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/** @file
Virtual Memory Management Services to set or clear the memory encryption bit
Copyright (c) 2020, AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/CpuLib.h>
#include <Library/MemEncryptSevLib.h>
#include "VirtualMemory.h"
/**
Return the pagetable memory encryption mask.
@return The pagetable memory encryption mask.
**/
UINT64
EFIAPI
InternalGetMemEncryptionAddressMask (
VOID
)
{
UINT64 EncryptionMask;
EncryptionMask = MemEncryptSevGetEncryptionMask ();
EncryptionMask &= PAGING_1G_ADDRESS_MASK_64;
return EncryptionMask;
}
/**
This function clears memory encryption bit for the memory region specified by
PhysicalAddress and Length from the current page table context.
@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
current CR3)
@param[in] PhysicalAddress The physical address that is the start
address of a memory region.
@param[in] Length The length of 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 encyrption attribute
is not supported
**/
RETURN_STATUS
EFIAPI
InternalMemEncryptSevSetMemoryDecrypted (
IN PHYSICAL_ADDRESS Cr3BaseAddress,
IN PHYSICAL_ADDRESS PhysicalAddress,
IN UINTN Length
)
{
//
// This function is not available during SEC.
//
return RETURN_UNSUPPORTED;
}
/**
This function sets memory encryption bit for the memory region specified by
PhysicalAddress and Length from the current page table context.
@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
current CR3)
@param[in] PhysicalAddress The physical address that is the start
address of a memory region.
@param[in] Length The length of memory region
@param[in] Flush Flush the caches before applying the
encryption mask
@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 encyrption attribute
is not supported
**/
RETURN_STATUS
EFIAPI
InternalMemEncryptSevSetMemoryEncrypted (
IN PHYSICAL_ADDRESS Cr3BaseAddress,
IN PHYSICAL_ADDRESS PhysicalAddress,
IN UINTN Length
)
{
//
// This function is not available during SEC.
//
return RETURN_UNSUPPORTED;
}
/**
This function clears memory encryption bit for the MMIO region specified by
PhysicalAddress and Length.
@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
current CR3)
@param[in] PhysicalAddress The physical address that is the start
address of a MMIO region.
@param[in] Length The length of memory region
@retval RETURN_SUCCESS The attributes were cleared for the
memory region.
@retval RETURN_INVALID_PARAMETER Length is zero.
@retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute
is not supported
**/
RETURN_STATUS
EFIAPI
InternalMemEncryptSevClearMmioPageEncMask (
IN PHYSICAL_ADDRESS Cr3BaseAddress,
IN PHYSICAL_ADDRESS PhysicalAddress,
IN UINTN Length
)
{
//
// This function is not available during SEC.
//
return RETURN_UNSUPPORTED;
}
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