1 | /* |
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2 | * This is the C entry point for ALL RTEMS BSPs. It is invoked |
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3 | * from the assembly language initialization file usually called |
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4 | * start.S. It provides the framework for the BSP initialization |
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5 | * sequence. The basic flow of initialization is: |
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6 | * |
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7 | * + start.S: basic CPU setup (stack, zero BSS) |
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8 | * + boot_card |
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9 | * + if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) |
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10 | * - obtain information on BSP memory and allocate RTEMS Workspace |
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11 | * + bspstart.c: bsp_start - more advanced initialization |
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12 | * + rtems_initialize_data_structures |
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13 | * + if defined(BSP_BOOTCARD_HANDLES_RAM_ALLOCATION) |
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14 | * - Allocate memory to C Program Heap |
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15 | * - initialize C Library and C Program Heap |
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16 | * + bsp_pretasking_hook |
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17 | * + if defined(RTEMS_DEBUG) |
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18 | * - rtems_debug_enable( RTEMS_DEBUG_ALL_MASK ); |
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19 | * + rtems_initialize_before_drivers |
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20 | * + bsp_predriver_hook |
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21 | * + rtems_initialize_device_drivers |
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22 | * - all device drivers |
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23 | * + bsp_postdriver_hook |
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24 | * + rtems_initialize_start_multitasking |
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25 | * - 1st task executes C++ global constructors |
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26 | * .... appplication runs ... |
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27 | * - exit |
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28 | * + back to here eventually |
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29 | * + bspclean.c: bsp_cleanup |
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30 | * |
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31 | * This style of initialization ensures that the C++ global |
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32 | * constructors are executed after RTEMS is initialized. |
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33 | * Thanks to Chris Johns <cjohns@plessey.com.au> for the idea |
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34 | * to move C++ global constructors into the first task. |
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35 | * |
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36 | * COPYRIGHT (c) 1989-2008. |
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37 | * On-Line Applications Research Corporation (OAR). |
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38 | * |
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39 | * The license and distribution terms for this file may be |
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40 | * found in the file LICENSE in this distribution or at |
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41 | * http://www.rtems.com/license/LICENSE. |
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42 | * |
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43 | * $Id$ |
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44 | */ |
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45 | |
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46 | #include <rtems.h> |
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47 | |
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48 | #include <bsp/bootcard.h> |
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49 | #include <rtems/bspIo.h> |
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50 | |
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51 | /* |
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52 | * At most a single pointer to the cmdline for those target |
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53 | * short on memory and not supporting a command line. |
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54 | */ |
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55 | const char *bsp_boot_cmdline; |
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56 | |
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57 | /* |
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58 | * Are we using a single heap for the RTEMS Workspace and C Program Heap? |
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59 | */ |
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60 | extern bool rtems_unified_work_area; |
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61 | |
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62 | /* |
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63 | * These are the prototypes and helper routines which are used |
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64 | * when the BSP lets the framework handle RAM allocation between |
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65 | * the RTEMS Workspace and C Program Heap. |
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66 | */ |
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67 | static rtems_status_code bootcard_bsp_libc_helper( |
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68 | void *work_area_start, |
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69 | intptr_t work_area_size, |
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70 | void *heap_start, |
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71 | intptr_t heap_size |
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72 | ) |
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73 | { |
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74 | intptr_t heap_size_default = 0; |
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75 | |
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76 | if ( !rtems_unified_work_area && |
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77 | heap_start == BSP_BOOTCARD_HEAP_USES_WORK_AREA) { |
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78 | /* Place the heap immediately following the work area */ |
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79 | heap_start = work_area_start + rtems_configuration_get_work_space_size(); |
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80 | |
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81 | /* Ensure proper alignement */ |
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82 | if ((uintptr_t) heap_start & (CPU_ALIGNMENT - 1)) { |
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83 | heap_start = (void *) (((uintptr_t) heap_start + CPU_ALIGNMENT) |
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84 | & ~(CPU_ALIGNMENT - 1)); |
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85 | } |
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86 | |
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87 | /* |
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88 | * For the default heap size use the free space from the end of the |
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89 | * work space up to the end of the work area as heap. |
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90 | */ |
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91 | heap_size_default = work_area_size - |
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92 | rtems_configuration_get_work_space_size(); |
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93 | |
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94 | /* Keep it as a multiple of 16 bytes */ |
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95 | heap_size_default &= ~((intptr_t) 0xf); |
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96 | |
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97 | /* Use default heap size if requested */ |
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98 | if (heap_size == BSP_BOOTCARD_HEAP_SIZE_DEFAULT) { |
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99 | heap_size = heap_size_default; |
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100 | } |
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101 | |
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102 | /* Check heap size */ |
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103 | if (heap_size > heap_size_default) { |
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104 | return RTEMS_INVALID_SIZE; |
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105 | } |
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106 | } |
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107 | |
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108 | bsp_libc_init(heap_start, heap_size, 0); |
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109 | |
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110 | return RTEMS_SUCCESSFUL; |
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111 | } |
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112 | |
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113 | /* |
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114 | * This is the initialization framework routine that weaves together |
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115 | * calls to RTEMS and the BSP in the proper sequence to initialize |
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116 | * the system while maximizing shared code and keeping BSP code in C |
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117 | * as much as possible. |
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118 | */ |
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119 | int boot_card( |
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120 | const char *cmdline |
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121 | ) |
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122 | { |
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123 | rtems_interrupt_level bsp_isr_level; |
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124 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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125 | void *work_area_start = NULL; |
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126 | uintptr_t work_area_size = 0; |
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127 | void *heap_start = NULL; |
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128 | uintptr_t heap_size = 0; |
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129 | |
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130 | /* |
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131 | * Special case for PowerPC: The interrupt disable mask is stored in SPRG0. |
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132 | * It must be valid before we can use rtems_interrupt_disable(). |
