1/*	$OpenBSD: cninit.c,v 1.15 2017/12/30 20:46:59 guenther Exp $	*/
2/*	$NetBSD: cninit.c,v 1.2 1995/04/11 22:08:10 pk Exp $	*/
3
4/*
5 * Copyright (c) 1988 University of Utah.
6 * Copyright (c) 1990, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: Utah $Hdr: cons.c 1.7 92/01/21$
38 *
39 *	@(#)cons.c	8.2 (Berkeley) 1/12/94
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/ioctl.h>
45#include <sys/tty.h>
46#include <sys/conf.h>
47#include <sys/vnode.h>
48
49#include <dev/cons.h>
50
51struct consdev *cn_tab = NULL;
52
53void
54cninit(void)
55{
56	struct consdev *cp;
57
58	/*
59	 * Collect information about all possible consoles
60	 * and find the one with highest priority.
61	 */
62	for (cp = constab; cp->cn_probe; cp++) {
63		(*cp->cn_probe)(cp);
64		if (cp->cn_pri != CN_DEAD &&
65		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
66			cn_tab = cp;
67	}
68
69	/*
70	 * No console, we can handle it.
71	 */
72	if ((cp = cn_tab) == NULL)
73		return;
74
75	/*
76	 * Turn on console.
77	 */
78	(*cp->cn_init)(cp);
79}
80