bootblock.h

FSD file system driver

/*	$NetBSD: bootblock.h,v 1.24 2004/03/22 07:11:00 lukem Exp $	*/

/*-
 * Copyright (c) 2002-2004 The NetBSD Foundation, Inc.
 * 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 the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */
/*-
 * Copyright (C) 1993	Allen K. Briggs, Chris P. Caputo,
 *			Michael L. Finch, Bradley A. Grantham, and
 *			Lawrence A. Kesteloot
 * 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 the Alice Group.
 * 4. The names of the Alice Group or any of its members may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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.
 *
 */
/*
 * Copyright (c) 1994, 1999 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.
 */
/*
 * Copyright (c) 1994 Rolf Grossmann
 * 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 Rolf Grossmann.
 * 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.
 */

#ifndef _SYS_BOOTBLOCK_H
#define	_SYS_BOOTBLOCK_H

#include "type.h"

#if 0 /* XXX ffsdrv */
#if !defined(__ASSEMBLER__)
#if defined(_KERNEL) || defined(_STANDALONE)
#include <sys/stdint.h>
#else
#include <stdint.h>
#endif
#endif	/* !defined(__ASSEMBLER__) */
#endif

/* ------------------------------------------
 * MBR (Master Boot Record) --
 *	definitions for systems that use MBRs
 */

/*
 * Layout of boot records:
 *
 *	Byte range	Use	Description
 *	----------	---	-----------
 *
 *	0 - 2		FMP	JMP xxx, NOP
 *	3 - 10		FP	OEM Name
 *
 *	11 - 61		FMP	FAT12/16 BPB
 *				Whilst not strictly necessary for MBR,
 *				GRUB reserves this area
 *
 *	11 - 89		P	FAT32 BPB
 *				(are we ever going to boot off this?)
 *
 *
 *	62 - 217	FMP	Boot code
 *
 *	90 - 217	P	FAT32 boot code
 *
 *	218 - 223	M	Win95b/98/me "drive time"
 *		http://www.geocities.com/thestarman3/asm/mbr/95BMEMBR.htm#MYST
 *				only changed if all 6 bytes are 0
 *
 *	224 - 436	FMP	boot code (continued)
 *
 *	437 - 439	M	WinNT/2K/XP MBR "boot language"
 *		http://www.geocities.com/thestarman3/asm/mbr/Win2kmbr.htm
 *				not needed by us
 *
 *	400 - 439	MP	NetBSD: mbr_bootsel
 *
 *	440 - 443	M	WinNT/2K/XP Drive Serial Number (NT DSN)
 *		http://www.geocities.com/thestarman3/asm/mbr/Win2kmbr.htm
 *
 *	444 - 445	FMP	bootcode or unused
 *				NetBSD: mbr_bootsel_magic
 *
 *	446 - 509	M	partition table
 *
 *	510 - 511	FMP	magic number (0xAA55)
 *
 *	Use:
 *	----
 *	F	Floppy boot sector
 *	M	Master Boot Record
 *	P	Partition Boot record
 *
 */

/*
 * MBR (Master Boot Record)
 */
#define	MBR_BBSECTOR		0	/* MBR relative sector # */
#define	MBR_BPB_OFFSET		11	/* offsetof(mbr_sector, mbr_bpb) */
#define	MBR_BOOTCODE_OFFSET	90	/* offsetof(mbr_sector, mbr_bootcode) */
#define	MBR_BS_OFFSET		400	/* offsetof(mbr_sector, mbr_bootsel) */
#define	MBR_DSN_OFFSET		440	/* offsetof(mbr_sector, mbr_dsn) */
#define	MBR_BS_MAGIC_OFFSET	444	/* offsetof(mbr_sector, mbr_bootsel_magic) */
#define	MBR_PART_OFFSET		446	/* offsetof(mbr_sector, mbr_part[0]) */
#define	MBR_MAGIC_OFFSET	510	/* offsetof(mbr_sector, mbr_magic) */
#define	MBR_MAGIC		0xaa55	/* MBR magic number */
#define	MBR_BS_MAGIC		0xb5e1	/* mbr_bootsel magic number */
#define	MBR_PART_COUNT		4	/* Number of partitions in MBR */
#define	MBR_BS_PARTNAMESIZE	8	/* Size of name mbr_bootsel nametab */
					/* (excluding trailing NUL) */

		/* values for mbr_partition.mbrp_flag */
#define	MBR_PFLAG_ACTIVE	0x80	/* The active partition */

