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UefiCpuPkg/CpuMpPei: Add GetApLoopMode() to get AP loop mode

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Add GetApLoopMode() that will get PCD PcdCpuApLoopMode firstly. If it is
ApInMwaitLoop, we will check if MONITOR/MWAIT feature supported by CPUID. If
MONITOR/MWAIT feature is not supported, force AP loop mode to ApInHltLoop.

GetApLoopMode() also return the largest line size required.

Contributed-under: TianoCore Contribution Agreement 1.0
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19343 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan
2015-12-18 03:24:27 +00:00
committed by vanjeff
parent 9d39ed931b
commit 4de216c016
4 changed files with 57 additions and 0 deletions
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2
UefiCpuPkg/Include/Register/Cpuid.h
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@@ -31,6 +31,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#define CPUID_CACHE_PARAMS 0x4
#define CPUID_MONITOR_MWAIT 0x5
#define CPUID_EXTENDED_TOPOLOGY 0xB
#define CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_INVALID 0x0
#define CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_SMT 0x1