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 Generic BSP interrupt support implementation. |
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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, 2009 |
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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 |
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20 | * found in the file LICENSE in this distribution or at |
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21 | * http://www.rtems.com/license/LICENSE. |
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22 | */ |
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23 | |
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24 | #include <stdlib.h> |
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25 | |
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26 | #include <bsp/irq-generic.h> |
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27 | |
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28 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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29 | bsp_interrupt_handler_index_type bsp_interrupt_handler_index_table |
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30 | [BSP_INTERRUPT_VECTOR_NUMBER]; |
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31 | #endif |
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32 | |
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33 | bsp_interrupt_handler_entry bsp_interrupt_handler_table |
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34 | [BSP_INTERRUPT_HANDLER_TABLE_SIZE]; |
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35 | |
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36 | /* The last entry indicates if everything is initialized */ |
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37 | static uint8_t bsp_interrupt_handler_unique_table |
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38 | [(BSP_INTERRUPT_HANDLER_TABLE_SIZE + 7 + 1) / 8]; |
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39 | |
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40 | static rtems_id bsp_interrupt_mutex = RTEMS_ID_NONE; |
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41 | |
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42 | static void bsp_interrupt_handler_empty(rtems_vector_number vector, void *arg) |
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43 | { |
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44 | bsp_interrupt_handler_default(vector); |
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45 | } |
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46 | |
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47 | static inline bool bsp_interrupt_is_handler_unique(rtems_vector_number index) |
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48 | { |
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49 | rtems_vector_number i = index / 8; |
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50 | rtems_vector_number s = index % 8; |
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51 | return (bsp_interrupt_handler_unique_table [i] >> s) & 0x1; |
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52 | } |
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53 | |
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54 | static inline void bsp_interrupt_set_handler_unique( |
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55 | rtems_vector_number index, |
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56 | bool unique |
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57 | ) |
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58 | { |
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59 | rtems_vector_number i = index / 8; |
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60 | rtems_vector_number s = index % 8; |
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61 | if (unique) { |
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62 | bsp_interrupt_handler_unique_table [i] |= (uint8_t) (0x1U << s); |
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63 | } else { |
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64 | bsp_interrupt_handler_unique_table [i] &= (uint8_t) ~(0x1U << s); |
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65 | } |
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66 | } |
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67 | |
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68 | static inline bool bsp_interrupt_is_initialized(void) |
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69 | { |
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70 | return bsp_interrupt_is_handler_unique(BSP_INTERRUPT_HANDLER_TABLE_SIZE); |
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71 | } |
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72 | |
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73 | static inline void bsp_interrupt_set_initialized(void) |
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74 | { |
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75 | bsp_interrupt_set_handler_unique(BSP_INTERRUPT_HANDLER_TABLE_SIZE, true); |
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76 | } |
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77 | |
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78 | static inline bool bsp_interrupt_is_empty_handler_entry( |
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79 | bsp_interrupt_handler_entry *e |
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80 | ) |
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81 | { |
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82 | return e->handler == bsp_interrupt_handler_empty; |
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83 | } |
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84 | |
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85 | static inline void bsp_interrupt_clear_handler_entry( |
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86 | bsp_interrupt_handler_entry *e |
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87 | ) |
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88 | { |
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89 | e->handler = bsp_interrupt_handler_empty; |
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90 | e->arg = NULL; |
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91 | e->info = NULL; |
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92 | e->next = NULL; |
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93 | } |
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94 | |
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95 | static inline bool bsp_interrupt_allocate_handler_index( |
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96 | rtems_vector_number vector, |
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97 | rtems_vector_number *index |
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98 | ) |
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99 | { |
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100 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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101 | rtems_vector_number i = 0; |
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102 | |
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103 | /* The first entry will remain empty */ |
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104 | for (i = 1; i < BSP_INTERRUPT_HANDLER_TABLE_SIZE; ++i) { |
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105 | const bsp_interrupt_handler_entry *e = &bsp_interrupt_handler_table [i]; |
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106 | if (bsp_interrupt_is_empty_handler_entry(e)) { |
