[edk2-devel] [PATCH v3 1/2] UefiCpuPkg: Remove FIT based microcode shadow logic from MpInitLib.
Michael D Kinney
michael.d.kinney at intel.com
Thu Feb 13 23:46:16 UTC 2020
Reviewed-by: Michael D Kinney <michael.d.kinney at intel.com>
Mike
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On
> Behalf Of Siyuan, Fu
> Sent: Wednesday, February 12, 2020 5:57 PM
> To: devel at edk2.groups.io
> Cc: Dong, Eric <eric.dong at intel.com>; Ni, Ray
> <ray.ni at intel.com>; Laszlo Ersek <lersek at redhat.com>
> Subject: [edk2-devel] [PATCH v3 1/2] UefiCpuPkg: Remove
> FIT based microcode shadow logic from MpInitLib.
>
> V2 Changes:
> Rename EDKII_PEI_CPU_MICROCODE_ID to
> EDKII_PEI_MICROCODE_CPU_ID.
> Return EFI_UNSUPPORTED instead of EFI_NOT_FOUND if no
> platform
> microcode shadow PPI/Protocol is found.
> Remove PcdCpuShadowMicrocodeByFit related tokens from
> UefiCpuPkg.uni
> V3 Changes
> Add comments to DXE version PlatformShadowMicrocode().
>
> Commit c7c964b and dd01704 add header file for FIT
> table and update
> MpInitLib to support FIT based microcode shadow
> operation. There are
> comments that FIT is Intel specific specification
> instead of industry
> standard, which should not be placed in EDK2 MdePkg and
> UefiCpuPkg.
> So this patch adds a platform PPI for the microcode
> shadow logic, and
> remove the FIT related code from EDK2.
> The FIT based microcode shadow support will be
> implemented as a new
> platform PEIM in IntelSiliconPkg in edk2-platforms.
> This patch doesn't provide a DXE version shadow
> microcode protocol,
> a platform which only uses DxeMpInitLib instance only
> supports PCD
> based microcode shadowing.
>
> A detailed design doc can be found here:
> https://edk2.groups.io/g/devel/files/Designs/2020/0214/
> Support%20
> the%202nd%20Microcode%20FV%20Flash%20Region.pdf
>
> TEST: Tested on FIT enabled platform.
> BZ:
> https://tianocore.acgmultimedia.com/show_bug.cgi?id=244
> 9
>
> Cc: Eric Dong <eric.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Signed-off-by: Siyuan Fu <siyuan.fu at intel.com>
> ---
> UefiCpuPkg/Include/Ppi/ShadowMicrocode.h | 66
> +++++++++++
> UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 -
> UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 26
> ++++-
> UefiCpuPkg/Library/MpInitLib/Microcode.c | 105 +-
> ----------------
> UefiCpuPkg/Library/MpInitLib/MpLib.h | 19
> +++-
> UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf | 4 +-
> UefiCpuPkg/Library/MpInitLib/PeiMpLib.c | 68
> ++++++++++++
> UefiCpuPkg/UefiCpuPkg.dec | 11 +-
> UefiCpuPkg/UefiCpuPkg.uni | 6 -
> 9 files changed, 183 insertions(+), 123 deletions(-)
> create mode 100644
> UefiCpuPkg/Include/Ppi/ShadowMicrocode.h
>
> diff --git a/UefiCpuPkg/Include/Ppi/ShadowMicrocode.h
> b/UefiCpuPkg/Include/Ppi/ShadowMicrocode.h
> new file mode 100644
> index 0000000000..be48965422
> --- /dev/null
> +++ b/UefiCpuPkg/Include/Ppi/ShadowMicrocode.h
> @@ -0,0 +1,66 @@
> +/** @file
> + This file declares EDKII Shadow Microcode PPI.
