Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/scsi/rz_labels.c
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1993,1992,1991,1990,1989 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 /* 27 * HISTORY 28 * $Log: rz_labels.c,v $ 29 * Revision 2.11 93/11/17 18:44:36 dbg 30 * Need to always keep d_partitions[MAXPARTITIONS] correct, so 31 * always reset it ourselves. 32 * [93/10/08 rvb] 33 * 34 * Revision 2.10 93/08/10 15:19:51 mrt 35 * We now use bsd labels internally and convert from "local labels" 36 * if we find them on the disk. 37 * [93/08/03 20:36:46 rvb] 38 * 39 * Revision 2.9 93/05/10 21:22:41 rvb 40 * Removed depends on DEV_BSIZE. 41 * [93/05/06 10:09:09 af] 42 * 43 * Revision 2.8 93/03/09 11:18:35 danner 44 * If there is no recognizable label, we must set p_size of the 45 * MAXPARTITION slice. We use MAXPARTITION to do ABSOLUTE reads. 46 * [93/02/23 rvb] 47 * 48 * Revision 2.7 92/08/03 17:53:58 jfriedl 49 * removed silly prototypes 50 * [92/08/02 jfriedl] 51 * 52 * Revision 2.6 92/05/21 17:23:47 jfriedl 53 * tried prototypes. 54 * [92/05/20 jfriedl] 55 * 56 * Revision 2.5 92/04/03 12:10:09 rpd 57 * Let "grab_bob_label" return failure so we take the default. 58 * [92/04/01 rvb] 59 * 60 * Revision 2.4 92/02/23 22:44:31 elf 61 * Actually, scan for all possible (bogus) label formats. 62 * This makes it possible to cross-mount disks even if 63 * they do not have the standard BSD label. 64 * [92/02/22 af] 65 * 66 * Revision 2.3 91/08/24 12:28:06 af 67 * Created, splitting out DEC-specific code from rz_disk.c and 68 * adding some more. 69 * [91/06/26 af] 70 * 71 */ 72 /* 73 * File: rz_labels.c 74 * Author: Alessandro Forin, Carnegie Mellon University 75 * Date: 6/91 76 * 77 * Routines for various vendor's disk label formats. 78 */ 79 80 #include <platforms.h> 81 82 #include <mach/std_types.h> 83 #include <kern/memory.h> 84 #include <scsi/compat_30.h> 85 #include <scsi/scsi_defs.h> 86 #include <scsi/rz_labels.h> 87 88 #define LABEL_DEBUG(x,y) if (label_flag&x) y 89 90 91 /* 92 * Find and convert from a DEC label to BSD 93 */ 94 boolean_t 95 rz_dec_label( 96 target_info_t *tgt, 97 struct disklabel *label, 98 io_req_t ior) 99 { 100 /* here look for a DEC label */ 101 register scsi_dec_label_t *part; 102 char *data; 103 int i, dev_bsize = tgt->block_size; 104 105 ior->io_count = dev_bsize; 106 ior->io_op = IO_READ; 107 tgt->ior = ior; 108 scdisk_read( tgt, DEC_LABEL_BYTE_OFFSET/dev_bsize, ior); 109 iowait(ior); 110 data = (char *)ior->io_data; 111 part = (scsi_dec_label_t*)&data[DEC_LABEL_BYTE_OFFSET%dev_bsize]; 112 if (part->magic == DEC_LABEL_MAGIC) { 113 if (scsi_debug) 114 printf("{Using DEC label}"); 115 for (i = 0; i < 8; i++) { 116 label->d_partitions[i].p_size = part->partitions[i].n_sectors; 117 label->d_partitions[i].p_offset = part->partitions[i].offset; 118 } 119 return TRUE; 120 } 121 return FALSE; 122 } 123 124 /* 125 * Find and convert from a Omron label to BSD 126 */ 127 boolean_t 128 rz_omron_label( 129 target_info_t *tgt, 130 struct disklabel *label, 131 io_req_t ior) 132 { 133 /* here look for an Omron label */ 134 register scsi_omron_label_t *part; 135 char *data; 136 int i, dev_bsize = tgt->block_size; 137 138 ior->io_count = dev_bsize; 139 ior->io_op = IO_READ; 140 tgt->ior = ior; 141 scdisk_read( tgt, OMRON_LABEL_BYTE_OFFSET/dev_bsize, ior); 142 iowait(ior); 143 data = (char *)ior->io_data; 144 part = (scsi_omron_label_t*)&data[OMRON_LABEL_BYTE_OFFSET%dev_bsize]; 145 if (part->magic == OMRON_LABEL_MAGIC) { 146 if (scsi_debug) 147 printf("{Using OMRON label}"); 148 for (i = 0; i < 8; i++) { 149 label->d_partitions[i].p_size = part->partitions[i].n_sectors; 150 label->d_partitions[i].p_offset = part->partitions[i].offset; 151 } 152 bcopy(part->packname, label->d_packname, 16); 153 label->d_ncylinders = part->ncyl; 154 label->d_acylinders = part->acyl; 155 label->d_ntracks = part->nhead; 156 label->d_nsectors = part->nsect; 157 /* Many disks have this wrong, therefore.. */ 158 #if 0 159 label->d_secperunit = part->maxblk; 160 #else 161 label->d_secperunit = label->d_ncylinders * label->d_ntracks * 162 label->d_nsectors; 163 #endif 164 return TRUE; 165 } 166 return FALSE; 167 } 168 169 /* 170 * Find and convert from a Intel BIOS label to BSD 171 */ 172 extern int label_flag; 173 extern int OS; 174 #define BSDOS 165 175 #define LBLLOC 1 176 177 boolean_t 178 rz_bios_bsd_label( 179 target_info_t *tgt, 180 struct disklabel *label, 181 io_req_t ior, 182 struct bios_partition_info *ospart) 183 { 184 struct disklabel *dlp; 185 int dev_bsize = tgt->block_size; 186 int i; 187 extern int allow_bsd_label; 188 189 ior->io_count = dev_bsize; 190 ior->io_op = IO_READ; 191 tgt->ior = ior; 192 scdisk_read( tgt, (ospart->offset + LBLLOC) * 512 / dev_bsize, ior); 193 iowait(ior); 194 dlp = (struct disklabel *)ior->io_data; 195 196 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 197 if (OS == BSDOS) { 198 printf("NO BSD LABEL!!\n"); 199 } 200 return FALSE; 201 } 202 203 printf("BSD LABEL "); 204 LABEL_DEBUG(2,print_bsd_label(dlp, "dk:")); 205 /* 206 * here's where we dump label 207 */ 208 if (allow_bsd_label == 0) 209 return FALSE; 210 211 i = label->d_secperunit; 212 *label = *dlp; 213 label->d_secperunit = i; 214 /* 215 * The disklabel program should insure the invariant below 216 * when it writes a label. But it does not seem to. 217 */ 218 label->d_partitions[MAXPARTITIONS].p_size = -1; 219 label->d_partitions[MAXPARTITIONS].p_offset = 0; 220 label->d_checksum = dkcksum(label); 221 222 tgt->dev_info.disk.labeloffset = 0; 223 tgt->dev_info.disk.labelsector = (ospart->offset + LBLLOC) * 512 / dev_bsize; 224 225 LABEL_DEBUG(0x20,print_bsd_label(dlp, " ")); 226 return TRUE; 227 } 228 229 boolean_t 230 rz_bios_label( 231 target_info_t *tgt, 232 struct disklabel *label, 233 io_req_t ior) 234 { 235 /* here look for a BIOS label */ 236 char *data; 237 int i, dev_bsize = tgt->block_size; 238 scsi_bios_label_t part; 239 240 ior->io_count = dev_bsize; 241 ior->io_op = IO_READ; 242 tgt->ior = ior; 243 scdisk_read( tgt, BIOS_LABEL_BYTE_OFFSET/dev_bsize, ior); 244 iowait(ior); 245 data = (char *)ior->io_data; 246 /* 247 * It's safer to just copy the data here and not worry about 248 * scdisk_read's down the line will clobber the buffer. 249 */ 250 part = *(scsi_bios_label_t*)&data[BIOS_LABEL_BYTE_OFFSET%dev_bsize]; 251 if (((scsi_bios_label_t*)&data[BIOS_LABEL_BYTE_OFFSET%dev_bsize])->magic 252 == BIOS_LABEL_MAGIC) { 253 struct bios_partition_info *bpart, *ospart = (struct bios_partition_info *)0; 254 if (scsi_debug) 255 printf("{Using BIOS label}"); 256 for (i = 0; i < 4; i++) { 257 bpart = &(((struct bios_partition_info *)part.partitions)[i]); 258 LABEL_DEBUG(1,print_dos_partition(i, bpart)); 259 label->d_partitions[i].p_size = bpart->n_sectors; 260 label->d_partitions[i].p_offset = bpart->offset; 261 if (bpart->systid == UNIXOS || bpart->systid == BSDOS) { 262 if (ospart != 0) { 263 if (bpart->bootid == BIOS_BOOTABLE) 264 ospart = bpart; 265 } else 266 ospart = bpart; 267 } 268 } 269 tgt->dev_info.disk.l.d_partitions[MAXPARTITIONS].p_offset= 0; 270 tgt->dev_info.disk.l.d_partitions[MAXPARTITIONS].p_size = -1; 271 272 if (ospart == 0) 273 return FALSE; 274 OS = ospart->systid; 275 if (OS == UNIXOS) 276 printf("sd%d: MACH OS ", tgt->target_id); 277 if (OS == BSDOS) 278 printf("sd%d: XXXBSD OS ", tgt->target_id); 279 280 if (rz_bios_bsd_label(tgt, label, ior, ospart)) 281 return TRUE; 282 283 #ifdef AT386 /* this goes away real fast */ 284 if (!grab_bob_label(tgt, label, ior, 285 ((struct bios_partition_info *)part.partitions))) 286 return FALSE; /* take default setup of "a" and "c" */ 287 #else 288 label->d_npartitions = 4; 289 #endif 290 label->d_bbsize = BIOS_BOOT0_SIZE; 291 return TRUE; 292 } 293 return FALSE; 294 } 295 296 /* 297 * Try all of the above 298 */ 299 boolean_t rz_vendor_label( 300 target_info_t *tgt, 301 struct disklabel *label, 302 io_req_t ior) 303 { 304 /* If for any reason there might be problems someday.. */ 305 #ifdef VENDOR_LABEL 306 if (VENDOR_LABEL( tgt, label, ior)) return TRUE; 307 #endif /*VENDOR_LABEL*/ 308 309 if (rz_dec_label( tgt, label, ior)) return TRUE; 310 if (rz_bios_label( tgt, label, ior)) return TRUE; 311 if (rz_omron_label( tgt, label, ior)) return TRUE; 312 return FALSE; 313 } 314
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