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107 | *index = i; |
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108 | return true; |
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109 | } |
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110 | } |
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111 | |
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112 | return false; |
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113 | #else |
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114 | *index = vector; |
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115 | return true; |
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116 | #endif |
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117 | } |
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118 | |
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119 | static bsp_interrupt_handler_entry *bsp_interrupt_allocate_handler_entry(void) |
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120 | { |
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121 | #ifdef BSP_INTERRUPT_NO_HEAP_USAGE |
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122 | rtems_vector_number index = 0; |
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123 | if (bsp_interrupt_allocate_handler_index(0, &index)) { |
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124 | return &bsp_interrupt_handler_table [index]; |
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125 | } else { |
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126 | return NULL; |
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127 | } |
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128 | #else |
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129 | return malloc(sizeof(bsp_interrupt_handler_entry)); |
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130 | #endif |
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131 | } |
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132 | |
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133 | static void bsp_interrupt_free_handler_entry(bsp_interrupt_handler_entry *e) |
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134 | { |
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135 | #ifdef BSP_INTERRUPT_NO_HEAP_USAGE |
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136 | bsp_interrupt_clear_handler_entry(e); |
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137 | #else |
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138 | free(e); |
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139 | #endif |
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140 | } |
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141 | |
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142 | static rtems_status_code bsp_interrupt_lock(void) |
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143 | { |
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144 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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145 | if (_System_state_Is_up(_System_state_Get())) { |
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146 | if (bsp_interrupt_mutex == RTEMS_ID_NONE) { |
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147 | rtems_id mutex = RTEMS_ID_NONE; |
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148 | rtems_interrupt_level level; |
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149 | |
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150 | /* Create a mutex */ |
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151 | sc = rtems_semaphore_create ( |
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152 | rtems_build_name('I', 'N', 'T', 'R'), |
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153 | 1, |
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154 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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155 | 0, |
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156 | &mutex |
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157 | ); |
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158 | if (sc != RTEMS_SUCCESSFUL) { |
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159 | return sc; |
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160 | } |
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161 | |
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162 | /* Assign the mutex */ |
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163 | rtems_interrupt_disable(level); |
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164 | if (bsp_interrupt_mutex == RTEMS_ID_NONE) { |
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165 | /* Nobody else assigned the mutex in the meantime */ |
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166 | |
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167 | bsp_interrupt_mutex = mutex; |
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168 | rtems_interrupt_enable(level); |
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169 | } else { |
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170 | /* Somebody else won */ |
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171 | |
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172 | rtems_interrupt_enable(level); |
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173 | sc = rtems_semaphore_delete(mutex); |
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174 | if (sc != RTEMS_SUCCESSFUL) { |
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175 | return sc; |
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176 | } |
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177 | } |
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178 | } |
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179 | return rtems_semaphore_obtain( |
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180 | bsp_interrupt_mutex, |
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181 | RTEMS_WAIT, |
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182 | RTEMS_NO_TIMEOUT |
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183 | ); |
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184 | } else { |
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185 | return RTEMS_SUCCESSFUL; |
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186 | } |
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187 | } |
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188 | |
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189 | static rtems_status_code bsp_interrupt_unlock(void) |
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190 | { |
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191 | if (bsp_interrupt_mutex != RTEMS_ID_NONE) { |
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192 | return rtems_semaphore_release(bsp_interrupt_mutex); |
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193 | } else { |
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194 | return RTEMS_SUCCESSFUL; |
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195 | } |
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196 | } |
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197 | |
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198 | rtems_status_code bsp_interrupt_initialize(void) |
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199 | { |
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200 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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201 | size_t i = 0; |
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202 | |
