include/asm-sparc/ioctl.h

   1 /* $Id: ioctl.h,v 1.6 1999/12/01 23:58:36 davem Exp $ */
   2 #ifndef _SPARC_IOCTL_H
   3 #define _SPARC_IOCTL_H
   4
   5 /*
   6  * Our DIR and SIZE overlap in order to simulteneously provide
   7  * a non-zero _IOC_NONE (for binary compatibility) and
   8  * 14 bits of size as on i386. Here's the layout:
   9  *
  10  *   0xE0000000   DIR
  11  *   0x80000000     DIR = WRITE
  12  *   0x40000000     DIR = READ
  13  *   0x20000000     DIR = NONE
  14  *   0x3FFF0000   SIZE (overlaps NONE bit)
  15  *   0x0000FF00   TYPE
  16  *   0x000000FF   NR (CMD)
  17  */
  18
  19 #define _IOC_NRBITS      8
  20 #define _IOC_TYPEBITS    8
  21 #define _IOC_SIZEBITS   13      /* Actually 14, see below. */
  22 #define _IOC_DIRBITS     3
  23
  24 #define _IOC_NRMASK      ((1 << _IOC_NRBITS)-1)
  25 #define _IOC_TYPEMASK    ((1 << _IOC_TYPEBITS)-1)
  26 #define _IOC_SIZEMASK    ((1 << _IOC_SIZEBITS)-1)
  27 #define _IOC_XSIZEMASK   ((1 << (_IOC_SIZEBITS+1))-1)
  28 #define _IOC_DIRMASK     ((1 << _IOC_DIRBITS)-1)
  29
  30 #define _IOC_NRSHIFT     0
  31 #define _IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)
  32 #define _IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)
  33 #define _IOC_DIRSHIFT    (_IOC_SIZESHIFT + _IOC_SIZEBITS)
  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 #define _IO(type,nr)        _IOC(_IOC_NONE,(type),(nr),0)
  46 #define _IOR(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
  47 #define _IOW(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
  48 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
  49
  50 /* Used to decode ioctl numbers in drivers despite the leading underscore... */
  51 #define _IOC_DIR(nr)    \
  52  ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)?   \
  53                             (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)):  \
  54                             (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) )
  55 #define _IOC_TYPE(nr)       (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
  56 #define _IOC_NR(nr)         (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
  57 #define _IOC_SIZE(nr)   \
  58  ((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)?    \
  59                          0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))
  60
  61 /* ...and for the PCMCIA and sound. */
  62 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
  63 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
  64 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
  65 #define IOCSIZE_MASK    (_IOC_XSIZEMASK << _IOC_SIZESHIFT)
  66 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
  67
  68 #endif /* !(_SPARC_IOCTL_H) */