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 }