3 * Hans-Joerg Frieden, Hyperion Entertainment
4 * Hans-JoergF@hyperion-entertainment.com
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
27 #include "part_amiga.h"
29 #ifdef HAVE_BLOCK_DEVICE
34 #define PRINTF(fmt, args...) printf(fmt ,##args)
36 #define PRINTF(fmt, args...)
46 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
47 static struct rigid_disk_block rdb = {0};
48 static struct bootcode_block bootcode = {0};
51 * Copy a bcpl to a c string
53 static void bcpl_strcpy(char *to, char *from)
66 * Print a BCPL String. BCPL strings start with a byte with the length
67 * of the string, and don't contain a terminating nul character
69 static void bstr_print(char *string)
78 buffer[i++] = *string++;
83 printf("%-10s", buffer);
87 * Sum a block. The checksum of a block must end up at zero
88 * to be valid. The chk_sum field is selected so that adding
91 int sum_block(struct block_header *header)
93 s32 *block = (s32 *)header;
97 for (i = 0; i < header->summed_longs; i++)
104 * Print an AmigaOS disk type. Disk types are a four-byte identifier
105 * describing the file system. They are usually written as a three-letter
106 * word followed by a backslash and a version number. For example,
107 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
110 static void print_disk_type(u32 disk_type)
113 buffer[0] = (disk_type & 0xFF000000)>>24;
114 buffer[1] = (disk_type & 0x00FF0000)>>16;
115 buffer[2] = (disk_type & 0x0000FF00)>>8;
117 buffer[4] = (disk_type & 0x000000FF) + '0';
119 printf("%s", buffer);
123 * Print the info contained within the given partition block
125 static void print_part_info(struct partition_block *p)
127 struct amiga_part_geometry *g;
129 g = (struct amiga_part_geometry *)&(p->environment);
131 bstr_print(p->drive_name);
133 g->low_cyl * g->block_per_track * g->surfaces ,
134 (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
135 print_disk_type(g->dos_type);
136 printf("\t%5d\n", g->boot_priority);
140 * Search for the Rigid Disk Block. The rigid disk block is required
141 * to be within the first 16 blocks of a drive, needs to have
142 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
143 * sum-to-zero checksum
145 struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
151 s = getenv("amiga_scanlimit");
153 limit = simple_strtoul(s, NULL, 10);
155 limit = AMIGA_BLOCK_LIMIT;
157 for (i=0; i<limit; i++)
159 ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
160 (ulong *)block_buffer);
163 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
164 if (trdb->id == AMIGA_ID_RDISK)
166 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
167 if (sum_block((struct block_header *)block_buffer) == 0)
170 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
171 return (struct rigid_disk_block *)&rdb;
176 PRINTF("Done scanning, no RDB found\n");
181 * Search for boot code
182 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
186 struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
192 s = getenv("amiga_scanlimit");
194 limit = simple_strtoul(s, NULL, 10);
196 limit = AMIGA_BLOCK_LIMIT;
198 PRINTF("Scanning for BOOT from 0 to %d\n", limit);
200 for (i = 0; i < limit; i++)
202 ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
205 struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
206 if (boot->id == AMIGA_ID_BOOT)
208 PRINTF("BOOT block at %d, checking checksum\n", i);
209 if (sum_block((struct block_header *)block_buffer) == 0)
211 PRINTF("Found valid bootcode block\n");
212 memcpy(&bootcode, boot, sizeof(struct bootcode_block));
219 PRINTF("No boot code found on disk\n");
224 * Test if the given partition has an Amiga partition table/Rigid
227 int test_part_amiga(block_dev_desc_t *dev_desc)
229 struct rigid_disk_block *rdb;
230 struct bootcode_block *bootcode;
232 PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");
234 rdb = get_rdisk(dev_desc);
237 bootcode = get_bootcode(dev_desc);
239 PRINTF("test_part_amiga: bootable Amiga disk\n");
241 PRINTF("test_part_amiga: non-bootable Amiga disk\n");
247 PRINTF("test_part_amiga: no RDB found\n");
254 * Find partition number partnum on the given drive.
256 static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
258 struct rigid_disk_block *rdb;
259 struct partition_block *p;
262 PRINTF("Trying to find partition block %d\n", partnum);
263 rdb = get_rdisk(dev_desc);
266 PRINTF("find_partition: no rdb found\n");
270 PRINTF("find_partition: Scanning partition list\n");
272 block = rdb->partition_list;
273 PRINTF("find_partition: partition list at 0x%x\n", block);
275 while (block != 0xFFFFFFFF)
277 ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
278 (ulong *)block_buffer);
281 p = (struct partition_block *)block_buffer;
282 if (p->id == AMIGA_ID_PART)
284 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
285 if (sum_block((struct block_header *)p) == 0)
287 if (partnum == 0) break;
294 } else block = 0xFFFFFFFF;
295 } else block = 0xFFFFFFFF;
298 if (block == 0xFFFFFFFF)
300 PRINTF("PART block not found\n");
304 return (struct partition_block *)block_buffer;
308 * Get info about a partition
310 int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
312 struct partition_block *p = find_partition(dev_desc, part-1);
313 struct amiga_part_geometry *g;
318 g = (struct amiga_part_geometry *)&(p->environment);
319 info->start = g->low_cyl * g->block_per_track * g->surfaces;
320 info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
321 info->blksz = rdb.block_bytes;
322 bcpl_strcpy(info->name, p->drive_name);
325 disk_type = g->dos_type;
327 info->type[0] = (disk_type & 0xFF000000)>>24;
328 info->type[1] = (disk_type & 0x00FF0000)>>16;
329 info->type[2] = (disk_type & 0x0000FF00)>>8;
330 info->type[3] = '\\';
331 info->type[4] = (disk_type & 0x000000FF) + '0';
337 void print_part_amiga (block_dev_desc_t *dev_desc)
339 struct rigid_disk_block *rdb;
340 struct bootcode_block *boot;
341 struct partition_block *p;
345 rdb = get_rdisk(dev_desc);
348 PRINTF("print_part_amiga: no rdb found\n");
352 PRINTF("print_part_amiga: Scanning partition list\n");
354 block = rdb->partition_list;
355 PRINTF("print_part_amiga: partition list at 0x%x\n", block);
357 printf("Summary: DiskBlockSize: %d\n"
359 " Sectors/Track: %d\n"
361 rdb->block_bytes, rdb->cylinders, rdb->sectors,
364 printf(" First Num. \n"
365 "Nr. Part. Name Block Block Type Boot Priority\n");
367 while (block != 0xFFFFFFFF)
371 PRINTF("Trying to load block #0x%X\n", block);
373 res = dev_desc->block_read(dev_desc->dev, block, 1,
374 (ulong *)block_buffer);
377 p = (struct partition_block *)block_buffer;
378 if (p->id == AMIGA_ID_PART)
380 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
381 if (sum_block((struct block_header *)p) == 0)
383 printf("%-4d ", i); i++;
387 } else block = 0xFFFFFFFF;
388 } else block = 0xFFFFFFFF;
391 boot = get_bootcode(dev_desc);
394 printf("Disk is bootable\n");