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 | |
| b97dc4b9 | 5 | Copyright (c) 2017 - 2020, AMD Incorporated. All rights reserved.<BR>\r |
| a1f22614 | 6 | \r |
| b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| a1f22614 BS |
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 |
| 61a044c6 | 14 | #include <Library/PcdLib.h>\r |
| 61a044c6 LE |
15 | #include <Register/QemuSmramSaveStateMap.h>\r |
| 16 | #include <Register/SmramSaveStateMap.h>\r | |
| 17 | #include <Uefi/UefiBaseType.h>\r | |
| a1f22614 | 18 | \r |
| 61a044c6 LE |
19 | /**\r |
| 20 | Locate the page range that covers the initial (pre-SMBASE-relocation) SMRAM\r | |
| 21 | Save State Map.\r | |
| 22 | \r | |
| 23 | @param[out] BaseAddress The base address of the lowest-address page that\r | |
| 24 | covers the initial SMRAM Save State Map.\r | |
| 25 | \r | |
| 26 | @param[out] NumberOfPages The number of pages in the page range that covers\r | |
| 27 | the initial SMRAM Save State Map.\r | |
| 28 | \r | |
| 29 | @retval RETURN_SUCCESS BaseAddress and NumberOfPages have been set on\r | |
| 30 | output.\r | |
| 31 | \r | |
| 32 | @retval RETURN_UNSUPPORTED SMM is unavailable.\r | |
| 33 | **/\r | |
| 34 | RETURN_STATUS\r | |
| 35 | EFIAPI\r | |
| 36 | MemEncryptSevLocateInitialSmramSaveStateMapPages (\r | |
| ac0a286f MK |
37 | OUT UINTN *BaseAddress,\r |
| 38 | OUT UINTN *NumberOfPages\r | |
| 61a044c6 LE |
39 | )\r |
| 40 | {\r | |
| ac0a286f MK |
41 | UINTN MapStart;\r |
| 42 | UINTN MapEnd;\r | |
| 43 | UINTN MapPagesStart; // MapStart rounded down to page boundary\r | |
| 44 | UINTN MapPagesEnd; // MapEnd rounded up to page boundary\r | |
| 45 | UINTN MapPagesSize; // difference between MapPagesStart and MapPagesEnd\r | |
| 61a044c6 LE |
46 | \r |
| 47 | if (!FeaturePcdGet (PcdSmmSmramRequire)) {\r | |
| 48 | return RETURN_UNSUPPORTED;\r | |
| 49 | }\r | |
| 50 | \r | |
| 51 | MapStart = SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET;\r | |
| 52 | MapEnd = MapStart + sizeof (QEMU_SMRAM_SAVE_STATE_MAP);\r | |
| 53 | MapPagesStart = MapStart & ~(UINTN)EFI_PAGE_MASK;\r | |
| 54 | MapPagesEnd = ALIGN_VALUE (MapEnd, EFI_PAGE_SIZE);\r | |
| 55 | MapPagesSize = MapPagesEnd - MapPagesStart;\r | |
| 56 | \r | |
| 57 | ASSERT ((MapPagesSize & EFI_PAGE_MASK) == 0);\r | |
| 58 | \r | |
| 59 | *BaseAddress = MapPagesStart;\r | |
| 60 | *NumberOfPages = MapPagesSize >> EFI_PAGE_SHIFT;\r | |
| 61 | \r | |
| 62 | return RETURN_SUCCESS;\r | |
| 63 | }\r |