blob: d4a0fad3563b4bbee00e2155e3210e2b01f0021c [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
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/ctype.h>
10#include "check.h"
11#include "mac.h"
12
13#ifdef CONFIG_PPC_PMAC
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +110014#include <asm/machdep.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015extern 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
David Woodhousea79f43a2006-12-04 15:45:46 +000077 if (!strnicmp(part->type, "Linux_RAID", 10))
78 state->parts[slot].flags = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#ifdef CONFIG_PPC_PMAC
80 /*
81 * If this is the first bootable partition, tell the
82 * setup code, in case it wants to make this the root.
83 */
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +110084 if (machine_is(powermac)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 int goodness = 0;
86
87 mac_fix_string(part->processor, 16);
88 mac_fix_string(part->name, 32);
89 mac_fix_string(part->type, 32);
90
91 if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
92 && strcasecmp(part->processor, "powerpc") == 0)
93 goodness++;
94
95 if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
96 || (strnicmp(part->type, "Linux", 5) == 0
97 && strcasecmp(part->type, "Linux_swap") != 0)) {
98 int i, l;
99
100 goodness++;
101 l = strlen(part->name);
102 if (strcmp(part->name, "/") == 0)
103 goodness++;
104 for (i = 0; i <= l - 4; ++i) {
105 if (strnicmp(part->name + i, "root",
106 4) == 0) {
107 goodness += 2;
108 break;
109 }
110 }
111 if (strnicmp(part->name, "swap", 4) == 0)
112 goodness--;
113 }
114
115 if (goodness > found_root_goodness) {
116 found_root = blk;
117 found_root_goodness = goodness;
118 }
119 }
120#endif /* CONFIG_PPC_PMAC */
121
122 ++slot;
123 }
124#ifdef CONFIG_PPC_PMAC
125 if (found_root_goodness)
126 note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
127#endif
128
129 put_dev_sector(sect);
130 printk("\n");
131 return 1;
132}