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/** @file
Lib fucntions for SMBIOS. Used to get system serial number and GUID
Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "../UefiShellDebug1CommandsLib.h"
#include <Guid/Smbios.h>
#include "LibSmbios.h"
EFI_STATUS
LibGetSmbiosSystemGuidAndSerialNumber (
IN EFI_GUID *SystemGuid,
OUT CHAR8 **SystemSerialNumber
)
{
EFI_STATUS Status;
SMBIOS_STRUCTURE_TABLE *SmbiosTable;
SMBIOS_STRUCTURE_POINTER Smbios;
SMBIOS_STRUCTURE_POINTER SmbiosEnd;
UINT16 Index;
Status = GetSystemConfigurationTable (&gEfiSmbiosTableGuid, (VOID **) &SmbiosTable);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
Smbios.Hdr = (SMBIOS_HEADER *) ((UINTN) (SmbiosTable->TableAddress));
SmbiosEnd.Raw = (UINT8 *) ((UINTN) (SmbiosTable->TableAddress + SmbiosTable->TableLength));
for (Index = 0; Index < SmbiosTable->TableLength; Index++) {
if (Smbios.Hdr->Type == 1) {
if (Smbios.Hdr->Length < 0x19) {
//
// Older version did not support Guid and Serial number
//
continue;
}
//
// SMBIOS tables are byte packed so we need to do a byte copy to
// prevend alignment faults on Itanium-based platform.
//
CopyMem (SystemGuid, &Smbios.Type1->Uuid, sizeof (EFI_GUID));
*SystemSerialNumber = LibGetSmbiosString (&Smbios, Smbios.Type1->SerialNumber);
return EFI_SUCCESS;
}
//
// Make Smbios point to the next record
//
LibGetSmbiosString (&Smbios, (UINT16) (-1));
if (Smbios.Raw >= SmbiosEnd.Raw) {
//
// SMBIOS 2.1 incorrectly stated the length of SmbiosTable as 0x1e.
// given this we must double check against the lenght of
// the structure. My home PC has this bug.ruthard
//
return EFI_SUCCESS;
}
}
return EFI_SUCCESS;
}
CHAR8 *
LibGetSmbiosString (
IN SMBIOS_STRUCTURE_POINTER *Smbios,
IN UINT16 StringNumber
)
/*++
Routine Description:
Return SMBIOS string given the string number.
Arguments:
Smbios - Pointer to SMBIOS structure
StringNumber - String number to return. -1 is used to skip all strings and
point to the next SMBIOS structure.
Returns:
Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
**/
{
UINT16 Index;
CHAR8 *String;
ASSERT (Smbios != NULL);
//
// Skip over formatted section
//
String = (CHAR8 *) (Smbios->Raw + Smbios->Hdr->Length);
//
// Look through unformated section
//
for (Index = 1; Index <= StringNumber; Index++) {
if (StringNumber == Index) {
return String;
}
//
// Skip string
//
for (; *String != 0; String++);
String++;
if (*String == 0) {
//
// If double NULL then we are done.
// Retrun pointer to next structure in Smbios.
// if you pass in a -1 you will always get here
//
Smbios->Raw = (UINT8 *)++String;
return NULL;
}
}
return NULL;
}
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