[edk2-devel] [PATCH v9 8/9] UefiCpuPkg: Removes SmmCpuFeaturesReadSaveStateRegister
Chang, Abner via groups.io
abner.chang=amd.com at groups.io
Sat Apr 29 07:37:39 UTC 2023
[AMD Official Use Only - General]
Reviewed-by: Abner Chang <abner.chang at amd.com>
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Abdul
> Lateef Attar via groups.io
> Sent: Wednesday, April 26, 2023 3:22 PM
> To: devel at edk2.groups.io
> Cc: Attar, AbdulLateef (Abdul Lateef) <AbdulLateef.Attar at amd.com>;
> Grimes, Paul <Paul.Grimes at amd.com>; Garrett Kirkendall
> <garrett.kirkendall at amd.com>; Chang, Abner <Abner.Chang at amd.com>;
> Eric Dong <eric.dong at intel.com>; Ray Ni <ray.ni at intel.com>; Rahul Kumar
> <rahul1.kumar at intel.com>; Gerd Hoffmann <kraxel at redhat.com>; Ard
> Biesheuvel <ardb+tianocore at kernel.org>; Jiewen Yao
> <jiewen.yao at intel.com>; Jordan Justen <jordan.l.justen at intel.com>
> Subject: [edk2-devel] [PATCH v9 8/9] UefiCpuPkg: Removes
> SmmCpuFeaturesReadSaveStateRegister
>
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4182
>
> Removes SmmCpuFeaturesReadSaveStateRegister and
> SmmCpuFeaturesWirteSaveStateRegister
> function from SmmCpuFeaturesLib library.
>
> MmSaveStateLib library replaces the functionality of the above functions.
> Platform old/new need to use MmSaveStateLib library to read/write save
> state registers.
> Current implementation supports Intel, AMD and Ovmf/Qemu.
>
> Cc: Paul Grimes <paul.grimes at amd.com>
> Cc: Garrett Kirkendall <garrett.kirkendall at amd.com>
> Cc: Abner Chang <abner.chang at amd.com>
> Cc: Eric Dong <eric.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Rahul Kumar <rahul1.kumar at intel.com>
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
> Cc: Jiewen Yao <jiewen.yao at intel.com>
> Cc: Jordan Justen <jordan.l.justen at intel.com>
> Signed-off-by: Abdul Lateef Attar <abdattar at amd.com>
> ---
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf | 2 +
> .../Include/Library/SmmCpuFeaturesLib.h | 52 --
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 56 +-
> .../SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c | 58 --
> .../IntelSmmCpuFeaturesLib.c | 58 --
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 11 +-
> UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c | 500 +-----------------
> 7 files changed, 9 insertions(+), 728 deletions(-)
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> index 158e05e2646c..bd83b4afab26 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> @@ -6,6 +6,7 @@
> #
> # Copyright (c) 2009 - 2023, Intel Corporation. All rights reserved.<BR> #
> Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> +# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights
> +reserved.<BR>
> #
> # SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -97,6 +98,7 @@
> [LibraryClasses]
> ReportStatusCodeLib
> SmmCpuFeaturesLib
> PeCoffGetEntryPointLib
> + MmSaveStateLib
>
> [Protocols]
> gEfiSmmAccess2ProtocolGuid ## CONSUMES
> diff --git a/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h
> b/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h
> index 52160c7145ba..733f0d03ebaa 100644
> --- a/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h
> +++ b/UefiCpuPkg/Include/Library/SmmCpuFeaturesLib.h
> @@ -324,58 +324,6 @@ SmmCpuFeaturesSetSmmRegister (
> IN UINT64 Value
> );
>
> -/**
> - Read an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for reading the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to read the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to read.
> - @param[in] Width The number of bytes to read from the CPU save state.
> - @param[out] Buffer Upon return, this holds the CPU register value read
> - from the save state.
> -
> - @retval EFI_SUCCESS The register was read from Save State.
> - @retval EFI_INVALID_PARAMETER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support reading
> Register.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesReadSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - );
> -
> -/**
> - Writes an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for writing the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to write the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to write.
> - @param[in] Width The number of bytes to write to the CPU save state.
> - @param[in] Buffer Upon entry, this holds the new CPU register value.
> -
> - @retval EFI_SUCCESS The register was written to Save State.
> - @retval EFI_INVALID_PARAMETER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support writing
> Register.
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesWriteSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - IN CONST VOID *Buffer
> - );
> -
> /**
> This function is hook point called after the
> gEfiSmmReadyToLockProtocolGuid
> notification is completely processed.
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> index a5c2bdd971ca..106808b08e17 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> @@ -3,6 +3,7 @@ Agent Module to load other modules to deploy SMM
> Entry Vector for X86 CPU.
