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// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
#ifdef CONFIG_PPC_PMAC
static inline void mac_fix_string(char *stg, int len)
{
int i;
for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
stg[i] = 0;
}
#endif
int mac_partition(struct parsed_partitions *state)
{
Sector sect;
unsigned char *data;
int slot, blocks_in_map;
unsigned secsize, datasize, partoffset;
#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, §);
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);
/*
* If the "block size" is not a power of 2, things get weird - we might
* end up with a partition straddling a sector boundary, so we wouldn't
* be able to read a partition entry with read_part_sector().
* Real block sizes are probably (?) powers of two, so just require
* that.
*/
if (!is_power_of_2(secsize))
return -1;
datasize = round_down(secsize, 512);
data = read_part_sector(state, datasize / 512, §);
if (!data)
return -1;
partoffset = secsize % 512;
if (partoffset + sizeof(*part) > datasize) {
put_dev_sector(sect);
return -1;
}
part = (struct mac_partition *) (data + partoffset);
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;
}
if (blocks_in_map >= state->limit)
blocks_in_map = state->limit - 1;
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, §);
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 (!strncasecmp(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
|| (strncasecmp(part->type, "Linux", 5) == 0
&& strcasecmp(part->type, "Linux_swap") != 0)) {
int i, l;
goodness++;
l = strnlen(part->name, sizeof(part->name));
if (strncmp(part->name, "/", sizeof(part->name)) == 0)
goodness++;
for (i = 0; i <= l - 4; ++i) {
if (strncasecmp(part->name + i, "root",
4) == 0) {
goodness += 2;
break;
}
}
if (strncasecmp(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->disk->part0->bd_dev, found_root,
found_root_goodness);
#endif
put_dev_sector(sect);
strlcat(state->pp_buf, "\n", PAGE_SIZE);
return 1;
}
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