[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/ioctl.h>
#include <sys/tty.h>
#include <sys/conf.h>

/* Prototypes that should be elsewhere: */
extern int	isdisk(dev_t dev, int type);
extern dev_t	chrtoblk(dev_t dev);
extern int	chrtoblk_set(int cdev, int bdev);
extern int	iskmemdev(dev_t dev);

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 d_open_t		cnopen;
extern d_close_t	cnclose;
extern d_read_t		cnread;
extern d_write_t	cnwrite;
extern d_ioctl_t	cnioctl;
extern d_select_t	cnselect;
extern d_getc_t		cngetc;
extern d_putc_t		cnputc;
extern d_open_t		kmopen;
extern d_close_t	kmclose;
extern d_read_t		kmread;
extern d_write_t	kmwrite;
extern d_ioctl_t	kmioctl;
extern d_getc_t		kmgetc;
extern d_putc_t		kmputc;
extern d_open_t		sgopen;
extern d_close_t	sgclose;
extern d_ioctl_t	sgioctl;

#if NVOL > 0
extern d_open_t		volopen;
extern d_close_t	volclose;
extern d_ioctl_t	volioctl;
#else
#define	volopen		eno_opcl
#define	volclose	eno_opcl
#define	volioctl	eno_ioctl
#endif

extern d_open_t		cttyopen;
extern d_read_t		cttyread;
extern d_write_t	cttywrite;
extern d_ioctl_t	cttyioctl;
extern d_select_t	cttyselect;

extern d_read_t		mmread;
extern d_write_t	mmwrite;
extern d_ioctl_t	mmioctl;
#define	mmselect	(select_fcn_t *)seltrue
#define mmmmap		eno_mmap

#include <pty.h>
#if NPTY > 0
extern struct tty *pt_tty[];
extern d_open_t		ptsopen;
extern d_close_t	ptsclose;
extern d_read_t		ptsread;
extern d_write_t	ptswrite;
extern d_stop_t		ptsstop;
extern d_putc_t		ptsputc;
extern d_open_t		ptcopen;
extern d_close_t	ptcclose;
extern d_read_t		ptcread;
extern d_write_t	ptcwrite;
extern d_select_t	ptcselect;
extern d_ioctl_t	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 d_open_t		logopen;
extern d_close_t	logclose;
extern d_read_t		logread;
extern d_ioctl_t	logioctl;
extern d_select_t	logselect;
extern d_open_t		fdesc_open;
extern d_read_t		fdesc_read;
extern d_write_t	fdesc_write;
extern d_ioctl_t	fdesc_ioctl;
extern d_select_t	fdesc_select;

#define nullopen	(d_open_t *)&nulldev
#define nullclose	(d_close_t *)&nulldev
#define nullread	(d_read_t *)&nulldev
#define nullwrite	(d_write_t *)&nulldev
#define nullioctl	(d_ioctl_t *)&nulldev
#define nullselect	(d_select_t *)&nulldev
#define nullstop	(d_stop_t *)&nulldev
#define nullreset	(d_reset_t *)&nulldev

