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1da177e4 LT |
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/config.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/adfs_fs.h> | |
18 | ||
19 | #include "check.h" | |
20 | #include "acorn.h" | |
21 | ||
22 | /* | |
23 | * Partition types. (Oh for reusability) | |
24 | */ | |
25 | #define PARTITION_RISCIX_MFM 1 | |
26 | #define PARTITION_RISCIX_SCSI 2 | |
27 | #define PARTITION_LINUX 9 | |
28 | ||
29 | static struct adfs_discrecord * | |
30 | adfs_partition(struct parsed_partitions *state, char *name, char *data, | |
31 | unsigned long first_sector, int slot) | |
32 | { | |
33 | struct adfs_discrecord *dr; | |
34 | unsigned int nr_sects; | |
35 | ||
36 | if (adfs_checkbblk(data)) | |
37 | return NULL; | |
38 | ||
39 | dr = (struct adfs_discrecord *)(data + 0x1c0); | |
40 | ||
41 | if (dr->disc_size == 0 && dr->disc_size_high == 0) | |
42 | return NULL; | |
43 | ||
44 | nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) | | |
45 | (le32_to_cpu(dr->disc_size) >> 9); | |
46 | ||
47 | if (name) | |
48 | printk(" [%s]", name); | |
49 | put_partition(state, slot, first_sector, nr_sects); | |
50 | return dr; | |
51 | } | |
52 | ||
53 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
54 | ||
55 | struct riscix_part { | |
56 | __le32 start; | |
57 | __le32 length; | |
58 | __le32 one; | |
59 | char name[16]; | |
60 | }; | |
61 | ||
62 | struct riscix_record { | |
63 | __le32 magic; | |
64 | #define RISCIX_MAGIC cpu_to_le32(0x4a657320) | |
65 | __le32 date; | |
66 | struct riscix_part part[8]; | |
67 | }; | |
68 | ||
69 | static int | |
70 | riscix_partition(struct parsed_partitions *state, struct block_device *bdev, | |
71 | unsigned long first_sect, int slot, unsigned long nr_sects) | |
72 | { | |
73 | Sector sect; | |
74 | struct riscix_record *rr; | |
75 | ||
76 | rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, §); | |
77 | if (!rr) | |
78 | return -1; | |
79 | ||
80 | printk(" [RISCiX]"); | |
81 | ||
82 | ||
83 | if (rr->magic == RISCIX_MAGIC) { | |
84 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; | |
85 | int part; | |
86 | ||
87 | printk(" <"); | |
88 | ||
89 | put_partition(state, slot++, first_sect, size); | |
90 | for (part = 0; part < 8; part++) { | |
91 | if (rr->part[part].one && | |
92 | memcmp(rr->part[part].name, "All\0", 4)) { | |
93 | put_partition(state, slot++, | |
94 | le32_to_cpu(rr->part[part].start), | |
95 | le32_to_cpu(rr->part[part].length)); | |
96 | printk("(%s)", rr->part[part].name); | |
97 | } | |
98 | } | |
99 | ||
100 | printk(" >\n"); | |
101 | } else { | |
102 | put_partition(state, slot++, first_sect, nr_sects); | |
103 | } | |
104 | ||
105 | put_dev_sector(sect); | |
106 | return slot; | |
107 | } | |
108 | #endif | |
109 | ||
110 | #define LINUX_NATIVE_MAGIC 0xdeafa1de | |
111 | #define LINUX_SWAP_MAGIC 0xdeafab1e | |
112 | ||
113 | struct linux_part { | |
114 | __le32 magic; | |
115 | __le32 start_sect; | |
116 | __le32 nr_sects; | |
117 | }; | |
118 | ||
119 | static int | |
120 | linux_partition(struct parsed_partitions *state, struct block_device *bdev, | |
121 | unsigned long first_sect, int slot, unsigned long nr_sects) | |
122 | { | |
123 | Sector sect; | |
124 | struct linux_part *linuxp; | |
125 | unsigned long size = nr_sects > 2 ? 2 : nr_sects; | |
126 | ||
127 | printk(" [Linux]"); | |
128 | ||
129 | put_partition(state, slot++, first_sect, size); | |
130 | ||
131 | linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, §); | |
132 | if (!linuxp) | |
133 | return -1; | |
134 | ||
135 | printk(" <"); | |
136 | while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) || | |