>
> Copyright (c) 2009 - 2023, Intel Corporation. All rights reserved.<BR>
> Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> +Copyright (C) 2023 Advanced Micro Devices, Inc. All rights
> +reserved.<BR>
>
> SPDX-License-Identifier: BSD-2-Clause-Patent
>
> @@ -50,6 +51,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent #include
> <Library/SmmCpuFeaturesLib.h> #include
> <Library/PeCoffGetEntryPointLib.h>
> #include <Library/RegisterCpuFeaturesLib.h>
> +#include <Library/MmSaveStateLib.h>
>
> #include <AcpiCpuData.h>
> #include <CpuHotPlugData.h>
> @@ -367,60 +369,6 @@ ExecuteFirstSmiInit (
> VOID
> );
>
> -/**
> -Read a CPU Save State register on the target processor.
> -
> -This function abstracts the differences that whether the CPU Save State
> register is in the
> -IA32 CPU Save State Map or X64 CPU Save State Map.
> -
> -This function supports reading a CPU Save State register in SMBase
> relocation handler.
> -
> - at param[in] CpuIndex Specifies the zero-based index of the CPU save
> state.
> - at param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up
> table.
> - at param[in] Width The number of bytes to read from the CPU save
> state.
> - at param[out] Buffer Upon return, this holds the CPU register value read
> from the save state.
> -
> - at retval EFI_SUCCESS The register was read from Save State.
> - at retval EFI_NOT_FOUND The register is not defined for the Save State
> of Processor.
> - at retval EFI_INVALID_PARAMETER Buffer is NULL, or Width does not meet
> requirement per Register type.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -ReadSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - );
> -
> -/**
> -Write value to a CPU Save State register on the target processor.
> -
> -This function abstracts the differences that whether the CPU Save State
> register is in the
> -IA32 CPU Save State Map or X64 CPU Save State Map.
> -
> -This function supports writing a CPU Save State register in SMBase
> relocation handler.
> -
> - at param[in] CpuIndex Specifies the zero-based index of the CPU save
> state.
> - at param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up
> table.
> - at param[in] Width The number of bytes to read from the CPU save
> state.
> - at param[in] Buffer Upon entry, this holds the new CPU register value.
> -
> - at retval EFI_SUCCESS The register was written to Save State.
> - at retval EFI_NOT_FOUND The register is not defined for the Save State
> of Processor.
> - at retval EFI_INVALID_PARAMETER ProcessorIndex or Width is not correct.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -WriteSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - IN CONST VOID *Buffer
> - );
> -
> extern BOOLEAN mSmmRelocated;
> extern volatile BOOLEAN *mSmmInitialized;
> extern UINT32 mBspApicId;
> diff --git
> a/UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c
> b/UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c
> index 1473f0a51fe2..e6d1b5010356 100644
> --- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c
> +++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/AmdSmmCpuFeaturesLib.c
> @@ -27,64 +27,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent // The
> mode of the CPU at the time an SMI occurs STATIC UINT8
> mSmmSaveStateRegisterLma;
>
> -/**
> - Read an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for reading the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to read the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to read.
> - @param[in] Width The number of bytes to read from the CPU save state.
> - @param[out] Buffer Upon return, this holds the CPU register value read
> - from the save state.
> -
> - @retval EFI_SUCCESS The register was read from Save State.
> - @retval EFI_INVALID_PARAMTER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support reading
> Register.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesReadSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - )
> -{
> - return MmSaveStateReadRegister (CpuIndex, Register, Width, Buffer); -}
> -
> -/**
> - Writes an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for writing the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to write the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to write.
> - @param[in] Width The number of bytes to write to the CPU save state.
> - @param[in] Buffer Upon entry, this holds the new CPU register value.
> -
> - @retval EFI_SUCCESS The register was written to Save State.
> - @retval EFI_INVALID_PARAMTER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support writing
> Register.
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesWriteSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - IN CONST VOID *Buffer
> - )
> -{
> - return MmSaveStateWriteRegister (CpuIndex, Register, Width, Buffer); -}
> -
> /**
> Performs library initialization.
>
> diff --git
> a/UefiCpuPkg/Library/SmmCpuFeaturesLib/IntelSmmCpuFeaturesLib.c
> b/UefiCpuPkg/Library/SmmCpuFeaturesLib/IntelSmmCpuFeaturesLib.c
> index 8f382b60266c..950056a7143d 100644
> --- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/IntelSmmCpuFeaturesLib.c
> +++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/IntelSmmCpuFeaturesLib.c
> @@ -461,64 +461,6 @@ SmmCpuFeaturesHookReturnFromSmm (
> return 0;
> }
>
> -/**
> - Read an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for reading the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to read the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to read.
> - @param[in] Width The number of bytes to read from the CPU save state.
