/*	$NetBSD: mbr.h,v 1.20 2004/06/06 06:06:59 christos Exp $	*/

/*
 * Copyright 1997, 1988 Piermont Information Systems Inc.
 * All rights reserved.
 *
 * Written by Philip A. Nelson for Piermont Information Systems Inc.
 *
 * 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
 *      Piermont Information Systems Inc.
 * 4. The name of Piermont Information Systems Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``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 PIERMONT INFORMATION SYSTEMS INC. 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.
 *
 */

#ifndef _MBR_H
#define _MBR_H

/*
 * mbr.h -- definitions for reading, writing and editing DOS MBRs.
 * Use by including from md.h on ports  which use MBRs (i386, powerpc, arc)
 * naming convention:  dlxxxx => NetBSD disklabel, bxxxx => bios
 */

/* constants and defines */

#include <sys/bootblock.h>

/*      
 * XXX  I (dsl) haven't the foggiest idea what the MBR extended chain
 *	looks like if the sector size isn't 512.
 */     
#define MBR_SECSIZE     512

#define MBR_PUT_LSCYL(c)		((c) & 0xff)
#define MBR_PUT_MSCYLANDSEC(c,s)	(((s) & 0x3f) | (((c) >> 2) & 0xc0))

typedef struct mbr_info_t mbr_info_t;
struct mbr_info_t {
	struct mbr_sector	mbr;
#ifdef BOOTSEL
	struct mbr_bootsel	mbrb;	/* writeable for any mbr code */
	uint		oflags;
#endif
	uint		sector;		/* where we read this from */
	mbr_info_t	*extended;	/* next in extended partition list */
	mbr_info_t	*prev_ext;	/* and back ptr */
	const char	*last_mounted[MBR_PART_COUNT];
	/* only in first item... */
	int		opt;		/* entry being edited */
	uint		install;	/* start sector of install partition */
#ifdef BOOTSEL
	uint		bootsec;	/* start sector of bootmenu default */
#endif
};

/* incore fdisk (mbr, bios) geometry */
int bcyl, bhead, bsec, bsize, bcylsize;

mbr_info_t mbr;

#ifdef BOOTSEL
struct mbr_bootsel *mbs;

	/* sync with src/sbin/fdisk/fdisk.c */
#define	DEFAULT_BOOTDIR		"/usr/mdec"
#define	DEFAULT_BOOTCODE	"mbr"
#define	DEFAULT_BOOTSELCODE	"mbr_bootsel"
#define	DEFAULT_BOOTEXTCODE	"mbr_ext"

/* Scan values for the various keys we use, as returned by the BIOS */
#define	SCAN_ENTER	0x1c
#define	SCAN_F1		0x3b
#define	SCAN_1		0x2

#endif /* BOOTSEL */

/* from mbr.c */
void	set_fdisk_geom(void);	/* edit incore BIOS geometry */
void	disp_cur_geom(void);
int	check_geom(void);		/* primitive geometry sanity-check */

void	disp_cur_part(struct mbr_partition *, int, int);
int	edit_mbr(mbr_info_t *);
int 	partsoverlap(struct mbr_partition *, int, int);

/* from mbr.c */
 
int     read_mbr(const char *, mbr_info_t *);
int     write_mbr(const char *, mbr_info_t *, int);
int     valid_mbr(struct mbr_sector *);
int	guess_biosgeom_from_mbr(mbr_info_t *, int *, int *, int *);
int	md_bios_info(char *);
void	set_bios_geom(int, int, int);
int	otherpart(int);
int	ourpart(int);
const char	*get_partname(int);
void	edit_ptn_bounds(void);
#ifdef BOOTSEL
void	disp_bootsel(void);
void	edit_bootsel_entry(int);
void	edit_bootsel_timeout(void);
void	edit_bootsel_default_ptn(int);
void	edit_bootsel_default_disk(int);
void	configure_bootsel(void);
#endif

#endif