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
44 #include <sys/param.h>
45 #include <sys/systm.h>
48 #include <sys/fcntl.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/namei.h>
53 #include <sys/queue.h>
54 #include <sys/reboot.h>
55 #include <sys/sysctl.h>
58 #include <sys/vnode.h>
62 #include <machine/cpu.h>
64 static d_open_t cnopen;
65 static d_close_t cnclose;
66 static d_read_t cnread;
67 static d_write_t cnwrite;
68 static d_ioctl_t cnioctl;
69 static d_poll_t cnpoll;
70 static d_kqfilter_t cnkqfilter;
73 static struct cdevsw cn_cdevsw = {
81 /* strategy */ nostrategy,
86 /* flags */ D_TTY | D_KQFILTER,
87 /* kqfilter */ cnkqfilter,
91 STAILQ_ENTRY(cn_device) cnd_next;
94 struct consdev *cnd_cn;
97 #define CNDEVPATHMAX 32
98 #define CNDEVTAB_SIZE 4
99 static struct cn_device cn_devtab[CNDEVTAB_SIZE];
100 static STAILQ_HEAD(, cn_device) cn_devlist =
101 STAILQ_HEAD_INITIALIZER(cn_devlist);
103 #define CND_INVALID(cnd, td) \
104 (cnd == NULL || cnd->cnd_vp == NULL || \
105 (cnd->cnd_vp->v_type == VBAD && !cn_devopen(cnd, td, 1)))
107 static udev_t cn_udev_t;
108 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
109 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
111 int cons_unavail = 0; /* XXX:
112 * physical console not available for
113 * input (i.e., it is in graphics mode)
116 static int openflag; /* how /dev/console was opened */
117 static int cn_is_open;
118 static dev_t cn_devfsdev; /* represents the device private info */
119 static u_char console_pausing; /* pause after each line during probe */
120 static char *console_pausestr=
121 "<pause; press any key to proceed to next line or '.' to end pause mode>";
123 void cndebug(char *);
125 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
126 SET_DECLARE(cons_set, struct consdev);
131 struct consdev *best_cn, *cn, **list;
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 * Find the first console with the highest priority.
149 SET_FOREACH(list, cons_set) {
152 if (cn->cn_probe == NULL)
155 if (cn->cn_pri == CN_DEAD)
157 if (best_cn == NULL || cn->cn_pri > best_cn->cn_pri)
159 if (boothowto & RB_MULTIPLE) {
161 * Initialize console, and attach to it.
169 if ((boothowto & RB_MULTIPLE) == 0) {
171 best_cn->cn_init(best_cn);
173 if (boothowto & RB_PAUSE)
176 * Make the best console the preferred console.
187 /* add a new physical console to back the virtual console */
189 cnadd(struct consdev *cn)
191 struct cn_device *cnd;
194 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
195 if (cnd->cnd_cn == cn)
197 for (i = 0; i < CNDEVTAB_SIZE; i++) {
199 if (cnd->cnd_cn == NULL)
202 if (cnd->cnd_cn != NULL)
205 STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next);
210 cnremove(struct consdev *cn)
212 struct cn_device *cnd;
214 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
215 if (cnd->cnd_cn != cn)
217 STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
218 if (cnd->cnd_vp != NULL)
219 vn_close(cnd->cnd_vp, openflag, NOCRED, NULL);
222 cnd->cnd_name[0] = '\0';
226 * syscons gets really confused if console resources are
227 * freed after the system has initialized.
229 if (cn->cn_term != NULL)
237 cnselect(struct consdev *cn)
239 struct cn_device *cnd;
241 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
242 if (cnd->cnd_cn != cn)
244 if (cnd == STAILQ_FIRST(&cn_devlist))
246 STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
247 STAILQ_INSERT_HEAD(&cn_devlist, cnd, cnd_next);
258 cnputc('>'); cnputc('>'); cnputc('>'); cnputc(' ');
259 for (i = 0; i < len; i++)
265 sysctl_kern_console(SYSCTL_HANDLER_ARGS)
267 struct cn_device *cnd;
268 struct consdev *cp, **list;
270 int delete, len, error;
273 SET_FOREACH(list, cons_set) {
275 if (cp->cn_dev != NULL)
276 len += strlen(devtoname(cp->cn_dev)) + 1;
278 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
279 len += strlen(devtoname(cnd->cnd_cn->cn_dev)) + 1;
280 len = len > CNDEVPATHMAX ? len : CNDEVPATHMAX;
281 MALLOC(name, char *, len, M_TEMP, M_WAITOK | M_ZERO);
283 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
284 p += sprintf(p, "%s,", devtoname(cnd->cnd_cn->cn_dev));
286 SET_FOREACH(list, cons_set) {
288 if (cp->cn_dev != NULL)
289 p += sprintf(p, "%s,", devtoname(cp->cn_dev));
291 error = sysctl_handle_string(oidp, name, len, req);
292 if (error == 0 && req->newptr != NULL) {
300 SET_FOREACH(list, cons_set) {
302 if (cp->cn_dev == NULL ||
303 strcmp(p, devtoname(cp->cn_dev)) != 0)
320 SYSCTL_PROC(_kern, OID_AUTO, console, CTLTYPE_STRING|CTLFLAG_RW,
321 0, 0, sysctl_kern_console, "A", "Console device control");
324 * User has changed the state of the console muting.
