1 /* sun.c - Read SUN style partition tables. */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2002,2005,2006,2007 Free Software Foundation, Inc.
5 *
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include <grub/partition.h>
21 #include <grub/disk.h>
22 #include <grub/mm.h>
23 #include <grub/misc.h>
24 #include <grub/symbol.h>
25 #include <grub/types.h>
26 #include <grub/err.h>
27 #include <r_types.h>
28
29 #define GRUB_PARTMAP_SUN_MAGIC 0xDABE
30 #define GRUB_PARTMAP_SUN_MAX_PARTS 8
31 #define GRUB_PARTMAP_SUN_WHOLE_DISK_ID 0x05
32
33 R_PACKED (
34 struct grub_sun_partition_info
35 {
36 grub_uint8_t spare1;
37 grub_uint8_t id;
38 grub_uint8_t spare2;
39 grub_uint8_t flags;
40 });
41
42 R_PACKED (
43 struct grub_sun_partition_descriptor
44 {
45 grub_uint32_t start_cylinder;
46 grub_uint32_t num_sectors;
47 });
48
49 R_PACKED (
50 struct grub_sun_block
51 {
52 grub_uint8_t info[128]; /* Informative text string. */
53 grub_uint8_t spare0[14];
54 struct grub_sun_partition_info infos[8];
55 grub_uint8_t spare1[246]; /* Boot information etc. */
56 grub_uint16_t rspeed; /* Disk rotational speed. */
57 grub_uint16_t pcylcount; /* Physical cylinder count. */
58 grub_uint16_t sparecyl; /* extra sects per cylinder. */
59 grub_uint8_t spare2[4]; /* More magic... */
60 grub_uint16_t ilfact; /* Interleave factor. */
61 grub_uint16_t ncyl; /* Data cylinder count. */
62 grub_uint16_t nacyl; /* Alt. cylinder count. */
63 grub_uint16_t ntrks; /* Tracks per cylinder. */
64 grub_uint16_t nsect; /* Sectors per track. */
65 grub_uint8_t spare3[4]; /* Even more magic... */
66 struct grub_sun_partition_descriptor partitions[8];
67 grub_uint16_t magic; /* Magic number. */
68 grub_uint16_t csum; /* Label xor'd checksum. */
69 });
70
71 struct grub_partition_map grub_sun_partition_map;
72
73 /* Verify checksum (true=ok). */
74 static int
grub_sun_is_valid(struct grub_sun_block * label)75 grub_sun_is_valid (struct grub_sun_block *label)
76 {
77 grub_unaligned_uint16_t *pos;
78 grub_uint16_t sum = 0;
79
80 for (pos = (grub_uint16_t *) label;
81 pos < (grub_uint16_t *) (label + 1);
82 pos++)
83 sum ^= *pos;
84
85 return ! sum;
86 }
87
88 static grub_err_t
sun_partition_map_iterate(grub_disk_t disk,int (* hook)(grub_disk_t disk,const grub_partition_t partition,void * closure),void * closure)89 sun_partition_map_iterate (grub_disk_t disk,
90 int (*hook) (grub_disk_t disk,
91 const grub_partition_t partition,
92 void *closure),
93 void *closure)
94 {
95 grub_partition_t p;
96 struct grub_sun_block block;
97 int partnum;
98 grub_err_t err;
99
100 p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition));
101 if (! p)
102 return grub_errno;
103
104 p->partmap = &grub_sun_partition_map;
105 err = grub_disk_read (disk, 0, 0, sizeof (struct grub_sun_block),
106 &block);
107 if (err)
108 {
109 grub_free (p);
110 return err;
111 }
112
113 if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
114 {
115 grub_free (p);
116 return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
117 }
118
119 if (! grub_sun_is_valid (&block))
120 {
121 grub_free (p);
122 return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
123 }
124
125 /* Maybe another error value would be better, because partition
126 table _is_ recognized but invalid. */
127 for (partnum = 0; partnum < GRUB_PARTMAP_SUN_MAX_PARTS; partnum++)
128 {
129 struct grub_sun_partition_descriptor *desc;
130
131 if (block.infos[partnum].id == 0
132 || block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
133 continue;
134
135 desc = &block.partitions[partnum];
136 p->start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
137 * grub_be_to_cpu16 (block.ntrks)
138 * grub_be_to_cpu16 (block.nsect));
139 p->len = grub_be_to_cpu32 (desc->num_sectors);
140 p->number = p->index = partnum;
141 if (p->len)
142 {
143 if (hook (disk, p, closure))
144 partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
145 }
146 }
147
148 grub_free (p);
149
150 return grub_errno;
151 }
152
153 /* Partition map type. */
154 struct grub_partition_map grub_sun_partition_map =
155 {
156 .name = "sun",
157 .iterate = sun_partition_map_iterate,
158 };
159
160