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i8259: Do not clear level-triggered lines in IRR on init

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When an input line is handled as level-triggered, it will immediately
raise an IRQ on the output of a PIC again that goes through an init
reset. So only clear the edge-triggered inputs from IRR in that
scenario.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2012-01-24 16:29:29 +01:00 committed by Anthony Liguori
parent 4aa5d2853a
commit aa24822bdc
3 changed files with 3 additions and 3 deletions
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2
hw/i8259.c
View File

@ -231,8 +231,8 @@ static void pic_reset(DeviceState *dev)
{
PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, dev);
pic_init_reset(s);
s->elcr = 0;
pic_init_reset(s);
}
static void pic_ioport_write(void *opaque, target_phys_addr_t addr64,

2
hw/i8259_common.c
View File

@ -28,7 +28,7 @@
void pic_reset_common(PICCommonState *s)
{
s->last_irr = 0;
s->irr = 0;
s->irr &= s->elcr;
s->imr = 0;
s->isr = 0;
s->priority_add = 0;

2
hw/kvm/i8259.c
View File

@ -84,8 +84,8 @@ static void kvm_pic_reset(DeviceState *dev)
{
PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, dev);
pic_reset_common(s);
s->elcr = 0;
pic_reset_common(s);
kvm_pic_put(s);
}