mirror of https://github.com/acidanthera/audk.git
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/** @file
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Secure Encrypted Virtualization (SEV) library helper function
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Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD
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License which accompanies this distribution. The full text of the license may
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be found at http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Register/Cpuid.h>
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#include <Register/Amd/Cpuid.h>
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#include <Register/Amd/Msr.h>
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#include <Library/MemEncryptSevLib.h>
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/**
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This function clears memory encryption bit for the memory region specified
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by BaseAddress and Number of pages from the current page table context.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current CR3)
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@param[in] BaseAddress The physical address that is the start address
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of a memory region.
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@param[in] NumberOfPages The number of pages from start memory region.
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@param[in] Flush Flush the caches before clearing the bit
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(mostly TRUE except MMIO addresses)
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@retval RETURN_SUCCESS The attributes were cleared for the memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not
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supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptSevClearPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumberOfPages,
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IN BOOLEAN Flush
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)
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{
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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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/**
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This function sets memory encryption bit for the memory region specified by
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BaseAddress and Number of pages from the current page table context.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current CR3)
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@param[in] BaseAddress The physical address that is the start address
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of a memory region.
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@param[in] NumberOfPages The number of pages from start memory region.
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@param[in] Flush Flush the caches before clearing the bit
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(mostly TRUE except MMIO addresses)
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@retval RETURN_SUCCESS The attributes were set for the memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not
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supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptSevSetPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumberOfPages,
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IN BOOLEAN Flush
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)
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{
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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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