1 /* 2 * (C) Copyright 2001 3 * Hans-Joerg Frieden, Hyperion Entertainment 4 * Hans-JoergF@hyperion-entertainment.com 5 * 6 * See file CREDITS for list of people who contributed to this 7 * project. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of 12 * the License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 22 * MA 02111-1307 USA 23 */ 24 #include <common.h> 25 #include <command.h> 26 #include <ide.h> 27 #include <cmd_disk.h> 28 #include "part_amiga.h" 29 30 #if ((CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI)) && defined(CONFIG_AMIGA_PARTITION) 31 32 #undef AMIGA_DEBUG 33 34 #ifdef AMIGA_DEBUG 35 #define PRINTF(fmt, args...) printf(fmt ,##args) 36 #else 37 #define PRINTF(fmt, args...) 38 #endif 39 40 struct block_header 41 { 42 u32 id; 43 u32 summed_longs; 44 s32 chk_sum; 45 }; 46 47 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE]; 48 static struct rigid_disk_block rdb = {0}; 49 static struct bootcode_block bootcode = {0}; 50 51 /* 52 * Copy a bcpl to a c string 53 */ 54 static void bcpl_strcpy(char *to, char *from) 55 { 56 int len = *from++; 57 58 while (len) 59 { 60 *to++ = *from++; 61 len--; 62 } 63 *to = 0; 64 } 65 66 /* 67 * Print a BCPL String. BCPL strings start with a byte with the length 68 * of the string, and don't contain a terminating nul character 69 */ 70 static void bstr_print(char *string) 71 { 72 int len = *string++; 73 char buffer[256]; 74 int i; 75 76 i = 0; 77 while (len) 78 { 79 buffer[i++] = *string++; 80 len--; 81 } 82 83 buffer[i] = 0; 84 printf("%-10s", buffer); 85 } 86 87 /* 88 * Sum a block. The checksum of a block must end up at zero 89 * to be valid. The chk_sum field is selected so that adding 90 * it yields zero. 91 */ 92 int sum_block(struct block_header *header) 93 { 94 s32 *block = (s32 *)header; 95 u32 i; 96 s32 sum = 0; 97 98 for (i = 0; i < header->summed_longs; i++) 99 sum += *block++; 100 101 return (sum != 0); 102 } 103 104 /* 105 * Print an AmigaOS disk type. Disk types are a four-byte identifier 106 * describing the file system. They are usually written as a three-letter 107 * word followed by a backslash and a version number. For example, 108 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem. 109 * DOS\1 is FFS. 110 */ 111 static void print_disk_type(u32 disk_type) 112 { 113 char buffer[6]; 114 buffer[0] = (disk_type & 0xFF000000)>>24; 115 buffer[1] = (disk_type & 0x00FF0000)>>16; 116 buffer[2] = (disk_type & 0x0000FF00)>>8; 117 buffer[3] = '\\'; 118 buffer[4] = (disk_type & 0x000000FF) + '0'; 119 buffer[5] = 0; 120 printf("%s", buffer); 121 } 122 123 /* 124 * Print the info contained within the given partition block 125 */ 126 static void print_part_info(struct partition_block *p) 127 { 128 struct amiga_part_geometry *g; 129 130 g = (struct amiga_part_geometry *)&(p->environment); 131 132 bstr_print(p->drive_name); 133 printf("%6d\t%6d\t", 134 g->low_cyl * g->block_per_track * g->surfaces , 135 (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1); 136 print_disk_type(g->dos_type); 137 printf("\t%5d\n", g->boot_priority); 138 } 139 140 /* 141 * Search for the Rigid Disk Block. The rigid disk block is required 142 * to be within the first 16 blocks of a drive, needs to have 143 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid 144 * sum-to-zero checksum 145 */ 146 struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc) 147 { 148 int i; 149 int limit; 150 char *s; 151 152 s = getenv("amiga_scanlimit"); 153 if (s) 154 limit = atoi(s); 155 else 156 limit = AMIGA_BLOCK_LIMIT; 157 158 for (i=0; i<limit; i++) 159 { 160 ulong res = dev_desc->block_read(dev_desc->dev, i, 1, 161 (ulong *)block_buffer); 162 if (res == 1) 163 { 164 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer; 165 if (trdb->id == AMIGA_ID_RDISK) 166 { 167 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i); 168 if (sum_block((struct block_header *)block_buffer) == 0) 169 { 170 PRINTF("FOUND\n"); 171 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block)); 172 return (struct rigid_disk_block *)&rdb; 173 } 174 } 175 } 176 } 177 PRINTF("Done scanning, no RDB found\n"); 178 return NULL; 179 } 180 181 /* 182 * Search for boot code 183 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the 184 * Ridgid disk block 185 */ 186 187 struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc) 188 { 189 int i; 190 int limit; 191 char *s; 192 193 s = getenv("amiga_scanlimit"); 194 if (s) 195 limit = atoi(s); 196 else 197 limit = AMIGA_BLOCK_LIMIT; 198 199 PRINTF("Scanning for BOOT from 0 to %d\n", limit); 200 201 for (i = 0; i < limit; i++) 202 { 203 ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer); 204 if (res == 1) 205 { 