> +
> + Copyright (c) 2020, Intel Corporation. All rights
> reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef __PPI_SHADOW_MICROCODE_H__
> +#define __PPI_SHADOW_MICROCODE_H__
> +
> +#define EDKII_PEI_SHADOW_MICROCODE_PPI_GUID \
> + { \
> + 0x430f6965, 0x9a69, 0x41c5, { 0x93, 0xed, 0x8b,
> 0xf0, 0x64, 0x35, 0xc1, 0xc6 } \
> + }
> +
> +typedef struct _EDKII_PEI_SHADOW_MICROCODE_PPI
> EDKII_PEI_SHADOW_MICROCODE_PPI;
> +
> +typedef struct {
> + UINT32 ProcessorSignature;
> + UINT8 PlatformId;
> +} EDKII_PEI_MICROCODE_CPU_ID;
> +
> +/**
> + Shadow microcode update patches to memory.
> +
> + The function is used for shadowing microcode update
> patches to a continuous memory.
> + It shall allocate memory buffer and only shadow the
> microcode patches for those
> + processors specified by MicrocodeCpuId array. The
> checksum verification may be
> + skiped in this function so the caller must perform
> checksum verification before
> + using the microcode patches in returned memory
> buffer.
> +
> + @param[in] This The PPI instance
> pointer.
> + @param[in] CpuIdCount Number of elements
> in MicrocodeCpuId array.
> + @param[in] MicrocodeCpuId A pointer to an
> array of EDKII_PEI_MICROCODE_CPU_ID
> + structures.
> + @param[out] BufferSize Pointer to receive
> the total size of Buffer.
> + @param[out] Buffer Pointer to receive
> address of allocated memory
> + with microcode
> patches data in it.
> +
> + @retval EFI_SUCCESS The microcode has
> been shadowed to memory.
> + @retval EFI_OUT_OF_RESOURCES The operation fails
> due to lack of resources.
> +
> +**/
> +typedef
> +EFI_STATUS
> +(EFIAPI *EDKII_PEI_SHADOW_MICROCODE) (
> + IN EDKII_PEI_SHADOW_MICROCODE_PPI *This,
> + IN UINTN
> CpuIdCount,
> + IN EDKII_PEI_MICROCODE_CPU_ID
> *MicrocodeCpuId,
> + OUT UINTN
> *BufferSize,
> + OUT VOID **Buffer
> + );
> +
> +///
> +/// This PPI is installed by some platform or chipset-
> specific PEIM that
> +/// abstracts handling microcode shadow support.
> +///
> +struct _EDKII_PEI_SHADOW_MICROCODE_PPI {
> + EDKII_PEI_SHADOW_MICROCODE ShadowMicrocode;
> +};
> +
> +extern EFI_GUID gEdkiiPeiShadowMicrocodePpiGuid;
> +
> +#endif
> +
> diff --git
> a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> index 9e6cce0895..45aaa179ff 100644
> --- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> @@ -69,6 +69,5 @@
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuMicrocodePatchRegionSiz
> e ## CONSUMES
> gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode
> ## CONSUMES
> gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate
> ## SOMETIMES_CONSUMES
> - gUefiCpuPkgTokenSpaceGuid.PcdCpuShadowMicrocodeByFit
> ## CONSUMES
> gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard
> ## CONSUMES
>
> diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> index b17e287bbf..dad5e22d22 100644
> --- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
> @@ -1,7 +1,7 @@
> /** @file
> MP initialize support functions for DXE phase.
>
> - Copyright (c) 2016 - 2019, Intel Corporation. All
> rights reserved.<BR>
> + Copyright (c) 2016 - 2020, Intel Corporation. All
> rights reserved.<BR>
> SPDX-License-Identifier: BSD-2-Clause-Patent
>
> **/
> @@ -816,3 +816,27 @@ MpInitLibEnableDisableAP (
>
> return Status;
> }
> +
> +/**
> + This funtion will try to invoke platform specific
> microcode shadow logic to
> + relocate microcode update patches into memory.
