kern_cons.c revision 7680 
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.c	7.2 (Berkeley) 5/9/91
39 *	$Id: cons.c,v 1.24 1995/04/02 16:14:51 joerg Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/conf.h>
45#include <sys/proc.h>
46#include <sys/tty.h>
47
48#include <machine/cons.h>
49#include <machine/stdarg.h>
50
51/* XXX - all this could be autoconfig()ed */
52#include "sc.h"
53#include "vt.h"
54#if NSC > 0 || NVT > 0
55int pccnprobe(), pccninit(), pccngetc(), pccncheckc(), pccnputc();
56#endif
57
58#include "sio.h"
59#if NSIO > 0
60int siocnprobe(), siocninit(), siocngetc(), siocncheckc(), siocnputc();
61#endif
62
63static struct consdev constab[] = {
64#if NSC > 0 || NVT > 0
65	{ pccnprobe,	pccninit,	pccngetc,	pccncheckc,	pccnputc },
66#endif
67#if NSIO > 0
68	{ siocnprobe,	siocninit,	siocngetc,	siocncheckc,	siocnputc },
69#endif
70	{ 0 },
71};
72/* end XXX */
73
74struct	tty *constty = 0;	/* virtual console output device */
75struct	tty *cn_tty;		/* XXX: console tty struct for tprintf */
76int	cons_unavail = 0;	/* XXX:
77				 * physical console not available for
78				 * input (i.e., it is in graphics mode)
79				 */
80
81static u_char cn_is_open;	/* nonzero if logical console is open */
82static u_char cn_phys_is_open;	/* nonzero if physical console is open */
83static d_close_t *cn_phys_close;	/* physical device close function */
84static d_open_t *cn_phys_open;	/* physical device open function */
85static struct consdev *cn_tab;	/* physical console device info */
86static struct tty *cn_tp;	/* physical console tty struct */
87
88void
89cninit()
90{
91	register struct consdev *cp;
92	struct cdevsw *cdp;
93
94	/*
95	 * Collect information about all possible consoles
96	 * and find the one with highest priority
97	 */
98	for (cp = constab; cp->cn_probe; cp++) {
99		(*cp->cn_probe)(cp);
100		if (cp->cn_pri > CN_DEAD &&
101		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
102			cn_tab = cp;
103	}
104	/*
105	 * No console, give up.
106	 */
107	if ((cp = cn_tab) == NULL)
108		return;
109	/*
110	 * Hook the open and close functions.
111	 */
112	cdp = &cdevsw[major(cn_tab->cn_dev)];
113	cn_phys_close = cdp->d_close;
114	cdp->d_close = cnclose;
115	cn_phys_open = cdp->d_open;
116	cdp->d_open = cnopen;
117	cn_tp = (*cdp->d_devtotty)(cn_tab->cn_dev);
118	/*
119	 * Turn on console
120	 */
121	cn_tty = cp->cn_tp;
122	(*cp->cn_init)(cp);
123}
124
125int
126cnopen(dev, flag, mode, p)
127	dev_t dev;
128	int flag, mode;
129	struct proc *p;
130{
131	dev_t cndev, physdev;
132	int retval;
133
134	if (cn_tab == NULL)
135		return (0);
136	cndev = cn_tab->cn_dev;
137	physdev = (major(dev) == major(cndev) ? dev : cndev);
138	retval = (*cn_phys_open)(physdev, flag, mode, p);
139	if (retval == 0) {
140		if (dev == cndev)
141			cn_phys_is_open = 1;
142		else if (physdev == cndev)
143			cn_is_open = 1;
144	}
145	return (retval);
146}
147
148int
149cnclose(dev, flag, mode, p)
150	dev_t dev;
151	int flag, mode;
152	struct proc *p;
153{
154	dev_t cndev;
155
156	if (cn_tab == NULL)
157		return (0);
158	cndev = cn_tab->cn_dev;
159	if (dev == cndev) {
160		/* the physical device is about to be closed */
161		cn_phys_is_open = 0;
162		if (cn_is_open) {
163			if (cn_tp) {
164				/* perform a ttyhalfclose() */
165				/* reset session and proc group */
166				cn_tp->t_pgrp = NULL;
167				cn_tp->t_session = NULL;
168			}
169			return (0);
170		}
171	} else if (major(dev) != major(cndev)) {
172		/* the logical console is about to be closed */
173		cn_is_open = 0;
174		if (cn_phys_is_open)
175			return (0);
176		dev = cndev;
177	}
178	return ((*cn_phys_close)(dev, flag, mode, p));
179}
180
181int
182cnread(dev, uio, flag)
183	dev_t dev;
184	struct uio *uio;
185	int flag;
186{
187	if (cn_tab == NULL)
188		return (0);
189	dev = cn_tab->cn_dev;
190	return ((*cdevsw[major(dev)].d_read)(dev, uio, flag));
191}
192
193int
194cnwrite(dev, uio, flag)
195	dev_t dev;
196	struct uio *uio;
197	int flag;
198{
199	if (cn_tab == NULL)
200		return (0);
201	if (constty)
202		dev = constty->t_dev;
203	else
204		dev = cn_tab->cn_dev;
205	return ((*cdevsw[major(dev)].d_write)(dev, uio, flag));
206}
207
208int
209cnioctl(dev, cmd, data, flag, p)
210	dev_t dev;
211	int cmd;
212	caddr_t data;
213	int flag;
214	struct proc *p;
215{
216	int error;
217
218	if (cn_tab == NULL)
219		return (0);
220	/*
221	 * Superuser can always use this to wrest control of console
222	 * output from the "virtual" console.
223	 */
224	if (cmd == TIOCCONS && constty) {
225		error = suser(p->p_ucred, (u_short *) NULL);
226		if (error)
227			return (error);
228		constty = NULL;
229		return (0);
230	}
231	dev = cn_tab->cn_dev;
232	return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p));
233}
234
235/*ARGSUSED*/
236int
237cnselect(dev, rw, p)
238	dev_t dev;
239	int rw;
240	struct proc *p;
241{
242	if (cn_tab == NULL)
243		return (1);
244
245	dev = cn_tab->cn_dev;
246
247	return ((*cdevsw[major(dev)].d_select)(dev, rw, p));
248}
249
250int
251cngetc()
252{
253	int c;
254	if (cn_tab == NULL)
255		return (0);
256	c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
257	if (c == '\r') c = '\n'; /* console input is always ICRNL */
258	return (c);
259}
260
261int
262cncheckc()
263{
264	if (cn_tab == NULL)
265		return (0);
266	return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
267}
268
269void
270cnputc(c)
271	register int c;
272{
273	if (cn_tab == NULL)
274		return;
275	if (c) {
276		(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
277		if (c == '\n')
278			(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
279	}
280}
281
282int
283pg(const char *p, ...) {
284  va_list args;
285  va_start(args, p);
286  printf("%r\n>", p, args);
287  return(cngetc());
288}
289
290
291