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
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# @Prompt The AP wait loop state.
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# @Prompt The AP wait loop state.
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# @ValidRange 0x80000001 | 1 - 3
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# @ValidRange 0x80000001 | 1 - 3
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gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006
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gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006
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## Specifies the AP target C-state for Mwait during POST phase.
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# The default value 0 means C1 state.
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# The value is defined as below.<BR><BR>
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# @Prompt The specified AP target C-state for Mwait.
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gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate|0|UINT8|0x00000007
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[PcdsDynamic, PcdsDynamicEx]
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[PcdsDynamic, PcdsDynamicEx]
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## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
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## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
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#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_HELP #language en-US "Specifies the AP wait loop state during POST phase."
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#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_HELP #language en-US "Specifies the AP wait loop state during POST phase."
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#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_PROMPT #language en-US "The specified AP target C-state for Mwait"
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#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_HELP #language en-US "Specifies the AP target C-state for Mwait during POST phase."
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