[Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop is

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Subject:	[Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop issue for Deep C state
From:	"Wei, Gang" <gang.wei@xxxxxxxxx>
Date:	Mon, 14 Jul 2008 16:57:02 +0800
Cc:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx>
Delivery-date:	Mon, 14 Jul 2008 01:57:47 -0700
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Thread-topic:	[PATCH]PIT broadcast to fix local APIC timer stop issue for Deep C state

Local APIC timer may stop at deep C state (C3/C4...) entry/exit. Initial
HPET broadcast working in legacy replacing mode, broke RTC intr, so was
bypassed. This patch add the logic that use platform timer (PIT) to
reenable local APIC timer at C state entry/exit.

Currently, only keep PIT enabled with 100Hz freq. The next step is
trying to dynamically enable/disable PIT while needed, and give it lower
freq.

signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>
signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>
signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>

Jimmy

pit_broadcast.patch
Description: pit_broadcast.patch

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[Xen-devel] [PATCH]PIT broadcast to fix local APIC timer stop issue for