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203 | sc = bsp_interrupt_lock(); |
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204 | if (sc != RTEMS_SUCCESSFUL) { |
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205 | return sc; |
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206 | } |
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207 | |
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208 | /* We need one semaphore */ |
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209 | if (_System_state_Is_before_initialization(_System_state_Get())) { |
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210 | Configuration.work_space_size += sizeof(Semaphore_Control); |
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211 | ++Configuration_RTEMS_API.maximum_semaphores; |
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212 | } |
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213 | |
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214 | if (bsp_interrupt_is_initialized()) { |
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215 | bsp_interrupt_unlock(); |
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216 | return RTEMS_INTERNAL_ERROR; |
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217 | } |
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218 | |
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219 | /* Initialize handler table */ |
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220 | for (i = 0; i < BSP_INTERRUPT_HANDLER_TABLE_SIZE; ++i) { |
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221 | bsp_interrupt_handler_table [i].handler = bsp_interrupt_handler_empty; |
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222 | } |
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223 | |
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224 | sc = bsp_interrupt_facility_initialize(); |
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225 | if (sc != RTEMS_SUCCESSFUL) { |
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226 | bsp_interrupt_unlock(); |
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227 | return sc; |
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228 | } |
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229 | |
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230 | bsp_interrupt_set_initialized(); |
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231 | |
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232 | sc = bsp_interrupt_unlock(); |
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233 | if (sc != RTEMS_SUCCESSFUL) { |
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234 | return sc; |
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235 | } |
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236 | |
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237 | return RTEMS_SUCCESSFUL; |
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238 | } |
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239 | |
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240 | /** |
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241 | * @brief Installs an interrupt handler. |
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242 | * |
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243 | * @ingroup bsp_interrupt |
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244 | * |
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245 | * @return In addition to the standard status codes this function returns: |
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246 | * - If the BSP interrupt support is not initialized RTEMS_INTERNAL_ERROR will |
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247 | * be returned. |
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248 | * - If not enough memory for a new handler is available RTEMS_NO_MEMORY will |
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249 | * be returned |
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250 | * |
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251 | * @see rtems_interrupt_handler_install() |
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252 | */ |
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253 | static rtems_status_code bsp_interrupt_handler_install( |
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254 | rtems_vector_number vector, |
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255 | const char *info, |
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256 | rtems_option options, |
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257 | rtems_interrupt_handler handler, |
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258 | void *arg |
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259 | ) |
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260 | { |
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261 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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262 | rtems_interrupt_level level; |
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263 | rtems_vector_number index = 0; |
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264 | bsp_interrupt_handler_entry *head = NULL; |
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265 | bsp_interrupt_handler_entry *tail = NULL; |
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266 | bsp_interrupt_handler_entry *current = NULL; |
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267 | bsp_interrupt_handler_entry *match = NULL; |
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268 | bool enable_vector = false; |
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269 | |
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270 | /* Check parameters and system state */ |
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271 | if (!bsp_interrupt_is_initialized()) { |
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272 | return RTEMS_INTERNAL_ERROR; |
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273 | } else if (!bsp_interrupt_is_valid_vector(vector)) { |
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274 | return RTEMS_INVALID_ID; |
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275 | } else if (handler == NULL) { |
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276 | return RTEMS_INVALID_ADDRESS; |
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277 | } else if (rtems_interrupt_is_in_progress()) { |
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278 | return RTEMS_CALLED_FROM_ISR; |
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279 | } |
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280 | |
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281 | /* Lock */ |
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282 | sc = bsp_interrupt_lock(); |
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283 | if (sc != RTEMS_SUCCESSFUL) { |
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284 | return sc; |
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285 | } |
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286 | |
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287 | /* Get handler table index */ |
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288 | index = bsp_interrupt_handler_index(vector); |
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289 | |
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290 | /* Get head entry of the handler list for current vector */ |
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291 | head = &bsp_interrupt_handler_table [index]; |
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292 | |
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293 | if (bsp_interrupt_is_empty_handler_entry(head)) { |
