[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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[d9bd59da] | 10 | * Copyright (c) 2009, 2016 embedded brains GmbH. All rights reserved. |
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[5fca9ef] | 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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[8634637] | 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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[c499856] | 20 | * http://www.rtems.org/license/LICENSE. |
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[8634637] | 21 | */ |
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| 22 | |
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| 23 | #include <stdlib.h> |
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| 24 | |
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[11d6263b] | 25 | #include <rtems.h> |
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| 26 | #include <rtems/chain.h> |
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[d9bd59da] | 27 | #include <rtems/score/assert.h> |
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[11d6263b] | 28 | |
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[8634637] | 29 | #include <bsp/irq-generic.h> |
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| 30 | |
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[5fca9ef] | 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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[d9bd59da] | 37 | typedef struct bsp_interrupt_server_action { |
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| 38 | struct bsp_interrupt_server_action *next; |
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[8634637] | 39 | rtems_interrupt_handler handler; |
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| 40 | void *arg; |
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[d9bd59da] | 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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[8634637] | 47 | } bsp_interrupt_server_entry; |
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| 48 | |
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[11d6263b] | 49 | static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE; |
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[8634637] | 50 | |
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[11d6263b] | 51 | static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain); |
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[8634637] | 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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[11d6263b] | 55 | if (bsp_interrupt_server_id != RTEMS_ID_NONE) { |
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[8634637] | 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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[11d6263b] | 62 | static unsigned bsp_interrupt_server_errors; |
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| 63 | |
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[27de3942] | 64 | static void bsp_interrupt_server_trigger(void *arg) |
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[8634637] | 65 | { |
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[610909f] | 66 | rtems_interrupt_lock_context lock_context; |
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[8634637] | 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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[610909f] | 71 | rtems_interrupt_lock_acquire(&bsp_interrupt_server_lock, &lock_context); |
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[5fca9ef] | 72 | |
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[610909f] | 73 | if (rtems_chain_is_node_off_chain(&e->node)) { |
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[5fca9ef] | 74 | rtems_chain_append_unprotected(&bsp_interrupt_server_chain, &e->node); |
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[11d6263b] | 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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[610909f] | 79 | rtems_interrupt_lock_release(&bsp_interrupt_server_lock, &lock_context); |
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| 80 | |
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[4fee129] | 81 | rtems_event_system_send(bsp_interrupt_server_id, RTEMS_EVENT_SYSTEM_SERVER); |
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[11d6263b] | 82 | } |
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| 83 | |
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[d9bd59da] | 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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[11d6263b] | 121 | static bsp_interrupt_server_entry *bsp_interrupt_server_get_entry(void) |
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| 122 | { |
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[5fca9ef] | 123 | rtems_interrupt_lock_context lock_context; |
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[11d6263b] | 124 | bsp_interrupt_server_entry *e; |
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[8dbb14d5] | 125 | rtems_chain_control *chain; |
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[11d6263b] | 126 | |
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[5fca9ef] | 127 | rtems_interrupt_lock_acquire(&bsp_interrupt_server_lock, &lock_context); |
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[8dbb14d5] | 128 | chain = &bsp_interrupt_server_chain; |
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[5fca9ef] | 129 | |
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[8dbb14d5] | 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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[11d6263b] | 136 | } |
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[5fca9ef] | 137 | |
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| 138 | rtems_interrupt_lock_release(&bsp_interrupt_server_lock, &lock_context); |
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[8634637] | 139 | |
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[11d6263b] | 140 | return e; |
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[8634637] | 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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[d9bd59da] | 146 | rtems_event_set events; |
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| 147 | bsp_interrupt_server_entry *e; |
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[11d6263b] | 148 | |
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[d9bd59da] | 149 | rtems_event_system_receive( |
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[4fee129] | 150 | RTEMS_EVENT_SYSTEM_SERVER, |
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[11d6263b] | 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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[8634637] | 155 | |
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[11d6263b] | 156 | while ((e = bsp_interrupt_server_get_entry()) != NULL) { |
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[d9bd59da] | 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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[8634637] | 165 | |
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[d9bd59da] | 166 | bsp_interrupt_vector_enable(vector); |
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[11d6263b] | 167 | } |
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[8634637] | 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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[d9bd59da] | 173 | rtems_option *options; |
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[8634637] | 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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[d9bd59da] | 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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[8634637] | 189 | } |
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| 190 | } |
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| 191 | |
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[d9bd59da] | 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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[8634637] | 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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[d9bd59da] | 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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[8634637] | 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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[27de3942] | 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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[d9bd59da] | 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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[8634637] | 237 | } |
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| 238 | |
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[d9bd59da] | 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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[8634637] | 245 | if (e == NULL) { |
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[d9bd59da] | 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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[8634637] | 285 | } |
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| 286 | |
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[d9bd59da] | 287 | bsp_interrupt_unlock(); |
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[8634637] | 288 | |
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| 289 | if (sc != RTEMS_SUCCESSFUL) { |
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[d9bd59da] | 290 | free(a); |
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[8634637] | 291 | } |
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| 292 | |
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[d9bd59da] | 293 | return sc; |
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[8634637] | 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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[d9bd59da] | 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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[8634637] | 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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[27de3942] | 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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[d9bd59da] | 316 | bsp_interrupt_lock(); |
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[8634637] | 317 | |
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[d9bd59da] | 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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[8634637] | 353 | } |
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| 354 | |
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[d9bd59da] | 355 | bsp_interrupt_unlock(); |
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[8634637] | 356 | |
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[d9bd59da] | 357 | return sc; |
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[8634637] | 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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[27de3942] | 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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[8634637] | 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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[11d6263b] | 380 | &bsp_interrupt_server_id |
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[8634637] | 381 | ); |
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| 382 | if (sc != RTEMS_SUCCESSFUL) { |
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[11d6263b] | 383 | return RTEMS_TOO_MANY; |
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[8634637] | 384 | } |
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| 385 | |
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| 386 | sc = rtems_task_start( |
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[11d6263b] | 387 | bsp_interrupt_server_id, |
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[8634637] | 388 | bsp_interrupt_server_task, |
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| 389 | 0 |
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| 390 | ); |
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[d9bd59da] | 391 | _Assert(sc == RTEMS_SUCCESSFUL); |
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[8634637] | 392 | |
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| 393 | return RTEMS_SUCCESSFUL; |
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| 394 | } |
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