1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup bsp_interrupt |
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5 | * |
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6 | * @brief Source file for generic BSP interrupt support. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Based on concepts of Pavel Pisa, Till Straumann and Eric Valette. |
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11 | * |
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12 | * Copyright (c) 2008 |
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13 | * Embedded Brains GmbH |
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14 | * Obere Lagerstr. 30 |
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15 | * D-82178 Puchheim |
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16 | * Germany |
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17 | * rtems@embedded-brains.de |
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18 | * |
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19 | * The license and distribution terms for this file may be found in the file |
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20 | * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #include <bsp/irq-generic.h> |
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24 | |
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25 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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26 | bsp_interrupt_handler_index_type bsp_interrupt_handler_index_table [BSP_INTERRUPT_VECTOR_NUMBER]; |
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27 | #endif /* BSP_INTERRUPT_USE_INDEX_TABLE */ |
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28 | |
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29 | bsp_interrupt_handler_entry bsp_interrupt_handler_table [BSP_INTERRUPT_HANDLER_TABLE_SIZE] = { |
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30 | [0 ... BSP_INTERRUPT_HANDLER_TABLE_SIZE - 1] = { |
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31 | .handler = bsp_interrupt_handler_empty, |
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32 | .arg = NULL, |
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33 | .info = NULL, |
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34 | .next = NULL |
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35 | } |
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36 | }; |
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37 | |
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38 | /* The last entry indicates if everything is initialized */ |
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39 | static uint8_t bsp_interrupt_handler_unique_table [(BSP_INTERRUPT_HANDLER_TABLE_SIZE + 7 + 1) / 8]; |
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40 | |
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41 | static rtems_id bsp_interrupt_mutex = RTEMS_ID_NONE; |
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42 | |
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43 | static inline bool bsp_interrupt_is_handler_unique( rtems_vector_number index) |
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44 | { |
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45 | rtems_vector_number i = index / 8; |
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46 | rtems_vector_number s = index % 8; |
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47 | return (bsp_interrupt_handler_unique_table [i] >> s) & 0x1; |
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48 | } |
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49 | |
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50 | static inline void bsp_interrupt_set_handler_unique( rtems_vector_number index, bool unique) |
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51 | { |
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52 | rtems_vector_number i = index / 8; |
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53 | rtems_vector_number s = index % 8; |
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54 | if (unique) { |
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55 | bsp_interrupt_handler_unique_table [i] |= (uint8_t) (0x1U << s); |
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56 | } else { |
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57 | bsp_interrupt_handler_unique_table [i] &= (uint8_t) ~(0x1U << s); |
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58 | } |
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59 | } |
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60 | |
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61 | static inline bool bsp_interrupt_is_initialized(void) |
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62 | { |
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63 | return bsp_interrupt_is_handler_unique( BSP_INTERRUPT_HANDLER_TABLE_SIZE); |
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64 | } |
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65 | |
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66 | static inline void bsp_interrupt_set_initialized(void) |
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67 | { |
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68 | bsp_interrupt_set_handler_unique( BSP_INTERRUPT_HANDLER_TABLE_SIZE, true); |
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69 | } |
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70 | |
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71 | void bsp_interrupt_handler_empty( rtems_vector_number vector, void *arg) |
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72 | { |
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73 | /* Do nothing */ |
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74 | } |
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75 | |
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76 | static inline void bsp_interrupt_clear_handler_entry( bsp_interrupt_handler_entry *e) |
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77 | { |
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78 | e->handler = bsp_interrupt_handler_empty; |
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79 | e->arg = NULL; |
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80 | e->info = NULL; |
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81 | e->next = NULL; |
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82 | } |
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83 | |
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84 | static inline bool bsp_interrupt_allocate_handler_index( rtems_vector_number vector, rtems_vector_number *index) |
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85 | { |
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86 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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87 | rtems_vector_number i = 0; |
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88 | |
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89 | /* The first entry will remain empty */ |
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90 | for (i = 1; i < BSP_INTERRUPT_HANDLER_TABLE_SIZE; ++i) { |
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91 | if (bsp_interrupt_is_empty_handler_entry( &bsp_interrupt_handler_table [i])) { |
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92 | *index = i; |
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93 | return 1; |
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94 | } |
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95 | } |
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96 | |
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97 | return 0; |
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98 | #else /* BSP_INTERRUPT_USE_INDEX_TABLE */ |
