Commit | Line | Data |
---|---|---|
8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (c) 1996-2000 Russell King. |
4 | * | |
1da177e4 LT |
5 | * Scan ADFS partitions on hard disk drives. Unfortunately, there |
6 | * isn't a standard for partitioning drives on Acorn machines, so | |
7 | * every single manufacturer of SCSI and IDE cards created their own | |
8 | * method. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/buffer_head.h> |
11 | #include <linux/adfs_fs.h> | |
12 | ||
13 | #include "check.h" | |
1da177e4 LT |
14 | |
15 | /* | |
16 | * Partition types. (Oh for reusability) | |
17 | */ | |
18 | #define PARTITION_RISCIX_MFM 1 | |
19 | #define PARTITION_RISCIX_SCSI 2 | |
20 | #define PARTITION_LINUX 9 | |
21 | ||
d05e96fe DG |
22 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
23 | defined(CONFIG_ACORN_PARTITION_ADFS) | |
1da177e4 LT |
24 | static struct adfs_discrecord * |
25 | adfs_partition(struct parsed_partitions *state, char *name, char *data, | |
26 | unsigned long first_sector, int slot) | |
27 | { | |
28 | struct adfs_discrecord *dr; | |
29 | unsigned int nr_sects; | |
30 | ||
31 | if (adfs_checkbblk(data)) | |
32 | return NULL; | |
33 | ||
34 | dr = (struct adfs_discrecord *)(data + 0x1c0); | |
35 | ||
36 | if (dr->disc_size == 0 && dr->disc_size_high == 0) | |
37 | return NULL; | |
38 | ||
39 | nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) | | |
40 | (le32_to_cpu(dr->disc_size) >> 9); | |
41 | ||
9c867fbe AD |
42 | if (name) { |
43 | strlcat(state->pp_buf, " [", PAGE_SIZE); | |
44 | strlcat(state->pp_buf, name, PAGE_SIZE); | |
45 | strlcat(state->pp_buf, "]", PAGE_SIZE); | |
46 | } | |
1da177e4 LT |
47 | put_partition(state, slot, first_sector, nr_sects); |
48 | return dr; | |
49 | } | |
d05e96fe | 50 | #endif |
1da177e4 LT |
51 | |
52 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
53 | ||
54 | struct riscix_part { | |
55 | __le32 start; | |
56 | __le32 length; | |
57 | __le32 one; | |
58 | char name[16]; | |
59 | }; | |
60 | ||
61 | struct riscix_record { | |
62 | __le32 magic; | |
63 | #define RISCIX_MAGIC cpu_to_le32(0x4a657320) | |
64 | __le32 date; | |
65 | struct riscix_part part[8]; | |
66 | }; | |
67 | ||
d05e96fe DG |
68 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
69 | defined(CONFIG_ACORN_PARTITION_ADFS) | |
1493bf21 TH |
70 | static int riscix_partition(struct parsed_partitions *state, |
71 | unsigned long first_sect, int slot, | |
72 | unsigned long nr_sects) | |
1da177e4 LT |
73 | { |
74 | Sector sect; | |
75 | struct riscix_record *rr; | |
76 | ||
1493bf21 | 77 | rr = read_part_sector(state, first_sect, §); |
1da177e4 LT |
78 | if (!rr) |
79 | return -1; | |
80 | ||
9c867fbe | 81 | strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE); |
1da177e4 LT |
82 | |
83 | ||
84 | if (rr->magic == RISCIX_MAGIC) { | |
85 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; | |
86 | int part; | |
87 | ||
9c867fbe | 88 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
1da177e4 LT |
89 | |
90 | put_partition(state, slot++, first_sect, size); | |
91 | for (part = 0; part < 8; part++) { | |
92 | if (rr->part[part].one && | |
93 | memcmp(rr->part[part].name, "All\0", 4)) { | |
94 | put_partition(state, slot++, | |
95 | le32_to_cpu(rr->part[part].start), | |
96 | le32_to_cpu(rr->part[part].length)); | |
9c867fbe AD |
97 | strlcat(state->pp_buf, "(", PAGE_SIZE); |
98 | strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE); | |
99 | strlcat(state->pp_buf, ")", PAGE_SIZE); | |
1da177e4 LT |
100 | } |
101 | } | |
102 | ||
