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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 | |
b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
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8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <Library/BaseLib.h>\r | |
12 | #include <Library/DebugLib.h>\r | |
bd13ecf3 | 13 | #include <Library/MemEncryptSevLib.h>\r |
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14 | #include <Register/Amd/Cpuid.h>\r |
15 | #include <Register/Amd/Msr.h>\r | |
bd13ecf3 | 16 | #include <Register/Cpuid.h>\r |
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17 | \r |
18 | /**\r | |
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19 | This function clears memory encryption bit for the memory region specified by\r |
20 | BaseAddress and NumPages from the current page table context.\r | |
a1f22614 | 21 | \r |
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22 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r |
23 | current CR3)\r | |
24 | @param[in] BaseAddress The physical address that is the start\r | |
25 | address of a memory region.\r | |
26 | @param[in] NumPages The number of pages from start memory\r | |
27 | region.\r | |
28 | @param[in] Flush Flush the caches before clearing the bit\r | |
29 | (mostly TRUE except MMIO addresses)\r | |
a1f22614 | 30 | \r |
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31 | @retval RETURN_SUCCESS The attributes were cleared for the\r |
32 | memory region.\r | |
33 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
34 | @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute\r | |
35 | is not supported\r | |
36 | **/\r | |
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37 | RETURN_STATUS\r |
38 | EFIAPI\r | |
39 | MemEncryptSevClearPageEncMask (\r | |
40 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
41 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
5b5028e6 | 42 | IN UINTN NumPages,\r |
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43 | IN BOOLEAN Flush\r |
44 | )\r | |
45 | {\r | |
46 | //\r | |
47 | // Memory encryption bit is not accessible in 32-bit mode\r | |
48 | //\r | |
49 | return RETURN_UNSUPPORTED;\r | |
50 | }\r | |
51 | \r | |
52 | /**\r | |
53 | This function sets memory encryption bit for the memory region specified by\r | |
154dcd6c | 54 | BaseAddress and NumPages from the current page table context.\r |
a1f22614 | 55 | \r |
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56 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r |
57 | current CR3)\r | |
58 | @param[in] BaseAddress The physical address that is the start\r | |
59 | address of a memory region.\r | |
60 | @param[in] NumPages The number of pages from start memory\r | |
61 | region.\r | |
62 | @param[in] Flush Flush the caches before setting the bit\r | |
63 | (mostly TRUE except MMIO addresses)\r | |
a1f22614 | 64 | \r |
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65 | @retval RETURN_SUCCESS The attributes were set for the memory\r |
66 | region.\r | |
67 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
68 | @retval RETURN_UNSUPPORTED Setting the memory encryption attribute\r | |
69 | is not supported\r | |
70 | **/\r | |
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71 | RETURN_STATUS\r |
72 | EFIAPI\r | |
73 | MemEncryptSevSetPageEncMask (\r | |
74 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
75 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
154dcd6c | 76 | IN UINTN NumPages,\r |
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77 | IN BOOLEAN Flush\r |
78 | )\r | |
79 | {\r | |
80 | //\r | |
81 | // Memory encryption bit is not accessible in 32-bit mode\r | |
82 | //\r | |
83 | return RETURN_UNSUPPORTED;\r | |
84 | }\r |