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ioapic: Implement polarity

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If the polarity bit is set in the redirection table, the input level
simply has to inverted as it is low active in this case.

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 2011-08-22 17:46:42 +02:00 committed by Anthony Liguori
parent 1f6f408c8c
commit 0035e5094c
1 changed files with 3 additions and 0 deletions
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3
hw/ioapic.c
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@ -148,6 +148,9 @@ static void ioapic_set_irq(void *opaque, int vector, int level)
uint32_t mask = 1 << vector;
uint64_t entry = s->ioredtbl[vector];
if (entry & (1 << IOAPIC_LVT_POLARITY_SHIFT)) {
level = !level;
}
if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==
IOAPIC_TRIGGER_LEVEL) {
/* level triggered */