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Linux/include/asm-ppc64/ioctl.h

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  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 

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