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1 | /** @file\r |
2 | \r | |
3 | AMD Sev Dxe driver. This driver is dispatched early in DXE, due to being list\r | |
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4 | in APRIORI. It clears C-bit from MMIO and NonExistent Memory space when SEV\r |
5 | is enabled.\r | |
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6 | \r |
7 | Copyright (c) 2017, AMD Inc. All rights reserved.<BR>\r | |
8 | \r | |
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9 | This program and the accompanying materials are licensed and made available\r |
10 | under the terms and conditions of the BSD License which accompanies this\r | |
11 | distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
24e4ad75 | 13 | \r |
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14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r |
15 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
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16 | \r |
17 | **/\r | |
18 | \r | |
c6073a0e | 19 | #include <Library/DebugLib.h>\r |
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20 | #include <Library/DxeServicesTableLib.h>\r |
21 | #include <Library/MemEncryptSevLib.h>\r | |
c6073a0e | 22 | #include <Library/MemoryAllocationLib.h>\r |
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23 | \r |
24 | EFI_STATUS\r | |
25 | EFIAPI\r | |
26 | AmdSevDxeEntryPoint (\r | |
27 | IN EFI_HANDLE ImageHandle,\r | |
28 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
29 | )\r | |
30 | {\r | |
31 | EFI_STATUS Status;\r | |
32 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR *AllDescMap;\r | |
33 | UINTN NumEntries;\r | |
34 | UINTN Index;\r | |
35 | \r | |
36 | //\r | |
37 | // Do nothing when SEV is not enabled\r | |
38 | //\r | |
39 | if (!MemEncryptSevIsEnabled ()) {\r | |
40 | return EFI_UNSUPPORTED;\r | |
41 | }\r | |
42 | \r | |
43 | //\r | |
44 | // Iterate through the GCD map and clear the C-bit from MMIO and NonExistent\r | |
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45 | // memory space. The NonExistent memory space will be used for mapping the\r |
46 | // MMIO space added later (eg PciRootBridge). By clearing both known MMIO and\r | |
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47 | // NonExistent memory space can gurantee that current and furture MMIO adds\r |
48 | // will have C-bit cleared.\r | |
49 | //\r | |
50 | Status = gDS->GetMemorySpaceMap (&NumEntries, &AllDescMap);\r | |
51 | if (!EFI_ERROR (Status)) {\r | |
52 | for (Index = 0; Index < NumEntries; Index++) {\r | |
53 | CONST EFI_GCD_MEMORY_SPACE_DESCRIPTOR *Desc;\r | |
54 | \r | |
55 | Desc = &AllDescMap[Index];\r | |
56 | if (Desc->GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo ||\r | |
57 | Desc->GcdMemoryType == EfiGcdMemoryTypeNonExistent) {\r | |
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58 | Status = MemEncryptSevClearPageEncMask (\r |
59 | 0,\r | |
60 | Desc->BaseAddress,\r | |
61 | EFI_SIZE_TO_PAGES (Desc->Length),\r | |
62 | FALSE\r | |
63 | );\r | |
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64 | ASSERT_EFI_ERROR (Status);\r |
65 | }\r | |
66 | }\r | |
67 | \r | |
68 | FreePool (AllDescMap);\r | |
69 | }\r | |
70 | \r | |
71 | return EFI_SUCCESS;\r | |
72 | }\r |