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1 | /* |
2 | * linux/fs/partitions/acorn.c |
3 | * |
4 | * Copyright (c) 1996-2000 Russell King. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License version 2 as |
8 | * published by the Free Software Foundation. |
9 | * |
10 | * Scan ADFS partitions on hard disk drives. Unfortunately, there |
11 | * isn't a standard for partitioning drives on Acorn machines, so |
12 | * every single manufacturer of SCSI and IDE cards created their own |
13 | * method. |
14 | */ |
15 | #include <linux/buffer_head.h> |
16 | #include <linux/adfs_fs.h> |
17 | |
18 | #include "check.h" |
19 | #include "acorn.h" |
20 | |
21 | /* |
22 | * Partition types. (Oh for reusability) |
23 | */ |
24 | #define PARTITION_RISCIX_MFM 1 |
25 | #define PARTITION_RISCIX_SCSI 2 |
26 | #define PARTITION_LINUX 9 |
27 | |
28 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
29 | defined(CONFIG_ACORN_PARTITION_ADFS) |
30 | static struct adfs_discrecord * |
31 | adfs_partition(struct parsed_partitions *state, char *name, char *data, |
32 | unsigned long first_sector, int slot) |
33 | { |
34 | struct adfs_discrecord *dr; |
35 | unsigned int nr_sects; |
36 | |
37 | if (adfs_checkbblk(data)) |
38 | return NULL; |
39 | |
40 | dr = (struct adfs_discrecord *)(data + 0x1c0); |
41 | |
42 | if (dr->disc_size == 0 && dr->disc_size_high == 0) |
43 | return NULL; |
44 | |
45 | nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) | |
46 | (le32_to_cpu(dr->disc_size) >> 9); |
47 | |
48 | if (name) { |
49 | strlcat(state->pp_buf, " [", PAGE_SIZE); |
50 | strlcat(state->pp_buf, name, PAGE_SIZE); |
51 | strlcat(state->pp_buf, "]", PAGE_SIZE); |
52 | } |
53 | put_partition(state, slot, first_sector, nr_sects); |
54 | return dr; |
55 | } |
56 | #endif |
57 | |
58 | #ifdef CONFIG_ACORN_PARTITION_RISCIX |
59 | |
60 | struct riscix_part { |
61 | __le32 start; |
62 | __le32 length; |
63 | __le32 one; |
64 | char name[16]; |
65 | }; |
66 | |
67 | struct riscix_record { |
68 | __le32 magic; |
69 | #define RISCIX_MAGIC cpu_to_le32(0x4a657320) |
70 | __le32 date; |
71 | struct riscix_part part[8]; |
72 | }; |
73 | |
74 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
75 | defined(CONFIG_ACORN_PARTITION_ADFS) |
76 | static int riscix_partition(struct parsed_partitions *state, |
77 | unsigned long first_sect, int slot, |
78 | unsigned long nr_sects) |
79 | { |
80 | Sector sect; |
81 | struct riscix_record *rr; |
82 | |
83 | rr = read_part_sector(state, first_sect, §); |
84 | if (!rr) |
85 | return -1; |
86 | |
87 | strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE); |
88 | |
89 | |
90 | if (rr->magic == RISCIX_MAGIC) { |
91 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; |
92 | int part; |
93 | |
94 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
95 | |
96 | put_partition(state, slot++, first_sect, size); |
97 | for (part = 0; part < 8; part++) { |
98 | if (rr->part[part].one && |
99 | memcmp(rr->part[part].name, "All\0", 4)) { |
100 | put_partition(state, slot++, |
101 | le32_to_cpu(rr->part[part].start), |
102 | le32_to_cpu(rr->part[part].length)); |
103 | strlcat(state->pp_buf, "(", PAGE_SIZE); |
104 | strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE); |
105 | strlcat(state->pp_buf, ")", PAGE_SIZE); |
106 | } |
107 | } |
108 | |
109 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
110 | } else { |
111 | put_partition(state, slot++, first_sect, nr_sects); |
112 | } |
113 | |
114 | put_dev_sector(sect); |
115 | return slot; |
116 | } |
117 | #endif |
118 | #endif |
119 | |
120 | #define LINUX_NATIVE_MAGIC 0xdeafa1de |
121 | #define LINUX_SWAP_MAGIC 0xdeafab1e |
122 | |
123 | struct linux_part { |
124 | __le32 magic; |
125 | __le32 start_sect; |
126 | __le32 nr_sects; |
127 | }; |
128 | |
129 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
130 | defined(CONFIG_ACORN_PARTITION_ADFS) |
131 | static int linux_partition(struct parsed_partitions *state, |
132 | unsigned long first_sect, int slot, |
133 | unsigned long nr_sects) |
