[apple/xnu.git] / bsd / dev / ppc / conf.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
 * Copyright (c) 1993 NeXT Computer, Inc.
 *
 * UNIX Device switch tables.
 *
 * HISTORY
 *
 * 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
 * 	enabled file descriptor pseudo-device.
 * 18 June 1993 ? at NeXT
 *	Cleaned up a lot of stuff in this file.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/conf.h>


extern int	nulldev();

struct bdevsw	bdevsw[] =
{
	/*
	 *	For block devices, every other block of 8 slots is 
	 *	reserved to NeXT.  The other slots are available for
	 *	the user.  This way we can both add new entries without
	 *	running into each other.  Be sure to fill in NeXT's
	 *	8 reserved slots when you jump over us -- we'll do the
	 *	same for you.
	 */

	/* 0 - 7 are reserved to NeXT */

	NO_BDEVICE,							/* 0*/
	NO_BDEVICE,							/* 1*/
	NO_BDEVICE,							/* 2*/
	NO_BDEVICE,							/* 3*/
	NO_BDEVICE,							/* 4*/
	NO_BDEVICE,							/* 5*/
	NO_BDEVICE,							/* 6*/
	NO_BDEVICE,							/* 7*/

	/* 8 - 15 are reserved to the user */
	NO_BDEVICE,							/* 8*/
	NO_BDEVICE,							/* 9*/
	NO_BDEVICE,							/*10*/
	NO_BDEVICE,							/*11*/
	NO_BDEVICE,							/*12*/
	NO_BDEVICE,							/*13*/
	NO_BDEVICE,							/*14*/
	NO_BDEVICE,							/*15*/

	/* 16 - 23 are reserved to NeXT */
	NO_BDEVICE,							/*16*/
	NO_BDEVICE,							/*17*/
	NO_BDEVICE,							/*18*/
	NO_BDEVICE,							/*18*/
	NO_BDEVICE,							/*20*/
	NO_BDEVICE,							/*21*/
	NO_BDEVICE,							/*22*/
	NO_BDEVICE,							/*23*/
};

int	nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);

extern struct tty *km_tty[];
extern int	consopen(), consclose(), consread(), conswrite(), consioctl(),
		consselect(), cons_getc(), cons_putc();
extern int	kmopen(),kmclose(),kmread(),kmwrite(),kmioctl(),
		kmgetc(), kmputc(dev_t dev, char c);

extern int	cttyopen(), cttyread(), cttywrite(), cttyioctl(), cttyselect();

extern int 	mmread(),mmwrite(),mmioctl();
#define	mmselect	seltrue

#if 1
#ifdef NPTY
#undef NPTY
#endif /* NPTY */
#define NPTY 32
#else /* 1 */
#include <pty.h>
#endif /* 1 */
#if NPTY > 0
extern struct tty *pt_tty[];
extern int	ptsopen(),ptsclose(),ptsread(),ptswrite(),ptsstop(),ptsputc();
extern int	ptcopen(),ptcclose(),ptcread(),ptcwrite(),ptcselect(),
		ptyioctl();
#else
#define ptsopen		eno_opcl
#define ptsclose	eno_opcl
#define ptsread		eno_rdwrt
#define ptswrite	eno_rdwrt
#define	ptsstop		nulldev
#define ptsputc		nulldev

#define ptcopen		eno_opcl
#define ptcclose	eno_opcl
#define ptcread		eno_rdwrt
#define ptcwrite	eno_rdwrt
#define	ptcselect	eno_select
#define ptyioctl	eno_ioctl
#endif

extern int	logopen(),logclose(),logread(),logioctl(),logselect();
extern int	seltrue();

struct cdevsw	cdevsw[] =
{
	/*
	 *	For character devices, every other block of 16 slots is
	 *	reserved to NeXT.  The other slots are available for
	 *	the user.  This way we can both add new entries without
	 *	running into each other.  Be sure to fill in NeXT's
	 *	16 reserved slots when you jump over us -- we'll do the
	 *	same for you.
	 */

