735 lines
15 KiB
C
735 lines
15 KiB
C
/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* Copyright (c) 1999 Michael Smith
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* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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*
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)cons.c 7.2 (Berkeley) 5/9/91
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_syscons.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/fcntl.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/msgbuf.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/reboot.h>
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#include <sys/sysctl.h>
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#include <sys/sbuf.h>
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#include <sys/tty.h>
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#include <sys/uio.h>
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#include <sys/vnode.h>
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#include <ddb/ddb.h>
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#include <machine/cpu.h>
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#include <machine/clock.h>
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static MALLOC_DEFINE(M_TTYCONS, "tty console", "tty console handling");
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struct cn_device {
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STAILQ_ENTRY(cn_device) cnd_next;
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struct consdev *cnd_cn;
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};
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#define CNDEVPATHMAX 32
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#define CNDEVTAB_SIZE 4
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static struct cn_device cn_devtab[CNDEVTAB_SIZE];
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static STAILQ_HEAD(, cn_device) cn_devlist =
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STAILQ_HEAD_INITIALIZER(cn_devlist);
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int cons_avail_mask = 0; /* Bit mask. Each registered low level console
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* which is currently unavailable for inpit
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* (i.e., if it is in graphics mode) will have
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* this bit cleared.
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*/
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static int cn_mute;
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static char *consbuf; /* buffer used by `consmsgbuf' */
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static struct callout conscallout; /* callout for outputting to constty */
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struct msgbuf consmsgbuf; /* message buffer for console tty */
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static u_char console_pausing; /* pause after each line during probe */
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static char *console_pausestr=
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"<pause; press any key to proceed to next line or '.' to end pause mode>";
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struct tty *constty; /* pointer to console "window" tty */
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static struct mtx cnputs_mtx; /* Mutex for cnputs(). */
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static int use_cnputs_mtx = 0; /* != 0 if cnputs_mtx locking reqd. */
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static void constty_timeout(void *arg);
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static struct consdev cons_consdev;
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DATA_SET(cons_set, cons_consdev);
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SET_DECLARE(cons_set, struct consdev);
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void
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cninit(void)
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{
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struct consdev *best_cn, *cn, **list;
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/*
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* Check if we should mute the console (for security reasons perhaps)
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* It can be changes dynamically using sysctl kern.consmute
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* once we are up and going.
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*
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*/
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cn_mute = ((boothowto & (RB_MUTE
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|RB_SINGLE
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|RB_VERBOSE
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|RB_ASKNAME)) == RB_MUTE);
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/*
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* Find the first console with the highest priority.
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*/
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best_cn = NULL;
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SET_FOREACH(list, cons_set) {
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cn = *list;
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cnremove(cn);
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/* Skip cons_consdev. */
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if (cn->cn_ops == NULL)
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continue;
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cn->cn_ops->cn_probe(cn);
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if (cn->cn_pri == CN_DEAD)
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continue;
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if (best_cn == NULL || cn->cn_pri > best_cn->cn_pri)
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best_cn = cn;
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if (boothowto & RB_MULTIPLE) {
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/*
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* Initialize console, and attach to it.
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*/
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cn->cn_ops->cn_init(cn);
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cnadd(cn);
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}
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}
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if (best_cn == NULL)
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return;
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if ((boothowto & RB_MULTIPLE) == 0) {
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best_cn->cn_ops->cn_init(best_cn);
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cnadd(best_cn);
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}
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if (boothowto & RB_PAUSE)
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console_pausing = 1;
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/*
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* Make the best console the preferred console.
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*/
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cnselect(best_cn);
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#ifdef EARLY_PRINTF
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/*
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* Release early console.
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*/
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early_putc = NULL;
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#endif
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}
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void
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cninit_finish()
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{
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console_pausing = 0;
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}
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/* add a new physical console to back the virtual console */
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int
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cnadd(struct consdev *cn)
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{
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struct cn_device *cnd;
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int i;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
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if (cnd->cnd_cn == cn)
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return (0);
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for (i = 0; i < CNDEVTAB_SIZE; i++) {
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cnd = &cn_devtab[i];
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if (cnd->cnd_cn == NULL)
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break;
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}
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if (cnd->cnd_cn != NULL)
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return (ENOMEM);
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cnd->cnd_cn = cn;
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if (cn->cn_name[0] == '\0') {
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/* XXX: it is unclear if/where this print might output */
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printf("WARNING: console at %p has no name\n", cn);
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}
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STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next);
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if (STAILQ_FIRST(&cn_devlist) == cnd)
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ttyconsdev_select(cnd->cnd_cn->cn_name);
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/* Add device to the active mask. */
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cnavailable(cn, (cn->cn_flags & CN_FLAG_NOAVAIL) == 0);
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return (0);
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}
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void
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cnremove(struct consdev *cn)
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{
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struct cn_device *cnd;
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int i;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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if (cnd->cnd_cn != cn)
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continue;
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if (STAILQ_FIRST(&cn_devlist) == cnd)
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ttyconsdev_select(NULL);
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STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
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cnd->cnd_cn = NULL;
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/* Remove this device from available mask. */
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for (i = 0; i < CNDEVTAB_SIZE; i++)
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if (cnd == &cn_devtab[i]) {
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cons_avail_mask &= ~(1 << i);
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break;
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}
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#if 0
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/*
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* XXX
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* syscons gets really confused if console resources are
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* freed after the system has initialized.