134 | { |
135 | Sector sect; |
136 | struct linux_part *linuxp; |
137 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; |
138 | |
139 | strlcat(state->pp_buf, " [Linux]", PAGE_SIZE); |
140 | |
141 | put_partition(state, slot++, first_sect, size); |
142 | |
143 | linuxp = read_part_sector(state, first_sect, §); |
144 | if (!linuxp) |
145 | return -1; |
146 | |
147 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
148 | while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) || |
149 | linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) { |
150 | if (slot == state->limit) |
151 | break; |
152 | put_partition(state, slot++, first_sect + |
153 | le32_to_cpu(linuxp->start_sect), |
154 | le32_to_cpu(linuxp->nr_sects)); |
155 | linuxp ++; |
156 | } |
157 | strlcat(state->pp_buf, " >", PAGE_SIZE); |
158 | |
159 | put_dev_sector(sect); |
160 | return slot; |
161 | } |
162 | #endif |
163 | |
164 | #ifdef CONFIG_ACORN_PARTITION_CUMANA |
165 | int adfspart_check_CUMANA(struct parsed_partitions *state) |
166 | { |
167 | unsigned long first_sector = 0; |
168 | unsigned int start_blk = 0; |
169 | Sector sect; |
170 | unsigned char *data; |
171 | char *name = "CUMANA/ADFS"; |
172 | int first = 1; |
173 | int slot = 1; |
174 | |
175 | /* |
176 | * Try Cumana style partitions - sector 6 contains ADFS boot block |
177 | * with pointer to next 'drive'. |
178 | * |
179 | * There are unknowns in this code - is the 'cylinder number' of the |
180 | * next partition relative to the start of this one - I'm assuming |
181 | * it is. |
182 | * |
183 | * Also, which ID did Cumana use? |
184 | * |
185 | * This is totally unfinished, and will require more work to get it |
186 | * going. Hence it is totally untested. |
187 | */ |
188 | do { |
189 | struct adfs_discrecord *dr; |
190 | unsigned int nr_sects; |
191 | |
192 | data = read_part_sector(state, start_blk * 2 + 6, §); |
193 | if (!data) |
194 | return -1; |
195 | |
196 | if (slot == state->limit) |
197 | break; |
198 | |
199 | dr = adfs_partition(state, name, data, first_sector, slot++); |
200 | if (!dr) |
201 | break; |
202 | |
203 | name = NULL; |
204 | |
205 | nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) * |
206 | (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) * |
207 | dr->secspertrack; |
208 | |
209 | if (!nr_sects) |
210 | break; |
211 | |
212 | first = 0; |
213 | first_sector += nr_sects; |
214 | start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9); |
215 | nr_sects = 0; /* hmm - should be partition size */ |
216 | |
217 | switch (data[0x1fc] & 15) { |
218 | case 0: /* No partition / ADFS? */ |
219 | break; |
220 | |
221 | #ifdef CONFIG_ACORN_PARTITION_RISCIX |
222 | case PARTITION_RISCIX_SCSI: |
223 | /* RISCiX - we don't know how to find the next one. */ |
224 | slot = riscix_partition(state, first_sector, slot, |
225 | nr_sects); |
226 | break; |
227 | #endif |
228 | |
229 | case PARTITION_LINUX: |
230 | slot = linux_partition(state, first_sector, slot, |
231 | nr_sects); |
232 | break; |
233 | } |
234 | put_dev_sector(sect); |
235 | if (slot == -1) |
236 | return -1; |
237 | } while (1); |
238 | put_dev_sector(sect); |
239 | return first ? 0 : 1; |
240 | } |
241 | #endif |
242 | |
243 | #ifdef CONFIG_ACORN_PARTITION_ADFS |
244 | /* |
245 | * Purpose: allocate ADFS partitions. |
246 | * |
247 | * Params : hd - pointer to gendisk structure to store partition info. |
248 | * dev - device number to access. |
249 | * |
250 | * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok. |
251 | * |
252 | * Alloc : hda = whole drive |
253 | * hda1 = ADFS partition on first drive. |
254 | * hda2 = non-ADFS partition. |
255 | */ |
256 | int adfspart_check_ADFS(struct parsed_partitions *state) |
257 | { |
258 | unsigned long start_sect, nr_sects, sectscyl, heads; |
259 | Sector sect; |
260 | unsigned char *data; |
261 | struct adfs_discrecord *dr; |
262 | unsigned char id; |
263 | int slot = 1; |
264 | |
265 | data = read_part_sector(state, 6, §); |
266 | if (!data) |
267 | return -1; |
268 | |
