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 1.11 2004/04/20 01:52:22 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>
55 #include <sys/msgport.h>
56 #include <sys/msgport2.h>
57 #include <sys/device.h>
61 #include <machine/cpu.h>
63 static d_open_t cnopen;
64 static d_close_t cnclose;
65 static d_read_t cnread;
66 static d_write_t cnwrite;
67 static d_ioctl_t cnioctl;
68 static d_poll_t cnpoll;
69 static d_kqfilter_t cnkqfilter;
70 static int console_putport(lwkt_port_t port, lwkt_msg_t lmsg);
73 static struct cdevsw cn_cdevsw = {
76 /* flags */ D_TTY | D_KQFILTER,
87 /* strategy */ nostrategy,
90 /* kqfilter */ cnkqfilter
93 static dev_t cn_dev_t; /* seems to be never really used */
94 static udev_t cn_udev_t;
95 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
96 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
100 int cons_unavail = 0; /* XXX:
101 * physical console not available for
102 * input (i.e., it is in graphics mode)
105 static u_char cn_is_open; /* nonzero if logical console is open */
106 static int openmode, openflag; /* how /dev/console was openned */
107 static dev_t cn_devfsdev; /* represents the device private info */
108 static u_char cn_phys_is_open; /* nonzero if physical device is open */
109 struct consdev *cn_tab; /* physical console device info */
110 static u_char console_pausing; /* pause after each line during probe */
111 static char *console_pausestr=
112 "<pause; press any key to proceed to next line or '.' to end pause mode>";
114 static lwkt_port_t cn_fwd_port;
115 static struct lwkt_port cn_port;
118 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
119 SET_DECLARE(cons_set, struct consdev);
124 struct consdev *best_cp, *cp, **list;
129 lwkt_initport(&cn_port, NULL);
130 cn_port.mp_putport = console_putport;
133 * Find the first console with the highest priority.
136 SET_FOREACH(list, cons_set) {
138 if (cp->cn_probe == NULL)
141 if (cp->cn_pri > CN_DEAD &&
142 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
147 * Check if we should mute the console (for security reasons perhaps)
148 * It can be changes dynamically using sysctl kern.consmute
149 * once we are up and going.
152 cn_mute = ((boothowto & (RB_MUTE
156 |RB_CONFIG)) == RB_MUTE);
159 * If no console, give up.
161 if (best_cp == NULL) {
162 if (cn_tab != NULL && cn_tab->cn_term != NULL)
163 (*cn_tab->cn_term)(cn_tab);
169 * Initialize console, then attach to it. This ordering allows
170 * debugging using the previous console, if any.
172 (*best_cp->cn_init)(best_cp);
173 if (cn_tab != NULL && cn_tab != best_cp) {
174 /* Turn off the previous console. */
175 if (cn_tab->cn_term != NULL)
176 (*cn_tab->cn_term)(cn_tab);
178 if (boothowto & RB_PAUSE)
186 if ((cn_tab == NULL) || cn_mute)
190 * Hook the open and close functions.
192 if (dev_dport(cn_tab->cn_dev))
193 cn_fwd_port = cdevsw_dev_override(cn_tab->cn_dev, &cn_port);
194 cn_dev_t = cn_tab->cn_dev;
195 cn_udev_t = dev2udev(cn_dev_t);
206 * Unhook the open and close functions.
208 cdevsw_dev_override(cn_tab->cn_dev, NULL);
215 * User has changed the state of the console muting.
216 * This may require us to open or close the device in question.
