1 /*++
2
3 Copyright (c) 2000 Intel Corporation
4
5 Module Name:
6
7 Smbios.c
8
9 Abstract:
10
11 Lib fucntions for SMBIOS. Used to get system serial number and GUID
12
13 Revision History
14
15 --*/
16
17 #include "lib.h"
18
19
20 EFI_STATUS
LibGetSmbiosSystemGuidAndSerialNumber(IN EFI_GUID * SystemGuid,OUT CHAR8 ** SystemSerialNumber)21 LibGetSmbiosSystemGuidAndSerialNumber (
22 IN EFI_GUID *SystemGuid,
23 OUT CHAR8 **SystemSerialNumber
24 )
25 {
26 EFI_STATUS Status;
27 SMBIOS_STRUCTURE_TABLE *SmbiosTable;
28 SMBIOS_STRUCTURE_POINTER Smbios;
29 SMBIOS_STRUCTURE_POINTER SmbiosEnd;
30 UINT16 Index;
31
32 Status = LibGetSystemConfigurationTable(&SMBIOSTableGuid, (VOID**)&SmbiosTable);
33 if (EFI_ERROR(Status)) {
34 return EFI_NOT_FOUND;
35 }
36
37 Smbios.Hdr = (SMBIOS_HEADER *)SmbiosTable->TableAddress;
38 SmbiosEnd.Raw = (UINT8 *)(SmbiosTable->TableAddress + SmbiosTable->TableLength);
39 for (Index = 0; Index < SmbiosTable->TableLength ; Index++) {
40 if (Smbios.Hdr->Type == 1) {
41 if (Smbios.Hdr->Length < 0x19) {
42 //
43 // Older version did not support Guid and Serial number
44 //
45 continue;
46 }
47
48 //
49 // SMBIOS tables are byte packed so we need to do a byte copy to
50 // prevend alignment faults on IA-64.
51
52 CopyMem (SystemGuid, &Smbios.Type1->Uuid, sizeof(EFI_GUID));
53 *SystemSerialNumber = LibGetSmbiosString(&Smbios, Smbios.Type1->SerialNumber);
54 return EFI_SUCCESS;
55 }
56
57 //
58 // Make Smbios point to the next record
59 //
60 LibGetSmbiosString (&Smbios, -1);
61
62 if (Smbios.Raw >= SmbiosEnd.Raw) {
63 //
64 // SMBIOS 2.1 incorrectly stated the length of SmbiosTable as 0x1e.
65 // given this we must double check against the lenght of
66 /// the structure. My home PC has this bug.ruthard
67 //
68 return EFI_SUCCESS;
69 }
70 }
71
72 return EFI_SUCCESS;
73 }
74
75 CHAR8*
LibGetSmbiosString(IN SMBIOS_STRUCTURE_POINTER * Smbios,IN UINT16 StringNumber)76 LibGetSmbiosString (
77 IN SMBIOS_STRUCTURE_POINTER *Smbios,
78 IN UINT16 StringNumber
79 )
80 /*++
81
82 Return SMBIOS string given the string number.
83
84 Arguments:
85 Smbios - Pointer to SMBIOS structure
86 StringNumber - String number to return. -1 is used to skip all strings and
87 point to the next SMBIOS structure.
88
89 Returns:
90 Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
91 --*/
92 {
93 UINT16 Index;
94 CHAR8 *String;
95
96 //
97 // Skip over formatted section
98 //
99 String = (CHAR8 *)(Smbios->Raw + Smbios->Hdr->Length);
100
101 //
102 // Look through unformated section
103 //
104 for (Index = 1; Index <= StringNumber; Index++) {
105 if (StringNumber == Index) {
106 return String;
107 }
108
109 //
110 // Skip string
111 //
112 for (; *String != 0; String++);
113 String++;
114
115 if (*String == 0) {
116 //
117 // If double NULL then we are done.
118 // Retrun pointer to next structure in Smbios.
119 // if you pass in a -1 you will always get here
120 //
121 Smbios->Raw = (UINT8 *)++String;
122 return NULL;
123 }
124 }
125 return NULL;
126 }
127