efipath.h

#ifndef _EFIPATH_H
#define _EFIPATH_H

/*
 * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

/**
 * @file
 *
 * EFI device paths
 *
 */

#include "efi.h"
#include "efi/Protocol/DevicePath.h"

/**
 * Initialise device path
 *
 * @v name		Variable name
 * @v type		Type
 * @v subtype		Subtype
 */
#define EFI_DEVPATH_INIT( name, type, subtype ) {		\
	.Type = (type),						\
	.SubType = (subtype),					\
	.Length[0] = ( sizeof (name) & 0xff ),			\
	.Length[1] = ( sizeof (name) >> 8 ),			\
	}

/**
 * Initialise device path
 *
 * @v path		Device path
 * @v type		Type
 * @v subtype		Subtype
 * @v len		Length
 */
static inline __attribute__ (( always_inline )) void
efi_devpath_init ( EFI_DEVICE_PATH_PROTOCOL *path, unsigned int type,
		   unsigned int subtype, size_t len ) {

	path->Type = type;
	path->SubType = subtype;
	path->Length[0] = ( len & 0xff );
	path->Length[1] = ( len >> 8 );
}

/**
 * Initialise device path end
 *
 * @v name		Variable name
 */
#define EFI_DEVPATH_END_INIT( name )				\
	EFI_DEVPATH_INIT ( name, END_DEVICE_PATH_TYPE,		\
			   END_ENTIRE_DEVICE_PATH_SUBTYPE )

/**
 * Initialise device path end
 *
 * @v path		Device path
 */
static inline __attribute__ (( always_inline )) void
efi_devpath_end_init ( EFI_DEVICE_PATH_PROTOCOL *path ) {

	efi_devpath_init ( path, END_DEVICE_PATH_TYPE,
			   END_ENTIRE_DEVICE_PATH_SUBTYPE, sizeof ( *path ) );
}

extern EFI_DEVICE_PATH_PROTOCOL *
efi_devpath_end ( EFI_DEVICE_PATH_PROTOCOL *path );

#endif /* _EFIPATH_H */