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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#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
Denver Gingerichd05e96f2007-07-15 23:39:59 -070028#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
29 defined(CONFIG_ACORN_PARTITION_ADFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030static struct adfs_discrecord *
31adfs_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 printk(" [%s]", name);
50 put_partition(state, slot, first_sector, nr_sects);
51 return dr;
52}
Denver Gingerichd05e96f2007-07-15 23:39:59 -070053#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#ifdef CONFIG_ACORN_PARTITION_RISCIX
56
57struct riscix_part {
58 __le32 start;
59 __le32 length;
60 __le32 one;
61 char name[16];
62};
63
64struct riscix_record {
65 __le32 magic;
66#define RISCIX_MAGIC cpu_to_le32(0x4a657320)
67 __le32 date;
68 struct riscix_part part[8];
69};
70
Denver Gingerichd05e96f2007-07-15 23:39:59 -070071#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
72 defined(CONFIG_ACORN_PARTITION_ADFS)
Tejun Heo1493bf22010-05-15 20:09:30 +020073static int riscix_partition(struct parsed_partitions *state,
74 unsigned long first_sect, int slot,
75 unsigned long nr_sects)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 Sector sect;
78 struct riscix_record *rr;
79
Tejun Heo1493bf22010-05-15 20:09:30 +020080 rr = read_part_sector(state, first_sect, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (!rr)
82 return -1;
83
84 printk(" [RISCiX]");
85
86
87 if (rr->magic == RISCIX_MAGIC) {
88 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
89 int part;
90
91 printk(" <");
92
93 put_partition(state, slot++, first_sect, size);
94 for (part = 0; part < 8; part++) {
95 if (rr->part[part].one &&
96 memcmp(rr->part[part].name, "All\0", 4)) {
97 put_partition(state, slot++,
98 le32_to_cpu(rr->part[part].start),
99 le32_to_cpu(rr->part[part].length));
100 printk("(%s)", rr->part[part].name);
101 }
102 }
103
104 printk(" >\n");
105 } else {
106 put_partition(state, slot++, first_sect, nr_sects);
107 }
108
109 put_dev_sector(sect);
110 return slot;
111}
112#endif
Denver Gingerichd05e96f2007-07-15 23:39:59 -0700113#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115#define LINUX_NATIVE_MAGIC 0xdeafa1de
116#define LINUX_SWAP_MAGIC 0xdeafab1e
117
118struct linux_part {
119 __le32 magic;
120 __le32 start_sect;
121 __le32 nr_sects;
122};
123
Denver Gingerichd05e96f2007-07-15 23:39:59 -0700124#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
125 defined(CONFIG_ACORN_PARTITION_ADFS)
Tejun Heo1493bf22010-05-15 20:09:30 +0200126static int linux_partition(struct parsed_partitions *state,
127 unsigned long first_sect, int slot,
128 unsigned long nr_sects)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130 Sector sect;
131 struct linux_part *linuxp;
132 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
133
134 printk(" [Linux]");
135
136 put_partition(state, slot++, first_sect, size);
137
Tejun Heo1493bf22010-05-15 20:09:30 +0200138 linuxp = read_part_sector(state, first_sect, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 if (!linuxp)
140 return -1;
141
142 printk(" <");
143 while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
144 linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
145 if (slot == state->limit)
146 break;
147 put_partition(state, slot++, first_sect +
148 le32_to_cpu(linuxp->start_sect),
149 le32_to_cpu(linuxp->nr_sects));
150 linuxp ++;
151 }
152 printk(" >");
153
154 put_dev_sector(sect);
155 return slot;
156}
Denver Gingerichd05e96f2007-07-15 23:39:59 -0700157#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159#ifdef CONFIG_ACORN_PARTITION_CUMANA
Tejun Heo1493bf22010-05-15 20:09:30 +0200160int adfspart_check_CUMANA(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 unsigned long first_sector = 0;
163 unsigned int start_blk = 0;
164 Sector sect;
165 unsigned char *data;
166 char *name = "CUMANA/ADFS";
167 int first = 1;
168 int slot = 1;
169
170 /*
171 * Try Cumana style partitions - sector 6 contains ADFS boot block
172 * with pointer to next 'drive'.
173 *
174 * There are unknowns in this code - is the 'cylinder number' of the
175 * next partition relative to the start of this one - I'm assuming
176 * it is.
177 *
178 * Also, which ID did Cumana use?
179 *
180 * This is totally unfinished, and will require more work to get it
181 * going. Hence it is totally untested.
