disk/part_amiga.c

   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 "part_amiga.h"
  28
  29 #if (defined(CONFIG_CMD_IDE) || \
  30      defined(CONFIG_CMD_SCSI) || \
  31      defined(CONFIG_CMD_USB) || \
  32      defined(CONFIG_MMC) || \
  33      defined(CONFIG_SYSTEMACE) ) && defined(CONFIG_AMIGA_PARTITION)
  34
  35 #undef AMIGA_DEBUG
  36
  37 #ifdef AMIGA_DEBUG
  38 #define PRINTF(fmt, args...) printf(fmt ,##args)
  39 #else
  40 #define PRINTF(fmt, args...)
  41 #endif
  42
  43 struct block_header
  44 {
  45     u32 id;
  46     u32 summed_longs;
  47     s32 chk_sum;
  48 };
  49
  50 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
  51 static struct rigid_disk_block rdb = {0};
  52 static struct bootcode_block bootcode = {0};
  53
  54 /*
  55  * Copy a bcpl to a c string
  56  */
  57 static void bcpl_strcpy(char *to, char *from)
  58 {
  59     int len = *from++;
  60
  61     while (len)
  62     {
  63         *to++ = *from++;
  64         len--;
  65     }
  66     *to = 0;
  67 }
  68
  69 /*
  70  * Print a BCPL String. BCPL strings start with a byte with the length
  71  * of the string, and don't contain a terminating nul character
  72  */
  73 static void bstr_print(char *string)
  74 {
  75     int len = *string++;
  76     char buffer[256];
  77     int i;
  78
  79     i = 0;
  80     while (len)
  81     {
  82         buffer[i++] = *string++;
  83         len--;
  84     }
  85
  86     buffer[i] = 0;
  87     printf("%-10s", buffer);
  88 }
  89
  90 /*
  91  * Sum a block. The checksum of a block must end up at zero
  92  * to be valid. The chk_sum field is selected so that adding
  93  * it yields zero.
  94  */
  95 int sum_block(struct block_header *header)
  96 {
  97     s32 *block = (s32 *)header;
  98     u32 i;
  99     s32 sum = 0;
 100
 101     for (i = 0; i < header->summed_longs; i++)
 102         sum += *block++;
 103
 104     return (sum != 0);
 105 }
 106
 107 /*
 108  * Print an AmigaOS disk type. Disk types are a four-byte identifier
 109  * describing the file system. They are usually written as a three-letter
 110  * word followed by a backslash and a version number. For example,
 111  * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
 112  * DOS\1 is FFS.
 113  */
 114 static void print_disk_type(u32 disk_type)
 115 {
 116     char buffer[6];
 117     buffer[0] = (disk_type & 0xFF000000)>>24;
 118     buffer[1] = (disk_type & 0x00FF0000)>>16;
 119     buffer[2] = (disk_type & 0x0000FF00)>>8;
 120     buffer[3] = '\\';
 121     buffer[4] = (disk_type & 0x000000FF) + '0';
 122     buffer[5] = 0;
 123     printf("%s", buffer);
 124 }
 125
 126 /*
 127  * Print the info contained within the given partition block
 128  */
 129 static void print_part_info(struct partition_block *p)
 130 {
 131     struct amiga_part_geometry *g;
 132
 133     g = (struct amiga_part_geometry *)&(p->environment);
 134
 135     bstr_print(p->drive_name);
 136     printf("%6d\t%6d\t",
 137            g->low_cyl * g->block_per_track * g->surfaces ,
 138            (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
 139     print_disk_type(g->dos_type);
 140     printf("\t%5d\n", g->boot_priority);
 141 }
 142
 143 /*
 144  * Search for the Rigid Disk Block. The rigid disk block is required
 145  * to be within the first 16 blocks of a drive, needs to have
 146  * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
 147  * sum-to-zero checksum
 148  */
 149 struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
 150 {
 151     int i;
 152     int limit;
 153     char *s;
 154
 155     s = getenv("amiga_scanlimit");
 156     if (s)
 157         limit = atoi(s);
 158     else
 159         limit = AMIGA_BLOCK_LIMIT;
 160
 161     for (i=0; i<limit; i++)
 162     {
 163         ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
 164                                          (ulong *)block_buffer);
 165         if (res == 1)
 166         {
 167             struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
 168             if (trdb->id == AMIGA_ID_RDISK)
 169             {
 170                 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
 171                 if (sum_block((struct block_header *)block_buffer) == 0)
 172                 {
 173                     PRINTF("FOUND\n");
 174                     memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
 175                     return (struct rigid_disk_block *)&rdb;
 176                 }
 177             }
 178         }
 179     }
 180     PRINTF("Done scanning, no RDB found\n");
 181     return NULL;
 182 }
 183
 184 /*
 185  * Search for boot code
 186  * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
 187  * Ridgid disk block
 188  */
 189
 190 struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
 191 {
 192     int i;
 193     int limit;
 194     char *s;
 195
 196     s = getenv("amiga_scanlimit");
 197     if (s)
 198         limit = atoi(s);
 199     else
 200         limit = AMIGA_BLOCK_LIMIT;
 201
 202     PRINTF("Scanning for BOOT from 0 to %d\n", limit);
 203
 204     for (i = 0; i < limit; i++)
 205     {
 206         ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
 207         if (res == 1)
 208         {
 209             struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
 210             if (boot->id == AMIGA_ID_BOOT)
 211             {
 212                 PRINTF("BOOT block at %d, checking checksum\n", i);
 213                 if (sum_block((struct block_header *)block_buffer) == 0)
 214                 {
 215                     PRINTF("Found valid bootcode block\n");
 216                     memcpy(&bootcode, boot, sizeof(struct bootcode_block));
 217                     return &bootcode;
 218                 }
 219             }
 220         }
 221     }
 222
 223     PRINTF("No boot code found on disk\n");
 224     return 0;
 225 }
 226
 227 /*
 228  * Test if the given partition has an Amiga partition table/Rigid
 229  * Disk block
 230  */
 231 int test_part_amiga(block_dev_desc_t *dev_desc)
 232 {
 233     struct rigid_disk_block *rdb;
 234     struct bootcode_block *bootcode;
 235
 236     PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");
 237
 238     rdb = get_rdisk(dev_desc);
 239     if (rdb)
 240     {
 241         bootcode = get_bootcode(dev_desc);
 242         if (bootcode)
 243             PRINTF("test_part_amiga: bootable Amiga disk\n");
 244         else
 245             PRINTF("test_part_amiga: non-bootable Amiga disk\n");
 246
 247         return 0;
 248     }
 249     else
 250     {
 251         PRINTF("test_part_amiga: no RDB found\n");
 252         return -1;
 253     }
 254
 255 }
 256
 257 /*
 258  * Find partition number partnum on the given drive.
