/* $OpenBSD: subr_xxx.c,v 1.17 2019/05/17 03:53:08 visa Exp $ */ /* $NetBSD: subr_xxx.c,v 1.10 1996/02/04 02:16:51 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)subr_xxx.c 8.1 (Berkeley) 6/10/93 */ /* * Miscellaneous trivial functions, including many * that are often inline-expanded or done in assembler. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/conf.h> #include <sys/smr.h> /* * Unsupported device function (e.g. writing to read-only device). */ int enodev(void) { return (ENODEV); } /* * Unconfigured device function; driver not configured. */ int enxio(void) { return (ENXIO); } /* * Unsupported ioctl function. */ int enoioctl(void) { return (ENOTTY); } /* * Unsupported system function. * This is used for an otherwise-reasonable operation * that is not supported by the current system binary. */ int enosys(void) { return (ENOSYS); } /* * Return error for operation not supported * on a specific object or file type. */ int eopnotsupp(void *v) { return (EOPNOTSUPP); } /* * Generic null operation, always returns success. */ int nullop(void *v) { return (0); } struct bdevsw * bdevsw_lookup(dev_t dev) { return (&bdevsw[major(dev)]); } struct cdevsw * cdevsw_lookup(dev_t dev) { return (&cdevsw[major(dev)]); } /* * Convert a character device number to a block device number. */ dev_t chrtoblk(dev_t dev) { int blkmaj; if (major(dev) >= nchrdev || major(dev) >= nchrtoblktbl) return (NODEV); blkmaj = chrtoblktbl[major(dev)]; if (blkmaj == NODEV) return (NODEV); return (makedev(blkmaj, minor(dev))); } /* * Convert a block device number to a character device number. */ dev_t blktochr(dev_t dev) { int blkmaj = major(dev); int i; if (blkmaj >= nblkdev) return (NODEV); for (i = 0; i < nchrtoblktbl; i++) if (blkmaj == chrtoblktbl[i]) return (makedev(i, minor(dev))); return (NODEV); } /* * Check that we're in a context where it's okay to sleep. */ void assertwaitok(void) { if (panicstr || db_active) return; splassert(IPL_NONE); SMR_ASSERT_NONCRITICAL(); #ifdef DIAGNOSTIC if (curcpu()->ci_mutex_level != 0) panic("assertwaitok: non-zero mutex count: %d", curcpu()->ci_mutex_level); #endif }