bootblock.h

FSD file system driver

/*
 * (x86) BIOS Parameter Block for FAT32
 */
struct mbr_bpbFAT32 {
	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 */
	uint32_t	bpbBigFATsecs;	/* like bpbFATsecs for FAT32 */
	uint16_t	bpbExtFlags;	/* extended flags: */
#define	MBR_FAT32_FATNUM	0x0F	/*   mask for numbering active FAT */
#define	MBR_FAT32_FATMIRROR	0x80	/*   FAT is mirrored (as previously) */
	uint16_t	bpbFSVers;	/* filesystem version */
#define	MBR_FAT32_FSVERS	0	/*   currently only 0 is understood */
	uint32_t	bpbRootClust;	/* start cluster for root directory */
	uint16_t	bpbFSInfo;	/* filesystem info structure sector */
	uint16_t	bpbBackup;	/* backup boot sector */
	uint8_t		bsReserved[12];	/* Reserved for future expansion */
	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]; /* "FAT32   " */
}; /* __attribute__((__packed__)); */

/*
 * (x86) MBR boot selector
 */
struct mbr_bootsel {
	uint8_t		mbrbs_defkey;
	uint8_t		mbrbs_flags;
	uint16_t	mbrbs_timeo;
	uint8_t		mbrbs_nametab[MBR_PART_COUNT][MBR_BS_PARTNAMESIZE + 1];
}; /* __attribute__((__packed__)); */

/*
 * MBR partition
 */
struct mbr_partition {
	uint8_t		mbrp_flag;	/* MBR partition flags */
	uint8_t		mbrp_shd;	/* Starting head */
	uint8_t		mbrp_ssect;	/* Starting sector */
	uint8_t		mbrp_scyl;	/* Starting cylinder */
	uint8_t		mbrp_type;	/* Partition type (see below) */
	uint8_t		mbrp_ehd;	/* End head */
	uint8_t		mbrp_esect;	/* End sector */
	uint8_t		mbrp_ecyl;	/* End cylinder */
	uint32_t	mbrp_start;	/* Absolute starting sector number */
	uint32_t	mbrp_size;	/* Partition size in sectors */
}; /* __attribute__((__packed__)); */

int xlat_mbr_fstype(int);	/* in sys/lib/libkern/xlat_mbr_fstype.c */

/*
 * MBR boot sector.
 * This is used by both the MBR (Master Boot Record) in sector 0 of the disk
 * and the PBR (Partition Boot Record) in sector 0 of an MBR partition.
 */
struct mbr_sector {
					/* Jump instruction to boot code.  */
					/* Usually 0xE9nnnn or 0xEBnn90 */
	uint8_t			mbr_jmpboot[3];	
					/* OEM name and version */
	uint8_t			mbr_oemname[8];	
	union {				/* BIOS Parameter Block */
		struct mbr_bpbFAT12	bpb12;
		struct mbr_bpbFAT16	bpb16;
		struct mbr_bpbFAT32	bpb32;
	} mbr_bpb;
					/* Boot code */
	uint8_t			mbr_bootcode[310];
					/* Config for /usr/mdec/mbr_bootsel */
	struct mbr_bootsel	mbr_bootsel;
					/* NT Drive Serial Number */
	uint32_t		mbr_dsn;
					/* mbr_bootsel magic */
	uint16_t		mbr_bootsel_magic;
					/* MBR partition table */
	struct mbr_partition	mbr_parts[MBR_PART_COUNT];
					/* MBR magic (0xaa55) */
	uint16_t		mbr_magic;
}; /* __attribute__((__packed__)); */

#endif	/* !defined(__ASSEMBLER__) */				/* } */

#pragma pack()


/* ------------------------------------------
 * shared --
 *	definitions shared by many platforms
 */

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

	/* Maximum # of blocks in bbi_block_table, each bbi_block_size long */
#define	SHARED_BBINFO_MAXBLOCKS	118	/* so sizeof(shared_bbinfo) == 512 */

struct shared_bbinfo {
	uint8_t bbi_magic[32];
	int32_t bbi_block_size;
	int32_t bbi_block_count;
	int32_t bbi_block_table[SHARED_BBINFO_MAXBLOCKS];
};