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99 | *index = vector; |
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100 | return 1; |
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101 | #endif /* BSP_INTERRUPT_USE_INDEX_TABLE */ |
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102 | } |
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103 | |
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104 | static bsp_interrupt_handler_entry *bsp_interrupt_allocate_handler_entry() |
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105 | { |
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106 | #ifdef BSP_INTERRUPT_NO_HEAP_USAGE |
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107 | rtems_vector_number index = 0; |
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108 | if (bsp_interrupt_allocate_handler_index( 0, &index)) { |
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109 | return &bsp_interrupt_handler_table [index]; |
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110 | } else { |
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111 | return NULL; |
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112 | } |
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113 | #else /* BSP_INTERRUPT_NO_HEAP_USAGE */ |
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114 | return malloc( sizeof( bsp_interrupt_handler_entry)); |
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115 | #endif /* BSP_INTERRUPT_NO_HEAP_USAGE */ |
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116 | } |
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117 | |
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118 | static void bsp_interrupt_free_handler_entry( bsp_interrupt_handler_entry *e) |
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119 | { |
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120 | #ifdef BSP_INTERRUPT_NO_HEAP_USAGE |
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121 | bsp_interrupt_clear_handler_entry( e); |
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122 | #else /* BSP_INTERRUPT_NO_HEAP_USAGE */ |
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123 | free( e); |
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124 | #endif /* BSP_INTERRUPT_NO_HEAP_USAGE */ |
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125 | } |
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126 | |
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127 | static rtems_status_code bsp_interrupt_lock() |
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128 | { |
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129 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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130 | if (_System_state_Is_up( _System_state_Get())) { |
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131 | if (bsp_interrupt_mutex == RTEMS_ID_NONE) { |
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132 | rtems_id mutex = RTEMS_ID_NONE; |
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133 | rtems_interrupt_level level; |
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134 | |
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135 | /* Create a mutex */ |
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136 | sc = rtems_semaphore_create ( |
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137 | rtems_build_name( 'I', 'N', 'T', 'R'), |
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138 | 1, |
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139 | RTEMS_SIMPLE_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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140 | RTEMS_NO_PRIORITY, |
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141 | &mutex |
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142 | ); |
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143 | if (sc != RTEMS_SUCCESSFUL) { |
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144 | return sc; |
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145 | } |
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146 | |
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147 | /* Assign the mutex */ |
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148 | rtems_interrupt_disable( level); |
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149 | if (bsp_interrupt_mutex == RTEMS_ID_NONE) { |
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150 | /* Nobody else assigned the mutex in the meantime */ |
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151 | |
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152 | bsp_interrupt_mutex = mutex; |
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153 | rtems_interrupt_enable( level); |
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154 | } else { |
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155 | /* Somebody else won */ |
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156 | |
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157 | rtems_interrupt_enable( level); |
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158 | sc = rtems_semaphore_delete( mutex); |
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159 | if (sc != RTEMS_SUCCESSFUL) { |
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160 | return sc; |
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161 | } |
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162 | } |
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163 | } |
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164 | return rtems_semaphore_obtain( bsp_interrupt_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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165 | } else { |
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166 | return RTEMS_SUCCESSFUL; |
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167 | } |
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168 | } |
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169 | |
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170 | static rtems_status_code bsp_interrupt_unlock() |
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171 | { |
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172 | if (bsp_interrupt_mutex != RTEMS_ID_NONE) { |
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173 | return rtems_semaphore_release( bsp_interrupt_mutex); |
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174 | } else { |
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175 | return RTEMS_SUCCESSFUL; |
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176 | } |
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177 | } |
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178 | |
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179 | /** |
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180 | * @brief Initialize BSP interrupt support. |
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181 | * |
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182 | * You must call this function before you can install, remove and dispatch |
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183 | * interrupt handlers. The BSP specific bsp_interrupt_facility_initialize() |
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184 | * function will be called after all internals are initialized. Initialization |
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185 | * is complete if everything was successful. |
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186 | */ |
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187 | rtems_status_code bsp_interrupt_initialize() |
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188 | { |
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189 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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190 | rtems_vector_number index = 0; |