206 struct bootcode_block *boot = (struct bootcode_block *)block_buffer; 207 if (boot->id == AMIGA_ID_BOOT) 208 { 209 PRINTF("BOOT block at %d, checking checksum\n", i); 210 if (sum_block((struct block_header *)block_buffer) == 0) 211 { 212 PRINTF("Found valid bootcode block\n"); 213 memcpy(&bootcode, boot, sizeof(struct bootcode_block)); 214 return &bootcode; 215 } 216 } 217 } 218 } 219 220 PRINTF("No boot code found on disk\n"); 221 return 0; 222 } 223 224 /* 225 * Test if the given partition has an Amiga partition table/Rigid 226 * Disk block 227 */ 228 int test_part_amiga(block_dev_desc_t *dev_desc) 229 { 230 struct rigid_disk_block *rdb; 231 struct bootcode_block *bootcode; 232 233 PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n"); 234 235 rdb = get_rdisk(dev_desc); 236 if (rdb) 237 { 238 bootcode = get_bootcode(dev_desc); 239 if (bootcode) 240 PRINTF("test_part_amiga: bootable Amiga disk\n"); 241 else 242 PRINTF("test_part_amiga: non-bootable Amiga disk\n"); 243 244 return 0; 245 } 246 else 247 { 248 PRINTF("test_part_amiga: no RDB found\n"); 249 return -1; 250 } 251 252 } 253 254 /* 255 * Find partition number partnum on the given drive. 256 */ 257 static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum) 258 { 259 struct rigid_disk_block *rdb; 260 struct partition_block *p; 261 u32 block; 262 263 PRINTF("Trying to find partition block %d\n", partnum); 264 rdb = get_rdisk(dev_desc); 265 if (!rdb) 266 { 267 PRINTF("find_partition: no rdb found\n"); 268 return NULL; 269 } 270 271 PRINTF("find_partition: Scanning partition list\n"); 272 273 block = rdb->partition_list; 274 PRINTF("find_partition: partition list at 0x%x\n", block); 275 276 while (block != 0xFFFFFFFF) 277 { 278 ulong res = dev_desc->block_read(dev_desc->dev, block, 1, 279 (ulong *)block_buffer); 280 if (res == 1) 281 { 282 p = (struct partition_block *)block_buffer; 283 if (p->id == AMIGA_ID_PART) 284 { 285 PRINTF("PART block suspect at 0x%x, checking checksum\n",block); 286 if (sum_block((struct block_header *)p) == 0) 287 { 288 if (partnum == 0) break; 289 else 290 { 291 partnum--; 292 block = p->next; 293 } 294 } 295 } else block = 0xFFFFFFFF; 296 } else block = 0xFFFFFFFF; 297 } 298 299 if (block == 0xFFFFFFFF) 300 { 301 PRINTF("PART block not found\n"); 302 return NULL; 303 } 304 305 return (struct partition_block *)block_buffer; 306 } 307 308 /* 309 * Get info about a partition 310 */ 311 int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info) 312 { 313 struct partition_block *p = find_partition(dev_desc, part-1); 314 struct amiga_part_geometry *g; 315 u32 disk_type; 316 317 if (!p) return -1; 318 319 g = (struct amiga_part_geometry *)&(p->environment); 320 info->start = g->low_cyl * g->block_per_track * g->surfaces; 321 info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1; 322 info->blksz = rdb.block_bytes; 323 bcpl_strcpy(info->name, p->drive_name); 324 325 326 disk_type = g->dos_type; 327 328 info->type[0] = (disk_type & 0xFF000000)>>24; 329 info->type[1] = (disk_type & 0x00FF0000)>>16; 330 info->type[2] = (disk_type & 0x0000FF00)>>8; 331 info->type[3] = '\\'; 332 info->type[4] = (disk_type & 0x000000FF) + '0'; 333 info->type[5] = 0; 334 335 return 0; 336 } 337 338 void print_part_amiga (block_dev_desc_t *dev_desc) 339 { 340 struct rigid_disk_block *rdb; 341 struct bootcode_block *boot; 342 struct partition_block *p; 343 u32 block; 344 int i = 1; 345 346 rdb = get_rdisk(dev_desc); 347 if (!rdb) 348 { 349 PRINTF("print_part_amiga: no rdb found\n"); 350 return; 351 } 352 353 PRINTF("print_part_amiga: Scanning partition list\n"); 354 355 block = rdb->partition_list; 356 PRINTF("print_part_amiga: partition list at 0x%x\n", block); 357 358 printf("Summary: DiskBlockSize: %d\n" 359 " Cylinders : %d\n" 360 " Sectors/Track: %d\n" 361 " Heads : %d\n\n", 362 rdb->block_bytes, rdb->cylinders, rdb->sectors, 363 rdb->heads); 364 365 printf(" First Num. \n" 366 "Nr. Part. Name Block Block Type Boot Priority\n"); 367 368 while (block != 0xFFFFFFFF) 369 { 370 ulong res; 371 372 PRINTF("Trying to load block #0x%X\n", block); 373 374 res = dev_desc->block_read(dev_desc->dev, block, 1, 375 (ulong *)block_buffer); 376 if (res == 1) 377 { 378 p = (struct partition_block *)block_buffer; 379 if (p->id == AMIGA_ID_PART) 380 { 381 PRINTF("PART block suspect at 0x%x, checking checksum\n",block); 382 if (sum_block((struct block_header *)p) == 0) 383 { 384 printf("%-4d ", i); i++; 385 print_part_info(p); 386 block = p->next; 387 } 388 } else block = 0xFFFFFFFF; 389 } else block = 0xFFFFFFFF; 390 } 391 392 boot = get_bootcode(dev_desc); 393 if (boot) 394 { 395 printf("Disk is bootable\n"); 396 } 397 } 398 399 #endif 400