diff options
Diffstat (limited to 'hw/i8259.c')
| -rw-r--r-- | hw/i8259.c | 18 |
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; } |