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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2009-04-06 18:51:29 -0700
committerLen Brown <len.brown@intel.com>2009-04-07 18:17:51 -0400
commitdb954b5898dd3ef3ef93f4144158ea8f97deb058 (patch)
tree781b62baa5aa262fca99198ba326e5e9cc44b26a /include/acpi
parent577c9c456f0e1371cbade38eaf91ae8e8a308555 (diff)
downloadop-kernel-dev-db954b5898dd3ef3ef93f4144158ea8f97deb058.zip
op-kernel-dev-db954b5898dd3ef3ef93f4144158ea8f97deb058.tar.gz
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>
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