common/include/sys/ioccom.h

   1 /*      $NetBSD: ioccom.h,v 1.11 2011/10/19 10:53:12 yamt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1982, 1986, 1990, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)ioccom.h    8.3 (Berkeley) 1/9/95
  32  */
  33
  34 #ifndef _SYS_IOCCOM_H_
  35 #define _SYS_IOCCOM_H_
  36
  37 /*
  38  * Ioctl's have the command encoded in the lower word, and the size of
  39  * any in or out parameters in the upper word.  The high 3 bits of the
  40  * upper word are used to encode the in/out status of the parameter.
  41  *
  42  *       31 29 28                     16 15            8 7             0
  43  *      +---------------------------------------------------------------+
  44  *      | I/O | Parameter Length        | Command Group | Command       |
  45  *      +---------------------------------------------------------------+
  46  */
  47 #define IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
  48 #define IOCPARM_SHIFT   16
  49 #define IOCGROUP_SHIFT  8
  50 #define IOCPARM_LEN(x)  (((x) >> IOCPARM_SHIFT) & IOCPARM_MASK)
  51 #define IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << IOCPARM_SHIFT))
  52 #define IOCGROUP(x)     (((x) >> IOCGROUP_SHIFT) & 0xff)
  53
  54 #define IOCPARM_MAX     NBPG    /* max size of ioctl args, mult. of NBPG */
  55                                 /* no parameters */
  56 #define IOC_VOID        (unsigned long)0x20000000
  57                                 /* copy parameters out */
  58 #define IOC_OUT         (unsigned long)0x40000000
  59                                 /* copy parameters in */
  60 #define IOC_IN          (unsigned long)0x80000000
  61                                 /* copy parameters in and out */
  62 #define IOC_INOUT       (IOC_IN|IOC_OUT)
  63                                 /* mask for IN/OUT/VOID */
  64 #define IOC_DIRMASK     (unsigned long)0xe0000000
  65
  66 #define _IOC(inout, group, num, len) \
  67     ((inout) | (((len) & IOCPARM_MASK) << IOCPARM_SHIFT) | \
  68     ((group) << IOCGROUP_SHIFT) | (num))
  69 #define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
  70 #define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
  71 #define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
  72 /* this should be _IORW, but stdio got there first */
  73 #define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
  74
  75 #endif /* !_SYS_IOCCOM_H_ */