9c867fbe | 103 | strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
1da177e4 LT |
104 | } else { |
105 | put_partition(state, slot++, first_sect, nr_sects); | |
106 | } | |
107 | ||
108 | put_dev_sector(sect); | |
109 | return slot; | |
110 | } | |
111 | #endif | |
d05e96fe | 112 | #endif |
1da177e4 LT |
113 | |
114 | #define LINUX_NATIVE_MAGIC 0xdeafa1de | |
115 | #define LINUX_SWAP_MAGIC 0xdeafab1e | |
116 | ||
117 | struct linux_part { | |
118 | __le32 magic; | |
119 | __le32 start_sect; | |
120 | __le32 nr_sects; | |
121 | }; | |
122 | ||
d05e96fe DG |
123 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
124 | defined(CONFIG_ACORN_PARTITION_ADFS) | |
1493bf21 TH |
125 | static int linux_partition(struct parsed_partitions *state, |
126 | unsigned long first_sect, int slot, | |
127 | unsigned long nr_sects) | |
1da177e4 LT |
128 | { |
129 | Sector sect; | |
130 | struct linux_part *linuxp; | |
131 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; | |
132 | ||
9c867fbe | 133 | strlcat(state->pp_buf, " [Linux]", PAGE_SIZE); |
1da177e4 LT |
134 | |
135 | put_partition(state, slot++, first_sect, size); | |
136 | ||
1493bf21 | 137 | linuxp = read_part_sector(state, first_sect, §); |
1da177e4 LT |
138 | if (!linuxp) |
139 | return -1; | |
140 | ||
9c867fbe | 141 | strlcat(state->pp_buf, " <", PAGE_SIZE); |
1da177e4 LT |
142 | while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) || |
143 | linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) { | |
144 | if (slot == state->limit) | |
145 | break; | |
146 | put_partition(state, slot++, first_sect + | |
147 | le32_to_cpu(linuxp->start_sect), | |
148 | le32_to_cpu(linuxp->nr_sects)); | |
149 | linuxp ++; | |
150 | } | |
9c867fbe | 151 | strlcat(state->pp_buf, " >", PAGE_SIZE); |
1da177e4 LT |
152 | |
153 | put_dev_sector(sect); | |
154 | return slot; | |
155 | } | |
d05e96fe | 156 | #endif |
1da177e4 LT |
157 | |
158 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
1493bf21 | 159 | int adfspart_check_CUMANA(struct parsed_partitions *state) |
1da177e4 LT |
160 | { |
161 | unsigned long first_sector = 0; | |
162 | unsigned int start_blk = 0; | |
163 | Sector sect; | |
164 | unsigned char *data; | |
165 | char *name = "CUMANA/ADFS"; | |
166 | int first = 1; | |
167 | int slot = 1; | |
168 | ||
169 | /* | |
170 | * Try Cumana style partitions - sector 6 contains ADFS boot block | |
171 | * with pointer to next 'drive'. | |
172 | * | |
173 | * There are unknowns in this code - is the 'cylinder number' of the | |
174 | * next partition relative to the start of this one - I'm assuming | |
175 | * it is. | |
176 | * | |
177 | * Also, which ID did Cumana use? | |
178 | * | |
179 | * This is totally unfinished, and will require more work to get it | |
180 | * going. Hence it is totally untested. | |
181 | */ | |
182 | do { | |
183 | struct adfs_discrecord *dr; | |
184 | unsigned int nr_sects; | |
185 | ||
1493bf21 | 186 | data = read_part_sector(state, start_blk * 2 + 6, §); |
1da177e4 LT |
187 | if (!data) |
188 | return -1; | |
189 | ||
190 | if (slot == state->limit) | |
191 | break; | |
192 | ||
193 | dr = adfs_partition(state, name, data, first_sector, slot++); | |
194 | if (!dr) | |
195 | break; | |
196 | ||
197 | name = NULL; | |
198 | ||
199 | nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) * | |
200 | (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) * | |
201 | dr->secspertrack; | |
202 | ||
203 | if (!nr_sects) | |
204 | break; | |
205 | ||
206 | first = 0; | |
207 | first_sector += nr_sects; | |
208 | start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9); | |
