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Commit | Line | Data |
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6a0f9e82 | 1 | /* |
cc2040f8 | 2 | * Block driver for Connectix / Microsoft Virtual PC images |
5fafdf24 | 3 | * |
6a0f9e82 | 4 | * Copyright (c) 2005 Alex Beregszaszi |
15d35bc5 | 5 | * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> |
5fafdf24 | 6 | * |
6a0f9e82 FB |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
faf07963 | 25 | #include "qemu-common.h" |
6a0f9e82 | 26 | #include "block_int.h" |
5efa9d5a | 27 | #include "module.h" |
6a0f9e82 FB |
28 | |
29 | /**************************************************************/ | |
30 | ||
31 | #define HEADER_SIZE 512 | |
32 | ||
33 | //#define CACHE | |
34 | ||
2cfacb62 AL |
35 | enum vhd_type { |
36 | VHD_FIXED = 2, | |
37 | VHD_DYNAMIC = 3, | |
38 | VHD_DIFFERENCING = 4, | |
39 | }; | |
40 | ||
57c7d9e5 AL |
41 | // Seconds since Jan 1, 2000 0:00:00 (UTC) |
42 | #define VHD_TIMESTAMP_BASE 946684800 | |
43 | ||
6a0f9e82 | 44 | // always big-endian |
b9fa33a6 | 45 | struct vhd_footer { |
2cfacb62 AL |
46 | char creator[8]; // "conectix" |
47 | uint32_t features; | |
48 | uint32_t version; | |
49 | ||
50 | // Offset of next header structure, 0xFFFFFFFF if none | |
51 | uint64_t data_offset; | |
52 | ||
53 | // Seconds since Jan 1, 2000 0:00:00 (UTC) | |
54 | uint32_t timestamp; | |
55 | ||
56 | char creator_app[4]; // "vpc " | |
57 | uint16_t major; | |
58 | uint16_t minor; | |
59 | char creator_os[4]; // "Wi2k" | |
60 | ||
61 | uint64_t orig_size; | |
62 | uint64_t size; | |
63 | ||
64 | uint16_t cyls; | |
65 | uint8_t heads; | |
66 | uint8_t secs_per_cyl; | |
67 | ||
68 | uint32_t type; | |
69 | ||
70 | // Checksum of the Hard Disk Footer ("one's complement of the sum of all | |
71 | // the bytes in the footer without the checksum field") | |
72 | uint32_t checksum; | |
73 | ||
74 | // UUID used to identify a parent hard disk (backing file) | |
75 | uint8_t uuid[16]; | |
76 | ||
77 | uint8_t in_saved_state; | |
b9fa33a6 AL |
78 | }; |
79 | ||
80 | struct vhd_dyndisk_header { | |
2cfacb62 AL |
81 | char magic[8]; // "cxsparse" |
82 | ||
83 | // Offset of next header structure, 0xFFFFFFFF if none | |
84 | uint64_t data_offset; | |
85 | ||
86 | // Offset of the Block Allocation Table (BAT) | |
87 | uint64_t table_offset; | |
88 | ||
89 | uint32_t version; | |
90 | uint32_t max_table_entries; // 32bit/entry | |
91 | ||
92 | // 2 MB by default, must be a power of two | |
93 | uint32_t block_size; | |
94 | ||
95 | uint32_t checksum; | |
96 | uint8_t parent_uuid[16]; | |
97 | uint32_t parent_timestamp; | |
98 | uint32_t reserved; | |
99 | ||
100 | // Backing file name (in UTF-16) | |
101 | uint8_t parent_name[512]; | |
102 | ||
103 | struct { | |
104 | uint32_t platform; | |
105 | uint32_t data_space; | |
106 | uint32_t data_length; | |
107 | uint32_t reserved; | |
108 | uint64_t data_offset; | |
109 | } parent_locator[8]; | |
6a0f9e82 FB |
110 | }; |
111 | ||
112 | typedef struct BDRVVPCState { | |
848c66e8 | 113 | CoMutex lock; |
15d35bc5 AL |
114 | uint8_t footer_buf[HEADER_SIZE]; |
115 | uint64_t free_data_block_offset; | |
2cfacb62 | 116 | int max_table_entries; |
6a0f9e82 | 117 | uint32_t *pagetable; |
15d35bc5 AL |
118 | uint64_t bat_offset; |
119 | uint64_t last_bitmap_offset; | |
6a0f9e82 | 120 | |
2cfacb62 | 121 | uint32_t block_size; |
15d35bc5 AL |
122 | uint32_t bitmap_size; |
