xnu-6153.121.1.tar.gz

[apple/xnu.git] / bsd / sys / disklabel.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1987, 1988, 1993
 *	The Regents of the University of California.  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 University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)disklabel.h	8.2 (Berkeley) 7/10/94
 */
#ifndef _SYS_DISKLABEL_H_
#define _SYS_DISKLABEL_H_

#include <sys/appleapiopts.h>
#include <sys/types.h>          /* for daddr_t */

#ifdef __APPLE_API_OBSOLETE

/*
 * Disk description table, see disktab(5)
 */
#define _PATH_DISKTAB   "/etc/disktab"
#define DISKTAB         "/etc/disktab"          /* deprecated */

/*
 * Each disk has a label which includes information about the hardware
 * disk geometry, filesystem partitions, and drive specific information.
 * The location of the label, as well as the number of partitions the
 * label can describe and the number of the "whole disk" (raw)
 * paritition are machine dependent.
 */
#include <machine/disklabel.h>

/*
 * The absolute maximum number of disk partitions allowed.
 * This is the maximum value of MAXPARTITIONS for which 'struct disklabel'
 * is <= DEV_BSIZE bytes long.  If MAXPARTITIONS is greater than this, beware.
 */
#define MAXMAXPARTITIONS        22
#if MAXPARTITIONS > MAXMAXPARTITIONS
#warning beware: MAXPARTITIONS bigger than MAXMAXPARTITIONS
#endif

/*
 * Translate between device numbers and major/disk unit/disk partition.
 */
#define DISKUNIT(dev)   (minor(dev) / MAXPARTITIONS)
#define DISKPART(dev)   (minor(dev) % MAXPARTITIONS)
#define MAKEDISKDEV(maj, unit, part) \
    (makedev((maj), ((unit) * MAXPARTITIONS) + (part)))

#define DISKMAGIC       ((u_int32_t)0x82564557) /* The disk magic number */

#ifndef LOCORE
struct disklabel {
	u_int32_t d_magic;              /* the magic number */
	u_int16_t d_type;               /* drive type */
	u_int16_t d_subtype;            /* controller/d_type specific */
	char      d_typename[16];       /* type name, e.g. "eagle" */

	/*
	 * d_packname contains the pack identifier and is returned when
	 * the disklabel is read off the disk or in-core copy.
	 * d_boot0 and d_boot1 are the (optional) names of the
	 * primary (block 0) and secondary (block 1-15) bootstraps
	 * as found in /usr/mdec.  These are returned when using
	 * getdiskbyname(3) to retrieve the values from /etc/disktab.
	 */
	union {
		char    un_d_packname[16];      /* pack identifier */
		struct {
			char *un_d_boot0;       /* primary bootstrap name */
			char *un_d_boot1;       /* secondary bootstrap name */
		} un_b;
	} d_un;
#define d_packname      d_un.un_d_packname
#define d_boot0         d_un.un_b.un_d_boot0
#define d_boot1         d_un.un_b.un_d_boot1

	/* disk geometry: */
	u_int32_t d_secsize;            /* # of bytes per sector */
	u_int32_t d_nsectors;           /* # of data sectors per track */
	u_int32_t d_ntracks;            /* # of tracks per cylinder */
	u_int32_t d_ncylinders;         /* # of data cylinders per unit */
	u_int32_t d_secpercyl;          /* # of data sectors per cylinder */
	u_int32_t d_secperunit;         /* # of data sectors per unit */

	/*
	 * Spares (bad sector replacements) below are not counted in
	 * d_nsectors or d_secpercyl.  Spare sectors are assumed to
	 * be physical sectors which occupy space at the end of each
	 * track and/or cylinder.
	 */
	u_int16_t d_sparespertrack;     /* # of spare sectors per track */
	u_int16_t d_sparespercyl;       /* # of spare sectors per cylinder */
	/*
	 * Alternate cylinders include maintenance, replacement, configuration
	 * description areas, etc.
	 */
	u_int32_t d_acylinders;         /* # of alt. cylinders per unit */