> +
> + @param[in] CpuMpData The pointer to CPU MP Data
> structure.
> +
> + @retval EFI_SUCCESS Shadow microcode
> success.
> + @retval EFI_OUT_OF_RESOURCES No enough resource
> to complete the operation.
> + @retval EFI_UNSUPPORTED Can't find platform
> specific microcode shadow
> + PPI/Protocol.
> +**/
> +EFI_STATUS
> +PlatformShadowMicrocode (
> + IN OUT CPU_MP_DATA *CpuMpData
> + )
> +{
> + //
> + // There is no DXE version of platform shadow
> microcode protocol so far.
> + // A platform which only uses DxeMpInitLib instance
> could only supports
> + // the PCD based microcode shadowing.
> + //
> + return EFI_UNSUPPORTED;
> +}
> diff --git a/UefiCpuPkg/Library/MpInitLib/Microcode.c
> b/UefiCpuPkg/Library/MpInitLib/Microcode.c
> index 67e214d463..15629591e2 100644
> --- a/UefiCpuPkg/Library/MpInitLib/Microcode.c
> +++ b/UefiCpuPkg/Library/MpInitLib/Microcode.c
> @@ -619,109 +619,6 @@ OnExit:
> return;
> }
>
> -/**
> - Shadow the required microcode patches data into
> memory according to FIT microcode entry.
> -
> - @param[in, out] CpuMpData The pointer to CPU MP
> Data structure.
> -
> - @return EFI_SUCCESS Microcode patch is
> shadowed into memory.
> - @return EFI_UNSUPPORTED FIT based microcode
> shadowing is not supported.
> - @return EFI_OUT_OF_RESOURCES No enough memory
> resource.
> - @return EFI_NOT_FOUND There is something
> wrong in FIT microcode entry.
> -
> -**/
> -EFI_STATUS
> -ShadowMicrocodePatchByFit (
> - IN OUT CPU_MP_DATA *CpuMpData
> - )
> -{
> - UINT64 FitPointer;
> - FIRMWARE_INTERFACE_TABLE_ENTRY *FitEntry;
> - UINT32 EntryNum;
> - UINT32 Index;
> - MICROCODE_PATCH_INFO *PatchInfoBuffer;
> - UINTN MaxPatchNumber;
> - CPU_MICROCODE_HEADER
> *MicrocodeEntryPoint;
> - UINTN PatchCount;
> - UINTN TotalSize;
> - UINTN TotalLoadSize;
> -
> - if (!FeaturePcdGet (PcdCpuShadowMicrocodeByFit)) {
> - return EFI_UNSUPPORTED;
> - }
> -
> - FitPointer = *(UINT64 *) (UINTN)
> FIT_POINTER_ADDRESS;
> - if ((FitPointer == 0) ||
> - (FitPointer == 0xFFFFFFFFFFFFFFFF) ||
> - (FitPointer == 0xEEEEEEEEEEEEEEEE)) {
> - //
> - // No FIT table.
> - //
> - ASSERT (FALSE);
> - return EFI_NOT_FOUND;
> - }
> - FitEntry = (FIRMWARE_INTERFACE_TABLE_ENTRY *)
> (UINTN) FitPointer;
> - if ((FitEntry[0].Type != FIT_TYPE_00_HEADER) ||
> - (FitEntry[0].Address != FIT_TYPE_00_SIGNATURE))
> {
> - //
> - // Invalid FIT table, treat it as no FIT table.
