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authorAurelien Jarno <aurelien@aurel32.net>2008-05-02 17:02:23 +0200
committerAvi Kivity <avi@qumranet.com>2008-07-20 12:40:49 +0300
commitf697554515b06e8d7264f316b25e6da943407142 (patch)
treef15a67cee17245c03f90c6a931b02fb34e687a4c /arch/x86
parent2e2e3738af33575cba59597acd5e80cdd5ec11ee (diff)
KVM: PIT: support mode 3
The in-kernel PIT emulation ignores pending timers if operating under mode 3, which for example Hurd uses. This mode should output a square wave, high for (N+1)/2 counts and low for (N-1)/2 counts. As we only care about the resulting interrupts, the period is N, and mode 3 is the same as mode 2 with regard to interrupts. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/i8254.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 735ec9a0b36..60074dc66bd 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -308,6 +308,7 @@ static void pit_load_count(struct kvm *kvm, int channel, u32 val)
create_pit_timer(&ps->pit_timer, val, 0);
break;
case 2:
+ case 3:
create_pit_timer(&ps->pit_timer, val, 1);
break;
default: