1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
354 lines
8.3 KiB
C
354 lines
8.3 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 <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 <machine/cpu.h>
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#include <machine/cons.h>
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/* XXX this should be config(8)ed. */
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#include "sc.h"
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#include "vt.h"
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#include "sio.h"
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static struct consdev constab[] = {
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#if NSC > 0
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{ sccnprobe, sccninit, sccngetc, sccncheckc, sccnputc },
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#endif
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#if NVT > 0
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{ pccnprobe, pccninit, pccngetc, pccncheckc, pccnputc },
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#endif
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#if NSIO > 0
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{ siocnprobe, siocninit, siocngetc, siocncheckc, siocnputc },
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#endif
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{ 0 },
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};
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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_select_t cnselect;
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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, /*0*/
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cnioctl, nullstop, nullreset, nodevtotty,/* console */
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cnselect, nommap, NULL, "console", NULL, -1 };
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struct tty *constty = 0; /* virtual console output device */
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static dev_t cn_dev_t;
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SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLTYPE_OPAQUE|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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SYSCTL_INT(_kern, OID_AUTO, consmute, CTLFLAG_RW, &cn_mute, 0, "");
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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 u_char cn_phys_is_open; /* nonzero if physical console 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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void *cn_devfs_token; /* represents the devfs entry */
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#endif /* DEVFS */
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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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/*
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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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for (cp = constab; cp->cn_probe; cp++) {
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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)
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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 = cdevsw[major(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 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;
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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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retval = (*cn_phys_open)(physdev, flag, mode, p);
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if (retval == 0) {
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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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cn_is_open = 1;
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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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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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return ((*cn_phys_close)(dev, flag, mode, p));
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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 ((*cdevsw[major(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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return (0);
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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 ((*cdevsw[major(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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int 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->p_ucred, (u_short *) NULL);
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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 ((*cdevsw[major(dev)]->d_ioctl)(dev, cmd, data, flag, p));
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}
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static int
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cnselect(dev, rw, p)
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dev_t dev;
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int rw;
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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 ((*cdevsw[major(dev)]->d_select)(dev, rw, 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 cn_devsw_installed = 0;
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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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