1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (c) 1996-2000 Russell King. |
4 | * |
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 | */ |
10 | #include <linux/buffer_head.h> |
11 | #include <linux/adfs_fs.h> |
12 | |
13 | #include "check.h" |
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 | |
22 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
23 | defined(CONFIG_ACORN_PARTITION_ADFS) |
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(ptr: 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 | |
42 | if (name) { |
43 | strlcat(p: state->pp_buf, q: " [" , PAGE_SIZE); |
44 | strlcat(p: state->pp_buf, q: name, PAGE_SIZE); |
45 | strlcat(p: state->pp_buf, q: "]" , PAGE_SIZE); |
46 | } |
47 | put_partition(p: state, n: slot, from: first_sector, size: nr_sects); |
48 | return dr; |
49 | } |
50 | #endif |
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 | |
68 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
69 | defined(CONFIG_ACORN_PARTITION_ADFS) |
70 | static int riscix_partition(struct parsed_partitions *state, |
71 | unsigned long first_sect, int slot, |
72 | unsigned long nr_sects) |
73 | { |
74 | Sector sect; |
75 | struct riscix_record *rr; |
76 | |
77 | rr = read_part_sector(state, n: first_sect, p: §); |
78 | if (!rr) |
79 | return -1; |
80 | |
81 | strlcat(p: state->pp_buf, q: " [RISCiX]" , PAGE_SIZE); |
82 | |
83 | |
84 | if (rr->magic == RISCIX_MAGIC) { |
85 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; |
86 | int part; |
87 | |
88 | strlcat(p: state->pp_buf, q: " <" , PAGE_SIZE); |
89 | |
90 | put_partition(p: state, n: slot++, from: first_sect, size); |
91 | for (part = 0; part < 8; part++) { |
92 | if (rr->part[part].one && |
93 | memcmp(p: rr->part[part].name, q: "All\0" , size: 4)) { |
94 | put_partition(p: state, n: slot++, |
95 | le32_to_cpu(rr->part[part].start), |
96 | le32_to_cpu(rr->part[part].length)); |
97 | strlcat(p: state->pp_buf, q: "(" , PAGE_SIZE); |
98 | strlcat(p: state->pp_buf, q: rr->part[part].name, PAGE_SIZE); |
99 | strlcat(p: state->pp_buf, q: ")" , PAGE_SIZE); |
100 | } |
101 | } |
102 | |
103 | strlcat(p: state->pp_buf, q: " >\n" , PAGE_SIZE); |
104 | } else { |
105 | put_partition(p: state, n: slot++, from: first_sect, size: nr_sects); |
106 | } |
107 | |
108 | put_dev_sector(p: sect); |
109 | return slot; |
110 | } |
111 | #endif |
112 | #endif |
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 | |
123 | #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \ |
124 | defined(CONFIG_ACORN_PARTITION_ADFS) |
125 | static int linux_partition(struct parsed_partitions *state, |
126 | unsigned long first_sect, int slot, |
127 | unsigned long nr_sects) |
128 | { |
129 | Sector sect; |
130 | struct linux_part *linuxp; |
131 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; |
132 | |
133 | strlcat(p: state->pp_buf, q: " [Linux]" , PAGE_SIZE); |
134 | |
135 | put_partition(p: state, n: slot++, from: first_sect, size); |
136 | |
137 | linuxp = read_part_sector(state, n: first_sect, p: §); |
138 | if (!linuxp) |
139 | return -1; |
140 | |
141 | strlcat(p: state->pp_buf, q: " <" , PAGE_SIZE); |
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(p: state, n: slot++, from: first_sect + |
147 | le32_to_cpu(linuxp->start_sect), |
148 | le32_to_cpu(linuxp->nr_sects)); |
149 | linuxp ++; |
150 | } |
151 | strlcat(p: state->pp_buf, q: " >" , PAGE_SIZE); |
152 | |
153 | put_dev_sector(p: sect); |
154 | return slot; |
155 | } |
156 | #endif |
157 | |
158 | #ifdef CONFIG_ACORN_PARTITION_CUMANA |
159 | int adfspart_check_CUMANA(struct parsed_partitions *state) |
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 | |
186 | data = read_part_sector(state, n: start_blk * 2 + 6, p: §); |
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: 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. */ |
218 | slot = riscix_partition(state, first_sect: first_sector, slot, |
219 | nr_sects); |
220 | break; |
221 | #endif |
222 | |
223 | case PARTITION_LINUX: |
224 | slot = linux_partition(state, first_sect: first_sector, slot, |
225 | nr_sects); |
226 | break; |
227 | } |
228 | put_dev_sector(p: sect); |
229 | if (slot == -1) |
