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, 2016 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #include <stdlib.h> |
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24 | |
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25 | #include <rtems.h> |
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26 | #include <rtems/chain.h> |
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27 | #include <rtems/score/assert.h> |
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28 | |
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29 | #include <bsp/irq-generic.h> |
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30 | |
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31 | RTEMS_INTERRUPT_LOCK_DEFINE( |
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32 | static, |
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33 | bsp_interrupt_server_lock, |
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34 | "Interrupt Server" |
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35 | ) |
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36 | |
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37 | typedef struct bsp_interrupt_server_action { |
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38 | struct bsp_interrupt_server_action *next; |
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39 | rtems_interrupt_handler handler; |
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40 | void *arg; |
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41 | } bsp_interrupt_server_action; |
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42 | |
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43 | typedef struct { |
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44 | rtems_chain_node node; |
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45 | rtems_vector_number vector; |
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46 | bsp_interrupt_server_action *actions; |
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47 | } bsp_interrupt_server_entry; |
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48 | |
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49 | static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE; |
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50 | |
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51 | static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain); |
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52 | |
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53 | static rtems_status_code bsp_interrupt_server_is_initialized(void) |
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54 | { |
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55 | if (bsp_interrupt_server_id != RTEMS_ID_NONE) { |
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56 | return RTEMS_SUCCESSFUL; |
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57 | } else { |
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58 | return RTEMS_INCORRECT_STATE; |
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59 | } |
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60 | } |
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61 | |
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62 | static unsigned bsp_interrupt_server_errors; |
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63 | |
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64 | static void bsp_interrupt_server_trigger(void *arg) |
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65 | { |
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66 | rtems_interrupt_lock_context lock_context; |
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67 | bsp_interrupt_server_entry *e = arg; |
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68 | |
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69 | bsp_interrupt_vector_disable(e->vector); |
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70 | |
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71 | rtems_interrupt_lock_acquire(&bsp_interrupt_server_lock, &lock_context); |
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72 | |
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73 | if (rtems_chain_is_node_off_chain(&e->node)) { |
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74 | rtems_chain_append_unprotected(&bsp_interrupt_server_chain, &e->node); |
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75 | } else { |
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76 | ++bsp_interrupt_server_errors; |
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77 | } |
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78 | |
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79 | rtems_interrupt_lock_release(&bsp_interrupt_server_lock, &lock_context); |
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80 | |
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81 | rtems_event_system_send(bsp_interrupt_server_id, RTEMS_EVENT_SYSTEM_SERVER); |
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82 | } |
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83 | |
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84 | typedef struct { |
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85 | bsp_interrupt_server_action *action; |
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86 | bsp_interrupt_server_action **link; |
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87 | rtems_id task; |
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88 | } bsp_interrupt_server_helper_data; |
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89 | |
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90 | static void bsp_interrupt_server_helper(void *arg) |
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91 | { |
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92 | bsp_interrupt_server_helper_data *hd = arg; |
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93 | |
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94 | *hd->link = hd->action; |
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95 | rtems_event_transient_send(hd->task); |
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96 | } |
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97 | |
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98 | static void bsp_interrupt_server_call_helper( |
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99 | bsp_interrupt_server_action *action, |
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100 | bsp_interrupt_server_action **link |
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101 | ) |
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102 | { |
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103 | bsp_interrupt_server_helper_data hd = { |
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104 | .action = action, |
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105 | .link = link, |
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106 | .task = rtems_task_self() |
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107 | }; |
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108 | bsp_interrupt_server_action a = { |
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109 | .handler = bsp_interrupt_server_helper, |
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110 | .arg = &hd |
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111 | }; |
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112 | bsp_interrupt_server_entry e = { |
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113 | .vector = BSP_INTERRUPT_VECTOR_MAX + 1, |
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114 | .actions = &a |
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115 | }; |
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116 | |
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117 | bsp_interrupt_server_trigger(&e); |
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118 | rtems_event_transient_receive(RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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119 | } |
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120 | |
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121 | static bsp_interrupt_server_entry *bsp_interrupt_server_get_entry(void) |
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122 | { |
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123 | rtems_interrupt_lock_context lock_context; |
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124 | bsp_interrupt_server_entry *e; |
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125 | rtems_chain_control *chain; |
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126 | |
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127 | rtems_interrupt_lock_acquire(&bsp_interrupt_server_lock, &lock_context); |
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128 | chain = &bsp_interrupt_server_chain; |
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129 | |
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130 | if (!rtems_chain_is_empty(chain)) { |
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131 | e = (bsp_interrupt_server_entry *) |
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132 | rtems_chain_get_first_unprotected(chain); |
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133 | rtems_chain_set_off_chain(&e->node); |
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134 | } else { |
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135 | e = NULL; |
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136 | } |
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137 | |
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138 | rtems_interrupt_lock_release(&bsp_interrupt_server_lock, &lock_context); |
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139 | |
