spinconsole.c revision 66133 
1/*
2 * nullconsole.c
3 *
4 * Copyright (c) 2000 Whistle Communications, Inc.
5 * All rights reserved.
6 *
7 * Subject to the following obligations and disclaimer of warranty, use and
8 * redistribution of this software, in source or object code forms, with or
9 * without modifications are expressly permitted by Whistle Communications;
10 * provided, however, that:
11 * 1. Any and all reproductions of the source or object code must include the
12 *    copyright notice above and the following disclaimer of warranties; and
13 * 2. No rights are granted, in any manner or form, to use Whistle
14 *    Communications, Inc. trademarks, including the mark "WHISTLE
15 *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
16 *    such appears in the above copyright notice or in the software.
17 *
18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
35 *
36 * Author: Doug Ambrisko <ambrisko@whistle.com>
37 *
38 * $FreeBSD: head/sys/boot/i386/libi386/nullconsole.c 66133 2000-09-20 18:13:36Z archie $
39 */
40
41#include <stand.h>
42#include <bootstrap.h>
43
44static void	nullc_probe(struct console *cp);
45static int	nullc_init(int arg);
46static void	nullc_putchar(int c);
47static int	nullc_getchar(void);
48static int	nullc_ischar(void);
49
50struct console nullconsole = {
51	"nullconsole",
52	"null port",
53	0,
54	nullc_probe,
55	nullc_init,
56	nullc_putchar,
57	nullc_getchar,
58	nullc_ischar
59};
60
61static void
62nullc_probe(struct console *cp)
63{
64	cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
65}
66
67static int
68nullc_init(int arg)
69{
70	return(0);
71}
72
73static void
74nullc_putchar(int c)
75{
76}
77
78static int
79nullc_getchar(void)
80{
81	return(-1);
82}
83
84static int
85nullc_ischar(void)
86{
87	return(0);
88}
89