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 */ 32 33 #ifndef _SYS_DISKLABEL32_H_ 34 #define _SYS_DISKLABEL32_H_ 35 36 #ifndef _SYS_TYPES_H_ 37 #include <sys/types.h> 38 #endif 39 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_) 40 #include <sys/systm.h> 41 #endif 42 #ifndef _SYS_IOCCOM_H_ 43 #include <sys/ioccom.h> 44 #endif 45 46 /* 47 * Each disk has a label which includes information about the hardware 48 * disk geometry, filesystem partitions, and drive specific information. 49 * The label is in block 0 or 1, possibly offset from the beginning 50 * to leave room for a bootstrap, etc. 51 */ 52 53 /* XXX these should be defined per controller (or drive) elsewhere, not here! */ 54 #if defined(__i386__) /* used in sys/boot */ || defined(__x86_64__) 55 #define LABELSECTOR32 1 /* sector containing label */ 56 #define LABELOFFSET32 0 /* offset of label in sector */ 57 #endif 58 59 #define DISKMAGIC32 ((u_int32_t)0x82564557) /* The disk magic number */ 60 #ifndef MAXPARTITIONS32 61 #define MAXPARTITIONS32 16 62 #endif 63 64 #define LABEL_PART 2 /* partition containing label */ 65 #define RAW_PART 2 /* partition containing whole disk */ 66 #define SWAP_PART 1 /* partition normally containing swap */ 67 68 #ifndef LOCORE 69 struct disklabel32 { 70 u_int32_t d_magic; /* the magic number */ 71 u_int16_t d_type; /* drive type */ 72 u_int16_t d_subtype; /* controller/d_type specific */ 73 char d_typename[16]; /* type name, e.g. "eagle" */ 74 75 char d_packname[16]; /* pack identifier */ 76 77 /* disk geometry: */ 78 u_int32_t d_secsize; /* # of bytes per sector */ 79 u_int32_t d_nsectors; /* # of data sectors per track */ 80 u_int32_t d_ntracks; /* # of tracks per cylinder */ 81 u_int32_t d_ncylinders; /* # of data cylinders per unit */ 82 u_int32_t d_secpercyl; /* # of data sectors per cylinder */ 83 u_int32_t d_secperunit; /* # of data sectors per unit */ 84 85 /* 86 * Spares (bad sector replacements) below are not counted in 87 * d_nsectors or d_secpercyl. Spare sectors are assumed to 88 * be physical sectors which occupy space at the end of each 89 * track and/or cylinder. 90 */ 91 u_int16_t d_sparespertrack; /* # of spare sectors per track */ 92 u_int16_t d_sparespercyl; /* # of spare sectors per cylinder */ 93 /* 94 * Alternate cylinders include maintenance, replacement, configuration 95 * description areas, etc. 96 */ 97 u_int32_t d_acylinders; /* # of alt. cylinders per unit */ 98 99 /* hardware characteristics: */ 100 /* 101 * d_interleave, d_trackskew and d_cylskew describe perturbations 102 * in the media format used to compensate for a slow controller. 103 * Interleave is physical sector interleave, set up by the 104 * formatter or controller when formatting. When interleaving is 105 * in use, logically adjacent sectors are not physically 106 * contiguous, but instead are separated by some number of 107 * sectors. It is specified as the ratio of physical sectors 108 * traversed per logical sector. Thus an interleave of 1:1 109 * implies contiguous layout, while 2:1 implies that logical 110 * sector 0 is separated by one sector from logical sector 1. 111 * d_trackskew is the offset of sector 0 on track N relative to 112 * sector 0 on track N-1 on the same cylinder. Finally, d_cylskew 113 * is the offset of sector 0 on cylinder N relative to sector 0 114 * on cylinder N-1. 115 */ 116 u_int16_t d_rpm; /* rotational speed */ 117 u_int16_t d_interleave; /* hardware sector interleave */ 118 u_int16_t d_trackskew; /* sector 0 skew, per track */ 119 u_int16_t d_cylskew; /* sector 0 skew, per cylinder */ 120 u_int32_t d_headswitch; /* head switch time, usec */ 121 u_int32_t d_trkseek; /* track-to-track seek, usec */ 122 u_int32_t d_flags; /* generic flags (now unused) */ 123 #define NDDATA32 5 124 u_int32_t d_drivedata[NDDATA32];/* drive-type specific information */ 125 #define NSPARE32 5 126 u_int32_t d_spare[NSPARE32]; /* reserved for future use */ 127 u_int32_t d_magic2; /* the magic number (again) */ 128 u_int16_t d_checksum; /* xor of data incl. partitions */ 129 130 /* filesystem and partition information: */ 131 u_int16_t d_npartitions; /* number of partitions in following */ 132 u_int32_t d_bbsize; /* size of boot area at sn0, bytes */ 133 u_int32_t d_sbsize; /* max size of fs superblock, bytes */ 134 struct partition32 { /* the partition table */ 135 u_int32_t p_size; /* number of sectors in partition */ 136 u_int32_t p_offset; /* starting sector */ 137 u_int32_t p_fsize; /* filesystem basic fragment size */ 138 u_int8_t p_fstype; /* filesystem type, see below */ 139 u_int8_t p_frag; /* filesystem fragments per block */ 140 union { 141 u_int16_t cpg; /* UFS: FS cylinders per group */ 142 u_int16_t sgs; /* LFS: FS segment shift */ 143 } __partition_u1; 144 #define p_cpg __partition_u1.cpg 145 #define p_sgs __partition_u1.sgs 146 } d_partitions[MAXPARTITIONS32];/* actually may be more */ 147 }; 148 149 static u_int16_t dkcksum32(struct disklabel32 *lp); 150 151 static __inline u_int16_t 152 dkcksum32(struct disklabel32 *lp) 153 { 154 u_int16_t *start, *end; 155 u_int16_t sum = 0; 156 157 start = (u_int16_t *)lp; 158 end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions]; 159 while (start < end) 160 sum ^= *start++; 161 return (sum); 162 } 163 164 #ifdef _KERNEL 165 extern struct disklabel_ops disklabel32_ops; 166 #endif 167 168 #else /* LOCORE */ 169 /* 170 * offsets for asm boot files. 171 */ 172 .set d_secsize,40 173 .set d_nsectors,44 174 .set d_ntracks,48 175 .set d_ncylinders,52 176 .set d_secpercyl,56 177 .set d_secperunit,60 178 .set d_end_,276 /* size of disk label */ 179 #endif /* !LOCORE */ 180 181 #ifndef LOCORE 182 183 /* 184 * Disk-specific ioctls. 185 */ 186 #define DIOCGDINFO32 _IOR('d', 101, struct disklabel32) /* get */ 187 #define DIOCSDINFO32 _IOW('d', 102, struct disklabel32) /* set */ 188 #define DIOCWDINFO32 _IOW('d', 103, struct disklabel32) /* set, update disk */ 189 #define DIOCGDVIRGIN32 _IOR('d', 105, struct disklabel32) /* get virgin label */ 190 191 #endif /* !LOCORE */ 192 193 #endif /* !_SYS_DISKLABEL32_H_ */ 194