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/** @file
SMRAM Save State Map header file.
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
**/
#ifndef MM_SAVESTATE_H_
#define MM_SAVESTATE_H_
#include <Uefi/UefiBaseType.h>
#include <Protocol/MmCpu.h>
#include <Library/DebugLib.h>
#include <Library/MmSaveStateLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/BaseMemoryLib.h>
// Macro used to simplify the lookup table entries of type CPU_MM_SAVE_STATE_REGISTER_RANGE
#define MM_REGISTER_RANGE(Start, End) { Start, End, End - Start + 1 }
// Structure used to describe a range of registers
typedef struct {
EFI_MM_SAVE_STATE_REGISTER Start;
EFI_MM_SAVE_STATE_REGISTER End;
UINTN Length;
} CPU_MM_SAVE_STATE_REGISTER_RANGE;
// Structure used to build a lookup table to retrieve the widths and offsets
// associated with each supported EFI_MM_SAVE_STATE_REGISTER value
typedef struct {
UINT8 Width32;
UINT8 Width64;
UINT16 Offset32;
UINT16 Offset64Lo;
UINT16 Offset64Hi;
BOOLEAN Writeable;
} CPU_MM_SAVE_STATE_LOOKUP_ENTRY;
/**
Returns LMA value of the Processor.
@retval UINT8 returns LMA bit value.
**/
UINT8
MmSaveStateGetRegisterLma (
VOID
);
/**
Read information from the CPU save state.
@param Register Specifies the CPU register to read form the save state.
@param RegOffset Offset for the next register index.
@retval 0 Register is not valid
@retval >0 Index into mCpuWidthOffset[] associated with Register
**/
UINTN
MmSaveStateGetRegisterIndex (
IN EFI_MM_SAVE_STATE_REGISTER Register,
IN UINTN RegOffset
);
/**
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 mCpuWidthOffset[] 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_PARAMTER This or Buffer is NULL.
**/
EFI_STATUS
MmSaveStateReadRegisterByIndex (
IN UINTN CpuIndex,
IN UINTN RegisterIndex,
IN UINTN Width,
OUT VOID *Buffer
);
#endif
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