projects / mirror_edk2.git / blame
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| a1f22614 BS |
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 | |
| 4bd6bf31 LE |
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 | |
| a1f22614 BS |
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 | |
| 5b5028e6 LE |
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 |
| 5b5028e6 LE |
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 |
| 5b5028e6 LE |
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 | |
| a1f22614 BS |
43 | RETURN_STATUS\r |
| 44 | EFIAPI\r | |
| 45 | MemEncryptSevClearPageEncMask (\r | |
| 46 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
| 47 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
| 5b5028e6 | 48 | IN UINTN NumPages,\r |
| a1f22614 BS |
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 | |
| 154dcd6c | 60 | BaseAddress and NumPages from the current page table context.\r |
| a1f22614 | 61 | \r |
| 154dcd6c LE |
62 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r |
| 63 | current CR3)\r | |
| 64 | @param[in] BaseAddress The physical address that is the start\r | |
| 65 | address of a memory region.\r | |
| 66 | @param[in] NumPages The number of pages from start memory\r | |
| 67 | region.\r | |
| 68 | @param[in] Flush Flush the caches before setting the bit\r | |
| 69 | (mostly TRUE except MMIO addresses)\r | |
| a1f22614 | 70 | \r |
| 154dcd6c LE |
71 | @retval RETURN_SUCCESS The attributes were set for the memory\r |
| 72 | region.\r | |
| 73 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
| 74 | @retval RETURN_UNSUPPORTED Setting the memory encryption attribute\r | |
| 75 | is not supported\r | |
| 76 | **/\r | |
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77 | RETURN_STATUS\r |
| 78 | EFIAPI\r | |
| 79 | MemEncryptSevSetPageEncMask (\r | |
| 80 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
| 81 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
| 154dcd6c | 82 | IN UINTN NumPages,\r |
| a1f22614 BS |
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 |