freebsd-skq/sys/kern/tty_cons.c

276 lines
6.3 KiB
C

/*
* 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 1.20 1995/01/21 14:12:15 bde Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <machine/cons.h>
#include <machine/stdarg.h>
/* XXX - all this could be autoconfig()ed */
#include "sc.h"
#include "vt.h"
#if NSC > 0 || NVT > 0
int pccnprobe(), pccninit(), pccngetc(), pccncheckc(), pccnputc();
#endif
#include "sio.h"
#if NSIO > 0
int siocnprobe(), siocninit(), siocngetc(), siocncheckc(), siocnputc();
#endif
static struct consdev constab[] = {
#if NSC > 0 || NVT > 0
{ pccnprobe, pccninit, pccngetc, pccncheckc, pccnputc },
#endif
#if NSIO > 0
{ siocnprobe, siocninit, siocngetc, siocncheckc, siocnputc },
#endif
{ 0 },
};
/* end XXX */
struct tty *constty = 0; /* virtual console output device */
struct tty *cn_tty; /* XXX: console tty struct for tprintf */
/* XXX */
typedef u_char bool_t;
static bool_t cn_is_open; /* nonzero if logical console is open */
static bool_t cn_phys_is_open; /* nonzero if physical console 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 */
void
cninit()
{
register struct consdev *cp;
struct cdevsw *cdp;
/*
* Collect information about all possible consoles
* and find the one with highest priority
*/
for (cp = constab; cp->cn_probe; cp++) {
(*cp->cn_probe)(cp);
if (cp->cn_pri > CN_DEAD &&
(cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
cn_tab = cp;
}
/*
* No console, give up.
*/
if ((cp = cn_tab) == NULL)
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;
/*
* Turn on console
*/
cn_tty = cp->cn_tp;
(*cp->cn_init)(cp);
}
int
cnopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
dev_t cndev, physdev;
int retval;
if (cn_tab == NULL)
return (0);
cndev = cn_tab->cn_dev;
physdev = (major(dev) == major(cndev) ? dev : cndev);
retval = (*cn_phys_open)(physdev, flag, mode, p);
if (retval == 0) {
if (dev == cndev)
cn_phys_is_open = 1;
else if (physdev == cndev)
cn_is_open = 1;
}
return (retval);
}
int
cnclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
dev_t cndev;
if (cn_tab == NULL)
return (0);
cndev = cn_tab->cn_dev;
if (dev == cndev) {
cn_phys_is_open = 0;
if (cn_is_open)
return (0);
} else if (major(dev) != major(cndev)) {
cn_is_open = 0;
if (cn_phys_is_open)
return (0);
dev = cndev;
}
return ((*cn_phys_close)(dev, flag, mode, p));
}
int
cnread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
if (cn_tab == NULL)
return (0);
dev = cn_tab->cn_dev;
return ((*cdevsw[major(dev)].d_read)(dev, uio, flag));
}
int
cnwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
if (cn_tab == NULL)
return (0);
if (constty)
dev = constty->t_dev;
else
dev = cn_tab->cn_dev;
return ((*cdevsw[major(dev)].d_write)(dev, uio, flag));
}
int
cnioctl(dev, cmd, data, flag, p)
dev_t dev;
int cmd;
caddr_t data;
int flag;
struct proc *p;
{
int error;
if (cn_tab == NULL)
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));
}
/*ARGSUSED*/
int
cnselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
{
if (cn_tab == NULL)
return (1);
return (ttselect(cn_tab->cn_dev, rw, p));
}
int
cngetc()
{
int c;
if (cn_tab == NULL)
return (0);
c = (*cn_tab->cn_getc)(cn_tab->cn_dev);
if (c == '\r') c = '\n'; /* console input is always ICRNL */
return (c);
}
int
cncheckc()
{
if (cn_tab == NULL)
return (0);
return ((*cn_tab->cn_checkc)(cn_tab->cn_dev));
}
void
cnputc(c)
register int c;
{
if (cn_tab == NULL)
return;
if (c) {
(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
if (c == '\n')
(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
}
}
int
pg(const char *p, ...) {
va_list args;
va_start(args, p);
printf("%r\n>", p, args);
return(cngetc());
}