182 */
183 do {
184 struct adfs_discrecord *dr;
185 unsigned int nr_sects;
186
Tejun Heo1493bf22010-05-15 20:09:30 +0200187 data = read_part_sector(state, start_blk * 2 + 6, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (!data)
189 return -1;
190
191 if (slot == state->limit)
192 break;
193
194 dr = adfs_partition(state, name, data, first_sector, slot++);
195 if (!dr)
196 break;
197
198 name = NULL;
199
200 nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
201 (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
202 dr->secspertrack;
203
204 if (!nr_sects)
205 break;
206
207 first = 0;
208 first_sector += nr_sects;
209 start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
210 nr_sects = 0; /* hmm - should be partition size */
211
212 switch (data[0x1fc] & 15) {
213 case 0: /* No partition / ADFS? */
214 break;
215
216#ifdef CONFIG_ACORN_PARTITION_RISCIX
217 case PARTITION_RISCIX_SCSI:
218 /* RISCiX - we don't know how to find the next one. */
Tejun Heo1493bf22010-05-15 20:09:30 +0200219 slot = riscix_partition(state, first_sector, slot,
220 nr_sects);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 break;
222#endif
223
224 case PARTITION_LINUX:
Tejun Heo1493bf22010-05-15 20:09:30 +0200225 slot = linux_partition(state, first_sector, slot,
226 nr_sects);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 break;
228 }
229 put_dev_sector(sect);
230 if (slot == -1)
231 return -1;
232 } while (1);
233 put_dev_sector(sect);
234 return first ? 0 : 1;
235}
236#endif
237
238#ifdef CONFIG_ACORN_PARTITION_ADFS
239/*
240 * Purpose: allocate ADFS partitions.
241 *
242 * Params : hd - pointer to gendisk structure to store partition info.
243 * dev - device number to access.
244 *
245 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
246 *
247 * Alloc : hda = whole drive
248 * hda1 = ADFS partition on first drive.
249 * hda2 = non-ADFS partition.
250 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200251int adfspart_check_ADFS(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
253 unsigned long start_sect, nr_sects, sectscyl, heads;
254 Sector sect;
255 unsigned char *data;
256 struct adfs_discrecord *dr;
257 unsigned char id;
258 int slot = 1;
259
Tejun Heo1493bf22010-05-15 20:09:30 +0200260 data = read_part_sector(state, 6, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (!data)
262 return -1;
263
264 dr = adfs_partition(state, "ADFS", data, 0, slot++);
265 if (!dr) {
266 put_dev_sector(sect);
267 return 0;
268 }
269
270 heads = dr->heads + ((dr->lowsector >> 6) & 1);
271 sectscyl = dr->secspertrack * heads;
272 start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
273 id = data[0x1fc] & 15;
274 put_dev_sector(sect);
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 /*
277 * Work out start of non-adfs partition.
278 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200279 nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 if (start_sect) {
282 switch (id) {
283#ifdef CONFIG_ACORN_PARTITION_RISCIX
284 case PARTITION_RISCIX_SCSI:
285 case PARTITION_RISCIX_MFM:
Tejun Heo1493bf22010-05-15 20:09:30 +0200286 slot = riscix_partition(state, start_sect, slot,
287 nr_sects);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 break;
289#endif
290
291 case PARTITION_LINUX:
Tejun Heo1493bf22010-05-15 20:09:30 +0200292 slot = linux_partition(state, start_sect, slot,
293 nr_sects);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 break;
295 }
296 }
297 printk("\n");
298 return 1;
299}
300#endif
301
302#ifdef CONFIG_ACORN_PARTITION_ICS
303
304struct ics_part {
305 __le32 start;
306 __le32 size;
307};
308
Tejun Heo1493bf22010-05-15 20:09:30 +0200309static int adfspart_check_ICSLinux(struct parsed_partitions *state,
310 unsigned long block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
312 Sector sect;
Tejun Heo1493bf22010-05-15 20:09:30 +0200313 unsigned char *data = read_part_sector(state, block, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 int result = 0;
315
316 if (data) {
317 if (memcmp(data, "LinuxPart", 9) == 0)
318 result = 1;
319 put_dev_sector(sect);
320 }
321
322 return result;
323}
324
325/*
326 * Check for a valid ICS partition using the checksum.
327 */
328static inline int valid_ics_sector(const unsigned char *data)
329{
330 unsigned long sum;
331 int i;
332
333 for (i = 0, sum = 0x50617274; i < 508; i++)
334 sum += data[i];
335
336 sum -= le32_to_cpu(*(__le32 *)(&data[508]));
337
338 return sum == 0;
339}
340
341/*
342 * Purpose: allocate ICS partitions.
343 * Params : hd - pointer to gendisk structure to store partition info.
344 * dev - device number to access.
345 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
346 * Alloc : hda = whole drive
347 * hda1 = ADFS partition 0 on first drive.
348 * hda2 = ADFS partition 1 on first drive.
349 * ..etc..
350 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200351int adfspart_check_ICS(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
353 const unsigned char *data;
354 const struct ics_part *p;
355 int slot;
356 Sector sect;
357
358 /*
359 * Try ICS style partitions - sector 0 contains partition info.
