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pcio.c revision 1.3 
      1 /*	$NetBSD: pcio.c,v 1.3 1997/03/22 01:48:37 thorpej Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1996
      5  *	Matthias Drochner.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed for the NetBSD Project
     18  *	by Matthias Drochner.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  *
     33  */
     34 
     35 /*
     36  * console I/O needs lowlevel routines from conio.S and comio.S
     37  */
     38 
     39 #include <lib/libsa/stand.h>
     40 
     41 #include "libi386.h"
     42 
     43 extern void conputc __P((int));
     44 extern int congetc __P((void));
     45 extern int coniskey __P((void));
     46 
     47 #ifdef SUPPORT_SERIAL
     48 extern int computc __P((int, int));
     49 extern int comgetc __P((int));
     50 extern int comstatus __P((int));
     51 
     52 static int      iodev;
     53 #endif
     54 
     55 static char    *iodevname[] = {
     56 	"pc",
     57 #ifdef SUPPORT_SERIAL
     58 	"com0",
     59 	"com1"
     60 #endif
     61 };
     62 
     63 char           *
     64 initio(dev)
     65 	int             dev;
     66 {
     67 #ifdef SUPPORT_SERIAL
     68 	switch (dev) {
     69 	case CONSDEV_AUTO:
     70 		/*
     71 		 * serial console must have hardware handshake! check: 1.
     72 		 * character output without error 2. status bits for modem
     73 		 * ready set (status seems only useful after character
     74 		 * output)
     75 		 */
     76 		cominit(0);
     77 		if (!(computc(' ', 0) & 0x80) && (comstatus(0) & 0x00b0))
     78 			dev = CONSDEV_COM0;
     79 		else {
     80 			cominit(1);
     81 			if (!(computc(' ', 1) & 0x80) && (comstatus(1) & 0x00b0))
     82 				dev = CONSDEV_COM1;
     83 			else
     84 				dev = CONSDEV_PC;
     85 		}
     86 		break;
     87 	case CONSDEV_COM0:
     88 		cominit(0);
     89 		break;
     90 	case CONSDEV_COM1:
     91 		cominit(1);
     92 		break;
     93 	default:
     94 		dev = CONSDEV_PC;
     95 		break;
     96 	}
     97 	return (iodevname[iodev = dev]);
     98 #else
     99 	return (iodevname[0]);
    100 #endif
    101 }
    102 
    103 static inline void
    104 internal_putchar(c)
    105 	int             c;
    106 {
    107 #ifdef SUPPORT_SERIAL
    108 	switch (iodev) {
    109 	case CONSDEV_PC:
    110 #endif
    111 		conputc(c);
    112 #ifdef SUPPORT_SERIAL
    113 		break;
    114 	case CONSDEV_COM0:
    115 		computc(c, 0);
    116 		break;
    117 	case CONSDEV_COM1:
    118 		computc(c, 1);
    119 		break;
    120 	}
    121 #endif
    122 }
    123 
    124 void
    125 putchar(c)
    126 	int             c;
    127 {
    128 	if (c == '\n')
    129 		internal_putchar('\r');
    130 	internal_putchar(c);
    131 }
    132 
    133 int
    134 getchar()
    135 {
    136 #ifdef SUPPORT_SERIAL
    137 	switch (iodev) {
    138 		case CONSDEV_PC:
    139 #endif
    140 		return (congetc());
    141 #ifdef SUPPORT_SERIAL
    142 	case CONSDEV_COM0:
    143 		return (comgetc(0));
    144 	case CONSDEV_COM1:
    145 		return (comgetc(1));
    146 	}
    147 #endif
    148 }
    149 
    150 int
    151 iskey()
    152 {
    153 #ifdef SUPPORT_SERIAL
    154 	switch (iodev) {
    155 		case CONSDEV_PC:
    156 #endif
    157 		return (coniskey());
    158 #ifdef SUPPORT_SERIAL
    159 	case CONSDEV_COM0:
    160 		return (!!(comstatus(0) & 0x0100));
    161 	case CONSDEV_COM1:
    162 		return (!!(comstatus(1) & 0x0100));
    163 	}
    164 #endif
    165 }
    166