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191 | |
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192 | /* Lock */ |
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193 | sc = bsp_interrupt_lock(); |
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194 | if (sc != RTEMS_SUCCESSFUL) { |
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195 | return sc; |
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196 | } |
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197 | |
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198 | /* Check if already initialized */ |
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199 | if (bsp_interrupt_is_initialized()) { |
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200 | bsp_interrupt_unlock(); |
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201 | return RTEMS_INTERNAL_ERROR; |
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202 | } |
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203 | |
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204 | /* BSP specific initialization */ |
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205 | sc = bsp_interrupt_facility_initialize(); |
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206 | if (sc != RTEMS_SUCCESSFUL) { |
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207 | bsp_interrupt_unlock(); |
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208 | return sc; |
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209 | } |
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210 | |
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211 | /* Now we are initialized */ |
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212 | bsp_interrupt_set_initialized(); |
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213 | |
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214 | /* Unlock */ |
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215 | sc = bsp_interrupt_unlock(); |
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216 | if (sc != RTEMS_SUCCESSFUL) { |
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217 | return sc; |
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218 | } |
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219 | |
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220 | return RTEMS_SUCCESSFUL; |
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221 | } |
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222 | |
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223 | /** |
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224 | * @brief Installs an interrupt handler. |
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225 | * |
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226 | * @ingroup bsp_interrupt |
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227 | * |
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228 | * @return In addition to the standard status codes this function returns: |
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229 | * - If the BSP interrupt support is not initialized RTEMS_INTERNAL_ERROR will |
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230 | * be returned. |
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231 | * - If not enough memory for a new handler is available RTEMS_NO_MEMORY will |
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232 | * be returned |
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233 | * |
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234 | * @see rtems_interrupt_handler_install() |
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235 | */ |
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236 | static rtems_status_code bsp_interrupt_handler_install( rtems_vector_number vector, const char *info, rtems_option options, rtems_interrupt_handler handler, void *arg) |
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237 | { |
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238 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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239 | rtems_interrupt_level level; |
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240 | rtems_vector_number index = 0; |
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241 | bsp_interrupt_handler_entry *head = NULL; |
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242 | bsp_interrupt_handler_entry *tail = NULL; |
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243 | bsp_interrupt_handler_entry *current = NULL; |
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244 | bsp_interrupt_handler_entry *match = NULL; |
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245 | bool enable_vector = false; |
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246 | |
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247 | /* Check parameters and system state */ |
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248 | if (!bsp_interrupt_is_initialized()) { |
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249 | return RTEMS_INTERNAL_ERROR; |
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250 | } else if (!bsp_interrupt_is_valid_vector( vector)) { |
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251 | return RTEMS_INVALID_NUMBER; |
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252 | } else if (handler == NULL) { |
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253 | return RTEMS_INVALID_ADDRESS; |
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254 | } else if (rtems_interrupt_is_in_progress()) { |
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255 | return RTEMS_CALLED_FROM_ISR; |
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256 | } |
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257 | |
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258 | /* Lock */ |
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259 | sc = bsp_interrupt_lock(); |
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260 | if (sc != RTEMS_SUCCESSFUL) { |
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261 | return sc; |
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262 | } |
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263 | |
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264 | /* Get handler table index */ |
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265 | index = bsp_interrupt_handler_index( vector); |
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266 | |
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267 | /* Get head entry of the handler list for current vector */ |
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268 | head = &bsp_interrupt_handler_table [index]; |
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269 | |
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270 | if (bsp_interrupt_is_empty_handler_entry( head)) { |
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271 | /* |
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272 | * No real handler installed yet. So allocate a new index in |
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273 | * the handler table and fill the entry with life. |
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274 | */ |
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275 | if (bsp_interrupt_allocate_handler_index( vector, &index)) { |
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276 | rtems_interrupt_disable( level); |
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277 | bsp_interrupt_handler_table [index].handler = handler; |
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278 | bsp_interrupt_handler_table [index].arg = arg; |
