598 lines
13 KiB
C
598 lines
13 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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $FreeBSD$
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.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/kernel.h>
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#include <sys/malloc.h>
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#include <sys/namei.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/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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static d_open_t cnopen;
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static d_close_t cnclose;
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static d_read_t cnread;
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static d_write_t cnwrite;
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static d_ioctl_t cnioctl;
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static d_poll_t cnpoll;
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static d_kqfilter_t cnkqfilter;
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static struct cdevsw cn_cdevsw = {
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.d_open = cnopen,
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.d_close = cnclose,
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.d_read = cnread,
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.d_write = cnwrite,
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.d_ioctl = cnioctl,
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.d_poll = cnpoll,
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.d_name = "console",
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.d_maj = 256,
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/*
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* XXX: We really want major #0, but zero here means
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* XXX: allocate a major number automatically.
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* XXX: kern_conf.c knows what to do when it sees 256.
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*/
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.d_flags = D_TTY,
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.d_kqfilter = cnkqfilter,
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};
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struct cn_device {
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STAILQ_ENTRY(cn_device) cnd_next;
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char cnd_name[16];
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struct vnode *cnd_vp;
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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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#define CND_INVALID(cnd, td) \
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(cnd == NULL || cnd->cnd_vp == NULL || \
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(cnd->cnd_vp->v_type == VBAD && !cn_devopen(cnd, td, 1)))
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static udev_t cn_udev_t;
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SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
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&cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
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int cons_unavail = 0; /* XXX:
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* physical console not available for
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* input (i.e., it is in graphics mode)
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*/
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static int cn_mute;
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static int openflag; /* how /dev/console was opened */
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static int cn_is_open;
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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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void cndebug(char *);
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CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
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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
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|RB_CONFIG)) == 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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if (cn->cn_probe == NULL)
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continue;
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cn->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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cnadd(cn);
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cn->cn_init(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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cnadd(best_cn);
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best_cn->cn_init(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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}
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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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STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next);
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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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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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STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
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if (cnd->cnd_vp != NULL)
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vn_close(cnd->cnd_vp, openflag, NOCRED, NULL);
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cnd->cnd_vp = NULL;
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cnd->cnd_cn = NULL;
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cnd->cnd_name[0] = '\0';
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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_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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return;
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}
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}
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void
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cndebug(char *str)
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{
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int i, len;
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len = strlen(str);
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cnputc('>'); cnputc('>'); cnputc('>'); cnputc(' ');
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for (i = 0; i < len; i++)
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cnputc(str[i]);
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cnputc('\n');
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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 *name, *p;
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int delete, len, error;
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len = 2;
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SET_FOREACH(list, cons_set) {
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cp = *list;
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if (cp->cn_dev != NULL)
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len += strlen(devtoname(cp->cn_dev)) + 1;
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}
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
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len += strlen(devtoname(cnd->cnd_cn->cn_dev)) + 1;
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len = len > CNDEVPATHMAX ? len : CNDEVPATHMAX;
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MALLOC(name, char *, len, M_TEMP, M_WAITOK | M_ZERO);
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p = name;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
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p += sprintf(p, "%s,", devtoname(cnd->cnd_cn->cn_dev));
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*p++ = '/';
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SET_FOREACH(list, cons_set) {
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cp = *list;
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if (cp->cn_dev != NULL)
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p += sprintf(p, "%s,", devtoname(cp->cn_dev));
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}
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error = sysctl_handle_string(oidp, name, len, req);
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if (error == 0 && req->newptr != NULL) {
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p = name;
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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 (cp->cn_dev == NULL ||
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strcmp(p, devtoname(cp->cn_dev)) != 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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FREE(name, M_TEMP);
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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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int ocn_mute;
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ocn_mute = cn_mute;
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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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if (ocn_mute && !cn_mute && cn_is_open)
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error = cnopen(NODEV, openflag, 0, curthread);
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else if (!ocn_mute && cn_mute && cn_is_open) {
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error = cnclose(NODEV, openflag, 0, curthread);
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cn_is_open = 1; /* XXX hack */
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}
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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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static int
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cn_devopen(struct cn_device *cnd, struct thread *td, int forceopen)
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{
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char path[CNDEVPATHMAX];
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struct nameidata nd;
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struct vnode *vp;
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dev_t dev;
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int error;
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if ((vp = cnd->cnd_vp) != NULL) {
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if (!forceopen && vp->v_type != VBAD) {
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dev = vp->v_rdev;
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return ((*devsw(dev)->d_open)(dev, openflag, 0, td));
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}