> - //
> - ASSERT (FALSE);
> - return EFI_NOT_FOUND;
> - }
> -
> - EntryNum = *(UINT32 *)(&FitEntry[0].Size[0]) &
> 0xFFFFFF;
> -
> - //
> - // Calculate microcode entry number
> - //
> - MaxPatchNumber = 0;
> - for (Index = 0; Index < EntryNum; Index++) {
> - if (FitEntry[Index].Type == FIT_TYPE_01_MICROCODE)
> {
> - MaxPatchNumber++;
> - }
> - }
> - if (MaxPatchNumber == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - PatchInfoBuffer = AllocatePool (MaxPatchNumber *
> sizeof (MICROCODE_PATCH_INFO));
> - if (PatchInfoBuffer == NULL) {
> - return EFI_OUT_OF_RESOURCES;
> - }
> -
> - //
> - // Fill up microcode patch info buffer according to
> FIT table.
> - //
> - PatchCount = 0;
> - TotalLoadSize = 0;
> - for (Index = 0; Index < EntryNum; Index++) {
> - if (FitEntry[Index].Type == FIT_TYPE_01_MICROCODE)
> {
> - MicrocodeEntryPoint = (CPU_MICROCODE_HEADER *)
> (UINTN) FitEntry[Index].Address;
> - TotalSize = (MicrocodeEntryPoint->DataSize == 0)
> ? 2048 : MicrocodeEntryPoint->TotalSize;
> - if (IsMicrocodePatchNeedLoad (CpuMpData,
> MicrocodeEntryPoint)) {
> - PatchInfoBuffer[PatchCount].Address =
> (UINTN) MicrocodeEntryPoint;
> - PatchInfoBuffer[PatchCount].Size =
> TotalSize;
> - TotalLoadSize += TotalSize;
> - PatchCount++;
> - }
> - }
> - }
> -
> - if (PatchCount != 0) {
> - DEBUG ((
> - DEBUG_INFO,
> - "%a: 0x%x microcode patches will be loaded into
> memory, with size 0x%x.\n",
> - __FUNCTION__, PatchCount, TotalLoadSize
> - ));
> -
> - ShadowMicrocodePatchWorker (CpuMpData,
> PatchInfoBuffer, PatchCount, TotalLoadSize);
> - }
> -
> - FreePool (PatchInfoBuffer);
> - return EFI_SUCCESS;
> -}
> -
> /**
> Shadow the required microcode patches data into
> memory.
>
> @@ -734,7 +631,7 @@ ShadowMicrocodeUpdatePatch (
> {
> EFI_STATUS Status;
>
> - Status = ShadowMicrocodePatchByFit (CpuMpData);
> + Status = PlatformShadowMicrocode (CpuMpData);
> if (EFI_ERROR (Status)) {
> ShadowMicrocodePatchByPcd (CpuMpData);
> }
> diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h
> b/UefiCpuPkg/Library/MpInitLib/MpLib.h
> index a6eab5f3d7..455cb3f09a 100644
> --- a/UefiCpuPkg/Library/MpInitLib/MpLib.h
> +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h
> @@ -31,9 +31,6 @@
>
> #include <Guid/MicrocodePatchHob.h>
>
> -#include <IndustryStandard/FirmwareInterfaceTable.h>
> -
> -
> #define WAKEUP_AP_SIGNAL SIGNATURE_32 ('S', 'T', 'A',
> 'P')
>
> #define CPU_INIT_MP_LIB_HOB_GUID \
> @@ -657,5 +654,21 @@ GetProcessorNumber (
> OUT UINTN *ProcessorNumber
> );
>
> +/**
> + This funtion will try to invoke platform specific
> microcode shadow logic to
> + relocate microcode update patches into memory.
> +
> + @param[in] CpuMpData The pointer to CPU MP Data
> structure.
> +
> + @retval EFI_SUCCESS Shadow microcode
> success.
> + @retval EFI_OUT_OF_RESOURCES No enough resource
> to complete the operation.
> + @retval EFI_UNSUPPORTED Can't find platform
> specific microcode shadow
> + PPI/Protocol.
