2 * linux/fs/partitions/acorn.c
4 * Copyright (c) 1996-2000 Russell King.
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.
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
15 #include <linux/buffer_head.h>
16 #include <linux/adfs_fs.h>
22 * Partition types. (Oh for reusability)
24 #define PARTITION_RISCIX_MFM 1
25 #define PARTITION_RISCIX_SCSI 2
26 #define PARTITION_LINUX 9
28 #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
29 defined(CONFIG_ACORN_PARTITION_ADFS)
30 static struct adfs_discrecord
*
31 adfs_partition(struct parsed_partitions
*state
, char *name
, char *data
,
32 unsigned long first_sector
, int slot
)
34 struct adfs_discrecord
*dr
;
35 unsigned int nr_sects
;
37 if (adfs_checkbblk(data
))
40 dr
= (struct adfs_discrecord
*)(data
+ 0x1c0);
42 if (dr
->disc_size
== 0 && dr
->disc_size_high
== 0)
45 nr_sects
= (le32_to_cpu(dr
->disc_size_high
) << 23) |
46 (le32_to_cpu(dr
->disc_size
) >> 9);
49 printk(" [%s]", name
);
50 put_partition(state
, slot
, first_sector
, nr_sects
);
55 #ifdef CONFIG_ACORN_PARTITION_RISCIX
64 struct riscix_record
{
66 #define RISCIX_MAGIC cpu_to_le32(0x4a657320)
68 struct riscix_part part
[8];
71 #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
72 defined(CONFIG_ACORN_PARTITION_ADFS)
74 riscix_partition(struct parsed_partitions
*state
, struct block_device
*bdev
,
75 unsigned long first_sect
, int slot
, unsigned long nr_sects
)
78 struct riscix_record
*rr
;
80 rr
= (struct riscix_record
*)read_dev_sector(bdev
, first_sect
, §
);
87 if (rr
->magic
== RISCIX_MAGIC
) {
88 unsigned long size
= nr_sects
> 2 ? 2 : nr_sects
;
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
);
106 put_partition(state
, slot
++, first_sect
, nr_sects
);
109 put_dev_sector(sect
);
115 #define LINUX_NATIVE_MAGIC 0xdeafa1de
116 #define LINUX_SWAP_MAGIC 0xdeafab1e
124 #if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
125 defined(CONFIG_ACORN_PARTITION_ADFS)
127 linux_partition(struct parsed_partitions
*state
, struct block_device
*bdev
,
128 unsigned long first_sect
, int slot
, unsigned long nr_sects
)
131 struct linux_part
*linuxp
;
132 unsigned long size
= nr_sects
> 2 ? 2 : nr_sects
;
136 put_partition(state
, slot
++, first_sect
, size
);
138 linuxp
= (struct linux_part
*)read_dev_sector(bdev
, first_sect
, §
);
143 while (linuxp
->magic
== cpu_to_le32(LINUX_NATIVE_MAGIC
) ||
144 linuxp
->magic
== cpu_to_le32(LINUX_SWAP_MAGIC
)) {
145 if (slot
== state
->limit
)
147 put_partition(state
, slot
++, first_sect
+
148 le32_to_cpu(linuxp
->start_sect
),
149 le32_to_cpu(linuxp
->nr_sects
));
154 put_dev_sector(sect
);
159 #ifdef CONFIG_ACORN_PARTITION_CUMANA
161 adfspart_check_CUMANA(struct parsed_partitions
*state
, struct block_device
*bdev
)
163 unsigned long first_sector
= 0;
164 unsigned int start_blk
= 0;
167 char *name
= "CUMANA/ADFS";
172 * Try Cumana style partitions - sector 6 contains ADFS boot block
173 * with pointer to next 'drive'.
175 * There are unknowns in this code - is the 'cylinder number' of the
176 * next partition relative to the start of this one - I'm assuming
179 * Also, which ID did Cumana use?
181 * This is totally unfinished, and will require more work to get it
182 * going. Hence it is totally untested.