123 | ||
6a0f9e82 FB |
124 | #ifdef CACHE |
125 | uint8_t *pageentry_u8; | |
126 | uint32_t *pageentry_u32; | |
127 | uint16_t *pageentry_u16; | |
3b46e624 | 128 | |
6a0f9e82 FB |
129 | uint64_t last_bitmap; |
130 | #endif | |
131 | } BDRVVPCState; | |
132 | ||
57c7d9e5 AL |
133 | static uint32_t vpc_checksum(uint8_t* buf, size_t size) |
134 | { | |
135 | uint32_t res = 0; | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < size; i++) | |
139 | res += buf[i]; | |
140 | ||
141 | return ~res; | |
142 | } | |
143 | ||
144 | ||
6a0f9e82 FB |
145 | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
146 | { | |
ffe8ab83 | 147 | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
6a0f9e82 | 148 | return 100; |
6a0f9e82 FB |
149 | return 0; |
150 | } | |
151 | ||
66f82cee | 152 | static int vpc_open(BlockDriverState *bs, int flags) |
6a0f9e82 FB |
153 | { |
154 | BDRVVPCState *s = bs->opaque; | |
66f82cee | 155 | int i; |
b9fa33a6 AL |
156 | struct vhd_footer* footer; |
157 | struct vhd_dyndisk_header* dyndisk_header; | |
158 | uint8_t buf[HEADER_SIZE]; | |
57c7d9e5 | 159 | uint32_t checksum; |
efc8243d | 160 | int err = -1; |
6a0f9e82 | 161 | |
66f82cee | 162 | if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE) |
6a0f9e82 FB |
163 | goto fail; |
164 | ||
15d35bc5 | 165 | footer = (struct vhd_footer*) s->footer_buf; |
b9fa33a6 | 166 | if (strncmp(footer->creator, "conectix", 8)) |
6a0f9e82 | 167 | goto fail; |
6a0f9e82 | 168 | |
57c7d9e5 AL |
169 | checksum = be32_to_cpu(footer->checksum); |
170 | footer->checksum = 0; | |
171 | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) | |
172 | fprintf(stderr, "block-vpc: The header checksum of '%s' is " | |
66f82cee | 173 | "incorrect.\n", bs->filename); |
57c7d9e5 | 174 | |
1fa79228 AL |
175 | // The visible size of a image in Virtual PC depends on the geometry |
176 | // rather than on the size stored in the footer (the size in the footer | |
177 | // is too large usually) | |
178 | bs->total_sectors = (int64_t) | |
179 | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; | |
180 | ||
efc8243d SH |
181 | if (bs->total_sectors >= 65535 * 16 * 255) { |
182 | err = -EFBIG; | |
183 | goto fail; | |
184 | } | |
185 | ||
66f82cee | 186 | if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, HEADER_SIZE) |
b71d1c2e | 187 | != HEADER_SIZE) |
6a0f9e82 FB |
188 | goto fail; |
189 | ||
b9fa33a6 AL |
190 | dyndisk_header = (struct vhd_dyndisk_header*) buf; |
191 | ||
192 | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) | |
193 | goto fail; | |
6a0f9e82 | 194 | |
6a0f9e82 | 195 | |
15d35bc5 AL |
196 | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
197 | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; | |
198 | ||
2cfacb62 | 199 | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
7267c094 | 200 | s->pagetable = g_malloc(s->max_table_entries * 4); |
b71d1c2e | 201 | |
15d35bc5 | 202 | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
66f82cee | 203 | if (bdrv_pread(bs->file, s->bat_offset, s->pagetable, |
15d35bc5 | 204 | s->max_table_entries * 4) != s->max_table_entries * 4) |
b71d1c2e AL |
205 | goto fail; |
206 | ||
15d35bc5 AL |
207 | s->free_data_block_offset = |
208 | (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; | |
209 | ||
210 | for (i = 0; i < s->max_table_entries; i++) { | |
211 | be32_to_cpus(&s->pagetable[i]); | |
212 | if (s->pagetable[i] != 0xFFFFFFFF) { | |
