freebsd-dev/sys/kern/tty_cons.c

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/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)cons.c 7.2 (Berkeley) 5/9/91
* $Id: cons.c,v 1.59 1998/08/23 08:26:40 bde Exp $
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*/
#include "opt_devfs.h"
#include <sys/param.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
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#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/uio.h>
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#include <machine/cpu.h>
#include <machine/cons.h>
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/* XXX this should be config(8)ed. */
#include "sc.h"
#include "vt.h"
#include "sio.h"
static struct consdev constab[] = {
Make pcvt and syscons live in the same kernel. If both are enabled, then the first one in the config has priority. They can be switched using userconfig(). i386/i386/conf.c: Initialize the shared syscons/pcvt cdevsw entry to `nx'. Add cdevsw registration functions. Use devsw functions of the correct type if they exist. i386/i386/cons.c: Add renamed syscons entry points to constab. i386/i386/cons.h: Declare the renamed syscons entry points. i386/i386/machdep.c: Repeat console initialization after userconfig() in case the current console has become wrong. This depends on cn functions not wiring down anything important. sys/conf.h: Declare new functions. i386/isa/isa.[ch]: Add a function to decide which display driver has priority. Should be done better. i386/isa/syscons.c: Rename pccn* -> sccn*. Initialize CRTC start address in case the previous driver has moved it. i386/isa/syscons.c, i386/isa/pcvt/* Initialize the bogusly shared variable Crtat dynamically in case the stored value was changed by the previous driver. Initialize cdevsw table from a template. Don't grab the console if another display driver has priority. i386/isa/syscons.h, i386/isa/pcvt/pcvt_hdr.h: Don't externally declare now-static cdevsw functions. i386/isa/pcvt/pcvt_hdr.h: Set the sensitive hardware flag so that pcvt doesn't always have lower priority than syscons. This also fixes the "stupid" detection of the display after filling the display with text. i386/isa/pcvt/pcvt_out.c: Don't be confused the off-screen cursor offset 0xffff set by syscons. kern/subr_xxx.c: Add enough nxio/nodev/null devsw functions of the correct type for syscons and pcvt.
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#if NSC > 0
{ sccnprobe, sccninit, sccngetc, sccncheckc, sccnputc },
#endif
#if NVT > 0
{ pccnprobe, pccninit, pccngetc, pccncheckc, pccnputc },
#endif
#if NSIO > 0
{ siocnprobe, siocninit, siocngetc, siocncheckc, siocnputc },
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#endif
{ 0 },
};
static d_open_t cnopen;
static d_close_t cnclose;
static d_read_t cnread;
static d_write_t cnwrite;
static d_ioctl_t cnioctl;
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static d_poll_t cnpoll;
#define CDEV_MAJOR 0
static struct cdevsw cn_cdevsw = {
cnopen, cnclose, cnread, cnwrite,
cnioctl, nullstop, nullreset, nodevtotty,
cnpoll, nommap, NULL, "console",
NULL, -1, nodump, nopsize,
D_TTY,
};
static dev_t cn_dev_t; /* seems to be never really used */
SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
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&cn_dev_t, sizeof cn_dev_t, "T,dev_t", "");
static int cn_mute;
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int cons_unavail = 0; /* XXX:
* physical console not available for
* input (i.e., it is in graphics mode)
*/
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static u_char cn_is_open; /* nonzero if logical console is open */
static int openmode, openflag; /* how /dev/console was openned */
static u_char cn_phys_is_open; /* nonzero if physical device is open */
static d_close_t *cn_phys_close; /* physical device close function */
static d_open_t *cn_phys_open; /* physical device open function */
static struct consdev *cn_tab; /* physical console device info */
static struct tty *cn_tp; /* physical console tty struct */
#ifdef DEVFS
static void *cn_devfs_token; /* represents the devfs entry */
#endif /* DEVFS */
void
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cninit()
{
struct consdev *best_cp, *cp;
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/*
* Find the first console with the highest priority.
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*/
best_cp = NULL;
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for (cp = constab; cp->cn_probe; cp++) {
(*cp->cn_probe)(cp);
if (cp->cn_pri > CN_DEAD &&
(best_cp == NULL || cp->cn_pri > best_cp->cn_pri))
best_cp = cp;
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}
/*
* Check if we should mute the console (for security reasons perhaps)
* It can be changes dynamically using sysctl kern.consmute
* once we are up and going.
*
*/
cn_mute = ((boothowto & (RB_MUTE
|RB_SINGLE
|RB_VERBOSE
|RB_ASKNAME
|RB_CONFIG)) == RB_MUTE);
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/*
* If no console, give up.
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*/
if (best_cp == NULL) {
cn_tab = best_cp;
return;
}
/*
* Initialize console, then attach to it. This ordering allows
* debugging using the previous console, if any.
* XXX if there was a previous console, then its driver should
* be informed when we forget about it.
*/
(*best_cp->cn_init)(best_cp);
cn_tab = best_cp;
}
void
cninit_finish()
{
struct cdevsw *cdp;
if ((cn_tab == NULL) || cn_mute)
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return;
/*
* Hook the open and close functions.
*/
cdp = cdevsw[major(cn_tab->cn_dev)];
cn_phys_close = cdp->d_close;
cdp->d_close = cnclose;
cn_phys_open = cdp->d_open;
cdp->d_open = cnopen;
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
cnuninit(void)
{
struct cdevsw *cdp;
if (cn_tab == NULL)
return;
/*
* Unhook the open and close functions.
