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| author | Jeff Fan <jeff.fan@intel.com> | 2015-12-18 03:23:27 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@Edk2> | 2015-12-18 03:23:27 +0000 |
| commit | 54a3e8c9f57935ea95b9b255cb1ca59bbc03e6ea (patch) | |
| tree | 9e349475b0eb21d13336c4f270569a4af911b406 /UefiCpuPkg/UefiCpuPkg.dec | |
| parent | d603b1151c3b6d6961c65693063f16bb71a3c91c (diff) | |
| download | edk2-54a3e8c9f57935ea95b9b255cb1ca59bbc03e6ea.tar.gz edk2-54a3e8c9f57935ea95b9b255cb1ca59bbc03e6ea.tar.bz2 edk2-54a3e8c9f57935ea95b9b255cb1ca59bbc03e6ea.zip | |
UefiCpuPkg: Add PCD PcdCpuApLoopMode
This new PCD is used to specify the AP loop mode during POST phase.
The value 1 means we will place AP in the Hlt-Loop state by HLT instruction.
BSP need to send INIT-SIPI-SIPI to wake up APs.
The value 2 means we will place AP in the deepest C-state by MWAIT instruction.
BSP need to modify the monitor buffer by MONITOR instruction to wake up APs.
The value 3 means we will place AP in the Run-loop state. APs are running.
BSP need to write one semaphore to wake up APs.
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>
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@19341 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/UefiCpuPkg.dec')
| -rw-r--r-- | UefiCpuPkg/UefiCpuPkg.dec | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index a694146689..0d42918427 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -182,6 +182,14 @@ ## Specifies the size of the microcode Region.
# @Prompt Microcode Region size.
gUefiCpuPkgTokenSpaceGuid.PcdCpuMicrocodePatchRegionSize|0x0|UINT64|0x00000006
+ ## Specifies the AP wait loop state during POST phase.
+ # The value is defined as below.<BR><BR>
+ # 1: Place AP in the Hlt-Loop state.<BR>
+ # 2: Place AP in the Mwait-Loop state.<BR>
+ # 3: Place AP in the Run-Loop state.<BR>
+ # @Prompt The AP wait loop state.
+ # @ValidRange 0x80000001 | 1 - 3
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006
[PcdsDynamic, PcdsDynamicEx]
## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
|