213 | int64_t next = (512 * (int64_t) s->pagetable[i]) + | |
214 | s->bitmap_size + s->block_size; | |
215 | ||
216 | if (next> s->free_data_block_offset) | |
217 | s->free_data_block_offset = next; | |
218 | } | |
219 | } | |
220 | ||
221 | s->last_bitmap_offset = (int64_t) -1; | |
6a0f9e82 | 222 | |
6a0f9e82 | 223 | #ifdef CACHE |
7267c094 | 224 | s->pageentry_u8 = g_malloc(512); |
6a0f9e82 FB |
225 | s->pageentry_u32 = s->pageentry_u8; |
226 | s->pageentry_u16 = s->pageentry_u8; | |
227 | s->last_pagetable = -1; | |
228 | #endif | |
229 | ||
848c66e8 | 230 | qemu_co_mutex_init(&s->lock); |
6a0f9e82 FB |
231 | return 0; |
232 | fail: | |
efc8243d | 233 | return err; |
6a0f9e82 FB |
234 | } |
235 | ||
b71d1c2e AL |
236 | /* |
237 | * Returns the absolute byte offset of the given sector in the image file. | |
238 | * If the sector is not allocated, -1 is returned instead. | |
15d35bc5 AL |
239 | * |
240 | * The parameter write must be 1 if the offset will be used for a write | |
241 | * operation (the block bitmaps is updated then), 0 otherwise. | |
b71d1c2e | 242 | */ |
15d35bc5 AL |
243 | static inline int64_t get_sector_offset(BlockDriverState *bs, |
244 | int64_t sector_num, int write) | |
6a0f9e82 FB |
245 | { |
246 | BDRVVPCState *s = bs->opaque; | |
247 | uint64_t offset = sector_num * 512; | |
248 | uint64_t bitmap_offset, block_offset; | |
249 | uint32_t pagetable_index, pageentry_index; | |
250 | ||
2cfacb62 AL |
251 | pagetable_index = offset / s->block_size; |
252 | pageentry_index = (offset % s->block_size) / 512; | |
3b46e624 | 253 | |
15d35bc5 AL |
254 | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
255 | return -1; // not allocated | |
6a0f9e82 | 256 | |
378e2aea | 257 | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; |
15d35bc5 AL |
258 | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); |
259 | ||
260 | // We must ensure that we don't write to any sectors which are marked as | |
261 | // unused in the bitmap. We get away with setting all bits in the block | |
262 | // bitmap each time we write to a new block. This might cause Virtual PC to | |
263 | // miss sparse read optimization, but it's not a problem in terms of | |
264 | // correctness. | |
265 | if (write && (s->last_bitmap_offset != bitmap_offset)) { | |
266 | uint8_t bitmap[s->bitmap_size]; | |
267 | ||
268 | s->last_bitmap_offset = bitmap_offset; | |
269 | memset(bitmap, 0xff, s->bitmap_size); | |
078a458e | 270 | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
15d35bc5 | 271 | } |
3b46e624 | 272 | |
26a76461 | 273 | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", |
6a0f9e82 FB |
274 | // sector_num, pagetable_index, pageentry_index, |
275 | // bitmap_offset, block_offset); | |
276 | ||
277 | // disabled by reason | |
278 | #if 0 | |
279 | #ifdef CACHE | |
280 | if (bitmap_offset != s->last_bitmap) | |
281 | { | |
282 | lseek(s->fd, bitmap_offset, SEEK_SET); | |
283 | ||
284 | s->last_bitmap = bitmap_offset; | |
5fafdf24 | 285 | |
6a0f9e82 FB |
286 | // Scary! Bitmap is stored as big endian 32bit entries, |
287 | // while we used to look it up byte by byte | |
288 | read(s->fd, s->pageentry_u8, 512); | |
289 | for (i = 0; i < 128; i++) | |
290 | be32_to_cpus(&s->pageentry_u32[i]); | |
291 | } | |
292 | ||
293 | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) | |
294 | return -1; | |
295 | #else | |
296 | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); | |
5fafdf24 | 297 | |
