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authorJeff Fan <jeff.fan@intel.com>2015-12-18 03:23:53 +0000
committervanjeff <vanjeff@Edk2>2015-12-18 03:23:53 +0000
commit9d39ed931bf59b8d5afdccf7e1c30ece817b7a04 (patch)
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parent54a3e8c9f57935ea95b9b255cb1ca59bbc03e6ea (diff)
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UefiCpuPkg: Add PCD PcdCpuApTargetCstate
This new PCD is used to specify the AP C-state value by MWAIT instruction. More deeper C-state means more longer latency time when APs exiting from MWAIT state. Platforms need to balance the performance and power saving to find the proper C-state for APs. Also, some processor may not ready for the deepest C-state at the beginning. Platform also could choose the proper chance to place AP into the deeper C-state by set this PCD before hand-off to OS. 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> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19342 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/UefiCpuPkg.uni')
-rw-r--r--UefiCpuPkg/UefiCpuPkg.uni4
1 files changed, 4 insertions, 0 deletions
diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index 2c74a92e06..13f0e41aeb 100644
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -143,3 +143,7 @@
#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_HELP #language en-US "Specifies the AP wait loop state during POST phase."
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_PROMPT #language en-US "The specified AP target C-state for Mwait"
+
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_HELP #language en-US "Specifies the AP target C-state for Mwait during POST phase."
+