NetBSD/sys/arch/i386/stand/biosboot/devopen.c

/*	$NetBSD: devopen.c,v 1.8 1999/04/14 11:45:39 drochner 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/types.h>
#ifdef COMPAT_OLDBOOT
#include <sys/disklabel.h>
#endif

#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>

#include <libi386.h>
#include <biosdisk.h>
#include "devopen.h"
#ifdef _STANDALONE
#include <bootinfo.h>
#endif

extern int parsebootfile __P((const char *, char**, char**, unsigned int*,
			      unsigned int*, const char**));

static int dev2bios __P((char *, unsigned int, int *));

static struct {
	char           *name;
	int             biosdev;
}               biosdevtab[] = {
	{
		"fd", 0
	},
	{
		"hd", 0x80
	},
#ifdef COMPAT_OLDBOOT
	{
		"wd", 0x80
	},
	{
		"sd", 0x80
	}
#endif
};
#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) {
#if defined(COMPAT_OLDBOOT) && defined(_STANDALONE)
		extern struct disklabel disklabel;

		if(disklabel.d_magic == DISKMAGIC) {
			if(disklabel.d_type == DTYPE_SCSI)
				*devname = biosdevtab[3].name;
			else
				*devname = biosdevtab[2].name;
		} else
#endif
			/* call it "hd", we don't know better */
			*devname = biosdevtab[1].name;
	} else
		*devname = biosdevtab[0].name;

	*unit = biosdev & 0x7f;

	return (0);
}

#ifdef _STANDALONE
struct btinfo_bootpath bibp;
#endif

/*
 * 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;

#ifdef _STANDALONE
	strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
	BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
#endif

	return (biosdiskopen(f, biosdev, partition));
}