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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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