2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
38 * from: @(#)cons.c 7.2 (Berkeley) 5/9/91
39 * $FreeBSD: src/sys/kern/tty_cons.c,v 1.81.2.4 2001/12/17 18:44:41 guido Exp $
40 * $DragonFly: src/sys/kern/tty_cons.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/reboot.h>
52 #include <sys/sysctl.h>
58 #include <machine/cpu.h>
60 static d_open_t cnopen;
61 static d_close_t cnclose;
62 static d_read_t cnread;
63 static d_write_t cnwrite;
64 static d_ioctl_t cnioctl;
65 static d_poll_t cnpoll;
66 static d_kqfilter_t cnkqfilter;
69 static struct cdevsw cn_cdevsw = {
77 /* strategy */ nostrategy,
82 /* flags */ D_TTY | D_KQFILTER,
84 /* kqfilter */ cnkqfilter,
87 static dev_t cn_dev_t; /* seems to be never really used */
88 static udev_t cn_udev_t;
89 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
90 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
94 int cons_unavail = 0; /* XXX:
95 * physical console not available for
96 * input (i.e., it is in graphics mode)
99 static u_char cn_is_open; /* nonzero if logical console is open */
100 static int openmode, openflag; /* how /dev/console was openned */
101 static dev_t cn_devfsdev; /* represents the device private info */
102 static u_char cn_phys_is_open; /* nonzero if physical device is open */
103 static d_close_t *cn_phys_close; /* physical device close function */
104 static d_open_t *cn_phys_open; /* physical device open function */
105 struct consdev *cn_tab; /* physical console device info */
106 static u_char console_pausing; /* pause after each line during probe */
107 static char *console_pausestr=
108 "<pause; press any key to proceed to next line or '.' to end pause mode>";
110 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
115 struct consdev *best_cp, *cp, **list;
118 * Find the first console with the highest priority.
121 list = (struct consdev **)cons_set.ls_items;
122 while ((cp = *list++) != NULL) {
123 if (cp->cn_probe == NULL)
126 if (cp->cn_pri > CN_DEAD &&
127 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
132 * Check if we should mute the console (for security reasons perhaps)
133 * It can be changes dynamically using sysctl kern.consmute
134 * once we are up and going.
137 cn_mute = ((boothowto & (RB_MUTE
141 |RB_CONFIG)) == RB_MUTE);
144 * If no console, give up.
146 if (best_cp == NULL) {
147 if (cn_tab != NULL && cn_tab->cn_term != NULL)
148 (*cn_tab->cn_term)(cn_tab);
154 * Initialize console, then attach to it. This ordering allows
155 * debugging using the previous console, if any.
157 (*best_cp->cn_init)(best_cp);
158 if (cn_tab != NULL && cn_tab != best_cp) {
159 /* Turn off the previous console. */
160 if (cn_tab->cn_term != NULL)
161 (*cn_tab->cn_term)(cn_tab);
163 if (boothowto & RB_PAUSE)
173 if ((cn_tab == NULL) || cn_mute)
177 * Hook the open and close functions.
179 cdp = devsw(cn_tab->cn_dev);
181 cn_phys_close = cdp->d_close;
182 cdp->d_close = cnclose;
183 cn_phys_open = cdp->d_open;
184 cdp->d_open = cnopen;
186 cn_dev_t = cn_tab->cn_dev;
187 cn_udev_t = dev2udev(cn_dev_t);
200 * Unhook the open and close functions.
202 cdp = devsw(cn_tab->cn_dev);
204 cdp->d_close = cn_phys_close;
205 cdp->d_open = cn_phys_open;
207 cn_phys_close = NULL;
214 * User has changed the state of the console muting.
215 * This may require us to open or close the device in question.
