1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
87 static MALLOC_DEFINE(M_TTYCONS, "tty console", "tty console handling");
100 int	cons_avail_mask = 0;	/* Bit mask. Each registered low level console
108     "State of the console muting");
112 struct msgbuf consmsgbuf;		/* message buffer for console tty */
116 struct tty *constty;			/* pointer to console "window" tty */
130  * of kbd.c is contingent on any number of keyboard/console drivers being
146 		printf("-- Muting boot messages --\n");  in mute_console()
160 	 * Check if we should mute the console (for security reasons perhaps)  in cninit()
171 	 * Bring up the kbd layer just in time for cnprobe.  Console drivers  in cninit()
179 	 * Find the first console with the highest priority.  in cninit()
186 		if (cn->cn_ops == NULL)  in cninit()
188 		cn->cn_ops->cn_probe(cn);  in cninit()
189 		if (cn->cn_pri == CN_DEAD)  in cninit()
191 		if (best_cn == NULL || cn->cn_pri > best_cn->cn_pri)  in cninit()
195 			 * Initialize console, and attach to it.  in cninit()
197 			cn->cn_ops->cn_init(cn);  in cninit()
204 		best_cn->cn_ops->cn_init(best_cn);  in cninit()
210 	 * Make the best console the preferred console.  in cninit()
216 	 * Release early console.  in cninit()
229 /* add a new physical console to back the virtual console */
237 		if (cnd->cnd_cn == cn)  in cnadd()
241 		if (cnd->cnd_cn == NULL)  in cnadd()
244 	if (cnd->cnd_cn != NULL)  in cnadd()
246 	cnd->cnd_cn = cn;  in cnadd()
247 	if (cn->cn_name[0] == '\0') {  in cnadd()
249 		printf("WARNING: console at %p has no name\n", cn);  in cnadd()
253 		ttyconsdev_select(cnd->cnd_cn->cn_name);  in cnadd()
256 	cnavailable(cn, (cn->cn_flags & CN_FLAG_NOAVAIL) == 0);  in cnadd()
268 		if (cnd->cnd_cn != cn)  in cnremove()
273 		cnd->cnd_cn = NULL;  in cnremove()
284 		 * syscons gets really confused if console resources are  in cnremove()
287 		if (cn->cn_term != NULL)  in cnremove()
288 			cn->cn_ops->cn_term(cn);  in cnremove()
300 		if (cnd->cnd_cn != cn)  in cnselect()
306 		ttyconsdev_select(cnd->cnd_cn->cn_name);  in cnselect()
323 		cn->cn_flags &= ~CN_FLAG_NOAVAIL;  in cnavailable()
327 		cn->cn_flags |= CN_FLAG_NOAVAIL;  in cnavailable()
357 		sbuf_printf(sb, "%s,", cnd->cnd_cn->cn_name);  in sysctl_kern_console()
361 		if (cp->cn_name[0] != '\0')  in sysctl_kern_console()
362 			sbuf_printf(sb, "%s,", cp->cn_name);  in sysctl_kern_console()
366 	if (error == 0 && req->newptr != NULL) {  in sysctl_kern_console()
370 		if (*p == '-') {  in sysctl_kern_console()
376 			if (strcmp(p, cp->cn_name) != 0)  in sysctl_kern_console()
393 SYSCTL_PROC(_kern, OID_AUTO, console,
396     "Console device control");
405 		cn = cnd->cnd_cn;  in cngrab()
406 		if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))  in cngrab()
407 			cn->cn_ops->cn_grab(cn);  in cngrab()
418 		cn = cnd->cnd_cn;  in cnungrab()
419 		if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))  in cnungrab()
420 			cn->cn_ops->cn_ungrab(cn);  in cnungrab()
431 		cn = cnd->cnd_cn;  in cnresume()
432 		if (cn->cn_ops->cn_resume != NULL)  in cnresume()
433 			cn->cn_ops->cn_resume(cn);  in cnresume()
438  * Low level console routines.
446 		return (-1);  in cngetc()
447 	while ((c = cncheckc()) == -1)  in cngetc()
450 		c = '\n';		/* console input is always ICRNL */  in cngetc()
462 		return (-1);  in cncheckc()
464 		cn = cnd->cnd_cn;  in cncheckc()
465 		if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {  in cncheckc()
466 			c = cn->cn_ops->cn_getc(cn);  in cncheckc()
467 			if (c != -1)  in cncheckc()
471 	return (-1);  in cncheckc()
483 	end = cp + size - 1;  in cngets()
498 				lp--;  in cngets()
541 		cn = cnd->cnd_cn;  in cnputc()
542 		if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {  in cnputc()
544 				cn->cn_ops->cn_putc(cn, '\r');  in cnputc()
545 			cn->cn_ops->cn_putc(cn, c);  in cnputc()
571 		 * console driver clients can cause the "cnputs_mtx"  in cnputsn()
595     0, "Console tty buffer size");
598  * Redirect console output to a tty.
637  * Disable console redirection to a tty.
651 	while ((c = msgbuf_getchar(&consmsgbuf)) != -1)  in constty_clear()
657 /* Times per second to check for pending console tty messages. */
661     "Times per second to check for pending console tty messages");
670 	while ((c = msgbuf_getchar(&consmsgbuf)) != -1) {  in constty_timeout()
743     0, "Console vty driver");