136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
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/*++
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Copyright (c) 2000 Intel Corporation
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Module Name:
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Smbios.c
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Abstract:
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Lib fucntions for SMBIOS. Used to get system serial number and GUID
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Revision History
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--*/
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#include "lib.h"
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/*
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* We convert 32 bit values to pointers. In 64 bit mode the compiler will issue a
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* warning stating that the value is too small for the pointer:
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* "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]"
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* we can safely ignore them here.
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*/
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#ifdef __GNUC__
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#pragma GCC diagnostic ignored "-Wint-to-pointer-cast"
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#endif
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EFI_STATUS
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LibGetSmbiosSystemGuidAndSerialNumber (
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IN EFI_GUID *SystemGuid,
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OUT CHAR8 **SystemSerialNumber
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)
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{
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EFI_STATUS Status;
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SMBIOS_STRUCTURE_TABLE *SmbiosTable;
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SMBIOS_STRUCTURE_POINTER Smbios;
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SMBIOS_STRUCTURE_POINTER SmbiosEnd;
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UINT16 Index;
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Status = LibGetSystemConfigurationTable(&SMBIOSTableGuid, (VOID**)&SmbiosTable);
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if (EFI_ERROR(Status)) {
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return EFI_NOT_FOUND;
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}
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Smbios.Hdr = (SMBIOS_HEADER *)SmbiosTable->TableAddress;
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SmbiosEnd.Raw = (UINT8 *)(SmbiosTable->TableAddress + SmbiosTable->TableLength);
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for (Index = 0; Index < SmbiosTable->TableLength ; Index++) {
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if (Smbios.Hdr->Type == 1) {
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if (Smbios.Hdr->Length < 0x19) {
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//
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// Older version did not support Guid and Serial number
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//
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continue;
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}
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//
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// SMBIOS tables are byte packed so we need to do a byte copy to
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// prevend alignment faults on IA-64.
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CopyMem (SystemGuid, &Smbios.Type1->Uuid, sizeof(EFI_GUID));
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*SystemSerialNumber = LibGetSmbiosString(&Smbios, Smbios.Type1->SerialNumber);
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return EFI_SUCCESS;
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}
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//
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// Make Smbios point to the next record
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//
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LibGetSmbiosString (&Smbios, -1);
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if (Smbios.Raw >= SmbiosEnd.Raw) {
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//
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// SMBIOS 2.1 incorrectly stated the length of SmbiosTable as 0x1e.
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// given this we must double check against the lenght of
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/// the structure. My home PC has this bug.ruthard
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//
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return EFI_SUCCESS;
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}
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}
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return EFI_SUCCESS;
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}
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CHAR8*
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LibGetSmbiosString (
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IN SMBIOS_STRUCTURE_POINTER *Smbios,
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IN UINT16 StringNumber
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)
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/*++
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Return SMBIOS string given the string number.
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Arguments:
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Smbios - Pointer to SMBIOS structure
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StringNumber - String number to return. -1 is used to skip all strings and
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point to the next SMBIOS structure.
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Returns:
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Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
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--*/
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{
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UINT16 Index;
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CHAR8 *String;
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//
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// Skip over formatted section
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//
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String = (CHAR8 *)(Smbios->Raw + Smbios->Hdr->Length);
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//
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// Look through unformated section
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//
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for (Index = 1; Index <= StringNumber; Index++) {
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if (StringNumber == Index) {
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return String;
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}
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//
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// Skip string
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//
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for (; *String != 0; String++);
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String++;
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if (*String == 0) {
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//
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// If double NULL then we are done.
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// Retrun pointer to next structure in Smbios.
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// if you pass in a -1 you will always get here
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//
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Smbios->Raw = (UINT8 *)++String;
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return NULL;
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}
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}
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return NULL;
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}
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