[apple/xnu.git] / bsd / dev / i386 / conf.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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	cnopen(),cnclose(),cnread(),cnwrite(),cnioctl(),
		cnselect(),cngetc(), cnputc(dev_t dev, char c);
extern int	kmopen(),kmclose(),kmread(),kmwrite(),kmioctl(),
		kmgetc(), kmputc(dev_t dev, char c);
extern int	sgopen(),sgclose(), sgioctl();

#if NVOL > 0
extern int	volopen(),volclose(),volioctl();
#else
#define	volopen		eno_opcl
#define	volclose	eno_opcl
#define	volioctl	eno_ioctl
#endif

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

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

#include <pty.h>
#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	fdesc_open(), fdesc_read(), fdesc_write(),
		fdesc_ioctl(), fdesc_select();

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 */

    {
	cnopen,		cnclose,	cnread,		cnwrite,	/* 0*/
	cnioctl,	nulldev,	nulldev,	0,		cnselect,
	eno_mmap,	eno_strat,	cngetc,		cnputc, 	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,		mmselect,
	mmmmap,		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 */
    {
	fdesc_open,	eno_opcl,	fdesc_read,	fdesc_write,	/*32*/
	fdesc_ioctl,	eno_stop,	eno_reset,	0,		fdesc_select,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	0
    },
#if 1
   NO_CDEVICE,
#else
    {
	sgopen,		sgclose,	eno_rdwrt,	eno_rdwrt,	/*33*/
	sgioctl,	eno_stop,	eno_reset,	0,		eno_select,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TAPE
    },
#endif
    NO_CDEVICE,								/*34*/
    NO_CDEVICE,								/*35*/
    NO_CDEVICE,								/*36*/
    NO_CDEVICE,								/*37*/
    NO_CDEVICE,								/*38*/
    NO_CDEVICE,								/*39*/
    NO_CDEVICE,								/*40*/
    NO_CDEVICE,								/*41*/
    {
	volopen,	volclose,	eno_rdwrt,	eno_rdwrt,	/*42*/
	volioctl,	eno_stop,	eno_reset,	0,		seltrue,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	0
    },
};
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 (-1);
	if (bdev != NODEV && bdev >= nblkdev)
		return (-1);
	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	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
	24	* Copyright (c) 1993 NeXT Computer, Inc.
	25	*
	26	* UNIX Device switch tables.
	27	*
	28	* HISTORY
	29	*
	30	* 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
	31	* enabled file descriptor pseudo-device.
	32	* 18 June 1993 ? at NeXT
	33	* Cleaned up a lot of stuff in this file.
	34	*/
	35
	36	#include <sys/param.h>
	37	#include <sys/systm.h>
	38	#include <sys/buf.h>
	39	#include <sys/ioctl.h>
	40	#include <sys/tty.h>
	41	#include <sys/conf.h>
	42
	43
	44	extern int nulldev();
	45
	46	struct bdevsw bdevsw[] =
	47	{
	48	/*
	49	* For block devices, every other block of 8 slots is
	50	* reserved to NeXT. The other slots are available for
	51	* the user. This way we can both add new entries without
	52	* running into each other. Be sure to fill in NeXT's
	53	* 8 reserved slots when you jump over us -- we'll do the
	54	* same for you.
	55	*/
	56
	57	/* 0 - 7 are reserved to NeXT */
	58
	59	NO_BDEVICE, /* 0*/
	60	NO_BDEVICE, /* 1*/
	61	NO_BDEVICE, /* 2*/
	62	NO_BDEVICE, /* 3*/
	63	NO_BDEVICE, /* 4*/
	64	NO_BDEVICE, /* 5*/
	65	NO_BDEVICE, /* 6*/
