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4377 svoboda 1 
/*
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 * Copyright (c) 2009 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/**
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 * @file
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 * @brief Kernel event notifications.
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 */
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#include <ipc/event.h>
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#include <ipc/event_types.h>
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#include <mm/slab.h>
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#include <arch/types.h>
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#include <synch/spinlock.h>
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#include <console/console.h>
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#include <memstr.h>
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#include <errno.h>
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#include <arch.h>
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/**
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 * The events array.
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 * Arranging the events in this two-dimensional array should decrease the
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 * likelyhood of cacheline ping-pong.
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 */
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static event_t events[EVENT_END];
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/** Initialize kernel events. */
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void event_init(void)
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{
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    unsigned int i;
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    for (i = 0; i < EVENT_END; i++) {
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        spinlock_initialize(&events[i].lock, "event.lock");
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        events[i].answerbox = NULL;
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        events[i].counter = 0;
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        events[i].method = 0;
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    }
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}
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4692 svoboda 67 
static int event_subscribe(event_type_t evno, unative_t method,
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    answerbox_t *answerbox)
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{
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    if (evno >= EVENT_END)
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        return ELIMIT;
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    spinlock_lock(&events[evno].lock);
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    int res;
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    if (events[evno].answerbox == NULL) {
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        events[evno].answerbox = answerbox;
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        events[evno].method = method;
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        events[evno].counter = 0;
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        res = EOK;
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    } else
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        res = EEXISTS;
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    spinlock_unlock(&events[evno].lock);
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    return res;
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}
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unative_t sys_event_subscribe(unative_t evno, unative_t method)
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{
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    return (unative_t) event_subscribe((event_type_t) evno, (unative_t)
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        method, &TASK->answerbox);
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}
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bool event_is_subscribed(event_type_t evno)
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{
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    bool res;
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    ASSERT(evno < EVENT_END);
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    spinlock_lock(&events[evno].lock);
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    res = events[evno].answerbox != NULL;
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    spinlock_unlock(&events[evno].lock);
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    return res;
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}
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void event_cleanup_answerbox(answerbox_t *answerbox)
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{
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    unsigned int i;
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    for (i = 0; i < EVENT_END; i++) {
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        spinlock_lock(&events[i].lock);
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        if (events[i].answerbox == answerbox) {
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            events[i].answerbox = NULL;
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            events[i].counter = 0;
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            events[i].method = 0;
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        }
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        spinlock_unlock(&events[i].lock);
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    }
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}
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void event_notify(event_type_t evno, unative_t a1, unative_t a2, unative_t a3,
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    unative_t a4, unative_t a5)
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{
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    ASSERT(evno < EVENT_END);
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    spinlock_lock(&events[evno].lock);
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    if (events[evno].answerbox != NULL) {
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        call_t *call = ipc_call_alloc(FRAME_ATOMIC);
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        if (call) {
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            call->flags |= IPC_CALL_NOTIF;
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            call->priv = ++events[evno].counter;
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            IPC_SET_METHOD(call->data, events[evno].method);
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            IPC_SET_ARG1(call->data, a1);
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            IPC_SET_ARG2(call->data, a2);
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            IPC_SET_ARG3(call->data, a3);
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            IPC_SET_ARG4(call->data, a4);
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            IPC_SET_ARG5(call->data, a5);
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            ipl_t ipl = interrupts_disable();
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            spinlock_lock(&events[evno].answerbox->irq_lock);
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            list_append(&call->link, &events[evno].answerbox->irq_notifs);
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            spinlock_unlock(&events[evno].answerbox->irq_lock);
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            interrupts_restore(ipl);
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            waitq_wakeup(&events[evno].answerbox->wq, WAKEUP_FIRST);
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        }
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    }
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    spinlock_unlock(&events[evno].lock);
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}
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/** @}
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 */