		/* values for mbr_partition.mbrp_type */
#define	MBR_PTYPE_FAT12		0x01	/* 12-bit FAT */
#define	MBR_PTYPE_FAT16S	0x04	/* 16-bit FAT, less than 32M */
#define	MBR_PTYPE_EXT		0x05	/* extended partition */
#define	MBR_PTYPE_FAT16B	0x06	/* 16-bit FAT, more than 32M */
#define	MBR_PTYPE_NTFS		0x07	/* OS/2 HPFS, NTFS, QNX2, Adv. UNIX */
#define	MBR_PTYPE_FAT32		0x0b	/* 32-bit FAT */
#define	MBR_PTYPE_FAT32L	0x0c	/* 32-bit FAT, LBA-mapped */
#define	MBR_PTYPE_FAT16L	0x0e	/* 16-bit FAT, LBA-mapped */
#define	MBR_PTYPE_EXT_LBA	0x0f	/* extended partition, LBA-mapped */
#define	MBR_PTYPE_ONTRACK	0x54
#define	MBR_PTYPE_LNXSWAP	0x82	/* Linux swap or Solaris */
#define	MBR_PTYPE_LNXEXT2	0x83	/* Linux native */
#define	MBR_PTYPE_EXT_LNX	0x85	/* Linux extended partition */
#define	MBR_PTYPE_NTFSVOL	0x87	/* NTFS volume set or HPFS mirrored */
#define	MBR_PTYPE_PREP		0x41	/* PReP */
#define	MBR_PTYPE_386BSD	0xa5	/* 386BSD partition type */
#define	MBR_PTYPE_APPLEUFS 	0xa8	/* Apple UFS */
#define	MBR_PTYPE_NETBSD	0xa9	/* NetBSD partition type */
#define	MBR_PTYPE_OPENBSD	0xa6	/* OpenBSD partition type */

#define	MBR_PSECT(s)		((s) & 0x3f)
#define	MBR_PCYL(c, s)		((c) + (((s) & 0xc0) << 2))

#define	MBR_IS_EXTENDED(x)	((x) == MBR_PTYPE_EXT || \
				 (x) == MBR_PTYPE_EXT_LBA || \
				 (x) == MBR_PTYPE_EXT_LNX)

		/* values for mbr_bootsel.mbrbs_flags */
#define	MBR_BS_ACTIVE	0x01	/* Bootselector active (or code present) */
#define	MBR_BS_EXTINT13	0x02	/* Set by fdisk if LBA needed (deprecated) */
#define	MBR_BS_READ_LBA	0x04	/* Force LBA reads - even for low numbers */
#define	MBR_BS_EXTLBA	0x08	/* Extended ptn capable (LBA reads) */
#define	MBR_BS_NEWMBR	0x80	/* New bootsel at offset 440 */

#if !defined(__ASSEMBLER__)					/* { */

#pragma pack(1)

/*
 * (x86) BIOS Parameter Block for FAT12
 */
struct mbr_bpbFAT12 {
	uint16_t	bpbBytesPerSec;	/* bytes per sector */
	uint8_t		bpbSecPerClust;	/* sectors per cluster */
	uint16_t	bpbResSectors;	/* number of reserved sectors */
	uint8_t		bpbFATs;	/* number of FATs */
	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
	uint16_t	bpbSectors;	/* total number of sectors */
	uint8_t		bpbMedia;	/* media descriptor */
	uint16_t	bpbFATsecs;	/* number of sectors per FAT */
	uint16_t	bpbSecPerTrack;	/* sectors per track */
	uint16_t	bpbHeads;	/* number of heads */
	uint16_t	bpbHiddenSecs;	/* # of hidden sectors */
}; /* __attribute__((__packed__)); */

/*
 * (x86) BIOS Parameter Block for FAT16
 */
struct mbr_bpbFAT16 {
	uint16_t	bpbBytesPerSec;	/* bytes per sector */
	uint8_t		bpbSecPerClust;	/* sectors per cluster */
	uint16_t	bpbResSectors;	/* number of reserved sectors */
	uint8_t		bpbFATs;	/* number of FATs */
	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
	uint16_t	bpbSectors;	/* total number of sectors */
	uint8_t		bpbMedia;	/* media descriptor */
	uint16_t	bpbFATsecs;	/* number of sectors per FAT */
	uint16_t	bpbSecPerTrack;	/* sectors per track */
	uint16_t	bpbHeads;	/* number of heads */
	uint32_t	bpbHiddenSecs;	/* # of hidden sectors */
	uint32_t	bpbHugeSectors;	/* # of sectors if bpbSectors == 0 */
	uint8_t		bsDrvNum;	/* Int 0x13 drive number (e.g. 0x80) */
	uint8_t		bsReserved1;	/* Reserved; set to 0 */
	uint8_t		bsBootSig;	/* 0x29 if next 3 fields are present */
	uint8_t		bsVolID[4];	/* Volume serial number */
	uint8_t		bsVolLab[11];	/* Volume label */
	uint8_t		bsFileSysType[8];
					/* "FAT12   ", "FAT16   ", "FAT     " */
}; /* __attribute__((__packed__)); */