projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3e92a997 LE |
1 | /** @file\r |
| 2 | Detect Xen hvmloader SMBIOS data for usage by OVMF.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2011, Bei Guan <gbtju85@gmail.com>\r | |
| 5 | Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>\r | |
| 6 | \r | |
| b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 3e92a997 LE |
8 | \r |
| 9 | **/\r | |
| 10 | \r | |
| 11 | #include "SmbiosPlatformDxe.h"\r | |
| 12 | #include <Library/HobLib.h>\r | |
| 13 | #include <Guid/XenInfo.h>\r | |
| 14 | \r | |
| 15 | #define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000\r | |
| 16 | #define XEN_SMBIOS_PHYSICAL_END 0x000F0000\r | |
| 17 | \r | |
| 18 | /**\r | |
| 19 | Validates the SMBIOS entry point structure\r | |
| 20 | \r | |
| 21 | @param EntryPointStructure SMBIOS entry point structure\r | |
| 22 | \r | |
| 23 | @retval TRUE The entry point structure is valid\r | |
| 24 | @retval FALSE The entry point structure is not valid\r | |
| 25 | \r | |
| 26 | **/\r | |
| 27 | STATIC\r | |
| 28 | BOOLEAN\r | |
| 29 | IsEntryPointStructureValid (\r | |
| 30 | IN SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure\r | |
| 31 | )\r | |
| 32 | {\r | |
| 33 | UINTN Index;\r | |
| 34 | UINT8 Length;\r | |
| 35 | UINT8 Checksum;\r | |
| 36 | UINT8 *BytePtr;\r | |
| 37 | \r | |
| 38 | BytePtr = (UINT8*) EntryPointStructure;\r | |
| 39 | Length = EntryPointStructure->EntryPointLength;\r | |
| 40 | Checksum = 0;\r | |
| 41 | \r | |
| 42 | for (Index = 0; Index < Length; Index++) {\r | |
| 43 | Checksum = Checksum + (UINT8) BytePtr[Index];\r | |
| 44 | }\r | |
| 45 | \r | |
| 46 | if (Checksum != 0) {\r | |
| 47 | return FALSE;\r | |
| 48 | } else {\r | |
| 49 | return TRUE;\r | |
| 50 | }\r | |
| 51 | }\r | |
| 52 | \r | |
| 53 | /**\r | |
| 54 | Locates the Xen SMBIOS data if it exists\r | |
| 55 | \r | |
| 56 | @return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data\r | |
| 57 | \r | |
| 58 | **/\r | |
| 59 | SMBIOS_TABLE_ENTRY_POINT *\r | |
| 60 | GetXenSmbiosTables (\r | |
| 61 | VOID\r | |
| 62 | )\r | |
| 63 | {\r | |
| 64 | UINT8 *XenSmbiosPtr;\r | |
| 65 | SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure;\r | |
| 66 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
| 67 | \r | |
| 68 | //\r | |
| 69 | // See if a XenInfo HOB is available\r | |
| 70 | //\r | |
| 71 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
| 72 | if (GuidHob == NULL) {\r | |
| 73 | return NULL;\r | |
| 74 | }\r | |
| 75 | \r | |
| 76 | for (XenSmbiosPtr = (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_ADDRESS;\r | |
| 77 | XenSmbiosPtr < (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_END;\r | |
| 78 | XenSmbiosPtr += 0x10) {\r | |
| 79 | \r | |
| 80 | XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr;\r | |
| 81 | \r | |
| 82 | if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&\r | |
| 83 | !AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&\r | |
| 84 | IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) {\r | |
| 85 | \r | |
| 86 | return XenSmbiosEntryPointStructure;\r | |
| 87 | \r | |
| 88 | }\r | |
| 89 | }\r | |
| 90 | \r | |
| 91 | return NULL;\r | |
| 92 | }\r |