1 /*
2 * fs/partitions/atari.c
3 *
4 * Code extracted from drivers/block/genhd.c
5 *
6 * Copyright (C) 1991-1998 Linus Torvalds
7 * Re-organised Feb 1998 Russell King
8 */
9
10 #include <linux/ctype.h>
11 #include "check.h"
12 #include "atari.h"
13
14 /* ++guenther: this should be settable by the user ("make config")?.
15 */
16 #define ICD_PARTS
17
18 /* check if a partition entry looks valid -- Atari format is assumed if at
19 least one of the primary entries is ok this way */
20 #define VALID_PARTITION(pi,hdsiz) \
21 (((pi)->flg & 1) && \
22 isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
23 be32_to_cpu((pi)->st) <= (hdsiz) && \
24 be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
25
OK_id(char * s)26 static inline int OK_id(char *s)
27 {
28 return memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
29 memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
30 memcmp (s, "RAW", 3) == 0 ;
31 }
32
atari_partition(struct parsed_partitions * state)33 int atari_partition(struct parsed_partitions *state)
34 {
35 Sector sect;
36 struct rootsector *rs;
37 struct partition_info *pi;
38 u32 extensect;
39 u32 hd_size;
40 int slot;
41 #ifdef ICD_PARTS
42 int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
43 #endif
44
45 rs = read_part_sector(state, 0, §);
46 if (!rs)
47 return -1;
48
49 /* Verify this is an Atari rootsector: */
50 hd_size = state->bdev->bd_inode->i_size >> 9;
51 if (!VALID_PARTITION(&rs->part[0], hd_size) &&
52 !VALID_PARTITION(&rs->part[1], hd_size) &&
53 !VALID_PARTITION(&rs->part[2], hd_size) &&
54 !VALID_PARTITION(&rs->part[3], hd_size)) {
55 /*
56 * if there's no valid primary partition, assume that no Atari
57 * format partition table (there's no reliable magic or the like
58 * :-()
59 */
60 put_dev_sector(sect);
61 return 0;
62 }
63
64 pi = &rs->part[0];
65 strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
66 for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
67 struct rootsector *xrs;
68 Sector sect2;
69 ulong partsect;
70
71 if ( !(pi->flg & 1) )
72 continue;
73 /* active partition */
74 if (memcmp (pi->id, "XGM", 3) != 0) {
75 /* we don't care about other id's */
76 put_partition (state, slot, be32_to_cpu(pi->st),
77 be32_to_cpu(pi->siz));
78 continue;
79 }
80 /* extension partition */
81 #ifdef ICD_PARTS
82 part_fmt = 1;
83 #endif
84 strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
85 partsect = extensect = be32_to_cpu(pi->st);
86 while (1) {
87 xrs = read_part_sector(state, partsect, §2);
88 if (!xrs) {
89 printk (" block %ld read failed\n", partsect);
90 put_dev_sector(sect);
91 return -1;
92 }
93
94 /* ++roman: sanity check: bit 0 of flg field must be set */
95 if (!(xrs->part[0].flg & 1)) {
96 printk( "\nFirst sub-partition in extended partition is not valid!\n" );
97 put_dev_sector(sect2);
98 break;
99 }
100
101 put_partition(state, slot,
102 partsect + be32_to_cpu(xrs->part[0].st),
103 be32_to_cpu(xrs->part[0].siz));
104
105 if (!(xrs->part[1].flg & 1)) {
106 /* end of linked partition list */
107 put_dev_sector(sect2);
108 break;
109 }
110 if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
111 printk("\nID of extended partition is not XGM!\n");
112 put_dev_sector(sect2);
113 break;
114 }
115
116 partsect = be32_to_cpu(xrs->part[1].st) + extensect;
117 put_dev_sector(sect2);
118 if (++slot == state->limit) {
119 printk( "\nMaximum number of partitions reached!\n" );
120 break;
121 }
122 }
123 strlcat(state->pp_buf, " >", PAGE_SIZE);
124 }
125 #ifdef ICD_PARTS
126 if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
127 pi = &rs->icdpart[0];
128 /* sanity check: no ICD format if first partition invalid */
129 if (OK_id(pi->id)) {
130 strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
131 for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
132 /* accept only GEM,BGM,RAW,LNX,SWP partitions */
133 if (!((pi->flg & 1) && OK_id(pi->id)))
134 continue;
135 part_fmt = 2;
136 put_partition (state, slot,
137 be32_to_cpu(pi->st),
138 be32_to_cpu(pi->siz));
139 }
140 strlcat(state->pp_buf, " >", PAGE_SIZE);
141 }
142 }
143 #endif
144 put_dev_sector(sect);
145
146 strlcat(state->pp_buf, "\n", PAGE_SIZE);
147
148 return 1;
149 }
150