tree 781b62baa5aa262fca99198ba326e5e9cc44b26a
parent 577c9c456f0e1371cbade38eaf91ae8e8a308555
author Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 1239069089 -0700
committer Len Brown <len.brown@intel.com> 1239142671 -0400

x86 ACPI: Add support for Always Running APIC timer

Add support for Always Running APIC timer, CPUID_0x6_EAX_Bit2.
This bit means the APIC timer continues to run even when CPU is
in deep C-states.

The advantage is that we can use LAPIC timer on these CPUs
always, and there is no need for "slow to read and program"
external timers (HPET/PIT) and the timer broadcast logic
and related code in C-state entry and exit.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Len Brown <len.brown@intel.com>