* [Qemu-devel] [RESEND][PATCH 2/2] ioapic: Implement polarity
@ 2011-08-22 15:46 Jan Kiszka
0 siblings, 0 replies; only message in thread
From: Jan Kiszka @ 2011-08-22 15:46 UTC (permalink / raw)
To: Anthony Liguori, qemu-devel
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>
---
hw/ioapic.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/hw/ioapic.c b/hw/ioapic.c
index 5916387..61991d7 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -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 */
--
1.7.3.4
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