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*/
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if (cn->cn_term != NULL)
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cn->cn_ops->cn_term(cn);
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#endif
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return;
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}
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}
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void
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cnselect(struct consdev *cn)
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{
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struct cn_device *cnd;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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if (cnd->cnd_cn != cn)
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continue;
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if (cnd == STAILQ_FIRST(&cn_devlist))
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return;
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STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
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STAILQ_INSERT_HEAD(&cn_devlist, cnd, cnd_next);
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ttyconsdev_select(cnd->cnd_cn->cn_name);
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return;
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}
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}
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void
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cnavailable(struct consdev *cn, int available)
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{
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int i;
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for (i = 0; i < CNDEVTAB_SIZE; i++) {
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if (cn_devtab[i].cnd_cn == cn)
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break;
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}
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if (available) {
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if (i < CNDEVTAB_SIZE)
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cons_avail_mask |= (1 << i);
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cn->cn_flags &= ~CN_FLAG_NOAVAIL;
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} else {
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if (i < CNDEVTAB_SIZE)
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cons_avail_mask &= ~(1 << i);
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cn->cn_flags |= CN_FLAG_NOAVAIL;
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}
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}
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int
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cnunavailable(void)
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{
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return (cons_avail_mask == 0);
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}
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/*
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* sysctl_kern_console() provides output parseable in conscontrol(1).
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*/
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static int
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sysctl_kern_console(SYSCTL_HANDLER_ARGS)
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{
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struct cn_device *cnd;
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struct consdev *cp, **list;
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char *p;
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int delete, error;
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struct sbuf *sb;
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sb = sbuf_new(NULL, NULL, CNDEVPATHMAX * 2, SBUF_AUTOEXTEND |
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SBUF_INCLUDENUL);
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if (sb == NULL)
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return (ENOMEM);
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sbuf_clear(sb);
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
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sbuf_printf(sb, "%s,", cnd->cnd_cn->cn_name);
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sbuf_printf(sb, "/");
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SET_FOREACH(list, cons_set) {
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cp = *list;
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if (cp->cn_name[0] != '\0')
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sbuf_printf(sb, "%s,", cp->cn_name);
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}
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sbuf_finish(sb);
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error = sysctl_handle_string(oidp, sbuf_data(sb), sbuf_len(sb), req);
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if (error == 0 && req->newptr != NULL) {
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p = sbuf_data(sb);
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error = ENXIO;
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delete = 0;
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if (*p == '-') {
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delete = 1;
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p++;
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}
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SET_FOREACH(list, cons_set) {
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cp = *list;
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if (strcmp(p, cp->cn_name) != 0)
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continue;
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if (delete) {
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cnremove(cp);
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error = 0;
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} else {
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error = cnadd(cp);
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if (error == 0)
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cnselect(cp);
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}
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break;
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}
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}
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sbuf_delete(sb);
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, console, CTLTYPE_STRING|CTLFLAG_RW,
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0, 0, sysctl_kern_console, "A", "Console device control");
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/*
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* User has changed the state of the console muting.
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* This may require us to open or close the device in question.
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*/
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static int
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sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
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{
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int error;
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error = sysctl_handle_int(oidp, &cn_mute, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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return (error);
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}
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SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
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0, sizeof(cn_mute), sysctl_kern_consmute, "I",
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"State of the console muting");
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void
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cngrab()
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{
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struct cn_device *cnd;
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struct consdev *cn;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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cn = cnd->cnd_cn;
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if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))
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cn->cn_ops->cn_grab(cn);
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}
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}
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void
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cnungrab()
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{
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struct cn_device *cnd;
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struct consdev *cn;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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cn = cnd->cnd_cn;
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if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))
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cn->cn_ops->cn_ungrab(cn);
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}
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}
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/*
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* Low level console routines.
