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 *
adfs_partition(struct parsed_partitions * state,char * name,char * data,unsigned long first_sector,int slot)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)
riscix_partition(struct parsed_partitions * state,unsigned long first_sect,int slot,unsigned long nr_sects)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)
linux_partition(struct parsed_partitions * state,unsigned long first_sect,int slot,unsigned long nr_sects)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
adfspart_check_CUMANA(struct parsed_partitions * state)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 */
adfspart_check_ADFS(struct parsed_partitions * state)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
adfspart_check_ICSLinux(struct parsed_partitions * state,unsigned long block)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 */
valid_ics_sector(const unsigned char * data)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 */
adfspart_check_ICS(struct parsed_partitions * state)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
valid_ptec_sector(const unsigned char * data)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 */
adfspart_check_POWERTEC(struct parsed_partitions * state)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 */
adfspart_check_EESOX(struct parsed_partitions * state)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