6a0f9e82 FB |
298 | read(s->fd, &bitmap_entry, 1); |
299 | ||
300 | if ((bitmap_entry >> (pageentry_index % 8)) & 1) | |
301 | return -1; // not allocated | |
302 | #endif | |
303 | #endif | |
6a0f9e82 | 304 | |
b71d1c2e | 305 | return block_offset; |
6a0f9e82 FB |
306 | } |
307 | ||
15d35bc5 AL |
308 | /* |
309 | * Writes the footer to the end of the image file. This is needed when the | |
310 | * file grows as it overwrites the old footer | |
311 | * | |
312 | * Returns 0 on success and < 0 on error | |
313 | */ | |
314 | static int rewrite_footer(BlockDriverState* bs) | |
315 | { | |
316 | int ret; | |
317 | BDRVVPCState *s = bs->opaque; | |
318 | int64_t offset = s->free_data_block_offset; | |
319 | ||
078a458e | 320 | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
15d35bc5 AL |
321 | if (ret < 0) |
322 | return ret; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Allocates a new block. This involves writing a new footer and updating | |
329 | * the Block Allocation Table to use the space at the old end of the image | |
330 | * file (overwriting the old footer) | |
331 | * | |
332 | * Returns the sectors' offset in the image file on success and < 0 on error | |
333 | */ | |
334 | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) | |
335 | { | |
336 | BDRVVPCState *s = bs->opaque; | |
337 | int64_t bat_offset; | |
338 | uint32_t index, bat_value; | |
339 | int ret; | |
340 | uint8_t bitmap[s->bitmap_size]; | |
341 | ||
342 | // Check if sector_num is valid | |
343 | if ((sector_num < 0) || (sector_num > bs->total_sectors)) | |
344 | return -1; | |
345 | ||
346 | // Write entry into in-memory BAT | |
347 | index = (sector_num * 512) / s->block_size; | |
348 | if (s->pagetable[index] != 0xFFFFFFFF) | |
349 | return -1; | |
350 | ||
351 | s->pagetable[index] = s->free_data_block_offset / 512; | |
352 | ||
353 | // Initialize the block's bitmap | |
354 | memset(bitmap, 0xff, s->bitmap_size); | |
078a458e KW |
355 | bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
356 | s->bitmap_size); | |
15d35bc5 AL |
357 | |
358 | // Write new footer (the old one will be overwritten) | |
359 | s->free_data_block_offset += s->block_size + s->bitmap_size; | |
360 | ret = rewrite_footer(bs); | |
361 | if (ret < 0) | |
362 | goto fail; | |
363 | ||
364 | // Write BAT entry to disk | |
365 | bat_offset = s->bat_offset + (4 * index); | |
366 | bat_value = be32_to_cpu(s->pagetable[index]); | |
078a458e | 367 | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); |
15d35bc5 AL |
368 | if (ret < 0) |
369 | goto fail; | |
370 | ||
371 | return get_sector_offset(bs, sector_num, 0); | |
372 | ||
373 | fail: | |
374 | s->free_data_block_offset -= (s->block_size + s->bitmap_size); | |
375 | return -1; | |
376 | } | |
377 | ||
5fafdf24 | 378 | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
6a0f9e82 FB |
379 | uint8_t *buf, int nb_sectors) |
380 | { | |
6c6ea921 | 381 | BDRVVPCState *s = bs->opaque; |
6a0f9e82 | 382 | int ret; |
b71d1c2e | 383 | int64_t offset; |
6c6ea921 | 384 | int64_t sectors, sectors_per_block; |
6a0f9e82 FB |
385 | |
386 | while (nb_sectors > 0) { | |
15d35bc5 | 387 | offset = get_sector_offset(bs, sector_num, 0); |
b71d1c2e | 388 | |
6c6ea921 KW |
389 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
390 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
391 | if (sectors > nb_sectors) { | |
392 | sectors = nb_sectors; | |
393 | } | |