137 | linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) { | |
138 | if (slot == state->limit) | |
139 | break; | |
140 | put_partition(state, slot++, first_sect + | |
141 | le32_to_cpu(linuxp->start_sect), | |
142 | le32_to_cpu(linuxp->nr_sects)); | |
143 | linuxp ++; | |
144 | } | |
145 | printk(" >"); | |
146 | ||
147 | put_dev_sector(sect); | |
148 | return slot; | |
149 | } | |
150 | ||
151 | #ifdef CONFIG_ACORN_PARTITION_CUMANA | |
152 | int | |
153 | adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev) | |
154 | { | |
155 | unsigned long first_sector = 0; | |
156 | unsigned int start_blk = 0; | |
157 | Sector sect; | |
158 | unsigned char *data; | |
159 | char *name = "CUMANA/ADFS"; | |
160 | int first = 1; | |
161 | int slot = 1; | |
162 | ||
163 | /* | |
164 | * Try Cumana style partitions - sector 6 contains ADFS boot block | |
165 | * with pointer to next 'drive'. | |
166 | * | |
167 | * There are unknowns in this code - is the 'cylinder number' of the | |
168 | * next partition relative to the start of this one - I'm assuming | |
169 | * it is. | |
170 | * | |
171 | * Also, which ID did Cumana use? | |
172 | * | |
173 | * This is totally unfinished, and will require more work to get it | |
174 | * going. Hence it is totally untested. | |
175 | */ | |
176 | do { | |
177 | struct adfs_discrecord *dr; | |
178 | unsigned int nr_sects; | |
179 | ||
180 | data = read_dev_sector(bdev, start_blk * 2 + 6, §); | |
181 | if (!data) | |
182 | return -1; | |
183 | ||
184 | if (slot == state->limit) | |
185 | break; | |
186 | ||
187 | dr = adfs_partition(state, name, data, first_sector, slot++); | |
188 | if (!dr) | |
189 | break; | |
190 | ||
191 | name = NULL; | |
192 | ||
193 | nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) * | |
194 | (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) * | |
195 | dr->secspertrack; | |
196 | ||
197 | if (!nr_sects) | |
198 | break; | |
199 | ||
200 | first = 0; | |
201 | first_sector += nr_sects; | |
202 | start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9); | |
203 | nr_sects = 0; /* hmm - should be partition size */ | |
204 | ||
205 | switch (data[0x1fc] & 15) { | |
206 | case 0: /* No partition / ADFS? */ | |
207 | break; | |
208 | ||
209 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
210 | case PARTITION_RISCIX_SCSI: | |
211 | /* RISCiX - we don't know how to find the next one. */ | |
212 | slot = riscix_partition(state, bdev, first_sector, | |
213 | slot, nr_sects); | |
214 | break; | |
215 | #endif | |
216 | ||
217 | case PARTITION_LINUX: | |
218 | slot = linux_partition(state, bdev, first_sector, | |
219 | slot, nr_sects); | |
220 | break; | |
221 | } | |
222 | put_dev_sector(sect); | |
223 | if (slot == -1) | |
224 | return -1; | |
225 | } while (1); | |
226 | put_dev_sector(sect); | |
227 | return first ? 0 : 1; | |
228 | } | |
229 | #endif | |
230 | ||
231 | #ifdef CONFIG_ACORN_PARTITION_ADFS | |
232 | /* | |
233 | * Purpose: allocate ADFS partitions. | |
234 | * | |
235 | * Params : hd - pointer to gendisk structure to store partition info. | |
236 | * dev - device number to access. | |
237 | * | |
238 | * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok. | |
239 | * | |
240 | * Alloc : hda = whole drive | |
241 | * hda1 = ADFS partition on first drive. | |
242 | * hda2 = non-ADFS partition. | |
243 | */ | |
244 | int | |
245 | adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev) | |
246 | { | |
247 | unsigned long start_sect, nr_sects, sectscyl, heads; | |
248 | Sector sect; | |
249 | unsigned char *data; | |
250 | struct adfs_discrecord *dr; | |
251 | unsigned char id; | |
252 | int slot = 1; | |
253 | ||
254 | data = read_dev_sector(bdev, 6, §); | |
