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1 | /** @file\r |
2 | \r | |
3 | Define Secure Encrypted Virtualization (SEV) base library helper function\r | |
4 | \r | |
5 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r | |
6 | \r | |
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 | |
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 | #ifndef _MEM_ENCRYPT_SEV_LIB_H_\r | |
18 | #define _MEM_ENCRYPT_SEV_LIB_H_\r | |
19 | \r | |
20 | #include <Base.h>\r | |
21 | \r | |
22 | /**\r | |
23 | Returns a boolean to indicate whether SEV is enabled\r | |
24 | \r | |
25 | @retval TRUE SEV is active\r | |
26 | @retval FALSE SEV is not enabled\r | |
27 | **/\r | |
28 | BOOLEAN\r | |
29 | EFIAPI\r | |
30 | MemEncryptSevIsEnabled (\r | |
31 | VOID\r | |
32 | );\r | |
33 | \r | |
34 | /**\r | |
35 | This function clears memory encryption bit for the memory region specified\r | |
36 | by BaseAddress and Number of pages from the current page table context.\r | |
37 | \r | |
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38 | @param[in] BaseAddress The physical address that is the start\r |
39 | address of a memory region.\r | |
40 | @param[in] NumberOfPages The number of pages from start memory\r | |
41 | region.\r | |
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42 | @param[in] Flush Flush the caches before clearing the bit\r |
43 | (mostly TRUE except MMIO addresses)\r | |
44 | \r | |
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45 | @retval RETURN_SUCCESS The attributes were cleared for the memory\r |
46 | region.\r | |
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47 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r |
48 | @retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not\r | |
49 | supported\r | |
50 | **/\r | |
51 | RETURN_STATUS\r | |
52 | EFIAPI\r | |
53 | MemEncryptSevClearPageEncMask (\r | |
54 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
55 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
56 | IN UINTN NumberOfPages,\r | |
57 | IN BOOLEAN CacheFlush\r | |
58 | );\r | |
59 | \r | |
60 | /**\r | |
61 | This function sets memory encryption bit for the memory region specified by\r | |
62 | BaseAddress and Number of pages from the current page table context.\r | |
63 | \r | |
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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 | |
77 | RETURN_STATUS\r | |
78 | EFIAPI\r | |
79 | MemEncryptSevSetPageEncMask (\r | |
80 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
81 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
82 | IN UINTN NumberOfPages,\r | |
83 | IN BOOLEAN CacheFlush\r | |
84 | );\r | |
85 | #endif // _MEM_ENCRYPT_SEV_LIB_H_\r |