394 | ||
b71d1c2e | 395 | if (offset == -1) { |
6c6ea921 | 396 | memset(buf, 0, sectors * BDRV_SECTOR_SIZE); |
b71d1c2e | 397 | } else { |
6c6ea921 KW |
398 | ret = bdrv_pread(bs->file, offset, buf, |
399 | sectors * BDRV_SECTOR_SIZE); | |
400 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
b71d1c2e | 401 | return -1; |
6c6ea921 | 402 | } |
b71d1c2e AL |
403 | } |
404 | ||
6c6ea921 KW |
405 | nb_sectors -= sectors; |
406 | sector_num += sectors; | |
407 | buf += sectors * BDRV_SECTOR_SIZE; | |
6a0f9e82 FB |
408 | } |
409 | return 0; | |
410 | } | |
411 | ||
2914caa0 PB |
412 | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
413 | uint8_t *buf, int nb_sectors) | |
414 | { | |
415 | int ret; | |
416 | BDRVVPCState *s = bs->opaque; | |
417 | qemu_co_mutex_lock(&s->lock); | |
418 | ret = vpc_read(bs, sector_num, buf, nb_sectors); | |
419 | qemu_co_mutex_unlock(&s->lock); | |
420 | return ret; | |
421 | } | |
422 | ||
15d35bc5 AL |
423 | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
424 | const uint8_t *buf, int nb_sectors) | |
425 | { | |
6c6ea921 | 426 | BDRVVPCState *s = bs->opaque; |
15d35bc5 | 427 | int64_t offset; |
6c6ea921 | 428 | int64_t sectors, sectors_per_block; |
15d35bc5 AL |
429 | int ret; |
430 | ||
431 | while (nb_sectors > 0) { | |
432 | offset = get_sector_offset(bs, sector_num, 1); | |
433 | ||
6c6ea921 KW |
434 | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
435 | sectors = sectors_per_block - (sector_num % sectors_per_block); | |
436 | if (sectors > nb_sectors) { | |
437 | sectors = nb_sectors; | |
438 | } | |
439 | ||
15d35bc5 AL |
440 | if (offset == -1) { |
441 | offset = alloc_block(bs, sector_num); | |
442 | if (offset < 0) | |
443 | return -1; | |
444 | } | |
445 | ||
6c6ea921 KW |
446 | ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); |
447 | if (ret != sectors * BDRV_SECTOR_SIZE) { | |
15d35bc5 | 448 | return -1; |
6c6ea921 | 449 | } |
15d35bc5 | 450 | |
6c6ea921 KW |
451 | nb_sectors -= sectors; |
452 | sector_num += sectors; | |
453 | buf += sectors * BDRV_SECTOR_SIZE; | |
15d35bc5 AL |
454 | } |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
e183ef75 PB |
459 | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
460 | const uint8_t *buf, int nb_sectors) | |
461 | { | |
462 | int ret; | |
463 | BDRVVPCState *s = bs->opaque; | |
464 | qemu_co_mutex_lock(&s->lock); | |
465 | ret = vpc_write(bs, sector_num, buf, nb_sectors); | |
466 | qemu_co_mutex_unlock(&s->lock); | |
467 | return ret; | |
468 | } | |
469 | ||
8b94ff85 | 470 | static coroutine_fn int vpc_co_flush(BlockDriverState *bs) |
4a411185 | 471 | { |
8b94ff85 | 472 | return bdrv_co_flush(bs->file); |
4a411185 | 473 | } |
57c7d9e5 AL |
474 | |
475 | /* | |
476 | * Calculates the number of cylinders, heads and sectors per cylinder | |
477 | * based on a given number of sectors. This is the algorithm described | |
478 | * in the VHD specification. | |
479 | * | |
480 | * Note that the geometry doesn't always exactly match total_sectors but | |
481 | * may round it down. | |
6e9ea0c0 AJ |
482 | * |
483 | * Returns 0 on success, -EFBIG if the size is larger than 127 GB | |
57c7d9e5 | 484 | */ |
6e9ea0c0 | 485 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
57c7d9e5 AL |
486 | uint8_t* heads, uint8_t* secs_per_cyl) |
487 | { | |
488 | uint32_t cyls_times_heads; | |
489 | ||
490 | if (total_sectors > 65535 * 16 * 255) | |
6e9ea0c0 | 491 | return -EFBIG; |
