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
42 #include <sys/param.h>
43 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/reboot.h>
48 #include <sys/sysctl.h>
53 #include <machine/cpu.h>
55 static d_open_t cnopen;
56 static d_close_t cnclose;
57 static d_read_t cnread;
58 static d_write_t cnwrite;
59 static d_ioctl_t cnioctl;
60 static d_poll_t cnpoll;
63 static struct cdevsw cn_cdevsw = {
71 /* strategy */ nostrategy,
80 static dev_t cn_dev_t; /* seems to be never really used */
81 static udev_t cn_udev_t;
82 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
83 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
87 int cons_unavail = 0; /* XXX:
88 * physical console not available for
89 * input (i.e., it is in graphics mode)
92 static u_char cn_is_open; /* nonzero if logical console is open */
93 static int openmode, openflag; /* how /dev/console was openned */
94 static dev_t cn_devfsdev; /* represents the device private info */
95 static u_char cn_phys_is_open; /* nonzero if physical device is open */
96 static d_close_t *cn_phys_close; /* physical device close function */
97 static d_open_t *cn_phys_open; /* physical device open function */
98 struct consdev *cn_tab; /* physical console device info */
100 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
105 struct consdev *best_cp, *cp, **list;
108 * Find the first console with the highest priority.
111 list = (struct consdev **)cons_set.ls_items;
112 while ((cp = *list++) != NULL) {
113 if (cp->cn_probe == NULL)
116 if (cp->cn_pri > CN_DEAD &&
117 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
122 * Check if we should mute the console (for security reasons perhaps)
123 * It can be changes dynamically using sysctl kern.consmute
124 * once we are up and going.
127 cn_mute = ((boothowto & (RB_MUTE
131 |RB_CONFIG)) == RB_MUTE);
134 * If no console, give up.
136 if (best_cp == NULL) {
137 if (cn_tab != NULL && cn_tab->cn_term != NULL)
138 (*cn_tab->cn_term)(cn_tab);
144 * Initialize console, then attach to it. This ordering allows
145 * debugging using the previous console, if any.
147 (*best_cp->cn_init)(best_cp);
148 if (cn_tab != NULL && cn_tab != best_cp) {
149 /* Turn off the previous console. */
150 if (cn_tab->cn_term != NULL)
151 (*cn_tab->cn_term)(cn_tab);
161 if ((cn_tab == NULL) || cn_mute)
165 * Hook the open and close functions.
167 cdp = devsw(cn_tab->cn_dev);
169 cn_phys_close = cdp->d_close;
170 cdp->d_close = cnclose;
171 cn_phys_open = cdp->d_open;
172 cdp->d_open = cnopen;
174 cn_dev_t = cn_tab->cn_dev;
175 cn_udev_t = dev2udev(cn_dev_t);
187 * Unhook the open and close functions.
189 cdp = devsw(cn_tab->cn_dev);
191 cdp->d_close = cn_phys_close;
192 cdp->d_open = cn_phys_open;
194 cn_phys_close = NULL;
201 * User has changed the state of the console muting.
202 * This may require us to open or close the device in question.
205 sysctl_kern_consmute SYSCTL_HANDLER_ARGS
211 error = sysctl_handle_int(oidp, &cn_mute, 0, req);
212 if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) {
213 if(ocn_mute && !cn_mute) {
215 * going from muted to unmuted.. open the physical dev
216 * if the console has been openned
220 /* XXX curproc is not what we want really */
221 error = cnopen(cn_dev_t, openflag,
223 /* if it failed, back it out */
224 if ( error != 0) cnuninit();
225 } else if (!ocn_mute && cn_mute) {
227 * going from unmuted to muted.. close the physical dev
228 * if it's only open via /dev/console
231 error = cnclose(cn_dev_t, openflag,
233 if ( error == 0) cnuninit();
237 * back out the change if there was an error
245 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
246 0, sizeof cn_mute, sysctl_kern_consmute, "I", "");
249 cnopen(dev, flag, mode, p)
254 dev_t cndev, physdev;
257 if (cn_tab == NULL || cn_phys_open == NULL)
259 cndev = cn_tab->cn_dev;
260 physdev = (major(dev) == major(cndev) ? dev : cndev);
262 * If mute is active, then non console opens don't get here
263 * so we don't need to check for that. They
264 * bypass this and go straight to the device.
267 retval = (*cn_phys_open)(physdev, flag, mode, p);
270 * check if we openned it via /dev/console or
271 * via the physical entry (e.g. /dev/sio0).
275 else if (physdev == cndev) {
280 dev->si_tty = physdev->si_tty;
286 cnclose(dev, flag, mode, p)
294 if (cn_tab == NULL || cn_phys_open == NULL)
296 cndev = cn_tab->cn_dev;
297 cn_tp = cndev->si_tty;
299 * act appropriatly depending on whether it's /dev/console
300 * or the pysical device (e.g. /dev/sio) that's being closed.
301 * in either case, don't actually close the device unless
305 /* the physical device is about to be closed */
309 /* perform a ttyhalfclose() */
310 /* reset session and proc group */
311 cn_tp->t_pgrp = NULL;
312 cn_tp->t_session = NULL;
316 } else if (major(dev) != major(cndev)) {
317 /* the logical console is about to be closed */
324 return ((*cn_phys_close)(dev, flag, mode, p));
329 cnread(dev, uio, flag)
335 if (cn_tab == NULL || cn_phys_open == NULL)
337 dev = cn_tab->cn_dev;
338 return ((*devsw(dev)->d_read)(dev, uio, flag));
342 cnwrite(dev, uio, flag)
348 if (cn_tab == NULL || cn_phys_open == NULL) {
349 uio->uio_resid = 0; /* dump the data */
353 dev = constty->t_dev;
355 dev = cn_tab->cn_dev;
356 return ((*devsw(dev)->d_write)(dev, uio, flag));
360 cnioctl(dev, cmd, data, flag, p)
369 if (cn_tab == NULL || cn_phys_open == NULL)
372 * Superuser can always use this to wrest control of console
373 * output from the "virtual" console.
375 if (cmd == TIOCCONS && constty) {
382 dev = cn_tab->cn_dev;
383 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, p));
387 cnpoll(dev, events, p)
392 if ((cn_tab == NULL) || cn_mute)
395 dev = cn_tab->cn_dev;
397 return ((*devsw(dev)->d_poll)(dev, events, p));
404 if ((cn_tab == NULL) || cn_mute)
406 c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
407 if (c == '\r') c = '\n'; /* console input is always ICRNL */
414 if ((cn_tab == NULL) || cn_mute)
416 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
423 if ((cn_tab == NULL) || cn_mute)
427 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
428 (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
442 if (refcount == 0 && cn_tab->cn_dbctl != NULL)
443 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on);
449 cn_drvinit(void *unused)
452 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
456 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)