209 | nr_sects = 0; /* hmm - should be partition size */ | |
210 | ||
211 | switch (data[0x1fc] & 15) { | |
212 | case 0: /* No partition / ADFS? */ | |
213 | break; | |
214 | ||
215 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
216 | case PARTITION_RISCIX_SCSI: | |
217 | /* RISCiX - we don't know how to find the next one. */ | |
1493bf21 TH |
218 | slot = riscix_partition(state, first_sector, slot, |
219 | nr_sects); | |
1da177e4 LT |
220 | break; |
221 | #endif | |
222 | ||
223 | case PARTITION_LINUX: | |
1493bf21 TH |
224 | slot = linux_partition(state, first_sector, slot, |
225 | nr_sects); | |
1da177e4 LT |
226 | break; |
227 | } | |
228 | put_dev_sector(sect); | |
229 | if (slot == -1) | |
230 | return -1; | |
231 | } while (1); | |
232 | put_dev_sector(sect); | |
233 | return first ? 0 : 1; | |
234 | } | |
235 | #endif | |
236 | ||
237 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
238 | /* | |
239 | * Purpose: allocate ADFS partitions. | |
240 | * | |
241 | * Params : hd - pointer to gendisk structure to store partition info. | |
242 | * dev - device number to access. | |
243 | * | |
244 | * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok. | |
245 | * | |
246 | * Alloc : hda = whole drive | |
247 | * hda1 = ADFS partition on first drive. | |
248 | * hda2 = non-ADFS partition. | |
249 | */ | |
1493bf21 | 250 | int adfspart_check_ADFS(struct parsed_partitions *state) |
1da177e4 LT |
251 | { |
252 | unsigned long start_sect, nr_sects, sectscyl, heads; | |
253 | Sector sect; | |
254 | unsigned char *data; | |
255 | struct adfs_discrecord *dr; | |
256 | unsigned char id; | |
257 | int slot = 1; | |
258 | ||
1493bf21 | 259 | data = read_part_sector(state, 6, §); |
1da177e4 LT |
260 | if (!data) |
261 | return -1; | |
262 | ||
263 | dr = adfs_partition(state, "ADFS", data, 0, slot++); | |
264 | if (!dr) { | |
265 | put_dev_sector(sect); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | heads = dr->heads + ((dr->lowsector >> 6) & 1); | |
270 | sectscyl = dr->secspertrack * heads; | |
271 | start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl; | |
272 | id = data[0x1fc] & 15; | |
273 | put_dev_sector(sect); | |
274 | ||
1da177e4 LT |
275 | /* |
276 | * Work out start of non-adfs partition. | |
277 | */ | |
1493bf21 | 278 | nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect; |
1da177e4 LT |
279 | |
280 | if (start_sect) { | |
281 | switch (id) { | |
282 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
283 | case PARTITION_RISCIX_SCSI: | |
284 | case PARTITION_RISCIX_MFM: | |
1493bf21 TH |
285 | slot = riscix_partition(state, start_sect, slot, |
286 | nr_sects); | |
1da177e4 LT |
287 | break; |
288 | #endif | |
289 | ||
290 | case PARTITION_LINUX: | |
1493bf21 TH |
291 | slot = linux_partition(state, start_sect, slot, |
292 | nr_sects); | |
1da177e4 LT |
293 | break; |
294 | } | |
295 | } | |
9c867fbe | 296 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
297 | return 1; |
298 | } | |
299 | #endif | |
300 | ||
301 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
302 | ||
303 | struct ics_part { | |
304 | __le32 start; | |
305 | __le32 size; | |
306 | }; | |
307 | ||
1493bf21 TH |
308 | static int adfspart_check_ICSLinux(struct parsed_partitions *state, |
309 | unsigned long block) | |
1da177e4 LT |
310 | { |
311 | Sector sect; | |
1493bf21 | 312 | unsigned char *data = read_part_sector(state, block, §); |
1da177e4 LT |
313 | int result = 0; |
314 | ||
315 | if (data) { | |
316 | if (memcmp(data, "LinuxPart", 9) == 0) | |
317 | result = 1; | |
318 | put_dev_sector(sect); | |