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cnd->cnd_vp = NULL;
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vn_close(vp, openflag, td->td_ucred, td);
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}
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if (cnd->cnd_name[0] == '\0') {
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strlcpy(cnd->cnd_name, devtoname(cnd->cnd_cn->cn_dev),
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sizeof(cnd->cnd_name));
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}
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snprintf(path, sizeof(path), "/dev/%s", cnd->cnd_name);
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td);
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error = vn_open(&nd, &openflag, 0);
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if (error == 0) {
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NDFREE(&nd, NDF_ONLY_PNBUF);
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VOP_UNLOCK(nd.ni_vp, 0, td);
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if (nd.ni_vp->v_type == VCHR)
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cnd->cnd_vp = nd.ni_vp;
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else
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vn_close(nd.ni_vp, openflag, td->td_ucred, td);
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}
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return (cnd->cnd_vp != NULL);
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}
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static int
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cnopen(dev_t dev, int flag, int mode, struct thread *td)
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{
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struct cn_device *cnd;
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openflag = flag | FWRITE; /* XXX */
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cn_is_open = 1; /* console is logically open */
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if (cn_mute)
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return (0);
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
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cn_devopen(cnd, td, 0);
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return (0);
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}
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static int
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cnclose(dev_t dev, int flag, int mode, struct thread *td)
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{
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struct cn_device *cnd;
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struct vnode *vp;
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STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
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if ((vp = cnd->cnd_vp) == NULL)
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continue;
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cnd->cnd_vp = NULL;
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vn_close(vp, openflag, td->td_ucred, td);
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}
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cn_is_open = 0;
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return (0);
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}
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static int
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cnread(dev_t dev, struct uio *uio, int flag)
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{
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struct cn_device *cnd;
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cnd = STAILQ_FIRST(&cn_devlist);
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if (cn_mute || CND_INVALID(cnd, curthread))
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return (0);
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dev = cnd->cnd_vp->v_rdev;
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return ((*devsw(dev)->d_read)(dev, uio, flag));
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}
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static int
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cnwrite(dev_t dev, struct uio *uio, int flag)
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{
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struct cn_device *cnd;
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cnd = STAILQ_FIRST(&cn_devlist);
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if (cn_mute || CND_INVALID(cnd, curthread))
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goto done;
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if (constty)
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dev = constty->t_dev;
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else
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dev = cnd->cnd_vp->v_rdev;
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if (dev != NULL) {
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log_console(uio);
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return ((*devsw(dev)->d_write)(dev, uio, flag));
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}
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done:
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uio->uio_resid = 0; /* dump the data */
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return (0);
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}
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static int
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cnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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{
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struct cn_device *cnd;
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int error;
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cnd = STAILQ_FIRST(&cn_devlist);
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if (cn_mute || CND_INVALID(cnd, td))
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return (0);
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/*
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* Superuser can always use this to wrest control of console
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* output from the "virtual" console.
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*/
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if (cmd == TIOCCONS && constty) {
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error = suser(td);
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if (error)
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return (error);
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constty = NULL;
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return (0);
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}
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dev = cnd->cnd_vp->v_rdev;
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if (dev != NULL)
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return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, td));
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return (0);
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}
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/*
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* XXX
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* poll/kqfilter do not appear to be correct
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*/
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static int
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cnpoll(dev_t dev, int events, struct thread *td)
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{
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struct cn_device *cnd;
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cnd = STAILQ_FIRST(&cn_devlist);
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if (cn_mute || CND_INVALID(cnd, td))
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return (0);
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dev = cnd->cnd_vp->v_rdev;
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if (dev != NULL)
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return ((*devsw(dev)->d_poll)(dev, events, td));
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return (0);
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}
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static int
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cnkqfilter(dev_t dev, struct knote *kn)
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{
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struct cn_device *cnd;
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cnd = STAILQ_FIRST(&cn_devlist);
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if (cn_mute || CND_INVALID(cnd, curthread))
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return (1);
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dev = cnd->cnd_vp->v_rdev;
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if (dev != NULL)
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return ((*devsw(dev)->d_kqfilter)(dev, kn));
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return (1);
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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);
|
|
while ((c = cncheckc()) == -1)
|
|
;
|
|
if (c == '\r')
|
|
c = '\n'; /* console input is always ICRNL */
|
|
return (c);
|
|
}
|
|
|
|
int
|
|
cncheckc(void)
|
|
{
|
|
struct cn_device *cnd;
|
|
struct consdev *cn;
|
|
int c;
|
|
|
|
if (cn_mute)
|
|
return (-1);
|
|
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
|
|
cn = cnd->cnd_cn;
|
|
c = cn->cn_checkc(cn);
|
|
if (c != -1) {
|
|
return (c);
|
|
}
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
cnputc(int c)
|
|
{
|
|
struct cn_device *cnd;
|
|
struct consdev *cn;
|
|
char *cp;
|
|
|
|
if (cn_mute || c == '\0')
|
|
return;
|
|
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
|
|
cn = cnd->cnd_cn;
|
|
if (c == '\n')
|
|
cn->cn_putc(cn, '\r');
|
|
cn->cn_putc(cn, c);
|
|
}
|
|
#ifdef DDB
|
|
if (console_pausing && !db_active && (c == '\n')) {
|
|
#else
|
|
if (console_pausing && (c == '\n')) {
|
|
#endif
|
|
for (cp = console_pausestr; *cp != '\0'; cp++)
|
|
cnputc(*cp);
|
|
if (cngetc() == '.')
|
|
console_pausing = 0;
|
|
cnputc('\r');
|
|
for (cp = console_pausestr; *cp != '\0'; cp++)
|
|
cnputc(' ');
|
|
cnputc('\r');
|
|
}
|
|
}
|
|
|
|
void
|
|
cndbctl(int on)
|
|
{
|
|
struct cn_device *cnd;
|
|
struct consdev *cn;
|
|
static int refcount;
|
|
|
|
if (!on)
|
|
refcount--;
|
|
if (refcount == 0)
|
|
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
|
|
cn = cnd->cnd_cn;
|
|
if (cn->cn_dbctl != NULL)
|
|
cn->cn_dbctl(cn, on);
|
|
}
|
|
if (on)
|
|
refcount++;
|
|
}
|
|
|
|
static void
|
|
cn_drvinit(void *unused)
|
|
{
|
|
|
|
make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "console");
|
|
}
|
|
|
|
SYSINIT(cndev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, cn_drvinit, NULL)
|