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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 | |
7e25086a LE |
11 | #include <Library/BaseLib.h> // AsciiStrnCmp()\r |
12 | #include <Library/HobLib.h> // GetFirstGuidHob()\r | |
13 | #include <Pi/PiHob.h> // EFI_HOB_GUID_TYPE\r | |
14 | \r | |
a8ab1442 | 15 | #include "XenSmbiosPlatformDxe.h"\r |
3e92a997 | 16 | \r |
ac0a286f MK |
17 | #define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000\r |
18 | #define XEN_SMBIOS_PHYSICAL_END 0x000F0000\r | |
3e92a997 LE |
19 | \r |
20 | /**\r | |
21 | Validates the SMBIOS entry point structure\r | |
22 | \r | |
23 | @param EntryPointStructure SMBIOS entry point structure\r | |
24 | \r | |
25 | @retval TRUE The entry point structure is valid\r | |
26 | @retval FALSE The entry point structure is not valid\r | |
27 | \r | |
28 | **/\r | |
29 | STATIC\r | |
30 | BOOLEAN\r | |
31 | IsEntryPointStructureValid (\r | |
32 | IN SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure\r | |
33 | )\r | |
34 | {\r | |
ac0a286f MK |
35 | UINTN Index;\r |
36 | UINT8 Length;\r | |
37 | UINT8 Checksum;\r | |
38 | UINT8 *BytePtr;\r | |
3e92a997 | 39 | \r |
ac0a286f MK |
40 | BytePtr = (UINT8 *)EntryPointStructure;\r |
41 | Length = EntryPointStructure->EntryPointLength;\r | |
3e92a997 LE |
42 | Checksum = 0;\r |
43 | \r | |
44 | for (Index = 0; Index < Length; Index++) {\r | |
ac0a286f | 45 | Checksum = Checksum + (UINT8)BytePtr[Index];\r |
3e92a997 LE |
46 | }\r |
47 | \r | |
48 | if (Checksum != 0) {\r | |
49 | return FALSE;\r | |
50 | } else {\r | |
51 | return TRUE;\r | |
52 | }\r | |
53 | }\r | |
54 | \r | |
55 | /**\r | |
56 | Locates the Xen SMBIOS data if it exists\r | |
57 | \r | |
58 | @return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data\r | |
59 | \r | |
60 | **/\r | |
61 | SMBIOS_TABLE_ENTRY_POINT *\r | |
62 | GetXenSmbiosTables (\r | |
63 | VOID\r | |
64 | )\r | |
65 | {\r | |
66 | UINT8 *XenSmbiosPtr;\r | |
67 | SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure;\r | |
68 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
69 | \r | |
70 | //\r | |
71 | // See if a XenInfo HOB is available\r | |
72 | //\r | |
73 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
74 | if (GuidHob == NULL) {\r | |
75 | return NULL;\r | |
76 | }\r | |
77 | \r | |
ac0a286f MK |
78 | for (XenSmbiosPtr = (UINT8 *)(UINTN)XEN_SMBIOS_PHYSICAL_ADDRESS;\r |
79 | XenSmbiosPtr < (UINT8 *)(UINTN)XEN_SMBIOS_PHYSICAL_END;\r | |
80 | XenSmbiosPtr += 0x10)\r | |
81 | {\r | |
82 | XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *)XenSmbiosPtr;\r | |
3e92a997 | 83 | \r |
ac0a286f MK |
84 | if (!AsciiStrnCmp ((CHAR8 *)XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&\r |
85 | !AsciiStrnCmp ((CHAR8 *)XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&\r | |
86 | IsEntryPointStructureValid (XenSmbiosEntryPointStructure))\r | |
87 | {\r | |
3e92a997 | 88 | return XenSmbiosEntryPointStructure;\r |
3e92a997 LE |
89 | }\r |
90 | }\r | |
91 | \r | |
92 | return NULL;\r | |
93 | }\r |