	/* 0 - 15 are reserved to NeXT */

    {
	consopen,	consclose,	consread,	conswrite,	/* 0*/
	consioctl,	nulldev,	nulldev,	0,	consselect,
	eno_mmap,	eno_strat,	(getc_fcn_t *)cons_getc,	(putc_fcn_t *)cons_putc, D_TTY
   },
    NO_CDEVICE,								/* 1*/
    {
	cttyopen,	nulldev,	cttyread,	cttywrite,	/* 2*/
	cttyioctl,	nulldev,	nulldev,	0,		cttyselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	nulldev,	nulldev,	mmread,		mmwrite,	/* 3*/
	mmioctl,	nulldev,	nulldev,	0,		(select_fcn_t *)mmselect,
	eno_mmap,		eno_strat,	eno_getc,	eno_putc,	D_DISK
    },
    {
	ptsopen,	ptsclose,	ptsread,	ptswrite,	/* 4*/
	ptyioctl,	ptsstop,	nulldev,	pt_tty,		ttselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	ptcopen,	ptcclose,	ptcread,	ptcwrite,	/* 5*/
	ptyioctl,	nulldev,	nulldev,	0,		ptcselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	logopen,	logclose,	logread,	eno_rdwrt,	/* 6*/
	logioctl,	eno_stop,	nulldev,	0,		logselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	0
    },
    NO_CDEVICE,								/* 7*/
    NO_CDEVICE,								/* 8*/
    NO_CDEVICE,								/* 9*/
    NO_CDEVICE,								/*10*/
    NO_CDEVICE,								/*11*/
    {
	kmopen,		kmclose,	kmread,		kmwrite,	/*12*/
	kmioctl,	nulldev,	nulldev,	km_tty,		ttselect,
	eno_mmap,	eno_strat,	kmgetc,		kmputc,		0
    },
    NO_CDEVICE,								/*13*/
    NO_CDEVICE,								/*14*/
    NO_CDEVICE,								/*15*/

	/* 16 - 31 are reserved to the user */
    NO_CDEVICE,								/*16*/
    NO_CDEVICE,								/*17*/
    NO_CDEVICE,								/*18*/
    NO_CDEVICE,								/*19*/
    NO_CDEVICE,								/*20*/
    NO_CDEVICE,								/*21*/
    NO_CDEVICE,								/*22*/
    NO_CDEVICE,								/*23*/
    NO_CDEVICE,								/*24*/
    NO_CDEVICE,								/*25*/
    NO_CDEVICE,								/*26*/
    NO_CDEVICE,								/*27*/
    NO_CDEVICE,								/*28*/
    NO_CDEVICE,								/*29*/
    NO_CDEVICE,								/*30*/
    NO_CDEVICE,								/*31*/

	/* 32 - 47 are reserved to NeXT */
    NO_CDEVICE,								/*32*/
    NO_CDEVICE,								/*33*/
    NO_CDEVICE,								/*34*/
    NO_CDEVICE,								/*35*/
    NO_CDEVICE,								/*36*/
	/* 37 used to be for nvram */
    NO_CDEVICE,								/*37*/
    NO_CDEVICE,								/*38*/
    NO_CDEVICE,								/*39*/
    NO_CDEVICE,								/*40*/
	/* 41 used to be for fd */
    NO_CDEVICE,								/*41*/
    NO_CDEVICE,								/*42*/
};
int	nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);


#include	<sys/vnode.h> /* for VCHR and VBLK */
/*
 * return true if a disk
 */
int
isdisk(dev, type)
	dev_t dev;
	int type;
{
	dev_t	maj = major(dev);

	switch (type) {
	case VCHR:
		maj = chrtoblk(maj);
		if (maj == NODEV) {
			break;
		}
		/* FALL THROUGH */
	case VBLK:
		if (bdevsw[maj].d_type == D_DISK) {
			return (1);
		}
		break;
	}
	return(0);
}

static int chrtoblktab[] = {
	/* CHR*/	/* BLK*/	/* CHR*/	/* BLK*/
	/*  0 */	NODEV,		/*  1 */	NODEV,
	/*  2 */	NODEV,		/*  3 */	NODEV,
	/*  4 */	NODEV,		/*  5 */	NODEV,
	/*  6 */	NODEV,		/*  7 */	NODEV,
	/*  8 */	NODEV,		/*  9 */	NODEV,
	/* 10 */	NODEV,		/* 11 */	NODEV,
	/* 12 */	NODEV,		/* 13 */	NODEV,
	/* 14 */	6,		/* 15 */	NODEV,
	/* 16 */	NODEV,		/* 17 */	NODEV,
	/* 18 */	NODEV,		/* 19 */	NODEV,
	/* 20 */	NODEV,		/* 21 */	NODEV,
	/* 22 */	NODEV,		/* 23 */	NODEV,
	/* 24 */	NODEV,		/* 25 */	NODEV,
	/* 26 */	NODEV,		/* 27 */	NODEV,
	/* 28 */	NODEV,		/* 29 */	NODEV,
	/* 30 */	NODEV,		/* 31 */	NODEV,
	/* 32 */	NODEV,		/* 33 */	NODEV,
	/* 34 */	NODEV,		/* 35 */	NODEV,
	/* 36 */	NODEV,		/* 37 */	NODEV,
	/* 38 */	NODEV,		/* 39 */	NODEV,
	/* 40 */	NODEV,		/* 41 */	1,
	/* 42 */	NODEV,		/* 43 */	NODEV,
	/* 44 */	NODEV,
};

