SetPermissions.c File Reference

#include <PiMm.h>
#include <PiPei.h>
#include <Guid/MmramMemoryReserve.h>
#include <Guid/MpInformation.h>
#include <Library/Arm/StandaloneMmCoreEntryPoint.h>
#include <Library/ArmMmuLib.h>
#include <Library/ArmSvcLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/SerialPortLib.h>
#include <IndustryStandard/ArmStdSmc.h>

Go to the source code of this file.

Functions
EFI_STATUS EFIAPI	UpdateMmFoundationPeCoffPermissions (IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext, IN EFI_PHYSICAL_ADDRESS ImageBase, IN UINT32 SectionHeaderOffset, IN CONST UINT16 NumberOfSections, IN REGION_PERMISSION_UPDATE_FUNC TextUpdater, IN REGION_PERMISSION_UPDATE_FUNC ReadOnlyUpdater, IN REGION_PERMISSION_UPDATE_FUNC ReadWriteUpdater)
EFI_STATUS EFIAPI	LocateStandaloneMmCorePeCoffData (IN EFI_FIRMWARE_VOLUME_HEADER *BfvAddress, IN OUT VOID **TeData, IN OUT UINTN *TeDataSize)
STATIC EFI_STATUS	GetPeCoffSectionInformation (IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext, OUT EFI_PHYSICAL_ADDRESS *ImageBase, OUT UINT32 *SectionHeaderOffset, OUT UINT16 *NumberOfSections)
EFI_STATUS EFIAPI	GetStandaloneMmCorePeCoffSections (IN VOID *TeData, IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext, OUT EFI_PHYSICAL_ADDRESS *ImageBase, IN OUT UINT32 *SectionHeaderOffset, IN OUT UINT16 *NumberOfSections)

Detailed Description

Locate, get and update PE/COFF permissions during Standalone MM Foundation Entry point on ARM platforms.

Copyright (c) 2017 - 2021, Arm Ltd. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file SetPermissions.c.

Function Documentation

GetPeCoffSectionInformation()

STATIC EFI_STATUS GetPeCoffSectionInformation	(	IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *	ImageContext,
		OUT EFI_PHYSICAL_ADDRESS *	ImageBase,
		OUT UINT32 *	SectionHeaderOffset,
		OUT UINT16 *	NumberOfSections
	)

Returns the PC COFF section information.

Parameters

[in,out]	ImageContext	Pointer to PE/COFF image context
[out]	ImageBase	Base of image in memory
[out]	SectionHeaderOffset	Offset of PE/COFF image section header
[out]	NumberOfSections	Number of Sections

Definition at line 232 of file SetPermissions.c.

GetStandaloneMmCorePeCoffSections()

EFI_STATUS EFIAPI GetStandaloneMmCorePeCoffSections	(	IN VOID *	TeData,
		IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *	ImageContext,
		OUT EFI_PHYSICAL_ADDRESS *	ImageBase,
		IN OUT UINT32 *	SectionHeaderOffset,
		IN OUT UINT16 *	NumberOfSections
	)

Privileged firmware assigns RO & Executable attributes to all memory occupied by the Boot Firmware Volume. This function locates the section information of the Standalone MM Core module to be able to change permissions of the individual sections later in the boot process.

Parameters

[in]	TeData	Pointer to PE/COFF image data
[in,out]	ImageContext	Pointer to PE/COFF image context
[out]	ImageBase	Pointer to ImageBase variable
[in,out]	SectionHeaderOffset	Offset of PE/COFF image section header
[in,out]	NumberOfSections	Number of Sections

Definition at line 347 of file SetPermissions.c.

LocateStandaloneMmCorePeCoffData()

EFI_STATUS EFIAPI LocateStandaloneMmCorePeCoffData	(	IN EFI_FIRMWARE_VOLUME_HEADER *	BfvAddress,
		IN OUT VOID **	TeData,
		IN OUT UINTN *	TeDataSize
	)

Privileged firmware assigns RO & Executable attributes to all memory occupied by the Boot Firmware Volume. This function locates the Standalone MM Core module PE/COFF image in the BFV and returns this information.

Parameters

[in]	BfvAddress	Base Address of Boot Firmware Volume
[in,out]	TeData	Pointer to address for allocating memory for PE/COFF image data
[in,out]	TeDataSize	Pointer to size of PE/COFF image data

Definition at line 179 of file SetPermissions.c.

UpdateMmFoundationPeCoffPermissions()

EFI_STATUS EFIAPI UpdateMmFoundationPeCoffPermissions	(	IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *	ImageContext,
		IN EFI_PHYSICAL_ADDRESS	ImageBase,
		IN UINT32	SectionHeaderOffset,
		IN CONST UINT16	NumberOfSections,
		IN REGION_PERMISSION_UPDATE_FUNC	TextUpdater,
		IN REGION_PERMISSION_UPDATE_FUNC	ReadOnlyUpdater,
		IN REGION_PERMISSION_UPDATE_FUNC	ReadWriteUpdater
	)

Privileged firmware assigns RO & Executable attributes to all memory occupied by the Boot Firmware Volume. This function sets the correct permissions of sections in the Standalone MM Core module to be able to access RO and RW data and make further progress in the boot process.

Parameters

[in]	ImageContext	Pointer to PE/COFF image context
[in]	ImageBase	Base of image in memory
[in]	SectionHeaderOffset	Offset of PE/COFF image section header
[in]	NumberOfSections	Number of Sections
[in]	TextUpdater	Function to change code permissions
[in]	ReadOnlyUpdater	Function to change RO permissions
[in]	ReadWriteUpdater	Function to change RW permissions

Definition at line 44 of file SetPermissions.c.