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      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 void qemu_free_irqs(qemu_irq *s)
     60 {
     61     qemu_free(s[0]);
     62     qemu_free(s);
     63 }
     64 
     65 static 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 
     72 qemu_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