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,	nullstop,	nullreset,	0,		cnselect,
	eno_mmap,	eno_strat,	cngetc,		cnputc, 	D_TTY
    },
    NO_CDEVICE,								/* 1*/
    {
	cttyopen,	nullclose,	cttyread,	cttywrite,	/* 2*/
	cttyioctl,	nullstop,	nullreset,	0,		cttyselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	nullopen,	nullclose,	mmread,		mmwrite,	/* 3*/
	mmioctl,	nullstop,	nullreset,	0,		mmselect,
	mmmmap,		eno_strat,	eno_getc,	eno_putc,	D_DISK
    },
    {
	ptsopen,	ptsclose,	ptsread,	ptswrite,	/* 4*/
	ptyioctl,	ptsstop,	nullreset,	pt_tty,		ttselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	ptcopen,	ptcclose,	ptcread,	ptcwrite,	/* 5*/
	ptyioctl,	nullstop,	nullreset,	0,		ptcselect,
	eno_mmap,	eno_strat,	eno_getc,	eno_putc,	D_TTY
    },
    {
	logopen,	logclose,	logread,	eno_rdwrt,	/* 6*/
	logioctl,	eno_stop,	nullreset,	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,	nullstop,	nullreset,	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,		(select_fcn_t *)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_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_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_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	*
37839358 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	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 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,
37839358 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>
1c79356b A	38	#include <sys/ioctl.h>
	39	#include <sys/tty.h>
	40	#include <sys/conf.h>
	41
91447636 A	42	/* Prototypes that should be elsewhere: */
	43	extern int isdisk(dev_t dev, int type);
	44	extern dev_t chrtoblk(dev_t dev);
	45	extern int chrtoblk_set(int cdev, int bdev);
	46	extern int iskmemdev(dev_t dev);
1c79356b A	47
	48	struct bdevsw bdevsw[] =
	49	{
	50	/*
	51	* For block devices, every other block of 8 slots is
	52	* reserved to NeXT. The other slots are available for
	53	* the user. This way we can both add new entries without
	54	* running into each other. Be sure to fill in NeXT's
	55	* 8 reserved slots when you jump over us -- we'll do the
	56	* same for you.
	57	*/
	58
	59	/* 0 - 7 are reserved to NeXT */
	60
	61	NO_BDEVICE, /* 0*/
	62	NO_BDEVICE, /* 1*/
	63	NO_BDEVICE, /* 2*/
	64	NO_BDEVICE, /* 3*/
	65	NO_BDEVICE, /* 4*/
	66	NO_BDEVICE, /* 5*/
	67	NO_BDEVICE, /* 6*/
	68	NO_BDEVICE, /* 7*/
	69
	70	/* 8 - 15 are reserved to the user */
	71	NO_BDEVICE, /* 8*/
	72	NO_BDEVICE, /* 9*/
	73	NO_BDEVICE, /10/
	74	NO_BDEVICE, /11/
	75	NO_BDEVICE, /12/
	76	NO_BDEVICE, /13/
	77	NO_BDEVICE, /14/
	78	NO_BDEVICE, /15/
	79
	80	/* 16 - 23 are reserved to NeXT */
	81	NO_BDEVICE, /16/
	82	NO_BDEVICE, /17/
	83	NO_BDEVICE, /18/
	84	NO_BDEVICE, /18/
	85	NO_BDEVICE, /20/
	86	NO_BDEVICE, /21/
	87	NO_BDEVICE, /22/
	88	NO_BDEVICE, /23/
	89	};
	90
	91	int nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
	92
	93	extern struct tty *km_tty[];
91447636 A	94	extern d_open_t cnopen;
	95	extern d_close_t cnclose;
	96	extern d_read_t cnread;
	97	extern d_write_t cnwrite;
	98	extern d_ioctl_t cnioctl;
	99	extern d_select_t cnselect;
	100	extern d_getc_t cngetc;
	101	extern d_putc_t cnputc;
	102	extern d_open_t kmopen;
	103	extern d_close_t kmclose;
	104	extern d_read_t kmread;
	105	extern d_write_t kmwrite;
	106	extern d_ioctl_t kmioctl;
	107	extern d_getc_t kmgetc;
	108	extern d_putc_t kmputc;
	109	extern d_open_t sgopen;
	110	extern d_close_t sgclose;
	111	extern d_ioctl_t sgioctl;
1c79356b A	112
1c79356b A	113	#if NVOL > 0
91447636 A	114	extern d_open_t volopen;
	115	extern d_close_t volclose;
	116	extern d_ioctl_t volioctl;
1c79356b A	117	#else
	118	#define volopen eno_opcl
	119	#define volclose eno_opcl