325 * This may require us to open or close the device in question.
328 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
334 error = sysctl_handle_int(oidp, &cn_mute, 0, req);
335 if (error != 0 || req->newptr == NULL)
337 if (ocn_mute && !cn_mute && cn_is_open)
338 error = cnopen(NODEV, openflag, 0, curthread);
339 else if (!ocn_mute && cn_mute && cn_is_open) {
340 error = cnclose(NODEV, openflag, 0, curthread);
341 cn_is_open = 1; /* XXX hack */
346 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
347 0, sizeof(cn_mute), sysctl_kern_consmute, "I", "");
350 cn_devopen(struct cn_device *cnd, struct thread *td, int forceopen)
352 char path[CNDEVPATHMAX];
358 if ((vp = cnd->cnd_vp) != NULL) {
359 if (!forceopen && vp->v_type != VBAD) {
361 return ((*devsw(dev)->d_open)(dev, openflag, 0, td));
364 vn_close(vp, openflag, td->td_ucred, td);
366 if (cnd->cnd_name[0] == '\0') {
367 strlcpy(cnd->cnd_name, devtoname(cnd->cnd_cn->cn_dev),
368 sizeof(cnd->cnd_name));
370 snprintf(path, sizeof(path), "/dev/%s", cnd->cnd_name);
371 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td);
372 error = vn_open(&nd, &openflag, 0);
374 NDFREE(&nd, NDF_ONLY_PNBUF);
375 VOP_UNLOCK(nd.ni_vp, 0, td);
376 if (nd.ni_vp->v_type == VCHR)
377 cnd->cnd_vp = nd.ni_vp;
379 vn_close(nd.ni_vp, openflag, td->td_ucred, td);
381 return (cnd->cnd_vp != NULL);
385 cnopen(dev_t dev, int flag, int mode, struct thread *td)
387 struct cn_device *cnd;
389 openflag = flag | FWRITE; /* XXX */
390 cn_is_open = 1; /* console is logically open */
393 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
394 cn_devopen(cnd, td, 0);
399 cnclose(dev_t dev, int flag, int mode, struct thread *td)
401 struct cn_device *cnd;
404 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
405 if ((vp = cnd->cnd_vp) == NULL)
408 vn_close(vp, openflag, td->td_ucred, td);
415 cnread(dev_t dev, struct uio *uio, int flag)
417 struct cn_device *cnd;
419 cnd = STAILQ_FIRST(&cn_devlist);
420 if (cn_mute || CND_INVALID(cnd, curthread))
422 dev = cnd->cnd_vp->v_rdev;
423 return ((*devsw(dev)->d_read)(dev, uio, flag));
427 cnwrite(dev_t dev, struct uio *uio, int flag)
429 struct cn_device *cnd;
431 cnd = STAILQ_FIRST(&cn_devlist);
432 if (cn_mute || CND_INVALID(cnd, curthread))
435 dev = constty->t_dev;
437 dev = cnd->cnd_vp->v_rdev;
440 return ((*devsw(dev)->d_write)(dev, uio, flag));
443 uio->uio_resid = 0; /* dump the data */
448 cnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
450 struct cn_device *cnd;
453 cnd = STAILQ_FIRST(&cn_devlist);
454 if (cn_mute || CND_INVALID(cnd, td))
457 * Superuser can always use this to wrest control of console
458 * output from the "virtual" console.
460 if (cmd == TIOCCONS && constty) {
467 dev = cnd->cnd_vp->v_rdev;
469 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, td));
475 * poll/kqfilter do not appear to be correct
478 cnpoll(dev_t dev, int events, struct thread *td)
480 struct cn_device *cnd;
482 cnd = STAILQ_FIRST(&cn_devlist);
483 if (cn_mute || CND_INVALID(cnd, td))
485 dev = cnd->cnd_vp->v_rdev;
487 return ((*devsw(dev)->d_poll)(dev, events, td));
492 cnkqfilter(dev_t dev, struct knote *kn)
494 struct cn_device *cnd;
496 cnd = STAILQ_FIRST(&cn_devlist);
497 if (cn_mute || CND_INVALID(cnd, curthread))
499 dev = cnd->cnd_vp->v_rdev;
501 return ((*devsw(dev)->d_kqfilter)(dev, kn));
506 * Low level console routines.
515 while ((c = cncheckc()) == -1)
518 c = '\n'; /* console input is always ICRNL */
525 struct cn_device *cnd;
531 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
533 c = cn->cn_checkc(cn->cn_dev);
544 struct cn_device *cnd;
548 if (cn_mute || c == '\0')
550 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
553 cn->cn_putc(cn->cn_dev, '\r');
554 cn->cn_putc(cn->cn_dev, c);
557 if (console_pausing && !db_active && (c == '\n')) {
559 if (console_pausing && (c == '\n')) {
561 for (cp = console_pausestr; *cp != '\0'; cp++)
566 for (cp = console_pausestr; *cp != '\0'; cp++)
575 struct cn_device *cnd;
582 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
584 if (cn->cn_dbctl != NULL)
585 cn->cn_dbctl(cn->cn_dev, on);
592 cn_drvinit(void *unused)
595 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
599 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)