57c7d9e5 AL |
492 | |
493 | if (total_sectors > 65535 * 16 * 63) { | |
494 | *secs_per_cyl = 255; | |
495 | *heads = 16; | |
496 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
497 | } else { | |
498 | *secs_per_cyl = 17; | |
499 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
500 | *heads = (cyls_times_heads + 1023) / 1024; | |
501 | ||
502 | if (*heads < 4) | |
503 | *heads = 4; | |
504 | ||
505 | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { | |
506 | *secs_per_cyl = 31; | |
507 | *heads = 16; | |
508 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
509 | } | |
510 | ||
511 | if (cyls_times_heads >= (*heads * 1024)) { | |
512 | *secs_per_cyl = 63; | |
513 | *heads = 16; | |
514 | cyls_times_heads = total_sectors / *secs_per_cyl; | |
515 | } | |
516 | } | |
517 | ||
dede4188 | 518 | *cyls = cyls_times_heads / *heads; |
6e9ea0c0 AJ |
519 | |
520 | return 0; | |
57c7d9e5 AL |
521 | } |
522 | ||
0e7e1989 | 523 | static int vpc_create(const char *filename, QEMUOptionParameter *options) |
57c7d9e5 AL |
524 | { |
525 | uint8_t buf[1024]; | |
526 | struct vhd_footer* footer = (struct vhd_footer*) buf; | |
527 | struct vhd_dyndisk_header* dyndisk_header = | |
528 | (struct vhd_dyndisk_header*) buf; | |
529 | int fd, i; | |
dede4188 SW |
530 | uint16_t cyls = 0; |
531 | uint8_t heads = 0; | |
532 | uint8_t secs_per_cyl = 0; | |
57c7d9e5 | 533 | size_t block_size, num_bat_entries; |
0e7e1989 | 534 | int64_t total_sectors = 0; |
f0ff243a | 535 | int ret = -EIO; |
57c7d9e5 | 536 | |
0e7e1989 | 537 | // Read out options |
2d56a546 ML |
538 | total_sectors = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n / |
539 | BDRV_SECTOR_SIZE; | |
57c7d9e5 | 540 | |
0e7e1989 | 541 | // Create the file |
57c7d9e5 AL |
542 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
543 | if (fd < 0) | |
544 | return -EIO; | |
545 | ||
dede4188 SW |
546 | /* Calculate matching total_size and geometry. Increase the number of |
547 | sectors requested until we get enough (or fail). */ | |
548 | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { | |
549 | if (calculate_geometry(total_sectors + i, | |
550 | &cyls, &heads, &secs_per_cyl)) { | |
f0ff243a BS |
551 | ret = -EFBIG; |
552 | goto fail; | |
dede4188 SW |
553 | } |
554 | } | |
57c7d9e5 AL |
555 | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
556 | ||
557 | // Prepare the Hard Disk Footer | |
558 | memset(buf, 0, 1024); | |
559 | ||
5ec4d682 | 560 | memcpy(footer->creator, "conectix", 8); |
57c7d9e5 | 561 | // TODO Check if "qemu" creator_app is ok for VPC |
5ec4d682 NF |
562 | memcpy(footer->creator_app, "qemu", 4); |
563 | memcpy(footer->creator_os, "Wi2k", 4); | |
57c7d9e5 AL |
564 | |
565 | footer->features = be32_to_cpu(0x02); | |
566 | footer->version = be32_to_cpu(0x00010000); | |
567 | footer->data_offset = be64_to_cpu(HEADER_SIZE); | |
568 | footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); | |
569 | ||
570 | // Version of Virtual PC 2007 | |
571 | footer->major = be16_to_cpu(0x0005); | |
572 | footer->minor =be16_to_cpu(0x0003); | |
573 | ||
574 | footer->orig_size = be64_to_cpu(total_sectors * 512); | |
575 | footer->size = be64_to_cpu(total_sectors * 512); | |
576 | ||
577 | footer->cyls = be16_to_cpu(cyls); | |
578 | footer->heads = heads; | |
579 | footer->secs_per_cyl = secs_per_cyl; | |
580 | ||
581 | footer->type = be32_to_cpu(VHD_DYNAMIC); | |
582 | ||
583 | // TODO uuid is missing | |
