kernel reorg

[unix-history] / usr / src / sys / hp / dev / cons.c

/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1990 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.
*
* %sccs.include.redist.c%
*
* from: Utah $Hdr: cons.c 1.1 90/07/09$
*
*      @(#)cons.c      7.5 (Berkeley) %G%
*/

#include "sys/param.h"
#include "sys/user.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 "cons.h"

/* XXX - all this could be autoconfig()ed */
#include "ite.h"
#if NITE > 0
int itecnprobe(), itecninit(), itecngetc(), itecnputc();
#endif
#include "dca.h"
#if NDCA > 0
int dcacnprobe(), dcacninit(), dcacngetc(), dcacnputc();
#endif
#include "dcm.h"
#if NDCM > 0
int dcmcnprobe(), dcmcninit(), dcmcngetc(), dcmcnputc();
#endif

struct  consdev constab[] = {
#if NITE > 0
       { itecnprobe,   itecninit,      itecngetc,      itecnputc },
#endif
#if NDCA > 0
       { dcacnprobe,   dcacninit,      dcacngetc,      dcacnputc },
#endif
#if NDCM > 0
       { dcmcnprobe,   dcmcninit,      dcmcngetc,      dcmcnputc },
#endif
       { 0 },
};
/* end XXX */

struct  tty *constty = 0;       /* 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)
       dev_t dev;
{
       if (cn_tab == NULL)
               return(0);
       dev = cn_tab->cn_dev;
       return ((*cdevsw[major(dev)].d_open)(dev, flag));
}

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

cnread(dev, uio, flag)
       dev_t dev;
       struct uio *uio;
{
       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;
{
       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)
       dev_t dev;
       caddr_t data;
{
       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(u.u_cred, &u.u_acflag);
               if (error)
                       return (error);
               constty = NULL;
               return (0);
       }
       dev = cn_tab->cn_dev;
       return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag));
}

/*ARGSUSED*/
cnselect(dev, rw)
       dev_t dev;
       int rw;
{
       if (cn_tab == NULL)
               return(1);
       return(ttselect(cn_tab->cn_dev, rw));
}

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');
       }
}