include/asm-ppc64/ioctl.h

   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 /* provoke compile error for invalid uses of size argument */
  46 extern unsigned int __invalid_size_argument_for_IOC;
  47 #define _IOC_TYPECHECK(t) \
  48        ((sizeof(t) == sizeof(t[1]) && \
  49          sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
  50          sizeof(t) : __invalid_size_argument_for_IOC)
  51
  52 /* used to create numbers */
  53 #define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
  54 #define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
  55 #define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  56 #define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  57 #define _IOR_BAD(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
  58 #define _IOW_BAD(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  59 #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  60
  61 /* used to decode them.. */
  62 #define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
  63 #define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  64 #define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  65 #define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
  66
  67 /* various drivers, such as the pcmcia stuff, need these... */
  68 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  69 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  70 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  71 #define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
  72 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  73
  74 #endif /* _PPC64_IOCTL_H */