1#ifndef _ASM_POWERPC_IOCTL_H
2#define _ASM_POWERPC_IOCTL_H
3
4
5/*
6 * this was copied from the alpha as it's a bit cleaner there.
7 *                         -- Cort
8 */
9
10#define _IOC_NRBITS	8
11#define _IOC_TYPEBITS	8
12#define _IOC_SIZEBITS	13
13#define _IOC_DIRBITS	3
14
15#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
16#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
17#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
18#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)
19
20#define _IOC_NRSHIFT	0
21#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
22#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
23#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
24
25/*
26 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
27 * And this turns out useful to catch old ioctl numbers in header
28 * files for us.
29 */
30#define _IOC_NONE	1U
31#define _IOC_READ	2U
32#define _IOC_WRITE	4U
33
34#define _IOC(dir,type,nr,size) \
35	(((dir)  << _IOC_DIRSHIFT) | \
36	 ((type) << _IOC_TYPESHIFT) | \
37	 ((nr)   << _IOC_NRSHIFT) | \
38	 ((size) << _IOC_SIZESHIFT))
39
40/* provoke compile error for invalid uses of size argument */
41extern unsigned int __invalid_size_argument_for_IOC;
42#define _IOC_TYPECHECK(t) \
43	((sizeof(t) == sizeof(t[1]) && \
44	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
45	  sizeof(t) : __invalid_size_argument_for_IOC)
46
47/* used to create numbers */
48#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
49#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
50#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
51#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
52#define _IOR_BAD(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
53#define _IOW_BAD(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
54#define _IOWR_BAD(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
55
56/* used to decode them.. */
57#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
58#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
59#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
60#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
61
62/* various drivers, such as the pcmcia stuff, need these... */
63#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
64#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
65#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
66#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
67#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)
68
69#endif	/* _ASM_POWERPC_IOCTL_H */
70