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c906108c SS |
1 | /* This file is part of the program psim. |
2 | ||
3 | Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
3fd725ef | 7 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
8 | (at your option) any later version. |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
51b318de | 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
c906108c SS |
17 | |
18 | */ | |
19 | ||
20 | ||
21 | #ifndef _PK_DISKLABEL_C_ | |
22 | #define _PK_DISKLABEL_C_ | |
23 | ||
24 | #ifndef STATIC_INLINE_PK_DISKLABEL | |
25 | #define STATIC_INLINE_PK_DISKLABEL STATIC_INLINE | |
26 | #endif | |
27 | ||
28 | #include "device_table.h" | |
29 | ||
30 | #include "pk.h" | |
31 | ||
32 | #ifdef HAVE_STDLIB_H | |
33 | #include <stdlib.h> | |
34 | #endif | |
35 | ||
36 | ||
37 | ||
38 | /* PACKAGE | |
39 | ||
40 | disk-label - all knowing disk I/O package | |
41 | ||
42 | DESCRIPTION | |
43 | ||
44 | The disk-label package provides a generic interface to disk | |
45 | devices. It uses the arguments specified when an instance is being | |
46 | created to determine if the raw disk, a partition, or a file within | |
47 | a partition should be opened. | |
48 | ||
49 | An instance create call to disk-label could result, for instance, | |
50 | in the opening of a DOS file system contained within a dos | |
51 | partition contained within a physical disk. | |
52 | ||
53 | */ | |
54 | ||
55 | /* taken from bfd/ppcboot.c by Michael Meissner */ | |
56 | ||
57 | /* PPCbug location structure */ | |
58 | typedef struct ppcboot_location { | |
59 | unsigned8 ind; | |
60 | unsigned8 head; | |
61 | unsigned8 sector; | |
62 | unsigned8 cylinder; | |
63 | } ppcboot_location_t; | |
64 | ||
65 | /* PPCbug partition table layout */ | |
66 | typedef struct ppcboot_partition { | |
67 | ppcboot_location_t partition_begin; /* partition begin */ | |
68 | ppcboot_location_t partition_end; /* partition end */ | |
69 | unsigned8 sector_begin[4]; /* 32-bit start RBA (zero-based), little endian */ | |
70 | unsigned8 sector_length[4]; /* 32-bit RBA count (one-based), little endian */ | |
71 | } ppcboot_partition_t; | |
72 | ||
73 | #if 0 | |
74 | /* PPCbug boot layout. */ | |
75 | typedef struct ppcboot_hdr { | |
76 | unsigned8 pc_compatibility[446]; /* x86 instruction field */ | |
77 | ppcboot_partition_t partition[4]; /* partition information */ | |
78 | unsigned8 signature[2]; /* 0x55 and 0xaa */ | |
79 | unsigned8 entry_offset[4]; /* entry point offset, little endian */ | |
80 | unsigned8 length[4]; /* load image length, little endian */ | |
81 | unsigned8 flags; /* flag field */ | |
82 | unsigned8 os_id; /* OS_ID */ | |
83 | char partition_name[32]; /* partition name */ | |
84 | unsigned8 reserved1[470]; /* reserved */ | |
85 | } ppcboot_hdr_t; | |
86 | #endif | |
87 | ||
88 | ||
89 | typedef struct _disklabel { | |
90 | device_instance *parent; | |
91 | device_instance *raw_disk; | |
92 | unsigned_word pos; | |
93 | unsigned_word sector_begin; | |
94 | unsigned_word sector_length; | |
95 | } disklabel; | |
96 | ||
97 | ||
98 | static unsigned_word | |
99 | sector2uw(unsigned8 s[4]) | |
100 | { | |
101 | return ((s[3] << 24) | |
102 | + (s[2] << 16) | |
103 | + (s[1] << 8) | |
104 | + (s[0] << 0)); | |
105 | } | |
106 | ||
107 | ||
108 | static void | |
109 | disklabel_delete(device_instance *instance) | |
