ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/Smbios.c

   1 /** @file
   2   Lib fucntions for SMBIOS. Used to get system serial number and GUID
   3
   4   Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "../UefiShellDebug1CommandsLib.h"
  16 #include <Guid/Smbios.h>
  17 #include "LibSmbios.h"
  18
  19 EFI_STATUS
  20 LibGetSmbiosSystemGuidAndSerialNumber (
  21   IN  EFI_GUID    *SystemGuid,
  22   OUT CHAR8       **SystemSerialNumber
  23   )
  24 {
  25   EFI_STATUS                Status;
  26   SMBIOS_STRUCTURE_TABLE    *SmbiosTable;
  27   SMBIOS_STRUCTURE_POINTER  Smbios;
  28   SMBIOS_STRUCTURE_POINTER  SmbiosEnd;
  29   UINT16                    Index;
  30
  31   Status = GetSystemConfigurationTable (&gEfiSmbiosTableGuid, (VOID **) &SmbiosTable);
  32   if (EFI_ERROR (Status)) {
  33     return EFI_NOT_FOUND;
  34   }
  35
  36   Smbios.Hdr    = (SMBIOS_HEADER *) ((UINTN) (SmbiosTable->TableAddress));
  37
  38   SmbiosEnd.Raw = (UINT8 *) ((UINTN) (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       // SMBIOS tables are byte packed so we need to do a byte copy to
  49       //  prevend alignment faults on Itanium-based platform.
  50       //
  51       CopyMem (SystemGuid, &Smbios.Type1->Uuid, sizeof (EFI_GUID));
  52       *SystemSerialNumber = LibGetSmbiosString (&Smbios, Smbios.Type1->SerialNumber);
  53       return EFI_SUCCESS;
  54     }
  55     //
  56     // Make Smbios point to the next record
  57     //
  58     LibGetSmbiosString (&Smbios, (UINT16) (-1));
  59
  60     if (Smbios.Raw >= SmbiosEnd.Raw) {
  61       //
  62       // SMBIOS 2.1 incorrectly stated the length of SmbiosTable as 0x1e.
  63       // given this we must double check against the lenght of
  64       // the structure. My home PC has this bug.ruthard
  65       //
  66       return EFI_SUCCESS;
  67     }
  68   }
  69
  70   return EFI_SUCCESS;
  71 }
  72
  73 CHAR8 *
  74 LibGetSmbiosString (
  75   IN  SMBIOS_STRUCTURE_POINTER    *Smbios,
  76   IN  UINT16                      StringNumber
  77   )
  78 /*++
  79 Routine Description:
  80   Return SMBIOS string given the string number.
  81
  82   Arguments:
  83       Smbios       - Pointer to SMBIOS structure
  84       StringNumber - String number to return. -1 is used to skip all strings and
  85                      point to the next SMBIOS structure.
  86
  87   Returns:
  88       Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
  89 **/
  90 {
  91   UINT16  Index;
  92   CHAR8   *String;
  93
  94   ASSERT (Smbios != NULL);
  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     // Skip string
 110     //
 111     for (; *String != 0; String++);
 112     String++;
 113
 114     if (*String == 0) {
 115       //
 116       // If double NULL then we are done.
 117       //  Retrun pointer to next structure in Smbios.
 118       //  if you pass in a -1 you will always get here
 119       //
 120       Smbios->Raw = (UINT8 *)++String;
 121       return NULL;
 122     }
 123   }
 124
 125   return NULL;
 126 }