last minute changes for passing proc ptr

[unix-history] / usr / src / sys / i386 / i386 / cons.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.
*
* %sccs.include.redist.c%
*
*      @(#)cons.c      7.2 (Berkeley) %G%
*/


#include "sys/param.h"
#include "sys/proc.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 */
int pccnprobe(), pccninit(), pccngetc(), pccnputc();
#include "com.h"
#if NCOM > 0
int comcnprobe(), comcninit(), comcngetc(), comcnputc();
#endif

struct  consdev constab[] = {
       { pccnprobe,    pccninit,       pccngetc,       pccnputc },
#if NCOM > 0
       { comcnprobe,   comcninit,      comcngetc,      comcnputc },
#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, 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;
{
       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, p)
       dev_t dev;
       caddr_t data;
       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');
       }
}