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/*++
Copyright (c) 2000 Intel Corporation
Module Name:
Smbios.c
Abstract:
Lib fucntions for SMBIOS. Used to get system serial number and GUID
Revision History
--*/
#include "lib.h"
/*
* We convert 32 bit values to pointers. In 64 bit mode the compiler will issue a
* warning stating that the value is too small for the pointer:
* "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]"
* we can safely ignore them here.
*/
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wint-to-pointer-cast"
#endif
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 = LibGetSystemConfigurationTable(&SMBIOSTableGuid, (VOID**)&SmbiosTable);
if (EFI_ERROR(Status)) {
return EFI_NOT_FOUND;
}
Smbios.Hdr = (SMBIOS_HEADER *)SmbiosTable->TableAddress;
SmbiosEnd.Raw = (UINT8 *)(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 IA-64.
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, -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
)
/*++
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;
//
// 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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