xref: /src/sys/arch/i386/stand/lib/pcio.c

/*	$NetBSD: pcio.c,v 1.4 1997/06/13 13:41:20 drochner Exp $	 */

/*
 * Copyright (c) 1996
 *	Matthias Drochner.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for the NetBSD Project
 *	by Matthias Drochner.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 * console I/O
 * needs lowlevel routines from conio.S and comio.S
 */

#include <lib/libsa/stand.h>

#include "libi386.h"

extern void conputc __P((int));
extern int congetc __P((void));
extern int coniskey __P((void));

#ifdef SUPPORT_SERIAL
extern void cominit __P((int));
extern int computc __P((int, int));
extern int comgetc __P((int));
extern int comstatus __P((int));

static int      iodev;
#endif

static char    *iodevname[] = {
	"pc",
#ifdef SUPPORT_SERIAL
	"com0",
	"com1"
#endif
};

char           *
initio(dev)
	int             dev;
{
#ifdef SUPPORT_SERIAL
	switch (dev) {
	case CONSDEV_AUTO:
		/*
		 * serial console must have hardware handshake! check: 1.
		 * character output without error 2. status bits for modem
		 * ready set (status seems only useful after character
		 * output)
		 */
		cominit(0);
		if (!(computc(' ', 0) & 0x80) && (comstatus(0) & 0x00b0))
			dev = CONSDEV_COM0;
		else {
			cominit(1);
			if (!(computc(' ', 1) & 0x80) && (comstatus(1) & 0x00b0))
				dev = CONSDEV_COM1;
			else
				dev = CONSDEV_PC;
		}
		break;
	case CONSDEV_COM0:
		cominit(0);
		break;
	case CONSDEV_COM1:
		cominit(1);
		break;
	default:
		dev = CONSDEV_PC;
		break;
	}
	return (iodevname[iodev = dev]);
#else
	return (iodevname[0]);
#endif
}

static inline void
internal_putchar(c)
	int             c;
{
#ifdef SUPPORT_SERIAL
	switch (iodev) {
	case CONSDEV_PC:
#endif
		conputc(c);
#ifdef SUPPORT_SERIAL
		break;
	case CONSDEV_COM0:
		computc(c, 0);
		break;
	case CONSDEV_COM1:
		computc(c, 1);
		break;
	}
#endif
}

void
putchar(c)
	int             c;
{
	if (c == '\n')
		internal_putchar('\r');
	internal_putchar(c);
}

int
getchar()
{
#ifdef SUPPORT_SERIAL
	switch (iodev) {
		default: /* to make gcc -Wall happy... */
		case CONSDEV_PC:
#endif
		return (congetc());
#ifdef SUPPORT_SERIAL
	case CONSDEV_COM0:
		return (comgetc(0));
	case CONSDEV_COM1:
		return (comgetc(1));
	}
#endif
}

int
iskey()
{
#ifdef SUPPORT_SERIAL
	switch (iodev) {
		default: /* to make gcc -Wall happy... */
		case CONSDEV_PC:
#endif
		return (coniskey());
#ifdef SUPPORT_SERIAL
	case CONSDEV_COM0:
		return (!!(comstatus(0) & 0x0100));
	case CONSDEV_COM1:
		return (!!(comstatus(1) & 0x0100));
	}
#endif
}