xref: /titanic_50/usr/src/lib/libbc/libc/sys/common/s5sysmacros.h (revision c77a61a72b5ecdc507d6cf104142edd371a16c84)
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 1993 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #define L_BITSMAJOR     14      /* # of SVR4 major device bits */
30 #define L_BITSMINOR     18      /* # of SVR4 minor device bits */
31 #define L_MAXMIN        0x3ffff /* MAX minor for 3b2 software drivers.
32                                 ** For 3b2 hardware devices the minor is
33                                 ** restricted to 256 (0-255)
34                                 */
35 #define O_BITSMINOR     8       /* # of SunOS 4.x minor device bits */
36 #define O_MAXMAJ        0xff    /* SunOS 4.x max major value */
37 #define O_MAXMIN        0xff    /* SunOS 4.x max minor value */
38 
39 /* convert to old dev format */
40 
41 #define cmpdev(x)       (unsigned long)((((x)>>L_BITSMINOR) > O_MAXMAJ || \
42                                 ((x)&L_MAXMIN) > O_MAXMIN) ? NODEV : \
43                                 ((((x)>>L_BITSMINOR)<<O_BITSMINOR)|((x)&O_MAXMIN)))
44