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cninit.c revision 1.1 
      1 /*	$NetBSD: cninit.c,v 1.1 1995/04/11 10:06:42 mellon Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  * from: Utah $Hdr: cons.c 1.7 92/01/21$
     41  *
     42  *	@(#)cons.c	8.2 (Berkeley) 1/12/94
     43  */
     44 
     45 #include <sys/param.h>
     46 #include <sys/proc.h>
     47 #include <sys/user.h>
     48 #include <sys/systm.h>
     49 #include <sys/buf.h>
     50 #include <sys/ioctl.h>
     51 #include <sys/tty.h>
     52 #include <sys/file.h>
     53 #include <sys/conf.h>
     54 #include <sys/vnode.h>
     55 
     56 #include <dev/cons.h>
     57 
     58 extern struct consdev constab[];
     59 
     60 extern struct	tty *constty = NULL;	/* virtual console output device */
     61 extern struct	consdev *cn_tab;	/* physical console device info */
     62 extern struct	vnode *cn_devvp;	/* vnode for underlying device. */
     63 
     64 void
     65 cninit()
     66 {
     67 	register struct consdev *cp;
     68 
     69 	/*
     70 	 * Collect information about all possible consoles
     71 	 * and find the one with highest priority
     72 	 */
     73 	for (cp = constab; cp->cn_probe; cp++) {
     74 		(*cp->cn_probe)(cp);
     75 		if (cp->cn_pri > CN_DEAD &&
     76 		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
     77 			cn_tab = cp;
     78 	}
     79 	/*
     80 	 * No console, we can handle it
     81 	 */
     82 	if ((cp = cn_tab) == NULL)
     83 		return;
     84 	/*
     85 	 * Turn on console
     86 	 */
     87 	(*cp->cn_init)(cp);
     88 }
     89