#if 0 /* XXX ffsdrv */

/* ------------------------------------------
 * alpha --
 *	Alpha (disk, but also tape) Boot Block.
 *
 *	See Section (III) 3.6.1 of the Alpha Architecture Reference Manual.
 */

struct alpha_boot_block {
	uint64_t bb_data[63];		/* data (disklabel, also as below) */
	uint64_t bb_cksum;		/* checksum of the boot block,
					 * taken as uint64_t's
					 */
};
#define	bb_secsize	bb_data[60]	/* secondary size (blocks) */
#define	bb_secstart	bb_data[61]	/* secondary start (blocks) */
#define	bb_flags	bb_data[62]	/* unknown flags (set to zero) */

#define	ALPHA_BOOT_BLOCK_OFFSET		0	/* offset of boot block. */
#define	ALPHA_BOOT_BLOCK_BLOCKSIZE	512	/* block size for sector
						 * size/start, and for boot
						 * block itself.
						 */

#define	ALPHA_BOOT_BLOCK_CKSUM(bb,cksum)				\
	do {								\
		const struct alpha_boot_block *_bb = (bb);		\
		uint64_t _cksum;					\
		int _i;							\
									\
		_cksum = 0;						\
		for (_i = 0;						\
		    _i < (sizeof _bb->bb_data / sizeof _bb->bb_data[0]); \
		    _i++)						\
			_cksum += _bb->bb_data[_i];			\
		*(cksum) = _cksum;					\
	} while (/*CONSTCOND*/ 0)

/* ------------------------------------------
 * apple --
 *	Apple computers boot block related information
 */

/*
 *	Driver Descriptor Map, from Inside Macintosh: Devices, SCSI Manager
 *	pp 12-13.  The driver descriptor map always resides on physical block 0.
 */
struct apple_drvr_descriptor {
	uint32_t	descBlock;	/* first block of driver */
	uint16_t	descSize;	/* driver size in blocks */
	uint16_t	descType;	/* system type */
};

/*
 *	system types; Apple reserves 0-15
 */
#define	APPLE_DRVR_TYPE_MACINTOSH	1

#define	APPLE_DRVR_MAP_MAGIC		0x4552
#define	APPLE_DRVR_MAP_MAX_DESCRIPTORS	61

struct apple_drvr_map {
	uint16_t	sbSig;		/* map signature */
	uint16_t	sbBlockSize;	/* block size of device */
	uint32_t	sbBlkCount;	/* number of blocks on device */
	uint16_t	sbDevType;	/* (used internally by ROM) */
	uint16_t	sbDevID;	/* (used internally by ROM) */
	uint32_t	sbData;		/* (used internally by ROM) */
	uint16_t	sbDrvrCount;	/* number of driver descriptors */
	struct apple_drvr_descriptor sb_dd[APPLE_DRVR_MAP_MAX_DESCRIPTORS];
	uint16_t	pad[3];
} __attribute__((__packed__));

/*
 *	Partition map structure from Inside Macintosh: Devices, SCSI Manager
 *	pp. 13-14.  The partition map always begins on physical block 1.
 *
 *	With the exception of block 0, all blocks on the disk must belong to
 *	exactly one partition.  The partition map itself belongs to a partition
 *	of type `APPLE_PARTITION_MAP', and is not limited in size by anything
 *	other than available disk space.  The partition map is not necessarily
 *	the first partition listed.
 */
#define	APPLE_PART_MAP_ENTRY_MAGIC	0x504d

