SecVirtualMemory.c File Reference

#include <Library/CpuLib.h>
#include <Library/MemEncryptSevLib.h>
#include "VirtualMemory.h"

Go to the source code of this file.

Functions
UINT64 EFIAPI	InternalGetMemEncryptionAddressMask (VOID)
RETURN_STATUS EFIAPI	InternalMemEncryptSevSetMemoryDecrypted (IN PHYSICAL_ADDRESS Cr3BaseAddress, IN PHYSICAL_ADDRESS PhysicalAddress, IN UINTN Length)
RETURN_STATUS EFIAPI	InternalMemEncryptSevSetMemoryEncrypted (IN PHYSICAL_ADDRESS Cr3BaseAddress, IN PHYSICAL_ADDRESS PhysicalAddress, IN UINTN Length)
RETURN_STATUS EFIAPI	InternalMemEncryptSevClearMmioPageEncMask (IN PHYSICAL_ADDRESS Cr3BaseAddress, IN PHYSICAL_ADDRESS PhysicalAddress, IN UINTN Length)

Detailed Description

Virtual Memory Management Services to set or clear the memory encryption bit

Copyright (c) 2020, AMD Incorporated. All rights reserved.

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

Definition in file SecVirtualMemory.c.

Function Documentation

InternalGetMemEncryptionAddressMask()

UINT64 EFIAPI InternalGetMemEncryptionAddressMask

(

VOID

)

Return the pagetable memory encryption mask.

Returns

The pagetable memory encryption mask.

Definition at line 24 of file SecVirtualMemory.c.

InternalMemEncryptSevClearMmioPageEncMask()

RETURN_STATUS EFIAPI InternalMemEncryptSevClearMmioPageEncMask	(	IN PHYSICAL_ADDRESS	Cr3BaseAddress,
		IN PHYSICAL_ADDRESS	PhysicalAddress,
		IN UINTN	Length
	)

This function clears memory encryption bit for the MMIO region specified by PhysicalAddress and Length.

Parameters

[in]	Cr3BaseAddress	Cr3 Base Address (if zero then use current CR3)
[in]	PhysicalAddress	The physical address that is the start address of a MMIO region.
[in]	Length	The length of memory region

Return values

RETURN_SUCCESS	The attributes were cleared for the memory region.
RETURN_INVALID_PARAMETER	Length is zero.
RETURN_UNSUPPORTED	Clearing the memory encyrption attribute is not supported

Definition at line 116 of file SecVirtualMemory.c.

InternalMemEncryptSevSetMemoryDecrypted()

RETURN_STATUS EFIAPI InternalMemEncryptSevSetMemoryDecrypted	(	IN PHYSICAL_ADDRESS	Cr3BaseAddress,
		IN PHYSICAL_ADDRESS	PhysicalAddress,
		IN UINTN	Length
	)

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

Parameters

[in]	Cr3BaseAddress	Cr3 Base Address (if zero then use current CR3)
[in]	PhysicalAddress	The physical address that is the start address of a memory region.
[in]	Length	The length of 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 encyrption attribute is not supported

Definition at line 54 of file SecVirtualMemory.c.

InternalMemEncryptSevSetMemoryEncrypted()

RETURN_STATUS EFIAPI InternalMemEncryptSevSetMemoryEncrypted	(	IN PHYSICAL_ADDRESS	Cr3BaseAddress,
		IN PHYSICAL_ADDRESS	PhysicalAddress,
		IN UINTN	Length
	)

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

Parameters

[in]	Cr3BaseAddress	Cr3 Base Address (if zero then use current CR3)
[in]	PhysicalAddress	The physical address that is the start address of a memory region.
[in]	Length	The length of memory region
[in]	Flush	Flush the caches before applying the encryption mask

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 encyrption attribute is not supported

Definition at line 86 of file SecVirtualMemory.c.