Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / block / 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/ctype.h>
10 #include "check.h"
11 #include "mac.h"
12
13 #ifdef CONFIG_PPC_PMAC
14 #include <asm/machdep.h>
15 extern void note_bootable_part(dev_t dev, int part, int goodness);
16 #endif
17
18 /*
19  * Code to understand MacOS partition tables.
20  */
21
22 static 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
30 int 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 }