4be2eb8c49
Made a new (inline) function devsw(dev_t dev) and substituted it. Changed to the BDEV variant to this format as well: bdevsw(dev_t dev) DEVFS will eventually benefit from this change too.
439 lines
10 KiB
C
439 lines
10 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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* $Id: cons.c,v 1.64 1999/04/28 10:52:04 dt Exp $
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*/
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#include "opt_devfs.h"
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#include <sys/param.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/uio.h>
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#include <machine/cpu.h>
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#include <machine/cons.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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#define CDEV_MAJOR 0
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static struct cdevsw cn_cdevsw = {
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cnopen, cnclose, cnread, cnwrite,
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cnioctl, nullstop, nullreset, nodevtotty,
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cnpoll, nommap, NULL, "console",
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NULL, -1, nodump, nopsize,
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D_TTY,
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};
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static dev_t cn_dev_t; /* seems to be never really used */
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SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
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&cn_dev_t, sizeof cn_dev_t, "T,dev_t", "");
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static int cn_mute;
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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 u_char cn_is_open; /* nonzero if logical console is open */
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static int openmode, openflag; /* how /dev/console was openned */
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static u_char cn_phys_is_open; /* nonzero if physical device is open */
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static d_close_t *cn_phys_close; /* physical device close function */
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static d_open_t *cn_phys_open; /* physical device open function */
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static struct consdev *cn_tab; /* physical console device info */
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static struct tty *cn_tp; /* physical console tty struct */
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#ifdef DEVFS
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static void *cn_devfs_token; /* represents the devfs entry */
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#endif /* DEVFS */
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CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL);
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void
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cninit()
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{
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struct consdev *best_cp, *cp;
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struct consdev **list;
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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_cp = NULL;
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list = (struct consdev **)cons_set.ls_items;
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while ((cp = *list++) != NULL) {
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if (cp->cn_probe == NULL)
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continue;
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(*cp->cn_probe)(cp);
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if (cp->cn_pri > CN_DEAD &&
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(best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
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best_cp = cp;
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}
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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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* If no console, give up.
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*/
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if (best_cp == NULL) {
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cn_tab = best_cp;
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return;
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}
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/*
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* Initialize console, then attach to it. This ordering allows
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* debugging using the previous console, if any.
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* XXX if there was a previous console, then its driver should
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* be informed when we forget about it.
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*/
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(*best_cp->cn_init)(best_cp);
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cn_tab = best_cp;
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}
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void
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cninit_finish()
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{
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struct cdevsw *cdp;
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if ((cn_tab == NULL) || cn_mute)
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return;
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/*
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* Hook the open and close functions.
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*/
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cdp = devsw(cn_tab->cn_dev);
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cn_phys_close = cdp->d_close;
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cdp->d_close = cnclose;
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cn_phys_open = cdp->d_open;
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cdp->d_open = cnopen;
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cn_tp = (*cdp->d_devtotty)(cn_tab->cn_dev);
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cn_dev_t = cn_tp->t_dev;
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}
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static void
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cnuninit(void)
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{
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struct cdevsw *cdp;
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if (cn_tab == NULL)
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return;
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/*
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* Unhook the open and close functions.
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*/
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cdp = devsw(cn_tab->cn_dev);
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cdp->d_close = cn_phys_close;
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cn_phys_close = NULL;
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cdp->d_open = cn_phys_open;
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cn_phys_open = NULL;
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cn_tp = NULL;
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cn_dev_t = 0;
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}
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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) && (cn_tab != NULL) && (req->newptr != NULL)) {
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if(ocn_mute && !cn_mute) {
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/*
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* going from muted to unmuted.. open the physical dev
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* if the console has been openned
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*/
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cninit_finish();
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if(cn_is_open)
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/* XXX curproc is not what we want really */
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error = cnopen(cn_dev_t, openflag,
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openmode, curproc);
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/* if it failed, back it out */
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if ( error != 0) cnuninit();
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} else if (!ocn_mute && cn_mute) {
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/*
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* going from unmuted to muted.. close the physical dev
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* if it's only open via /dev/console
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*/
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if(cn_is_open)
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error = cnclose(cn_dev_t, openflag,
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openmode, curproc);
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if ( error == 0) cnuninit();
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}
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if (error != 0) {
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/*
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* back out the change if there was an error
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*/
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cn_mute = ocn_mute;
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}
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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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cnopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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dev_t cndev, physdev;
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int retval = 0;
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if (cn_tab == NULL)
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return (0);
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cndev = cn_tab->cn_dev;
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physdev = (major(dev) == major(cndev) ? dev : cndev);
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/*
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* If mute is active, then non console opens don't get here
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* so we don't need to check for that. They
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* bypass this and go straight to the device.
