conf.c   [plain text]

/*
 * Copyright (c) 1997-2017 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) 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 dev_t	chrtoblk(dev_t dev);
extern int	chrtoblk_set(int cdev, int bdev);

struct bdevsw	bdevsw[] =
{
	/*
	 *	For block devices, every other block of 8 slots is 
	 *	reserved for Apple.  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 Apple's
	 *	8 reserved slots when you jump over us -- we'll do the
	 *	same for you.
	 */

	/* 0 - 7 are reserved for Apple */

	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 for Apple */
	NO_BDEVICE,							/*16*/
	NO_BDEVICE,							/*17*/
	NO_BDEVICE,							/*18*/
	NO_BDEVICE,							/*18*/
	NO_BDEVICE,							/*20*/
	NO_BDEVICE,							/*21*/
	NO_BDEVICE,							/*22*/
	NO_BDEVICE,							/*23*/
};

const 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_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_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 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_select_t	ptsselect;
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 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 	oslog_streamopen;
extern d_close_t	oslog_streamclose;
extern d_read_t 	oslog_streamread;
extern d_ioctl_t	oslog_streamioctl;
extern d_select_t	oslog_streamselect;

extern d_open_t 	oslogopen;
extern d_close_t	oslogclose;
extern d_select_t	oslogselect;
extern d_ioctl_t	oslogioctl;

#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[] = {
	/*
	 * To add character devices to this table dynamically, use cdevsw_add.
	 */

	[0] = {
		cnopen, cnclose, cnread, cnwrite,
		cnioctl, nullstop, nullreset, 0, cnselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	},
	[1] = NO_CDEVICE,
	[2] = {
		cttyopen, nullclose, cttyread, cttywrite,
		cttyioctl, nullstop, nullreset, 0, cttyselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	},
	[3] = {
		nullopen, nullclose, mmread, mmwrite,
		mmioctl, nullstop, nullreset, 0, mmselect,
		mmmmap, eno_strat, eno_getc, eno_putc, D_DISK
	},
	[PTC_MAJOR] = {
		ptsopen, ptsclose, ptsread, ptswrite,
		ptyioctl, ptsstop, nullreset, 0, ptsselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	},
	[PTS_MAJOR] = {
		ptcopen, ptcclose, ptcread, ptcwrite,
		ptyioctl, nullstop, nullreset, 0, ptcselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
	},
	[6] = {
		logopen, logclose, logread, eno_rdwrt,
		logioctl, eno_stop, nullreset, 0, logselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, 0
	},
	[7] = {
		oslogopen, oslogclose, eno_rdwrt, eno_rdwrt,
		oslogioctl, eno_stop, nullreset, 0, oslogselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, 0
	},
	[8] = {
		oslog_streamopen, oslog_streamclose, oslog_streamread, eno_rdwrt,
		oslog_streamioctl, eno_stop, nullreset, 0, oslog_streamselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, 0
	},
	[9 ... 11] = NO_CDEVICE,
	[12] = {
		kmopen, kmclose, kmread, kmwrite,
		kmioctl, nullstop, nullreset, km_tty, ttselect,
		eno_mmap, eno_strat, eno_getc, eno_putc, 0
	},
	[13 ... 41] = NO_CDEVICE,
	[42] = {
		volopen, volclose, eno_rdwrt, eno_rdwrt,
		volioctl, eno_stop, eno_reset, 0, (select_fcn_t *) seltrue,
		eno_mmap, eno_strat, eno_getc, eno_putc, 0
	}
};
const int nchrdev = sizeof(cdevsw) / sizeof(cdevsw[0]);

uint64_t cdevsw_flags[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 */	NODEV,		/* 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 */	NODEV,
	/* 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;
}