255 | if (!data) | |
256 | return -1; | |
257 | ||
258 | dr = adfs_partition(state, "ADFS", data, 0, slot++); | |
259 | if (!dr) { | |
260 | put_dev_sector(sect); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | heads = dr->heads + ((dr->lowsector >> 6) & 1); | |
265 | sectscyl = dr->secspertrack * heads; | |
266 | start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl; | |
267 | id = data[0x1fc] & 15; | |
268 | put_dev_sector(sect); | |
269 | ||
270 | #ifdef CONFIG_BLK_DEV_MFM | |
271 | if (MAJOR(bdev->bd_dev) == MFM_ACORN_MAJOR) { | |
272 | extern void xd_set_geometry(struct block_device *, | |
273 | unsigned char, unsigned char, unsigned int); | |
274 | xd_set_geometry(bdev, dr->secspertrack, heads, 1); | |
275 | invalidate_bdev(bdev, 1); | |
276 | truncate_inode_pages(bdev->bd_inode->i_mapping, 0); | |
277 | } | |
278 | #endif | |
279 | ||
280 | /* | |
281 | * Work out start of non-adfs partition. | |
282 | */ | |
283 | nr_sects = (bdev->bd_inode->i_size >> 9) - start_sect; | |
284 | ||
285 | if (start_sect) { | |
286 | switch (id) { | |
287 | #ifdef CONFIG_ACORN_PARTITION_RISCIX | |
288 | case PARTITION_RISCIX_SCSI: | |
289 | case PARTITION_RISCIX_MFM: | |
290 | slot = riscix_partition(state, bdev, start_sect, | |
291 | slot, nr_sects); | |
292 | break; | |
293 | #endif | |
294 | ||
295 | case PARTITION_LINUX: | |
296 | slot = linux_partition(state, bdev, start_sect, | |
297 | slot, nr_sects); | |
298 | break; | |
299 | } | |
300 | } | |
301 | printk("\n"); | |
302 | return 1; | |
303 | } | |
304 | #endif | |
305 | ||
306 | #ifdef CONFIG_ACORN_PARTITION_ICS | |
307 | ||
308 | struct ics_part { | |
309 | __le32 start; | |
310 | __le32 size; | |
311 | }; | |
312 | ||
313 | static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block) | |
314 | { | |
315 | Sector sect; | |
316 | unsigned char *data = read_dev_sector(bdev, block, §); | |
317 | int result = 0; | |
318 | ||
319 | if (data) { | |
320 | if (memcmp(data, "LinuxPart", 9) == 0) | |
321 | result = 1; | |
322 | put_dev_sector(sect); | |
323 | } | |
324 | ||
325 | return result; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Check for a valid ICS partition using the checksum. | |
330 | */ | |
331 | static inline int valid_ics_sector(const unsigned char *data) | |
332 | { | |
333 | unsigned long sum; | |
334 | int i; | |
335 | ||
336 | for (i = 0, sum = 0x50617274; i < 508; i++) | |
337 | sum += data[i]; | |
338 | ||
339 | sum -= le32_to_cpu(*(__le32 *)(&data[508])); | |
340 | ||
341 | return sum == 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Purpose: allocate ICS partitions. | |
346 | * Params : hd - pointer to gendisk structure to store partition info. | |
347 | * dev - device number to access. | |
348 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. | |
349 | * Alloc : hda = whole drive | |
350 | * hda1 = ADFS partition 0 on first drive. | |
351 | * hda2 = ADFS partition 1 on first drive. | |
352 | * ..etc.. | |
353 | */ | |
354 | int | |
355 | adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev) | |
356 | { | |
357 | const unsigned char *data; | |
358 | const struct ics_part *p; | |
359 | int slot; | |
360 | Sector sect; | |
361 | ||
362 | /* | |
363 | * Try ICS style partitions - sector 0 contains partition info. | |
364 | */ | |
365 | data = read_dev_sector(bdev, 0, §); | |
366 | if (!data) | |
367 | return -1; | |
368 | ||
369 | if (!valid_ics_sector(data)) { | |
370 | put_dev_sector(sect); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | printk(" [ICS]"); | |
375 | ||
376 | for (slot = 1, p = (const struct ics_part *)data; p->size; p++) { | |
377 | u32 start = le32_to_cpu(p->start); | |
378 | s32 size = le32_to_cpu(p->size); /* yes, it's signed. */ | |
