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1 // SPDX-License-Identifier: GPL-2.0
3 * fs/partitions/atari.c
5 * Code extracted from drivers/block/genhd.c
7 * Copyright (C) 1991-1998 Linus Torvalds
8 * Re-organised Feb 1998 Russell King
11 #include <linux/ctype.h>
15 /* ++guenther: this should be settable by the user ("make config")?.
19 /* check if a partition entry looks valid -- Atari format is assumed if at
20 least one of the primary entries is ok this way */
21 #define VALID_PARTITION(pi,hdsiz) \
23 isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
24 be32_to_cpu((pi)->st) <= (hdsiz) && \
25 be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
27 static inline int OK_id(char *s
)
29 return memcmp (s
, "GEM", 3) == 0 || memcmp (s
, "BGM", 3) == 0 ||
30 memcmp (s
, "LNX", 3) == 0 || memcmp (s
, "SWP", 3) == 0 ||
31 memcmp (s
, "RAW", 3) == 0 ;
34 int atari_partition(struct parsed_partitions
*state
)
37 struct rootsector
*rs
;
38 struct partition_info
*pi
;
43 int part_fmt
= 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
47 * ATARI partition scheme supports 512 lba only. If this is not
48 * the case, bail early to avoid miscalculating hd_size.
50 if (bdev_logical_block_size(state
->bdev
) != 512)
53 rs
= read_part_sector(state
, 0, §
);
57 /* Verify this is an Atari rootsector: */
58 hd_size
= state
->bdev
->bd_inode
->i_size
>> 9;
59 if (!VALID_PARTITION(&rs
->part
[0], hd_size
) &&
60 !VALID_PARTITION(&rs
->part
[1], hd_size
) &&
61 !VALID_PARTITION(&rs
->part
[2], hd_size
) &&
62 !VALID_PARTITION(&rs
->part
[3], hd_size
)) {
64 * if there's no valid primary partition, assume that no Atari
65 * format partition table (there's no reliable magic or the like
73 strlcat(state
->pp_buf
, " AHDI", PAGE_SIZE
);
74 for (slot
= 1; pi
< &rs
->part
[4] && slot
< state
->limit
; slot
++, pi
++) {
75 struct rootsector
*xrs
;
81 /* active partition */
82 if (memcmp (pi
->id
, "XGM", 3) != 0) {
83 /* we don't care about other id's */
84 put_partition (state
, slot
, be32_to_cpu(pi
->st
),
85 be32_to_cpu(pi
->siz
));
88 /* extension partition */
92 strlcat(state
->pp_buf
, " XGM<", PAGE_SIZE
);
93 partsect
= extensect
= be32_to_cpu(pi
->st
);
95 xrs
= read_part_sector(state
, partsect
, §2
);
97 printk (" block %ld read failed\n", partsect
);
102 /* ++roman: sanity check: bit 0 of flg field must be set */
103 if (!(xrs
->part
[0].flg
& 1)) {
104 printk( "\nFirst sub-partition in extended partition is not valid!\n" );
105 put_dev_sector(sect2
);
109 put_partition(state
, slot
,
110 partsect
+ be32_to_cpu(xrs
->part
[0].st
),
111 be32_to_cpu(xrs
->part
[0].siz
));
113 if (!(xrs
->part
[1].flg
& 1)) {
114 /* end of linked partition list */
115 put_dev_sector(sect2
);
118 if (memcmp( xrs
->part
[1].id
, "XGM", 3 ) != 0) {
119 printk("\nID of extended partition is not XGM!\n");
120 put_dev_sector(sect2
);
124 partsect
= be32_to_cpu(xrs
->part
[1].st
) + extensect
;
125 put_dev_sector(sect2
);
126 if (++slot
== state
->limit
) {
127 printk( "\nMaximum number of partitions reached!\n" );
131 strlcat(state
->pp_buf
, " >", PAGE_SIZE
);
134 if ( part_fmt
!=1 ) { /* no extended partitions -> test ICD-format */
135 pi
= &rs
->icdpart
[0];
136 /* sanity check: no ICD format if first partition invalid */
138 strlcat(state
->pp_buf
, " ICD<", PAGE_SIZE
);
139 for (; pi
< &rs
->icdpart
[8] && slot
< state
->limit
; slot
++, pi
++) {
140 /* accept only GEM,BGM,RAW,LNX,SWP partitions */
141 if (!((pi
->flg
& 1) && OK_id(pi
->id
)))
144 put_partition (state
, slot
,
146 be32_to_cpu(pi
->siz
));
148 strlcat(state
->pp_buf
, " >", PAGE_SIZE
);
152 put_dev_sector(sect
);
154 strlcat(state
->pp_buf
, "\n", PAGE_SIZE
);