efi_smbios.c

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00001 /*
00002  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017  */
00018 
00019 FILE_LICENCE ( GPL2_OR_LATER );
00020 
00021 #include <errno.h>
00022 #include <gpxe/smbios.h>
00023 #include <gpxe/efi/efi.h>
00024 #include <gpxe/efi/Guid/SmBios.h>
00025 
00026 /** @file
00027  *
00028  * gPXE SMBIOS API for EFI
00029  *
00030  */
00031 
00032 /** SMBIOS configuration table */
00033 static struct smbios_entry *smbios_entry;
00034 EFI_USE_TABLE ( EFI_SMBIOS_TABLE, &smbios_entry, 0 );
00035 
00036 /**
00037  * Find SMBIOS
00038  *
00039  * @v smbios            SMBIOS entry point descriptor structure to fill in
00040  * @ret rc              Return status code
00041  */
00042 static int efi_find_smbios ( struct smbios *smbios ) {
00043 
00044         if ( ! smbios_entry ) {
00045                 DBG ( "No SMBIOS table provided\n" );
00046                 return -ENODEV;
00047         }
00048 
00049         if ( smbios_entry->signature != SMBIOS_SIGNATURE ) {
00050                 DBG ( "Invalid SMBIOS signature\n" );
00051                 return -ENODEV;
00052         }
00053 
00054         smbios->address = phys_to_user ( smbios_entry->smbios_address );
00055         smbios->len = smbios_entry->smbios_len;
00056         smbios->count = smbios_entry->smbios_count;
00057         DBG ( "Found SMBIOS v%d.%d entry point at %p (%x+%zx)\n",
00058               smbios_entry->major, smbios_entry->minor, smbios_entry,
00059               smbios_entry->smbios_address, smbios->len );
00060 
00061         return 0;
00062 }
00063 
00064 PROVIDE_SMBIOS ( efi, find_smbios, efi_find_smbios );