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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
  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, &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
  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 }