mirror of https://github.com/acidanthera/audk.git
85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/** @file
|
|
|
|
Secure Encrypted Virtualization (SEV) library helper function
|
|
|
|
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/MemEncryptSevLib.h>
|
|
#include <Register/Amd/Cpuid.h>
|
|
#include <Register/Amd/Msr.h>
|
|
#include <Register/Cpuid.h>
|
|
|
|
/**
|
|
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.
|
|
@param[in] Flush Flush the caches before clearing the bit
|
|
(mostly TRUE except MMIO addresses)
|
|
|
|
@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
|
|
MemEncryptSevClearPageEncMask (
|
|
IN PHYSICAL_ADDRESS Cr3BaseAddress,
|
|
IN PHYSICAL_ADDRESS BaseAddress,
|
|
IN UINTN NumPages,
|
|
IN BOOLEAN Flush
|
|
)
|
|
{
|
|
//
|
|
// Memory encryption bit is not accessible in 32-bit mode
|
|
//
|
|
return RETURN_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.
|
|
@param[in] Flush Flush the caches before setting the bit
|
|
(mostly TRUE except MMIO addresses)
|
|
|
|
@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
|
|
MemEncryptSevSetPageEncMask (
|
|
IN PHYSICAL_ADDRESS Cr3BaseAddress,
|
|
IN PHYSICAL_ADDRESS BaseAddress,
|
|
IN UINTN NumPages,
|
|
IN BOOLEAN Flush
|
|
)
|
|
{
|
|
//
|
|
// Memory encryption bit is not accessible in 32-bit mode
|
|
//
|
|
return RETURN_UNSUPPORTED;
|
|
}
|