110 | { | |
111 | disklabel *label = device_instance_data(instance); | |
112 | device_instance_delete(label->raw_disk); | |
d79fe0d6 | 113 | free(label); |
c906108c SS |
114 | } |
115 | ||
116 | ||
117 | static int | |
118 | disklabel_read(device_instance *instance, | |
119 | void *buf, | |
120 | unsigned_word len) | |
121 | { | |
122 | disklabel *label = device_instance_data(instance); | |
123 | int nr_read; | |
124 | if (label->pos + len > label->sector_length) | |
125 | len = label->sector_length - label->pos; | |
126 | if (device_instance_seek(label->raw_disk, 0, | |
127 | label->sector_begin + label->pos) < 0) | |
128 | return -1; | |
129 | nr_read = device_instance_read(label->raw_disk, buf, len); | |
130 | if (nr_read > 0) | |
131 | label->pos += nr_read; | |
132 | return nr_read; | |
133 | } | |
134 | ||
135 | static int | |
136 | disklabel_write(device_instance *instance, | |
137 | const void *buf, | |
138 | unsigned_word len) | |
139 | { | |
140 | disklabel *label = device_instance_data(instance); | |
141 | int nr_written; | |
142 | if (label->pos + len > label->sector_length) | |
143 | len = label->sector_length - label->pos; | |
144 | if (device_instance_seek(label->raw_disk, 0, | |
145 | label->sector_begin + label->pos) < 0) | |
146 | return -1; | |
147 | nr_written = device_instance_write(label->raw_disk, buf, len); | |
148 | if (nr_written > 0) | |
149 | label->pos += nr_written; | |
150 | return nr_written; | |
151 | } | |
152 | ||
153 | static int | |
154 | disklabel_seek(device_instance *instance, | |
155 | unsigned_word pos_hi, | |
156 | unsigned_word pos_lo) | |
157 | { | |
158 | disklabel *label = device_instance_data(instance); | |
159 | if (pos_lo >= label->sector_length || pos_hi != 0) | |
160 | return -1; | |
161 | label->pos = pos_lo; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | ||
166 | static const device_instance_callbacks package_disklabel_callbacks = { | |
167 | disklabel_delete, | |
168 | disklabel_read, | |
169 | disklabel_write, | |
170 | disklabel_seek, | |
171 | }; | |
172 | ||
173 | /* Reconize different types of boot block */ | |
174 | ||
175 | static int | |
176 | block0_is_bpb(const unsigned8 block[]) | |
177 | { | |
178 | const char ebdic_ibma[] = { 0xc9, 0xc2, 0xd4, 0xc1 }; | |
179 | /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */ | |
180 | /* can't start with IBMA */ | |
181 | if (memcmp(block, ebdic_ibma, sizeof(ebdic_ibma)) == 0) | |
182 | return 0; | |
183 | /* must have LE 0xAA55 signature at offset 510 */ | |
184 | if (block[511] != 0xAA && block[510] != 0x55) | |
185 | return 0; | |
186 | /* valid 16 bit LE bytes per sector - 256, 512, 1024 */ | |
187 | if (block[11] != 0 | |
188 | || (block[12] != 1 && block[12] != 2 && block[12] != 4)) | |
189 | return 0; | |
190 | /* nr fats is 1 or 2 */ | |
191 | if (block[16] != 1 && block[16] != 2) | |
192 | return 0; | |
193 | return 1; | |
194 | } | |
195 | ||
196 | ||
197 | /* Verify that the device contains an ISO-9660 File system */ | |
198 | ||
199 | static int | |
200 | is_iso9660(device_instance *raw_disk) | |
201 | { | |
202 | /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */ | |
203 | unsigned8 block[512]; | |
204 | if (device_instance_seek(raw_disk, 0, 512 * 64) < 0) | |
205 | return 0; | |
206 | if (device_instance_read(raw_disk, block, sizeof(block)) != sizeof(block)) | |
207 | return 0; | |
