/*	$NetBSD: linux_ioctl.h,v 1.1 1998/09/30 21:36:25 erh Exp $	*/

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Eric Haszlakiewicz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _ALPHA_LINUX_IOCTL_H
#define _ALPHA_LINUX_IOCTL_H

/* Note: Linux looks to have tried to switch to a structured way of defining
 *	ioctls.  Doesn't look like they finished.  Some ioctls use these
 *	defines.  Other are still just a number.  (But they could
 *	probably be encoded as _LINUX_IO('T', #) )
 */
#define	_LINUX_IOC_NRBITS	8
#define	_LINUX_IOC_TYPEBITS	8
#define	_LINUX_IOC_SIZEBITS	13
#define	_LINUX_IOC_DIRBITS	3

#define	_LINUX_IOC_NRMASK	((1 << _LINUX_IOC_NRBITS) - 1)
#define	_LINUX_IOC_TYPEMASK	((1 << _LINUX_IOC_TYPEBITS) - 1)
#define	_LINUX_IOC_SIZEMAEK	((1 << _LINUX_IOC_SIZEBITS) - 1)
#define _LINUX_IOC_DIRMASK	((1 << _LINUX_IOC_DIRBITS) - 1)

#define	_LINUX_IOC_NRSHIFT	0
#define	_LINUX_IOC_TYPESHIFT	(_LINUX_IOC_NRSHIFT + _LINUX_IOC_NRBITS)
#define	_LINUX_IOC_SIZESHIFT	(_LINUX_IOC_TYPESHIFT + _LINUX_IOC_TYPEBITS)
#define	_LINUX_IOC_DIRSHIFT	(_LINUX_IOC_SIZESHIFT + _LINUX_IOC_SIZEBITS)

#define	_LINUX_IOC_NONE		1U
#define	_LINUX_IOC_READ		2U
#define	_LINUX_IOC_WRITE	4U

#define	_LINUX_IOC(dir,type,nr,size)		\
	((unsigned int)				\
	 (((nr)   << _LINUX_IOC_NRSHIFT) |	\
	  ((type) << _LINUX_IOC_TYPESHIFT) |	\
	  ((size) << _LINUX_IOC_SIZESHIFT) |	\
	  ((dir)  << _LINUX_IOC_DIRSHIFT)))

#define _LINUX_IO(type,nr)		\
	_LINUX_IOC(_LINUX_IOC_NONE,(type),(nr),0)
#define	_LINUX_IOR(type,nr,size)	\
	_LINUX_IOC(_LINUX_IOC_READ,(type),(nr),sizeof(size))
#define	_LINUX_IOW(type,nr,size)	\
	_LINUX_IOC(_LINUX_IOC_WRITE,(type),(nr),sizeof(size))
#define	_LINUX_IOWR(type,nr,size)	\
	_LINUX_IOC(_LINUX_IOC_READ|_LINUX_IOC_WRITE,(type),(nr),sizeof(size))

#define _LINUX_IOC_DIR(nr)	\
	(((nr) >> _LINUX_IOC_DIRSHIFT) & _LINUX_IOC_DIRMASK)
#define _LINUX_IOC_TYPE(nr)	\
	(((nr) >> _LINUX_IOC_TYPESHIFT) & _LINUX_IOC_TYPEMASK)
#define _LINUX_IOC_NR(nr)	\
	(((nr) >> _LINUX_IOC_NRSHIFT) & _LINUX_IOC_NRMASK)
#define _LINUX_IOC_SIZE(nr)	\
	(((nr) >> _LINUX_IOC_SIZESHIFT) & _LINUX_IOC_SIZEMASK)

#define LINUX_IOCGROUP(x)	_LINUX_IOC_TYPE(x)
#endif /* !_ALPHA_LINUX_IOCTL_H */