qemu/include/hw/irq.h

#ifndef QEMU_IRQ_H
#define QEMU_IRQ_H

/* Generic IRQ/GPIO pin infrastructure.  */

#define TYPE_IRQ "irq"

typedef struct IRQState *qemu_irq;

typedef void (*qemu_irq_handler)(void *opaque, int n, int level);

void qemu_set_irq(qemu_irq irq, int level);

static inline void qemu_irq_raise(qemu_irq irq)
{
    qemu_set_irq(irq, 1);
}

static inline void qemu_irq_lower(qemu_irq irq)
{
    qemu_set_irq(irq, 0);
}

static inline void qemu_irq_pulse(qemu_irq irq)
{
    qemu_set_irq(irq, 1);
    qemu_set_irq(irq, 0);
}

/* Returns an array of N IRQs. Each IRQ is assigned the argument handler and
 * opaque data.
 */
qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n);

/*
 * Allocates a single IRQ. The irq is assigned with a handler, an opaque
 * data and the interrupt number.
 */
qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n);

/* Extends an Array of IRQs. Old IRQs have their handlers and opaque data
 * preserved. New IRQs are assigned the argument handler and opaque data.
 */
qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
                                void *opaque, int n);

void qemu_free_irqs(qemu_irq *s, int n);
void qemu_free_irq(qemu_irq irq);

/* Returns a new IRQ with opposite polarity.  */
qemu_irq qemu_irq_invert(qemu_irq irq);

/* Returns a new IRQ which feeds into both the passed IRQs.
 * It's probably better to use the TYPE_SPLIT_IRQ device instead.
 */
qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);

/* Returns a new IRQ set which connects 1:1 to another IRQ set, which
 * may be set later.
 */
qemu_irq *qemu_irq_proxy(qemu_irq **target, int n);

/* For internal use in qtest.  Similar to qemu_irq_split, but operating
   on an existing vector of qemu_irq.  */
void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n);

#endif