projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 7 | This program and the accompanying materials\r | |
| 8 | are licensed and made available under the terms and conditions of the BSD\r | |
| 9 | License which accompanies this distribution. The full text of the license may\r | |
| 10 | be found at 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 | #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 | |
| 25 | This function clears memory encryption bit for the memory region specified\r | |
| 26 | by BaseAddress and Number of pages from the current page table context.\r | |
| 27 | \r | |
| 28 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current CR3)\r | |
| 29 | @param[in] BaseAddress The physical address that is the start address\r | |
| 30 | of a memory region.\r | |
| 31 | @param[in] NumberOfPages The number of pages from start memory region.\r | |
| 32 | @param[in] Flush Flush the caches before clearing the bit\r | |
| 33 | (mostly TRUE except MMIO addresses)\r | |
| 34 | \r | |
| 35 | @retval RETURN_SUCCESS The attributes were cleared for the memory region.\r | |
| 36 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
| 37 | @retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not\r | |
| 38 | supported\r | |
| 39 | **/\r | |
| 40 | RETURN_STATUS\r | |
| 41 | EFIAPI\r | |
| 42 | MemEncryptSevClearPageEncMask (\r | |
| 43 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
| 44 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
| 45 | IN UINTN NumberOfPages,\r | |
| 46 | IN BOOLEAN Flush\r | |
| 47 | )\r | |
| 48 | {\r | |
| 49 | //\r | |
| 50 | // Memory encryption bit is not accessible in 32-bit mode\r | |
| 51 | //\r | |
| 52 | return RETURN_UNSUPPORTED;\r | |
| 53 | }\r | |
| 54 | \r | |
| 55 | /**\r | |
| 56 | This function sets memory encryption bit for the memory region specified by\r | |
| 57 | BaseAddress and Number of pages from the current page table context.\r | |
| 58 | \r | |
| 59 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use current CR3)\r | |
| 60 | @param[in] BaseAddress The physical address that is the start address\r | |
| 61 | of a memory region.\r | |
| 62 | @param[in] NumberOfPages The number of pages from start memory region.\r | |
| 63 | @param[in] Flush Flush the caches before clearing the bit\r | |
| 64 | (mostly TRUE except MMIO addresses)\r | |
| 65 | \r | |
| 66 | @retval RETURN_SUCCESS The attributes were set for the memory region.\r | |
| 67 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
| 68 | @retval RETURN_UNSUPPORTED Clearing memory encryption attribute is not\r | |
| 69 | supported\r | |
| 70 | **/\r | |
| 71 | RETURN_STATUS\r | |
| 72 | EFIAPI\r | |
| 73 | MemEncryptSevSetPageEncMask (\r | |
| 74 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r | |
| 75 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
| 76 | IN UINTN NumberOfPages,\r | |
| 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 |