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 (!strncasecmp(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			    || (strncasecmp(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 (strncasecmp(part->name + i, "root",
113						     4) == 0) {
114						goodness += 2;
115						break;
116					}
117				}
118				if (strncasecmp(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