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3f1578fe | 1 | /* amiga.c - Read amiga partition tables (RDB). */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
6d099807 | 4 | * Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. |
3f1578fe | 5 | * |
6 | * This program 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 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program 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 this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <grub/disk.h> | |
22 | #include <grub/misc.h> | |
23 | #include <grub/mm.h> | |
24 | #include <grub/partition.h> | |
25 | #include <grub/dl.h> | |
26 | ||
27 | struct grub_amiga_rdsk | |
28 | { | |
29 | /* "RDSK". */ | |
30 | grub_uint8_t magic[4]; | |
31 | grub_uint32_t size; | |
32 | grub_int32_t checksum; | |
33 | grub_uint32_t scsihost; | |
34 | grub_uint32_t blksz; | |
35 | grub_uint32_t flags; | |
36 | grub_uint32_t badblcklst; | |
37 | grub_uint32_t partitionlst; | |
38 | grub_uint32_t fslst; | |
39 | ||
40 | /* The other information is not important for us. */ | |
41 | } __attribute__ ((packed)); | |
42 | ||
43 | struct grub_amiga_partition | |
44 | { | |
45 | /* "PART". */ | |
46 | grub_uint8_t magic[4]; | |
47 | grub_int32_t size; | |
48 | grub_int32_t checksum; | |
49 | grub_uint32_t scsihost; | |
50 | grub_uint32_t next; | |
51 | grub_uint32_t flags; | |
52 | grub_uint32_t unused1[2]; | |
53 | grub_uint32_t devflags; | |
54 | grub_uint8_t namelen; | |
55 | grub_uint8_t name[31]; | |
56 | grub_uint32_t unused2[15]; | |
57 | ||
58 | grub_uint32_t unused3[3]; | |
59 | grub_uint32_t heads; | |
60 | grub_uint32_t unused4; | |
61 | grub_uint32_t block_per_track; | |
62 | grub_uint32_t unused5[3]; | |
63 | grub_uint32_t lowcyl; | |
64 | grub_uint32_t highcyl; | |
65 | ||
66 | grub_uint32_t firstcyl; | |
67 | } __attribute__ ((packed)); | |
68 | ||
69 | static struct grub_partition_map grub_amiga_partition_map; | |
70 | ||
71 | #ifndef GRUB_UTIL | |
72 | static grub_dl_t my_mod; | |
73 | #endif | |
992ffbbe | 74 | |
3f1578fe | 75 | \f |
992ffbbe | 76 | |
3f1578fe | 77 | static grub_err_t |
78 | amiga_partition_map_iterate (grub_disk_t disk, | |
992ffbbe | 79 | int (*hook) (grub_disk_t disk, |
80 | const grub_partition_t partition)) | |
3f1578fe | 81 | { |
82 | struct grub_partition part; | |
83 | struct grub_amiga_rdsk rdsk; | |
84 | struct grub_disk raw; | |
85 | int partno = 0; | |
86 | int next = -1; | |
87 | int pos; | |
88 | ||
89 | /* Enforce raw disk access. */ | |
90 | raw = *disk; | |
91 | raw.partition = 0; | |
92 | ||
93 | /* The RDSK block is one of the first 15 blocks. */ | |
94 | for (pos = 0; pos < 15; pos++) | |
95 | { | |
96 | /* Read the RDSK block which is a descriptor for the entire disk. */ | |
97 | if (grub_disk_read (&raw, pos, 0, | |
98 | sizeof (rdsk), (char *) &rdsk)) | |
99 | return grub_errno; | |
100 | ||
101 | if (!grub_strcmp (rdsk.magic, "RDSK")) | |
102 | { | |
103 | /* Found the first PART block. */ | |
104 | next = grub_be_to_cpu32 (rdsk.partitionlst); | |
105 | break; | |
106 | } | |
107 | } | |
1b14a681 | 108 | |
109 | if (next == -1) | |
110 | return grub_error (GRUB_ERR_BAD_PART_TABLE, | |
111 | "Amiga partition map not found."); | |
3f1578fe | 112 | |
113 | /* The end of the partition list is marked using "-1". */ | |
114 | while (next != -1) | |
