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Linux/include/asm-ppc/ioctl.h

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  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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