LXR qemu/hw/irq.c

   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
  79static void qemu_splitirq(void *opaque, int line, int level)
  80{
  81    struct IRQState **irq = opaque;
  82    irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
  83    irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
  84}
  85
  86qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
  87{
  88    qemu_irq *s = qemu_mallocz(2 * sizeof(qemu_irq));
  89    s[0] = irq1;
  90    s[1] = irq2;
  91    return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
  92}
  93