185 struct adfs_discrecord
*dr
;
186 unsigned int nr_sects
;
188 data
= read_dev_sector(bdev
, start_blk
* 2 + 6, §
);
192 if (slot
== state
->limit
)
195 dr
= adfs_partition(state
, name
, data
, first_sector
, slot
++);
201 nr_sects
= (data
[0x1fd] + (data
[0x1fe] << 8)) *
202 (dr
->heads
+ (dr
->lowsector
& 0x40 ? 1 : 0)) *
209 first_sector
+= nr_sects
;
210 start_blk
+= nr_sects
>> (BLOCK_SIZE_BITS
- 9);
211 nr_sects
= 0; /* hmm - should be partition size */
213 switch (data
[0x1fc] & 15) {
214 case 0: /* No partition / ADFS? */
217 #ifdef CONFIG_ACORN_PARTITION_RISCIX
218 case PARTITION_RISCIX_SCSI
:
219 /* RISCiX - we don't know how to find the next one. */
220 slot
= riscix_partition(state
, bdev
, first_sector
,
225 case PARTITION_LINUX
:
226 slot
= linux_partition(state
, bdev
, first_sector
,
230 put_dev_sector(sect
);
234 put_dev_sector(sect
);
235 return first
? 0 : 1;
239 #ifdef CONFIG_ACORN_PARTITION_ADFS
241 * Purpose: allocate ADFS partitions.
243 * Params : hd - pointer to gendisk structure to store partition info.
244 * dev - device number to access.
246 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
248 * Alloc : hda = whole drive
249 * hda1 = ADFS partition on first drive.
250 * hda2 = non-ADFS partition.
253 adfspart_check_ADFS(struct parsed_partitions
*state
, struct block_device
*bdev
)
255 unsigned long start_sect
, nr_sects
, sectscyl
, heads
;
258 struct adfs_discrecord
*dr
;
262 data
= read_dev_sector(bdev
, 6, §
);
266 dr
= adfs_partition(state
, "ADFS", data
, 0, slot
++);
268 put_dev_sector(sect
);
272 heads
= dr
->heads
+ ((dr
->lowsector
>> 6) & 1);
273 sectscyl
= dr
->secspertrack
* heads
;
274 start_sect
= ((data
[0x1fe] << 8) + data
[0x1fd]) * sectscyl
;
275 id
= data
[0x1fc] & 15;
276 put_dev_sector(sect
);
278 #ifdef CONFIG_BLK_DEV_MFM
279 if (MAJOR(bdev
->bd_dev
) == MFM_ACORN_MAJOR
) {
280 extern void xd_set_geometry(struct block_device
*,
281 unsigned char, unsigned char, unsigned int);
282 xd_set_geometry(bdev
, dr
->secspertrack
, heads
, 1);
283 invalidate_bh_lrus();
284 truncate_inode_pages(bdev
->bd_inode
->i_mapping
, 0);
289 * Work out start of non-adfs partition.
291 nr_sects
= (bdev
->bd_inode
->i_size
>> 9) - start_sect
;
295 #ifdef CONFIG_ACORN_PARTITION_RISCIX
296 case PARTITION_RISCIX_SCSI
:
297 case PARTITION_RISCIX_MFM
:
298 slot
= riscix_partition(state
, bdev
, start_sect
,
303 case PARTITION_LINUX
:
304 slot
= linux_partition(state
, bdev
, start_sect
,
314 #ifdef CONFIG_ACORN_PARTITION_ICS
321 static int adfspart_check_ICSLinux(struct block_device
*bdev
, unsigned long block
)
324 unsigned char *data
= read_dev_sector(bdev
, block
, §
);
328 if (memcmp(data
, "LinuxPart", 9) == 0)
330 put_dev_sector(sect
);
337 * Check for a valid ICS partition using the checksum.
339 static inline int valid_ics_sector(const unsigned char *data
)
344 for (i
= 0, sum
= 0x50617274; i
< 508; i
++)
347 sum
-= le32_to_cpu(*(__le32
*)(&data
[508]));
353 * Purpose: allocate ICS partitions.
354 * Params : hd - pointer to gendisk structure to store partition info.
355 * dev - device number to access.
