/*	$NetBSD: mbr.h,v 1.6 2020/10/12 16:14:32 martin 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. 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))

#define MBR_DEV_LEN	16		/* for wedge names */

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 */
	const char	*last_mounted[MBR_PART_COUNT];
	uint		fs_type[MBR_PART_COUNT], fs_sub_type[MBR_PART_COUNT];
#ifdef BOOTSEL
	/* only in first item... */
	uint		bootsec;	/* start sector of bootmenu default */
#endif
	/* for temporary access */
	char		wedge[MBR_PART_COUNT][MBR_DEV_LEN];
};

#ifdef BOOTSEL
extern 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 	partsoverlap(struct mbr_partition *, int, int);

/* from mbr.c */

int	guess_biosgeom_from_parts(struct disk_partitions*, int *, int *, int *);
/* same return values as edit_outer_parts() */
int	set_bios_geom_with_mbr_guess(struct disk_partitions*);
void	set_bios_geom(struct disk_partitions *, int *cyl, int *head, int *sec);
int	otherpart(int);
int	ourpart(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

/*
 * MBR specific: check if the chosen partitioning will work
 * and perform any MD queries/fixup.
 * With quiet = true, try to avoid user interaction and
 * never return 1.
 *
 * Return value:
 *  0 -> abort
 *  1 -> re-edit
 *  2 -> continue installation
*/
int	md_check_mbr(struct disk_partitions*, mbr_info_t*, bool quiet);

/*
 * Called early during updates (before md_pre_update),
 * returns true if partitions have been modified.
 */
bool	md_mbr_update_check(struct disk_partitions*, mbr_info_t*);

#endif