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 server implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009, 2010 |
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11 | * embedded brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * <rtems@embedded-brains.de> |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.com/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #include <stdlib.h> |
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23 | |
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24 | #include <rtems.h> |
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25 | #include <rtems/chain.h> |
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26 | |
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27 | #include <bsp/irq-generic.h> |
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28 | |
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29 | #define BSP_INTERRUPT_EVENT RTEMS_EVENT_13 |
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30 | |
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31 | typedef struct bsp_interrupt_server_entry { |
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32 | rtems_chain_node node; |
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33 | rtems_vector_number vector; |
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34 | rtems_interrupt_handler handler; |
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35 | void *arg; |
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36 | } bsp_interrupt_server_entry; |
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37 | |
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38 | static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE; |
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39 | |
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40 | static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain); |
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41 | |
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42 | static rtems_status_code bsp_interrupt_server_is_initialized(void) |
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43 | { |
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44 | if (bsp_interrupt_server_id != RTEMS_ID_NONE) { |
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45 | return RTEMS_SUCCESSFUL; |
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46 | } else { |
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47 | return RTEMS_INCORRECT_STATE; |
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48 | } |
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49 | } |
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50 | |
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51 | static unsigned bsp_interrupt_server_errors; |
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52 | |
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53 | static void bsp_interrupt_server_trigger(void *arg) |
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54 | { |
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55 | bsp_interrupt_server_entry *e = arg; |
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56 | |
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57 | bsp_interrupt_vector_disable(e->vector); |
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58 | |
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59 | if (e->node.next == NULL) { |
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60 | rtems_chain_append(&bsp_interrupt_server_chain, &e->node); |
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61 | } else { |
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62 | ++bsp_interrupt_server_errors; |
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63 | } |
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64 | |
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65 | rtems_event_send(bsp_interrupt_server_id, BSP_INTERRUPT_EVENT); |
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66 | } |
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67 | |
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68 | static bsp_interrupt_server_entry *bsp_interrupt_server_get_entry(void) |
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69 | { |
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70 | rtems_interrupt_level level; |
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71 | bsp_interrupt_server_entry *e; |
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72 | |
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73 | rtems_interrupt_disable(level); |
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74 | e = (bsp_interrupt_server_entry *) |
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75 | rtems_chain_get_unprotected(&bsp_interrupt_server_chain); |
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76 | if (e != NULL) { |
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77 | e->node.next = NULL; |
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78 | } |
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79 | rtems_interrupt_enable(level); |
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80 | |
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81 | return e; |
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82 | } |
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83 | |
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84 | static void bsp_interrupt_server_task(rtems_task_argument arg) |
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85 | { |
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86 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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87 | |
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88 | while (true) { |
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89 | rtems_event_set events = 0; |
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90 | bsp_interrupt_server_entry *e = NULL; |
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91 | |
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92 | sc = rtems_event_receive( |
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93 | BSP_INTERRUPT_EVENT, |
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94 | RTEMS_EVENT_ALL | RTEMS_WAIT, |
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95 | RTEMS_NO_TIMEOUT, |
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96 | &events |
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97 | ); |
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98 | if (sc != RTEMS_SUCCESSFUL) { |
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99 | break; |
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100 | } |
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101 | |
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102 | while ((e = bsp_interrupt_server_get_entry()) != NULL) { |
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103 | (*e->handler)(e->arg); |
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104 | |
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105 | bsp_interrupt_vector_enable(e->vector); |
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106 | } |
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107 | } |
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108 | |
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109 | rtems_task_delete(RTEMS_SELF); |
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110 | } |
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111 | |
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112 | typedef struct { |
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113 | rtems_interrupt_handler handler; |
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114 | void *arg; |
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115 | bsp_interrupt_server_entry *entry; |
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116 | } bsp_interrupt_server_iterate_entry; |
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117 | |
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118 | static void bsp_interrupt_server_per_handler_routine( |
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119 | void *iterate_arg, |
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120 | const char *info, |
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121 | rtems_option options, |
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122 | rtems_interrupt_handler handler, |
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123 | void *handler_arg |
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124 | ) |
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125 | { |
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126 | bsp_interrupt_server_iterate_entry *ie = iterate_arg; |
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127 | bsp_interrupt_server_entry *e = handler_arg; |
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128 | |
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129 | if (handler == bsp_interrupt_server_trigger) { |
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130 | if (e->handler == ie->handler && e->arg == ie->arg) { |
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131 | ie->entry = e; |
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132 | } |
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133 | } |
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134 | } |
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135 | |
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136 | rtems_status_code rtems_interrupt_server_handler_install( |
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137 | rtems_id server, |
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138 | rtems_vector_number vector, |
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139 | const char *info, |
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140 | rtems_option options, |
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141 | rtems_interrupt_handler handler, |
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142 | void *arg |
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143 | ) |
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144 | { |
