3 Secure Encrypted Virtualization (SEV) library helper function
5 Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
7 This program and the accompanying materials are licensed and made available
8 under the terms and conditions of the BSD License which accompanies this
9 distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 #include <Library/BaseLib.h>
18 #include <Library/DebugLib.h>
19 #include <Register/Cpuid.h>
20 #include <Register/Amd/Cpuid.h>
21 #include <Register/Amd/Msr.h>
22 #include <Library/MemEncryptSevLib.h>
24 #include "VirtualMemory.h"
28 This function clears memory encryption bit for the memory region specified by
29 BaseAddress and Number of pages from the current page table context.
31 @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
33 @param[in] BaseAddress The physical address that is the start
34 address of a memory region.
35 @param[in] NumberOfPages The number of pages from start memory
37 @param[in] Flush Flush the caches before clearing the bit
38 (mostly TRUE except MMIO addresses)
40 @retval RETURN_SUCCESS The attributes were cleared for the
42 @retval RETURN_INVALID_PARAMETER Number of pages is zero.
43 @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
48 MemEncryptSevClearPageEncMask (
49 IN PHYSICAL_ADDRESS Cr3BaseAddress
,
50 IN PHYSICAL_ADDRESS BaseAddress
,
55 return InternalMemEncryptSevSetMemoryDecrypted (
58 EFI_PAGES_TO_SIZE (NumPages
),
65 This function clears memory encryption bit for the memory region specified by
66 BaseAddress and Number of pages from the current page table context.
68 @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
70 @param[in] BaseAddress The physical address that is the start
71 address of a memory region.
72 @param[in] NumberOfPages The number of pages from start memory
74 @param[in] Flush Flush the caches before clearing the bit
75 (mostly TRUE except MMIO addresses)
77 @retval RETURN_SUCCESS The attributes were cleared for the
79 @retval RETURN_INVALID_PARAMETER Number of pages is zero.
80 @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
85 MemEncryptSevSetPageEncMask (
86 IN PHYSICAL_ADDRESS Cr3BaseAddress
,
87 IN PHYSICAL_ADDRESS BaseAddress
,
92 return InternalMemEncryptSevSetMemoryEncrypted (
95 EFI_PAGES_TO_SIZE (NumPages
),