mac.c

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/*
 *  fs/partitions/mac.c
 *
 *  Code extracted from drivers/block/genhd.c
 *  Copyright (C) 1991-1998  Linus Torvalds
 *  Re-organised Feb 1998 Russell King
 */

#include <linux/ctype.h>
#include "check.h"
#include "mac.h"

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
extern void note_bootable_part(dev_t dev, int part, int goodness);
#endif

/*
 * Code to understand MacOS partition tables.
 */

static inline void mac_fix_string(char *stg, int len)
{
    int i;

    for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
        stg[i] = 0;
}

int mac_partition(struct parsed_partitions *state)
{
    Sector sect;
    unsigned char *data;
    int slot, blocks_in_map;
    unsigned secsize;
#ifdef CONFIG_PPC_PMAC
    int found_root = 0;
    int found_root_goodness = 0;
#endif
    struct mac_partition *part;
    struct mac_driver_desc *md;

    /* Get 0th block and look at the first partition map entry. */
    md = read_part_sector(state, 0, &sect);
    if (!md)
        return -1;
    if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
        put_dev_sector(sect);
        return 0;
    }
    secsize = be16_to_cpu(md->block_size);
    put_dev_sector(sect);
    data = read_part_sector(state, secsize/512, &sect);
    if (!data)
        return -1;
    part = (struct mac_partition *) (data + secsize%512);
    if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
        put_dev_sector(sect);
        return 0;       /* not a MacOS disk */
    }
    blocks_in_map = be32_to_cpu(part->map_count);
    if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
        put_dev_sector(sect);
        return 0;
    }
    strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
    for (slot = 1; slot <= blocks_in_map; ++slot) {
        int pos = slot * secsize;
        put_dev_sector(sect);
        data = read_part_sector(state, pos/512, &sect);
        if (!data)
            return -1;
        part = (struct mac_partition *) (data + pos%512);
        if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
            break;
        put_partition(state, slot,
            be32_to_cpu(part->start_block) * (secsize/512),
            be32_to_cpu(part->block_count) * (secsize/512));

        if (!strnicmp(part->type, "Linux_RAID", 10))
            state->parts[slot].flags = ADDPART_FLAG_RAID;
#ifdef CONFIG_PPC_PMAC
        /*
         * If this is the first bootable partition, tell the
         * setup code, in case it wants to make this the root.
         */
        if (machine_is(powermac)) {
            int goodness = 0;

            mac_fix_string(part->processor, 16);
            mac_fix_string(part->name, 32);
            mac_fix_string(part->type, 32);                 
            
            if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
                && strcasecmp(part->processor, "powerpc") == 0)
                goodness++;

            if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
                || (strnicmp(part->type, "Linux", 5) == 0
                    && strcasecmp(part->type, "Linux_swap") != 0)) {
                int i, l;

                goodness++;
                l = strlen(part->name);
                if (strcmp(part->name, "/") == 0)
                    goodness++;
                for (i = 0; i <= l - 4; ++i) {
                    if (strnicmp(part->name + i, "root",
                             4) == 0) {
                        goodness += 2;
                        break;
                    }
                }
                if (strnicmp(part->name, "swap", 4) == 0)
                    goodness--;
            }

            if (goodness > found_root_goodness) {
                found_root = slot;
                found_root_goodness = goodness;
            }
        }
#endif /* CONFIG_PPC_PMAC */
    }
#ifdef CONFIG_PPC_PMAC
    if (found_root_goodness)
        note_bootable_part(state->bdev->bd_dev, found_root,
                   found_root_goodness);
#endif

    put_dev_sector(sect);
    strlcat(state->pp_buf, "\n", PAGE_SIZE);
    return 1;
}