> - @param[out] Buffer Upon return, this holds the CPU register value read
> - from the save state.
> -
> - @retval EFI_SUCCESS The register was read from Save State.
> - @retval EFI_INVALID_PARAMETER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support reading
> Register.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesReadSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - )
> -{
> - return EFI_UNSUPPORTED;
> -}
> -
> -/**
> - Writes an SMM Save State register on the target processor. If this function
> - returns EFI_UNSUPPORTED, then the caller is responsible for writing the
> - SMM Save Sate register.
> -
> - @param[in] CpuIndex The index of the CPU to write the SMM Save State.
> The
> - value must be between 0 and the NumberOfCpus field in
> - the System Management System Table (SMST).
> - @param[in] Register The SMM Save State register to write.
> - @param[in] Width The number of bytes to write to the CPU save state.
> - @param[in] Buffer Upon entry, this holds the new CPU register value.
> -
> - @retval EFI_SUCCESS The register was written to Save State.
> - @retval EFI_INVALID_PARAMETER Buffer is NULL.
> - @retval EFI_UNSUPPORTED This function does not support writing
> Register.
> -**/
> -EFI_STATUS
> -EFIAPI
> -SmmCpuFeaturesWriteSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - IN CONST VOID *Buffer
> - )
> -{
> - return EFI_UNSUPPORTED;
> -}
> -
> /**
> Check to see if an SMM register is supported by a specified CPU.
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> index c0e368ea9475..ec191be858af 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
> @@ -3,6 +3,7 @@ Agent Module to load other modules to deploy SMM
> Entry Vector for X86 CPU.
>
> Copyright (c) 2009 - 2023, Intel Corporation. All rights reserved.<BR>
> Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> +Copyright (C) 2023 Advanced Micro Devices, Inc. All rights
> +reserved.<BR>
>
> SPDX-License-Identifier: BSD-2-Clause-Patent
>
> @@ -276,10 +277,7 @@ SmmReadSaveState (
> return EFI_INVALID_PARAMETER;
> }
>
> - Status = SmmCpuFeaturesReadSaveStateRegister (CpuIndex, Register,
> Width, Buffer);
> - if (Status == EFI_UNSUPPORTED) {
> - Status = ReadSaveStateRegister (CpuIndex, Register, Width, Buffer);
> - }
> + Status = MmSaveStateReadRegister (CpuIndex, Register, Width, Buffer);
>
> return Status;
> }
> @@ -328,10 +326,7 @@ SmmWriteSaveState (
> return EFI_INVALID_PARAMETER;
> }
>
> - Status = SmmCpuFeaturesWriteSaveStateRegister (CpuIndex, Register,
> Width, Buffer);
> - if (Status == EFI_UNSUPPORTED) {
> - Status = WriteSaveStateRegister (CpuIndex, Register, Width, Buffer);
> - }
> + Status = MmSaveStateWriteRegister (CpuIndex, Register, Width,
> + Buffer);
>
> return Status;
> }
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c
> index c8ddc6083df6..1e316ee0acdb 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c
> @@ -2,6 +2,8 @@
> Provides services to access SMRAM Save State Map
>
> Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
> +Copyright (C) 2023 Advanced Micro Devices, Inc. All rights
> +reserved.<BR>
> +
> SPDX-License-Identifier: BSD-2-Clause-Patent