319 | } | |
320 | ||
321 | return result; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Check for a valid ICS partition using the checksum. | |
326 | */ | |
327 | static inline int valid_ics_sector(const unsigned char *data) | |
328 | { | |
329 | unsigned long sum; | |
330 | int i; | |
331 | ||
332 | for (i = 0, sum = 0x50617274; i < 508; i++) | |
333 | sum += data[i]; | |
334 | ||
335 | sum -= le32_to_cpu(*(__le32 *)(&data[508])); | |
336 | ||
337 | return sum == 0; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Purpose: allocate ICS partitions. | |
342 | * Params : hd - pointer to gendisk structure to store partition info. | |
343 | * dev - device number to access. | |
344 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. | |
345 | * Alloc : hda = whole drive | |
346 | * hda1 = ADFS partition 0 on first drive. | |
347 | * hda2 = ADFS partition 1 on first drive. | |
348 | * ..etc.. | |
349 | */ | |
1493bf21 | 350 | int adfspart_check_ICS(struct parsed_partitions *state) |
1da177e4 LT |
351 | { |
352 | const unsigned char *data; | |
353 | const struct ics_part *p; | |
354 | int slot; | |
355 | Sector sect; | |
356 | ||
357 | /* | |
358 | * Try ICS style partitions - sector 0 contains partition info. | |
359 | */ | |
1493bf21 | 360 | data = read_part_sector(state, 0, §); |
1da177e4 LT |
361 | if (!data) |
362 | return -1; | |
363 | ||
364 | if (!valid_ics_sector(data)) { | |
365 | put_dev_sector(sect); | |
366 | return 0; | |
367 | } | |
368 | ||
9c867fbe | 369 | strlcat(state->pp_buf, " [ICS]", PAGE_SIZE); |
1da177e4 LT |
370 | |
371 | for (slot = 1, p = (const struct ics_part *)data; p->size; p++) { | |
372 | u32 start = le32_to_cpu(p->start); | |
373 | s32 size = le32_to_cpu(p->size); /* yes, it's signed. */ | |
374 | ||
375 | if (slot == state->limit) | |
376 | break; | |
377 | ||
378 | /* | |
379 | * Negative sizes tell the RISC OS ICS driver to ignore | |
380 | * this partition - in effect it says that this does not | |
381 | * contain an ADFS filesystem. | |
382 | */ | |
383 | if (size < 0) { | |
384 | size = -size; | |
385 | ||
386 | /* | |
387 | * Our own extension - We use the first sector | |
388 | * of the partition to identify what type this | |
389 | * partition is. We must not make this visible | |
390 | * to the filesystem. | |
391 | */ | |
1493bf21 | 392 | if (size > 1 && adfspart_check_ICSLinux(state, start)) { |
1da177e4 LT |
393 | start += 1; |
394 | size -= 1; | |
395 | } | |
396 | } | |
397 | ||
398 | if (size) | |
399 | put_partition(state, slot++, start, size); | |
400 | } | |
401 | ||
402 | put_dev_sector(sect); | |
9c867fbe | 403 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
404 | return 1; |
405 | } | |
406 | #endif | |
407 | ||
408 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
409 | struct ptec_part { | |
410 | __le32 unused1; | |
411 | __le32 unused2; | |
412 | __le32 start; | |
413 | __le32 size; | |
414 | __le32 unused5; | |
415 | char type[8]; | |
416 | }; | |
417 | ||
418 | static inline int valid_ptec_sector(const unsigned char *data) | |
419 | { | |
420 | unsigned char checksum = 0x2a; | |
421 | int i; | |
422 | ||
423 | /* | |
424 | * If it looks like a PC/BIOS partition, then it | |
425 | * probably isn't PowerTec. | |
426 | */ | |
427 | if (data[510] == 0x55 && data[511] == 0xaa) | |
428 | return 0; | |
429 | ||
430 | for (i = 0; i < 511; i++) | |
431 | checksum += data[i]; | |
432 | ||
433 | return checksum == data[511]; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Purpose: allocate ICS partitions. | |
