1 /* 2 * Copyright (c) 1987, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)disklabel.h 8.2 (Berkeley) 7/10/94 30 * $FreeBSD: src/sys/sys/disklabel.h,v 1.49.2.7 2001/05/27 05:58:26 jkh Exp $ 31 * $DragonFly: src/sys/sys/disklabel32.h,v 1.28 2007/08/21 20:04:09 corecode Exp $ 32 */ 33 34 #ifndef _SYS_DISKLABEL32_H_ 35 #define _SYS_DISKLABEL32_H_ 36 37 #ifndef _SYS_TYPES_H_ 38 #include <sys/types.h> 39 #endif 40 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_) 41 #include <sys/systm.h> 42 #endif 43 #ifndef _SYS_IOCCOM_H_ 44 #include <sys/ioccom.h> 45 #endif 46 47 /* 48 * Each disk has a label which includes information about the hardware 49 * disk geometry, filesystem partitions, and drive specific information. 50 * The label is in block 0 or 1, possibly offset from the beginning 51 * to leave room for a bootstrap, etc. 52 */ 53 54 /* XXX these should be defined per controller (or drive) elsewhere, not here! */ 55 #if defined(__i386__) /* used in sys/boot */ || defined(__x86_64__) 56 #define LABELSECTOR32 1 /* sector containing label */ 57 #define LABELOFFSET32 0 /* offset of label in sector */ 58 #endif 59 60 #define DISKMAGIC32 ((u_int32_t)0x82564557) /* The disk magic number */ 61 #ifndef MAXPARTITIONS32 62 #define MAXPARTITIONS32 16 63 #endif 64 65 #define LABEL_PART 2 /* partition containing label */ 66 #define RAW_PART 2 /* partition containing whole disk */ 67 #define SWAP_PART 1 /* partition normally containing swap */ 68 69 #ifndef LOCORE 70 struct disklabel32 { 71 u_int32_t d_magic; /* the magic number */ 72 u_int16_t d_type; /* drive type */ 73 u_int16_t d_subtype; /* controller/d_type specific */ 74 char d_typename[16]; /* type name, e.g. "eagle" */ 75 76 char d_packname[16]; /* pack identifier */ 77 78 /* disk geometry: */ 79 u_int32_t d_secsize; /* # of bytes per sector */ 80 u_int32_t d_nsectors; /* # of data sectors per track */ 81 u_int32_t d_ntracks; /* # of tracks per cylinder */ 82 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 83 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 84 u_int32_t d_secperunit; /* # of data sectors per unit */ 85 86 /* 87 * Spares (bad sector replacements) below are not counted in 88 * d_nsectors or d_secpercyl. Spare sectors are assumed to 89 * be physical sectors which occupy space at the end of each 90 * track and/or cylinder. 91 */ 92 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 93 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 94 /* 95 * Alternate cylinders include maintenance, replacement, configuration 96 * description areas, etc. 97 */ 98 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 99 100 /* hardware characteristics: */ 101 /* 102 * d_interleave, d_trackskew and d_cylskew describe perturbations 103 * in the media format used to compensate for a slow controller. 104 * Interleave is physical sector interleave, set up by the 105 * formatter or controller when formatting. When interleaving is 106 * in use, logically adjacent sectors are not physically 107 * contiguous, but instead are separated by some number of 108 * sectors. It is specified as the ratio of physical sectors 109 * traversed per logical sector. Thus an interleave of 1:1 110 * implies contiguous layout, while 2:1 implies that logical 111 * sector 0 is separated by one sector from logical sector 1. 112 * d_trackskew is the offset of sector 0 on track N relative to 113 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 114 * is the offset of sector 0 on cylinder N relative to sector 0 115 * on cylinder N-1. 116 */ 117 u_int16_t d_rpm; /* rotational speed */ 118 u_int16_t d_interleave; /* hardware sector interleave */ 119 u_int16_t d_trackskew; /* sector 0 skew, per track */ 120 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 121 u_int32_t d_headswitch; /* head switch time, usec */ 122 u_int32_t d_trkseek; /* track-to-track seek, usec */ 123 u_int32_t d_flags; /* generic flags (now unused) */ 124 #define NDDATA32 5 125 u_int32_t d_drivedata[NDDATA32];/* drive-type specific information */ 126 #define NSPARE32 5 127 u_int32_t d_spare[NSPARE32]; /* reserved for future use */ 128 u_int32_t d_magic2; /* the magic number (again) */ 129 u_int16_t d_checksum; /* xor of data incl. partitions */ 130 131 /* filesystem and partition information: */ 132 u_int16_t d_npartitions; /* number of partitions in following */ 133 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 134 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 135 struct partition32 { /* the partition table */ 136 u_int32_t p_size; /* number of sectors in partition */ 137 u_int32_t p_offset; /* starting sector */ 138 u_int32_t p_fsize; /* filesystem basic fragment size */ 139 u_int8_t p_fstype; /* filesystem type, see below */ 140 u_int8_t p_frag; /* filesystem fragments per block */ 141 union { 142 u_int16_t cpg; /* UFS: FS cylinders per group */ 143 u_int16_t sgs; /* LFS: FS segment shift */ 144 } __partition_u1; 145 #define p_cpg __partition_u1.cpg 146 #define p_sgs __partition_u1.sgs 147 } d_partitions[MAXPARTITIONS32];/* actually may be more */ 148 }; 149 150 static u_int16_t dkcksum32(struct disklabel32 *lp); 151 152 static __inline u_int16_t 153 dkcksum32(struct disklabel32 *lp) 154 { 155 u_int16_t *start, *end; 156 u_int16_t sum = 0; 157 158 start = (u_int16_t *)lp; 159 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 160 while (start < end) 161 sum ^= *start++; 162 return (sum); 163 } 164 165 #ifdef _KERNEL 166 extern struct disklabel_ops disklabel32_ops; 167 #endif 168 169 #else /* LOCORE */ 170 /* 171 * offsets for asm boot files. 172 */ 173 .set d_secsize,40 174 .set d_nsectors,44 175 .set d_ntracks,48 176 .set d_ncylinders,52 177 .set d_secpercyl,56 178 .set d_secperunit,60 179 .set d_end_,276 /* size of disk label */ 180 #endif /* LOCORE */ 181 182 #ifndef LOCORE 183 184 /* 185 * Disk-specific ioctls. 186 */ 187 #define DIOCGDINFO32 _IOR('d', 101, struct disklabel32) /* get */ 188 #define DIOCSDINFO32 _IOW('d', 102, struct disklabel32) /* set */ 189 #define DIOCWDINFO32 _IOW('d', 103, struct disklabel32) /* set, update disk */ 190 #define DIOCGDVIRGIN32 _IOR('d', 105, struct disklabel32) /* get virgin label */ 191 192 #endif /* LOCORE */ 193 194 #endif /* !_SYS_DISKLABEL32_H_ */ 195