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mac.c
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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 
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 
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, &sect);
45  if (!md)
46  return -1;
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, &sect);
54  if (!data)
55  return -1;
56  part = (struct mac_partition *) (data + secsize%512);
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, &sect);
71  if (!data)
72  return -1;
73  part = (struct mac_partition *) (data + pos%512);
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 
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 }