/*
 * convert chr dev to blk dev
 */
dev_t
chrtoblk(dev)
	dev_t dev;
{
	int blkmaj;

	if (major(dev) >= nchrdev)
		return(NODEV);
	blkmaj = chrtoblktab[major(dev)];
	if (blkmaj == NODEV)
		return(NODEV);
	return(makedev(blkmaj, minor(dev)));
}

int
chrtoblk_set(int cdev, int bdev)
{
	if (cdev >= nchrdev)
		return (NODEV);
	if (bdev != NODEV && bdev >= nblkdev)
		return (NODEV);
	chrtoblktab[cdev] = bdev;
	return 0;
}

/*
 * Returns true if dev is /dev/mem or /dev/kmem.
 */
int iskmemdev(dev)
	dev_t dev;
{

	return (major(dev) == 3 && minor(dev) < 2);
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
	30	* Copyright (c) 1993 NeXT Computer, Inc.
	31	*
	32	* UNIX Device switch tables.
	33	*
	34	* HISTORY
	35	*
	36	* 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
	37	* enabled file descriptor pseudo-device.
	38	* 18 June 1993 ? at NeXT
	39	* Cleaned up a lot of stuff in this file.
	40	*/
	41
	42	#include <sys/param.h>
	43	#include <sys/systm.h>
1c79356b A	44	#include <sys/ioctl.h>
	45	#include <sys/tty.h>
	46	#include <sys/conf.h>
	47
	48
	49	extern int nulldev();
	50
	51	struct bdevsw bdevsw[] =
	52	{
	53	/*
	54	* For block devices, every other block of 8 slots is
	55	* reserved to NeXT. The other slots are available for
	56	* the user. This way we can both add new entries without
	57	* running into each other. Be sure to fill in NeXT's
	58	* 8 reserved slots when you jump over us -- we'll do the
	59	* same for you.
	60	*/
	61
	62	/* 0 - 7 are reserved to NeXT */
	63
	64	NO_BDEVICE, /* 0*/
	65	NO_BDEVICE, /* 1*/
	66	NO_BDEVICE, /* 2*/
	67	NO_BDEVICE, /* 3*/
	68	NO_BDEVICE, /* 4*/
	69	NO_BDEVICE, /* 5*/
	70	NO_BDEVICE, /* 6*/
	71	NO_BDEVICE, /* 7*/
	72
	73	/* 8 - 15 are reserved to the user */
	74	NO_BDEVICE, /* 8*/
	75	NO_BDEVICE, /* 9*/
	76	NO_BDEVICE, /10/
	77	NO_BDEVICE, /11/
	78	NO_BDEVICE, /12/
	79	NO_BDEVICE, /13/
	80	NO_BDEVICE, /14/
	81	NO_BDEVICE, /15/
	82
	83	/* 16 - 23 are reserved to NeXT */
	84	NO_BDEVICE, /16/
	85	NO_BDEVICE, /17/
	86	NO_BDEVICE, /18/
	87	NO_BDEVICE, /18/
	88	NO_BDEVICE, /20/
	89	NO_BDEVICE, /21/
	90	NO_BDEVICE, /22/
	91	NO_BDEVICE, /23/
	92	};
	93
	94	int nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
	95
	96	extern struct tty *km_tty[];
	97	extern int consopen(), consclose(), consread(), conswrite(), consioctl(),
	98	consselect(), cons_getc(), cons_putc();
	99	extern int kmopen(),kmclose(),kmread(),kmwrite(),kmioctl(),
	100	kmgetc(), kmputc(dev_t dev, char c);
	101
	102	extern int cttyopen(), cttyread(), cttywrite(), cttyioctl(), cttyselect();
	103
91447636	104	extern int mmread(),mmwrite(),mmioctl();
1c79356b A	105	#define mmselect seltrue
	106
	107	#if 1
55e303ae A	108	#ifdef NPTY
	109	#undef NPTY
	110	#endif /* NPTY */
1c79356b A	111	#define NPTY 32
	112	#else /* 1 */
