Revision: 19342
http://sourceforge.net/p/edk2/code/19342
Author: vanjeff
Date: 2015-12-18 03:23:53 +0000 (Fri, 18 Dec 2015)
Log Message:
-----------
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 <[email protected]>
Cc: Michael Kinney <[email protected]>
Cc: Jordan Justen <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
Reviewed-by: Michael Kinney <[email protected]>
Modified Paths:
--------------
trunk/edk2/UefiCpuPkg/UefiCpuPkg.dec
trunk/edk2/UefiCpuPkg/UefiCpuPkg.uni
Modified: trunk/edk2/UefiCpuPkg/UefiCpuPkg.dec
===================================================================
--- trunk/edk2/UefiCpuPkg/UefiCpuPkg.dec 2015-12-18 03:23:27 UTC (rev
19341)
+++ trunk/edk2/UefiCpuPkg/UefiCpuPkg.dec 2015-12-18 03:23:53 UTC (rev
19342)
@@ -190,6 +190,11 @@
# @Prompt The AP wait loop state.
# @ValidRange 0x80000001 | 1 - 3
gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006
+ ## Specifies the AP target C-state for Mwait during POST phase.
+ # The default value 0 means C1 state.
+ # The value is defined as below.<BR><BR>
+ # @Prompt The specified AP target C-state for Mwait.
+ gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate|0|UINT8|0x00000007
[PcdsDynamic, PcdsDynamicEx]
## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
Modified: trunk/edk2/UefiCpuPkg/UefiCpuPkg.uni
===================================================================
--- trunk/edk2/UefiCpuPkg/UefiCpuPkg.uni 2015-12-18 03:23:27 UTC (rev
19341)
+++ trunk/edk2/UefiCpuPkg/UefiCpuPkg.uni 2015-12-18 03:23:53 UTC (rev
19342)
@@ -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."
+
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