Subversion Repositories HelenOS

Rev

Rev 4581 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
4173 jermar 1 
/*
2 
 * Copyright (c) 2009 Jakub Jermar
3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
29 
/** @addtogroup generic
30 
 * @{
31 
 */
32 
/**
33 
 * @file
4252 decky 34 
 * @brief Kernel event notifications.
4173 jermar 35 
 */
36 
 
4252 decky 37 
#include <ipc/event.h>
38 
#include <ipc/event_types.h>
4173 jermar 39 
#include <mm/slab.h>
40 
#include <arch/types.h>
41 
#include <synch/spinlock.h>
42 
#include <console/console.h>
43 
#include <memstr.h>
44 
#include <errno.h>
45 
#include <arch.h>
46 
 
47 
/**
48 
 * The events array.
49 
 * Arranging the events in this two-dimensional array should decrease the
50 
 * likelyhood of cacheline ping-pong.
51 
 */
4252 decky 52 
static event_t events[EVENT_END];
4173 jermar 53 
 
54 
/** Initialize kernel events. */
55 
void event_init(void)
56 
{
4252 decky 57 
    unsigned int i;
58 
 
4173 jermar 59 
    for (i = 0; i < EVENT_END; i++) {
4252 decky 60 
        spinlock_initialize(&events[i].lock, "event.lock");
61 
        events[i].answerbox = NULL;
62 
        events[i].counter = 0;
63 
        events[i].method = 0;
4173 jermar 64 
    }
65 
}
66 
 
4581 mejdrech 67 
static int event_subscribe(event_type_t evno, unative_t method,
68 
    answerbox_t *answerbox)
4173 jermar 69 
{
4252 decky 70 
    if (evno >= EVENT_END)
4173 jermar 71 
        return ELIMIT;
4252 decky 72 
 
73 
    spinlock_lock(&events[evno].lock);
74 
 
75 
    int res;
76 
 
77 
    if (events[evno].answerbox == NULL) {
78 
        events[evno].answerbox = answerbox;
79 
        events[evno].method = method;
80 
        events[evno].counter = 0;
4173 jermar 81 
        res = EOK;
4252 decky 82 
    } else
83 
        res = EEXISTS;
84 
 
85 
    spinlock_unlock(&events[evno].lock);
86 
 
4173 jermar 87 
    return res;
88 
}
89 
 
90 
unative_t sys_event_subscribe(unative_t evno, unative_t method)
91 
{
92 
    return (unative_t) event_subscribe((event_type_t) evno, (unative_t)
93 
        method, &TASK->answerbox);
94 
}
95 
 
4252 decky 96 
bool event_is_subscribed(event_type_t evno)
4173 jermar 97 
{
98 
    bool res;
4252 decky 99 
 
100 
    ASSERT(evno < EVENT_END);
101 
 
102 
    spinlock_lock(&events[evno].lock);
103 
    res = events[evno].answerbox != NULL;
104 
    spinlock_unlock(&events[evno].lock);
105 
 
4173 jermar 106 
    return res;
107 
}
108 
 
109 
 
110 
void event_cleanup_answerbox(answerbox_t *answerbox)
111 
{
4252 decky 112 
    unsigned int i;
113 
 
4173 jermar 114 
    for (i = 0; i < EVENT_END; i++) {
4252 decky 115 
        spinlock_lock(&events[i].lock);
116 
        if (events[i].answerbox == answerbox) {
117 
            events[i].answerbox = NULL;
118 
            events[i].counter = 0;
119 
            events[i].method = 0;
4173 jermar 120 
        }
4252 decky 121 
        spinlock_unlock(&events[i].lock);
4173 jermar 122 
    }
123 
}
124 
 
4581 mejdrech 125 
void event_notify(event_type_t evno, unative_t a1, unative_t a2, unative_t a3,
4173 jermar 126 
    unative_t a4, unative_t a5)
127 
{
4252 decky 128 
    ASSERT(evno < EVENT_END);
129 
 
130 
    spinlock_lock(&events[evno].lock);
131 
    if (events[evno].answerbox != NULL) {
4173 jermar 132 
        call_t *call = ipc_call_alloc(FRAME_ATOMIC);
133 
        if (call) {
134 
            call->flags |= IPC_CALL_NOTIF;
4252 decky 135 
            call->priv = ++events[evno].counter;
136 
            IPC_SET_METHOD(call->data, events[evno].method);
4173 jermar 137 
            IPC_SET_ARG1(call->data, a1);
138 
            IPC_SET_ARG2(call->data, a2);
139 
            IPC_SET_ARG3(call->data, a3);
140 
            IPC_SET_ARG4(call->data, a4);
141 
            IPC_SET_ARG5(call->data, a5);
4252 decky 142 
 
4718 mejdrech 143 
            ipl_t ipl = interrupts_disable();
4252 decky 144 
            spinlock_lock(&events[evno].answerbox->irq_lock);
145 
            list_append(&call->link, &events[evno].answerbox->irq_notifs);
146 
            spinlock_unlock(&events[evno].answerbox->irq_lock);
4718 mejdrech 147 
            interrupts_restore(ipl);
4252 decky 148 
 
149 
            waitq_wakeup(&events[evno].answerbox->wq, WAKEUP_FIRST);
4173 jermar 150 
        }
151 
    }
4252 decky 152 
    spinlock_unlock(&events[evno].lock);
4173 jermar 153 
}
154 
 
155 
/** @}
156 
 */