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*/
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int
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cngetc(void)
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{
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int c;
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if (cn_mute)
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return (-1);
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while ((c = cncheckc()) == -1)
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cpu_spinwait();
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if (c == '\r')
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c = '\n'; /* console input is always ICRNL */
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return (c);
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}
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int
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cncheckc(void)
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{
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struct cn_device *cnd;
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struct consdev *cn;
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int c;
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if (cn_mute)
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return (-1);
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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cn = cnd->cnd_cn;
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if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {
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c = cn->cn_ops->cn_getc(cn);
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if (c != -1)
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return (c);
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}
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}
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return (-1);
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}
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void
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cngets(char *cp, size_t size, int visible)
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{
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char *lp, *end;
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int c;
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cngrab();
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lp = cp;
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end = cp + size - 1;
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for (;;) {
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c = cngetc() & 0177;
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switch (c) {
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case '\n':
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case '\r':
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cnputc(c);
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*lp = '\0';
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cnungrab();
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return;
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case '\b':
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case '\177':
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if (lp > cp) {
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if (visible)
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cnputs("\b \b");
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lp--;
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}
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continue;
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case '\0':
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continue;
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default:
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if (lp < end) {
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switch (visible) {
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case GETS_NOECHO:
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break;
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case GETS_ECHOPASS:
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cnputc('*');
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break;
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default:
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cnputc(c);
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break;
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}
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*lp++ = c;
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}
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}
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}
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}
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void
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cnputc(int c)
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{
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struct cn_device *cnd;
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struct consdev *cn;
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char *cp;
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#ifdef EARLY_PRINTF
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if (early_putc != NULL) {
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if (c == '\n')
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early_putc('\r');
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early_putc(c);
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return;
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}
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#endif
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if (cn_mute || c == '\0')
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return;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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cn = cnd->cnd_cn;
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if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {
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if (c == '\n')
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cn->cn_ops->cn_putc(cn, '\r');
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cn->cn_ops->cn_putc(cn, c);
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}
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}
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if (console_pausing && c == '\n' && !kdb_active) {
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for (cp = console_pausestr; *cp != '\0'; cp++)
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cnputc(*cp);
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cngrab();
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if (cngetc() == '.')
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console_pausing = 0;
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cnungrab();
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cnputc('\r');
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for (cp = console_pausestr; *cp != '\0'; cp++)
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cnputc(' ');
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cnputc('\r');
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}
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}
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void
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cnputs(char *p)
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{
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int c;
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int unlock_reqd = 0;
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if (use_cnputs_mtx) {
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/*
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* NOTE: Debug prints and/or witness printouts in
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* console driver clients can cause the "cnputs_mtx"
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* mutex to recurse. Simply return if that happens.
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*/
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if (mtx_owned(&cnputs_mtx))
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return;
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mtx_lock_spin(&cnputs_mtx);
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unlock_reqd = 1;
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}
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while ((c = *p++) != '\0')
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cnputc(c);
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if (unlock_reqd)
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mtx_unlock_spin(&cnputs_mtx);
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}
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static int consmsgbuf_size = 8192;
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SYSCTL_INT(_kern, OID_AUTO, consmsgbuf_size, CTLFLAG_RW, &consmsgbuf_size, 0,
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"Console tty buffer size");
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/*
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* Redirect console output to a tty.
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*/
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void
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constty_set(struct tty *tp)
|
|
{
|
|
int size;
|
|
|
|
KASSERT(tp != NULL, ("constty_set: NULL tp"));
|
|
if (consbuf == NULL) {
|
|
size = consmsgbuf_size;
|
|
consbuf = malloc(size, M_TTYCONS, M_WAITOK);
|
|
msgbuf_init(&consmsgbuf, consbuf, size);
|
|
callout_init(&conscallout, 0);
|
|
}
|
|
constty = tp;
|
|
constty_timeout(NULL);
|
|
}
|
|
|
|
/*
|
|
* Disable console redirection to a tty.