>
> **/
> @@ -48,52 +50,6 @@ extern CONST PROCESSOR_SMM_DESCRIPTOR gcPsd;
> // #define LMA BIT10
>
> -///
> -/// Macro used to simplify the lookup table entries of type
> CPU_SMM_SAVE_STATE_LOOKUP_ENTRY -/// -#define
> SMM_CPU_OFFSET(Field) OFFSET_OF (SMRAM_SAVE_STATE_MAP, Field)
> -
> -///
> -/// Macro used to simplify the lookup table entries of type
> CPU_SMM_SAVE_STATE_REGISTER_RANGE -/// -#define
> SMM_REGISTER_RANGE(Start, End) { Start, End, End - Start + 1 }
> -
> -///
> -/// Structure used to describe a range of registers -/// -typedef struct {
> - EFI_SMM_SAVE_STATE_REGISTER Start;
> - EFI_SMM_SAVE_STATE_REGISTER End;
> - UINTN Length;
> -} CPU_SMM_SAVE_STATE_REGISTER_RANGE;
> -
> -///
> -/// Structure used to build a lookup table to retrieve the widths and offsets -
> /// associated with each supported EFI_SMM_SAVE_STATE_REGISTER value
> -///
> -
> -#define SMM_SAVE_STATE_REGISTER_SMMREVID_INDEX 1
> -#define SMM_SAVE_STATE_REGISTER_IOMISC_INDEX 2
> -#define SMM_SAVE_STATE_REGISTER_IOMEMADDR_INDEX 3
> -#define SMM_SAVE_STATE_REGISTER_MAX_INDEX 4
> -
> -typedef struct {
> - UINT8 Width32;
> - UINT8 Width64;
> - UINT16 Offset32;
> - UINT16 Offset64Lo;
> - UINT16 Offset64Hi;
> - BOOLEAN Writeable;
> -} CPU_SMM_SAVE_STATE_LOOKUP_ENTRY;
> -
> -///
> -/// Structure used to build a lookup table for the IOMisc width information -
> /// -typedef struct {
> - UINT8 Width;
> - EFI_SMM_SAVE_STATE_IO_WIDTH IoWidth;
> -} CPU_SMM_SAVE_STATE_IO_WIDTH;
> -
> ///
> /// Variables from SMI Handler
> ///
> @@ -108,463 +64,11 @@ extern CONST UINT16 gcSmiHandlerSize;
> //
> IA32_DESCRIPTOR gSmiHandlerIdtr;
>
> -///
> -/// Table used by GetRegisterIndex() to convert an
> EFI_SMM_SAVE_STATE_REGISTER -/// value to an index into a table of type
> CPU_SMM_SAVE_STATE_LOOKUP_ENTRY -/// -CONST
> CPU_SMM_SAVE_STATE_REGISTER_RANGE mSmmCpuRegisterRanges[] = {
> - SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_GDTBASE,
> EFI_SMM_SAVE_STATE_REGISTER_LDTINFO),
> - SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_ES,
> EFI_SMM_SAVE_STATE_REGISTER_RIP),
> - SMM_REGISTER_RANGE (EFI_SMM_SAVE_STATE_REGISTER_RFLAGS,
> EFI_SMM_SAVE_STATE_REGISTER_CR4),
> - { (EFI_SMM_SAVE_STATE_REGISTER)0,
> (EFI_SMM_SAVE_STATE_REGISTER)0, 0}
> -};
> -
> -///
> -/// Lookup table used to retrieve the widths and offsets associated with
> each -/// supported EFI_SMM_SAVE_STATE_REGISTER value -/// -CONST
> CPU_SMM_SAVE_STATE_LOOKUP_ENTRY mSmmCpuWidthOffset[] = {
> - { 0, 0, 0, 0, 0, FALSE }, //
> Reserved
> -
> - //
> - // Internally defined CPU Save State Registers. Not defined in PI SMM CPU
> Protocol.
> - //
> - { 4, 4, SMM_CPU_OFFSET (x86.SMMRevId), SMM_CPU_OFFSET
> (x64.SMMRevId), 0, FALSE }, //
> SMM_SAVE_STATE_REGISTER_SMMREVID_INDEX = 1
> - { 4, 4, SMM_CPU_OFFSET (x86.IOMisc), SMM_CPU_OFFSET (x64.IOMisc),
> 0, FALSE }, // SMM_SAVE_STATE_REGISTER_IOMISC_INDEX
> = 2
> - { 4, 8, SMM_CPU_OFFSET (x86.IOMemAddr), SMM_CPU_OFFSET
> (x64.IOMemAddr), SMM_CPU_OFFSET (x64.IOMemAddr) + 4, FALSE }, //
> SMM_SAVE_STATE_REGISTER_IOMEMADDR_INDEX = 3
> -
> - //
> - // CPU Save State registers defined in PI SMM CPU Protocol.