	66	NO_BDEVICE, /* 7*/
	67
	68	/* 8 - 15 are reserved to the user */
	69	NO_BDEVICE, /* 8*/
	70	NO_BDEVICE, /* 9*/
	71	NO_BDEVICE, /10/
	72	NO_BDEVICE, /11/
	73	NO_BDEVICE, /12/
	74	NO_BDEVICE, /13/
	75	NO_BDEVICE, /14/
	76	NO_BDEVICE, /15/
	77
	78	/* 16 - 23 are reserved to NeXT */
	79	NO_BDEVICE, /16/
	80	NO_BDEVICE, /17/
	81	NO_BDEVICE, /18/
	82	NO_BDEVICE, /18/
83	NO_BDEVICE, /20/
84	NO_BDEVICE, /21/
85	NO_BDEVICE, /22/
86	NO_BDEVICE, /23/
87	};
88
89	int nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
90
91	extern struct tty *km_tty[];
92	extern int cnopen(),cnclose(),cnread(),cnwrite(),cnioctl(),
93	cnselect(),cngetc(), cnputc(dev_t dev, char c);
94	extern int kmopen(),kmclose(),kmread(),kmwrite(),kmioctl(),
95	kmgetc(), kmputc(dev_t dev, char c);
96	extern int sgopen(),sgclose(), sgioctl();
97
98	#if NVOL > 0
99	extern int volopen(),volclose(),volioctl();
100	#else
101	#define volopen eno_opcl
102	#define volclose eno_opcl
103	#define volioctl eno_ioctl
104	#endif
105
106	extern int cttyopen(), cttyread(), cttywrite(), cttyioctl(), cttyselect();
107
108	extern int mmread(),mmwrite();
109	#define mmselect seltrue
110	#define mmmmap eno_mmap
111
112	#include <pty.h>
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 fdesc_open(), fdesc_read(), fdesc_write(),
136	fdesc_ioctl(), fdesc_select();
137
138	extern int seltrue();
139
140	struct cdevsw cdevsw[] =
141	{
142	/*
143	* For character devices, every other block of 16 slots is
144	* reserved to NeXT. The other slots are available for
145	* the user. This way we can both add new entries without
146	* running into each other. Be sure to fill in NeXT's
147	* 16 reserved slots when you jump over us -- we'll do the
148	* same for you.
149	*/
150
151	/* 0 - 15 are reserved to NeXT */
152
153	{
154	cnopen, cnclose, cnread, cnwrite, /* 0*/
155	cnioctl, nulldev, nulldev, 0, cnselect,
156	eno_mmap, eno_strat, cngetc, cnputc, D_TTY
157	},
158	NO_CDEVICE, /* 1*/
159	{
160	cttyopen, nulldev, cttyread, cttywrite, /* 2*/
161	cttyioctl, nulldev, nulldev, 0, cttyselect,
162	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
163	},
164	{
165	nulldev, nulldev, mmread, mmwrite, /* 3*/
166	eno_ioctl, nulldev, nulldev, 0, mmselect,
167	mmmmap, eno_strat, eno_getc, eno_putc, 0
168	},
169	{
170	ptsopen, ptsclose, ptsread, ptswrite, /* 4*/
171	ptyioctl, ptsstop, nulldev, pt_tty, ttselect,
172	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
173	},
174	{
175	ptcopen, ptcclose, ptcread, ptcwrite, /* 5*/
176	ptyioctl, nulldev, nulldev, 0, ptcselect,
177	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
178	},
179	{
180	logopen, logclose, logread, eno_rdwrt, /* 6*/
181	logioctl, eno_stop, nulldev, 0, logselect,
182	eno_mmap, eno_strat, eno_getc, eno_putc, 0
183	},
184	NO_CDEVICE, /* 7*/
185	NO_CDEVICE, /* 8*/
186	NO_CDEVICE, /* 9*/
187	NO_CDEVICE, /10/
188	NO_CDEVICE, /11/
189	{
190	kmopen, kmclose, kmread, kmwrite, /12/
191	kmioctl, nulldev, nulldev, km_tty, ttselect,
192	eno_mmap, eno_strat, kmgetc, kmputc, 0
193	},
194	NO_CDEVICE, /13/
195	NO_CDEVICE, /14/
196	NO_CDEVICE, /15/
197
198	/* 16 - 31 are reserved to the user */
199	NO_CDEVICE, /16/
200	NO_CDEVICE, /17/