230 | return -1; |
231 | } while (1); |
232 | put_dev_sector(p: 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 | */ |
250 | int adfspart_check_ADFS(struct parsed_partitions *state) |
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 | |
259 | data = read_part_sector(state, n: 6, p: §); |
260 | if (!data) |
261 | return -1; |
262 | |
263 | dr = adfs_partition(state, name: "ADFS" , data, first_sector: 0, slot: slot++); |
264 | if (!dr) { |
265 | put_dev_sector(p: 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(p: sect); |
274 | |
275 | /* |
276 | * Work out start of non-adfs partition. |
277 | */ |
278 | nr_sects = get_capacity(disk: state->disk) - start_sect; |
279 | |
280 | if (start_sect) { |
281 | switch (id) { |
282 | #ifdef CONFIG_ACORN_PARTITION_RISCIX |
283 | case PARTITION_RISCIX_SCSI: |
284 | case PARTITION_RISCIX_MFM: |
285 | riscix_partition(state, first_sect: start_sect, slot, |
286 | nr_sects); |
287 | break; |
288 | #endif |
289 | |
290 | case PARTITION_LINUX: |
291 | linux_partition(state, first_sect: start_sect, slot, |
292 | nr_sects); |
293 | break; |
294 | } |
295 | } |
296 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
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 | |
308 | static int adfspart_check_ICSLinux(struct parsed_partitions *state, |
309 | unsigned long block) |
310 | { |
311 | Sector sect; |
312 | unsigned char *data = read_part_sector(state, n: block, p: §); |
313 | int result = 0; |
314 | |
315 | if (data) { |
316 | if (memcmp(p: data, q: "LinuxPart" , size: 9) == 0) |
317 | result = 1; |
318 | put_dev_sector(p: 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 | */ |
350 | int adfspart_check_ICS(struct parsed_partitions *state) |
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 | */ |
360 | data = read_part_sector(state, n: 0, p: §); |
361 | if (!data) |
362 | return -1; |
363 | |
364 | if (!valid_ics_sector(data)) { |
365 | put_dev_sector(p: sect); |
366 | return 0; |
367 | } |
368 | |
369 | strlcat(p: state->pp_buf, q: " [ICS]" , PAGE_SIZE); |
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 | */ |
392 | if (size > 1 && adfspart_check_ICSLinux(state, block: start)) { |
393 | start += 1; |
394 | size -= 1; |
395 | } |
396 | } |
397 | |
398 | if (size) |
399 | put_partition(p: state, n: slot++, from: start, size); |
400 | } |
401 | |
402 | put_dev_sector(p: sect); |
403 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
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 | */ |
446 | int adfspart_check_POWERTEC(struct parsed_partitions *state) |
447 | { |
448 | Sector sect; |
449 | const unsigned char *data; |
450 | const struct ptec_part *p; |
451 | int slot = 1; |
452 | int i; |
453 | |
454 | data = read_part_sector(state, n: 0, p: §); |
455 | if (!data) |
456 | return -1; |
457 | |
458 | if (!valid_ptec_sector(data)) { |
459 | put_dev_sector(p: sect); |
460 | return 0; |
461 | } |
462 | |
463 | strlcat(p: state->pp_buf, q: " [POWERTEC]" , PAGE_SIZE); |
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(p: state, n: slot++, from: start, size); |
471 | } |
472 | |
473 | put_dev_sector(p: sect); |
474 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
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 | */ |
507 | int adfspart_check_EESOX(struct parsed_partitions *state) |
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 | |
516 | data = read_part_sector(state, n: 7, p: §); |
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(p: sect); |
527 | |
528 | for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) { |
529 | sector_t next; |
530 | |
531 | if (memcmp(p: p->magic, q: "Eesox" , size: 6)) |
532 | break; |
533 | |
534 | next = le32_to_cpu(p->start); |
535 | if (i) |
536 | put_partition(p: state, n: slot++, from: start, size: next - start); |
537 | start = next; |
538 | } |
539 | |
540 | if (i != 0) { |
541 | sector_t size; |
542 | |
543 | size = get_capacity(disk: state->disk); |
544 | put_partition(p: state, n: slot++, from: start, size: size - start); |
545 | strlcat(p: state->pp_buf, q: "\n" , PAGE_SIZE); |
546 | } |
547 | |
548 | return i ? 1 : 0; |
549 | } |
550 | #endif |
551 | |