6 * This was copied from the alpha as it's a bit cleaner there.
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.
16 #define _IOC_TYPEBITS 8
17 #define _IOC_SIZEBITS 13
18 #define _IOC_DIRBITS 3
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)
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)
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
39 #define _IOC(dir,type,nr,size) \
40 (((dir) << _IOC_DIRSHIFT) | \
41 ((type) << _IOC_TYPESHIFT) | \
42 ((nr) << _IOC_NRSHIFT) | \
43 ((size) << _IOC_SIZESHIFT))
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))
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)
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)
64 #endif /* _PPC64_IOCTL_H */