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_MG_DISK) || \
31 defined(CONFIG_CMD_SCSI) || \
32 defined(CONFIG_CMD_USB) || \
33 defined(CONFIG_MMC) || \
34 defined(CONFIG_SYSTEMACE)
35
36 #undef AMIGA_DEBUG
37
38 #ifdef AMIGA_DEBUG
39 #define PRINTF(fmt, args...) printf(fmt ,##args)
40 #else
41 #define PRINTF(fmt, args...)
42 #endif
43
44 struct block_header
45 {
46 u32 id;
47 u32 summed_longs;
48 s32 chk_sum;
49 };
50
51 static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
52 static struct rigid_disk_block rdb = {0};
53 static struct bootcode_block bootcode = {0};
54
55 /*
56 * Copy a bcpl to a c string
57 */
bcpl_strcpy(char * to,char * from)58 static void bcpl_strcpy(char *to, char *from)
59 {
60 int len = *from++;
61
62 while (len)
63 {
64 *to++ = *from++;
65 len--;
66 }
67 *to = 0;
68 }
69
70 /*
71 * Print a BCPL String. BCPL strings start with a byte with the length
72 * of the string, and don't contain a terminating nul character
73 */
bstr_print(char * string)74 static void bstr_print(char *string)
75 {
76 int len = *string++;
77 char buffer[256];
78 int i;
79
80 i = 0;
81 while (len)
82 {
83 buffer[i++] = *string++;
84 len--;
85 }
86
87 buffer[i] = 0;
88 printf("%-10s", buffer);
89 }
90
91 /*
92 * Sum a block. The checksum of a block must end up at zero
93 * to be valid. The chk_sum field is selected so that adding
94 * it yields zero.
95 */
sum_block(struct block_header * header)96 int sum_block(struct block_header *header)
97 {
98 s32 *block = (s32 *)header;
99 u32 i;
100 s32 sum = 0;
101
102 for (i = 0; i < header->summed_longs; i++)
103 sum += *block++;
104
105 return (sum != 0);
106 }
107
108 /*
109 * Print an AmigaOS disk type. Disk types are a four-byte identifier
110 * describing the file system. They are usually written as a three-letter
111 * word followed by a backslash and a version number. For example,
112 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
113 * DOS\1 is FFS.
114 */
print_disk_type(u32 disk_type)115 static void print_disk_type(u32 disk_type)
116 {
117 char buffer[6];
118 buffer[0] = (disk_type & 0xFF000000)>>24;
119 buffer[1] = (disk_type & 0x00FF0000)>>16;
120 buffer[2] = (disk_type & 0x0000FF00)>>8;
121 buffer[3] = '\\';
122 buffer[4] = (disk_type & 0x000000FF) + '0';
123 buffer[5] = 0;
124 printf("%s", buffer);
125 }
126
127 /*
128 * Print the info contained within the given partition block
129 */
print_part_info(struct partition_block * p)130 static void print_part_info(struct partition_block *p)
131 {
132 struct amiga_part_geometry *g;
133
134 g = (struct amiga_part_geometry *)&(p->environment);
135
136 bstr_print(p->drive_name);
137 printf("%6d\t%6d\t",
138 g->low_cyl * g->block_per_track * g->surfaces ,
139 (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
140 print_disk_type(g->dos_type);
141 printf("\t%5d\n", g->boot_priority);
142 }
143
144 /*
145 * Search for the Rigid Disk Block. The rigid disk block is required
146 * to be within the first 16 blocks of a drive, needs to have
147 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
148 * sum-to-zero checksum
149 */
get_rdisk(block_dev_desc_t * dev_desc)150 struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
151 {
152 int i;
153 int limit;
154 char *s;
155
156 s = getenv("amiga_scanlimit");
157 if (s)
158 limit = simple_strtoul(s, NULL, 10);
159 else
160 limit = AMIGA_BLOCK_LIMIT;
161
162 for (i=0; i<limit; i++)
163 {
164 ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
165 (ulong *)block_buffer);
166 if (res == 1)
167 {
168 struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
169 if (trdb->id == AMIGA_ID_RDISK)
170 {
171 PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
172 if (sum_block((struct block_header *)block_buffer) == 0)
173 {
174 PRINTF("FOUND\n");
175 memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
176 return (struct rigid_disk_block *)&rdb;
177 }
178 }
179 }
180 }
181 PRINTF("Done scanning, no RDB found\n");
182 return NULL;
183 }
184
185 /*
186 * Search for boot code
187 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
188 * Ridgid disk block
189 */
190
get_bootcode(block_dev_desc_t * dev_desc)191 struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
192 {
193 int i;
194 int limit;
195 char *s;
196
197 s = getenv("amiga_scanlimit");
198 if (s)
199 limit = simple_strtoul(s, NULL, 10);
200 else
201 limit = AMIGA_BLOCK_LIMIT;
202
203 PRINTF("Scanning for BOOT from 0 to %d\n", limit);
204
205 for (i = 0; i < limit; i++)
206 {
207 ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
208 if (res == 1)
209 {
210 struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
211 if (boot->id == AMIGA_ID_BOOT)
212 {
213 PRINTF("BOOT block at %d, checking checksum\n", i);
214 if (sum_block((struct block_header *)block_buffer) == 0)
215 {
216 PRINTF("Found valid bootcode block\n");
217 memcpy(&bootcode, boot, sizeof(struct bootcode_block));
218 return &bootcode;
219 }
220 }
221 }
222 }
223
224 PRINTF("No boot code found on disk\n");
225 return 0;
226 }
227
228 /*
229 * Test if the given partition has an Amiga partition table/Rigid
230 * Disk block
231 */
test_part_amiga(block_dev_desc_t * dev_desc)232 int test_part_amiga(block_dev_desc_t *dev_desc)
233 {
234 struct rigid_disk_block *rdb;
235 struct bootcode_block *bootcode;
236
237 PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");
238
239 rdb = get_rdisk(dev_desc);
240 if (rdb)
241 {
242 bootcode = get_bootcode(dev_desc);
243 if (bootcode)
244 PRINTF("test_part_amiga: bootable Amiga disk\n");
245 else
246 PRINTF("test_part_amiga: non-bootable Amiga disk\n");
247
248 return 0;
249 }
250 else
251 {
252 PRINTF("test_part_amiga: no RDB found\n");
253 return -1;
254 }
255
256 }
257
258 /*
259 * Find partition number partnum on the given drive.