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145 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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146 | bsp_interrupt_server_entry *e = NULL; |
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147 | |
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148 | sc = bsp_interrupt_server_is_initialized(); |
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149 | if (sc != RTEMS_SUCCESSFUL) { |
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150 | return sc; |
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151 | } |
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152 | |
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153 | if (server != RTEMS_ID_NONE) { |
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154 | return RTEMS_NOT_IMPLEMENTED; |
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155 | } |
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156 | |
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157 | if (RTEMS_INTERRUPT_IS_SHARED(options)) { |
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158 | return RTEMS_NOT_IMPLEMENTED; |
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159 | } |
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160 | |
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161 | e = calloc(1, sizeof(*e)); |
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162 | if (e == NULL) { |
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163 | return RTEMS_NO_MEMORY; |
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164 | } |
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165 | |
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166 | e->vector = vector; |
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167 | e->handler = handler; |
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168 | e->arg = arg; |
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169 | |
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170 | sc = rtems_interrupt_handler_install( |
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171 | vector, |
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172 | info, |
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173 | options, |
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174 | bsp_interrupt_server_trigger, |
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175 | e |
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176 | ); |
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177 | if (sc != RTEMS_SUCCESSFUL) { |
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178 | free(e); |
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179 | |
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180 | return sc; |
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181 | } |
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182 | |
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183 | return RTEMS_SUCCESSFUL; |
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184 | } |
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185 | |
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186 | rtems_status_code rtems_interrupt_server_handler_remove( |
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187 | rtems_id server, |
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188 | rtems_vector_number vector, |
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189 | rtems_interrupt_handler handler, |
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190 | void *arg |
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191 | ) |
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192 | { |
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193 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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194 | bsp_interrupt_server_iterate_entry ie = { |
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195 | .handler = handler, |
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196 | .arg = arg, |
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197 | .entry = NULL |
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198 | }; |
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199 | |
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200 | sc = bsp_interrupt_server_is_initialized(); |
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201 | if (sc != RTEMS_SUCCESSFUL) { |
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202 | return sc; |
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203 | } |
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204 | |
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205 | if (server != RTEMS_ID_NONE) { |
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206 | return RTEMS_NOT_IMPLEMENTED; |
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207 | } |
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208 | |
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209 | /* Query corresponding interrupt server entry */ |
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210 | sc = rtems_interrupt_handler_iterate( |
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211 | vector, |
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212 | bsp_interrupt_server_per_handler_routine, |
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213 | &ie |
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214 | ); |
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215 | if (sc != RTEMS_SUCCESSFUL) { |
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216 | return sc; |
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217 | } else if (ie.entry == NULL) { |
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218 | return RTEMS_INVALID_ID; |
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219 | } |
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220 | |
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221 | sc = rtems_interrupt_handler_remove( |
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222 | vector, |
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223 | ie.entry->handler, |
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224 | ie.entry->arg |
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225 | ); |
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226 | if (sc != RTEMS_SUCCESSFUL) { |
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227 | return sc; |
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228 | } |
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229 | |
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230 | free(ie.entry); |
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231 | |
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232 | return RTEMS_SUCCESSFUL; |
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233 | } |
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234 | |
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235 | rtems_status_code rtems_interrupt_server_initialize( |
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236 | rtems_task_priority priority, |
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237 | size_t stack_size, |
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238 | rtems_mode modes, |
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239 | rtems_attribute attributes, |
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240 | rtems_id *server |
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241 | ) |
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242 | { |
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243 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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244 | |
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245 | if (server != NULL) { |
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246 | return RTEMS_NOT_IMPLEMENTED; |
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247 | } |
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248 | |
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249 | sc = rtems_task_create( |
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250 | rtems_build_name('I', 'R', 'Q', 'S'), |
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251 | priority, |
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252 | stack_size, |
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253 | modes, |
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254 | attributes, |
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255 | &bsp_interrupt_server_id |
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256 | ); |
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257 | if (sc != RTEMS_SUCCESSFUL) { |
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258 | return RTEMS_TOO_MANY; |
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259 | } |
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260 | |
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261 | sc = rtems_task_start( |
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262 | bsp_interrupt_server_id, |
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263 | bsp_interrupt_server_task, |
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264 | 0 |
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265 | ); |
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266 | if (sc != RTEMS_SUCCESSFUL) { |
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267 | /* In this case we could also panic */ |
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268 | rtems_task_delete(bsp_interrupt_server_id); |
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269 | bsp_interrupt_server_id = RTEMS_ID_NONE; |
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270 | |
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271 | return RTEMS_TOO_MANY; |
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272 | } |
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273 | |
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274 | return RTEMS_SUCCESSFUL; |
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275 | } |
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