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/** @file
Library that provides service to read/write CPU specific smram save state registers.
Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
@note
SaveState(Read/Write) of EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID/EFI_MM_SAVE_STATE_REGISTER_PROCESSOR_ID
is handled by PiSmmCpuDxeSmm driver.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef MM_SAVE_STATE_LIB_H_
#define MM_SAVE_STATE_LIB_H_
#include <Protocol/MmCpu.h>
#include <Uefi/UefiBaseType.h>
/**
Read a save state register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for reading the
MM Save State register.
@param[in] CpuIndex The index of the CPU to read the Save State register.
The value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The MM 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.
@retval EFI_NOT_FOUND If desired Register not found.
**/
EFI_STATUS
EFIAPI
MmSaveStateReadRegister (
IN UINTN CpuIndex,
IN EFI_MM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
OUT VOID *Buffer
);
/**
Writes a save state register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for writing the
MM save state register.
@param[in] CpuIndex The index of the CPU to write the MM Save State. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The MM 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.
@retval EFI_NOT_FOUND If desired Register not found.
**/
EFI_STATUS
EFIAPI
MmSaveStateWriteRegister (
IN UINTN CpuIndex,
IN EFI_MM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
IN CONST VOID *Buffer
);
#endif
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