219 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
225 error = sysctl_handle_int(oidp, &cn_mute, 0, req);
226 if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) {
227 if(ocn_mute && !cn_mute) {
229 * going from muted to unmuted.. open the physical dev
230 * if the console has been openned
234 /* XXX curproc is not what we want really */
235 error = cnopen(cn_dev_t, openflag,
236 openmode, curthread);
237 /* if it failed, back it out */
238 if ( error != 0) cnuninit();
239 } else if (!ocn_mute && cn_mute) {
241 * going from unmuted to muted.. close the physical dev
242 * if it's only open via /dev/console
245 error = cnclose(cn_dev_t, openflag,
246 openmode, curthread);
247 if ( error == 0) cnuninit();
251 * back out the change if there was an error
259 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
260 0, sizeof cn_mute, sysctl_kern_consmute, "I", "");
263 console_putport(lwkt_port_t port, lwkt_msg_t lmsg)
265 cdevallmsg_t msg = (cdevallmsg_t)lmsg;
268 switch(msg->am_lmsg.ms_cmd.cm_op) {
271 msg->am_open.msg.dev,
273 msg->am_open.devtype,
279 msg->am_close.msg.dev,
281 msg->am_close.devtype,
286 error = lwkt_forwardmsg(cn_fwd_port, &msg->am_lmsg);
293 cnopen(dev, flag, mode, td)
298 dev_t cndev, physdev;
301 if (cn_tab == NULL || cn_fwd_port == NULL)
303 cndev = cn_tab->cn_dev;
304 physdev = (major(dev) == major(cndev) ? dev : cndev);
306 * If mute is active, then non console opens don't get here
307 * so we don't need to check for that. They
308 * bypass this and go straight to the device.
311 retval = dev_port_dopen(cn_fwd_port, physdev, flag, mode, td);
314 * check if we openned it via /dev/console or
315 * via the physical entry (e.g. /dev/sio0).
319 else if (physdev == cndev) {
324 dev->si_tty = physdev->si_tty;
330 cnclose(dev, flag, mode, td)
338 if (cn_tab == NULL || cn_fwd_port == NULL)
340 cndev = cn_tab->cn_dev;
341 cn_tp = cndev->si_tty;
343 * act appropriatly depending on whether it's /dev/console
344 * or the pysical device (e.g. /dev/sio) that's being closed.
345 * in either case, don't actually close the device unless
349 /* the physical device is about to be closed */
353 /* perform a ttyhalfclose() */
354 /* reset session and proc group */
355 cn_tp->t_pgrp = NULL;
356 cn_tp->t_session = NULL;
360 } else if (major(dev) != major(cndev)) {
361 /* the logical console is about to be closed */
368 return (dev_port_dclose(cn_fwd_port, dev, flag, mode, td));
373 cnread(dev, uio, flag)
379 if (cn_tab == NULL || cn_fwd_port == NULL)
381 dev = cn_tab->cn_dev;
382 return (dev_port_dread(cn_fwd_port, dev, uio, flag));
386 cnwrite(dev, uio, flag)
392 if (cn_tab == NULL || cn_fwd_port == NULL) {
393 uio->uio_resid = 0; /* dump the data */
397 dev = constty->t_dev;
399 dev = cn_tab->cn_dev;
401 return (dev_port_dwrite(cn_fwd_port, dev, uio, flag));
405 cnioctl(dev, cmd, data, flag, td)
414 if (cn_tab == NULL || cn_fwd_port == NULL)
416 KKASSERT(td->td_proc != NULL);
418 * Superuser can always use this to wrest control of console
419 * output from the "virtual" console.
421 if (cmd == TIOCCONS && constty) {
428 dev = cn_tab->cn_dev;
429 return (dev_port_dioctl(cn_fwd_port, dev, cmd, data, flag, td));
433 cnpoll(dev, events, td)
438 if ((cn_tab == NULL) || cn_mute || cn_fwd_port == NULL)
441 dev = cn_tab->cn_dev;
443 return (dev_port_dpoll(cn_fwd_port, dev, events, td));
451 if ((cn_tab == NULL) || cn_mute || cn_fwd_port == NULL)
454 dev = cn_tab->cn_dev;
455 return (dev_port_dkqfilter(cn_fwd_port, dev, kn));
462 if ((cn_tab == NULL) || cn_mute)
464 c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
465 if (c == '\r') c = '\n'; /* console input is always ICRNL */
472 if ((cn_tab == NULL) || cn_mute)
474 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
483 if ((cn_tab == NULL) || cn_mute)
487 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
488 (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
490 if (console_pausing && !db_active && (c == '\n')) {
492 if (console_pausing && (c == '\n')) {
494 for(cp=console_pausestr; *cp != '\0'; cp++)
495 (*cn_tab->cn_putc)(cn_tab->cn_dev, *cp);
498 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
499 for(cp=console_pausestr; *cp != '\0'; cp++)
500 (*cn_tab->cn_putc)(cn_tab->cn_dev, ' ');
501 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
516 if (refcount == 0 && cn_tab->cn_dbctl != NULL)
517 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on);
523 cn_drvinit(void *unused)
526 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
530 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)