	120	#define volioctl eno_ioctl
	121	#endif
	122
91447636 A	123	extern d_open_t cttyopen;
	124	extern d_read_t cttyread;
	125	extern d_write_t cttywrite;
	126	extern d_ioctl_t cttyioctl;
	127	extern d_select_t cttyselect;
1c79356b	128
91447636 A	129	extern d_read_t mmread;
	130	extern d_write_t mmwrite;
	131	extern d_ioctl_t mmioctl;
55e303ae	132	#define mmselect (select_fcn_t *)seltrue
1c79356b A	133	#define mmmmap eno_mmap
	134
	135	#include <pty.h>
	136	#if NPTY > 0
	137	extern struct tty *pt_tty[];
91447636 A	138	extern d_open_t ptsopen;
	139	extern d_close_t ptsclose;
	140	extern d_read_t ptsread;
	141	extern d_write_t ptswrite;
	142	extern d_stop_t ptsstop;
	143	extern d_putc_t ptsputc;
	144	extern d_open_t ptcopen;
	145	extern d_close_t ptcclose;
	146	extern d_read_t ptcread;
	147	extern d_write_t ptcwrite;
	148	extern d_select_t ptcselect;
	149	extern d_ioctl_t ptyioctl;
1c79356b A	150	#else
	151	#define ptsopen eno_opcl
	152	#define ptsclose eno_opcl
	153	#define ptsread eno_rdwrt
	154	#define ptswrite eno_rdwrt
	155	#define ptsstop nulldev
	156	#define ptsputc nulldev
	157
	158	#define ptcopen eno_opcl
	159	#define ptcclose eno_opcl
	160	#define ptcread eno_rdwrt
	161	#define ptcwrite eno_rdwrt
	162	#define ptcselect eno_select
	163	#define ptyioctl eno_ioctl
	164	#endif
	165
91447636 A	166	extern d_open_t logopen;
	167	extern d_close_t logclose;
	168	extern d_read_t logread;
	169	extern d_ioctl_t logioctl;
	170	extern d_select_t logselect;
	171	extern d_open_t fdesc_open;
	172	extern d_read_t fdesc_read;
	173	extern d_write_t fdesc_write;
	174	extern d_ioctl_t fdesc_ioctl;
	175	extern d_select_t fdesc_select;
	176
	177	#define nullopen (d_open_t *)&nulldev
	178	#define nullclose (d_close_t *)&nulldev
	179	#define nullread (d_read_t *)&nulldev
	180	#define nullwrite (d_write_t *)&nulldev
	181	#define nullioctl (d_ioctl_t *)&nulldev
	182	#define nullselect (d_select_t *)&nulldev
	183	#define nullstop (d_stop_t *)&nulldev
	184	#define nullreset (d_reset_t *)&nulldev
1c79356b	185
1c79356b A	186	struct cdevsw cdevsw[] =
	187	{
	188	/*
	189	* For character devices, every other block of 16 slots is
	190	* reserved to NeXT. The other slots are available for
	191	* the user. This way we can both add new entries without
	192	* running into each other. Be sure to fill in NeXT's
	193	* 16 reserved slots when you jump over us -- we'll do the
	194	* same for you.
	195	*/
	196
	197	/* 0 - 15 are reserved to NeXT */
	198
	199	{
	200	cnopen, cnclose, cnread, cnwrite, /* 0*/
91447636	201	cnioctl, nullstop, nullreset, 0, cnselect,
1c79356b A	202	eno_mmap, eno_strat, cngetc, cnputc, D_TTY
	203	},
	204	NO_CDEVICE, /* 1*/
	205	{
91447636 A	206	cttyopen, nullclose, cttyread, cttywrite, /* 2*/
91447636 A	207	cttyioctl, nullstop, nullreset, 0, cttyselect,
1c79356b A	208	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	209	},
	210	{
91447636 A	211	nullopen, nullclose, mmread, mmwrite, /* 3*/
	212	mmioctl, nullstop, nullreset, 0, mmselect,
	213	mmmmap, eno_strat, eno_getc, eno_putc, D_DISK
1c79356b A	214	},
	215	{
	216	ptsopen, ptsclose, ptsread, ptswrite, /* 4*/
91447636	217	ptyioctl, ptsstop, nullreset, pt_tty, ttselect,
1c79356b A	218	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	219	},
	220	{
	221	ptcopen, ptcclose, ptcread, ptcwrite, /* 5*/
91447636	222	ptyioctl, nullstop, nullreset, 0, ptcselect,
1c79356b A	223	eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	224	},
	225	{
	226	logopen, logclose, logread, eno_rdwrt, /* 6*/
91447636	227	logioctl, eno_stop, nullreset, 0, logselect,
1c79356b A	228	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	229	},
	230	NO_CDEVICE, /* 7*/
	231	NO_CDEVICE, /* 8*/