208 | if (block[0] == 0x01 | |
209 | && block[1] == 'C' | |
210 | && block[2] == 'D' | |
211 | && block[3] == '0' | |
212 | && block[4] == '0' | |
213 | && block[5] == '1') | |
214 | return 1; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | ||
219 | /* Verify that the disk block contains a valid DOS partition table. | |
220 | While we're at it have a look around for active partitions etc. | |
221 | ||
222 | Return 0: invalid | |
223 | Return 1..4: valid, value returned is the first active partition | |
224 | Return -1: no active partition */ | |
225 | ||
226 | static int | |
227 | block0_is_fdisk(const unsigned8 block[]) | |
228 | { | |
229 | const int partition_type_fields[] = { 0, 0x1c2, 0x1d2, 0x1e2, 0x1f2 }; | |
230 | const int partition_active_fields[] = { 0, 0x1be, 0x1ce, 0x1de, 0xee }; | |
231 | int partition; | |
232 | int active = -1; | |
233 | /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */ | |
234 | /* must have LE 0xAA55 signature at offset 510 */ | |
235 | if (block[511/*0x1ff*/] != 0xAA && block[510/*0x1fe*/] != 0x55) | |
236 | return 0; | |
237 | /* must contain valid partition types */ | |
238 | for (partition = 1; partition <= 4 && active != 0; partition++) { | |
239 | int partition_type = block[partition_type_fields[partition]]; | |
240 | int is_active = block[partition_active_fields[partition]] == 0x80; | |
241 | const char *type; | |
242 | switch (partition_type) { | |
243 | case 0x00: | |
244 | type = "UNUSED"; | |
245 | break; | |
246 | case 0x01: | |
247 | type = "FAT 12 File system"; | |
248 | break; | |
249 | case 0x04: | |
250 | type = "FAT 16 File system"; | |
251 | break; | |
252 | case 0x05: | |
253 | case 0x06: | |
254 | type = "rejected - extended/chained partition not supported"; | |
255 | active = 0; | |
256 | break; | |
257 | case 0x41: | |
258 | type = "Single program image"; | |
259 | break; | |
260 | case 0x82: | |
261 | type = "Solaris?"; | |
262 | break; | |
263 | case 0x96: | |
264 | type = "ISO 9660 File system"; | |
265 | break; | |
266 | default: | |
267 | type = "rejected - unknown type"; | |
268 | active = 0; | |
269 | break; | |
270 | } | |
271 | PTRACE(disklabel, ("partition %d of type 0x%02x - %s%s\n", | |
272 | partition, | |
273 | partition_type, | |
274 | type, | |
275 | is_active && active != 0 ? " (active)" : "")); | |
276 | if (partition_type != 0 && is_active && active < 0) | |
277 | active = partition; | |
278 | } | |
279 | return active; | |
280 | } | |
281 | ||
282 | ||
283 | /* Verify that block0 corresponds to a MAC disk */ | |
284 | ||
285 | static int | |
286 | block0_is_mac_disk(const unsigned8 block[]) | |
287 | { | |
288 | /* ref PowerPC Microprocessor CHRP bindings 1.2b - page 47 */ | |
289 | /* signature - BEx4552 at offset 0 */ | |
290 | if (block[0] != 0x45 || block[1] != 0x52) | |
291 | return 0; | |
292 | return 1; | |
293 | } | |
294 | ||
295 | ||
296 | /* Open a logical disk/file */ | |
297 | ||
298 | device_instance * | |
299 | pk_disklabel_create_instance(device_instance *raw_disk, | |
300 | const char *args) | |
301 | { | |
302 | int partition; | |
303 | char *filename; | |
304 | ||
305 | /* parse the arguments */ | |
306 | if (args == NULL) { | |
307 | partition = 0; | |
308 | filename = NULL; | |
309 | } | |
310 | else { | |
311 | partition = strtoul((char*)args, &filename, 0); | |
312 | if (filename == args) | |
