KVM: PIT: support mode 3

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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>

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Aurelien Jarno 2008-05-02 17:02:23 +02:00 • committed by Avi Kivity

parent 2e2e3738af

commit f697554515

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arch/x86/kvm/i8254.c

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