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