blob: bb22cdd0cb1433b8b05b8427ffb43c107f8f591e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/partitions/mac.c
3 *
4 * Code extracted from drivers/block/genhd.c
5 * Copyright (C) 1991-1998 Linus Torvalds
6 * Re-organised Feb 1998 Russell King
7 */
8
9#include <linux/config.h>
10#include <linux/ctype.h>
11#include "check.h"
12#include "mac.h"
13
14#ifdef CONFIG_PPC_PMAC
15extern void note_bootable_part(dev_t dev, int part, int goodness);
16#endif
17
18/*
19 * Code to understand MacOS partition tables.
20 */
21
22static inline void mac_fix_string(char *stg, int len)
23{
24 int i;
25
26 for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
27 stg[i] = 0;
28}
29
30int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
31{
32 int slot = 1;
33 Sector sect;
34 unsigned char *data;
35 int blk, blocks_in_map;
36 unsigned secsize;
37#ifdef CONFIG_PPC_PMAC
38 int found_root = 0;
39 int found_root_goodness = 0;
40#endif
41 struct mac_partition *part;
42 struct mac_driver_desc *md;
43
44 /* Get 0th block and look at the first partition map entry. */
45 md = (struct mac_driver_desc *) read_dev_sector(bdev, 0, &sect);
46 if (!md)
47 return -1;
48 if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
49 put_dev_sector(sect);
50 return 0;
51 }
52 secsize = be16_to_cpu(md->block_size);
53 put_dev_sector(sect);
54 data = read_dev_sector(bdev, secsize/512, &sect);
55 if (!data)
56 return -1;
57 part = (struct mac_partition *) (data + secsize%512);
58 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
59 put_dev_sector(sect);
60 return 0; /* not a MacOS disk */
61 }
62 printk(" [mac]");
63 blocks_in_map = be32_to_cpu(part->map_count);
64 for (blk = 1; blk <= blocks_in_map; ++blk) {
65 int pos = blk * secsize;
66 put_dev_sector(sect);
67 data = read_dev_sector(bdev, pos/512, &sect);
68 if (!data)
69 return -1;
70 part = (struct mac_partition *) (data + pos%512);
71 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
72 break;
73 put_partition(state, slot,
74 be32_to_cpu(part->start_block) * (secsize/512),
75 be32_to_cpu(part->block_count) * (secsize/512));
76
77#ifdef CONFIG_PPC_PMAC
78 /*
79 * If this is the first bootable partition, tell the
80 * setup code, in case it wants to make this the root.
81 */
82 if (_machine == _MACH_Pmac) {
83 int goodness = 0;
84
85 mac_fix_string(part->processor, 16);
86 mac_fix_string(part->name, 32);
87 mac_fix_string(part->type, 32);
88
89 if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
90 && strcasecmp(part->processor, "powerpc") == 0)
91 goodness++;
92
93 if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
94 || (strnicmp(part->type, "Linux", 5) == 0
95 && strcasecmp(part->type, "Linux_swap") != 0)) {
96 int i, l;
97
98 goodness++;
99 l = strlen(part->name);
100 if (strcmp(part->name, "/") == 0)
101 goodness++;
102 for (i = 0; i <= l - 4; ++i) {
103 if (strnicmp(part->name + i, "root",
104 4) == 0) {
105 goodness += 2;
106 break;
107 }
108 }
109 if (strnicmp(part->name, "swap", 4) == 0)
110 goodness--;
111 }
112
113 if (goodness > found_root_goodness) {
114 found_root = blk;
115 found_root_goodness = goodness;
116 }
117 }
118#endif /* CONFIG_PPC_PMAC */
119
120 ++slot;
121 }
122#ifdef CONFIG_PPC_PMAC
123 if (found_root_goodness)
124 note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
125#endif
126
127 put_dev_sector(sect);
128 printk("\n");
129 return 1;
130}