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/** @file
Virtual Memory Management Services to set or clear the memory encryption
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
Code is derived from MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c
**/
#include <Uefi.h>
#include <Uefi/UefiBaseType.h>
#include <Library/BaseLib.h>
#include <Library/MemEncryptTdxLib.h>
/**
Returns boolean to indicate whether to indicate which, if any, memory encryption is enabled
@param[in] Type Bitmask of encryption technologies to check is enabled
@retval TRUE The encryption type(s) are enabled
@retval FALSE The encryption type(s) are not enabled
**/
BOOLEAN
EFIAPI
MemEncryptTdxIsEnabled (
VOID
)
{
return FALSE;
}
/**
This function clears memory encryption bit for the memory region specified by
BaseAddress and NumPages from the current page table context.
@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
current CR3)
@param[in] BaseAddress The physical address that is the start
address of a memory region.
@param[in] NumPages The number of pages from start memory
region.
@retval RETURN_SUCCESS The attributes were cleared for the
memory region.
@retval RETURN_INVALID_PARAMETER Number of pages is zero.
@retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
is not supported
**/
RETURN_STATUS
EFIAPI
MemEncryptTdxSetPageSharedBit (
IN PHYSICAL_ADDRESS Cr3BaseAddress,
IN PHYSICAL_ADDRESS BaseAddress,
IN UINTN NumPages
)
{
return EFI_UNSUPPORTED;
}
/**
This function sets memory encryption bit for the memory region specified by
BaseAddress and NumPages from the current page table context.
@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
current CR3)
@param[in] BaseAddress The physical address that is the start
address of a memory region.
@param[in] NumPages The number of pages from start memory
region.
@retval RETURN_SUCCESS The attributes were set for the memory
region.
@retval RETURN_INVALID_PARAMETER Number of pages is zero.
@retval RETURN_UNSUPPORTED Setting the memory encryption attribute
is not supported
**/
RETURN_STATUS
EFIAPI
MemEncryptTdxClearPageSharedBit (
IN PHYSICAL_ADDRESS Cr3BaseAddress,
IN PHYSICAL_ADDRESS BaseAddress,
IN UINTN NumPages
)
{
return EFI_UNSUPPORTED;
}
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