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-rw-r--r--hw/i8259.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/hw/i8259.c b/hw/i8259.c
index 65876662a1..7ecb7e1de6 100644
--- a/hw/i8259.c
+++ b/hw/i8259.c
@@ -26,6 +26,7 @@
#include "isa.h"
#include "monitor.h"
#include "qemu-timer.h"
+#include "sysemu.h"
#include "i8259_internal.h"
/* debug PIC */
@@ -193,6 +194,20 @@ int pic_read_irq(DeviceState *d)
pic_intack(slave_pic, irq2);
} else {
/* spurious IRQ on slave controller */
+ if (no_spurious_interrupt_hack) {
+ /* Pretend it was delivered and acknowledged. If
+ * it was spurious due to slave_pic->imr, then
+ * as soon as the mask is cleared, the slave will
+ * re-trigger IRQ2 on the master. If it is spurious for
+ * some other reason, make sure we don't keep trying
+ * to half-process the same spurious interrupt over
+ * and over again.
+ */
+ s->irr &= ~(1<<irq);
+ s->last_irr &= ~(1<<irq);
+ s->isr &= ~(1<<irq);
+ return -1;
+ }
irq2 = 7;
}
intno = slave_pic->irq_base + irq2;
@@ -202,6 +217,9 @@ int pic_read_irq(DeviceState *d)
pic_intack(s, irq);
} else {
/* spurious IRQ on host controller */
+ if (no_spurious_interrupt_hack) {
+ return -1;
+ }
irq = 7;
intno = s->irq_base + irq;
}