> +**/
> +EFI_STATUS
> +PlatformShadowMicrocode (
> + IN OUT CPU_MP_DATA *CpuMpData
> + );
> +
> #endif
>
> diff --git
> a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> index 555125a7c5..d78d328b42 100644
> --- a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> +++ b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> @@ -60,7 +60,9 @@
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuMicrocodePatchRegionSiz
> e ## CONSUMES
> gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode
> ## CONSUMES
> gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate
> ## SOMETIMES_CONSUMES
> - gUefiCpuPkgTokenSpaceGuid.PcdCpuShadowMicrocodeByFit
> ## CONSUMES
> +
> +[Ppis]
> + gEdkiiPeiShadowMicrocodePpiGuid ##
> SOMETIMES_CONSUMES
>
> [Guids]
> gEdkiiS3SmmInitDoneGuid
> diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> index 6ecbed39ec..17b60903c5 100644
> --- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> @@ -9,6 +9,7 @@
> #include "MpLib.h"
> #include <Library/PeiServicesLib.h>
> #include <Guid/S3SmmInitDone.h>
> +#include <Ppi/ShadowMicrocode.h>
>
> /**
> S3 SMM Init Done notification function.
> @@ -639,4 +640,71 @@ MpInitLibEnableDisableAP (
> return EnableDisableApWorker (ProcessorNumber,
> EnableAP, HealthFlag);
> }
>
> +/**
> + This funtion will try to invoke platform specific
> microcode shadow logic to
> + relocate microcode update patches into memory.
> +
> + @param[in] CpuMpData The pointer to CPU MP Data
> structure.
>
> + @retval EFI_SUCCESS Shadow microcode
> success.
> + @retval EFI_OUT_OF_RESOURCES No enough resource
> to complete the operation.
> + @retval EFI_UNSUPPORTED Can't find platform
> specific microcode shadow
> + PPI/Protocol.
> +**/
> +EFI_STATUS
> +PlatformShadowMicrocode (
> + IN OUT CPU_MP_DATA *CpuMpData
> + )
> +{
> + EFI_STATUS Status;
> + EDKII_PEI_SHADOW_MICROCODE_PPI
> *ShadowMicrocodePpi;
> + UINTN CpuCount;
> + EDKII_PEI_MICROCODE_CPU_ID *MicrocodeCpuId;
> + UINTN Index;
> + UINTN BufferSize;
> + VOID *Buffer;
> +
> + Status = PeiServicesLocatePpi (
> + &gEdkiiPeiShadowMicrocodePpiGuid,
> + 0,
> + NULL,
> + (VOID **) &ShadowMicrocodePpi
> + );
> + if (EFI_ERROR (Status)) {
> + return EFI_UNSUPPORTED;
> + }
> +
> + CpuCount = CpuMpData->CpuCount;
> + MicrocodeCpuId = (EDKII_PEI_MICROCODE_CPU_ID *)
> AllocateZeroPool (sizeof (EDKII_PEI_MICROCODE_CPU_ID) *
> CpuCount);
> + if (MicrocodeCpuId == NULL) {
> + return EFI_OUT_OF_RESOURCES;
> + }
> +
> + for (Index = 0; Index < CpuMpData->CpuCount;
> Index++) {
> + MicrocodeCpuId[Index].ProcessorSignature =
> CpuMpData->CpuData[Index].ProcessorSignature;
> + MicrocodeCpuId[Index].PlatformId =
> CpuMpData->CpuData[Index].PlatformId;
> + }
> +
> + Status = ShadowMicrocodePpi->ShadowMicrocode (
> + ShadowMicrocodePpi,
> + CpuCount,
> + MicrocodeCpuId,
> + &BufferSize,
> + &Buffer
> + );
> + FreePool (MicrocodeCpuId);
> + if (EFI_ERROR (Status)) {
> + return EFI_NOT_FOUND;
> + }
> +
> + CpuMpData->MicrocodePatchAddress = (UINTN)
> Buffer;
> + CpuMpData->MicrocodePatchRegionSize = BufferSize;
> +
> + DEBUG ((
> + DEBUG_INFO,
> + "%a: Required microcode patches have been loaded
> at 0x%lx, with size 0x%lx.\n",
> + __FUNCTION__, CpuMpData->MicrocodePatchAddress,
> CpuMpData->MicrocodePatchRegionSize
> + ));
> +
> + return EFI_SUCCESS;
> +}
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec
> b/UefiCpuPkg/UefiCpuPkg.dec
> index a6ebdde1cf..e91dc68cbe 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -1,7 +1,7 @@
> ## @file UefiCpuPkg.dec
> # This Package provides UEFI compatible CPU modules
> and libraries.
