Linux needs %edx to be 0 on entry. It registers it as an atexit function if
[dragonfly.git] / sys / sys / cons.h
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1/*
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: @(#)cons.h 7.2 (Berkeley) 5/9/91
39 * $FreeBSD: src/sys/sys/cons.h,v 1.24 2000/01/11 14:54:01 yokota Exp $
1de703da 40 * $DragonFly: src/sys/sys/cons.h,v 1.2 2003/06/17 04:28:58 dillon Exp $
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41 */
42
43#ifndef _MACHINE_CONS_H_
44#define _MACHINE_CONS_H_
45
46struct consdev;
47typedef void cn_probe_t __P((struct consdev *));
48typedef void cn_init_t __P((struct consdev *));
49typedef void cn_term_t __P((struct consdev *));
50typedef int cn_getc_t __P((dev_t));
51typedef int cn_checkc_t __P((dev_t));
52typedef void cn_putc_t __P((dev_t, int));
53typedef void cn_dbctl_t __P((dev_t, int));
54
55struct consdev {
56 cn_probe_t *cn_probe;
57 /* probe hardware and fill in consdev info */
58 cn_init_t *cn_init;
59 /* turn on as console */
60 cn_term_t *cn_term;
61 /* turn off as console */
62 cn_getc_t *cn_getc;
63 /* kernel getchar interface */
64 cn_checkc_t *cn_checkc;
65 /* kernel "return char if available" interface */
66 cn_putc_t *cn_putc;
67 /* kernel putchar interface */
68 cn_dbctl_t *cn_dbctl;
69 /* debugger control interface */
70 struct tty *cn_tp; /* tty structure for console device */
71 dev_t cn_dev; /* major/minor of device */
72 short cn_pri; /* pecking order; the higher the better */
73};
74
75/* values for cn_pri - reflect our policy for console selection */
76#define CN_DEAD 0 /* device doesn't exist */
77#define CN_NORMAL 1 /* device exists but is nothing special */
78#define CN_INTERNAL 2 /* "internal" bit-mapped display */
79#define CN_REMOTE 3 /* serial interface with remote bit set */
80
81#ifdef _KERNEL
82extern struct linker_set cons_set;
83extern int cons_unavail;
84extern struct consdev *cn_tab;
85
86#define CONS_DRIVER(name, probe, init, term, getc, checkc, putc, dbctl) \
87 static struct consdev name##_consdev = { \
88 probe, init, term, getc, checkc, putc, dbctl \
89 }; \
90 DATA_SET(cons_set, name##_consdev)
91
92/* Other kernel entry points. */
93int cncheckc __P((void));
94int cngetc __P((void));
95void cninit __P((void));
96void cninit_finish __P((void));
97void cndbctl __P((int));
98void cnputc __P((int));
99
100#endif /* _KERNEL */
101
102#endif /* !_MACHINE_CONS_H_ */