260 */
find_partition(block_dev_desc_t * dev_desc,int partnum)261 static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
262 {
263 struct rigid_disk_block *rdb;
264 struct partition_block *p;
265 u32 block;
266
267 PRINTF("Trying to find partition block %d\n", partnum);
268 rdb = get_rdisk(dev_desc);
269 if (!rdb)
270 {
271 PRINTF("find_partition: no rdb found\n");
272 return NULL;
273 }
274
275 PRINTF("find_partition: Scanning partition list\n");
276
277 block = rdb->partition_list;
278 PRINTF("find_partition: partition list at 0x%x\n", block);
279
280 while (block != 0xFFFFFFFF)
281 {
282 ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
283 (ulong *)block_buffer);
284 if (res == 1)
285 {
286 p = (struct partition_block *)block_buffer;
287 if (p->id == AMIGA_ID_PART)
288 {
289 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
290 if (sum_block((struct block_header *)p) == 0)
291 {
292 if (partnum == 0) break;
293 else
294 {
295 partnum--;
296 block = p->next;
297 }
298 }
299 } else block = 0xFFFFFFFF;
300 } else block = 0xFFFFFFFF;
301 }
302
303 if (block == 0xFFFFFFFF)
304 {
305 PRINTF("PART block not found\n");
306 return NULL;
307 }
308
309 return (struct partition_block *)block_buffer;
310 }
311
312 /*
313 * Get info about a partition
314 */
get_partition_info_amiga(block_dev_desc_t * dev_desc,int part,disk_partition_t * info)315 int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
316 {
317 struct partition_block *p = find_partition(dev_desc, part-1);
318 struct amiga_part_geometry *g;
319 u32 disk_type;
320
321 if (!p) return -1;
322
323 g = (struct amiga_part_geometry *)&(p->environment);
324 info->start = g->low_cyl * g->block_per_track * g->surfaces;
325 info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
326 info->blksz = rdb.block_bytes;
327 bcpl_strcpy(info->name, p->drive_name);
328
329
330 disk_type = g->dos_type;
331
332 info->type[0] = (disk_type & 0xFF000000)>>24;
333 info->type[1] = (disk_type & 0x00FF0000)>>16;
334 info->type[2] = (disk_type & 0x0000FF00)>>8;
335 info->type[3] = '\\';
336 info->type[4] = (disk_type & 0x000000FF) + '0';
337 info->type[5] = 0;
338
339 return 0;
340 }
341
print_part_amiga(block_dev_desc_t * dev_desc)342 void print_part_amiga (block_dev_desc_t *dev_desc)
343 {
344 struct rigid_disk_block *rdb;
345 struct bootcode_block *boot;
346 struct partition_block *p;
347 u32 block;
348 int i = 1;
349
350 rdb = get_rdisk(dev_desc);
351 if (!rdb)
352 {
353 PRINTF("print_part_amiga: no rdb found\n");
354 return;
355 }
356
357 PRINTF("print_part_amiga: Scanning partition list\n");
358
359 block = rdb->partition_list;
360 PRINTF("print_part_amiga: partition list at 0x%x\n", block);
361
362 printf("Summary: DiskBlockSize: %d\n"
363 " Cylinders : %d\n"
364 " Sectors/Track: %d\n"
365 " Heads : %d\n\n",
366 rdb->block_bytes, rdb->cylinders, rdb->sectors,
367 rdb->heads);
368
369 printf(" First Num. \n"
370 "Nr. Part. Name Block Block Type Boot Priority\n");
371
372 while (block != 0xFFFFFFFF)
373 {
374 ulong res;
375
376 PRINTF("Trying to load block #0x%X\n", block);
377
378 res = dev_desc->block_read(dev_desc->dev, block, 1,
379 (ulong *)block_buffer);
380 if (res == 1)
381 {
382 p = (struct partition_block *)block_buffer;
383 if (p->id == AMIGA_ID_PART)
384 {
385 PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
386 if (sum_block((struct block_header *)p) == 0)
387 {
388 printf("%-4d ", i); i++;
389 print_part_info(p);
390 block = p->next;
391 }
392 } else block = 0xFFFFFFFF;
393 } else block = 0xFFFFFFFF;
394 }
395
396 boot = get_bootcode(dev_desc);
397 if (boot)
398 {
399 printf("Disk is bootable\n");
400 }
401 }
402
403 #endif
404