	113	#include <pty.h>
	114	#endif /* 1 */
	115	#if NPTY > 0
	116	extern struct tty *pt_tty[];
	117	extern int ptsopen(),ptsclose(),ptsread(),ptswrite(),ptsstop(),ptsputc();
	118	extern int ptcopen(),ptcclose(),ptcread(),ptcwrite(),ptcselect(),
	119	ptyioctl();
	120	#else
	121	#define ptsopen eno_opcl
	122	#define ptsclose eno_opcl
	123	#define ptsread eno_rdwrt
	124	#define ptswrite eno_rdwrt
	125	#define ptsstop nulldev
	126	#define ptsputc nulldev
	127
	128	#define ptcopen eno_opcl
	129	#define ptcclose eno_opcl
	130	#define ptcread eno_rdwrt
	131	#define ptcwrite eno_rdwrt
	132	#define ptcselect eno_select
	133	#define ptyioctl eno_ioctl
	134	#endif
	135
	136	extern int logopen(),logclose(),logread(),logioctl(),logselect();
	137	extern int seltrue();
	138
	139	struct cdevsw cdevsw[] =
	140	{
	141	/*
	142	* For character devices, every other block of 16 slots is
	143	* reserved to NeXT. The other slots are available for
	144	* the user. This way we can both add new entries without
	145	* running into each other. Be sure to fill in NeXT's
	146	* 16 reserved slots when you jump over us -- we'll do the
	147	* same for you.
	148	*/
	149
	150	/* 0 - 15 are reserved to NeXT */
	151
	152	{
	153	consopen, consclose, consread, conswrite, /* 0*/
	154	consioctl, nulldev, nulldev, 0, consselect,
55e303ae	155	eno_mmap, eno_strat, (getc_fcn_t )cons_getc, (putc_fcn_t )cons_putc, D_TTY
1c79356b A	156	},
	157	NO_CDEVICE, /* 1*/
	158	{
	159	cttyopen, nulldev, cttyread, cttywrite, /* 2*/
	160	cttyioctl, nulldev, nulldev, 0, cttyselect,
	161	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	162	},
	163	{
	164	nulldev, nulldev, mmread, mmwrite, /* 3*/
91447636 A	165	mmioctl, nulldev, nulldev, 0, (select_fcn_t *)mmselect,
91447636 A	166	eno_mmap, eno_strat, eno_getc, eno_putc, D_DISK
1c79356b A	167	},
	168	{
	169	ptsopen, ptsclose, ptsread, ptswrite, /* 4*/
	170	ptyioctl, ptsstop, nulldev, pt_tty, ttselect,
	171	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	172	},
	173	{
	174	ptcopen, ptcclose, ptcread, ptcwrite, /* 5*/
	175	ptyioctl, nulldev, nulldev, 0, ptcselect,
	176	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	177	},
	178	{
	179	logopen, logclose, logread, eno_rdwrt, /* 6*/
	180	logioctl, eno_stop, nulldev, 0, logselect,
	181	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	182	},
	183	NO_CDEVICE, /* 7*/
	184	NO_CDEVICE, /* 8*/
	185	NO_CDEVICE, /* 9*/
	186	NO_CDEVICE, /10/
	187	NO_CDEVICE, /11/
	188	{
	189	kmopen, kmclose, kmread, kmwrite, /12/
	190	kmioctl, nulldev, nulldev, km_tty, ttselect,
	191	eno_mmap, eno_strat, kmgetc, kmputc, 0
	192	},
	193	NO_CDEVICE, /13/
	194	NO_CDEVICE, /14/
	195	NO_CDEVICE, /15/
	196
	197	/* 16 - 31 are reserved to the user */
	198	NO_CDEVICE, /16/
	199	NO_CDEVICE, /17/
	200	NO_CDEVICE, /18/