269 | dr = adfs_partition(state, "ADFS", data, 0, slot++); |
270 | if (!dr) { |
271 | put_dev_sector(sect); |
272 | return 0; |
273 | } |
274 | |
275 | heads = dr->heads + ((dr->lowsector >> 6) & 1); |
276 | sectscyl = dr->secspertrack * heads; |
277 | start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl; |
278 | id = data[0x1fc] & 15; |
279 | put_dev_sector(sect); |
280 | |
281 | /* |
282 | * Work out start of non-adfs partition. |
283 | */ |
284 | nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect; |
285 | |
286 | if (start_sect) { |
287 | switch (id) { |
288 | #ifdef CONFIG_ACORN_PARTITION_RISCIX |
289 | case PARTITION_RISCIX_SCSI: |
290 | case PARTITION_RISCIX_MFM: |
291 | slot = riscix_partition(state, start_sect, slot, |
292 | nr_sects); |
293 | break; |
294 | #endif |
295 | |
296 | case PARTITION_LINUX: |
297 | slot = linux_partition(state, start_sect, slot, |
298 | nr_sects); |
299 | break; |
300 | } |
301 | } |
302 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
303 | return 1; |
304 | } |
305 | #endif |
306 | |
307 | #ifdef CONFIG_ACORN_PARTITION_ICS |
308 | |
309 | struct ics_part { |
310 | __le32 start; |
311 | __le32 size; |
312 | }; |
313 | |
314 | static int adfspart_check_ICSLinux(struct parsed_partitions *state, |
315 | unsigned long block) |
316 | { |
317 | Sector sect; |
318 | unsigned char *data = read_part_sector(state, block, §); |
319 | int result = 0; |
320 | |
321 | if (data) { |
322 | if (memcmp(data, "LinuxPart", 9) == 0) |
323 | result = 1; |
324 | put_dev_sector(sect); |
325 | } |
326 | |
327 | return result; |
328 | } |
329 | |
330 | /* |
331 | * Check for a valid ICS partition using the checksum. |
332 | */ |
333 | static inline int valid_ics_sector(const unsigned char *data) |
334 | { |
335 | unsigned long sum; |
336 | int i; |
337 | |
338 | for (i = 0, sum = 0x50617274; i < 508; i++) |
339 | sum += data[i]; |
340 | |
341 | sum -= le32_to_cpu(*(__le32 *)(&data[508])); |
342 | |
343 | return sum == 0; |
344 | } |
345 | |
346 | /* |
347 | * Purpose: allocate ICS partitions. |
348 | * Params : hd - pointer to gendisk structure to store partition info. |
349 | * dev - device number to access. |
350 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. |
351 | * Alloc : hda = whole drive |
352 | * hda1 = ADFS partition 0 on first drive. |
353 | * hda2 = ADFS partition 1 on first drive. |
354 | * ..etc.. |
355 | */ |
356 | int adfspart_check_ICS(struct parsed_partitions *state) |
357 | { |
358 | const unsigned char *data; |
359 | const struct ics_part *p; |
360 | int slot; |
361 | Sector sect; |
362 | |
363 | /* |
364 | * Try ICS style partitions - sector 0 contains partition info. |
365 | */ |
366 | data = read_part_sector(state, 0, §); |
367 | if (!data) |
368 | return -1; |
369 | |
370 | if (!valid_ics_sector(data)) { |
371 | put_dev_sector(sect); |
372 | return 0; |
373 | } |
374 | |
375 | strlcat(state->pp_buf, " [ICS]", PAGE_SIZE); |
376 | |
377 | for (slot = 1, p = (const struct ics_part *)data; p->size; p++) { |
378 | u32 start = le32_to_cpu(p->start); |
379 | s32 size = le32_to_cpu(p->size); /* yes, it's signed. */ |
380 | |
381 | if (slot == state->limit) |
382 | break; |
383 | |
384 | /* |
385 | * Negative sizes tell the RISC OS ICS driver to ignore |
386 | * this partition - in effect it says that this does not |
387 | * contain an ADFS filesystem. |
388 | */ |
389 | if (size < 0) { |
390 | size = -size; |
391 | |
392 | /* |
393 | * Our own extension - We use the first sector |
394 | * of the partition to identify what type this |
395 | * partition is. We must not make this visible |
396 | * to the filesystem. |
397 | */ |
398 | if (size > 1 && adfspart_check_ICSLinux(state, start)) { |
399 | start += 1; |
400 | size -= 1; |
401 | } |
402 | } |
403 | |
404 | if (size) |
405 | put_partition(state, slot++, start, size); |
406 | } |
407 | |
408 | put_dev_sector(sect); |
409 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
410 | return 1; |
411 | } |
412 | #endif |
413 | |
414 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC |
415 | struct ptec_part { |
416 | __le32 unused1; |
417 | __le32 unused2; |
418 | __le32 start; |
419 | __le32 size; |
420 | __le32 unused5; |
421 | char type[8]; |
422 | }; |
423 | |
424 | static inline int valid_ptec_sector(const unsigned char *data) |
425 | { |
426 | unsigned char checksum = 0x2a; |
427 | int i; |
428 | |
429 | /* |
430 | * If it looks like a PC/BIOS partition, then it |
431 | * probably isn't PowerTec. |
432 | */ |
433 | if (data[510] == 0x55 && data[511] == 0xaa) |
434 | return 0; |
435 | |
436 | for (i = 0; i < 511; i++) |
437 | checksum += data[i]; |
438 | |
439 | return checksum == data[511]; |
440 | } |
441 | |
442 | /* |
443 | * Purpose: allocate ICS partitions. |
444 | * Params : hd - pointer to gendisk structure to store partition info. |
445 | * dev - device number to access. |
446 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. |
447 | * Alloc : hda = whole drive |
448 | * hda1 = ADFS partition 0 on first drive. |
449 | * hda2 = ADFS partition 1 on first drive. |
450 | * ..etc.. |
451 | */ |
452 | int adfspart_check_POWERTEC(struct parsed_partitions *state) |
453 | { |
454 | Sector sect; |
455 | const unsigned char *data; |
456 | const struct ptec_part *p; |
457 | int slot = 1; |
458 | int i; |
459 | |
460 | data = read_part_sector(state, 0, §); |
461 | if (!data) |
462 | return -1; |
463 | |
464 | if (!valid_ptec_sector(data)) { |
465 | put_dev_sector(sect); |
466 | return 0; |
467 | } |
468 | |
469 | strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE); |
470 | |
471 | for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) { |
472 | u32 start = le32_to_cpu(p->start); |
473 | u32 size = le32_to_cpu(p->size); |
474 | |
475 | if (size) |
476 | put_partition(state, slot++, start, size); |
477 | } |
478 | |
479 | put_dev_sector(sect); |
480 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
481 | return 1; |
482 | } |
483 | #endif |
484 | |
485 | #ifdef CONFIG_ACORN_PARTITION_EESOX |
486 | struct eesox_part { |
487 | char magic[6]; |
488 | char name[10]; |
489 | __le32 start; |
490 | __le32 unused6; |
491 | __le32 unused7; |
492 | __le32 unused8; |
493 | }; |
494 | |
495 | /* |
496 | * Guess who created this format? |
497 | */ |
498 | static const char eesox_name[] = { |
499 | 'N', 'e', 'i', 'l', ' ', |
500 | 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' ' |
501 | }; |
502 | |
503 | /* |
504 | * EESOX SCSI partition format. |
505 | * |
506 | * This is a goddamned awful partition format. We don't seem to store |
507 | * the size of the partition in this table, only the start addresses. |
508 | * |
509 | * There are two possibilities where the size comes from: |
510 | * 1. The individual ADFS boot block entries that are placed on the disk. |
511 | * 2. The start address of the next entry. |
512 | */ |
513 | int adfspart_check_EESOX(struct parsed_partitions *state) |
514 | { |
515 | Sector sect; |
516 | const unsigned char *data; |
517 | unsigned char buffer[256]; |
518 | struct eesox_part *p; |
519 | sector_t start = 0; |
520 | int i, slot = 1; |
521 | |
522 | data = read_part_sector(state, 7, §); |
523 | if (!data) |
524 | return -1; |
525 | |
526 | /* |
527 | * "Decrypt" the partition table. God knows why... |
528 | */ |
529 | for (i = 0; i < 256; i++) |
530 | buffer[i] = data[i] ^ eesox_name[i & 15]; |
531 | |
532 | put_dev_sector(sect); |
533 | |
534 | for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) { |
535 | sector_t next; |
536 | |
537 | if (memcmp(p->magic, "Eesox", 6)) |
538 | break; |
539 | |
540 | next = le32_to_cpu(p->start); |
541 | if (i) |
542 | put_partition(state, slot++, start, next - start); |
543 | start = next; |
544 | } |
545 | |
546 | if (i != 0) { |
547 | sector_t size; |
548 | |
549 | size = get_capacity(state->bdev->bd_disk); |
550 | put_partition(state, slot++, start, size - start); |
551 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
552 | } |
553 | |
554 | return i ? 1 : 0; |
555 | } |
556 | #endif |
557 |
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