tree f15a67cee17245c03f90c6a931b02fb34e687a4c
parent 2e2e3738af33575cba59597acd5e80cdd5ec11ee
author Aurelien Jarno <aurelien@aurel32.net> 1209740543 +0200
committer Avi Kivity <avi@qumranet.com> 1216546849 +0300

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>