1#ifndef _PPC64_IOCTL_H
2#define _PPC64_IOCTL_H
3
4
5/*
6 * This was copied from the alpha as it's a bit cleaner there.
7 *                         -- Cort
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15#define _IOC_NRBITS	8
16#define _IOC_TYPEBITS	8
17#define _IOC_SIZEBITS	13
18#define _IOC_DIRBITS	3
19
20#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
21#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
22#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
23#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)
24
25#define _IOC_NRSHIFT	0
26#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
27#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
28#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
29
30/*
31 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
32 * And this turns out useful to catch old ioctl numbers in header
33 * files for us.
34 */
35#define _IOC_NONE	1U
36#define _IOC_READ	2U
37#define _IOC_WRITE	4U
38
39#define _IOC(dir,type,nr,size) \
40	(((dir)  << _IOC_DIRSHIFT) | \
41	 ((type) << _IOC_TYPESHIFT) | \
42	 ((nr)   << _IOC_NRSHIFT) | \
43	 ((size) << _IOC_SIZESHIFT))
44
45/* used to create numbers */
46#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
47#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
48#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
49#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
50
51/* used to decode them.. */
52#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
53#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
54#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
55#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
56
57/* various drivers, such as the pcmcia stuff, need these... */
58#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
59#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
60#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
61#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
62#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)
63
64#endif /* _PPC64_IOCTL_H */
65