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140 | return e; |
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141 | } |
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142 | |
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143 | static void bsp_interrupt_server_task(rtems_task_argument arg) |
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144 | { |
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145 | while (true) { |
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146 | rtems_event_set events; |
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147 | bsp_interrupt_server_entry *e; |
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148 | |
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149 | rtems_event_system_receive( |
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150 | RTEMS_EVENT_SYSTEM_SERVER, |
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151 | RTEMS_EVENT_ALL | RTEMS_WAIT, |
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152 | RTEMS_NO_TIMEOUT, |
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153 | &events |
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154 | ); |
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155 | |
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156 | while ((e = bsp_interrupt_server_get_entry()) != NULL) { |
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157 | bsp_interrupt_server_action *action = e->actions; |
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158 | rtems_vector_number vector = e->vector; |
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159 | |
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160 | do { |
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161 | bsp_interrupt_server_action *current = action; |
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162 | action = action->next; |
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163 | (*current->handler)(current->arg); |
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164 | } while (action != NULL); |
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165 | |
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166 | bsp_interrupt_vector_enable(vector); |
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167 | } |
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168 | } |
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169 | } |
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170 | |
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171 | typedef struct { |
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172 | bsp_interrupt_server_entry *entry; |
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173 | rtems_option *options; |
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174 | } bsp_interrupt_server_iterate_entry; |
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175 | |
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176 | static void bsp_interrupt_server_per_handler_routine( |
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177 | void *iterate_arg, |
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178 | const char *info, |
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179 | rtems_option options, |
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180 | rtems_interrupt_handler handler, |
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181 | void *handler_arg |
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182 | ) |
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183 | { |
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184 | if (handler == bsp_interrupt_server_trigger) { |
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185 | bsp_interrupt_server_iterate_entry *ie = iterate_arg; |
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186 | |
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187 | ie->entry = handler_arg; |
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188 | *ie->options = options; |
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189 | } |
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190 | } |
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191 | |
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192 | static bsp_interrupt_server_entry *bsp_interrupt_server_query_entry( |
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193 | rtems_vector_number vector, |
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194 | rtems_option *trigger_options |
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195 | ) |
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196 | { |
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197 | bsp_interrupt_server_iterate_entry ie = { |
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198 | .entry = NULL, |
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199 | .options = trigger_options |
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200 | }; |
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201 | |
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202 | rtems_interrupt_handler_iterate( |
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203 | vector, |
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204 | bsp_interrupt_server_per_handler_routine, |
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205 | &ie |
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206 | ); |
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207 | |
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208 | return ie.entry; |
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209 | } |
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210 | |
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211 | rtems_status_code rtems_interrupt_server_handler_install( |
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212 | rtems_id server, |
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213 | rtems_vector_number vector, |
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214 | const char *info, |
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215 | rtems_option options, |
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216 | rtems_interrupt_handler handler, |
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217 | void *arg |
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218 | ) |
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219 | { |
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220 | rtems_status_code sc; |
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221 | bsp_interrupt_server_entry *e; |
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222 | bsp_interrupt_server_action *a; |
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223 | rtems_option trigger_options; |
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224 | |
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225 | sc = bsp_interrupt_server_is_initialized(); |
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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 | if (server != RTEMS_ID_NONE) { |
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231 | return RTEMS_NOT_IMPLEMENTED; |
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232 | } |
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233 | |
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234 | a = calloc(1, sizeof(*a)); |
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235 | if (a == NULL) { |
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236 | return RTEMS_NO_MEMORY; |
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237 | } |
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238 | |
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239 | a->handler = handler; |
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240 | a->arg = arg; |
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241 | |
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242 | bsp_interrupt_lock(); |
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243 | |
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244 | e = bsp_interrupt_server_query_entry(vector, &trigger_options); |
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245 | if (e == NULL) { |
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246 | e = calloc(1, sizeof(*e)); |
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247 | if (e != NULL) { |
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248 | e->vector = vector; |
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249 | e->actions = a; |
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250 | |
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251 | sc = rtems_interrupt_handler_install( |
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252 | vector, |
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253 | "IRQS", |
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254 | options & RTEMS_INTERRUPT_UNIQUE, |
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255 | bsp_interrupt_server_trigger, |
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256 | e |
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257 | ); |
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258 | if (sc != RTEMS_SUCCESSFUL) { |
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259 | free(e); |
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260 | } |
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261 | } else { |
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262 | sc = RTEMS_NO_MEMORY; |
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263 | } |
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264 | } else if ( |
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265 | RTEMS_INTERRUPT_IS_UNIQUE(options) |
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266 | || RTEMS_INTERRUPT_IS_UNIQUE(trigger_options) |