115 | { | |
116 | struct grub_amiga_partition apart; | |
117 | ||
118 | /* Read the RDSK block which is a descriptor for the entire disk. */ | |
119 | if (grub_disk_read (&raw, next, 0, | |
120 | sizeof (apart), (char *) &apart)) | |
121 | return grub_errno; | |
122 | ||
123 | /* Calculate the first block and the size of the partition. */ | |
124 | part.start = (grub_be_to_cpu32 (apart.lowcyl) | |
125 | * grub_be_to_cpu32 (apart.heads) | |
126 | * grub_be_to_cpu32 (apart.block_per_track)); | |
127 | part.len = ((grub_be_to_cpu32 (apart.highcyl) | |
128 | - grub_be_to_cpu32 (apart.lowcyl) + 1) | |
129 | * grub_be_to_cpu32 (apart.heads) | |
130 | * grub_be_to_cpu32 (apart.block_per_track)); | |
131 | ||
132 | part.offset = next * 512; | |
133 | part.index = partno; | |
134 | part.partmap = &grub_amiga_partition_map; | |
135 | ||
992ffbbe | 136 | if (hook (disk, &part)) |
3f1578fe | 137 | return grub_errno; |
138 | ||
139 | next = grub_be_to_cpu32 (apart.next); | |
140 | partno++; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | ||
147 | static grub_partition_t | |
148 | amiga_partition_map_probe (grub_disk_t disk, const char *str) | |
149 | { | |
150 | grub_partition_t p = 0; | |
151 | int partnum = 0; | |
152 | char *s = (char *) str; | |
153 | ||
992ffbbe | 154 | auto int find_func (grub_disk_t d, const grub_partition_t partition); |
3f1578fe | 155 | |
992ffbbe | 156 | int find_func (grub_disk_t d __attribute__ ((unused)), |
157 | const grub_partition_t partition) | |
3f1578fe | 158 | { |
159 | if (partnum == partition->index) | |
160 | { | |
161 | p = (grub_partition_t) grub_malloc (sizeof (*p)); | |
162 | if (! p) | |
163 | return 1; | |
164 | ||
165 | grub_memcpy (p, partition, sizeof (*p)); | |
166 | return 1; | |
167 | } | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | /* Get the partition number. */ | |
173 | partnum = grub_strtoul (s, 0, 10); | |
174 | if (grub_errno) | |
175 | { | |
176 | grub_error (GRUB_ERR_BAD_FILENAME, "invalid partition"); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | if (amiga_partition_map_iterate (disk, find_func)) | |
181 | goto fail; | |
182 | ||
183 | return p; | |
184 | ||
185 | fail: | |
186 | grub_free (p); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | ||
191 | static char * | |
192 | amiga_partition_map_get_name (const grub_partition_t p) | |
193 | { | |
194 | char *name; | |
195 | ||
196 | name = grub_malloc (13); | |
197 | if (! name) | |
198 | return 0; | |
199 | ||
200 | grub_sprintf (name, "%d", p->index); | |
201 | return name; | |
202 | } | |
203 | ||
204 | \f | |
205 | /* Partition map type. */ | |
206 | static struct grub_partition_map grub_amiga_partition_map = | |
207 | { | |
208 | .name = "amiga_partition_map", | |
209 | .iterate = amiga_partition_map_iterate, | |
210 | .probe = amiga_partition_map_probe, | |
211 | .get_name = amiga_partition_map_get_name | |
212 | }; | |
213 | ||
6d099807 | 214 | GRUB_MOD_INIT(amiga_partition_map) |
3f1578fe | 215 | { |
216 | grub_partition_map_register (&grub_amiga_partition_map); | |
6d099807 | 217 | #ifndef GRUB_UTIL |
3f1578fe | 218 | my_mod = mod; |
6d099807 | 219 | #endif |
3f1578fe | 220 | } |
221 | ||
6d099807 | 222 | GRUB_MOD_FINI(amiga_partition_map) |
3f1578fe | 223 | { |
224 | grub_partition_map_unregister (&grub_amiga_partition_map); | |
225 | } |