mirror of https://github.com/acidanthera/audk.git
82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
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/** @file
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Define Secure Encrypted Virtualization (SEV) base 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 are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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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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#ifndef _MEM_ENCRYPT_SEV_LIB_H_
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#define _MEM_ENCRYPT_SEV_LIB_H_
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#include <Base.h>
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/**
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Returns a boolean to indicate whether SEV is enabled
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@retval TRUE SEV is active
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@retval FALSE SEV is not enabled
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**/
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BOOLEAN
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EFIAPI
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MemEncryptSevIsEnabled (
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VOID
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);
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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] 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 CacheFlush
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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] 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 CacheFlush
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);
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#endif // _MEM_ENCRYPT_SEV_LIB_H_
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