]>
Commit | Line | Data |
---|---|---|
fb511817 | 1 | /** @file |
2 | Detect Xen hvmloader SMBIOS data for usage by OVMF. | |
3 | ||
4 | Copyright (c) 2011, Bei Guan <gbtju85@gmail.com> | |
5 | Copyright (c) 2011, Intel Corporation. All rights reserved.<BR> | |
6 | ||
7 | This program and the accompanying materials | |
8 | are licensed and made available under the terms and conditions of the BSD License | |
9 | which accompanies this distribution. The full text of the license may be found at | |
10 | http://opensource.org/licenses/bsd-license.php | |
11 | ||
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
14 | ||
15 | **/ | |
16 | ||
17 | #include "SmbiosPlatformDxe.h" | |
18 | #include <Library/HobLib.h> | |
19 | #include <Guid/XenInfo.h> | |
20 | ||
21 | #define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000 | |
22 | #define XEN_SMBIOS_PHYSICAL_END 0x000F0000 | |
23 | ||
a136af45 LE |
24 | /** |
25 | Validates the SMBIOS entry point structure | |
26 | ||
27 | @param EntryPointStructure SMBIOS entry point structure | |
28 | ||
29 | @retval TRUE The entry point structure is valid | |
30 | @retval FALSE The entry point structure is not valid | |
31 | ||
32 | **/ | |
33 | STATIC | |
34 | BOOLEAN | |
35 | IsEntryPointStructureValid ( | |
36 | IN SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure | |
37 | ) | |
38 | { | |
39 | UINTN Index; | |
40 | UINT8 Length; | |
41 | UINT8 Checksum; | |
42 | UINT8 *BytePtr; | |
43 | ||
44 | BytePtr = (UINT8*) EntryPointStructure; | |
45 | Length = EntryPointStructure->EntryPointLength; | |
46 | Checksum = 0; | |
47 | ||
48 | for (Index = 0; Index < Length; Index++) { | |
49 | Checksum = Checksum + (UINT8) BytePtr[Index]; | |
50 | } | |
51 | ||
52 | if (Checksum != 0) { | |
53 | return FALSE; | |
54 | } else { | |
55 | return TRUE; | |
56 | } | |
57 | } | |
58 | ||
fb511817 | 59 | /** |
60 | Locates the Xen SMBIOS data if it exists | |
61 | ||
62 | @return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data | |
63 | ||
64 | **/ | |
65 | SMBIOS_TABLE_ENTRY_POINT * | |
66 | GetXenSmbiosTables ( | |
67 | VOID | |
68 | ) | |
69 | { | |
70 | UINT8 *XenSmbiosPtr; | |
71 | SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure; | |
72 | EFI_HOB_GUID_TYPE *GuidHob; | |
73 | ||
74 | // | |
75 | // See if a XenInfo HOB is available | |
76 | // | |
77 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid); | |
78 | if (GuidHob == NULL) { | |
79 | return NULL; | |
80 | } | |
81 | ||
fb11c13e | 82 | for (XenSmbiosPtr = (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_ADDRESS; |
83 | XenSmbiosPtr < (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_END; | |
fb511817 | 84 | XenSmbiosPtr += 0x10) { |
85 | ||
86 | XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr; | |
87 | ||
88 | if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) && | |
89 | !AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) && | |
90 | IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) { | |
91 | ||
92 | return XenSmbiosEntryPointStructure; | |
93 | ||
94 | } | |
95 | } | |
96 | ||
97 | return NULL; | |
98 | } |