1/*	$OpenBSD: cons.c,v 1.14 2010/05/09 15:30:28 jsg Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * form: OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48
37 * from: OpenBSD: cninit.c,v 1.2 1996/03/30 02:03:45
38 * from: Utah $Hdr: cons.c 1.7 92/01/21$
39 *
40 *	@(#)cons.c	8.2 (Berkeley) 1/12/94
41 */
42
43#include <sys/param.h>
44#include "stand.h"
45#include <dev/cons.h>
46
47extern struct consdev constab[];
48
49void
50cninit(void)
51{
52	struct consdev *cp;
53
54	/*
55	 * Collect information about all possible consoles
56	 * and find the one with highest priority
57	 */
58	for (cp = constab; cp->cn_probe; cp++) {
59		(*cp->cn_probe)(cp);
60		if (cp->cn_pri != CN_DEAD &&
61		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
62			cn_tab = cp;
63	}
64	/*
65	 * No console, we can handle it
66	 */
67	if ((cp = cn_tab) == NULL)
68		return;
69	/*
70	 * Turn on console
71	 */
72	(*cp->cn_init)(cp);
73}
74
75int
76cnset(dev_t dev)
77{
78	struct consdev *cp;
79
80	/*
81	 * Look for the specified console device and use it.
82	 */
83	for (cp = constab; cp->cn_probe; cp++) {
84		if (major(cp->cn_dev) == major(dev)) {
85			/* short-circuit noop */
86			if (cp == cn_tab && cp->cn_dev == dev)
87				return (0);
88			if (cp->cn_pri != CN_DEAD) {
89				cn_tab = cp;
90				cp->cn_dev = dev;
91				/* Turn it on.  */
92				(*cp->cn_init)(cp);
93				return (0);
94			}
95			break;
96		}
97	}
98	return (1);
99}
100
101int
102cngetc(void)
103{
104	if (cn_tab == NULL)
105		return (0);
106	return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
107}
108
109void
110cnputc(int c)
111{
112	if (cn_tab != NULL && c) {
113		(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
114		if (c == '\n')
115			(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
116	}
117}
118
119int
120cnischar(void)
121{
122	if (cn_tab != NULL)
123		return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80));
124	return 0;
125}
126