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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 |