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267 | ) { |
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268 | sc = RTEMS_RESOURCE_IN_USE; |
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269 | } else { |
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270 | bsp_interrupt_server_action **link = &e->actions; |
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271 | bsp_interrupt_server_action *c; |
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272 | |
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273 | while ((c = *link) != NULL) { |
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274 | if (c->handler == handler && c->arg == arg) { |
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275 | sc = RTEMS_TOO_MANY; |
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276 | break; |
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277 | } |
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278 | |
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279 | link = &c->next; |
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280 | } |
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281 | |
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282 | if (sc == RTEMS_SUCCESSFUL) { |
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283 | bsp_interrupt_server_call_helper(a, link); |
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284 | } |
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285 | } |
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286 | |
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287 | bsp_interrupt_unlock(); |
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288 | |
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289 | if (sc != RTEMS_SUCCESSFUL) { |
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290 | free(a); |
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291 | } |
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292 | |
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293 | return sc; |
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294 | } |
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295 | |
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296 | rtems_status_code rtems_interrupt_server_handler_remove( |
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297 | rtems_id server, |
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298 | rtems_vector_number vector, |
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299 | rtems_interrupt_handler handler, |
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300 | void *arg |
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301 | ) |
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302 | { |
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303 | rtems_status_code sc; |
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304 | bsp_interrupt_server_entry *e; |
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305 | rtems_option trigger_options; |
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306 | |
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307 | sc = bsp_interrupt_server_is_initialized(); |
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308 | if (sc != RTEMS_SUCCESSFUL) { |
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309 | return sc; |
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310 | } |
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311 | |
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312 | if (server != RTEMS_ID_NONE) { |
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313 | return RTEMS_NOT_IMPLEMENTED; |
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314 | } |
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315 | |
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316 | bsp_interrupt_lock(); |
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317 | |
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318 | e = bsp_interrupt_server_query_entry(vector, &trigger_options); |
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319 | if (e != NULL) { |
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320 | bsp_interrupt_server_action **link = &e->actions; |
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321 | bsp_interrupt_server_action *c; |
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322 | |
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323 | while ((c = *link) != NULL) { |
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324 | if (c->handler == handler && c->arg == arg) { |
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325 | break; |
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326 | } |
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327 | |
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328 | link = &c->next; |
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329 | } |
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330 | |
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331 | if (c != NULL) { |
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332 | bool remove_last = e->actions->next == NULL; |
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333 | |
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334 | if (remove_last) { |
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335 | rtems_interrupt_handler_remove( |
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336 | vector, |
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337 | bsp_interrupt_server_trigger, |
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338 | e |
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339 | ); |
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340 | } |
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341 | |
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342 | bsp_interrupt_server_call_helper(c->next, link); |
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343 | free(c); |
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344 | |
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345 | if (remove_last) { |
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346 | free(e); |
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347 | } |
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348 | } else { |
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349 | sc = RTEMS_UNSATISFIED; |
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350 | } |
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351 | } else { |
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352 | sc = RTEMS_INVALID_ID; |
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353 | } |
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354 | |
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355 | bsp_interrupt_unlock(); |
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356 | |
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357 | return sc; |
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358 | } |
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359 | |
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360 | rtems_status_code rtems_interrupt_server_initialize( |
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361 | rtems_task_priority priority, |
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362 | size_t stack_size, |
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363 | rtems_mode modes, |
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364 | rtems_attribute attributes, |
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365 | rtems_id *server |
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366 | ) |
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367 | { |
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368 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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369 | |
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370 | if (server != NULL) { |
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371 | return RTEMS_NOT_IMPLEMENTED; |
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372 | } |
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373 | |
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374 | sc = rtems_task_create( |
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375 | rtems_build_name('I', 'R', 'Q', 'S'), |
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376 | priority, |
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377 | stack_size, |
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378 | modes, |
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379 | attributes, |
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380 | &bsp_interrupt_server_id |
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381 | ); |
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382 | if (sc != RTEMS_SUCCESSFUL) { |
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383 | return RTEMS_TOO_MANY; |
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384 | } |
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385 | |
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386 | sc = rtems_task_start( |
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387 | bsp_interrupt_server_id, |
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388 | bsp_interrupt_server_task, |
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389 | 0 |
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390 | ); |
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391 | _Assert(sc == RTEMS_SUCCESSFUL); |
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392 | |
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393 | return RTEMS_SUCCESSFUL; |
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394 | } |
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