	201	NO_CDEVICE, /19/
	202	NO_CDEVICE, /20/
	203	NO_CDEVICE, /21/
	204	NO_CDEVICE, /22/
	205	NO_CDEVICE, /23/
	206	NO_CDEVICE, /24/
	207	NO_CDEVICE, /25/
	208	NO_CDEVICE, /26/
	209	NO_CDEVICE, /27/
	210	NO_CDEVICE, /28/
	211	NO_CDEVICE, /29/
	212	NO_CDEVICE, /30/
	213	NO_CDEVICE, /31/
	214
	215	/* 32 - 47 are reserved to NeXT */
	216	NO_CDEVICE, /32/
	217	NO_CDEVICE, /33/
	218	NO_CDEVICE, /34/
	219	NO_CDEVICE, /35/
	220	NO_CDEVICE, /36/
	221	/* 37 used to be for nvram */
	222	NO_CDEVICE, /37/
	223	NO_CDEVICE, /38/
	224	NO_CDEVICE, /39/
	225	NO_CDEVICE, /40/
	226	/* 41 used to be for fd */
	227	NO_CDEVICE, /41/
	228	NO_CDEVICE, /42/
	229	};
	230	int nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
231
232
233	#include <sys/vnode.h> /* for VCHR and VBLK */
234	/*
235	* return true if a disk
236	*/
237	int
238	isdisk(dev, type)
239	dev_t dev;
240	int type;
241	{
9bccf70c A	242	dev_t maj = major(dev);
	243
	244	switch (type) {
	245	case VCHR:
	246	maj = chrtoblk(maj);
	247	if (maj == NODEV) {
	248	break;
	249	}
	250	/* FALL THROUGH */
	251	case VBLK:
	252	if (bdevsw[maj].d_type == D_DISK) {
	253	return (1);
	254	}
1c79356b A	255	break;
	256	}
	257	return(0);
	258	}
	259
	260	static int chrtoblktab[] = {
	261	/* CHR/ / BLK/ / CHR/ / BLK*/
	262	/* 0 / NODEV, / 1 */ NODEV,
	263	/* 2 / NODEV, / 3 */ NODEV,
	264	/* 4 / NODEV, / 5 */ NODEV,
	265	/* 6 / NODEV, / 7 */ NODEV,
	266	/* 8 / NODEV, / 9 */ NODEV,
	267	/* 10 / NODEV, / 11 */ NODEV,
	268	/* 12 / NODEV, / 13 */ NODEV,
	269	/* 14 / 6, / 15 */ NODEV,
	270	/* 16 / NODEV, / 17 */ NODEV,
	271	/* 18 / NODEV, / 19 */ NODEV,
	272	/* 20 / NODEV, / 21 */ NODEV,
	273	/* 22 / NODEV, / 23 */ NODEV,
	274	/* 24 / NODEV, / 25 */ NODEV,
	275	/* 26 / NODEV, / 27 */ NODEV,
	276	/* 28 / NODEV, / 29 */ NODEV,
	277	/* 30 / NODEV, / 31 */ NODEV,
	278	/* 32 / NODEV, / 33 */ NODEV,
	279	/* 34 / NODEV, / 35 */ NODEV,
	280	/* 36 / NODEV, / 37 */ NODEV,
	281	/* 38 / NODEV, / 39 */ NODEV,
	282	/* 40 / NODEV, / 41 */ 1,
	283	/* 42 / NODEV, / 43 */ NODEV,
	284	/* 44 */ NODEV,
	285	};
	286
	287	/*
	288	* convert chr dev to blk dev
	289	*/
	290	dev_t
	291	chrtoblk(dev)
	292	dev_t dev;
	293	{
	294	int blkmaj;
	295
	296	if (major(dev) >= nchrdev)
	297	return(NODEV);
	298	blkmaj = chrtoblktab[major(dev)];
	299	if (blkmaj == NODEV)
	300	return(NODEV);
	301	return(makedev(blkmaj, minor(dev)));
	302	}
	303
9bccf70c A	304	int
	305	chrtoblk_set(int cdev, int bdev)
	306	{
	307	if (cdev >= nchrdev)
	308	return (NODEV);
	309	if (bdev != NODEV && bdev >= nblkdev)
	310	return (NODEV);
	311	chrtoblktab[cdev] = bdev;
	312	return 0;
	313	}
	314
1c79356b A	315	/*
	316	* Returns true if dev is /dev/mem or /dev/kmem.
	317	*/
	318	int iskmemdev(dev)
	319	dev_t dev;
	320	{
	321
	322	return (major(dev) == 3 && minor(dev) < 2);
	323	}