	/* hardware characteristics: */
	/*
	 * d_interleave, d_trackskew and d_cylskew describe perturbations
	 * in the media format used to compensate for a slow controller.
	 * Interleave is physical sector interleave, set up by the
	 * formatter or controller when formatting.  When interleaving is
	 * in use, logically adjacent sectors are not physically
	 * contiguous, but instead are separated by some number of
	 * sectors.  It is specified as the ratio of physical sectors
	 * traversed per logical sector.  Thus an interleave of 1:1
	 * implies contiguous layout, while 2:1 implies that logical
	 * sector 0 is separated by one sector from logical sector 1.
	 * d_trackskew is the offset of sector 0 on track N relative to
	 * sector 0 on track N-1 on the same cylinder.  Finally, d_cylskew
	 * is the offset of sector 0 on cylinder N relative to sector 0
	 * on cylinder N-1.
	 */
	u_int16_t d_rpm;                /* rotational speed */
	u_int16_t d_interleave;         /* hardware sector interleave */
	u_int16_t d_trackskew;          /* sector 0 skew, per track */
	u_int16_t d_cylskew;            /* sector 0 skew, per cylinder */
	u_int32_t d_headswitch;         /* head switch time, usec */
	u_int32_t d_trkseek;            /* track-to-track seek, usec */
	u_int32_t d_flags;              /* generic flags */
#define NDDATA 5
	u_int32_t d_drivedata[NDDATA];  /* drive-type specific information */
#define NSPARE 5
	u_int32_t d_spare[NSPARE];      /* reserved for future use */
	u_int32_t d_magic2;             /* the magic number (again) */
	u_int16_t d_checksum;           /* xor of data incl. partitions */

	/* filesystem and partition information: */
	u_int16_t d_npartitions;        /* number of partitions in following */
	u_int32_t d_bbsize;             /* size of boot area at sn0, bytes */
	u_int32_t d_sbsize;             /* max size of fs superblock, bytes */
	struct  partition {             /* the partition table */
		u_int32_t p_size;       /* number of sectors in partition */
		u_int32_t p_offset;     /* starting sector */
		u_int32_t p_fsize;      /* filesystem basic fragment size */
		u_int8_t p_fstype;      /* filesystem type, see below */
		u_int8_t p_frag;        /* filesystem fragments per block */
		union {
			u_int16_t cpg;  /* UFS: FS cylinders per group */
			u_int16_t sgs;  /* LFS: FS segment shift */
		} __partition_u1;
#define p_cpg   __partition_u1.cpg
#define p_sgs   __partition_u1.sgs
	} d_partitions[MAXPARTITIONS];  /* actually may be more */
};
#else /* LOCORE */
/*
 * offsets for asm boot files.
 */
.set    d_secsize, 40
.set    d_nsectors, 44
.set    d_ntracks, 48
.set    d_ncylinders, 52
.set    d_secpercyl, 56
.set    d_secperunit, 60
.set    d_end_, 276                     /* size of disk label */
#endif /* LOCORE */

/* d_type values: */
#define DTYPE_SMD               1               /* SMD, XSMD; VAX hp/up */
#define DTYPE_MSCP              2               /* MSCP */
#define DTYPE_DEC               3               /* other DEC (rk, rl) */
#define DTYPE_SCSI              4               /* SCSI */
#define DTYPE_ESDI              5               /* ESDI interface */
#define DTYPE_ST506             6               /* ST506 etc. */
#define DTYPE_HPIB              7               /* CS/80 on HP-IB */
#define DTYPE_HPFL              8               /* HP Fiber-link */
#define DTYPE_FLOPPY            10              /* floppy */

#ifdef DKTYPENAMES
static const char *dktypenames[] = {
	"unknown",
	"SMD",
	"MSCP",
	"old DEC",
	"SCSI",
	"ESDI",
	"ST506",
	"HP-IB",
	"HP-FL",
	"type 9",
	"floppy",
	NULL
};
#define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
#endif

