wimboot/wimboot-2.7.3/src/efipath.h

   1 #ifndef _EFIPATH_H
   2 #define _EFIPATH_H
   3
   4 /*
   5  * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * EFI device paths
  27  *
  28  */
  29
  30 #include "efi.h"
  31 #include "efi/Protocol/DevicePath.h"
  32
  33 /**
  34  * Initialise device path
  35  *
  36  * @v name              Variable name
  37  * @v type              Type
  38  * @v subtype           Subtype
  39  */
  40 #define EFI_DEVPATH_INIT( name, type, subtype ) {               \
  41         .Type = (type),                                         \
  42         .SubType = (subtype),                                   \
  43         .Length[0] = ( sizeof (name) & 0xff ),                  \
  44         .Length[1] = ( sizeof (name) >> 8 ),                    \
  45         }
  46
  47 /**
  48  * Initialise device path
  49  *
  50  * @v path              Device path
  51  * @v type              Type
  52  * @v subtype           Subtype
  53  * @v len               Length
  54  */
  55 static inline __attribute__ (( always_inline )) void
  56 efi_devpath_init ( EFI_DEVICE_PATH_PROTOCOL *path, unsigned int type,
  57                    unsigned int subtype, size_t len ) {
  58
  59         path->Type = type;
  60         path->SubType = subtype;
  61         path->Length[0] = ( len & 0xff );
  62         path->Length[1] = ( len >> 8 );
  63 }
  64
  65 /**
  66  * Initialise device path end
  67  *
  68  * @v name              Variable name
  69  */
  70 #define EFI_DEVPATH_END_INIT( name )                            \
  71         EFI_DEVPATH_INIT ( name, END_DEVICE_PATH_TYPE,          \
  72                            END_ENTIRE_DEVICE_PATH_SUBTYPE )
  73
  74 /**
  75  * Initialise device path end
  76  *
  77  * @v path              Device path
  78  */
  79 static inline __attribute__ (( always_inline )) void
  80 efi_devpath_end_init ( EFI_DEVICE_PATH_PROTOCOL *path ) {
  81
  82         efi_devpath_init ( path, END_DEVICE_PATH_TYPE,
  83                            END_ENTIRE_DEVICE_PATH_SUBTYPE, sizeof ( *path ) );
  84 }
  85
  86 extern EFI_DEVICE_PATH_PROTOCOL *
  87 efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path );
  88
  89 #endif /* _EFIPATH_H */