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294 | /* |
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295 | * No real handler installed yet. So allocate a new index in |
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296 | * the handler table and fill the entry with life. |
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297 | */ |
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298 | if (bsp_interrupt_allocate_handler_index(vector, &index)) { |
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299 | rtems_interrupt_disable(level); |
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300 | bsp_interrupt_handler_table [index].handler = handler; |
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301 | bsp_interrupt_handler_table [index].arg = arg; |
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302 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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303 | bsp_interrupt_handler_index_table [vector] = index; |
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304 | #endif |
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305 | rtems_interrupt_enable(level); |
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306 | bsp_interrupt_handler_table [index].info = info; |
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307 | } else { |
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308 | /* Handler table is full */ |
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309 | bsp_interrupt_unlock(); |
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310 | return RTEMS_NO_MEMORY; |
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311 | } |
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312 | |
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313 | /* This is the first handler so enable the vector later */ |
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314 | enable_vector = true; |
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315 | } else { |
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316 | /* Ensure that a unique handler remains unique */ |
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317 | if ( |
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318 | RTEMS_INTERRUPT_IS_UNIQUE(options) |
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319 | || bsp_interrupt_is_handler_unique(index) |
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320 | ) { |
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321 | /* |
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322 | * Tried to install a unique handler on a not empty |
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323 | * list or there is already a unique handler installed. |
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324 | */ |
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325 | bsp_interrupt_unlock(); |
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326 | return RTEMS_RESOURCE_IN_USE; |
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327 | } |
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328 | |
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329 | /* |
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330 | * Search for the list tail and check if the handler is already |
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331 | * installed. |
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332 | */ |
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333 | current = head; |
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334 | do { |
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335 | if (current->handler == handler && current->arg == arg) { |
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336 | match = current; |
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337 | } |
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338 | tail = current; |
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339 | current = current->next; |
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340 | } while (current != NULL); |
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341 | |
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342 | /* Ensure the handler is not already installed */ |
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343 | if (match != NULL) { |
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344 | /* The handler is already installed */ |
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345 | bsp_interrupt_unlock(); |
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346 | return RTEMS_TOO_MANY; |
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347 | } |
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348 | |
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349 | /* Allocate a new entry */ |
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350 | current = bsp_interrupt_allocate_handler_entry(); |
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351 | if (current == NULL) { |
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352 | /* Not enough memory */ |
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353 | bsp_interrupt_unlock(); |
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354 | return RTEMS_NO_MEMORY; |
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355 | } |
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356 | |
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357 | /* Set entry */ |
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358 | current->handler = handler; |
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359 | current->arg = arg; |
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360 | current->info = info; |
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361 | current->next = NULL; |
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362 | |
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363 | /* Link to list tail */ |
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364 | rtems_interrupt_disable(level); |
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365 | tail->next = current; |
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366 | rtems_interrupt_enable(level); |
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367 | } |
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368 | |
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369 | /* Make the handler unique if necessary */ |
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370 | bsp_interrupt_set_handler_unique(index, RTEMS_INTERRUPT_IS_UNIQUE(options)); |
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371 | |
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372 | /* Enable the vector if necessary */ |
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373 | if (enable_vector) { |
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374 | sc = bsp_interrupt_vector_enable(vector); |
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375 | if (sc != RTEMS_SUCCESSFUL) { |
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376 | bsp_interrupt_unlock(); |
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377 | return sc; |
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378 | } |
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379 | } |
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380 | |
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381 | /* Unlock */ |
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382 | sc = bsp_interrupt_unlock(); |
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383 | if (sc != RTEMS_SUCCESSFUL) { |
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384 | return sc; |
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385 | } |
