conf.c

早期freebsd实现

	seltrue, (dev_type_map((*))) enodev, \
	0 }

#include "ms.h"
#define msmap msmmap
cdev_decl(ms);
/* open, close, read, write, ioctl, select */
#define	cdev_ms_init(c,n) { \
	dev_init(c,n,open), dev_init(c,n,close), dev_init(c,n,read), \
	dev_init(c,n,write), dev_init(c,n,ioctl), (dev_type_stop((*))) enodev, \
	(dev_type_reset((*))) nullop, 0, seltrue, (dev_type_map((*))) enodev, \
	0 }

#include "fb.h"
cdev_decl(fb);
/* open, close, ioctl, mmap */
#define	cdev_fb_init(c,n) { \
	dev_init(c,n,open), dev_init(c,n,close), (dev_type_read((*))) enodev, \
	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
	(dev_type_stop((*))) enodev, \
	(dev_type_reset((*))) nullop, 0, seltrue, (dev_type_map((*))) enodev, 0 }
/*
	(dev_type_reset((*))) nullop, 0, seltrue, dev_init(c,n,map), 0 }
*/

#include "st.h"
cdev_decl(st);

#include "lb.h"
cdev_decl(lbp);

#include "ir.h"
cdev_decl(ir);
/* open, close, read, ioctl */
#define	cdev_ir_init(c,n) { \
	dev_init(c,n,open), dev_init(c,n,close), dev_init(c,n,read), \
	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
	(dev_type_stop((*))) enodev, (dev_type_reset((*))) nullop, 0, \
	seltrue, (dev_type_map((*))) enodev, 0 }

cdev_decl(log);
/* open, close, read, ioctl, select -- XXX should be a generic device */
#define	cdev_log_init(c,n) { \
	dev_init(c,n,open), dev_init(c,n,close), dev_init(c,n,read), \
	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
	(dev_type_stop((*))) enodev, (dev_type_reset((*))) nullop, 0, \
	dev_init(c,n,select), (dev_type_map((*))) enodev, 0 }

dev_type_open(fdopen);
/* open */
#define	cdev_fd_init(c,n) { \
	dev_init(c,n,open), (dev_type_close((*))) enodev, \
	(dev_type_read((*))) enodev, (dev_type_write((*))) enodev, \
	(dev_type_ioctl((*))) enodev, (dev_type_stop((*))) enodev, \
	(dev_type_reset((*))) enodev, 0, (dev_type_select((*))) enodev, \
	(dev_type_map((*))) enodev, 0 }

cdev_decl(vn);
/* open, read, write, ioctl -- XXX should be a disk */
#define	cdev_vn_init(c,n) { \
	dev_init(c,n,open), (dev_type_close((*))) nullop, dev_init(c,n,read), \
	dev_init(c,n,write), dev_init(c,n,ioctl), (dev_type_stop((*))) enodev, \
	(dev_type_reset((*))) nullop, 0, seltrue, (dev_type_map((*))) enodev, \
	0 }

#include "bpfilter.h"
cdev_decl(bpf);
/* open, close, read, write, ioctl, select -- XXX should be generic device */
#define	cdev_bpf_init(c,n) { \
	dev_init(c,n,open), dev_init(c,n,close), dev_init(c,n,read), \
	dev_init(c,n,write), dev_init(c,n,ioctl), (dev_type_stop((*))) enodev, \
	(dev_type_reset((*))) enodev, 0, dev_init(c,n,select), \
	(dev_type_map((*))) enodev, 0 }

