kern_cons.c revision 629 
1284345Ssjg/*
2284345Ssjg * Copyright (c) 1988 University of Utah.
3284345Ssjg * Copyright (c) 1991 The Regents of the University of California.
4284345Ssjg * All rights reserved.
5284345Ssjg *
6284345Ssjg * This code is derived from software contributed to Berkeley by
7284345Ssjg * the Systems Programming Group of the University of Utah Computer
8284345Ssjg * Science Department.
9284345Ssjg *
10284345Ssjg * Redistribution and use in source and binary forms, with or without
11284345Ssjg * 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.c	7.2 (Berkeley) 5/9/91
39 *	$Id: cons.c,v 1.3 1993/10/16 14:14:49 rgrimes Exp $
40 */
41
42
43#include "sys/param.h"
44#include "sys/proc.h"
45#include "sys/user.h"
46#include "sys/systm.h"
47#include "sys/buf.h"
48#include "sys/ioctl.h"
49#include "sys/tty.h"
50#include "sys/file.h"
51#include "sys/conf.h"
52
53#include "cons.h"
54
55/* XXX - all this could be autoconfig()ed */
56int pccnprobe(), pccninit(), pccngetc(), pccnputc();
57#include "com.h"
58#if NCOM > 0
59int comcnprobe(), comcninit(), comcngetc(), comcnputc();
60#endif
61
62struct	consdev constab[] = {
63	{ pccnprobe,	pccninit,	pccngetc,	pccnputc },
64#if NCOM > 0
65	{ comcnprobe,	comcninit,	comcngetc,	comcnputc },
66#endif
67	{ 0 },
68};
69/* end XXX */
70
71struct	tty *constty = 0;	/* virtual console output device */
72struct	consdev *cn_tab;	/* physical console device info */
73struct	tty *cn_tty;		/* XXX: console tty struct for tprintf */
74
75cninit()
76{
77	register struct consdev *cp;
78
79	/*
80	 * Collect information about all possible consoles
81	 * and find the one with highest priority
82	 */
83	for (cp = constab; cp->cn_probe; cp++) {
84		(*cp->cn_probe)(cp);
85		if (cp->cn_pri > CN_DEAD &&
86		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
87			cn_tab = cp;
88	}
89	/*
90	 * No console, we can handle it
91	 */
92	if ((cp = cn_tab) == NULL)
93		return;
94	/*
95	 * Turn on console
96	 */
97	cn_tty = cp->cn_tp;
98	(*cp->cn_init)(cp);
99}
100
101cnopen(dev, flag, mode, p)
102	dev_t dev;
103	int flag, mode;
104	struct proc *p;
105{
106	if (cn_tab == NULL)
107		return (0);
108	dev = cn_tab->cn_dev;
109	return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
110}
111
112cnclose(dev, flag, mode, p)
113	dev_t dev;
114	int flag, mode;
115	struct proc *p;
116{
117	if (cn_tab == NULL)
118		return (0);
119	dev = cn_tab->cn_dev;
120	return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
121}
122
123cnread(dev, uio, flag)
124	dev_t dev;
125	struct uio *uio;
126{
127	if (cn_tab == NULL)
128		return (0);
129	dev = cn_tab->cn_dev;
130	return ((*cdevsw[major(dev)].d_read)(dev, uio, flag));
131}
132
133cnwrite(dev, uio, flag)
134	dev_t dev;
135	struct uio *uio;
136{
137	if (cn_tab == NULL)
138		return (0);
139	if (constty)					/* 16 Aug 92*/
140		dev = constty->t_dev;
141	else
142		dev = cn_tab->cn_dev;
143	return ((*cdevsw[major(dev)].d_write)(dev, uio, flag));
144}
145
146cnioctl(dev, cmd, data, flag, p)
147	dev_t dev;
148	caddr_t data;
149	struct proc *p;
150{
151	int error;
152
153	if (cn_tab == NULL)
154		return (0);
155	/*
156	 * Superuser can always use this to wrest control of console
157	 * output from the "virtual" console.
158	 */
159	if (cmd == TIOCCONS && constty) {
160		error = suser(p->p_ucred, (u_short *) NULL);
161		if (error)
162			return (error);
163		constty = NULL;
164		return (0);
165	}
166	dev = cn_tab->cn_dev;
167	return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p));
168}
169
170/*ARGSUSED*/
171cnselect(dev, rw, p)
172	dev_t dev;
173	int rw;
174	struct proc *p;
175{
176	if (cn_tab == NULL)
177		return (1);
178	return (ttselect(cn_tab->cn_dev, rw, p));
179}
180
181cngetc()
182{
183	if (cn_tab == NULL)
184		return (0);
185	return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
186}
187
188cnputc(c)
189	register int c;
190{
191	if (cn_tab == NULL)
192		return;
193	if (c) {
194		(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
195		if (c == '\n')
196			(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
197	}
198}
199
200pg(p,q,r,s,t,u,v,w,x,y,z) char *p; {
201	printf(p,q,r,s,t,u,v,w,x,y,z);
202	printf("\n>");
203	return(cngetc());
204}
205
206
207