1 /* $NetBSD: console.c,v 1.3 2009/07/20 04:59:03 kiyohara Exp $ */
2
3 /*-
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 /* __FBSDID("$FreeBSD: src/sys/boot/common/console.c,v 1.6 2003/08/25 23:30:41 obrien Exp $"); */
31
32 #include <lib/libsa/stand.h>
33 #include <lib/libsa/loadfile.h>
34 #include <lib/libkern/libkern.h>
35
36 #include "bootstrap.h"
37 /*
38 * Core console support
39 */
40
41 static int cons_set(struct env_var *ev, int flags, void *value);
42 static int cons_find(char *name);
43
44 /*
45 * Detect possible console(s) to use. The first probed console
46 * is marked active. Also create the console variable.
47 *
48 * XXX Add logic for multiple console support.
49 */
50 void
cons_probe(void)51 cons_probe(void)
52 {
53 int cons;
54 int active;
55 char *prefconsole;
56
57 /* Do all console probes */
58 for (cons = 0; consoles[cons] != NULL; cons++) {
59 consoles[cons]->c_flags = 0;
60 consoles[cons]->c_probe(consoles[cons]);
61 }
62 /* Now find the first working one */
63 active = -1;
64 for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
65 consoles[cons]->c_flags = 0;
66 consoles[cons]->c_probe(consoles[cons]);
67 if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
68 active = cons;
69 }
70
71 /* Check to see if a console preference has already been registered */
72 prefconsole = getenv("console");
73 if (prefconsole != NULL)
74 prefconsole = strdup(prefconsole);
75 if (prefconsole != NULL) {
76 unsetenv("console"); /* we want to replace this */
77 for (cons = 0; consoles[cons] != NULL; cons++)
78 /* look for the nominated console, use it if it's functional */
79 if (!strcmp(prefconsole, consoles[cons]->c_name) &&
80 (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)))
81 active = cons;
82 free(prefconsole);
83 }
84 if (active == -1)
85 active = 0;
86 consoles[active]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT);
87 consoles[active]->c_init(0);
88
89 printf("Console: %s\n", consoles[active]->c_desc);
90 env_setenv("console", EV_VOLATILE, consoles[active]->c_name, (ev_sethook_t *) cons_set,
91 env_nounset);
92 }
93
94 int
getchar(void)95 getchar(void)
96 {
97 int cons;
98 int rv;
99
100 /* Loop forever polling all active consoles */
101 for(;;)
102 for (cons = 0; consoles[cons] != NULL; cons++)
103 if ((consoles[cons]->c_flags & C_ACTIVEIN) &&
104 ((rv = consoles[cons]->c_in()) != -1))
105 return(rv);
106 }
107
108 int
ischar(void)109 ischar(void)
110 {
111 int cons;
112
113 for (cons = 0; consoles[cons] != NULL; cons++)
114 if ((consoles[cons]->c_flags & C_ACTIVEIN) &&
115 (consoles[cons]->c_ready() != 0))
116 return(1);
117 return(0);
118 }
119
120 void
putchar(int c)121 putchar(int c)
122 {
123 int cons;
124
125 /* Expand newlines */
126 if (c == '\n')
127 putchar('\r');
128
129 for (cons = 0; consoles[cons] != NULL; cons++)
130 if (consoles[cons]->c_flags & C_ACTIVEOUT)
131 consoles[cons]->c_out(c);
132 }
133
134 static int
cons_find(char * name)135 cons_find(char *name)
136 {
137 int cons;
138
139 for (cons = 0; consoles[cons] != NULL; cons++)
140 if (!strcmp(consoles[cons]->c_name, name))
141 return(cons);
142 return(-1);
143 }
144
145
146 /*
147 * Select a console.
148 *
149 * XXX Note that the console system design allows for some extension
150 * here (eg. multiple consoles, input/output only, etc.)
151 */
152 static int
cons_set(struct env_var * ev,int flags,void * value)153 cons_set(struct env_var *ev, int flags, void *value)
154 {
155 int cons, active;
156
157 if ((value == NULL) || ((active = cons_find(value)) == -1)) {
158 if (value != NULL)
159 printf("no such console '%s'\n", (char *)value);
160 printf("Available consoles:\n");
161 for (cons = 0; consoles[cons] != NULL; cons++)
162 printf(" %s\n", consoles[cons]->c_name);
163 return(CMD_ERROR);
164 }
165
166 /* disable all current consoles */
167 for (cons = 0; consoles[cons] != NULL; cons++)
168 consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT);
169
170 /* enable selected console */
171 consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
172 consoles[active]->c_init(0);
173
174 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
175 return(CMD_OK);
176 }
177