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irq: introduce qemu_irq_proxy() 

In some cases we have a circular dependency involving irqs - the irq
controller depends on a bus, which in turn depends on the irq controller.
Add qemu_irq_proxy() which acts as a passthrough, except that the target
irq may be set later on.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-09-18 15:58:26 +03:00 committed by Anthony Liguori
parent e22517086b
commit 22ec3283ef
2 changed files with 19 additions and 0 deletions
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14
hw/irq.c
View File

@ -90,3 +90,17 @@ qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
s[1] = irq2;
return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
}
static void proxy_irq_handler(void *opaque, int n, int level)
{
qemu_irq **target = opaque;
if (*target) {
qemu_set_irq((*target)[n], level);
}
}
qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
{
return qemu_allocate_irqs(proxy_irq_handler, target, n);
}

5
hw/irq.h
View File

@ -33,4 +33,9 @@ qemu_irq qemu_irq_invert(qemu_irq irq);
/* Returns a new IRQ which feeds into both the passed IRQs */
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);
#endif