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: }
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