struct apple_part_map_entry {
	uint16_t	pmSig;		/* partition signature */
	uint16_t	pmSigPad;	/* (reserved) */
	uint32_t	pmMapBlkCnt;	/* number of blocks in partition map */
	uint32_t	pmPyPartStart;	/* first physical block of partition */
	uint32_t	pmPartBlkCnt;	/* number of blocks in partition */
	uint8_t		pmPartName[32];	/* partition name */
	uint8_t		pmPartType[32];	/* partition type */
	uint32_t	pmLgDataStart;	/* first logical block of data area */
	uint32_t	pmDataCnt;	/* number of blocks in data area */
	uint32_t	pmPartStatus;	/* partition status information */
	uint32_t	pmLgBootStart;	/* first logical block of boot code */
	uint32_t	pmBootSize;	/* size of boot code, in bytes */
	uint32_t	pmBootLoad;	/* boot code load address */
	uint32_t	pmBootLoad2;	/* (reserved) */
	uint32_t	pmBootEntry;	/* boot code entry point */
	uint32_t	pmBootEntry2;	/* (reserved) */
	uint32_t	pmBootCksum;	/* boot code checksum */
	int8_t		pmProcessor[16]; /* processor type (e.g. "68020") */
	uint8_t		pmBootArgs[128]; /* A/UX boot arguments */
	uint8_t		pad[248];	/* pad to end of block */
};

#define	APPLE_PART_TYPE_DRIVER		"APPLE_DRIVER"
#define	APPLE_PART_TYPE_DRIVER43	"APPLE_DRIVER43"
#define	APPLE_PART_TYPE_DRIVERATA	"APPLE_DRIVER_ATA"
#define	APPLE_PART_TYPE_DRIVERIOKIT	"APPLE_DRIVER_IOKIT"
#define	APPLE_PART_TYPE_FWDRIVER	"APPLE_FWDRIVER"
#define	APPLE_PART_TYPE_FWB_COMPONENT	"FWB DRIVER COMPONENTS"
#define	APPLE_PART_TYPE_FREE		"APPLE_FREE"
#define	APPLE_PART_TYPE_MAC		"APPLE_HFS"
#define	APPLE_PART_TYPE_NETBSD		"NETBSD"
#define	APPLE_PART_TYPE_NBSD_PPCBOOT	"NETBSD/MACPPC"
#define	APPLE_PART_TYPE_NBSD_68KBOOT	"NETBSD/MAC68K"
#define	APPLE_PART_TYPE_PATCHES		"APPLE_PATCHES"
#define	APPLE_PART_TYPE_PARTMAP		"APPLE_PARTITION_MAP"
#define	APPLE_PART_TYPE_PATCHES		"APPLE_PATCHES"
#define	APPLE_PART_TYPE_SCRATCH		"APPLE_SCRATCH"
#define	APPLE_PART_TYPE_UNIX		"APPLE_UNIX_SVR2"

/*
 * "pmBootArgs" for APPLE_UNIX_SVR2 partition.
 * NetBSD/mac68k only uses Magic, Cluster, Type, and Flags.
 */
struct apple_blockzeroblock {
	uint32_t       bzbMagic;
	uint8_t        bzbCluster;
	uint8_t        bzbType;
	uint16_t       bzbBadBlockInode;
	uint16_t       bzbFlags;
	uint16_t       bzbReserved;
	uint32_t       bzbCreationTime;
	uint32_t       bzbMountTime;
	uint32_t       bzbUMountTime;
};

#define	APPLE_BZB_MAGIC		0xABADBABE
#define	APPLE_BZB_TYPEFS	1
#define	APPLE_BZB_TYPESWAP	3
#define	APPLE_BZB_ROOTFS	0x8000
#define	APPLE_BZB_USRFS		0x4000

/* ------------------------------------------
 * hp300
 *
 */

/* volume header for "LIF" format volumes */

struct	hp300_lifvol {
	int16_t	vol_id;
	char	vol_label[6];
	int32_t	vol_addr;
	int16_t	vol_oct;
	int16_t	vol_dummy;
	int32_t	vol_dirsize;
	int16_t	vol_version;
	int16_t	vol_zero;
	int32_t	vol_huh1;
	int32_t	vol_huh2;
	int32_t	vol_length;
};

/* LIF directory entry format */

struct	hp300_lifdir {
	char	dir_name[10];
	int16_t	dir_type;
	int32_t	dir_addr;
	int32_t	dir_length;
	char	dir_toc[6];
	int16_t	dir_flag;
	int32_t	dir_exec;
};

/* load header for boot rom */
struct hp300_load {