> - //
> - { 0, 8, 0, SMM_CPU_OFFSET (x64.GdtBaseLoDword),
> SMM_CPU_OFFSET (x64.GdtBaseHiDword), FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_GDTBASE = 4
> - { 0, 8, 0, SMM_CPU_OFFSET (x64.IdtBaseLoDword),
> SMM_CPU_OFFSET (x64.IdtBaseHiDword), FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_IDTBASE = 5
> - { 0, 8, 0, SMM_CPU_OFFSET (x64.LdtBaseLoDword),
> SMM_CPU_OFFSET (x64.LdtBaseHiDword), FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_LDTBASE = 6
> - { 0, 0, 0, 0, 0, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_GDTLIMIT = 7
> - { 0, 0, 0, 0, 0, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_IDTLIMIT = 8
> - { 0, 0, 0, 0, 0, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_LDTLIMIT = 9
> - { 0, 0, 0, 0, 0, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_LDTINFO = 10
> -
> - { 4, 4, SMM_CPU_OFFSET (x86._ES), SMM_CPU_OFFSET (x64._ES),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_ES = 20
> - { 4, 4, SMM_CPU_OFFSET (x86._CS), SMM_CPU_OFFSET (x64._CS),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_CS = 21
> - { 4, 4, SMM_CPU_OFFSET (x86._SS), SMM_CPU_OFFSET (x64._SS),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_SS = 22
> - { 4, 4, SMM_CPU_OFFSET (x86._DS), SMM_CPU_OFFSET (x64._DS),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_DS = 23
> - { 4, 4, SMM_CPU_OFFSET (x86._FS), SMM_CPU_OFFSET (x64._FS),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_FS = 24
> - { 4, 4, SMM_CPU_OFFSET (x86._GS), SMM_CPU_OFFSET (x64._GS),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_GS = 25
> - { 0, 4, 0, SMM_CPU_OFFSET (x64._LDTR), 0,
> FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_LDTR_SEL = 26
> - { 4, 4, SMM_CPU_OFFSET (x86._TR), SMM_CPU_OFFSET (x64._TR),
> 0, FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_TR_SEL =
> 27
> - { 4, 8, SMM_CPU_OFFSET (x86._DR7), SMM_CPU_OFFSET (x64._DR7),
> SMM_CPU_OFFSET (x64._DR7) + 4, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_DR7 = 28
> - { 4, 8, SMM_CPU_OFFSET (x86._DR6), SMM_CPU_OFFSET (x64._DR6),
> SMM_CPU_OFFSET (x64._DR6) + 4, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_DR6 = 29
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R8),
> SMM_CPU_OFFSET (x64._R8) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R8 = 30
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R9),
> SMM_CPU_OFFSET (x64._R9) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R9 = 31
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R10),
> SMM_CPU_OFFSET (x64._R10) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R10 = 32
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R11),
> SMM_CPU_OFFSET (x64._R11) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R11 = 33
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R12),
> SMM_CPU_OFFSET (x64._R12) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R12 = 34
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R13),
> SMM_CPU_OFFSET (x64._R13) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R13 = 35
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R14),
> SMM_CPU_OFFSET (x64._R14) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R14 = 36
> - { 0, 8, 0, SMM_CPU_OFFSET (x64._R15),
> SMM_CPU_OFFSET (x64._R15) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_R15 = 37
> - { 4, 8, SMM_CPU_OFFSET (x86._EAX), SMM_CPU_OFFSET (x64._RAX),
> SMM_CPU_OFFSET (x64._RAX) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RAX = 38
> - { 4, 8, SMM_CPU_OFFSET (x86._EBX), SMM_CPU_OFFSET (x64._RBX),
> SMM_CPU_OFFSET (x64._RBX) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RBX = 39
> - { 4, 8, SMM_CPU_OFFSET (x86._ECX), SMM_CPU_OFFSET (x64._RCX),
> SMM_CPU_OFFSET (x64._RCX) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RCX = 40
> - { 4, 8, SMM_CPU_OFFSET (x86._EDX), SMM_CPU_OFFSET (x64._RDX),
> SMM_CPU_OFFSET (x64._RDX) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RDX = 41
> - { 4, 8, SMM_CPU_OFFSET (x86._ESP), SMM_CPU_OFFSET (x64._RSP),
> SMM_CPU_OFFSET (x64._RSP) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RSP = 42
> - { 4, 8, SMM_CPU_OFFSET (x86._EBP), SMM_CPU_OFFSET (x64._RBP),
> SMM_CPU_OFFSET (x64._RBP) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RBP = 43
> - { 4, 8, SMM_CPU_OFFSET (x86._ESI), SMM_CPU_OFFSET (x64._RSI),
> SMM_CPU_OFFSET (x64._RSI) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RSI = 44
> - { 4, 8, SMM_CPU_OFFSET (x86._EDI), SMM_CPU_OFFSET (x64._RDI),
