/* $NetBSD: smbios.c,v 1.1.1.3 2021/09/30 18:50:09 jmcneill Exp $ */ /*++ 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 *)((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 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; }