#include "InternalSmmRelocationLib.h"
#include <Register/Amd/SmramSaveStateMap.h>

Functions
UINT8	GetMmSaveStateRegisterLma (VOID)

VOID EFIAPI	ConfigureSmBase (IN UINT64 SmBase)

UINT64 EFIAPI	HookReturnFromSmm (IN OUT SMRAM_SAVE_STATE_MAP *CpuState, IN UINT64 NewInstructionPointer32, IN UINT64 NewInstructionPointer)

Detailed Description

Config SMRAM Save State for SmmBases Relocation.

Copyright (C) 2023 - 2024 Advanced Micro Devices, Inc. All rights reserved.
Copyright (c) 2024, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file AmdSmramSaveStateConfig.c.

Function Documentation

◆ ConfigureSmBase()

VOID EFIAPI ConfigureSmBase ( IN UINT64 SmBase )

This function configures the SmBase on the currently executing CPU.

Parameters

[in] SmBase The SmBase on the currently executing CPU.

Definition at line 46 of file AmdSmramSaveStateConfig.c.

◆ GetMmSaveStateRegisterLma()

UINT8 GetMmSaveStateRegisterLma ( VOID )

Get the mode of the CPU at the time an SMI occurs

Return values

EFI_MM_SAVE_STATE_REGISTER_LMA_32BIT	32 bit.
EFI_MM_SAVE_STATE_REGISTER_LMA_64BIT	64 bit.

Definition at line 20 of file AmdSmramSaveStateConfig.c.

◆ HookReturnFromSmm()

UINT64 EFIAPI HookReturnFromSmm	(	IN OUT SMRAM_SAVE_STATE_MAP *	CpuState,
		IN UINT64	NewInstructionPointer32,
		IN UINT64	NewInstructionPointer
	)

This function updates the SMRAM save state on the currently executing CPU to resume execution at a specific address after an RSM instruction. This function must evaluate the SMRAM save state to determine the execution mode the RSM instruction resumes and update the resume execution address with either NewInstructionPointer32 or NewInstructionPoint. The auto HALT restart flag in the SMRAM save state must always be cleared. This function returns the value of the instruction pointer from the SMRAM save state that was replaced. If this function returns 0, then the SMRAM save state was not modified.

This function is called during the very first SMI on each CPU after SmmCpuFeaturesInitializeProcessor() to set a flag in normal execution mode to signal that the SMBASE of each CPU has been updated before the default SMBASE address is used for the first SMI to the next CPU.