> SMM_CPU_OFFSET (x64._RDI) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RDI = 45
> - { 4, 8, SMM_CPU_OFFSET (x86._EIP), SMM_CPU_OFFSET (x64._RIP),
> SMM_CPU_OFFSET (x64._RIP) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RIP = 46
> -
> - { 4, 8, SMM_CPU_OFFSET (x86._EFLAGS), SMM_CPU_OFFSET
> (x64._RFLAGS), SMM_CPU_OFFSET (x64._RFLAGS) + 4, TRUE }, //
> EFI_SMM_SAVE_STATE_REGISTER_RFLAGS = 51
> - { 4, 8, SMM_CPU_OFFSET (x86._CR0), SMM_CPU_OFFSET (x64._CR0),
> SMM_CPU_OFFSET (x64._CR0) + 4, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_CR0 = 52
> - { 4, 8, SMM_CPU_OFFSET (x86._CR3), SMM_CPU_OFFSET (x64._CR3),
> SMM_CPU_OFFSET (x64._CR3) + 4, FALSE }, //
> EFI_SMM_SAVE_STATE_REGISTER_CR3 = 53
> - { 0, 4, 0, SMM_CPU_OFFSET (x64._CR4), 0,
> FALSE }, // EFI_SMM_SAVE_STATE_REGISTER_CR4 = 54
> -};
> -
> -///
> -/// Lookup table for the IOMisc width information -/// -CONST
> CPU_SMM_SAVE_STATE_IO_WIDTH mSmmCpuIoWidth[] = {
> - { 0, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 }, // Undefined = 0
> - { 1, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 }, //
> SMM_IO_LENGTH_BYTE = 1
> - { 2, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT16 }, //
> SMM_IO_LENGTH_WORD = 2
> - { 0, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 }, // Undefined = 3
> - { 4, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT32 }, //
> SMM_IO_LENGTH_DWORD = 4
> - { 0, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 }, // Undefined = 5
> - { 0, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 }, // Undefined = 6
> - { 0, EFI_SMM_SAVE_STATE_IO_WIDTH_UINT8 } // Undefined = 7
> -};
> -
> -///
> -/// Lookup table for the IOMisc type information -/// -CONST
> EFI_SMM_SAVE_STATE_IO_TYPE mSmmCpuIoType[] = {
> - EFI_SMM_SAVE_STATE_IO_TYPE_OUTPUT, // SMM_IO_TYPE_OUT_DX
> = 0
> - EFI_SMM_SAVE_STATE_IO_TYPE_INPUT, // SMM_IO_TYPE_IN_DX
> = 1
> - EFI_SMM_SAVE_STATE_IO_TYPE_STRING, // SMM_IO_TYPE_OUTS
> = 2
> - EFI_SMM_SAVE_STATE_IO_TYPE_STRING, // SMM_IO_TYPE_INS =
> 3
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 4
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 5
> - EFI_SMM_SAVE_STATE_IO_TYPE_REP_PREFIX, //
> SMM_IO_TYPE_REP_OUTS = 6
> - EFI_SMM_SAVE_STATE_IO_TYPE_REP_PREFIX, // SMM_IO_TYPE_REP_INS
> = 7
> - EFI_SMM_SAVE_STATE_IO_TYPE_OUTPUT, //
> SMM_IO_TYPE_OUT_IMMEDIATE = 8
> - EFI_SMM_SAVE_STATE_IO_TYPE_INPUT, //
> SMM_IO_TYPE_OUT_IMMEDIATE = 9
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 10
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 11
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 12
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 13
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0, // Undefined = 14
> - (EFI_SMM_SAVE_STATE_IO_TYPE)0 // Undefined = 15
> -};
> -
> ///
> /// The mode of the CPU at the time an SMI occurs ///
> UINT8 mSmmSaveStateRegisterLma;
>
> -/**
> - Read information from the CPU save state.
> -
> - @param Register Specifies the CPU register to read form the save state.
> -
> - @retval 0 Register is not valid
> - @retval >0 Index into mSmmCpuWidthOffset[] associated with Register
> -
> -**/
> -UINTN
> -GetRegisterIndex (
> - IN EFI_SMM_SAVE_STATE_REGISTER Register
> - )
> -{
> - UINTN Index;
> - UINTN Offset;
> -
> - for (Index = 0, Offset = SMM_SAVE_STATE_REGISTER_MAX_INDEX;
> mSmmCpuRegisterRanges[Index].Length != 0; Index++) {
> - if ((Register >= mSmmCpuRegisterRanges[Index].Start) && (Register <=
> mSmmCpuRegisterRanges[Index].End)) {
> - return Register - mSmmCpuRegisterRanges[Index].Start + Offset;
> - }
> -
> - Offset += mSmmCpuRegisterRanges[Index].Length;
> - }
> -
> - return 0;
> -}
> -
> -/**
> - Read a CPU Save State register on the target processor.
> -
> - This function abstracts the differences that whether the CPU Save State
> register is in the
> - IA32 CPU Save State Map or X64 CPU Save State Map.
> -
> - This function supports reading a CPU Save State register in SMBase
> relocation handler.
> -
> - @param[in] CpuIndex Specifies the zero-based index of the CPU save
> state.
> - @param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up
> table.
> - @param[in] Width The number of bytes to read from the CPU save
> state.
> - @param[out] Buffer Upon return, this holds the CPU register value
> read from the save state.
> -
> - @retval EFI_SUCCESS The register was read from Save State.
> - @retval EFI_NOT_FOUND The register is not defined for the Save State
> of Processor.
> - @retval EFI_INVALID_PARAMETER This or Buffer is NULL.
