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| 4377 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2009 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup generic |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 34 | * @brief Kernel event notifications. |
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| 35 | */ |
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| 36 | |||
| 37 | #include <ipc/event.h> |
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| 38 | #include <ipc/event_types.h> |
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| 39 | #include <mm/slab.h> |
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| 40 | #include <arch/types.h> |
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| 41 | #include <synch/spinlock.h> |
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| 42 | #include <console/console.h> |
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| 43 | #include <memstr.h> |
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| 44 | #include <errno.h> |
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| 45 | #include <arch.h> |
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| 46 | |||
| 47 | /** |
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| 48 | * The events array. |
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| 49 | * Arranging the events in this two-dimensional array should decrease the |
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| 50 | * likelyhood of cacheline ping-pong. |
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| 51 | */ |
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| 52 | static event_t events[EVENT_END]; |
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| 53 | |||
| 54 | /** Initialize kernel events. */ |
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| 55 | void event_init(void) |
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| 56 | { |
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| 57 | unsigned int i; |
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| 58 | |||
| 59 | for (i = 0; i < EVENT_END; i++) { |
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| 60 | spinlock_initialize(&events[i].lock, "event.lock"); |
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| 61 | events[i].answerbox = NULL; |
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| 62 | events[i].counter = 0; |
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| 63 | events[i].method = 0; |
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| 64 | } |
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| 65 | } |
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| 66 | |||
| 67 | static int |
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| 68 | event_subscribe(event_type_t evno, unative_t method, answerbox_t *answerbox) |
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| 69 | { |
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| 70 | if (evno >= EVENT_END) |
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| 71 | return ELIMIT; |
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| 72 | |||
| 73 | spinlock_lock(&events[evno].lock); |
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| 74 | |||
| 75 | int res; |
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| 76 | |||
| 77 | if (events[evno].answerbox == NULL) { |
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| 78 | events[evno].answerbox = answerbox; |
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| 79 | events[evno].method = method; |
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| 80 | events[evno].counter = 0; |
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| 81 | res = EOK; |
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| 82 | } else |
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| 83 | res = EEXISTS; |
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| 84 | |||
| 85 | spinlock_unlock(&events[evno].lock); |
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| 86 | |||
| 87 | return res; |
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| 88 | } |
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| 89 | |||
| 90 | unative_t sys_event_subscribe(unative_t evno, unative_t method) |
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| 91 | { |
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| 92 | return (unative_t) event_subscribe((event_type_t) evno, (unative_t) |
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| 93 | method, &TASK->answerbox); |
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| 94 | } |
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| 95 | |||
| 96 | bool event_is_subscribed(event_type_t evno) |
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| 97 | { |
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| 98 | bool res; |
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| 99 | |||
| 100 | ASSERT(evno < EVENT_END); |
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| 101 | |||
| 102 | spinlock_lock(&events[evno].lock); |
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| 103 | res = events[evno].answerbox != NULL; |
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| 104 | spinlock_unlock(&events[evno].lock); |
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| 105 | |||
| 106 | return res; |
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| 107 | } |
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| 108 | |||
| 109 | |||
| 110 | void event_cleanup_answerbox(answerbox_t *answerbox) |
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| 111 | { |
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| 112 | unsigned int i; |
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| 113 | |||
| 114 | for (i = 0; i < EVENT_END; i++) { |
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| 115 | spinlock_lock(&events[i].lock); |
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| 116 | if (events[i].answerbox == answerbox) { |
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| 117 | events[i].answerbox = NULL; |
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| 118 | events[i].counter = 0; |
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| 119 | events[i].method = 0; |
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| 120 | } |
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| 121 | spinlock_unlock(&events[i].lock); |
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| 122 | } |
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| 123 | } |
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| 124 | |||
| 125 | void |
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| 126 | event_notify(event_type_t evno, unative_t a1, unative_t a2, unative_t a3, |
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| 127 | unative_t a4, unative_t a5) |
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| 128 | { |
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| 129 | ASSERT(evno < EVENT_END); |
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| 130 | |||
| 131 | spinlock_lock(&events[evno].lock); |
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| 132 | if (events[evno].answerbox != NULL) { |
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| 133 | call_t *call = ipc_call_alloc(FRAME_ATOMIC); |
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| 134 | if (call) { |
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| 135 | call->flags |= IPC_CALL_NOTIF; |
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| 136 | call->priv = ++events[evno].counter; |
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| 137 | IPC_SET_METHOD(call->data, events[evno].method); |
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| 138 | IPC_SET_ARG1(call->data, a1); |
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| 139 | IPC_SET_ARG2(call->data, a2); |
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| 140 | IPC_SET_ARG3(call->data, a3); |
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| 141 | IPC_SET_ARG4(call->data, a4); |
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| 142 | IPC_SET_ARG5(call->data, a5); |
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| 143 | |||
| 144 | spinlock_lock(&events[evno].answerbox->irq_lock); |
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| 145 | list_append(&call->link, &events[evno].answerbox->irq_notifs); |
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| 146 | spinlock_unlock(&events[evno].answerbox->irq_lock); |
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| 147 | |||
| 148 | waitq_wakeup(&events[evno].answerbox->wq, WAKEUP_FIRST); |
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| 149 | } |
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| 150 | } |
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| 151 | spinlock_unlock(&events[evno].lock); |
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| 152 | } |
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| 153 | |||
| 154 | /** @} |
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| 155 | */ |