Commit f6975545 authored May 02, 2008 by Aurelien Jarno Committed by Avi Kivity Jul 20, 2008

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>

parent 2e2e3738

arch/x86/kvm/i8254.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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: