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: 
   27: struct IRQState {
   28:     qemu_irq_handler handler;
   29:     void *opaque;
   30:     int n;
   31: };
   32: 
   33: void 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: 
   41: qemu_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: 
   59: static void qemu_notirq(void *opaque, int line, int level)
   60: {
   61:     struct IRQState *irq = opaque;
   62: 
   63:     irq->handler(irq->opaque, irq->n, !level);
   64: }
   65: 
   66: qemu_irq qemu_irq_invert(qemu_irq irq)
   67: {
   68:     /* The default state for IRQs is low, so raise the output now.  */
   69:     qemu_irq_raise(irq);
   70:     return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
   71: }