356 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
357 * Alloc : hda = whole drive
358 * hda1 = ADFS partition 0 on first drive.
359 * hda2 = ADFS partition 1 on first drive.
363 adfspart_check_ICS(struct parsed_partitions
*state
, struct block_device
*bdev
)
365 const unsigned char *data
;
366 const struct ics_part
*p
;
371 * Try ICS style partitions - sector 0 contains partition info.
373 data
= read_dev_sector(bdev
, 0, §
);
377 if (!valid_ics_sector(data
)) {
378 put_dev_sector(sect
);
384 for (slot
= 1, p
= (const struct ics_part
*)data
; p
->size
; p
++) {
385 u32 start
= le32_to_cpu(p
->start
);
386 s32 size
= le32_to_cpu(p
->size
); /* yes, it's signed. */
388 if (slot
== state
->limit
)
392 * Negative sizes tell the RISC OS ICS driver to ignore
393 * this partition - in effect it says that this does not
394 * contain an ADFS filesystem.
400 * Our own extension - We use the first sector
401 * of the partition to identify what type this
402 * partition is. We must not make this visible
405 if (size
> 1 && adfspart_check_ICSLinux(bdev
, start
)) {
412 put_partition(state
, slot
++, start
, size
);
415 put_dev_sector(sect
);
421 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
431 static inline int valid_ptec_sector(const unsigned char *data
)
433 unsigned char checksum
= 0x2a;
437 * If it looks like a PC/BIOS partition, then it
438 * probably isn't PowerTec.
440 if (data
[510] == 0x55 && data
[511] == 0xaa)
443 for (i
= 0; i
< 511; i
++)
446 return checksum
== data
[511];
450 * Purpose: allocate ICS partitions.
451 * Params : hd - pointer to gendisk structure to store partition info.
452 * dev - device number to access.
453 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
454 * Alloc : hda = whole drive
455 * hda1 = ADFS partition 0 on first drive.
456 * hda2 = ADFS partition 1 on first drive.
460 adfspart_check_POWERTEC(struct parsed_partitions
*state
, struct block_device
*bdev
)
463 const unsigned char *data
;
464 const struct ptec_part
*p
;
468 data
= read_dev_sector(bdev
, 0, §
);
472 if (!valid_ptec_sector(data
)) {
473 put_dev_sector(sect
);
477 printk(" [POWERTEC]");
479 for (i
= 0, p
= (const struct ptec_part
*)data
; i
< 12; i
++, p
++) {
480 u32 start
= le32_to_cpu(p
->start
);
481 u32 size
= le32_to_cpu(p
->size
);
484 put_partition(state
, slot
++, start
, size
);
487 put_dev_sector(sect
);
493 #ifdef CONFIG_ACORN_PARTITION_EESOX
504 * Guess who created this format?
506 static const char eesox_name
[] = {
507 'N', 'e', 'i', 'l', ' ',
508 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
512 * EESOX SCSI partition format.
514 * This is a goddamned awful partition format. We don't seem to store
515 * the size of the partition in this table, only the start addresses.
517 * There are two possibilities where the size comes from:
518 * 1. The individual ADFS boot block entries that are placed on the disk.
519 * 2. The start address of the next entry.
522 adfspart_check_EESOX(struct parsed_partitions
*state
, struct block_device
*bdev
)
525 const unsigned char *data
;
526 unsigned char buffer
[256];
527 struct eesox_part
*p
;
531 data
= read_dev_sector(bdev
, 7, §
);
536 * "Decrypt" the partition table. God knows why...
538 for (i
= 0; i
< 256; i
++)
539 buffer
[i
] = data
[i
] ^ eesox_name
[i
& 15];
541 put_dev_sector(sect
);
543 for (i
= 0, p
= (struct eesox_part
*)buffer
; i
< 8; i
++, p
++) {
546 if (memcmp(p
->magic
, "Eesox", 6))
549 next
= le32_to_cpu(p
->start
);
551 put_partition(state
, slot
++, start
, next
- start
);
558 size
= get_capacity(bdev
->bd_disk
);
559 put_partition(state
, slot
++, start
, size
- start
);
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