vector[26] = &_isr_tty_get_10; |
---|
628 | _interrupt_vector[27] = &_isr_tty_get_11; |
---|
629 | _interrupt_vector[28] = &_isr_tty_get_12; |
---|
630 | _interrupt_vector[29] = &_isr_tty_get_13; |
---|
631 | _interrupt_vector[30] = &_isr_tty_get_14; |
---|
632 | |
---|
633 | _interrupt_vector[31] = &_isr_ioc; |
---|
634 | |
---|
635 | _puts("\n[INIT] Interrupt vector initialisation completed at cycle "); |
---|
636 | _putw( _proctime() ); |
---|
637 | _puts("\n"); |
---|
638 | |
---|
639 | } // end _kernel_interrup_vector_init() |
---|