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 "vl.h"
  25
  26 struct IRQState {
  27     qemu_irq_handler handler;
  28     void *opaque;
  29     int n;
  30 };
  31
  32 void qemu_set_irq(qemu_irq irq, int level)
  33 {
  34     if (!irq)
  35         return;
  36
  37     irq->handler(irq->opaque, irq->n, level);
  38 }
  39
  40 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
  41 {
  42     qemu_irq *s;
  43     struct IRQState *p;
  44     int i;
  45
  46     s = (qemu_irq *)qemu_mallocz(sizeof(qemu_irq) * n);
  47     p = (struct IRQState *)qemu_mallocz(sizeof(struct IRQState) * n);
  48     for (i = 0; i < n; i++) {
  49         p->handler = handler;
  50         p->opaque = opaque;
  51         p->n = i;
  52         s[i] = p;
  53         p++;
  54     }
  55     return s;
  56 }
  57
  58 static void qemu_notirq(void *opaque, int line, int level)
  59 {
  60     struct IRQState *irq = opaque;
  61
  62     irq->handler(irq->opaque, irq->n, !level);
  63 }
  64
  65 qemu_irq qemu_irq_invert(qemu_irq irq)
  66 {
  67     return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
  68 }