1 #ifndef _PPC_IOCTL_H
2 #define _PPC_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 /* used to create numbers */
41 #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
42 #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
43 #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
44 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
45
46 /* used to decode them.. */
47 #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
48 #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
49 #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
50 #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
51
52 /* various drivers, such as the pcmcia stuff, need these... */
53 #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
54 #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
55 #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
56 #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
57 #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
58
59 #endif
60
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