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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 | |
37 | OUT UINTN *BaseAddress,\r | |
38 | OUT UINTN *NumberOfPages\r | |
39 | )\r | |
40 | {\r | |
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 | |
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 |