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 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* 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