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279 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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280 | bsp_interrupt_handler_index_table [vector] = index; |
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281 | #endif /* BSP_INTERRUPT_USE_INDEX_TABLE */ |
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282 | rtems_interrupt_enable( level); |
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283 | bsp_interrupt_handler_table [index].info = info; |
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284 | } else { |
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285 | /* Handler table is full */ |
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286 | bsp_interrupt_unlock(); |
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287 | return RTEMS_NO_MEMORY; |
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288 | } |
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289 | |
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290 | /* This is the first handler so enable the vector later */ |
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291 | enable_vector = true; |
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292 | } else { |
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293 | /* Ensure that a unique handler remains unique */ |
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294 | if (RTEMS_INTERRUPT_IS_UNIQUE( options) || bsp_interrupt_is_handler_unique( index)) { |
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295 | /* |
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296 | * Tried to install a unique handler on a not empty |
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297 | * list or there is already a unique handler installed. |
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298 | */ |
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299 | bsp_interrupt_unlock(); |
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300 | return RTEMS_RESOURCE_IN_USE; |
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301 | } |
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302 | |
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303 | /* |
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304 | * Search for the list tail and check if the handler is already |
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305 | * installed. |
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306 | */ |
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307 | current = head; |
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308 | do { |
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309 | if (current->handler == handler && current->arg == arg) { |
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310 | match = current; |
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311 | } |
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312 | tail = current; |
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313 | current = current->next; |
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314 | } while (current != NULL); |
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315 | |
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316 | /* Ensure the handler is not already installed */ |
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317 | if (match != NULL) { |
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318 | /* The handler is already installed */ |
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319 | bsp_interrupt_unlock(); |
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320 | return RTEMS_TOO_MANY; |
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321 | } |
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322 | |
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323 | /* Allocate a new entry */ |
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324 | current = bsp_interrupt_allocate_handler_entry(); |
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325 | if (current == NULL) { |
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326 | /* Not enough memory */ |
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327 | bsp_interrupt_unlock(); |
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328 | return RTEMS_NO_MEMORY; |
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329 | } |
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330 | |
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331 | /* Set entry */ |
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332 | current->handler = handler; |
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333 | current->arg = arg; |
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334 | current->info = info; |
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335 | current->next = NULL; |
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336 | |
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337 | /* Link to list tail */ |
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338 | rtems_interrupt_disable( level); |
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339 | tail->next = current; |
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340 | rtems_interrupt_enable( level); |
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341 | } |
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342 | |
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343 | /* Make the handler unique if necessary */ |
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344 | bsp_interrupt_set_handler_unique( index, RTEMS_INTERRUPT_IS_UNIQUE( options)); |
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345 | |
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346 | /* Enable the vector if necessary */ |
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347 | if (enable_vector) { |
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348 | sc = bsp_interrupt_vector_enable( vector); |
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349 | if (sc != RTEMS_SUCCESSFUL) { |
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350 | bsp_interrupt_unlock(); |
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351 | return sc; |
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352 | } |
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353 | } |
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354 | |
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355 | /* Unlock */ |
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356 | sc = bsp_interrupt_unlock(); |
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357 | if (sc != RTEMS_SUCCESSFUL) { |
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358 | return sc; |
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359 | } |
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360 | |
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361 | return RTEMS_SUCCESSFUL; |
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362 | } |
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363 | |
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364 | /** |
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365 | * @brief Removes an interrupt handler. |
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366 | * |
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367 | * @ingroup bsp_interrupt |
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368 | * |
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369 | * @return In addition to the standard status codes this function returns |
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370 | * RTEMS_INTERNAL_ERROR if the BSP interrupt support is not initialized. |
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371 | * |
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372 | * @see rtems_interrupt_handler_remove(). |
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373 | */ |
