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      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 */
     93