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*/
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if(!cn_mute)
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retval = (*cn_phys_open)(physdev, flag, mode, p);
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if (retval == 0) {
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/*
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* check if we openned it via /dev/console or
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* via the physical entry (e.g. /dev/sio0).
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*/
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if (dev == cndev)
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cn_phys_is_open = 1;
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else if (physdev == cndev) {
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openmode = mode;
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openflag = flag;
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cn_is_open = 1;
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}
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}
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return (retval);
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}
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static int
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cnclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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dev_t cndev;
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if (cn_tab == NULL)
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return (0);
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cndev = cn_tab->cn_dev;
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/*
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* act appropriatly depending on whether it's /dev/console
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* or the pysical device (e.g. /dev/sio) that's being closed.
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* in either case, don't actually close the device unless
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* both are closed.
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*/
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if (dev == cndev) {
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/* the physical device is about to be closed */
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cn_phys_is_open = 0;
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if (cn_is_open) {
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if (cn_tp) {
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/* perform a ttyhalfclose() */
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/* reset session and proc group */
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cn_tp->t_pgrp = NULL;
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cn_tp->t_session = NULL;
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}
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return (0);
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}
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} else if (major(dev) != major(cndev)) {
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/* the logical console is about to be closed */
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cn_is_open = 0;
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if (cn_phys_is_open)
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return (0);
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dev = cndev;
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}
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if(cn_phys_close)
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return ((*cn_phys_close)(dev, flag, mode, p));
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return (0);
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}
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static int
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cnread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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if ((cn_tab == NULL) || cn_mute)
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return (0);
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dev = cn_tab->cn_dev;
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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, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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if ((cn_tab == NULL) || cn_mute) {
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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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if (constty)
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dev = constty->t_dev;
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else
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dev = cn_tab->cn_dev;
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return ((*devsw(dev)->d_write)(dev, uio, flag));
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}
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static int
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cnioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int error;
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if ((cn_tab == NULL) || cn_mute)
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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(p);
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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 = cn_tab->cn_dev;
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return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, p));
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}
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static int
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cnpoll(dev, events, p)
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dev_t dev;
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int events;
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struct proc *p;
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{
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if ((cn_tab == NULL) || cn_mute)
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return (1);
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dev = cn_tab->cn_dev;
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return ((*devsw(dev)->d_poll)(dev, events, p));
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}
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int
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cngetc()
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{
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int c;
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if ((cn_tab == NULL) || cn_mute)
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return (-1);
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c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
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if (c == '\r') 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()
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{
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if ((cn_tab == NULL) || cn_mute)
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return (-1);
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return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
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}
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void
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cnputc(c)
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register int c;
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{
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if ((cn_tab == NULL) || cn_mute)
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return;
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if (c) {
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if (c == '\n')
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(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
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(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
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}
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}
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static int cn_devsw_installed;
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static void
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cn_drvinit(void *unused)
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{
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dev_t dev;
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if( ! cn_devsw_installed ) {
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dev = makedev(CDEV_MAJOR,0);
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cdevsw_add(&dev,&cn_cdevsw,NULL);
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cn_devsw_installed = 1;
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#ifdef DEVFS
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cn_devfs_token = devfs_add_devswf(&cn_cdevsw, 0, DV_CHR,
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UID_ROOT, GID_WHEEL, 0600,
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"console");
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#endif
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}
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}
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SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)
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