1 /*-
2  * Copyright (c) 2011 Google, Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <stand.h>
31 #include "bootstrap.h"
32 #include "libuserboot.h"
33 
34 int console;
35 
36 static struct console *userboot_comconsp;
37 
38 static void userboot_cons_probe(struct console *cp);
39 static int userboot_cons_init(int);
40 static void userboot_comcons_probe(struct console *cp);
41 static int userboot_comcons_init(int);
42 static void userboot_cons_putchar(int);
43 static int userboot_cons_getchar(void);
44 static int userboot_cons_poll(void);
45 
46 struct console userboot_console = {
47 	"userboot",
48 	"userboot",
49 	0,
50 	userboot_cons_probe,
51 	userboot_cons_init,
52 	userboot_cons_putchar,
53 	userboot_cons_getchar,
54 	userboot_cons_poll,
55 };
56 
57 /*
58  * Provide a simple alias to allow loader scripts to set the
59  * console to comconsole without resulting in an error
60  */
61 struct console userboot_comconsole = {
62 	"comconsole",
63 	"comconsole",
64 	0,
65 	userboot_comcons_probe,
66 	userboot_comcons_init,
67 	userboot_cons_putchar,
68 	userboot_cons_getchar,
69 	userboot_cons_poll,
70 };
71 
72 static void
73 userboot_cons_probe(struct console *cp)
74 {
75 
76 	cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
77 }
78 
79 static int
80 userboot_cons_init(int arg)
81 {
82 
83 	return (0);
84 }
85 
86 static void
87 userboot_comcons_probe(struct console *cp)
88 {
89 
90 	/*
91 	 * Save the console pointer so the comcons_init routine
92 	 * can set the C_PRESENT* flags. They are not set
93 	 * here to allow the existing userboot console to
94 	 * be elected the default.
95 	 */
96 	userboot_comconsp = cp;
97 }
98 
99 static int
100 userboot_comcons_init(int arg)
101 {
102 
103 	/*
104 	 * Set the C_PRESENT* flags to allow the comconsole
105 	 * to be selected as the active console
106 	 */
107 	userboot_comconsp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
108 	return (0);
109 }
110 
111 static void
112 userboot_cons_putchar(int c)
113 {
114 
115         CALLBACK(putc, c);
116 }
117 
118 static int
119 userboot_cons_getchar()
120 {
121 
122 	return (CALLBACK(getc));
123 }
124 
125 static int
126 userboot_cons_poll()
127 {
128 
129 	return (CALLBACK(poll));
130 }
131