*/
cdp = cdevsw[major(cn_tab->cn_dev)];
cdp->d_close = cn_phys_close;
cn_phys_close = NULL;
cdp->d_open = cn_phys_open;
cn_phys_open = NULL;
cn_tp = NULL;
cn_dev_t = 0;
}
/*
* User has changed the state of the console muting.
* This may require us to open or close the device in question.
*/
static int
sysctl_kern_consmute SYSCTL_HANDLER_ARGS
{
int error;
int ocn_mute;
ocn_mute = cn_mute;
error = sysctl_handle_int(oidp, &cn_mute, 0, req);
if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) {
if(ocn_mute && !cn_mute) {
/*
* going from muted to unmuted.. open the physical dev
* if the console has been openned
*/
cninit_finish();
if(cn_is_open)
/* XXX curproc is not what we want really */
error = cnopen(cn_dev_t, openflag,
openmode, curproc);
/* if it failed, back it out */
if ( error != 0) cnuninit();
} else if (!ocn_mute && cn_mute) {
/*
* going from unmuted to muted.. close the physical dev
* if it's only open via /dev/console
*/
if(cn_is_open)
error = cnclose(cn_dev_t, openflag,
openmode, curproc);
if ( error == 0) cnuninit();
}
if (error != 0) {
/*
* back out the change if there was an error
*/
cn_mute = ocn_mute;
}
}
return (error);
}
SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
0, sizeof cn_mute, sysctl_kern_consmute, "I", "");
static int
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cnopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
dev_t cndev, physdev;
int retval = 0;
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if (cn_tab == NULL)
return (0);
cndev = cn_tab->cn_dev;
physdev = (major(dev) == major(cndev) ? dev : cndev);
/*
* If mute is active, then non console opens don't get here
* so we don't need to check for that. They
* bypass this and go straight to the device.
*/
if(!cn_mute)
retval = (*cn_phys_open)(physdev, flag, mode, p);
if (retval == 0) {
/*
* check if we openned it via /dev/console or
* via the physical entry (e.g. /dev/sio0).
*/
if (dev == cndev)
cn_phys_is_open = 1;
else if (physdev == cndev) {
openmode = mode;
openflag = flag;
cn_is_open = 1;
}
}
return (retval);
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}
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static int
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cnclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
dev_t cndev;
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if (cn_tab == NULL)
return (0);
cndev = cn_tab->cn_dev;
/*
* act appropriatly depending on whether it's /dev/console
* or the pysical device (e.g. /dev/sio) that's being closed.
* in either case, don't actually close the device unless
* both are closed.
*/
if (dev == cndev) {
/* the physical device is about to be closed */
cn_phys_is_open = 0;
if (cn_is_open) {
if (cn_tp) {
/* perform a ttyhalfclose() */
/* reset session and proc group */
cn_tp->t_pgrp = NULL;
cn_tp->t_session = NULL;
}
return (0);
}
} else if (major(dev) != major(cndev)) {
/* the logical console is about to be closed */
cn_is_open = 0;
if (cn_phys_is_open)
return (0);
dev = cndev;
}
if(cn_phys_close)
return ((*cn_phys_close)(dev, flag, mode, p));
return (0);
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}
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static int
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cnread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
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{
if ((cn_tab == NULL) || cn_mute)
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return (0);
dev = cn_tab->cn_dev;
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)
dev_t dev;
struct uio *uio;
int flag;
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{
if ((cn_tab == NULL) || cn_mute) {
uio->uio_resid = 0; /* dump the data */
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return (0);
}
if (constty)
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dev = constty->t_dev;
else
dev = cn_tab->cn_dev;
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)
dev_t dev;
u_long cmd;
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caddr_t data;
int flag;
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struct proc *p;
{
int error;
if ((cn_tab == NULL) || cn_mute)
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return (0);
/*
* Superuser can always use this to wrest control of console
* output from the "virtual" console.
*/
if (cmd == TIOCCONS && constty) {
error = suser(p->p_ucred, (u_short *) NULL);
if (error)
return (error);
constty = NULL;
return (0);
}
dev = cn_tab->cn_dev;
return ((*cdevsw[major(dev)]->d_ioctl)(dev, cmd, data, flag, p));
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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;
{
if ((cn_tab == NULL) || cn_mute)
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return (1);
dev = cn_tab->cn_dev;
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return ((*cdevsw[major(dev)]->d_poll)(dev, events, p));
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}
int
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cngetc()
{
int c;
if ((cn_tab == NULL) || cn_mute)
return (-1);
c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
if (c == '\r') c = '\n'; /* console input is always ICRNL */
return (c);
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}
int
cncheckc()
{
if ((cn_tab == NULL) || cn_mute)
return (-1);
return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
}
void
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cnputc(c)
register int c;
{
if ((cn_tab == NULL) || cn_mute)
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return;
if (c) {
if (c == '\n')
(*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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}
}
static cn_devsw_installed = 0;
static void
cn_drvinit(void *unused)
{
dev_t dev;
if( ! cn_devsw_installed ) {
dev = makedev(CDEV_MAJOR,0);
cdevsw_add(&dev,&cn_cdevsw,NULL);
cn_devsw_installed = 1;
#ifdef DEVFS
cn_devfs_token = devfs_add_devswf(&cn_cdevsw, 0, DV_CHR,
UID_ROOT, GID_WHEEL, 0600,
"console");
#endif
}
}
SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)