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)30 int mac_partition(struct parsed_partitions *state)
31 {
32 Sector sect;
33 unsigned char *data;
34 int slot, blocks_in_map;
35 unsigned secsize;
36 #ifdef CONFIG_PPC_PMAC
37 int found_root = 0;
38 int found_root_goodness = 0;
39 #endif
40 struct mac_partition *part;
41 struct mac_driver_desc *md;
42
43 /* Get 0th block and look at the first partition map entry. */
44 md = read_part_sector(state, 0, §);
45 if (!md)
46 return -1;
47 if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
48 put_dev_sector(sect);
49 return 0;
50 }
51 secsize = be16_to_cpu(md->block_size);
52 put_dev_sector(sect);
53 data = read_part_sector(state, secsize/512, §);
54 if (!data)
55 return -1;
56 part = (struct mac_partition *) (data + secsize%512);
57 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
58 put_dev_sector(sect);
59 return 0; /* not a MacOS disk */
60 }
61 blocks_in_map = be32_to_cpu(part->map_count);
62 if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
63 put_dev_sector(sect);
64 return 0;
65 }
66 strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
67 for (slot = 1; slot <= blocks_in_map; ++slot) {
68 int pos = slot * secsize;
69 put_dev_sector(sect);
70 data = read_part_sector(state, pos/512, §);
71 if (!data)
72 return -1;
73 part = (struct mac_partition *) (data + pos%512);
74 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
75 break;
76 put_partition(state, slot,
77 be32_to_cpu(part->start_block) * (secsize/512),
78 be32_to_cpu(part->block_count) * (secsize/512));
79
80 if (!strnicmp(part->type, "Linux_RAID", 10))
81 state->parts[slot].flags = ADDPART_FLAG_RAID;
82 #ifdef CONFIG_PPC_PMAC
83 /*
84 * If this is the first bootable partition, tell the
85 * setup code, in case it wants to make this the root.
86 */
87 if (machine_is(powermac)) {
88 int goodness = 0;
89
90 mac_fix_string(part->processor, 16);
91 mac_fix_string(part->name, 32);
92 mac_fix_string(part->type, 32);
93
94 if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
95 && strcasecmp(part->processor, "powerpc") == 0)
96 goodness++;
97
98 if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
99 || (strnicmp(part->type, "Linux", 5) == 0
100 && strcasecmp(part->type, "Linux_swap") != 0)) {
101 int i, l;
102
103 goodness++;
104 l = strlen(part->name);
105 if (strcmp(part->name, "/") == 0)
106 goodness++;
107 for (i = 0; i <= l - 4; ++i) {
108 if (strnicmp(part->name + i, "root",
109 4) == 0) {
110 goodness += 2;
111 break;
112 }
113 }
114 if (strnicmp(part->name, "swap", 4) == 0)
115 goodness--;
116 }
117
118 if (goodness > found_root_goodness) {
119 found_root = slot;
120 found_root_goodness = goodness;
121 }
122 }
123 #endif /* CONFIG_PPC_PMAC */
124 }
125 #ifdef CONFIG_PPC_PMAC
126 if (found_root_goodness)
127 note_bootable_part(state->bdev->bd_dev, found_root,
128 found_root_goodness);
129 #endif
130
131 put_dev_sector(sect);
132 strlcat(state->pp_buf, "\n", PAGE_SIZE);
133 return 1;
134 }
135