201	NO_CDEVICE, /18/
202	NO_CDEVICE, /19/
203	NO_CDEVICE, /20/
204	NO_CDEVICE, /21/
205	NO_CDEVICE, /22/
206	NO_CDEVICE, /23/
207	NO_CDEVICE, /24/
208	NO_CDEVICE, /25/
209	NO_CDEVICE, /26/
210	NO_CDEVICE, /27/
211	NO_CDEVICE, /28/
212	NO_CDEVICE, /29/
213	NO_CDEVICE, /30/
214	NO_CDEVICE, /31/
215
216	/* 32 - 47 are reserved to NeXT */
217	{
218	fdesc_open, eno_opcl, fdesc_read, fdesc_write, /32/
219	fdesc_ioctl, eno_stop, eno_reset, 0, fdesc_select,
220	eno_mmap, eno_strat, eno_getc, eno_putc, 0
221	},
222	#if 1
223	NO_CDEVICE,
224	#else
225	{
226	sgopen, sgclose, eno_rdwrt, eno_rdwrt, /33/
227	sgioctl, eno_stop, eno_reset, 0, eno_select,
228	eno_mmap, eno_strat, eno_getc, eno_putc, D_TAPE
229	},
230	#endif
231	NO_CDEVICE, /34/
232	NO_CDEVICE, /35/
233	NO_CDEVICE, /36/
234	NO_CDEVICE, /37/
235	NO_CDEVICE, /38/
236	NO_CDEVICE, /39/
237	NO_CDEVICE, /40/
238	NO_CDEVICE, /41/
239	{
240	volopen, volclose, eno_rdwrt, eno_rdwrt, /42/
241	volioctl, eno_stop, eno_reset, 0, seltrue,
242	eno_mmap, eno_strat, eno_getc, eno_putc, 0
243	},
244	};
245	int nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
246
247
248	#include <sys/vnode.h> /* for VCHR and VBLK */
249	/*
250	* return true if a disk
251	*/
252	int
253	isdisk(dev, type)
254	dev_t dev;
255	int type;
256	{
9bccf70c A	257	dev_t maj = major(dev);
	258
	259	switch (type) {
	260	case VCHR:
	261	maj = chrtoblk(maj);
	262	if (maj == NODEV) {
	263	break;
	264	}
	265	/* FALL THROUGH */
	266	case VBLK:
	267	if (bdevsw[maj].d_type == D_DISK) {
	268	return (1);
	269	}
1c79356b A	270	break;
	271	}
	272	return(0);
	273	}
	274
	275	static int chrtoblktab[] = {
	276	/* CHR/ / BLK/ / CHR/ / BLK*/
	277	/* 0 / NODEV, / 1 */ NODEV,
	278	/* 2 / NODEV, / 3 */ NODEV,
	279	/* 4 / NODEV, / 5 */ NODEV,
	280	/* 6 / NODEV, / 7 */ NODEV,
	281	/* 8 / NODEV, / 9 */ NODEV,
	282	/* 10 / NODEV, / 11 */ NODEV,
	283	/* 12 / NODEV, / 13 */ NODEV,
	284	/* 14 / 6, / 15 */ NODEV,
	285	/* 16 / NODEV, / 17 */ NODEV,
	286	/* 18 / NODEV, / 19 */ NODEV,
	287	/* 20 / NODEV, / 21 */ NODEV,
	288	/* 22 / NODEV, / 23 */ NODEV,
	289	/* 24 / NODEV, / 25 */ NODEV,
	290	/* 26 / NODEV, / 27 */ NODEV,
	291	/* 28 / NODEV, / 29 */ NODEV,
	292	/* 30 / NODEV, / 31 */ NODEV,
	293	/* 32 / NODEV, / 33 */ NODEV,
	294	/* 34 / NODEV, / 35 */ NODEV,
	295	/* 36 / NODEV, / 37 */ NODEV,
	296	/* 38 / NODEV, / 39 */ NODEV,
	297	/* 40 / NODEV, / 41 */ 1,
	298	/* 42 / NODEV, / 43 */ NODEV,
	299	/* 44 */ NODEV,
	300	};
	301
	302	/*
	303	* convert chr dev to blk dev
	304	*/
	305	dev_t
	306	chrtoblk(dev)
	307	dev_t dev;
	308	{
	309	int blkmaj;
	310
	311	if (major(dev) >= nchrdev)
	312	return(NODEV);
	313	blkmaj = chrtoblktab[major(dev)];
	314	if (blkmaj == NODEV)
	315	return(NODEV);
	316	return(makedev(blkmaj, minor(dev)));
	317	}
	318
9bccf70c A	319	int
	320	chrtoblk_set(int cdev, int bdev)
	321	{
	322	if (cdev >= nchrdev)
	323	return (-1);
	324	if (bdev != NODEV && bdev >= nblkdev)
	325	return (-1);
	326	chrtoblktab[cdev] = bdev;
	327	return 0;
	328	}
	329
1c79356b A	330	/*
	331	* Returns true if dev is /dev/mem or /dev/kmem.
	332	*/
	333	int iskmemdev(dev)
	334	dev_t dev;
	335	{
	336
	337	return (major(dev) == 3 && minor(dev) < 2);
	338	}