> -
> -**/
> -EFI_STATUS
> -ReadSaveStateRegisterByIndex (
> - IN UINTN CpuIndex,
> - IN UINTN RegisterIndex,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - )
> -{
> - SMRAM_SAVE_STATE_MAP *CpuSaveState;
> -
> - if (RegisterIndex == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - CpuSaveState = gSmst->CpuSaveState[CpuIndex];
> -
> - if (mSmmSaveStateRegisterLma ==
> EFI_SMM_SAVE_STATE_REGISTER_LMA_32BIT) {
> - //
> - // If 32-bit mode width is zero, then the specified register can not be
> accessed
> - //
> - if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // If Width is bigger than the 32-bit mode width, then the specified
> register can not be accessed
> - //
> - if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - //
> - // Write return buffer
> - //
> - ASSERT (CpuSaveState != NULL);
> - CopyMem (Buffer, (UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset32, Width);
> - } else {
> - //
> - // If 64-bit mode width is zero, then the specified register can not be
> accessed
> - //
> - if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // If Width is bigger than the 64-bit mode width, then the specified
> register can not be accessed
> - //
> - if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - //
> - // Write at most 4 of the lower bytes of the return buffer
> - //
> - CopyMem (Buffer, (UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset64Lo, MIN (4, Width));
> - if (Width > 4) {
> - //
> - // Write at most 4 of the upper bytes of the return buffer
> - //
> - CopyMem ((UINT8 *)Buffer + 4, (UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset64Hi, Width - 4);
> - }
> - }
> -
> - return EFI_SUCCESS;
> -}
> -
> -/**
> - Read a CPU Save State register on the target processor.
> -
> - This function abstracts the differences that whether the CPU Save State
> register is in the
> - IA32 CPU Save State Map or X64 CPU Save State Map.
> -
> - This function supports reading a CPU Save State register in SMBase
> relocation handler.
> -
> - @param[in] CpuIndex Specifies the zero-based index of the CPU save
> state.
> - @param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up
> table.
> - @param[in] Width The number of bytes to read from the CPU save
> state.
> - @param[out] Buffer Upon return, this holds the CPU register value
> read from the save state.
> -
> - @retval EFI_SUCCESS The register was read from Save State.
> - @retval EFI_NOT_FOUND The register is not defined for the Save State
> of Processor.
> - @retval EFI_INVALID_PARAMETER Buffer is NULL, or Width does not meet
> requirement per Register type.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -ReadSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - OUT VOID *Buffer
> - )
> -{
> - UINT32 SmmRevId;
> - SMRAM_SAVE_STATE_IOMISC IoMisc;
> - EFI_SMM_SAVE_STATE_IO_INFO *IoInfo;
> -
> - //
> - // Check for special EFI_SMM_SAVE_STATE_REGISTER_LMA
> - //
> - if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
> - //
> - // Only byte access is supported for this register
> - //
> - if (Width != 1) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - *(UINT8 *)Buffer = mSmmSaveStateRegisterLma;
> -
> - return EFI_SUCCESS;
> - }
> -
> - //
> - // Check for special EFI_SMM_SAVE_STATE_REGISTER_IO
> - //
> - if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
> - //
> - // Get SMM Revision ID
> - //
> - ReadSaveStateRegisterByIndex (CpuIndex,
> SMM_SAVE_STATE_REGISTER_SMMREVID_INDEX, sizeof (SmmRevId),
> &SmmRevId);
> -
> - //
> - // See if the CPU supports the IOMisc register in the save state
> - //
> - if (SmmRevId < SMRAM_SAVE_STATE_MIN_REV_ID_IOMISC) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // Get the IOMisc register value
> - //
> - ReadSaveStateRegisterByIndex (CpuIndex,
> SMM_SAVE_STATE_REGISTER_IOMISC_INDEX, sizeof (IoMisc.Uint32),
> &IoMisc.Uint32);
> -
> - //
> - // Check for the SMI_FLAG in IOMisc
> - //
> - if (IoMisc.Bits.SmiFlag == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // Only support IN/OUT, but not INS/OUTS/REP INS/REP OUTS.