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386 | |
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387 | return RTEMS_SUCCESSFUL; |
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388 | } |
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389 | |
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390 | /** |
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391 | * @brief Removes an interrupt handler. |
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392 | * |
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393 | * @ingroup bsp_interrupt |
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394 | * |
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395 | * @return In addition to the standard status codes this function returns |
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396 | * RTEMS_INTERNAL_ERROR if the BSP interrupt support is not initialized. |
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397 | * |
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398 | * @see rtems_interrupt_handler_remove(). |
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399 | */ |
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400 | static rtems_status_code bsp_interrupt_handler_remove( |
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401 | rtems_vector_number vector, |
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402 | rtems_interrupt_handler handler, |
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403 | void *arg |
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404 | ) |
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405 | { |
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406 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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407 | rtems_interrupt_level level; |
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408 | rtems_vector_number index = 0; |
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409 | bsp_interrupt_handler_entry *head = NULL; |
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410 | bsp_interrupt_handler_entry *current = NULL; |
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411 | bsp_interrupt_handler_entry *previous = NULL; |
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412 | bsp_interrupt_handler_entry *match = NULL; |
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413 | |
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414 | /* Check parameters and system state */ |
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415 | if (!bsp_interrupt_is_initialized()) { |
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416 | return RTEMS_INTERNAL_ERROR; |
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417 | } else if (!bsp_interrupt_is_valid_vector(vector)) { |
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418 | return RTEMS_INVALID_ID; |
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419 | } else if (handler == NULL) { |
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420 | return RTEMS_INVALID_ADDRESS; |
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421 | } else if (rtems_interrupt_is_in_progress()) { |
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422 | return RTEMS_CALLED_FROM_ISR; |
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423 | } |
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424 | |
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425 | /* Lock */ |
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426 | sc = bsp_interrupt_lock(); |
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427 | if (sc != RTEMS_SUCCESSFUL) { |
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428 | return sc; |
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429 | } |
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430 | |
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431 | /* Get handler table index */ |
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432 | index = bsp_interrupt_handler_index(vector); |
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433 | |
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434 | /* Get head entry of the handler list for current vector */ |
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435 | head = &bsp_interrupt_handler_table [index]; |
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436 | |
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437 | /* Search for a matching entry */ |
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438 | current = head; |
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439 | do { |
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440 | if (current->handler == handler && current->arg == arg) { |
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441 | match = current; |
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442 | break; |
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443 | } |
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444 | previous = current; |
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445 | current = current->next; |
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446 | } while (current != NULL); |
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447 | |
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448 | /* Remove the matching entry */ |
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449 | if (match != NULL) { |
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450 | if (match->next != NULL) { |
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451 | /* |
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452 | * The match has a successor. A successor is always |
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453 | * allocated. So replace the match with its successor |
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454 | * and free the successor entry. |
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455 | */ |
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456 | current = match->next; |
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457 | |
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458 | rtems_interrupt_disable(level); |
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459 | *match = *current; |
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460 | rtems_interrupt_enable(level); |
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461 | |
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462 | bsp_interrupt_free_handler_entry(current); |
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463 | } else if (match == head) { |
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464 | /* |
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465 | * The match is the list head and has no successor. |
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466 | * The list head is stored in a static table so clear |
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467 | * this entry. Since now the list is empty disable the |
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468 | * vector. |
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469 | */ |
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470 | |
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471 | /* Disable the vector */ |
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472 | sc = bsp_interrupt_vector_disable(vector); |
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473 | |
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474 | /* Clear entry */ |
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475 | rtems_interrupt_disable(level); |
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476 | bsp_interrupt_clear_handler_entry(head); |