379 | ||
380 | if (slot == state->limit) | |
381 | break; | |
382 | ||
383 | /* | |
384 | * Negative sizes tell the RISC OS ICS driver to ignore | |
385 | * this partition - in effect it says that this does not | |
386 | * contain an ADFS filesystem. | |
387 | */ | |
388 | if (size < 0) { | |
389 | size = -size; | |
390 | ||
391 | /* | |
392 | * Our own extension - We use the first sector | |
393 | * of the partition to identify what type this | |
394 | * partition is. We must not make this visible | |
395 | * to the filesystem. | |
396 | */ | |
397 | if (size > 1 && adfspart_check_ICSLinux(bdev, start)) { | |
398 | start += 1; | |
399 | size -= 1; | |
400 | } | |
401 | } | |
402 | ||
403 | if (size) | |
404 | put_partition(state, slot++, start, size); | |
405 | } | |
406 | ||
407 | put_dev_sector(sect); | |
408 | printk("\n"); | |
409 | return 1; | |
410 | } | |
411 | #endif | |
412 | ||
413 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC | |
414 | struct ptec_part { | |
415 | __le32 unused1; | |
416 | __le32 unused2; | |
417 | __le32 start; | |
418 | __le32 size; | |
419 | __le32 unused5; | |
420 | char type[8]; | |
421 | }; | |
422 | ||
423 | static inline int valid_ptec_sector(const unsigned char *data) | |
424 | { | |
425 | unsigned char checksum = 0x2a; | |
426 | int i; | |
427 | ||
428 | /* | |
429 | * If it looks like a PC/BIOS partition, then it | |
430 | * probably isn't PowerTec. | |
431 | */ | |
432 | if (data[510] == 0x55 && data[511] == 0xaa) | |
433 | return 0; | |
434 | ||
435 | for (i = 0; i < 511; i++) | |
436 | checksum += data[i]; | |
437 | ||
438 | return checksum == data[511]; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Purpose: allocate ICS partitions. | |
443 | * Params : hd - pointer to gendisk structure to store partition info. | |
444 | * dev - device number to access. | |
445 | * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok. | |
446 | * Alloc : hda = whole drive | |
447 | * hda1 = ADFS partition 0 on first drive. | |
448 | * hda2 = ADFS partition 1 on first drive. | |
449 | * ..etc.. | |
450 | */ | |
451 | int | |
452 | adfspart_check_POWERTEC(struct parsed_partitions *state, struct block_device *bdev) | |
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_dev_sector(bdev, 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 | printk(" [POWERTEC]"); | |
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 | printk("\n"); | |
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 | |
514 | adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev) | |
515 | { | |
516 | Sector sect; | |
517 | const unsigned char *data; | |
518 | unsigned char buffer[256]; | |
519 | struct eesox_part *p; | |
520 | sector_t start = 0; | |
521 | int i, slot = 1; | |
522 | ||
523 | data = read_dev_sector(bdev, 7, §); | |
524 | if (!data) | |
525 | return -1; | |
526 | ||
527 | /* | |
528 | * "Decrypt" the partition table. God knows why... | |
529 | */ | |
530 | for (i = 0; i < 256; i++) | |
531 | buffer[i] = data[i] ^ eesox_name[i & 15]; | |
532 | ||
533 | put_dev_sector(sect); | |
534 | ||
535 | for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) { | |
536 | sector_t next; | |
537 | ||
538 | if (memcmp(p->magic, "Eesox", 6)) | |
539 | break; | |
540 | ||
541 | next = le32_to_cpu(p->start); | |
542 | if (i) | |
543 | put_partition(state, slot++, start, next - start); | |
544 | start = next; | |
545 | } | |
546 | ||
547 | if (i != 0) { | |
548 | sector_t size; | |
549 | ||
550 | size = get_capacity(bdev->bd_disk); | |
551 | put_partition(state, slot++, start, size - start); | |
552 | printk("\n"); | |
553 | } | |
554 | ||
555 | return i ? 1 : 0; | |
556 | } | |
557 | #endif |