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374 | static rtems_status_code bsp_interrupt_handler_remove( rtems_vector_number vector, rtems_interrupt_handler handler, void *arg) |
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375 | { |
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376 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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377 | rtems_interrupt_level level; |
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378 | rtems_vector_number index = 0; |
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379 | bsp_interrupt_handler_entry *head = NULL; |
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380 | bsp_interrupt_handler_entry *current = NULL; |
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381 | bsp_interrupt_handler_entry *previous = NULL; |
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382 | bsp_interrupt_handler_entry *match = NULL; |
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383 | |
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384 | /* Check parameters and system state */ |
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385 | if (!bsp_interrupt_is_initialized()) { |
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386 | return RTEMS_INTERNAL_ERROR; |
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387 | } else if (!bsp_interrupt_is_valid_vector( vector)) { |
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388 | return RTEMS_INVALID_NUMBER; |
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389 | } else if (handler == NULL) { |
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390 | return RTEMS_INVALID_ADDRESS; |
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391 | } else if (rtems_interrupt_is_in_progress()) { |
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392 | return RTEMS_CALLED_FROM_ISR; |
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393 | } |
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394 | |
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395 | /* Lock */ |
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396 | sc = bsp_interrupt_lock(); |
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397 | if (sc != RTEMS_SUCCESSFUL) { |
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398 | return sc; |
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399 | } |
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400 | |
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401 | /* Get handler table index */ |
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402 | index = bsp_interrupt_handler_index( vector); |
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403 | |
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404 | /* Get head entry of the handler list for current vector */ |
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405 | head = &bsp_interrupt_handler_table [index]; |
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406 | |
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407 | /* Search for a matching entry */ |
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408 | current = head; |
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409 | do { |
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410 | if (current->handler == handler && current->arg == arg) { |
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411 | match = current; |
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412 | break; |
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413 | } |
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414 | previous = current; |
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415 | current = current->next; |
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416 | } while (current != NULL); |
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417 | |
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418 | /* Remove the matching entry */ |
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419 | if (match != NULL) { |
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420 | if (match->next != NULL) { |
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421 | /* |
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422 | * The match has a successor. A successor is always |
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423 | * allocated. So replace the match with its successor |
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424 | * and free the successor entry. |
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425 | */ |
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426 | current = match->next; |
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427 | |
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428 | rtems_interrupt_disable( level); |
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429 | *match = *current; |
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430 | rtems_interrupt_enable( level); |
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431 | |
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432 | bsp_interrupt_free_handler_entry( current); |
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433 | } else if (match == head) { |
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434 | /* |
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435 | * The match is the list head and has no successor. |
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436 | * The list head is stored in a static table so clear |
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437 | * this entry. Since now the list is empty disable the |
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438 | * vector. |
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439 | */ |
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440 | |
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441 | /* Disable the vector */ |
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442 | sc = bsp_interrupt_vector_disable( vector); |
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443 | |
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444 | /* Clear entry */ |
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445 | rtems_interrupt_disable( level); |
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446 | bsp_interrupt_clear_handler_entry( head); |
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447 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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448 | bsp_interrupt_handler_index_table [vector] = 0; |
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449 | #endif /* BSP_INTERRUPT_USE_INDEX_TABLE */ |
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450 | rtems_interrupt_enable( level); |
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451 | |
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452 | /* Allow shared handlers */ |
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453 | bsp_interrupt_set_handler_unique( index, false); |
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454 | |
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455 | /* Check status code */ |
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456 | if (sc != RTEMS_SUCCESSFUL) { |
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457 | bsp_interrupt_unlock(); |
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458 | return sc; |
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459 | } |
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460 | } else { |
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461 | /* |
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462 | * The match is the list tail and has a predecessor. |
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463 | * So terminate the predecessor and free the match. |
