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 * We convert 32 bit values to pointers. In 64 bit mode the compiler will issue a
21 * warning stating that the value is too small for the pointer:
22 * "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]"
23 * we can safely ignore them here.
24 */
25 #ifdef __GNUC__
26 #pragma GCC diagnostic ignored "-Wint-to-pointer-cast"
27 #endif
28
29 EFI_STATUS
LibGetSmbiosSystemGuidAndSerialNumber(IN EFI_GUID * SystemGuid,OUT CHAR8 ** SystemSerialNumber)30 LibGetSmbiosSystemGuidAndSerialNumber (
31 IN EFI_GUID *SystemGuid,
32 OUT CHAR8 **SystemSerialNumber
33 )
34 {
35 EFI_STATUS Status;
36 SMBIOS_STRUCTURE_TABLE *SmbiosTable;
37 SMBIOS_STRUCTURE_POINTER Smbios;
38 SMBIOS_STRUCTURE_POINTER SmbiosEnd;
39 UINT16 Index;
40
41 Status = LibGetSystemConfigurationTable(&SMBIOSTableGuid, (VOID**)&SmbiosTable);
42 if (EFI_ERROR(Status)) {
43 return EFI_NOT_FOUND;
44 }
45
46 Smbios.Hdr = (SMBIOS_HEADER *)SmbiosTable->TableAddress;
47 SmbiosEnd.Raw = (UINT8 *)((UINTN)SmbiosTable->TableAddress + SmbiosTable->TableLength);
48 for (Index = 0; Index < SmbiosTable->TableLength ; Index++) {
49 if (Smbios.Hdr->Type == 1) {
50 if (Smbios.Hdr->Length < 0x19) {
51 //
52 // Older version did not support Guid and Serial number
53 //
54 continue;
55 }
56
57 //
58 // SMBIOS tables are byte packed so we need to do a byte copy to
59 // prevend alignment faults on IA-64.
60
61 CopyMem (SystemGuid, &Smbios.Type1->Uuid, sizeof(EFI_GUID));
62 *SystemSerialNumber = LibGetSmbiosString(&Smbios, Smbios.Type1->SerialNumber);
63 return EFI_SUCCESS;
64 }
65
66 //
67 // Make Smbios point to the next record
68 //
69 LibGetSmbiosString (&Smbios, -1);
70
71 if (Smbios.Raw >= SmbiosEnd.Raw) {
72 //
73 // SMBIOS 2.1 incorrectly stated the length of SmbiosTable as 0x1e.
74 // given this we must double check against the lenght of
75 /// the structure. My home PC has this bug.ruthard
76 //
77 return EFI_SUCCESS;
78 }
79 }
80
81 return EFI_SUCCESS;
82 }
83
84 CHAR8*
LibGetSmbiosString(IN SMBIOS_STRUCTURE_POINTER * Smbios,IN UINT16 StringNumber)85 LibGetSmbiosString (
86 IN SMBIOS_STRUCTURE_POINTER *Smbios,
87 IN UINT16 StringNumber
88 )
89 /*++
90
91 Return SMBIOS string given the string number.
92
93 Arguments:
94 Smbios - Pointer to SMBIOS structure
95 StringNumber - String number to return. -1 is used to skip all strings and
96 point to the next SMBIOS structure.
97
98 Returns:
99 Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
100 --*/
101 {
102 UINT16 Index;
103 CHAR8 *String;
104
105 //
106 // Skip over formatted section
107 //
108 String = (CHAR8 *)(Smbios->Raw + Smbios->Hdr->Length);
109
110 //
111 // Look through unformated section
112 //
113 for (Index = 1; Index <= StringNumber; Index++) {
114 if (StringNumber == Index) {
115 return String;
116 }
117
118 //
119 // Skip string
120 //
121 for (; *String != 0; String++);
122 String++;
123
124 if (*String == 0) {
125 //
126 // If double NULL then we are done.
127 // Retrun pointer to next structure in Smbios.
128 // if you pass in a -1 you will always get here
129 //
130 Smbios->Raw = (UINT8 *)++String;
131 return NULL;
132 }
133 }
134 return NULL;
135 }
136