| Greg Hartman | 76d05dc | 2016-11-23 15:51:27 -0800 | [diff] [blame] | 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 |
| 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* |
| 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 | } |