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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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/buf.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();
#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*/
	eno_ioctl,	nulldev,	nulldev,	0,		(select_fcn_t *)mmselect,
	eno_mmap,		eno_strat,	eno_getc,	eno_putc,	0
    },
    {
	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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
	27	* Copyright (c) 1993 NeXT Computer, Inc.
	28	*
	29	* UNIX Device switch tables.
	30	*
	31	* HISTORY
	32	*
	33	* 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
	34	* enabled file descriptor pseudo-device.
	35	* 18 June 1993 ? at NeXT
	36	* Cleaned up a lot of stuff in this file.
	37	*/
	38
	39	#include <sys/param.h>
	40	#include <sys/systm.h>
	41	#include <sys/buf.h>
	42	#include <sys/ioctl.h>
	43	#include <sys/tty.h>
	44	#include <sys/conf.h>
	45
	46
	47	extern int nulldev();
	48
	49	struct bdevsw bdevsw[] =
	50	{
	51	/*
	52	* For block devices, every other block of 8 slots is
	53	* reserved to NeXT. The other slots are available for
	54	* the user. This way we can both add new entries without
	55	* running into each other. Be sure to fill in NeXT's
	56	* 8 reserved slots when you jump over us -- we'll do the
	57	* same for you.
	58	*/
	59
	60	/* 0 - 7 are reserved to NeXT */
	61
	62	NO_BDEVICE, /* 0*/
	63	NO_BDEVICE, /* 1*/
	64	NO_BDEVICE, /* 2*/
	65	NO_BDEVICE, /* 3*/
	66	NO_BDEVICE, /* 4*/
	67	NO_BDEVICE, /* 5*/
	68	NO_BDEVICE, /* 6*/
	69	NO_BDEVICE, /* 7*/
	70
	71	/* 8 - 15 are reserved to the user */
	72	NO_BDEVICE, /* 8*/
	73	NO_BDEVICE, /* 9*/
	74	NO_BDEVICE, /10/
	75	NO_BDEVICE, /11/
	76	NO_BDEVICE, /12/
	77	NO_BDEVICE, /13/
	78	NO_BDEVICE, /14/
	79	NO_BDEVICE, /15/
	80
	81	/* 16 - 23 are reserved to NeXT */
	82	NO_BDEVICE, /16/
	83	NO_BDEVICE, /17/
	84	NO_BDEVICE, /18/
	85	NO_BDEVICE, /18/
86	NO_BDEVICE, /20/
87	NO_BDEVICE, /21/
88	NO_BDEVICE, /22/
89	NO_BDEVICE, /23/
90	};
91
92	int nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
93
94	extern struct tty *km_tty[];
95	extern int consopen(), consclose(), consread(), conswrite(), consioctl(),
96	consselect(), cons_getc(), cons_putc();
97	extern int kmopen(),kmclose(),kmread(),kmwrite(),kmioctl(),
98	kmgetc(), kmputc(dev_t dev, char c);
99
100	extern int cttyopen(), cttyread(), cttywrite(), cttyioctl(), cttyselect();
101
102	extern int mmread(),mmwrite();
103	#define mmselect seltrue
104
105	#if 1
55e303ae A	106	#ifdef NPTY
	107	#undef NPTY
	108	#endif /* NPTY */
1c79356b A	109	#define NPTY 32
	110	#else /* 1 */
	111	#include <pty.h>
	112	#endif /* 1 */
	113	#if NPTY > 0
	114	extern struct tty *pt_tty[];
	115	extern int ptsopen(),ptsclose(),ptsread(),ptswrite(),ptsstop(),ptsputc();
	116	extern int ptcopen(),ptcclose(),ptcread(),ptcwrite(),ptcselect(),
	117	ptyioctl();
	118	#else
	119	#define ptsopen eno_opcl
	120	#define ptsclose eno_opcl
	121	#define ptsread eno_rdwrt
	122	#define ptswrite eno_rdwrt
	123	#define ptsstop nulldev
	124	#define ptsputc nulldev
	125
	126	#define ptcopen eno_opcl
	127	#define ptcclose eno_opcl
	128	#define ptcread eno_rdwrt
	129	#define ptcwrite eno_rdwrt
	130	#define ptcselect eno_select
	131	#define ptyioctl eno_ioctl
	132	#endif
	133
	134	extern int logopen(),logclose(),logread(),logioctl(),logselect();
	135	extern int seltrue();
	136
	137	struct cdevsw cdevsw[] =
	138	{
	139	/*
	140	* For character devices, every other block of 16 slots is
	141	* reserved to NeXT. The other slots are available for
	142	* the user. This way we can both add new entries without
	143	* running into each other. Be sure to fill in NeXT's
	144	* 16 reserved slots when you jump over us -- we'll do the
	145	* same for you.