	232	NO_CDEVICE, /* 9*/
	233	NO_CDEVICE, /10/
	234	NO_CDEVICE, /11/
	235	{
	236	kmopen, kmclose, kmread, kmwrite, /12/
91447636	237	kmioctl, nullstop, nullreset, km_tty, ttselect,
1c79356b A	238	eno_mmap, eno_strat, kmgetc, kmputc, 0
	239	},
	240	NO_CDEVICE, /13/
	241	NO_CDEVICE, /14/
	242	NO_CDEVICE, /15/
	243
	244	/* 16 - 31 are reserved to the user */
	245	NO_CDEVICE, /16/
	246	NO_CDEVICE, /17/
	247	NO_CDEVICE, /18/
	248	NO_CDEVICE, /19/
	249	NO_CDEVICE, /20/
	250	NO_CDEVICE, /21/
	251	NO_CDEVICE, /22/
	252	NO_CDEVICE, /23/
	253	NO_CDEVICE, /24/
	254	NO_CDEVICE, /25/
	255	NO_CDEVICE, /26/
	256	NO_CDEVICE, /27/
	257	NO_CDEVICE, /28/
	258	NO_CDEVICE, /29/
	259	NO_CDEVICE, /30/
	260	NO_CDEVICE, /31/
	261
	262	/* 32 - 47 are reserved to NeXT */
	263	{
	264	fdesc_open, eno_opcl, fdesc_read, fdesc_write, /32/
	265	fdesc_ioctl, eno_stop, eno_reset, 0, fdesc_select,
	266	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	267	},
	268	#if 1
	269	NO_CDEVICE,
	270	#else
	271	{
	272	sgopen, sgclose, eno_rdwrt, eno_rdwrt, /33/
	273	sgioctl, eno_stop, eno_reset, 0, eno_select,
	274	eno_mmap, eno_strat, eno_getc, eno_putc, D_TAPE
	275	},
	276	#endif
	277	NO_CDEVICE, /34/
	278	NO_CDEVICE, /35/
	279	NO_CDEVICE, /36/
	280	NO_CDEVICE, /37/
	281	NO_CDEVICE, /38/
	282	NO_CDEVICE, /39/
	283	NO_CDEVICE, /40/
	284	NO_CDEVICE, /41/
	285	{
	286	volopen, volclose, eno_rdwrt, eno_rdwrt, /42/
55e303ae	287	volioctl, eno_stop, eno_reset, 0, (select_fcn_t *)seltrue,
1c79356b A	288	eno_mmap, eno_strat, eno_getc, eno_putc, 0
	289	},
	290	};
	291	int nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
	292
	293
	294	#include <sys/vnode.h> /* for VCHR and VBLK */
	295	/*
	296	* return true if a disk
	297	*/
	298	int
91447636	299	isdisk(dev_t dev, int type)
1c79356b	300	{
9bccf70c A	301	dev_t maj = major(dev);
	302
	303	switch (type) {
	304	case VCHR:
	305	maj = chrtoblk(maj);
	306	if (maj == NODEV) {
	307	break;
	308	}
	309	/* FALL THROUGH */
	310	case VBLK:
	311	if (bdevsw[maj].d_type == D_DISK) {
	312	return (1);
	313	}
1c79356b A	314	break;
	315	}
	316	return(0);
	317	}
	318
	319	static int chrtoblktab[] = {
	320	/* CHR/ / BLK/ / CHR/ / BLK*/
	321	/* 0 / NODEV, / 1 */ NODEV,
	322	/* 2 / NODEV, / 3 */ NODEV,
	323	/* 4 / NODEV, / 5 */ NODEV,
	324	/* 6 / NODEV, / 7 */ NODEV,
	325	/* 8 / NODEV, / 9 */ NODEV,
	326	/* 10 / NODEV, / 11 */ NODEV,
	327	/* 12 / NODEV, / 13 */ NODEV,
	328	/* 14 / 6, / 15 */ NODEV,
	329	/* 16 / NODEV, / 17 */ NODEV,
	330	/* 18 / NODEV, / 19 */ NODEV,
	331	/* 20 / NODEV, / 21 */ NODEV,
	332	/* 22 / NODEV, / 23 */ NODEV,
	333	/* 24 / NODEV, / 25 */ NODEV,
	334	/* 26 / NODEV, / 27 */ NODEV,
	335	/* 28 / NODEV, / 29 */ NODEV,
	336	/* 30 / NODEV, / 31 */ NODEV,
	337	/* 32 / NODEV, / 33 */ NODEV,
	338	/* 34 / NODEV, / 35 */ NODEV,
	339	/* 36 / NODEV, / 37 */ NODEV,
	340	/* 38 / NODEV, / 39 */ NODEV,
	341	/* 40 / NODEV, / 41 */ 1,
	342	/* 42 / NODEV, / 43 */ NODEV,
	343	/* 44 */ NODEV,
	344	};
	345
	346	/*
	347	* convert chr dev to blk dev
	348	*/
	349	dev_t
91447636	350	chrtoblk(dev_t dev)
1c79356b A	351	{
	352	int blkmaj;
	353
	354	if (major(dev) >= nchrdev)
	355	return(NODEV);
	356	blkmaj = chrtoblktab[major(dev)];
	357	if (blkmaj == NODEV)
	358	return(NODEV);
	359	return(makedev(blkmaj, minor(dev)));
	360	}
	361
9bccf70c A	362	int
	363	chrtoblk_set(int cdev, int bdev)
	364	{
	365	if (cdev >= nchrdev)
	366	return (-1);
	367	if (bdev != NODEV && bdev >= nblkdev)
	368	return (-1);
	369	chrtoblktab[cdev] = bdev;
	370	return 0;
	371	}
	372
1c79356b A	373	/*
	374	* Returns true if dev is /dev/mem or /dev/kmem.
	375	*/
91447636	376	int iskmemdev(dev_t dev)
1c79356b	377	{
1c79356b A	378	return (major(dev) == 3 && minor(dev) < 2);
1c79356b A	379	}