/** @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; | |
} |