1/*
2 *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
3 *    Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org >
4 *    portions from "linux/ioctl.h for Linux" by H.H. Bergman.
5 *
6 *    This program is free software; you can redistribute it and/or modify
7 *    it under the terms of the GNU General Public License as published by
8 *    the Free Software Foundation; either version 2 of the License, or
9 *    (at your option) any later version.
10 *
11 *    This program is distributed in the hope that it will be useful,
12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *    GNU General Public License for more details.
15 *
16 *    You should have received a copy of the GNU General Public License
17 *    along with this program; if not, write to the Free Software
18 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20
21
22#ifndef _ASM_PARISC_IOCTL_H
23#define _ASM_PARISC_IOCTL_H
24
25/* ioctl command encoding: 32 bits total, command in lower 16 bits,
26 * size of the parameter structure in the lower 14 bits of the
27 * upper 16 bits.
28 * Encoding the size of the parameter structure in the ioctl request
29 * is useful for catching programs compiled with old versions
30 * and to avoid overwriting user space outside the user buffer area.
31 * The highest 2 bits are reserved for indicating the ``access mode''.
32 * NOTE: This limits the max parameter size to 16kB -1 !
33 */
34
35#define _IOC_NRBITS	8
36#define _IOC_TYPEBITS	8
37#define _IOC_SIZEBITS	14
38#define _IOC_DIRBITS	2
39
40#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
41#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
42#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
43#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)
44
45#define _IOC_NRSHIFT	0
46#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
47#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
48#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
49
50/*
51 * Direction bits.
52 */
53#define _IOC_NONE	0U
54#define _IOC_WRITE	2U
55#define _IOC_READ	1U
56
57#define _IOC(dir,type,nr,size) \
58	(((dir)  << _IOC_DIRSHIFT) | \
59	 ((type) << _IOC_TYPESHIFT) | \
60	 ((nr)   << _IOC_NRSHIFT) | \
61	 ((size) << _IOC_SIZESHIFT))
62
63/* provoke compile error for invalid uses of size argument */
64extern unsigned int __invalid_size_argument_for_IOC;
65#define _IOC_TYPECHECK(t) \
66	((sizeof(t) == sizeof(t[1]) && \
67	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
68	  sizeof(t) : __invalid_size_argument_for_IOC)
69
70/* used to create numbers */
71#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
72#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
73#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
74#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
75#define _IOR_BAD(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
76#define _IOW_BAD(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
77#define _IOWR_BAD(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
78
79/* used to decode ioctl numbers.. */
80#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
81#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
82#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
83#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
84
85/* ...and for the drivers/sound files... */
86
87#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
88#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
89#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
90#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
91#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)
92
93#endif /* _ASM_PARISC_IOCTL_H */
94