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
8 are licensed and made available under the terms and conditions of the BSD
9 License which accompanies this distribution. The full text of the license may
10 be found at 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 current CR3)
32 @param[in] BaseAddress The physical address that is the start address
34 @param[in] NumberOfPages The number of pages from start memory region.
35 @param[in] Flush Flush the caches before clearing the bit
36 (mostly TRUE except MMIO addresses)
38 @retval RETURN_SUCCESS The attributes were cleared for the memory
40 @retval RETURN_INVALID_PARAMETER Number of pages is zero.
41 @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute is
46 MemEncryptSevClearPageEncMask (
47 IN PHYSICAL_ADDRESS Cr3BaseAddress
,
48 IN PHYSICAL_ADDRESS BaseAddress
,
53 return InternalMemEncryptSevSetMemoryDecrypted (Cr3BaseAddress
, BaseAddress
, EFI_PAGES_TO_SIZE(NumPages
), Flush
);
58 This function clears memory encryption bit for the memory region specified by
59 BaseAddress and Number of pages from the current page table context.
61 @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current CR3)
62 @param[in] BaseAddress The physical address that is the start address
64 @param[in] NumberOfPages The number of pages from start memory region.
65 @param[in] Flush Flush the caches before clearing the bit
66 (mostly TRUE except MMIO addresses)
68 @retval RETURN_SUCCESS The attributes were cleared for the memory
70 @retval RETURN_INVALID_PARAMETER Number of pages is zero.
71 @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute is
76 MemEncryptSevSetPageEncMask (
77 IN PHYSICAL_ADDRESS Cr3BaseAddress
,
78 IN PHYSICAL_ADDRESS BaseAddress
,
83 return InternalMemEncryptSevSetMemoryEncrypted (Cr3BaseAddress
, BaseAddress
, EFI_PAGES_TO_SIZE(NumPages
), Flush
);