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133 | */ |
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134 | #ifdef PPC_INTERRUPT_DISABLE_MASK_DEFAULT |
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135 | ppc_interrupt_set_disable_mask( PPC_INTERRUPT_DISABLE_MASK_DEFAULT ); |
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136 | #endif /* PPC_INTERRUPT_DISABLE_MASK_DEFAULT */ |
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137 | |
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138 | /* |
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139 | * Make sure interrupts are disabled. |
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140 | */ |
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141 | rtems_interrupt_disable( bsp_isr_level ); |
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142 | |
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143 | bsp_boot_cmdline = cmdline; |
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144 | |
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145 | /* |
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146 | * Invoke Board Support Package initialization routine written in C. |
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147 | */ |
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148 | bsp_start(); |
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149 | |
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150 | /* |
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151 | * Find out where the block of memory the BSP will use for |
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152 | * the RTEMS Workspace and the C Program Heap is. |
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153 | */ |
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154 | bsp_get_work_area(&work_area_start, &work_area_size, |
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155 | &heap_start, &heap_size); |
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156 | |
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157 | if ( (uint32_t) work_area_size <= (uint32_t) Configuration.work_space_size ) { |
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158 | printk( |
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159 | "bootcard: Work space too big for work area! (0x%08lx > 0x%08lx)\n", |
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160 | (uint32_t)Configuration.work_space_size, |
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161 | (uint32_t)work_area_size |
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162 | ); |
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163 | bsp_cleanup(); |
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164 | return -1; |
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165 | } |
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166 | |
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167 | if ( rtems_unified_work_area ) { |
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168 | Configuration.work_space_start = work_area_start; |
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169 | Configuration.work_space_size = work_area_size; |
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170 | } else { |
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171 | Configuration.work_space_start = (char *) work_area_start; |
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172 | } |
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173 | |
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174 | #if (BSP_DIRTY_MEMORY == 1) |
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175 | memset( work_area_start, 0xCF, work_area_size ); |
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176 | #endif |
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177 | |
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178 | /* |
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179 | * Initialize RTEMS data structures |
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180 | */ |
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181 | rtems_initialize_data_structures(); |
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182 | |
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183 | /* |
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184 | * Initialize the C library for those BSPs using the shared |
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185 | * framework. |
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186 | */ |
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187 | sc = bootcard_bsp_libc_helper( |
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188 | work_area_start, |
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189 | work_area_size, |
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190 | heap_start, |
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191 | heap_size |
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192 | ); |
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193 | if ( sc != RTEMS_SUCCESSFUL ) { |
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194 | printk( "bootcard: Cannot initialize C library!\n"); |
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195 | bsp_cleanup(); |
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196 | return -1; |
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197 | } |
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198 | |
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199 | /* |
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200 | * All BSP to do any required initialization now that RTEMS |
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201 | * data structures are initialized. In older BSPs or those |
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202 | * which do not use the shared framework, this is the typical |
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203 | * time when the C Library is initialized so malloc() |
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204 | * can be called by device drivers. For BSPs using the shared |
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205 | * framework, this routine can be empty. |
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206 | */ |
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207 | bsp_pretasking_hook(); |
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208 | |
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209 | /* |
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210 | * If debug is enabled, then enable all dynamic RTEMS debug |
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211 | * capabilities. |
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212 | * |
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213 | * NOTE: Most debug features are conditionally compiled in |
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214 | * or enabled via configure time plugins. |
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215 | */ |
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216 | #ifdef RTEMS_DEBUG |
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217 | rtems_debug_enable( RTEMS_DEBUG_ALL_MASK ); |
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218 | #endif |
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219 | |
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220 | /* |
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221 | * Let RTEMS perform initialization it requires before drivers |
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222 | * are allowed to be initialized. |
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223 | */ |
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224 | rtems_initialize_before_drivers(); |
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225 | |
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226 | /* |
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227 | * Execute BSP specific pre-driver hook. Drivers haven't gotten |
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228 | * to initialize yet so this is a good chance to initialize |
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229 | * buses, spurious interrupt handlers, etc.. |
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230 | * |
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231 | * NOTE: Many BSPs do not require this handler and use the |
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232 | * shared stub. |
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233 | */ |
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234 | bsp_predriver_hook(); |
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235 | |
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236 | /* |
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237 | * Initialize all device drivers. |
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238 | */ |
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239 | rtems_initialize_device_drivers(); |
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240 | |
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241 | /* |
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242 | * Invoke the postdriver hook. This normally opens /dev/console |
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243 | * for use as stdin, stdout, and stderr. |
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244 | */ |
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245 | bsp_postdriver_hook(); |
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246 | |
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247 | /* |
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248 | * Complete initialization of RTEMS and switch to the first task. |
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249 | * Global C++ constructors will be executed in the context of that task. |
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250 | */ |
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251 | rtems_initialize_start_multitasking(); |
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252 | |
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253 | /*************************************************************** |
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254 | *************************************************************** |
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255 | * APPLICATION RUNS HERE!!! When it shuts down, we return!!! * |
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256 | *************************************************************** |
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257 | *************************************************************** |
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258 | */ |
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259 | |
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260 | /* |
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261 | * Perform any BSP specific shutdown actions which are written in C. |
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262 | */ |
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263 | bsp_cleanup(); |
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264 | |
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265 | /* |
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266 | * Now return to the start code. |
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267 | */ |
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268 | return 0; |
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269 | } |
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