1 /* $OpenBSD: cninit.c,v 1.6 2003/06/02 23:28:01 millert 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/proc.h>
45 #include <sys/user.h>
46 #include <sys/buf.h>
47 #include <sys/ioctl.h>
48 #include <sys/tty.h>
49 #include <sys/file.h>
50 #include <sys/conf.h>
51 #include <sys/vnode.h>
52
53 #include <dev/cons.h>
54
55 void
56 cninit()
57 {
58 struct consdev *cp;
59
60 /*
61 * Collect information about all possible consoles
62 * and find the one with highest priority
63 */
64 for (cp = constab; cp->cn_probe; cp++) {
65 (*cp->cn_probe)(cp);
66 if (cp->cn_pri > CN_DEAD &&
67 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
68 cn_tab = cp;
69 }
70 /*
71 * No console, we can handle it
72 */
73 if ((cp = cn_tab) == NULL)
74 return;
75 /*
76 * Turn on console
77 */
78 (*cp->cn_init)(cp);
79 }
80
81 int
82 cnset(dev)
83 dev_t dev;
84 {
85 struct consdev *cp;
86
87 /*
88 * Look for the specified console device and use it.
89 */
90 for (cp = constab; cp->cn_probe; cp++) {
91 if (major(cp->cn_dev) == major(dev)) {
92 /* short-circuit noop */
93 if (cp == cn_tab && cp->cn_dev == dev)
94 return (0);
95 if (cp->cn_pri > CN_DEAD) {
96 cn_tab = cp;
97 cp->cn_dev = dev;
98 /* Turn it on. */
99 (cp->cn_init)(cp);
100 return (0);
101 }
102 break;
103 }
104 }
105 return (1);
106 }