usr/src/uts/common/sys/ioccom.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #ifndef _SYS_IOCCOM_H
  41 #define _SYS_IOCCOM_H
  42
  43 #pragma ident   "%Z%%M% %I%     %E% SMI"
  44
  45 #ifdef  __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 /*
  50  * Ioctl's have the command encoded in the lower word,
  51  * and the size of any in or out parameters in the upper
  52  * word.  The high 2 bits of the upper word are used
  53  * to encode the in/out status of the parameter; for now
  54  * we restrict parameters to at most 255 bytes.
  55  */
  56 #define IOCPARM_MASK    0xff            /* parameters must be < 256 bytes */
  57 #define IOC_VOID        0x20000000      /* no parameters */
  58 #define IOC_OUT         0x40000000      /* copy out parameters */
  59 #define IOC_IN          0x80000000      /* copy in parameters */
  60 #define IOC_INOUT       (IOC_IN|IOC_OUT)
  61
  62 /*
  63  * The 0x20000000 is so we can distinguish new ioctl's from old.
  64  */
  65 #define _IO(x, y)       (IOC_VOID|(x<<8)|y)
  66 #define _IOR(x, y, t)                                                   \
  67             ((int)((uint32_t)                                           \
  68             (IOC_OUT|(((sizeof (t))&IOCPARM_MASK)<<16)|(x<<8)|y)))
  69
  70 #define _IORN(x, y, t)  ((int)((uint32_t)(IOC_OUT|(((t)&IOCPARM_MASK)<<16)| \
  71             (x<<8)|y)))
  72
  73 #define _IOW(x, y, t)                                                   \
  74             ((int)((uint32_t)(IOC_IN|(((sizeof (t))&IOCPARM_MASK)<<16)| \
  75             (x<<8)|y)))
  76
  77 #define _IOWN(x, y, t)  ((int32_t)(uint32_t)(IOC_IN|(((t)&IOCPARM_MASK)<<16)| \
  78             (x<<8)|y))
  79
  80 #define _IOWR(x, y, t)                                                  \
  81             ((int)((uint32_t)(IOC_INOUT|(((sizeof (t))&IOCPARM_MASK)<<16)| \
  82             (x<<8)|y)))
  83
  84 #define _IOWRN(x, y, t)                                                 \
  85             ((int)((uint32_t)(IOC_INOUT|(((t)&IOCPARM_MASK)<<16)| \
  86             (x<<8)|y)))
  87
  88 #ifdef  __cplusplus
  89 }
  90 #endif
  91
  92 #endif  /* _SYS_IOCCOM_H */