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 1.5 2003/07/21 05:50:43 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 = {
72 /* flags */ D_TTY | D_KQFILTER,
83 /* strategy */ nostrategy,
86 /* kqfilter */ cnkqfilter
89 static dev_t cn_dev_t; /* seems to be never really used */
90 static udev_t cn_udev_t;
91 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
92 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
96 int cons_unavail = 0; /* XXX:
97 * physical console not available for
98 * input (i.e., it is in graphics mode)
101 static u_char cn_is_open; /* nonzero if logical console is open */
102 static int openmode, openflag; /* how /dev/console was openned */
103 static dev_t cn_devfsdev; /* represents the device private info */
104 static u_char cn_phys_is_open; /* nonzero if physical device is open */
105 static d_close_t *cn_phys_close; /* physical device close function */
106 static d_open_t *cn_phys_open; /* physical device open function */
107 struct consdev *cn_tab; /* physical console device info */
108 static u_char console_pausing; /* pause after each line during probe */
109 static char *console_pausestr=
110 "<pause; press any key to proceed to next line or '.' to end pause mode>";
112 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
117 struct consdev *best_cp, *cp, **list;
120 * Find the first console with the highest priority.
123 list = (struct consdev **)cons_set.ls_items;
124 while ((cp = *list++) != NULL) {
125 if (cp->cn_probe == NULL)
128 if (cp->cn_pri > CN_DEAD &&
129 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
134 * Check if we should mute the console (for security reasons perhaps)
135 * It can be changes dynamically using sysctl kern.consmute
136 * once we are up and going.
139 cn_mute = ((boothowto & (RB_MUTE
143 |RB_CONFIG)) == RB_MUTE);
146 * If no console, give up.
148 if (best_cp == NULL) {
149 if (cn_tab != NULL && cn_tab->cn_term != NULL)
150 (*cn_tab->cn_term)(cn_tab);
156 * Initialize console, then attach to it. This ordering allows
157 * debugging using the previous console, if any.
159 (*best_cp->cn_init)(best_cp);
160 if (cn_tab != NULL && cn_tab != best_cp) {
161 /* Turn off the previous console. */
162 if (cn_tab->cn_term != NULL)
163 (*cn_tab->cn_term)(cn_tab);
165 if (boothowto & RB_PAUSE)
175 if ((cn_tab == NULL) || cn_mute)
179 * Hook the open and close functions.
181 cdp = devsw(cn_tab->cn_dev);
183 cn_phys_close = cdp->d_close;
184 cdp->d_close = cnclose;
185 cn_phys_open = cdp->d_open;
186 cdp->d_open = cnopen;
188 cn_dev_t = cn_tab->cn_dev;
189 cn_udev_t = dev2udev(cn_dev_t);
202 * Unhook the open and close functions.
204 cdp = devsw(cn_tab->cn_dev);
206 cdp->d_close = cn_phys_close;
207 cdp->d_open = cn_phys_open;
209 cn_phys_close = NULL;
216 * User has changed the state of the console muting.
217 * This may require us to open or close the device in question.
220 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
226 error = sysctl_handle_int(oidp, &cn_mute, 0, req);
227 if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) {
228 if(ocn_mute && !cn_mute) {
230 * going from muted to unmuted.. open the physical dev
231 * if the console has been openned
235 /* XXX curproc is not what we want really */
236 error = cnopen(cn_dev_t, openflag,
237 openmode, curthread);
238 /* if it failed, back it out */
239 if ( error != 0) cnuninit();
240 } else if (!ocn_mute && cn_mute) {
242 * going from unmuted to muted.. close the physical dev
243 * if it's only open via /dev/console
246 error = cnclose(cn_dev_t, openflag,
247 openmode, curthread);
248 if ( error == 0) cnuninit();
252 * back out the change if there was an error
260 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
261 0, sizeof cn_mute, sysctl_kern_consmute, "I", "");
264 cnopen(dev, flag, mode, td)
269 dev_t cndev, physdev;
272 if (cn_tab == NULL || cn_phys_open == NULL)
274 cndev = cn_tab->cn_dev;
275 physdev = (major(dev) == major(cndev) ? dev : cndev);
277 * If mute is active, then non console opens don't get here
278 * so we don't need to check for that. They
279 * bypass this and go straight to the device.
282 retval = (*cn_phys_open)(physdev, flag, mode, td);
285 * check if we openned it via /dev/console or
286 * via the physical entry (e.g. /dev/sio0).
290 else if (physdev == cndev) {
295 dev->si_tty = physdev->si_tty;
301 cnclose(dev, flag, mode, td)
309 if (cn_tab == NULL || cn_phys_open == NULL)
311 cndev = cn_tab->cn_dev;
312 cn_tp = cndev->si_tty;
314 * act appropriatly depending on whether it's /dev/console
315 * or the pysical device (e.g. /dev/sio) that's being closed.
316 * in either case, don't actually close the device unless
320 /* the physical device is about to be closed */
324 /* perform a ttyhalfclose() */
325 /* reset session and proc group */
326 cn_tp->t_pgrp = NULL;
327 cn_tp->t_session = NULL;
331 } else if (major(dev) != major(cndev)) {
332 /* the logical console is about to be closed */
339 return ((*cn_phys_close)(dev, flag, mode, td));
344 cnread(dev, uio, flag)
350 if (cn_tab == NULL || cn_phys_open == NULL)
352 dev = cn_tab->cn_dev;
353 return ((*devsw(dev)->d_read)(dev, uio, flag));
357 cnwrite(dev, uio, flag)
363 if (cn_tab == NULL || cn_phys_open == NULL) {
364 uio->uio_resid = 0; /* dump the data */
368 dev = constty->t_dev;
370 dev = cn_tab->cn_dev;
372 return ((*devsw(dev)->d_write)(dev, uio, flag));
376 cnioctl(dev, cmd, data, flag, td)
385 if (cn_tab == NULL || cn_phys_open == NULL)
387 KKASSERT(td->td_proc != NULL);
389 * Superuser can always use this to wrest control of console
390 * output from the "virtual" console.
392 if (cmd == TIOCCONS && constty) {
399 dev = cn_tab->cn_dev;
400 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, td));
404 cnpoll(dev, events, td)
409 if ((cn_tab == NULL) || cn_mute)
412 dev = cn_tab->cn_dev;
414 return ((*devsw(dev)->d_poll)(dev, events, td));
422 if ((cn_tab == NULL) || cn_mute)
425 dev = cn_tab->cn_dev;
426 if (devsw(dev)->d_flags & D_KQFILTER)
427 return ((*devsw(dev)->d_kqfilter)(dev, kn));
435 if ((cn_tab == NULL) || cn_mute)
437 c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
438 if (c == '\r') c = '\n'; /* console input is always ICRNL */
445 if ((cn_tab == NULL) || cn_mute)
447 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
456 if ((cn_tab == NULL) || cn_mute)
460 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
461 (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
463 if (console_pausing && !db_active && (c == '\n')) {
465 if (console_pausing && (c == '\n')) {
467 for(cp=console_pausestr; *cp != '\0'; cp++)
468 (*cn_tab->cn_putc)(cn_tab->cn_dev, *cp);
471 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
472 for(cp=console_pausestr; *cp != '\0'; cp++)
473 (*cn_tab->cn_putc)(cn_tab->cn_dev, ' ');
474 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
489 if (refcount == 0 && cn_tab->cn_dbctl != NULL)
490 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on);
496 cn_drvinit(void *unused)
499 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
503 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)