linux/block/partitions/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>
  15extern void note_bootable_part(dev_t dev, int part, int goodness);
  16#endif
  17
  18/*
  19 * Code to understand MacOS partition tables.
  20 */
  21
  22static 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
  30int 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, &sect);
  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, &sect);
  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
  67        if (blocks_in_map >= state->limit)
  68                blocks_in_map = state->limit - 1;
  69
  70        strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
  71        for (slot = 1; slot <= blocks_in_map; ++slot) {
  72                int pos = slot * secsize;
  73                put_dev_sector(sect);
  74                data = read_part_sector(state, pos/512, &sect);
  75                if (!data)
  76                        return -1;
  77                part = (struct mac_partition *) (data + pos%512);
  78                if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
  79                        break;
  80                put_partition(state, slot,
  81                        be32_to_cpu(part->start_block) * (secsize/512),
  82                        be32_to_cpu(part->block_count) * (secsize/512));
  83
  84                if (!strnicmp(part->type, "Linux_RAID", 10))
  85                        state->parts[slot].flags = ADDPART_FLAG_RAID;
  86#ifdef CONFIG_PPC_PMAC
  87                /*
  88                 * If this is the first bootable partition, tell the
  89                 * setup code, in case it wants to make this the root.
  90                 */
  91                if (machine_is(powermac)) {
  92                        int goodness = 0;
  93
  94                        mac_fix_string(part->processor, 16);
  95                        mac_fix_string(part->name, 32);
  96                        mac_fix_string(part->type, 32);                                 
  97                    
  98                        if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
  99                            && strcasecmp(part->processor, "powerpc") == 0)
 100                                goodness++;
 101
 102                        if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
 103                            || (strnicmp(part->type, "Linux", 5) == 0
 104                                && strcasecmp(part->type, "Linux_swap") != 0)) {
 105                                int i, l;
 106
 107                                goodness++;
 108                                l = strlen(part->name);
 109                                if (strcmp(part->name, "/") == 0)
 110                                        goodness++;
 111                                for (i = 0; i <= l - 4; ++i) {
 112                                        if (strnicmp(part->name + i, "root",
 113                                                     4) == 0) {
 114                                                goodness += 2;
 115                                                break;
 116                                        }
 117                                }
 118                                if (strnicmp(part->name, "swap", 4) == 0)
 119                                        goodness--;
 120                        }
 121
 122                        if (goodness > found_root_goodness) {
 123                                found_root = slot;
 124                                found_root_goodness = goodness;
 125                        }
 126                }
 127#endif /* CONFIG_PPC_PMAC */
 128        }
 129#ifdef CONFIG_PPC_PMAC
 130        if (found_root_goodness)
 131                note_bootable_part(state->bdev->bd_dev, found_root,
 132                                   found_root_goodness);
 133#endif
 134
 135        put_dev_sector(sect);
 136        strlcat(state->pp_buf, "\n", PAGE_SIZE);
 137        return 1;
 138}
 139
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