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
47 extern struct consdev constab[];
48
49 void
cninit(void)50 cninit(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
75 int
cnset(dev_t dev)76 cnset(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
101 int
cngetc(void)102 cngetc(void)
103 {
104 if (cn_tab == NULL)
105 return (0);
106 return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
107 }
108
109 void
cnputc(int c)110 cnputc(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
119 int
cnischar(void)120 cnischar(void)
121 {
122 if (cn_tab != NULL)
123 return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80));
124 return 0;
125 }
126