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Annotation of sys/kern/subr_xxx.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: subr_xxx.c,v 1.9 2005/12/09 09:09:52 jsg Exp $        */
        !             2: /*     $NetBSD: subr_xxx.c,v 1.10 1996/02/04 02:16:51 christos Exp $   */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1982, 1986, 1991, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  *
        !            32:  *     @(#)subr_xxx.c  8.1 (Berkeley) 6/10/93
        !            33:  */
        !            34:
        !            35: /*
        !            36:  * Miscellaneous trivial functions, including many
        !            37:  * that are often inline-expanded or done in assembler.
        !            38:  */
        !            39: #include <sys/param.h>
        !            40: #include <sys/systm.h>
        !            41: #include <sys/device.h>
        !            42: #include <sys/conf.h>
        !            43:
        !            44: #include <machine/cpu.h>
        !            45:
        !            46: /*
        !            47:  * Unsupported device function (e.g. writing to read-only device).
        !            48:  */
        !            49: int
        !            50: enodev(void)
        !            51: {
        !            52:
        !            53:        return (ENODEV);
        !            54: }
        !            55:
        !            56: /*
        !            57:  * Unconfigured device function; driver not configured.
        !            58:  */
        !            59: int
        !            60: enxio(void)
        !            61: {
        !            62:
        !            63:        return (ENXIO);
        !            64: }
        !            65:
        !            66: /*
        !            67:  * Unsupported ioctl function.
        !            68:  */
        !            69: int
        !            70: enoioctl(void)
        !            71: {
        !            72:
        !            73:        return (ENOTTY);
        !            74: }
        !            75:
        !            76: /*
        !            77:  * Unsupported system function.
        !            78:  * This is used for an otherwise-reasonable operation
        !            79:  * that is not supported by the current system binary.
        !            80:  */
        !            81: int
        !            82: enosys(void)
        !            83: {
        !            84:
        !            85:        return (ENOSYS);
        !            86: }
        !            87:
        !            88: /*
        !            89:  * Return error for operation not supported
        !            90:  * on a specific object or file type.
        !            91:  */
        !            92: /*ARGSUSED*/
        !            93: int
        !            94: eopnotsupp(void *v)
        !            95: {
        !            96:
        !            97:        return (EOPNOTSUPP);
        !            98: }
        !            99:
        !           100: /*
        !           101:  * Generic null operation, always returns success.
        !           102:  */
        !           103: /*ARGSUSED*/
        !           104: int
        !           105: nullop(void *v)
        !           106: {
        !           107:
        !           108:        return (0);
        !           109: }
        !           110:
        !           111: struct bdevsw *
        !           112: bdevsw_lookup(dev_t dev)
        !           113: {
        !           114:        return (&bdevsw[major(dev)]);
        !           115: }
        !           116:
        !           117: struct cdevsw *
        !           118: cdevsw_lookup(dev_t dev)
        !           119: {
        !           120:        return (&cdevsw[major(dev)]);
        !           121: }
        !           122:
        !           123: /*
        !           124:  * Convert a character device number to a block device number.
        !           125:  */
        !           126: dev_t
        !           127: chrtoblk(dev_t dev)
        !           128: {
        !           129:        int blkmaj;
        !           130:
        !           131:        if (major(dev) >= nchrdev || major(dev) >= nchrtoblktbl)
        !           132:                return (NODEV);
        !           133:        blkmaj = chrtoblktbl[major(dev)];
        !           134:        if (blkmaj == NODEV)
        !           135:                return (NODEV);
        !           136:        return (makedev(blkmaj, minor(dev)));
        !           137: }
        !           138:
        !           139: /*
        !           140:  * Convert a block device number to a character device number.
        !           141:  */
        !           142: dev_t
        !           143: blktochr(dev_t dev)
        !           144: {
        !           145:        int blkmaj = major(dev);
        !           146:        int i;
        !           147:
        !           148:        if (blkmaj >= nblkdev)
        !           149:                return (NODEV);
        !           150:        for (i = 0; i < nchrtoblktbl; i++)
        !           151:                if (blkmaj == chrtoblktbl[i])
        !           152:                        return (makedev(i, minor(dev)));
        !           153:        return (NODEV);
        !           154: }