	146	*/
	147
	148	/* 0 - 15 are reserved to NeXT */
	149
	150	{
	151	consopen, consclose, consread, conswrite, /* 0*/
	152	consioctl, nulldev, nulldev, 0, consselect,
55e303ae	153	eno_mmap, eno_strat, (getc_fcn_t )cons_getc, (putc_fcn_t )cons_putc, D_TTY
1c79356b A	154	},
	155	NO_CDEVICE, /* 1*/
	156	{
	157	cttyopen, nulldev, cttyread, cttywrite, /* 2*/
	158	cttyioctl, nulldev, nulldev, 0, cttyselect,
	159	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	160	},
	161	{
	162	nulldev, nulldev, mmread, mmwrite, /* 3*/
55e303ae	163	eno_ioctl, nulldev, nulldev, 0, (select_fcn_t *)mmselect,
1c79356b A	164	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	165	},
	166	{
	167	ptsopen, ptsclose, ptsread, ptswrite, /* 4*/
	168	ptyioctl, ptsstop, nulldev, pt_tty, ttselect,
	169	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	170	},
	171	{
	172	ptcopen, ptcclose, ptcread, ptcwrite, /* 5*/
	173	ptyioctl, nulldev, nulldev, 0, ptcselect,
	174	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	175	},
	176	{
	177	logopen, logclose, logread, eno_rdwrt, /* 6*/
	178	logioctl, eno_stop, nulldev, 0, logselect,
	179	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	180	},
	181	NO_CDEVICE, /* 7*/
	182	NO_CDEVICE, /* 8*/
	183	NO_CDEVICE, /* 9*/
	184	NO_CDEVICE, /10/
	185	NO_CDEVICE, /11/
	186	{
	187	kmopen, kmclose, kmread, kmwrite, /12/
	188	kmioctl, nulldev, nulldev, km_tty, ttselect,
	189	eno_mmap, eno_strat, kmgetc, kmputc, 0
	190	},
	191	NO_CDEVICE, /13/
	192	NO_CDEVICE, /14/
	193	NO_CDEVICE, /15/
	194
	195	/* 16 - 31 are reserved to the user */
	196	NO_CDEVICE, /16/
	197	NO_CDEVICE, /17/
	198	NO_CDEVICE, /18/
	199	NO_CDEVICE, /19/
	200	NO_CDEVICE, /20/
	201	NO_CDEVICE, /21/
	202	NO_CDEVICE, /22/
	203	NO_CDEVICE, /23/
	204	NO_CDEVICE, /24/
	205	NO_CDEVICE, /25/
	206	NO_CDEVICE, /26/
	207	NO_CDEVICE, /27/
	208	NO_CDEVICE, /28/
	209	NO_CDEVICE, /29/
	210	NO_CDEVICE, /30/
	211	NO_CDEVICE, /31/
	212
	213	/* 32 - 47 are reserved to NeXT */
	214	NO_CDEVICE, /32/
	215	NO_CDEVICE, /33/
	216	NO_CDEVICE, /34/
	217	NO_CDEVICE, /35/
	218	NO_CDEVICE, /36/
	219	/* 37 used to be for nvram */
	220	NO_CDEVICE, /37/
	221	NO_CDEVICE, /38/
	222	NO_CDEVICE, /39/
	223	NO_CDEVICE, /40/
