cons.h

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/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)cons.h	7.2 (Berkeley) 5/9/91
 *	$Id: cons.h,v 1.19 1999/01/09 14:07:37 bde Exp $
 */

#ifndef _MACHINE_CONS_H_
#define	_MACHINE_CONS_H_

struct consdev;
typedef	void	cn_probe_t __P((struct consdev *));
typedef	void	cn_init_t __P((struct consdev *));
typedef	int	cn_getc_t __P((dev_t));
typedef	int	cn_checkc_t __P((dev_t));
typedef	void	cn_putc_t __P((dev_t, int));

struct consdev {
	cn_probe_t	*cn_probe;
				/* probe hardware and fill in consdev info */
	cn_init_t	*cn_init;
				/* turn on as console */
	cn_getc_t	*cn_getc;
				/* kernel getchar interface */
	cn_checkc_t	*cn_checkc;
				/* kernel "return char if available" interface */
	cn_putc_t	*cn_putc;
				/* kernel putchar interface */
	struct	tty *cn_tp;	/* tty structure for console device */
	dev_t	cn_dev;		/* major/minor of device */
	short	cn_pri;		/* pecking order; the higher the better */
};

/* values for cn_pri - reflect our policy for console selection */
#define	CN_DEAD		0	/* device doesn't exist */
#define CN_NORMAL	1	/* device exists but is nothing special */
#define CN_INTERNAL	2	/* "internal" bit-mapped display */
#define CN_REMOTE	3	/* serial interface with remote bit set */

#ifdef KERNEL
extern	struct linker_set cons_set;
extern	int cons_unavail;

#define CONS_DRIVER(name, probe, init, getc, checkc, putc)	\
	static struct consdev name##_consdev = {		\
		probe, init, getc, checkc, putc			\
	};							\
	DATA_SET(cons_set, name##_consdev)

/* Other kernel entry points. */
int	cncheckc __P((void));
int	cngetc __P((void));
void	cninit __P((void));
void	cninit_finish __P((void));
void	cnputc __P((int));

#endif /* KERNEL */

#endif /* !_MACHINE_CONS_H_ */