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 1.6 2003/07/22 17:03:33 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);
123 struct consdev *best_cp, *cp, **list;
128 lwkt_init_port(&cn_port, NULL);
129 cn_port.mp_beginmsg = console_putport;
132 * Find the first console with the highest priority.
135 list = (struct consdev **)cons_set.ls_items;
136 while ((cp = *list++) != NULL) {
137 if (cp->cn_probe == NULL)
140 if (cp->cn_pri > CN_DEAD &&
141 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
146 * Check if we should mute the console (for security reasons perhaps)
147 * It can be changes dynamically using sysctl kern.consmute
148 * once we are up and going.
151 cn_mute = ((boothowto & (RB_MUTE
155 |RB_CONFIG)) == RB_MUTE);
158 * If no console, give up.
160 if (best_cp == NULL) {
161 if (cn_tab != NULL && cn_tab->cn_term != NULL)
162 (*cn_tab->cn_term)(cn_tab);
168 * Initialize console, then attach to it. This ordering allows
169 * debugging using the previous console, if any.
171 (*best_cp->cn_init)(best_cp);
172 if (cn_tab != NULL && cn_tab != best_cp) {
173 /* Turn off the previous console. */
174 if (cn_tab->cn_term != NULL)
175 (*cn_tab->cn_term)(cn_tab);
177 if (boothowto & RB_PAUSE)
185 if ((cn_tab == NULL) || cn_mute)
189 * Hook the open and close functions.
191 if (dev_dport(cn_tab->cn_dev))
192 cn_fwd_port = cdevsw_dev_override(cn_tab->cn_dev, &cn_port);
193 cn_dev_t = cn_tab->cn_dev;
194 cn_udev_t = dev2udev(cn_dev_t);
205 * Unhook the open and close functions.
207 cdevsw_dev_override(cn_tab->cn_dev, 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,
235 openmode, curthread);
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,
245 openmode, curthread);
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 console_putport(lwkt_port_t port, lwkt_msg_t lmsg)
264 cdevallmsg_t msg = (cdevallmsg_t)lmsg;
267 switch(msg->am_lmsg.ms_cmd) {
270 msg->am_open.msg.dev,
272 msg->am_open.devtype,
278 msg->am_close.msg.dev,
280 msg->am_close.devtype,
285 error = lwkt_forwardmsg(cn_fwd_port, &msg->am_lmsg);
292 cnopen(dev, flag, mode, td)
297 dev_t cndev, physdev;
300 if (cn_tab == NULL || cn_fwd_port == NULL)
302 cndev = cn_tab->cn_dev;
303 physdev = (major(dev) == major(cndev) ? dev : cndev);
305 * If mute is active, then non console opens don't get here
306 * so we don't need to check for that. They
307 * bypass this and go straight to the device.
310 retval = dev_port_dopen(cn_fwd_port, physdev, flag, mode, td);
313 * check if we openned it via /dev/console or
314 * via the physical entry (e.g. /dev/sio0).
318 else if (physdev == cndev) {
323 dev->si_tty = physdev->si_tty;
329 cnclose(dev, flag, mode, td)
337 if (cn_tab == NULL || cn_fwd_port == NULL)
339 cndev = cn_tab->cn_dev;
340 cn_tp = cndev->si_tty;
342 * act appropriatly depending on whether it's /dev/console
343 * or the pysical device (e.g. /dev/sio) that's being closed.
344 * in either case, don't actually close the device unless
348 /* the physical device is about to be closed */
352 /* perform a ttyhalfclose() */
353 /* reset session and proc group */
354 cn_tp->t_pgrp = NULL;
355 cn_tp->t_session = NULL;
359 } else if (major(dev) != major(cndev)) {
360 /* the logical console is about to be closed */
367 return (dev_port_dclose(cn_fwd_port, dev, flag, mode, td));
372 cnread(dev, uio, flag)
378 if (cn_tab == NULL || cn_fwd_port == NULL)
380 dev = cn_tab->cn_dev;
381 return (dev_port_dread(cn_fwd_port, dev, uio, flag));
385 cnwrite(dev, uio, flag)
391 if (cn_tab == NULL || cn_fwd_port == NULL) {
392 uio->uio_resid = 0; /* dump the data */
396 dev = constty->t_dev;
398 dev = cn_tab->cn_dev;
400 return (dev_port_dwrite(cn_fwd_port, dev, uio, flag));
404 cnioctl(dev, cmd, data, flag, td)
413 if (cn_tab == NULL || cn_fwd_port == NULL)
415 KKASSERT(td->td_proc != NULL);
417 * Superuser can always use this to wrest control of console
418 * output from the "virtual" console.
420 if (cmd == TIOCCONS && constty) {
427 dev = cn_tab->cn_dev;
428 return (dev_port_dioctl(cn_fwd_port, dev, cmd, data, flag, td));
432 cnpoll(dev, events, td)
437 if ((cn_tab == NULL) || cn_mute || cn_fwd_port == NULL)
440 dev = cn_tab->cn_dev;
442 return (dev_port_dpoll(cn_fwd_port, dev, events, td));
450 if ((cn_tab == NULL) || cn_mute || cn_fwd_port == NULL)
453 dev = cn_tab->cn_dev;
454 return (dev_port_dkqfilter(cn_fwd_port, dev, kn));
461 if ((cn_tab == NULL) || cn_mute)
463 c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
464 if (c == '\r') c = '\n'; /* console input is always ICRNL */
471 if ((cn_tab == NULL) || cn_mute)
473 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
482 if ((cn_tab == NULL) || cn_mute)
486 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
487 (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
489 if (console_pausing && !db_active && (c == '\n')) {
491 if (console_pausing && (c == '\n')) {
493 for(cp=console_pausestr; *cp != '\0'; cp++)
494 (*cn_tab->cn_putc)(cn_tab->cn_dev, *cp);
497 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
498 for(cp=console_pausestr; *cp != '\0'; cp++)
499 (*cn_tab->cn_putc)(cn_tab->cn_dev, ' ');
500 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
515 if (refcount == 0 && cn_tab->cn_dbctl != NULL)
516 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on);
522 cn_drvinit(void *unused)
525 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
529 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)