usr/src/sys/hp/dev/cons.c

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990, 1993
 *      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: Utah $Hdr: cons.c 1.7 92/01/21$
 *
 *      @(#)cons.c      8.3 (Berkeley) 1/9/95
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/conf.h>

#include <hp/dev/cons.h>

struct  tty *constty;           /* virtual console output device */
struct  consdev *cn_tab;        /* physical console device info */
struct  tty *cn_tty;            /* XXX: console tty struct for tprintf */

cninit()
{
        register struct consdev *cp;

        /*
         * 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, we can handle it
         */
        if ((cp = cn_tab) == NULL)
                return;
        /*
         * Turn on console
         */
        cn_tty = cp->cn_tp;
        (*cp->cn_init)(cp);
}

cnopen(dev, flag, mode, p)
        dev_t dev;
        int flag, mode;
        struct proc *p;
{
        if (cn_tab == NULL)
                return (0);
        dev = cn_tab->cn_dev;
        return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
}

cnclose(dev, flag, mode, p)
        dev_t dev;
        int flag, mode;
        struct proc *p;
{
        if (cn_tab == NULL)
                return (0);
        dev = cn_tab->cn_dev;
        return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
}

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));
}

cnwrite(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_write)(dev, uio, flag));
}

cnioctl(dev, cmd, data, flag, p)
        dev_t dev;
        u_long 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*/
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));
}

cngetc()
{
        if (cn_tab == NULL)
                return (0);
        return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
}

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');
        }
}