BaseMemoryEncryptionNull.c File Reference

#include <Uefi.h>
#include <Uefi/UefiBaseType.h>
#include <Library/BaseLib.h>
#include <Library/MemEncryptTdxLib.h>

Go to the source code of this file.

Functions
BOOLEAN EFIAPI	MemEncryptTdxIsEnabled (VOID)
RETURN_STATUS EFIAPI	MemEncryptTdxSetPageSharedBit (IN PHYSICAL_ADDRESS Cr3BaseAddress, IN PHYSICAL_ADDRESS BaseAddress, IN UINTN NumPages)
RETURN_STATUS EFIAPI	MemEncryptTdxClearPageSharedBit (IN PHYSICAL_ADDRESS Cr3BaseAddress, IN PHYSICAL_ADDRESS BaseAddress, IN UINTN NumPages)

Detailed Description

Virtual Memory Management Services to set or clear the memory encryption

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
Copyright (c) 2017, AMD Incorporated. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Code is derived from MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c

Definition in file BaseMemoryEncryptionNull.c.

Function Documentation

MemEncryptTdxClearPageSharedBit()

RETURN_STATUS EFIAPI MemEncryptTdxClearPageSharedBit	(	IN PHYSICAL_ADDRESS	Cr3BaseAddress,
		IN PHYSICAL_ADDRESS	BaseAddress,
		IN UINTN	NumPages
	)

This function sets memory encryption bit for the memory region specified by BaseAddress and NumPages from the current page table context.

Parameters

[in]	Cr3BaseAddress	Cr3 Base Address (if zero then use current CR3)
[in]	BaseAddress	The physical address that is the start address of a memory region.
[in]	NumPages	The number of pages from start memory region.

Return values

RETURN_SUCCESS	The attributes were set for the memory region.
RETURN_INVALID_PARAMETER	Number of pages is zero.
RETURN_UNSUPPORTED	Setting the memory encryption attribute is not supported

Definition at line 83 of file BaseMemoryEncryptionNull.c.

MemEncryptTdxIsEnabled()

BOOLEAN EFIAPI MemEncryptTdxIsEnabled

(

VOID

)

Returns boolean to indicate whether to indicate which, if any, memory encryption is enabled

Parameters

[in]

Type

Bitmask of encryption technologies to check is enabled

Return values

TRUE	The encryption type(s) are enabled
FALSE	The encryption type(s) are not enabled

Definition at line 29 of file BaseMemoryEncryptionNull.c.

MemEncryptTdxSetPageSharedBit()

RETURN_STATUS EFIAPI MemEncryptTdxSetPageSharedBit	(	IN PHYSICAL_ADDRESS	Cr3BaseAddress,
		IN PHYSICAL_ADDRESS	BaseAddress,
		IN UINTN	NumPages
	)

This function clears memory encryption bit for the memory region specified by BaseAddress and NumPages from the current page table context.

Parameters

[in]	Cr3BaseAddress	Cr3 Base Address (if zero then use current CR3)
[in]	BaseAddress	The physical address that is the start address of a memory region.
[in]	NumPages	The number of pages from start memory region.

Return values

RETURN_SUCCESS	The attributes were cleared for the memory region.
RETURN_INVALID_PARAMETER	Number of pages is zero.
RETURN_UNSUPPORTED	Clearing the memory encryption attribute is not supported

Definition at line 55 of file BaseMemoryEncryptionNull.c.