313 | partition = -1; /* not specified */ | |
314 | if (*filename == ',') | |
315 | filename++; | |
316 | if (*filename == '\0') | |
317 | filename = NULL; /* easier */ | |
318 | } | |
319 | ||
320 | if (partition == 0) { | |
321 | /* select the raw disk */ | |
322 | return raw_disk; | |
323 | } | |
324 | else { | |
325 | unsigned8 boot_block[512]; | |
326 | /* get the boot block for examination */ | |
327 | if (device_instance_seek(raw_disk, 0, 0) < 0) | |
328 | device_error(device_instance_device(raw_disk), | |
329 | "Problem seeking on raw disk"); | |
330 | if (device_instance_read(raw_disk, &boot_block, sizeof(boot_block)) | |
331 | != sizeof(boot_block)) | |
332 | device_error(device_instance_device(raw_disk), "Problem reading boot block"); | |
333 | ||
334 | if (partition < 0) { | |
335 | /* select the active partition */ | |
336 | if (block0_is_bpb(boot_block)) { | |
337 | device_error(device_instance_device(raw_disk), "Unimplemented active BPB"); | |
338 | } | |
339 | else if (block0_is_fdisk(boot_block)) { | |
340 | int active = block0_is_fdisk(boot_block); | |
341 | device_error(device_instance_device(raw_disk), "Unimplemented active FDISK (%d)", | |
342 | active); | |
343 | } | |
344 | else if (is_iso9660(raw_disk)) { | |
345 | device_error(device_instance_device(raw_disk), "Unimplemented active ISO9660"); | |
346 | } | |
347 | else if (block0_is_mac_disk(boot_block)) { | |
348 | device_error(device_instance_device(raw_disk), "Unimplemented active MAC DISK"); | |
349 | } | |
350 | else { | |
351 | device_error(device_instance_device(raw_disk), "Unreconized bootblock"); | |
352 | } | |
353 | } | |
354 | else { | |
355 | /* select the specified disk partition */ | |
356 | if (block0_is_bpb(boot_block)) { | |
357 | device_error(device_instance_device(raw_disk), "Unimplemented BPB"); | |
358 | } | |
359 | else if (block0_is_fdisk(boot_block)) { | |
360 | /* return an instance */ | |
361 | ppcboot_partition_t *partition_table = (ppcboot_partition_t*) &boot_block[446]; | |
362 | ppcboot_partition_t *partition_entry; | |
363 | disklabel *label; | |
364 | if (partition > 4) | |
365 | device_error(device_instance_device(raw_disk), | |
366 | "Only FDISK partitions 1..4 supported"); | |
367 | partition_entry = &partition_table[partition - 1]; | |
368 | label = ZALLOC(disklabel); | |
369 | label->raw_disk = raw_disk; | |
370 | label->pos = 0; | |
371 | label->sector_begin = 512 * sector2uw(partition_entry->sector_begin); | |
372 | label->sector_length = 512 * sector2uw(partition_entry->sector_length); | |
373 | PTRACE(disklabel, ("partition %ld, sector-begin %ld, length %ld\n", | |
374 | (long)partition, | |
375 | (long)label->sector_begin, | |
376 | (long)label->sector_length)); | |
377 | if (filename != NULL) | |
378 | device_error(device_instance_device(raw_disk), | |
379 | "FDISK file names not yet supported"); | |
380 | return device_create_instance_from(NULL, raw_disk, | |
381 | label, | |
382 | NULL, args, | |
383 | &package_disklabel_callbacks); | |
384 | } | |
385 | else if (block0_is_mac_disk(boot_block)) { | |
386 | device_error(device_instance_device(raw_disk), "Unimplemented MAC DISK"); | |
387 | } | |
388 | else { | |
389 | device_error(device_instance_device(raw_disk), | |
390 | "Unreconized bootblock"); | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
398 | ||
399 | #endif /* _PK_DISKLABEL_C_ */ | |
400 |