	224	/* 41 used to be for fd */
	225	NO_CDEVICE, /41/
	226	NO_CDEVICE, /42/
	227	};
228	int nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
229
230
231	#include <sys/vnode.h> /* for VCHR and VBLK */
232	/*
233	* return true if a disk
234	*/
235	int
236	isdisk(dev, type)
237	dev_t dev;
238	int type;
239	{
9bccf70c A	240	dev_t maj = major(dev);
	241
	242	switch (type) {
	243	case VCHR:
	244	maj = chrtoblk(maj);
	245	if (maj == NODEV) {
	246	break;
	247	}
	248	/* FALL THROUGH */
	249	case VBLK:
	250	if (bdevsw[maj].d_type == D_DISK) {
	251	return (1);
	252	}
1c79356b A	253	break;
	254	}
	255	return(0);
	256	}
	257
	258	static int chrtoblktab[] = {
	259	/* CHR/ / BLK/ / CHR/ / BLK*/
	260	/* 0 / NODEV, / 1 */ NODEV,
	261	/* 2 / NODEV, / 3 */ NODEV,
	262	/* 4 / NODEV, / 5 */ NODEV,
	263	/* 6 / NODEV, / 7 */ NODEV,
	264	/* 8 / NODEV, / 9 */ NODEV,
	265	/* 10 / NODEV, / 11 */ NODEV,
	266	/* 12 / NODEV, / 13 */ NODEV,
	267	/* 14 / 6, / 15 */ NODEV,
	268	/* 16 / NODEV, / 17 */ NODEV,
	269	/* 18 / NODEV, / 19 */ NODEV,
	270	/* 20 / NODEV, / 21 */ NODEV,
	271	/* 22 / NODEV, / 23 */ NODEV,
	272	/* 24 / NODEV, / 25 */ NODEV,
	273	/* 26 / NODEV, / 27 */ NODEV,
	274	/* 28 / NODEV, / 29 */ NODEV,
	275	/* 30 / NODEV, / 31 */ NODEV,
	276	/* 32 / NODEV, / 33 */ NODEV,
	277	/* 34 / NODEV, / 35 */ NODEV,
	278	/* 36 / NODEV, / 37 */ NODEV,
	279	/* 38 / NODEV, / 39 */ NODEV,
	280	/* 40 / NODEV, / 41 */ 1,
	281	/* 42 / NODEV, / 43 */ NODEV,
	282	/* 44 */ NODEV,
	283	};
	284
	285	/*
	286	* convert chr dev to blk dev
	287	*/
	288	dev_t
	289	chrtoblk(dev)
	290	dev_t dev;
	291	{
	292	int blkmaj;
	293
	294	if (major(dev) >= nchrdev)
	295	return(NODEV);
	296	blkmaj = chrtoblktab[major(dev)];
	297	if (blkmaj == NODEV)
	298	return(NODEV);
	299	return(makedev(blkmaj, minor(dev)));
	300	}
	301
9bccf70c A	302	int
	303	chrtoblk_set(int cdev, int bdev)
	304	{
	305	if (cdev >= nchrdev)
	306	return (NODEV);
	307	if (bdev != NODEV && bdev >= nblkdev)
	308	return (NODEV);
	309	chrtoblktab[cdev] = bdev;
	310	return 0;
	311	}
	312
1c79356b A	313	/*
	314	* Returns true if dev is /dev/mem or /dev/kmem.
	315	*/
	316	int iskmemdev(dev)
	317	dev_t dev;
	318	{
	319
	320	return (major(dev) == 3 && minor(dev) < 2);
	321	}