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/*-
* Parts Copyright (c) 1995 Terrence R. Lambert
* Copyright (c) 1995 Julian R. Elischer
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``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 TERRENCE R. LAMBERT 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.
*
* $Id: kern_conf.c,v 1.3 1995/10/04 08:58:00 julian Exp $
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/conf.h>
/*
* (re)place an entry in the bdevsw or cdevsw table
* return the slot used in major(*descrip)
*/
#define ADDENTRY(TTYPE,NXXXDEV) \
int TTYPE##_add(dev_t *descrip, \
struct TTYPE *newentry, \
struct TTYPE *oldentry) \
{ \
int i ; \
if ( (int)*descrip == -1) { /* auto (0 is valid) */ \
/* \
* Search the table looking for a slot... \
*/ \
for (i = 0; i < NXXXDEV; i++) \
if (TTYPE[i].d_open == NULL) \
break; /* found one! */ \
/* out of allocable slots? */ \
if (i == NXXXDEV) { \
return ENFILE; \
} \
} else { /* assign */ \
i = major(descrip); \
if (i < 0 || i >= NXXXDEV) { \
return EINVAL; \
} \
} \
\
/* maybe save old */ \
if (oldentry) { \
bcopy(&TTYPE[i], oldentry, sizeof(struct TTYPE)); \
} \
/* replace with new */ \
bcopy(newentry, &TTYPE[i], sizeof(struct TTYPE)); \
\
/* done! */ \
*descrip = makedev(i,0); \
return 0; \
} \
ADDENTRY(bdevsw, nblkdev)
ADDENTRY(cdevsw, nchrdev)
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