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 | |
| 7 | This program and the accompanying materials\r | |
| 8 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 9 | which accompanies this distribution. The full text of the license may be found at\r | |
| 10 | 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 "SmbiosPlatformDxe.h"\r | |
| 18 | #include <Library/HobLib.h>\r | |
| 19 | #include <Guid/XenInfo.h>\r | |
| 20 | \r | |
| 21 | #define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000\r | |
| 22 | #define XEN_SMBIOS_PHYSICAL_END 0x000F0000\r | |
| 23 | \r | |
| 24 | /**\r | |
| 25 | Validates the SMBIOS entry point structure\r | |
| 26 | \r | |
| 27 | @param EntryPointStructure SMBIOS entry point structure\r | |
| 28 | \r | |
| 29 | @retval TRUE The entry point structure is valid\r | |
| 30 | @retval FALSE The entry point structure is not valid\r | |
| 31 | \r | |
| 32 | **/\r | |
| 33 | STATIC\r | |
| 34 | BOOLEAN\r | |
| 35 | IsEntryPointStructureValid (\r | |
| 36 | IN SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure\r | |
| 37 | )\r | |
| 38 | {\r | |
| 39 | UINTN Index;\r | |
| 40 | UINT8 Length;\r | |
| 41 | UINT8 Checksum;\r | |
| 42 | UINT8 *BytePtr;\r | |
| 43 | \r | |
| 44 | BytePtr = (UINT8*) EntryPointStructure;\r | |
| 45 | Length = EntryPointStructure->EntryPointLength;\r | |
| 46 | Checksum = 0;\r | |
| 47 | \r | |
| 48 | for (Index = 0; Index < Length; Index++) {\r | |
| 49 | Checksum = Checksum + (UINT8) BytePtr[Index];\r | |
| 50 | }\r | |
| 51 | \r | |
| 52 | if (Checksum != 0) {\r | |
| 53 | return FALSE;\r | |
| 54 | } else {\r | |
| 55 | return TRUE;\r | |
| 56 | }\r | |
| 57 | }\r | |
| 58 | \r | |
| 59 | /**\r | |
| 60 | Locates the Xen SMBIOS data if it exists\r | |
| 61 | \r | |
| 62 | @return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data\r | |
| 63 | \r | |
| 64 | **/\r | |
| 65 | SMBIOS_TABLE_ENTRY_POINT *\r | |
| 66 | GetXenSmbiosTables (\r | |
| 67 | VOID\r | |
| 68 | )\r | |
| 69 | {\r | |
| 70 | UINT8 *XenSmbiosPtr;\r | |
| 71 | SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure;\r | |
| 72 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
| 73 | \r | |
| 74 | //\r | |
| 75 | // See if a XenInfo HOB is available\r | |
| 76 | //\r | |
| 77 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
| 78 | if (GuidHob == NULL) {\r | |
| 79 | return NULL;\r | |
| 80 | }\r | |
| 81 | \r | |
| 82 | for (XenSmbiosPtr = (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_ADDRESS;\r | |
| 83 | XenSmbiosPtr < (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_END;\r | |
| 84 | XenSmbiosPtr += 0x10) {\r | |
| 85 | \r | |
| 86 | XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr;\r | |
| 87 | \r | |
| 88 | if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&\r | |
| 89 | !AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&\r | |
| 90 | IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) {\r | |
| 91 | \r | |
| 92 | return XenSmbiosEntryPointStructure;\r | |
| 93 | \r | |
| 94 | }\r | |
| 95 | }\r | |
| 96 | \r | |
| 97 | return NULL;\r | |
| 98 | }\r |