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464 | */ |
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465 | rtems_interrupt_disable( level); |
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466 | previous->next = NULL; |
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467 | rtems_interrupt_enable( level); |
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468 | |
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469 | bsp_interrupt_free_handler_entry( match); |
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470 | } |
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471 | } else { |
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472 | /* No matching entry found */ |
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473 | bsp_interrupt_unlock(); |
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474 | return RTEMS_UNSATISFIED; |
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475 | } |
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476 | |
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477 | /* Unlock */ |
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478 | sc = bsp_interrupt_unlock(); |
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479 | if (sc != RTEMS_SUCCESSFUL) { |
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480 | return sc; |
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481 | } |
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482 | |
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483 | return RTEMS_SUCCESSFUL; |
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484 | } |
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485 | |
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486 | /** |
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487 | * @brief Iterates over all installed interrupt handler of a vector. |
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488 | * |
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489 | * @ingroup bsp_interrupt |
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490 | * |
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491 | * @return In addition to the standard status codes this function returns |
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492 | * RTEMS_INTERNAL_ERROR if the BSP interrupt support is not initialized. |
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493 | * |
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494 | * @see rtems_interrupt_handler_iterate(). |
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495 | */ |
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496 | static rtems_status_code bsp_interrupt_handler_iterate( rtems_vector_number vector, rtems_interrupt_per_handler_routine routine, void *arg) |
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497 | { |
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498 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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499 | bsp_interrupt_handler_entry *current = NULL; |
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500 | rtems_option options = 0; |
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501 | rtems_vector_number index = 0; |
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502 | |
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503 | /* Check parameters and system state */ |
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504 | if (!bsp_interrupt_is_initialized()) { |
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505 | return RTEMS_INTERNAL_ERROR; |
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506 | } else if (!bsp_interrupt_is_valid_vector( vector)) { |
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507 | return RTEMS_INVALID_NUMBER; |
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508 | } else if (rtems_interrupt_is_in_progress()) { |
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509 | return RTEMS_CALLED_FROM_ISR; |
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510 | } |
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511 | |
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512 | /* Lock */ |
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513 | sc = bsp_interrupt_lock(); |
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514 | if (sc != RTEMS_SUCCESSFUL) { |
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515 | return sc; |
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516 | } |
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517 | |
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518 | /* Interate */ |
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519 | index = bsp_interrupt_handler_index( vector); |
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520 | current = &bsp_interrupt_handler_table [index]; |
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521 | if (!bsp_interrupt_is_empty_handler_entry( current)) { |
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522 | do { |
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523 | options = bsp_interrupt_is_handler_unique( index) ? RTEMS_INTERRUPT_UNIQUE : RTEMS_INTERRUPT_SHARED; |
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524 | routine( arg, current->info, options, current->handler, current->arg); |
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525 | current = current->next; |
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526 | } while (current != NULL); |
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527 | } |
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528 | |
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529 | /* Unlock */ |
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530 | sc = bsp_interrupt_unlock(); |
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531 | if (sc != RTEMS_SUCCESSFUL) { |
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532 | return sc; |
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533 | } |
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534 | |
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535 | return RTEMS_SUCCESSFUL; |
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536 | } |
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537 | |
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538 | rtems_status_code rtems_interrupt_handler_install( rtems_vector_number vector, const char *info, rtems_option options, rtems_interrupt_handler handler, void *arg) |
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539 | { |
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540 | return bsp_interrupt_handler_install( vector, info, options, handler, arg); |
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541 | } |
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542 | |
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543 | rtems_status_code rtems_interrupt_handler_remove( rtems_vector_number vector, rtems_interrupt_handler handler, void *arg) |
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544 | { |
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545 | return bsp_interrupt_handler_remove( vector, handler, arg); |
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546 | } |
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547 | |
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548 | rtems_status_code rtems_interrupt_handler_iterate( rtems_vector_number vector, rtems_interrupt_per_handler_routine routine, void *arg) |
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549 | { |
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550 | return bsp_interrupt_handler_iterate( vector, routine, arg); |
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551 | } |
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