584 | ||
585 | footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); | |
586 | ||
587 | // Write the footer (twice: at the beginning and at the end) | |
588 | block_size = 0x200000; | |
589 | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); | |
590 | ||
f0ff243a BS |
591 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { |
592 | goto fail; | |
593 | } | |
57c7d9e5 | 594 | |
f0ff243a BS |
595 | if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { |
596 | goto fail; | |
597 | } | |
598 | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { | |
599 | goto fail; | |
600 | } | |
57c7d9e5 AL |
601 | |
602 | // Write the initial BAT | |
f0ff243a BS |
603 | if (lseek(fd, 3 * 512, SEEK_SET) < 0) { |
604 | goto fail; | |
605 | } | |
57c7d9e5 AL |
606 | |
607 | memset(buf, 0xFF, 512); | |
f0ff243a BS |
608 | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
609 | if (write(fd, buf, 512) != 512) { | |
610 | goto fail; | |
611 | } | |
612 | } | |
57c7d9e5 AL |
613 | |
614 | ||
615 | // Prepare the Dynamic Disk Header | |
616 | memset(buf, 0, 1024); | |
617 | ||
5ec4d682 | 618 | memcpy(dyndisk_header->magic, "cxsparse", 8); |
57c7d9e5 | 619 | |
78439f6a CA |
620 | /* |
621 | * Note: The spec is actually wrong here for data_offset, it says | |
622 | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. | |
623 | */ | |
624 | dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); | |
57c7d9e5 AL |
625 | dyndisk_header->table_offset = be64_to_cpu(3 * 512); |
626 | dyndisk_header->version = be32_to_cpu(0x00010000); | |
627 | dyndisk_header->block_size = be32_to_cpu(block_size); | |
628 | dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); | |
629 | ||
630 | dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); | |
631 | ||
632 | // Write the header | |
f0ff243a BS |
633 | if (lseek(fd, 512, SEEK_SET) < 0) { |
634 | goto fail; | |
635 | } | |
57c7d9e5 | 636 | |
f0ff243a BS |
637 | if (write(fd, buf, 1024) != 1024) { |
638 | goto fail; | |
639 | } | |
640 | ret = 0; | |
641 | ||
642 | fail: | |
57c7d9e5 | 643 | close(fd); |
f0ff243a | 644 | return ret; |
57c7d9e5 AL |
645 | } |
646 | ||
6a0f9e82 FB |
647 | static void vpc_close(BlockDriverState *bs) |
648 | { | |
649 | BDRVVPCState *s = bs->opaque; | |
7267c094 | 650 | g_free(s->pagetable); |
6a0f9e82 | 651 | #ifdef CACHE |
7267c094 | 652 | g_free(s->pageentry_u8); |
6a0f9e82 | 653 | #endif |
6a0f9e82 FB |
654 | } |
655 | ||
0e7e1989 | 656 | static QEMUOptionParameter vpc_create_options[] = { |
db08adf5 KW |
657 | { |
658 | .name = BLOCK_OPT_SIZE, | |
659 | .type = OPT_SIZE, | |
660 | .help = "Virtual disk size" | |
661 | }, | |
0e7e1989 KW |
662 | { NULL } |
663 | }; | |
664 | ||
5efa9d5a | 665 | static BlockDriver bdrv_vpc = { |
4a411185 KW |
666 | .format_name = "vpc", |
667 | .instance_size = sizeof(BDRVVPCState), | |
c68b89ac | 668 | |
4a411185 KW |
669 | .bdrv_probe = vpc_probe, |
670 | .bdrv_open = vpc_open, | |
4a411185 KW |
671 | .bdrv_close = vpc_close, |
672 | .bdrv_create = vpc_create, | |
0e7e1989 | 673 | |
c68b89ac KW |
674 | .bdrv_read = vpc_co_read, |
675 | .bdrv_write = vpc_co_write, | |
676 | .bdrv_co_flush_to_disk = vpc_co_flush, | |
677 | ||
0e7e1989 | 678 | .create_options = vpc_create_options, |
6a0f9e82 | 679 | }; |
5efa9d5a AL |
680 | |
681 | static void bdrv_vpc_init(void) | |
682 | { | |
683 | bdrv_register(&bdrv_vpc); | |
684 | } | |
685 | ||
686 | block_init(bdrv_vpc_init); |