 259  */
 260 static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
 261 {
 262     struct rigid_disk_block *rdb;
 263     struct partition_block *p;
 264     u32 block;
 265
 266     PRINTF("Trying to find partition block %d\n", partnum);
 267     rdb = get_rdisk(dev_desc);
 268     if (!rdb)
 269     {
 270         PRINTF("find_partition: no rdb found\n");
 271         return NULL;
 272     }
 273
 274     PRINTF("find_partition: Scanning partition list\n");
 275
 276     block = rdb->partition_list;
 277     PRINTF("find_partition: partition list at 0x%x\n", block);
 278
 279     while (block != 0xFFFFFFFF)
 280     {
 281         ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
 282                                          (ulong *)block_buffer);
 283         if (res == 1)
 284         {
 285             p = (struct partition_block *)block_buffer;
 286             if (p->id == AMIGA_ID_PART)
 287             {
 288                 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
 289                 if (sum_block((struct block_header *)p) == 0)
 290                 {
 291                     if (partnum == 0) break;
 292                     else
 293                     {
 294                         partnum--;
 295                         block = p->next;
 296                     }
 297                 }
 298             } else block = 0xFFFFFFFF;
 299         } else block = 0xFFFFFFFF;
 300     }
 301
 302     if (block == 0xFFFFFFFF)
 303     {
 304         PRINTF("PART block not found\n");
 305         return NULL;
 306     }
 307
 308     return (struct partition_block *)block_buffer;
 309 }
 310
 311 /*
 312  * Get info about a partition
 313  */
 314 int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
 315 {
 316     struct partition_block *p = find_partition(dev_desc, part-1);
 317     struct amiga_part_geometry *g;
 318     u32 disk_type;
 319
 320     if (!p) return -1;
 321
 322     g = (struct amiga_part_geometry *)&(p->environment);
 323     info->start = g->low_cyl  * g->block_per_track * g->surfaces;
 324     info->size  = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
 325     info->blksz = rdb.block_bytes;
 326     bcpl_strcpy(info->name, p->drive_name);
 327
 328
 329     disk_type = g->dos_type;
 330
 331     info->type[0] = (disk_type & 0xFF000000)>>24;
 332     info->type[1] = (disk_type & 0x00FF0000)>>16;
 333     info->type[2] = (disk_type & 0x0000FF00)>>8;
 334     info->type[3] = '\\';
 335     info->type[4] = (disk_type & 0x000000FF) + '0';
 336     info->type[5] = 0;
 337
 338     return 0;
 339 }
 340
 341 void print_part_amiga (block_dev_desc_t *dev_desc)
 342 {
 343     struct rigid_disk_block *rdb;
 344     struct bootcode_block *boot;
 345     struct partition_block *p;
 346     u32 block;
 347     int i = 1;
 348
 349     rdb = get_rdisk(dev_desc);
 350     if (!rdb)
 351     {
 352         PRINTF("print_part_amiga: no rdb found\n");
 353         return;
 354     }
 355
 356     PRINTF("print_part_amiga: Scanning partition list\n");
 357
 358     block = rdb->partition_list;
 359     PRINTF("print_part_amiga: partition list at 0x%x\n", block);
 360
 361     printf("Summary:  DiskBlockSize: %d\n"
 362            "          Cylinders    : %d\n"
 363            "          Sectors/Track: %d\n"
 364            "          Heads        : %d\n\n",
 365            rdb->block_bytes, rdb->cylinders, rdb->sectors,
 366            rdb->heads);
 367
 368     printf("                 First   Num. \n"
 369            "Nr.  Part. Name  Block   Block  Type        Boot Priority\n");
 370
 371     while (block != 0xFFFFFFFF)
 372     {
 373         ulong res;
 374
 375         PRINTF("Trying to load block #0x%X\n", block);
 376
 377         res = dev_desc->block_read(dev_desc->dev, block, 1,
 378                                    (ulong *)block_buffer);
 379         if (res == 1)
 380         {
 381             p = (struct partition_block *)block_buffer;
 382             if (p->id == AMIGA_ID_PART)
 383             {
 384                 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
 385                 if (sum_block((struct block_header *)p) == 0)
 386                 {
 387                     printf("%-4d ", i); i++;
 388                     print_part_info(p);
 389                     block = p->next;
 390                 }
 391             } else block = 0xFFFFFFFF;
 392         } else block = 0xFFFFFFFF;
 393     }
 394
 395     boot = get_bootcode(dev_desc);
 396     if (boot)
 397     {
 398         printf("Disk is bootable\n");
 399     }
 400 }
 401
 402 #endif