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477 | #ifdef BSP_INTERRUPT_USE_INDEX_TABLE |
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478 | bsp_interrupt_handler_index_table [vector] = 0; |
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479 | #endif |
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480 | rtems_interrupt_enable(level); |
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481 | |
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482 | /* Allow shared handlers */ |
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483 | bsp_interrupt_set_handler_unique(index, false); |
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484 | |
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485 | /* Check status code */ |
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486 | if (sc != RTEMS_SUCCESSFUL) { |
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487 | bsp_interrupt_unlock(); |
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488 | return sc; |
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489 | } |
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490 | } else { |
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491 | /* |
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492 | * The match is the list tail and has a predecessor. |
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493 | * So terminate the predecessor and free the match. |
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494 | */ |
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495 | rtems_interrupt_disable(level); |
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496 | previous->next = NULL; |
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497 | rtems_interrupt_enable(level); |
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498 | |
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499 | bsp_interrupt_free_handler_entry(match); |
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500 | } |
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501 | } else { |
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502 | /* No matching entry found */ |
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503 | bsp_interrupt_unlock(); |
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504 | return RTEMS_UNSATISFIED; |
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505 | } |
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506 | |
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507 | /* Unlock */ |
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508 | sc = bsp_interrupt_unlock(); |
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509 | if (sc != RTEMS_SUCCESSFUL) { |
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510 | return sc; |
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511 | } |
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512 | |
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513 | return RTEMS_SUCCESSFUL; |
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514 | } |
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515 | |
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516 | /** |
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517 | * @brief Iterates over all installed interrupt handler of a vector. |
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518 | * |
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519 | * @ingroup bsp_interrupt |
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520 | * |
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521 | * @return In addition to the standard status codes this function returns |
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522 | * RTEMS_INTERNAL_ERROR if the BSP interrupt support is not initialized. |
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523 | * |
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524 | * @see rtems_interrupt_handler_iterate(). |
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525 | */ |
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526 | static rtems_status_code bsp_interrupt_handler_iterate( |
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527 | rtems_vector_number vector, |
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528 | rtems_interrupt_per_handler_routine routine, |
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529 | void *arg |
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530 | ) |
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531 | { |
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532 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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533 | bsp_interrupt_handler_entry *current = NULL; |
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534 | rtems_option options = 0; |
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535 | rtems_vector_number index = 0; |
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536 | |
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537 | /* Check parameters and system state */ |
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538 | if (!bsp_interrupt_is_initialized()) { |
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539 | return RTEMS_INTERNAL_ERROR; |
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540 | } else if (!bsp_interrupt_is_valid_vector(vector)) { |
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541 | return RTEMS_INVALID_ID; |
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542 | } else if (rtems_interrupt_is_in_progress()) { |
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543 | return RTEMS_CALLED_FROM_ISR; |
---|
544 | } |
---|
545 | |
---|
546 | /* Lock */ |
---|
547 | sc = bsp_interrupt_lock(); |
---|
548 | if (sc != RTEMS_SUCCESSFUL) { |
---|
549 | return sc; |
---|
550 | } |
---|
551 | |
---|
552 | /* Interate */ |
---|
553 | index = bsp_interrupt_handler_index(vector); |
---|
554 | current = &bsp_interrupt_handler_table [index]; |
---|
555 | if (!bsp_interrupt_is_empty_handler_entry(current)) { |
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556 | do { |
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557 | options = bsp_interrupt_is_handler_unique(index) ? |
---|
558 | RTEMS_INTERRUPT_UNIQUE : RTEMS_INTERRUPT_SHARED; |
---|
559 | routine(arg, current->info, options, current->handler, current->arg); |
---|
560 | current = current->next; |
---|
561 | } while (current != NULL); |
---|
562 | } |
---|
563 | |
---|
564 | /* Unlock */ |
---|
565 | sc = bsp_interrupt_unlock(); |
---|
566 | if (sc != RTEMS_SUCCESSFUL) { |
---|
567 | return sc; |
---|
568 | } |
---|
569 | |
---|
570 | return RTEMS_SUCCESSFUL; |
---|
571 | } |
---|
572 | |
---|
573 | rtems_status_code rtems_interrupt_handler_install( |
---|
574 | rtems_vector_number vector, |
---|
575 | const char *info, |
---|
576 | rtems_option options, |
---|
577 | rtems_interrupt_handler handler, |
---|
578 | void *arg |
---|
579 | ) |
---|
580 | { |
---|
581 | return bsp_interrupt_handler_install(vector, info, options, handler, arg); |
---|
582 | } |
---|
583 | |
---|
584 | rtems_status_code rtems_interrupt_handler_remove( |
---|
585 | rtems_vector_number vector, |
---|
586 | rtems_interrupt_handler handler, |
---|
587 | void *arg |
---|
588 | ) |
---|
589 | { |
---|
590 | return bsp_interrupt_handler_remove(vector, handler, arg); |
---|
591 | } |
---|
592 | |
---|
593 | rtems_status_code rtems_interrupt_handler_iterate( |
---|
594 | rtems_vector_number vector, |
---|
595 | rtems_interrupt_per_handler_routine routine, |
---|
596 | void *arg |
---|
597 | ) |
---|
598 | { |
---|
599 | return bsp_interrupt_handler_iterate(vector, routine, arg); |
---|
600 | } |
---|