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>

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/irq.h b/hw/irq.h
index 389ed7a506..64da2fd601 100644
--- a/hw/irq.h
+++ b/hw/irq.h
@@ -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