[8634637] | 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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[11d6263b] | 10 | * Copyright (c) 2009, 2010 |
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[8634637] | 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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[11d6263b] | 24 | #include <rtems.h> |
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| 25 | #include <rtems/chain.h> |
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| 26 | |
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[8634637] | 27 | #include <bsp/irq-generic.h> |
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| 28 | |
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[11d6263b] | 29 | #define BSP_INTERRUPT_EVENT RTEMS_EVENT_13 |
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| 30 | |
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[8634637] | 31 | typedef struct bsp_interrupt_server_entry { |
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[11d6263b] | 32 | rtems_chain_node node; |
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[8634637] | 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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[11d6263b] | 38 | static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE; |
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[8634637] | 39 | |
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[11d6263b] | 40 | static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain); |
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[8634637] | 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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[11d6263b] | 44 | if (bsp_interrupt_server_id != RTEMS_ID_NONE) { |
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[8634637] | 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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[11d6263b] | 51 | static unsigned bsp_interrupt_server_errors; |
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| 52 | |
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[27de3942] | 53 | static void bsp_interrupt_server_trigger(void *arg) |
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[8634637] | 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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[11d6263b] | 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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[8634637] | 73 | rtems_interrupt_disable(level); |
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[11d6263b] | 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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[8634637] | 79 | rtems_interrupt_enable(level); |
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| 80 | |
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[11d6263b] | 81 | return e; |
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[8634637] | 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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[11d6263b] | 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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[8634637] | 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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[11d6263b] | 102 | while ((e = bsp_interrupt_server_get_entry()) != NULL) { |
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| 103 | (*e->handler)(e->arg); |
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[8634637] | 104 | |
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[11d6263b] | 105 | bsp_interrupt_vector_enable(e->vector); |
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| 106 | } |
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[8634637] | 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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[27de3942] | 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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[8634637] | 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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[11d6263b] | 161 | e = calloc(1, sizeof(*e)); |
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[8634637] | 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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[27de3942] | 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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[8634637] | 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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[27de3942] | 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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[8634637] | 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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[11d6263b] | 255 | &bsp_interrupt_server_id |
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[8634637] | 256 | ); |
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| 257 | if (sc != RTEMS_SUCCESSFUL) { |
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[11d6263b] | 258 | return RTEMS_TOO_MANY; |
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[8634637] | 259 | } |
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| 260 | |
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| 261 | sc = rtems_task_start( |
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[11d6263b] | 262 | bsp_interrupt_server_id, |
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[8634637] | 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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[11d6263b] | 268 | rtems_task_delete(bsp_interrupt_server_id); |
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| 269 | bsp_interrupt_server_id = RTEMS_ID_NONE; |
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[8634637] | 270 | |
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[11d6263b] | 271 | return RTEMS_TOO_MANY; |
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[8634637] | 272 | } |
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| 273 | |
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| 274 | return RTEMS_SUCCESSFUL; |
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| 275 | } |
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