1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup arm_start |
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5 | * |
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6 | * @brief ARM system low level start. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2008-2013 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #ifndef LIBBSP_ARM_SHARED_START_H |
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18 | #define LIBBSP_ARM_SHARED_START_H |
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19 | |
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20 | #include <string.h> |
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21 | |
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22 | #include <bsp/linker-symbols.h> |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif /* __cplusplus */ |
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27 | |
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28 | /** |
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29 | * @defgroup arm_start System Start |
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30 | * |
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31 | * @ingroup RTEMSBSPsARMShared |
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32 | * |
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33 | * @brief ARM system low level start. |
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34 | * |
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35 | * @{ |
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36 | */ |
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37 | |
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38 | #define BSP_START_TEXT_SECTION __attribute__((section(".bsp_start_text"))) |
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39 | |
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40 | #define BSP_START_DATA_SECTION __attribute__((section(".bsp_start_data"))) |
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41 | |
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42 | /** |
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43 | * @brief System start entry. |
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44 | */ |
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45 | void _start(void); |
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46 | |
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47 | /** |
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48 | * @brief Start entry hook 0. |
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49 | * |
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50 | * This hook will be called from the start entry code after all modes and |
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51 | * stack pointers are initialized but before the copying of the exception |
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52 | * vectors. |
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53 | */ |
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54 | void bsp_start_hook_0(void); |
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55 | |
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56 | /** |
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57 | * @brief Start entry hook 1. |
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58 | * |
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59 | * This hook will be called from the start entry code after copying of the |
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60 | * exception vectors but before the call to boot_card(). |
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61 | */ |
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62 | void bsp_start_hook_1(void); |
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63 | |
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64 | /** |
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65 | * @brief Similar to standard memcpy(). |
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66 | * |
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67 | * The memory areas must be word aligned. Copy code will be executed from the |
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68 | * stack. If @a dest equals @a src nothing will be copied. |
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69 | */ |
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70 | void bsp_start_memcpy(int *dest, const int *src, size_t n); |
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71 | |
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72 | /** |
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73 | * @brief ARM entry point to bsp_start_memcpy(). |
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74 | */ |
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75 | void bsp_start_memcpy_arm(int *dest, const int *src, size_t n); |
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76 | |
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77 | /** |
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78 | * @brief Copies all standard sections from the load to the runtime area. |
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79 | */ |
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80 | BSP_START_TEXT_SECTION static inline void bsp_start_copy_sections(void) |
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81 | { |
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82 | /* Copy .text section */ |
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83 | bsp_start_memcpy( |
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84 | (int *) bsp_section_text_begin, |
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85 | (const int *) bsp_section_text_load_begin, |
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86 | (size_t) bsp_section_text_size |
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87 | ); |
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88 | |
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89 | /* Copy .rodata section */ |
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90 | bsp_start_memcpy( |
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91 | (int *) bsp_section_rodata_begin, |
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92 | (const int *) bsp_section_rodata_load_begin, |
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93 | (size_t) bsp_section_rodata_size |
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94 | ); |
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95 | |
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96 | /* Copy .data section */ |
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97 | bsp_start_memcpy( |
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98 | (int *) bsp_section_data_begin, |
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99 | (const int *) bsp_section_data_load_begin, |
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100 | (size_t) bsp_section_data_size |
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101 | ); |
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102 | |
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103 | /* Copy .fast_text section */ |
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104 | bsp_start_memcpy( |
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105 | (int *) bsp_section_fast_text_begin, |
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106 | (const int *) bsp_section_fast_text_load_begin, |
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107 | (size_t) bsp_section_fast_text_size |
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108 | ); |
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109 | |
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110 | /* Copy .fast_data section */ |
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111 | bsp_start_memcpy( |
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112 | (int *) bsp_section_fast_data_begin, |
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113 | (const int *) bsp_section_fast_data_load_begin, |
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114 | (size_t) bsp_section_fast_data_size |
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115 | ); |
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116 | } |
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117 | |
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118 | BSP_START_TEXT_SECTION static inline void |
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119 | bsp_start_memcpy_libc(void *dest, const void *src, size_t n) |
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120 | { |
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121 | if (dest != src) { |
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122 | memcpy(dest, src, n); |
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123 | } |
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124 | } |
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125 | |
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126 | /** |
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127 | * @brief Copies the .data, .fast_text and .fast_data sections from the load to |
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128 | * the runtime area using the C library memcpy(). |
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129 | * |
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130 | * Works only in case the .start, .text and .rodata sections reside in one |
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131 | * memory region. |
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132 | */ |
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133 | BSP_START_TEXT_SECTION static inline void bsp_start_copy_sections_compact(void) |
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134 | { |
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135 | /* Copy .data section */ |
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136 | bsp_start_memcpy_libc( |
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137 | bsp_section_data_begin, |
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138 | bsp_section_data_load_begin, |
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139 | (size_t) bsp_section_data_size |
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140 | ); |
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141 | |
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142 | /* Copy .fast_text section */ |
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143 | bsp_start_memcpy_libc( |
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144 | bsp_section_fast_text_begin, |
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145 | bsp_section_fast_text_load_begin, |
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146 | (size_t) bsp_section_fast_text_size |
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147 | ); |
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148 | |
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149 | /* Copy .fast_data section */ |
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150 | bsp_start_memcpy_libc( |
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151 | bsp_section_fast_data_begin, |
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152 | bsp_section_fast_data_load_begin, |
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153 | (size_t) bsp_section_fast_data_size |
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154 | ); |
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155 | } |
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156 | |
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157 | BSP_START_TEXT_SECTION static inline void bsp_start_clear_bss(void) |
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158 | { |
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159 | memset(bsp_section_bss_begin, 0, (size_t) bsp_section_bss_size); |
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160 | } |
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161 | |
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162 | /** @} */ |
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163 | |
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164 | #ifdef __cplusplus |
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165 | } |
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166 | #endif /* __cplusplus */ |
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167 | |
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168 | #endif /* LIBBSP_ARM_SHARED_START_H */ |
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