struct cdevsw	cdevsw[] =
{
	cdev_vc_init(1,vc),		/* 0: virtual console */
	cdev_tty_init(NRS,rs),		/* 1: rs232c */
	cdev_ctty_init(1,ctty),		/* 2: controlling terminal */
	cdev_mm_init(1,mm),		/* 3: /dev/{null,mem,kmem,...} */
	cdev_disk_init(NSD,sd_c_),	/* 4: scsi disk */
	cdev_disk_init(NFD,fd_c_),     	/* 5: floppy disk */
	cdev_disk_init(NLP,lp),		/* 6: printer */
	cdev_swap_init(1,sw),		/* 7: /dev/drum (swap pseudo-device) */
	cdev_tty_init(NPTY,pts),	/* 8: pseudo-tty slave */
	cdev_ptc_init(NPTY,ptc),	/* 9: pseudo-tty master */
	cdev_notdef(),			/* 10: md (sony memory disk) */
	cdev_kb_init(NKB,kb),		/* 11: keyboard */
	cdev_ms_init(NMS,ms),		/* 12: mouse */
	cdev_fd_init(1,fd),		/* 13: file descriptor pseudo-dev */
	cdev_fb_init(NFB,fb),		/* 14: frame buffer */
	cdev_vn_init(NVN,vn),		/* 15: vnode disk */
	cdev_tape_init(NST,st),		/* 16: scsi tape */
	cdev_kb_init(NLB,lbp),		/* 17: lbp */
	cdev_ir_init(NIR,ir),		/* 18: image reader */
	cdev_notdef(),			/* 19: vme */
	cdev_notdef(),			/* 20: gpib */
	cdev_notdef(),			/* 21: rd */
	cdev_tty_init(NBM,cn),		/* 22: console display device */
	cdev_notdef(),			/* 23: ether */
	cdev_bpf_init(NBPFILTER,bpf),	/* 24: berkeley packet filter */
	cdev_notdef(),			/* 25 */
	cdev_notdef(),			/* 26 */
	cdev_notdef(),			/* 27 */
	cdev_notdef(),			/* 28: scsi */
	cdev_notdef(),			/* 29: sony shm */
	cdev_notdef(),			/* 30: sony semaphoe? */
	cdev_notdef(),			/* 31: vvcrs */
	cdev_notdef(),			/* 32: fddi */
	cdev_log_init(1,log),		/* 33: /dev/klog */
	cdev_notdef(),			/* 34: image board */
	cdev_notdef(),			/* 35: sb? */
	cdev_notdef(),			/* 36: sbe? */
	cdev_notdef(),			/* 37: vd (safs) */
	cdev_notdef(),			/* 38: xd (safs) */
	cdev_notdef(),			/* 39: isdn */
	cdev_notdef(),			/* 40: rb */
	cdev_notdef(),			/* 41: gs */
	cdev_notdef(),			/* 42: rx */
};

int	nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);

int	mem_no = 2; 	/* major device number of memory special file */

/*
 * Swapdev is a fake device implemented
 * in sw.c used only internally to get to swstrategy.
 * It cannot be provided to the users, because the
 * swstrategy routine munches the b_dev and b_blkno entries
 * before calling the appropriate driver.  This would horribly
 * confuse, e.g. the hashing routines. Instead, /dev/drum is
 * provided as a character (raw) device.
 */
dev_t	swapdev = makedev(1, 0);

/*
 * Routine that identifies /dev/mem and /dev/kmem.
 *
 * A minimal stub routine can always return 0.
 */
iskmemdev(dev)
	dev_t dev;
{

	if (major(dev) == 3 && (minor(dev) == 0 || minor(dev) == 1))
		return (1);
	return (0);
}

iszerodev(dev)
	dev_t dev;
{
	return (major(dev) == 3 && minor(dev) == 12);
}

/*
 * Routine to determine if a device is a disk.
 *
 * A minimal stub routine can always return 0.
 */
isdisk(dev, type)
	dev_t dev;
	int type;
{

	switch (major(dev)) {
	case 0:
	case 3:
		if (type == VBLK)
			return (1);
		return (0);
	case 4:
	case 15:
		if (type == VCHR)
			return (1);
		/* FALLTHROUGH */
	default:
		return (0);
	}
	/* NOTREACHED */
}

#define MAXDEV	43
static int chrtoblktbl[MAXDEV] =  {
      /* VCHR */      /* VBLK */
	/* 0 */		NODEV,
	/* 1 */		NODEV,
	/* 2 */		NODEV,
	/* 3 */		NODEV,
	/* 4 */		0,
	/* 5 */		NODEV,
	/* 6 */		NODEV,
	/* 7 */		NODEV,
	/* 8 */		NODEV,
	/* 9 */		NODEV,
	/* 10 */	NODEV,
	/* 11 */	NODEV,
	/* 12 */	NODEV,
	/* 13 */	NODEV,
	/* 14 */	NODEV,
	/* 15 */	3,
	/* 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,
};
/*
 * Routine to convert from character to block device number.
 *
 * A minimal stub routine can always return NODEV.
 */
chrtoblk(dev)
	dev_t dev;
{
	int blkmaj;

	if (major(dev) >= MAXDEV || (blkmaj = chrtoblktbl[major(dev)]) == NODEV)
		return (NODEV);
	return (makedev(blkmaj, minor(dev)));
}