/*	$NetBSD: disklabel_mbr.h,v 1.1 1998/06/08 20:21:18 mark Exp $	*/

/*
 * Copyright (c) 1994, 1998 Christopher G. Demetriou
 * 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 by Christopher G. Demetriou
 *      for the NetBSD Project.
 * 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.
 */

/*
 * From i386 disklabel.h rev 1.6, with cleanups and modifications to
 * make it easier to use on the arm32 and to use as MI code (not quite
 * clean enough, yet).
 */

/* MBR ("Master Boot Record"; DOS) partition table -- located in boot block */
#define	MBR_BBSECTOR	0		/* MBR boot block relative sector # */
#define	MBR_PARTOFF	446
#define	NMBRPART	4

#ifndef __ASSEMBLER__
struct mbr_partition {
	unsigned char	mbrp_flag;	/* bootstrap flags */
	unsigned char	mbrp_shd;	/* starting head */
	unsigned char	mbrp_ssect;	/* starting sector */
	unsigned char	mbrp_scyl;	/* starting cylinder */
	unsigned char	mbrp_typ;	/* partition type (see below) */
	unsigned char	mbrp_ehd;	/* end head */
	unsigned char	mbrp_esect;	/* end sector */
	unsigned char	mbrp_ecyl;	/* end cylinder */
	unsigned long	mbrp_start;	/* absolute starting sector number */
	unsigned long	mbrp_size;	/* partition size in sectors */
};
#endif

/* Known MBR partition types. */
#define MBR_PTYP_NETBSD		0xa9	/* NetBSD partition type */
#define	MBR_PTYP_386BSD		0xa5	/* 386BSD partition type */
#define MBR_PTYP_FAT12		0x01	/* 12-bit FAT */
#define MBR_PTYP_FAT16S		0x04	/* 16-bit FAT, less than 32M */
#define MBR_PTYP_FAT16B		0x06	/* 16-bit FAT, more than 32M */
#define MBR_PTYP_FAT32		0x0b	/* 32-bit FAT */
#define MBR_PTYP_FAT32L		0x0c	/* 32-bit FAT, LBA-mapped */
#define MBR_PTYP_FAT16L		0x0e	/* 16-bit FAT, LBA-mapped */
#define MBR_PTYP_LNXEXT2	0x83	/* Linux native */

#ifndef __ASSEMBLER__
/* Isolate the relevant bits to get sector and cylinder. */
#define	MBR_PSECT(s)	((s) & 0x3f)
#define	MBR_PCYL(c, s)	((c) + (((s) & 0xc0) << 2))
#endif

#if defined(_KERNEL) && !defined(__ASSEMBLER__)
struct buf;
struct cpu_disklabel;
struct disklabel;

/* for readdisklabel.  rv != 0 -> matches, msg == NULL -> success */
int	mbr_label_read __P((dev_t, void (*)(struct buf *), struct disklabel *,
	    struct cpu_disklabel *, char **, int *, int *));
/* for writedisklabel.  rv == 0 -> dosen't match, rv > 0 -> success */
int	mbr_label_locate __P((dev_t, void (*)(struct buf *),
	    struct disklabel *, struct cpu_disklabel *, int *, int *));
#endif