1/*
2 * QEMU IRQ/GPIO common code.
3 *
4 * Copyright (c) 2007 CodeSourcery.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24#include "qemu-common.h"
25#include "irq.h"
26
27struct IRQState {
28    qemu_irq_handler handler;
29    void *opaque;
30    int n;
31};
32
33void qemu_set_irq(qemu_irq irq, int level)
34{
35    if (!irq)
36        return;
37
38    irq->handler(irq->opaque, irq->n, level);
39}
40
41qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
42{
43    qemu_irq *s;
44    struct IRQState *p;
45    int i;
46
47    s = (qemu_irq *)qemu_mallocz(sizeof(qemu_irq) * n);
48    p = (struct IRQState *)qemu_mallocz(sizeof(struct IRQState) * n);
49    for (i = 0; i < n; i++) {
50        p->handler = handler;
51        p->opaque = opaque;
52        p->n = i;
53        s[i] = p;
54        p++;
55    }
56    return s;
57}
58
59void qemu_free_irqs(qemu_irq *s)
60{
61    qemu_free(s[0]);
62    qemu_free(s);
63}
64
65static void qemu_notirq(void *opaque, int line, int level)
66{
67    struct IRQState *irq = opaque;
68
69    irq->handler(irq->opaque, irq->n, !level);
70}
71
72qemu_irq qemu_irq_invert(qemu_irq irq)
73{
74    /* The default state for IRQs is low, so raise the output now.  */
75    qemu_irq_raise(irq);
76    return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
77}
78