438 | * Params : hd - pointer to gendisk structure to store partition info. | |
439 | * dev - device number to access. | |
440 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. | |
441 | * Alloc : hda = whole drive | |
442 | * hda1 = ADFS partition 0 on first drive. | |
443 | * hda2 = ADFS partition 1 on first drive. | |
444 | * ..etc.. | |
445 | */ | |
1493bf21 | 446 | int adfspart_check_POWERTEC(struct parsed_partitions *state) |
1da177e4 LT |
447 | { |
448 | Sector sect; | |
449 | const unsigned char *data; | |
450 | const struct ptec_part *p; | |
451 | int slot = 1; | |
452 | int i; | |
453 | ||
1493bf21 | 454 | data = read_part_sector(state, 0, §); |
1da177e4 LT |
455 | if (!data) |
456 | return -1; | |
457 | ||
458 | if (!valid_ptec_sector(data)) { | |
459 | put_dev_sector(sect); | |
460 | return 0; | |
461 | } | |
462 | ||
9c867fbe | 463 | strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE); |
1da177e4 LT |
464 | |
465 | for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) { | |
466 | u32 start = le32_to_cpu(p->start); | |
467 | u32 size = le32_to_cpu(p->size); | |
468 | ||
469 | if (size) | |
470 | put_partition(state, slot++, start, size); | |
471 | } | |
472 | ||
473 | put_dev_sector(sect); | |
9c867fbe | 474 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
475 | return 1; |
476 | } | |
477 | #endif | |
478 | ||
479 | #ifdef CONFIG_ACORN_PARTITION_EESOX | |
480 | struct eesox_part { | |
481 | char magic[6]; | |
482 | char name[10]; | |
483 | __le32 start; | |
484 | __le32 unused6; | |
485 | __le32 unused7; | |
486 | __le32 unused8; | |
487 | }; | |
488 | ||
489 | /* | |
490 | * Guess who created this format? | |
491 | */ | |
492 | static const char eesox_name[] = { | |
493 | 'N', 'e', 'i', 'l', ' ', | |
494 | 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' ' | |
495 | }; | |
496 | ||
497 | /* | |
498 | * EESOX SCSI partition format. | |
499 | * | |
500 | * This is a goddamned awful partition format. We don't seem to store | |
501 | * the size of the partition in this table, only the start addresses. | |
502 | * | |
503 | * There are two possibilities where the size comes from: | |
504 | * 1. The individual ADFS boot block entries that are placed on the disk. | |
505 | * 2. The start address of the next entry. | |
506 | */ | |
1493bf21 | 507 | int adfspart_check_EESOX(struct parsed_partitions *state) |
1da177e4 LT |
508 | { |
509 | Sector sect; | |
510 | const unsigned char *data; | |
511 | unsigned char buffer[256]; | |
512 | struct eesox_part *p; | |
513 | sector_t start = 0; | |
514 | int i, slot = 1; | |
515 | ||
1493bf21 | 516 | data = read_part_sector(state, 7, §); |
1da177e4 LT |
517 | if (!data) |
518 | return -1; | |
519 | ||
520 | /* | |
521 | * "Decrypt" the partition table. God knows why... | |
522 | */ | |
523 | for (i = 0; i < 256; i++) | |
524 | buffer[i] = data[i] ^ eesox_name[i & 15]; | |
525 | ||
526 | put_dev_sector(sect); | |
527 | ||
528 | for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) { | |
529 | sector_t next; | |
530 | ||
531 | if (memcmp(p->magic, "Eesox", 6)) | |
532 | break; | |
533 | ||
534 | next = le32_to_cpu(p->start); | |
535 | if (i) | |
536 | put_partition(state, slot++, start, next - start); | |
537 | start = next; | |
538 | } | |
539 | ||
540 | if (i != 0) { | |
541 | sector_t size; | |
542 | ||
1493bf21 | 543 | size = get_capacity(state->bdev->bd_disk); |
1da177e4 | 544 | put_partition(state, slot++, start, size - start); |
9c867fbe | 545 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
546 | } |
547 | ||
548 | return i ? 1 : 0; | |
549 | } | |
550 | #endif |