FreeBSD/Linux Kernel Cross Reference
sys/dev/cninit.c
1 /* $NetBSD: cninit.c,v 1.9 2008/03/11 05:31:00 matt Exp $ */
2
3 /*
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * from: Utah $Hdr: cons.c 1.7 92/01/21$
36 *
37 * @(#)cons.c 8.2 (Berkeley) 1/12/94
38 */
39
40 /*
41 * Copyright (c) 1988 University of Utah.
42 *
43 * This code is derived from software contributed to Berkeley by
44 * the Systems Programming Group of the University of Utah Computer
45 * Science Department.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. All advertising materials mentioning features or use of this software
56 * must display the following acknowledgement:
57 * This product includes software developed by the University of
58 * California, Berkeley and its contributors.
59 * 4. Neither the name of the University nor the names of its contributors
60 * may be used to endorse or promote products derived from this software
61 * without specific prior written permission.
62 *
63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
73 * SUCH DAMAGE.
74 *
75 * from: Utah $Hdr: cons.c 1.7 92/01/21$
76 *
77 * @(#)cons.c 8.2 (Berkeley) 1/12/94
78 */
79
80 #include <sys/cdefs.h>
81 __KERNEL_RCSID(0, "$NetBSD: cninit.c,v 1.9 2008/03/11 05:31:00 matt Exp $");
82
83 #include <sys/param.h>
84 #include <sys/proc.h>
85 #include <sys/user.h>
86 #include <sys/systm.h>
87 #include <sys/buf.h>
88 #include <sys/ioctl.h>
89 #include <sys/tty.h>
90 #include <sys/file.h>
91 #include <sys/conf.h>
92 #include <sys/vnode.h>
93
94 #include <dev/cons.h>
95
96 void
97 cninit(void)
98 {
99 struct consdev *cp;
100 struct consdev *bestMatch;
101
102 bestMatch = cn_tab = NULL;
103 /*
104 * Collect information about all possible consoles
105 * and find the one with highest priority
106 */
107 for (cp = constab; cp->cn_probe; cp++) {
108 (*cp->cn_probe)(cp);
109 if (cp->cn_pri > CN_DEAD &&
110 (bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
111 bestMatch = cp;
112 }
113 }
114 /*
115 * No console, we can handle it
116 */
117 if ((cp = bestMatch) == NULL)
118 return;
119 /*
120 * Turn on console
121 */
122 {
123 struct consdev *old_cn_tab = cn_tab;
124
125 (*cp->cn_init)(cp);
126 /*
127 * Now let everyone know we have an active console they can
128 * use for diagnostics. If we use cn_tab in the search loop
129 * then interrupts from the ethernet at boot may cause system
130 * hang.
131 */
132 if (cn_tab == old_cn_tab)
133 cn_tab = bestMatch;
134 }
135 }
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