1 /*
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/ctype.h>
10 #include "check.h"
11 #include "mac.h"
12
13 #ifdef CONFIG_PPC_PMAC
14 #include <asm/machdep.h>
15 extern void note_bootable_part(dev_t dev, int part, int goodness);
16 #endif
17
18 /*
19 * Code to understand MacOS partition tables.
20 */
21
mac_fix_string(char * stg,int len)22 static 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
mac_partition(struct parsed_partitions * state,struct block_device * bdev)30 int 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, §);
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, §);
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, §);
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 if (!strnicmp(part->type, "Linux_RAID", 10))
78 state->parts[slot].flags = 1;
79 #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 */
84 if (machine_is(powermac)) {
85 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 }
133