/*
 * Filesystem type and version.
 * Used to interpret other filesystem-specific
 * per-partition information.
 */
#define FS_UNUSED       0               /* unused */
#define FS_SWAP         1               /* swap */
#define FS_V6           2               /* Sixth Edition */
#define FS_V7           3               /* Seventh Edition */
#define FS_SYSV         4               /* System V */
#define FS_V71K         5               /* V7 with 1K blocks (4.1, 2.9) */
#define FS_V8           6               /* Eighth Edition, 4K blocks */
#define FS_BSDFFS       7               /* 4.2BSD fast file system */
#define FS_MSDOS        8               /* MSDOS file system */
#define FS_BSDLFS       9               /* 4.4BSD log-structured file system */
#define FS_OTHER        10              /* in use, but unknown/unsupported */
#define FS_HPFS         11              /* OS/2 high-performance file system */
#define FS_ISO9660      12              /* ISO 9660, normally CD-ROM */
#define FS_BOOT         13              /* partition contains bootstrap */
#define FS_ADOS         14              /* AmigaDOS fast file system */
#define FS_HFS          15              /* Macintosh HFS */

#ifdef  DKTYPENAMES
static const char *fstypenames[] = {
	"unused",
	"swap",
	"Version 6",
	"Version 7",
	"System V",
	"4.1BSD",
	"Eighth Edition",
	"4.2BSD",
	"MSDOS",
	"4.4LFS",
	"unknown",
	"HPFS",
	"ISO9660",
	"boot",
	"ADOS",
	"HFS",
	NULL
};
#define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
#endif

/*
 * flags shared by various drives:
 */
#define         D_REMOVABLE     0x01            /* removable media */
#define         D_ECC           0x02            /* supports ECC */
#define         D_BADSECT       0x04            /* supports bad sector forw. */
#define         D_RAMDISK       0x08            /* disk emulator */
#define         D_CHAIN         0x10            /* can do back-back transfers */

/*
 * Drive data for SMD.
 */
#define d_smdflags      d_drivedata[0]
#define         D_SSE           0x1             /* supports skip sectoring */
#define d_mindist       d_drivedata[1]
#define d_maxdist       d_drivedata[2]
#define d_sdist         d_drivedata[3]

/*
 * Drive data for ST506.
 */
#define d_precompcyl    d_drivedata[0]
#define d_gap3          d_drivedata[1]          /* used only when formatting */

/*
 * Drive data for SCSI.
 */
#define d_blind         d_drivedata[0]

#ifndef LOCORE
/*
 * Structure used to perform a format or other raw operation, returning
 * data and/or register values.  Register identification and format
 * are device- and driver-dependent.
 */
struct format_op {
	char    *df_buf;
	int      df_count;              /* value-result */
	daddr_t  df_startblk;
	int      df_reg[8];             /* result */
};

/*
 * Structure used internally to retrieve information about a partition
 * on a disk.
 */
struct partinfo {
	struct disklabel *disklab;
	struct partition *part;
};

/*
 * Disk-specific ioctls.
 */
/* get and set disklabel; DIOCGPART used internally */
#define DIOCGDINFO      _IOR('d', 101, struct disklabel)/* get */
#define DIOCSDINFO      _IOW('d', 102, struct disklabel)/* set */
#define DIOCWDINFO      _IOW('d', 103, struct disklabel)/* set, update disk */
#define DIOCGPART       _IOW('d', 104, struct partinfo) /* get partition */

/* do format operation, read or write */
#define DIOCRFORMAT     _IOWR('d', 105, struct format_op)
#define DIOCWFORMAT     _IOWR('d', 106, struct format_op)

#define DIOCSSTEP       _IOW('d', 107, int)     /* set step rate */
#define DIOCSRETRIES    _IOW('d', 108, int)     /* set # of retries */
#define DIOCWLABEL      _IOW('d', 109, int)     /* write en/disable label */

#define DIOCSBAD        _IOW('d', 110, struct dkbad)    /* set kernel dkbad */

#endif /* LOCORE */

#if !defined(KERNEL) && !defined(LOCORE)

#include <sys/cdefs.h>

__BEGIN_DECLS
struct disklabel *getdiskbyname(const char *);
__END_DECLS

#endif

#endif /* __APPLE_API_OBSOLETE */

#endif /* ! _SYS_DISKLABEL_H_ */