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84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
/*-
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* Parts Copyright (c) 1995 Terrence R. Lambert
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* Copyright (c) 1995 Julian R. Elischer
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Terrence R. Lambert.
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* 4. The name Terrence R. Lambert may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``AS IS'' AND ANY
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* 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 TERRENCE R. LAMBERT 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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* $Id: kern_conf.c,v 1.2 1995/10/02 10:15:40 julian Exp $
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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extern d_open_t lkmenodev;
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/*
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* (re)place an entry in the bdevsw or cdevsw table
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* return the slot used in major(*descrip)
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*/
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#define ADDENTRY(TTYPE,NXXXDEV) \
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int TTYPE##_add(dev_t *descrip, \
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struct TTYPE *newentry, \
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struct TTYPE *oldentry) \
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{ \
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int i ; \
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if ( (int)*descrip == -1) { /* auto (0 is valid) */ \
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/* \
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* Search the table looking for a slot... \
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*/ \
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for (i = 0; i < NXXXDEV; i++) \
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if (TTYPE[i].d_open == lkmenodev) \
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break; /* found it! */ \
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/* out of allocable slots? */ \
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if (i == NXXXDEV) { \
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return ENFILE; \
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} \
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} else { /* assign */ \
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i = major(descrip); \
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if (i < 0 || i >= NXXXDEV) { \
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return EINVAL; \
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} \
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} \
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\
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/* maybe save old */ \
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if (oldentry) { \
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bcopy(&TTYPE[i], oldentry, sizeof(struct TTYPE)); \
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} \
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/* replace with new */ \
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bcopy(newentry, &TTYPE[i], sizeof(struct TTYPE)); \
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\
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/* done! */ \
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*descrip = makedev(i,0); \
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return 0; \
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} \
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ADDENTRY(bdevsw, nblkdev)
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ADDENTRY(cdevsw, nchrdev)
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