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 }