wimboot/wimboot-2.7.3/src/efipath.c

   1 /*
   2  * Copyright (C) 2014 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 (at your option) 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., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA.
  18  */
  19
  20 /**
  21  * @file
  22  *
  23  * EFI device paths
  24  *
  25  */
  26
  27 #include "wimboot.h"
  28 #include "efi.h"
  29 #include "efipath.h"
  30
  31 /**
  32  * Find end of device path
  33  *
  34  * @v path              Path to device
  35  * @ret path_end        End of device path
  36  */
  37 EFI_DEVICE_PATH_PROTOCOL * efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path ) {
  38
  39         while ( path->Type != END_DEVICE_PATH_TYPE ) {
  40                 path = ( ( ( void * ) path ) +
  41                          /* There's this amazing new-fangled thing known as
  42                           * a UINT16, but who wants to use one of those? */
  43                          ( ( path->Length[1] << 8 ) | path->Length[0] ) );
  44         }
  45         return path;
  46 }