218 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
224 error = sysctl_handle_int(oidp, &cn_mute, 0, req);
225 if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) {
226 if(ocn_mute && !cn_mute) {
228 * going from muted to unmuted.. open the physical dev
229 * if the console has been openned
233 /* XXX curproc is not what we want really */
234 error = cnopen(cn_dev_t, openflag,
236 /* if it failed, back it out */
237 if ( error != 0) cnuninit();
238 } else if (!ocn_mute && cn_mute) {
240 * going from unmuted to muted.. close the physical dev
241 * if it's only open via /dev/console
244 error = cnclose(cn_dev_t, openflag,
246 if ( error == 0) cnuninit();
250 * back out the change if there was an error
258 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
259 0, sizeof cn_mute, sysctl_kern_consmute, "I", "");
262 cnopen(dev, flag, mode, p)
267 dev_t cndev, physdev;
270 if (cn_tab == NULL || cn_phys_open == NULL)
272 cndev = cn_tab->cn_dev;
273 physdev = (major(dev) == major(cndev) ? dev : cndev);
275 * If mute is active, then non console opens don't get here
276 * so we don't need to check for that. They
277 * bypass this and go straight to the device.
280 retval = (*cn_phys_open)(physdev, flag, mode, p);
283 * check if we openned it via /dev/console or
284 * via the physical entry (e.g. /dev/sio0).
288 else if (physdev == cndev) {
293 dev->si_tty = physdev->si_tty;
299 cnclose(dev, flag, mode, p)
307 if (cn_tab == NULL || cn_phys_open == NULL)
309 cndev = cn_tab->cn_dev;
310 cn_tp = cndev->si_tty;
312 * act appropriatly depending on whether it's /dev/console
313 * or the pysical device (e.g. /dev/sio) that's being closed.
314 * in either case, don't actually close the device unless
318 /* the physical device is about to be closed */
322 /* perform a ttyhalfclose() */
323 /* reset session and proc group */
324 cn_tp->t_pgrp = NULL;
325 cn_tp->t_session = NULL;
329 } else if (major(dev) != major(cndev)) {
330 /* the logical console is about to be closed */
337 return ((*cn_phys_close)(dev, flag, mode, p));
342 cnread(dev, uio, flag)
348 if (cn_tab == NULL || cn_phys_open == NULL)
350 dev = cn_tab->cn_dev;
351 return ((*devsw(dev)->d_read)(dev, uio, flag));
355 cnwrite(dev, uio, flag)
361 if (cn_tab == NULL || cn_phys_open == NULL) {
362 uio->uio_resid = 0; /* dump the data */
366 dev = constty->t_dev;
368 dev = cn_tab->cn_dev;
370 return ((*devsw(dev)->d_write)(dev, uio, flag));
374 cnioctl(dev, cmd, data, flag, p)
383 if (cn_tab == NULL || cn_phys_open == NULL)
386 * Superuser can always use this to wrest control of console
387 * output from the "virtual" console.
389 if (cmd == TIOCCONS && constty) {
396 dev = cn_tab->cn_dev;
397 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, p));
401 cnpoll(dev, events, p)
406 if ((cn_tab == NULL) || cn_mute)
409 dev = cn_tab->cn_dev;
411 return ((*devsw(dev)->d_poll)(dev, events, p));
419 if ((cn_tab == NULL) || cn_mute)
422 dev = cn_tab->cn_dev;
423 if (devsw(dev)->d_flags & D_KQFILTER)
424 return ((*devsw(dev)->d_kqfilter)(dev, kn));
432 if ((cn_tab == NULL) || cn_mute)
434 c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
435 if (c == '\r') c = '\n'; /* console input is always ICRNL */
442 if ((cn_tab == NULL) || cn_mute)
444 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
453 if ((cn_tab == NULL) || cn_mute)
457 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
458 (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
460 if (console_pausing && !db_active && (c == '\n')) {
462 if (console_pausing && (c == '\n')) {
464 for(cp=console_pausestr; *cp != '\0'; cp++)
465 (*cn_tab->cn_putc)(cn_tab->cn_dev, *cp);
468 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
469 for(cp=console_pausestr; *cp != '\0'; cp++)
470 (*cn_tab->cn_putc)(cn_tab->cn_dev, ' ');
471 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
486 if (refcount == 0 && cn_tab->cn_dbctl != NULL)
487 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on);
493 cn_drvinit(void *unused)
496 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
500 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)