include/asm-ppc/ioctl.h

/* */
   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 #endif
/* */
root/include/asm-ppc/ioctl.h

INCLUDED FROM
