LXR linux/include/asm-powerpc/ioctl.h

   1#ifndef _ASM_POWERPC_IOCTL_H
   2#define _ASM_POWERPC_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/* provoke compile error for invalid uses of size argument */
  41extern unsigned int __invalid_size_argument_for_IOC;
  42#define _IOC_TYPECHECK(t) \
  43        ((sizeof(t) == sizeof(t[1]) && \
  44          sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
  45          sizeof(t) : __invalid_size_argument_for_IOC)
  46
  47/* used to create numbers */
  48#define _IO(type,nr)            _IOC(_IOC_NONE,(type),(nr),0)
  49#define _IOR(type,nr,size)      _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
  50#define _IOW(type,nr,size)      _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  51#define _IOWR(type,nr,size)     _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
  52#define _IOR_BAD(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
  53#define _IOW_BAD(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  54#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  55
  56/* used to decode them.. */
  57#define _IOC_DIR(nr)            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
  58#define _IOC_TYPE(nr)           (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  59#define _IOC_NR(nr)             (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  60#define _IOC_SIZE(nr)           (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
  61
  62/* various drivers, such as the pcmcia stuff, need these... */
  63#define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  64#define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  65#define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  66#define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
  67#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  68
  69#endif  /* _ASM_POWERPC_IOCTL_H */
  70