[PATCH] powerpc: Kill _machine and hard-coded platform numbers
[linux-2.6.git] / fs / partitions / mac.c
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/config.h>
10 #include <linux/ctype.h>
11 #include "check.h"
12 #include "mac.h"
13
14 #ifdef CONFIG_PPC_PMAC
15 #include <asm/machdep.h>
16 extern void note_bootable_part(dev_t dev, int part, int goodness);
17 #endif
18
19 /*
20  * Code to understand MacOS partition tables.
21  */
22
23 static inline void mac_fix_string(char *stg, int len)
24 {
25         int i;
26
27         for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
28                 stg[i] = 0;
29 }
30
31 int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
32 {
33         int slot = 1;
34         Sector sect;
35         unsigned char *data;
36         int blk, blocks_in_map;
37         unsigned secsize;
38 #ifdef CONFIG_PPC_PMAC
39         int found_root = 0;
40         int found_root_goodness = 0;
41 #endif
42         struct mac_partition *part;
43         struct mac_driver_desc *md;
44
45         /* Get 0th block and look at the first partition map entry. */
46         md = (struct mac_driver_desc *) read_dev_sector(bdev, 0, &sect);
47         if (!md)
48                 return -1;
49         if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
50                 put_dev_sector(sect);
51                 return 0;
52         }
53         secsize = be16_to_cpu(md->block_size);
54         put_dev_sector(sect);
55         data = read_dev_sector(bdev, secsize/512, &sect);
56         if (!data)
57                 return -1;
58         part = (struct mac_partition *) (data + secsize%512);
59         if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
60                 put_dev_sector(sect);
61                 return 0;               /* not a MacOS disk */
62         }
63         printk(" [mac]");
64         blocks_in_map = be32_to_cpu(part->map_count);
65         for (blk = 1; blk <= blocks_in_map; ++blk) {
66                 int pos = blk * secsize;
67                 put_dev_sector(sect);
68                 data = read_dev_sector(bdev, pos/512, &sect);
69                 if (!data)
70                         return -1;
71                 part = (struct mac_partition *) (data + pos%512);
72                 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
73                         break;
74                 put_partition(state, slot,
75                         be32_to_cpu(part->start_block) * (secsize/512),
76                         be32_to_cpu(part->block_count) * (secsize/512));
77
78 #ifdef CONFIG_PPC_PMAC
79                 /*
80                  * If this is the first bootable partition, tell the
81                  * setup code, in case it wants to make this the root.
82                  */
83                 if (machine_is(powermac)) {
84                         int goodness = 0;
85
86                         mac_fix_string(part->processor, 16);
87                         mac_fix_string(part->name, 32);
88                         mac_fix_string(part->type, 32);                                 
89                     
90                         if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
91                             && strcasecmp(part->processor, "powerpc") == 0)
92                                 goodness++;
93
94                         if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
95                             || (strnicmp(part->type, "Linux", 5) == 0
96                                 && strcasecmp(part->type, "Linux_swap") != 0)) {
97                                 int i, l;
98
99                                 goodness++;
100                                 l = strlen(part->name);
101                                 if (strcmp(part->name, "/") == 0)
102                                         goodness++;
103                                 for (i = 0; i <= l - 4; ++i) {
104                                         if (strnicmp(part->name + i, "root",
105                                                      4) == 0) {
106                                                 goodness += 2;
107                                                 break;
108                                         }
109                                 }
110                                 if (strnicmp(part->name, "swap", 4) == 0)
111                                         goodness--;
112                         }
113
114                         if (goodness > found_root_goodness) {
115                                 found_root = blk;
116                                 found_root_goodness = goodness;
117                         }
118                 }
119 #endif /* CONFIG_PPC_PMAC */
120
121                 ++slot;
122         }
123 #ifdef CONFIG_PPC_PMAC
124         if (found_root_goodness)
125                 note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
126 #endif
127
128         put_dev_sector(sect);
129         printk("\n");
130         return 1;
131 }