360 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200361 data = read_part_sector(state, 0, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (!data)
363 return -1;
364
365 if (!valid_ics_sector(data)) {
366 put_dev_sector(sect);
367 return 0;
368 }
369
370 printk(" [ICS]");
371
372 for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
373 u32 start = le32_to_cpu(p->start);
374 s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
375
376 if (slot == state->limit)
377 break;
378
379 /*
380 * Negative sizes tell the RISC OS ICS driver to ignore
381 * this partition - in effect it says that this does not
382 * contain an ADFS filesystem.
383 */
384 if (size < 0) {
385 size = -size;
386
387 /*
388 * Our own extension - We use the first sector
389 * of the partition to identify what type this
390 * partition is. We must not make this visible
391 * to the filesystem.
392 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200393 if (size > 1 && adfspart_check_ICSLinux(state, start)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 start += 1;
395 size -= 1;
396 }
397 }
398
399 if (size)
400 put_partition(state, slot++, start, size);
401 }
402
403 put_dev_sector(sect);
404 printk("\n");
405 return 1;
406}
407#endif
408
409#ifdef CONFIG_ACORN_PARTITION_POWERTEC
410struct ptec_part {
411 __le32 unused1;
412 __le32 unused2;
413 __le32 start;
414 __le32 size;
415 __le32 unused5;
416 char type[8];
417};
418
419static inline int valid_ptec_sector(const unsigned char *data)
420{
421 unsigned char checksum = 0x2a;
422 int i;
423
424 /*
425 * If it looks like a PC/BIOS partition, then it
426 * probably isn't PowerTec.
427 */
428 if (data[510] == 0x55 && data[511] == 0xaa)
429 return 0;
430
431 for (i = 0; i < 511; i++)
432 checksum += data[i];
433
434 return checksum == data[511];
435}
436
437/*
438 * Purpose: allocate ICS partitions.
439 * Params : hd - pointer to gendisk structure to store partition info.
440 * dev - device number to access.
441 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
442 * Alloc : hda = whole drive
443 * hda1 = ADFS partition 0 on first drive.
444 * hda2 = ADFS partition 1 on first drive.
445 * ..etc..
446 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200447int adfspart_check_POWERTEC(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
449 Sector sect;
450 const unsigned char *data;
451 const struct ptec_part *p;
452 int slot = 1;
453 int i;
454
Tejun Heo1493bf22010-05-15 20:09:30 +0200455 data = read_part_sector(state, 0, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (!data)
457 return -1;
458
459 if (!valid_ptec_sector(data)) {
460 put_dev_sector(sect);
461 return 0;
462 }
463
464 printk(" [POWERTEC]");
465
466 for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
467 u32 start = le32_to_cpu(p->start);
468 u32 size = le32_to_cpu(p->size);
469
470 if (size)
471 put_partition(state, slot++, start, size);
472 }
473
474 put_dev_sector(sect);
475 printk("\n");
476 return 1;
477}
478#endif
479
480#ifdef CONFIG_ACORN_PARTITION_EESOX
481struct eesox_part {
482 char magic[6];
483 char name[10];
484 __le32 start;
485 __le32 unused6;
486 __le32 unused7;
487 __le32 unused8;
488};
489
490/*
491 * Guess who created this format?
492 */
493static const char eesox_name[] = {
494 'N', 'e', 'i', 'l', ' ',
495 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
496};
497
498/*
499 * EESOX SCSI partition format.
500 *
501 * This is a goddamned awful partition format. We don't seem to store
502 * the size of the partition in this table, only the start addresses.
503 *
504 * There are two possibilities where the size comes from:
505 * 1. The individual ADFS boot block entries that are placed on the disk.
506 * 2. The start address of the next entry.
507 */
Tejun Heo1493bf22010-05-15 20:09:30 +0200508int adfspart_check_EESOX(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
510 Sector sect;
511 const unsigned char *data;
512 unsigned char buffer[256];
513 struct eesox_part *p;
514 sector_t start = 0;
515 int i, slot = 1;
516
Tejun Heo1493bf22010-05-15 20:09:30 +0200517 data = read_part_sector(state, 7, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (!data)
519 return -1;
520
521 /*
522 * "Decrypt" the partition table. God knows why...
523 */
524 for (i = 0; i < 256; i++)
525 buffer[i] = data[i] ^ eesox_name[i & 15];
526
527 put_dev_sector(sect);
528
529 for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
530 sector_t next;
531
532 if (memcmp(p->magic, "Eesox", 6))
533 break;
534
535 next = le32_to_cpu(p->start);
536 if (i)
537 put_partition(state, slot++, start, next - start);
538 start = next;
539 }
540
541 if (i != 0) {
542 sector_t size;
543
Tejun Heo1493bf22010-05-15 20:09:30 +0200544 size = get_capacity(state->bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 put_partition(state, slot++, start, size - start);
546 printk("\n");
547 }
548
549 return i ? 1 : 0;
550}
551#endif