/*	$NetBSD: devopen.c,v 1.1.1.1 1997/03/14 02:40:31 perry Exp $	*/

/*
 * Copyright (c) 1996, 1997
 *	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.
 *
 */


#include <sys/param.h>

#include <lib/libsa/stand.h>

#include <libi386.h>
#include <biosdisk.h>

static struct {
    char *name;
    int biosdev;
} biosdevtab[] = {
    {"fd", 0},
    {"wd", 0x80},
    {"sd", 0x80},
    {"hd", 0x80}
};
#define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))

static int
dev2bios(devname, unit, biosdev)
char *devname;
unsigned int unit;
int *biosdev;
{
    int i;

    for(i = 0; i < NUMBIOSDEVS; i++)
	if(!strcmp(devname, biosdevtab[i].name)) {
	    *biosdev = biosdevtab[i].biosdev + unit;
	    break;
	}
    if(i == NUMBIOSDEVS)
	return(ENXIO);

    if(unit >= 4)  /* ??? */
	return(EUNIT);

    return(0);
}

int
bios2dev(biosdev, devname, unit)
int biosdev;
char **devname;
unsigned int *unit;
{
    if(biosdev & 0x80) /* call it "hd", we don't know better */
	*devname = biosdevtab[3].name;
    else
	*devname = biosdevtab[0].name;

    *unit = biosdev & 0x7f;

    return(0);
}

/*
 * Open the BIOS disk device
 */
int
devopen(f, fname, file)
struct open_file *f;
const char *fname;
char **file;
{
    char *fsname, *devname;
    unsigned int unit, partition;
    int biosdev;
    int error;
    struct devsw *dp;

    if((error = parsebootfile(fname, &fsname, &devname,
			      &unit, &partition, (const char**)file))
       || (error = dev2bios(devname, unit, &biosdev)))
	return(error);

    dp = &devsw[0]; /* must be biosdisk */
    f->f_dev = dp;
    return(biosdiskopen(f, biosdev, partition));
}