> - //
> - if ((mSmmCpuIoType[IoMisc.Bits.Type] !=
> EFI_SMM_SAVE_STATE_IO_TYPE_INPUT) &&
> - (mSmmCpuIoType[IoMisc.Bits.Type] !=
> EFI_SMM_SAVE_STATE_IO_TYPE_OUTPUT))
> - {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // Compute index for the I/O Length and I/O Type lookup tables
> - //
> - if ((mSmmCpuIoWidth[IoMisc.Bits.Length].Width == 0) ||
> (mSmmCpuIoType[IoMisc.Bits.Type] == 0)) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // Make sure the incoming buffer is large enough to hold IoInfo before
> accessing
> - //
> - if (Width < sizeof (EFI_SMM_SAVE_STATE_IO_INFO)) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - //
> - // Zero the IoInfo structure that will be returned in Buffer
> - //
> - IoInfo = (EFI_SMM_SAVE_STATE_IO_INFO *)Buffer;
> - ZeroMem (IoInfo, sizeof (EFI_SMM_SAVE_STATE_IO_INFO));
> -
> - //
> - // Use lookup tables to help fill in all the fields of the IoInfo structure
> - //
> - IoInfo->IoPort = (UINT16)IoMisc.Bits.Port;
> - IoInfo->IoWidth = mSmmCpuIoWidth[IoMisc.Bits.Length].IoWidth;
> - IoInfo->IoType = mSmmCpuIoType[IoMisc.Bits.Type];
> - ReadSaveStateRegister (CpuIndex,
> EFI_SMM_SAVE_STATE_REGISTER_RAX,
> mSmmCpuIoWidth[IoMisc.Bits.Length].Width, &IoInfo->IoData);
> - return EFI_SUCCESS;
> - }
> -
> - //
> - // Convert Register to a register lookup table index
> - //
> - return ReadSaveStateRegisterByIndex (CpuIndex, GetRegisterIndex
> (Register), Width, Buffer); -}
> -
> -/**
> - Write value to a CPU Save State register on the target processor.
> -
> - This function abstracts the differences that whether the CPU Save State
> register is in the
> - IA32 CPU Save State Map or X64 CPU Save State Map.
> -
> - This function supports writing a CPU Save State register in SMBase
> relocation handler.
> -
> - @param[in] CpuIndex Specifies the zero-based index of the CPU save
> state.
> - @param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up
> table.
> - @param[in] Width The number of bytes to read from the CPU save
> state.
> - @param[in] Buffer Upon entry, this holds the new CPU register value.
> -
> - @retval EFI_SUCCESS The register was written to Save State.
> - @retval EFI_NOT_FOUND The register is not defined for the Save State
> of Processor.
> - @retval EFI_INVALID_PARAMETER ProcessorIndex or Width is not correct.
> -
> -**/
> -EFI_STATUS
> -EFIAPI
> -WriteSaveStateRegister (
> - IN UINTN CpuIndex,
> - IN EFI_SMM_SAVE_STATE_REGISTER Register,
> - IN UINTN Width,
> - IN CONST VOID *Buffer
> - )
> -{
> - UINTN RegisterIndex;
> - SMRAM_SAVE_STATE_MAP *CpuSaveState;
> -
> - //
> - // Writes to EFI_SMM_SAVE_STATE_REGISTER_LMA are ignored
> - //
> - if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
> - return EFI_SUCCESS;
> - }
> -
> - //
> - // Writes to EFI_SMM_SAVE_STATE_REGISTER_IO are not supported
> - //
> - if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // Convert Register to a register lookup table index
> - //
> - RegisterIndex = GetRegisterIndex (Register);
> - if (RegisterIndex == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - CpuSaveState = gSmst->CpuSaveState[CpuIndex];
> -
> - //
> - // Do not write non-writable SaveState, because it will cause exception.
> - //
> - if (!mSmmCpuWidthOffset[RegisterIndex].Writeable) {
> - return EFI_UNSUPPORTED;
> - }
> -
> - //
> - // Check CPU mode
> - //
> - if (mSmmSaveStateRegisterLma ==
> EFI_SMM_SAVE_STATE_REGISTER_LMA_32BIT) {
> - //
> - // If 32-bit mode width is zero, then the specified register can not be
> accessed
> - //
> - if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // If Width is bigger than the 32-bit mode width, then the specified
> register can not be accessed
> - //
> - if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - //
> - // Write SMM State register
> - //
> - ASSERT (CpuSaveState != NULL);
> - CopyMem ((UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset32, Buffer, Width);
> - } else {
> - //
> - // If 64-bit mode width is zero, then the specified register can not be
> accessed
> - //
> - if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
> - return EFI_NOT_FOUND;
> - }
> -
> - //
> - // If Width is bigger than the 64-bit mode width, then the specified
> register can not be accessed
> - //
> - if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
> - return EFI_INVALID_PARAMETER;
> - }
> -
> - //
> - // Write at most 4 of the lower bytes of SMM State register
> - //
> - CopyMem ((UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset64Lo, Buffer, MIN (4, Width));
> - if (Width > 4) {
> - //
> - // Write at most 4 of the upper bytes of SMM State register
> - //
> - CopyMem ((UINT8 *)CpuSaveState +
> mSmmCpuWidthOffset[RegisterIndex].Offset64Hi, (UINT8 *)Buffer + 4,
> Width - 4);
> - }
> - }
> -
> - return EFI_SUCCESS;
> -}
> -
> /**
> Hook the code executed immediately after an RSM instruction on the
> currently
> executing CPU. The mode of code executed immediately after RSM must
> be
> --
> 2.25.1
>
>
>
>
>
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