|
|
*/
|
|
void
|
|
constty_clear(void)
|
|
{
|
|
int c;
|
|
|
|
constty = NULL;
|
|
if (consbuf == NULL)
|
|
return;
|
|
callout_stop(&conscallout);
|
|
while ((c = msgbuf_getchar(&consmsgbuf)) != -1)
|
|
cnputc(c);
|
|
free(consbuf, M_TTYCONS);
|
|
consbuf = NULL;
|
|
}
|
|
|
|
/* Times per second to check for pending console tty messages. */
|
|
static int constty_wakeups_per_second = 5;
|
|
SYSCTL_INT(_kern, OID_AUTO, constty_wakeups_per_second, CTLFLAG_RW,
|
|
&constty_wakeups_per_second, 0,
|
|
"Times per second to check for pending console tty messages");
|
|
|
|
static void
|
|
constty_timeout(void *arg)
|
|
{
|
|
int c;
|
|
|
|
if (constty != NULL) {
|
|
tty_lock(constty);
|
|
while ((c = msgbuf_getchar(&consmsgbuf)) != -1) {
|
|
if (tty_putchar(constty, c) < 0) {
|
|
tty_unlock(constty);
|
|
constty = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (constty != NULL)
|
|
tty_unlock(constty);
|
|
}
|
|
if (constty != NULL) {
|
|
callout_reset(&conscallout, hz / constty_wakeups_per_second,
|
|
constty_timeout, NULL);
|
|
} else {
|
|
/* Deallocate the constty buffer memory. */
|
|
constty_clear();
|
|
}
|
|
}
|
|
|
|
static void
|
|
cn_drvinit(void *unused)
|
|
{
|
|
|
|
mtx_init(&cnputs_mtx, "cnputs_mtx", NULL, MTX_SPIN | MTX_NOWITNESS);
|
|
use_cnputs_mtx = 1;
|
|
}
|
|
|
|
SYSINIT(cndev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, cn_drvinit, NULL);
|
|
|
|
/*
|
|
* Sysbeep(), if we have hardware for it
|
|
*/
|
|
|
|
#ifdef HAS_TIMER_SPKR
|
|
|
|
static int beeping;
|
|
static struct callout beeping_timer;
|
|
|
|
static void
|
|
sysbeepstop(void *chan)
|
|
{
|
|
|
|
timer_spkr_release();
|
|
beeping = 0;
|
|
}
|
|
|
|
int
|
|
sysbeep(int pitch, int period)
|
|
{
|
|
|
|
if (timer_spkr_acquire()) {
|
|
if (!beeping) {
|
|
/* Something else owns it. */
|
|
return (EBUSY);
|
|
}
|
|
}
|
|
timer_spkr_setfreq(pitch);
|
|
if (!beeping) {
|
|
beeping = period;
|
|
callout_reset(&beeping_timer, period, sysbeepstop, NULL);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
sysbeep_init(void *unused)
|
|
{
|
|
|
|
callout_init(&beeping_timer, 1);
|
|
}
|
|
SYSINIT(sysbeep, SI_SUB_SOFTINTR, SI_ORDER_ANY, sysbeep_init, NULL);
|
|
#else
|
|
|
|
/*
|
|
* No hardware, no sound
|
|
*/
|
|
|
|
int
|
|
sysbeep(int pitch __unused, int period __unused)
|
|
{
|
|
|
|
return (ENODEV);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Temporary support for sc(4) to vt(4) transition.
|
|
*/
|
|
static unsigned vty_prefer;
|
|
static char vty_name[16];
|
|
SYSCTL_STRING(_kern, OID_AUTO, vty, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, vty_name,
|
|
0, "Console vty driver");
|
|
|
|
int
|
|
vty_enabled(unsigned vty)
|
|
{
|
|
static unsigned vty_selected = 0;
|
|
|
|
if (vty_selected == 0) {
|
|
TUNABLE_STR_FETCH("kern.vty", vty_name, sizeof(vty_name));
|
|
do {
|
|
#if defined(DEV_SC)
|
|
if (strcmp(vty_name, "sc") == 0) {
|
|
vty_selected = VTY_SC;
|
|
break;
|
|
}
|
|
#endif
|
|
#if defined(DEV_VT)
|
|
if (strcmp(vty_name, "vt") == 0) {
|
|
vty_selected = VTY_VT;
|
|
break;
|
|
}
|
|
#endif
|
|
if (vty_prefer != 0) {
|
|
vty_selected = vty_prefer;
|
|
break;
|
|
}
|
|
#if defined(DEV_VT)
|
|
vty_selected = VTY_VT;
|
|
#elif defined(DEV_SC)
|
|
vty_selected = VTY_SC;
|
|
#endif
|
|
} while (0);
|
|
|
|
if (vty_selected == VTY_VT)
|
|
strcpy(vty_name, "vt");
|
|
else if (vty_selected == VTY_SC)
|
|
strcpy(vty_name, "sc");
|
|
}
|
|
return ((vty_selected & vty) != 0);
|
|
}
|
|
|
|
void
|
|
vty_set_preferred(unsigned vty)
|
|
{
|
|
|
|
vty_prefer = vty;
|
|
#if !defined(DEV_SC)
|
|
vty_prefer &= ~VTY_SC;
|
|
#endif
|
|
#if !defined(DEV_VT)
|
|
vty_prefer &= ~VTY_VT;
|
|
#endif
|
|
}
|
|
|