> #
> -# Copyright (c) 2007 - 2019, Intel Corporation. All
> rights reserved.<BR>
> +# Copyright (c) 2007 - 2020, Intel Corporation. All
> rights reserved.<BR>
> #
> # SPDX-License-Identifier: BSD-2-Clause-Patent
> #
> @@ -81,6 +81,9 @@
> [Ppis]
> gEdkiiPeiMpServices2PpiGuid = { 0x5cb9cb3d,
> 0x31a4, 0x480c, { 0x94, 0x98, 0x29, 0xd2, 0x69, 0xba,
> 0xcf, 0xba}}
>
> + ## Include/Ppi/ShadowMicrocode.h
> + gEdkiiPeiShadowMicrocodePpiGuid = { 0x430f6965,
> 0x9a69, 0x41c5, { 0x93, 0xed, 0x8b, 0xf0, 0x64, 0x35,
> 0xc1, 0xc6 }}
> +
> [PcdsFeatureFlag]
> ## Indicates if SMM Profile will be enabled.
> # If enabled, instruction executions in and data
> accesses to memory outside of SMRAM will be logged.
> @@ -139,12 +142,6 @@
> # @Prompt Lock SMM Feature Control MSR.
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmFeatureControlMsrLoc
> k|TRUE|BOOLEAN|0x3213210B
>
> - ## Indicates if FIT based microcode shadowing will
> be enabled.<BR><BR>
> - # TRUE - FIT base microcode shadowing will be
> enabled.<BR>
> - # FALSE - FIT base microcode shadowing will be
> disabled.<BR>
> - # @Prompt FIT based microcode shadowing.
> -
> gUefiCpuPkgTokenSpaceGuid.PcdCpuShadowMicrocodeByFit|FA
> LSE|BOOLEAN|0x3213210D
> -
> [PcdsFixedAtBuild]
> ## List of exception vectors which need switching
> stack.
> # This PCD will only take into effect if
> PcdCpuStackGuard is enabled.
> diff --git a/UefiCpuPkg/UefiCpuPkg.uni
> b/UefiCpuPkg/UefiCpuPkg.uni
> index 2db49e841b..c0d6ed5136 100644
> --- a/UefiCpuPkg/UefiCpuPkg.uni
> +++ b/UefiCpuPkg/UefiCpuPkg.uni
> @@ -100,12 +100,6 @@
>
> "TRUE - locked.<BR>\n"
>
> "FALSE - unlocked.<BR>"
>
> -#string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuShadowMicrocodeByFi
> t_PROMPT #language en-US "FIT based microcode
> shadowing"
> -
> -#string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuShadowMicrocodeByFi
> t_HELP #language en-US "Indicates if FIT based
> microcode shadowing will be enabled.<BR><BR>\n"
> -
> "TRUE - FIT base microcode shadowing will be
> enabled.<BR>\n"
> -
> "FALSE - FIT base microcode shadowing will be
> disabled.<BR>"
> -
> #string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdPeiTemporaryRamStackSi
> ze_PROMPT #language en-US "Stack size in the temporary
> RAM"
>
> #string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdPeiTemporaryRamStackSi
> ze_HELP #language en-US "Specifies stack size in the
> temporary RAM. 0 means half of TemporaryRamSize."
> --
> 2.19.1.windows.1
>
>
>
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