LXR linux/arch/sparc/include/asm/ioctl.h

   1#ifndef _SPARC_IOCTL_H
   2#define _SPARC_IOCTL_H
   3
   4/*
   5 * Our DIR and SIZE overlap in order to simulteneously provide
   6 * a non-zero _IOC_NONE (for binary compatibility) and
   7 * 14 bits of size as on i386. Here's the layout:
   8 *
   9 *   0xE0000000   DIR
  10 *   0x80000000     DIR = WRITE
  11 *   0x40000000     DIR = READ
  12 *   0x20000000     DIR = NONE
  13 *   0x3FFF0000   SIZE (overlaps NONE bit)
  14 *   0x0000FF00   TYPE
  15 *   0x000000FF   NR (CMD)
  16 */
  17
  18#define _IOC_NRBITS      8
  19#define _IOC_TYPEBITS    8
  20#define _IOC_SIZEBITS   13      /* Actually 14, see below. */
  21#define _IOC_DIRBITS     3
  22
  23#define _IOC_NRMASK      ((1 << _IOC_NRBITS)-1)
  24#define _IOC_TYPEMASK    ((1 << _IOC_TYPEBITS)-1)
  25#define _IOC_SIZEMASK    ((1 << _IOC_SIZEBITS)-1)
  26#define _IOC_XSIZEMASK   ((1 << (_IOC_SIZEBITS+1))-1)
  27#define _IOC_DIRMASK     ((1 << _IOC_DIRBITS)-1)
  28
  29#define _IOC_NRSHIFT     0
  30#define _IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)
  31#define _IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)
  32#define _IOC_DIRSHIFT    (_IOC_SIZESHIFT + _IOC_SIZEBITS)
  33
  34#define _IOC_NONE        1U
  35#define _IOC_READ        2U
  36#define _IOC_WRITE       4U
  37
  38#define _IOC(dir,type,nr,size) \
  39        (((dir)  << _IOC_DIRSHIFT) | \
  40         ((type) << _IOC_TYPESHIFT) | \
  41         ((nr)   << _IOC_NRSHIFT) | \
  42         ((size) << _IOC_SIZESHIFT))
  43
  44#define _IO(type,nr)        _IOC(_IOC_NONE,(type),(nr),0)
  45#define _IOR(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
  46#define _IOW(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  47#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  48
  49/* Used to decode ioctl numbers in drivers despite the leading underscore... */
  50#define _IOC_DIR(nr)    \
  51 ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)?   \
  52                            (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)):  \
  53                            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) )
  54#define _IOC_TYPE(nr)       (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  55#define _IOC_NR(nr)         (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  56#define _IOC_SIZE(nr)   \
  57 ((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)?    \
  58                         0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))
  59
  60/* ...and for the PCMCIA and sound. */
  61#define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  62#define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  63#define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  64#define IOCSIZE_MASK    (_IOC_XSIZEMASK << _IOC_SIZESHIFT)
  65#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  66
  67#endif /* !(_SPARC_IOCTL_H) */
  68