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      1 /*	$NetBSD: cons.c,v 1.1 2014/02/24 07:23:43 skrll 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. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah Hdr: cons.c 1.7 92/02/28
     37  *
     38  *	@(#)cons.c	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #include "libsa.h"
     42 #include <sys/param.h>
     43 #include <dev/cons.h>
     44 
     45 int noconsole;
     46 
     47 void
     48 cninit(void)
     49 {
     50 	struct consdev *cp;
     51 
     52 	cn_tab = NULL;
     53 	noconsole = 1;
     54 	for (cp = constab; cp->cn_probe; cp++) {
     55 		(*cp->cn_probe)(cp);
     56 		if (cp->cn_pri > CN_DEAD &&
     57 		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) {
     58 			cn_tab = cp;
     59 		}
     60 	}
     61 	if (cn_tab) {
     62 		(*cn_tab->cn_init)(cn_tab);
     63 		noconsole = 0;
     64 	}
     65 }
     66 
     67 int
     68 cngetc(void)
     69 {
     70 
     71 	if (cn_tab)
     72 		return((*cn_tab->cn_getc)(0));
     73 	return(0);
     74 }
     75 
     76 int
     77 tcngetc(void)
     78 {
     79 	if (cn_tab)
     80 		return((*cn_tab->cn_getc)(0x80));
     81 	return(0);
     82 }
     83 
     84 void
     85 cnputc(int c)
     86 {
     87 
     88 	/* Note: the dev_t arguments are not used! */
     89 	if (cn_tab)
     90 		(*cn_tab->cn_putc)(0, c);
     91 }
     92