OvmfPkg/MemEncryptSevLib: clean up MemEncryptSevClearPageEncMask() decl
[mirror_edk2.git] / OvmfPkg / Library / BaseMemEncryptSevLib / Ia32 / MemEncryptSevLib.c
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1/** @file\r
2\r
3 Secure Encrypted Virtualization (SEV) library helper function\r
4\r
5 Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r
6\r
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7 This program and the accompanying materials are licensed and made available\r
8 under the terms and conditions of the BSD License which accompanies this\r
9 distribution. The full text of the license may be found at\r
10 http://opensource.org/licenses/bsd-license.php\r
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11\r
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
14\r
15**/\r
16\r
17#include <Library/BaseLib.h>\r
18#include <Library/DebugLib.h>\r
19#include <Register/Cpuid.h>\r
20#include <Register/Amd/Cpuid.h>\r
21#include <Register/Amd/Msr.h>\r
22#include <Library/MemEncryptSevLib.h>\r
23\r
24/**\r
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25 This function clears memory encryption bit for the memory region specified by\r
26 BaseAddress and NumPages from the current page table context.\r
a1f22614 27\r
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28 @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r
29 current CR3)\r
30 @param[in] BaseAddress The physical address that is the start\r
31 address of a memory region.\r
32 @param[in] NumPages The number of pages from start memory\r
33 region.\r
34 @param[in] Flush Flush the caches before clearing the bit\r
35 (mostly TRUE except MMIO addresses)\r
a1f22614 36\r
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37 @retval RETURN_SUCCESS The attributes were cleared for the\r
38 memory region.\r
39 @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r
40 @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute\r
41 is not supported\r
42**/\r
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43RETURN_STATUS\r
44EFIAPI\r
45MemEncryptSevClearPageEncMask (\r
46 IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
47 IN PHYSICAL_ADDRESS BaseAddress,\r
5b5028e6 48 IN UINTN NumPages,\r
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49 IN BOOLEAN Flush\r
50 )\r
51{\r
52 //\r
53 // Memory encryption bit is not accessible in 32-bit mode\r
54 //\r
55 return RETURN_UNSUPPORTED;\r
56}\r
57\r
58/**\r
59 This function sets memory encryption bit for the memory region specified by\r
60 BaseAddress and Number of pages from the current page table context.\r
61\r
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62 @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current\r
63 CR3)\r
64 @param[in] BaseAddress The physical address that is the start\r
65 address of a memory region.\r
66 @param[in] NumberOfPages The number of pages from start memory\r
67 region.\r
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68 @param[in] Flush Flush the caches before clearing the bit\r
69 (mostly TRUE except MMIO addresses)\r
70\r
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71 @retval RETURN_SUCCESS The attributes were set for the memory\r
72 region.\r
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73 @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r
74 @retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not\r
75 supported\r
76 **/\r
77RETURN_STATUS\r
78EFIAPI\r
79MemEncryptSevSetPageEncMask (\r
80 IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
81 IN PHYSICAL_ADDRESS BaseAddress,\r
82 IN UINTN NumberOfPages,\r
83 IN BOOLEAN Flush\r
84 )\r
85{\r
86 //\r
87 // Memory encryption bit is not accessible in 32-bit mode\r
88 //\r
89 return RETURN_UNSUPPORTED;\r
90}\r