src/interface/efi/efi_smbios.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <errno.h>
  22 #include <gpxe/smbios.h>
  23 #include <gpxe/efi/efi.h>
  24 #include <gpxe/efi/Guid/SmBios.h>
  25
  26 /** @file
  27  *
  28  * gPXE SMBIOS API for EFI
  29  *
  30  */
  31
  32 /** SMBIOS configuration table */
  33 static struct smbios_entry *smbios_entry;
  34 EFI_USE_TABLE ( SMBIOS_TABLE, &smbios_entry, 0 );
  35
  36 /**
  37  * Find SMBIOS
  38  *
  39  * @v smbios            SMBIOS entry point descriptor structure to fill in
  40  * @ret rc              Return status code
  41  */
  42 static int efi_find_smbios ( struct smbios *smbios ) {
  43
  44         if ( ! smbios_entry ) {
  45                 DBG ( "No SMBIOS table provided\n" );
  46                 return -ENODEV;
  47         }
  48
  49         if ( smbios_entry->signature != SMBIOS_SIGNATURE ) {
  50                 DBG ( "Invalid SMBIOS signature\n" );
  51                 return -ENODEV;
  52         }
  53
  54         smbios->address = phys_to_user ( smbios_entry->smbios_address );
  55         smbios->len = smbios_entry->smbios_len;
  56         smbios->count = smbios_entry->smbios_count;
  57         DBG ( "Found SMBIOS v%d.%d entry point at %p (%x+%zx)\n",
  58               smbios_entry->major, smbios_entry->minor, smbios_entry,
  59               smbios_entry->smbios_address, smbios->len );
  60
  61         return 0;
  62 }
  63
  64 PROVIDE_SMBIOS ( efi, find_smbios, efi_find_smbios );