]>
Commit | Line | Data |
---|---|---|
1 | /*++\r | |
2 | \r | |
3 | Copyright (c) 2006, Intel Corporation\r | |
4 | All rights reserved. This program and the accompanying materials\r | |
5 | are licensed and made available under the terms and conditions of the BSD License\r | |
6 | which accompanies this distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Gpt.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Decode a hard disk partitioned with the GPT scheme in the EFI 1.0\r | |
19 | specification.\r | |
20 | \r | |
21 | --*/\r | |
22 | \r | |
23 | //\r | |
24 | // Include common header file for this module.\r | |
25 | //\r | |
26 | #include "CommonHeader.h"\r | |
27 | \r | |
28 | #include "Partition.h"\r | |
29 | \r | |
30 | STATIC\r | |
31 | BOOLEAN\r | |
32 | PartitionValidGptTable (\r | |
33 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
34 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
35 | IN EFI_LBA Lba,\r | |
36 | OUT EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
37 | );\r | |
38 | \r | |
39 | STATIC\r | |
40 | BOOLEAN\r | |
41 | PartitionCheckGptEntryArrayCRC (\r | |
42 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
43 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
44 | IN EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
45 | );\r | |
46 | \r | |
47 | STATIC\r | |
48 | BOOLEAN\r | |
49 | PartitionRestoreGptTable (\r | |
50 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
51 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
52 | IN EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
53 | );\r | |
54 | \r | |
55 | STATIC\r | |
56 | VOID\r | |
57 | PartitionCheckGptEntry (\r | |
58 | IN EFI_PARTITION_TABLE_HEADER *PartHeader,\r | |
59 | IN EFI_PARTITION_ENTRY *PartEntry,\r | |
60 | OUT EFI_PARTITION_ENTRY_STATUS *PEntryStatus\r | |
61 | );\r | |
62 | \r | |
63 | STATIC\r | |
64 | BOOLEAN\r | |
65 | PartitionCheckCrcAltSize (\r | |
66 | IN UINTN MaxSize,\r | |
67 | IN UINTN Size,\r | |
68 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
69 | );\r | |
70 | \r | |
71 | STATIC\r | |
72 | BOOLEAN\r | |
73 | PartitionCheckCrc (\r | |
74 | IN UINTN MaxSize,\r | |
75 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
76 | );\r | |
77 | \r | |
78 | STATIC\r | |
79 | VOID\r | |
80 | PartitionSetCrcAltSize (\r | |
81 | IN UINTN Size,\r | |
82 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
83 | );\r | |
84 | \r | |
85 | STATIC\r | |
86 | VOID\r | |
87 | PartitionSetCrc (\r | |
88 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
89 | );\r | |
90 | \r | |
91 | EFI_STATUS\r | |
92 | PartitionInstallGptChildHandles (\r | |
93 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
94 | IN EFI_HANDLE Handle,\r | |
95 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
96 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
97 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
98 | )\r | |
99 | /*++\r | |
100 | \r | |
101 | Routine Description:\r | |
102 | Install child handles if the Handle supports GPT partition structure.\r | |
103 | \r | |
104 | Arguments:\r | |
105 | This - Calling context.\r | |
106 | Handle - Parent Handle\r | |
107 | DiskIo - Parent DiskIo interface\r | |
108 | BlockIo - Parent BlockIo interface\r | |
109 | DevicePath - Parent Device Path\r | |
110 | \r | |
111 | Returns:\r | |
112 | EFI_SUCCESS - Valid GPT disk\r | |
113 | EFI_MEDIA_CHANGED - Media changed Detected\r | |
114 | !EFI_SUCCESS - Not a valid GPT disk\r | |
115 | \r | |
116 | --*/\r | |
117 | {\r | |
118 | EFI_STATUS Status;\r | |
119 | UINT32 BlockSize;\r | |
120 | EFI_LBA LastBlock;\r | |
121 | MASTER_BOOT_RECORD *ProtectiveMbr;\r | |
122 | EFI_PARTITION_TABLE_HEADER *PrimaryHeader;\r | |
123 | EFI_PARTITION_TABLE_HEADER *BackupHeader;\r | |
124 | EFI_PARTITION_ENTRY *PartEntry;\r | |
125 | EFI_PARTITION_ENTRY_STATUS *PEntryStatus;\r | |
126 | UINTN Index;\r | |
127 | EFI_STATUS GptValid;\r | |
128 | HARDDRIVE_DEVICE_PATH HdDev;\r | |
129 | \r | |
130 | ProtectiveMbr = NULL;\r | |
131 | PrimaryHeader = NULL;\r | |
132 | BackupHeader = NULL;\r | |
133 | PartEntry = NULL;\r | |
134 | PEntryStatus = NULL;\r | |
135 | \r | |
136 | BlockSize = BlockIo->Media->BlockSize;\r | |
137 | LastBlock = BlockIo->Media->LastBlock;\r | |
138 | \r | |
139 | DEBUG ((EFI_D_INFO, " BlockSize : %d \n", BlockSize));\r | |
140 | DEBUG ((EFI_D_INFO, " LastBlock : %x \n", LastBlock));\r | |
141 | \r | |
142 | GptValid = EFI_NOT_FOUND;\r | |
143 | \r | |
144 | //\r | |
145 | // Allocate a buffer for the Protective MBR\r | |
146 | //\r | |
147 | ProtectiveMbr = AllocatePool (BlockSize);\r | |
148 | if (ProtectiveMbr == NULL) {\r | |
149 | return EFI_NOT_FOUND;\r | |
150 | }\r | |
151 | \r | |
152 | //\r | |
153 | // Read the Protective MBR from LBA #0\r | |
154 | //\r | |
155 | Status = BlockIo->ReadBlocks (\r | |
156 | BlockIo,\r | |
157 | BlockIo->Media->MediaId,\r | |
158 | 0,\r | |
159 | BlockIo->Media->BlockSize,\r | |
160 | ProtectiveMbr\r | |
161 | );\r | |
162 | if (EFI_ERROR (Status)) {\r | |
163 | GptValid = Status;\r | |
164 | goto Done;\r | |
165 | }\r | |
166 | //\r | |
167 | // Verify that the Protective MBR is valid\r | |
168 | //\r | |
169 | if (ProtectiveMbr->Partition[0].BootIndicator != 0x00 ||\r | |
170 | ProtectiveMbr->Partition[0].OSIndicator != PMBR_GPT_PARTITION ||\r | |
171 | UNPACK_UINT32 (ProtectiveMbr->Partition[0].StartingLBA) != 1\r | |
172 | ) {\r | |
173 | goto Done;\r | |
174 | }\r | |
175 | \r | |
176 | //\r | |
177 | // Allocate the GPT structures\r | |
178 | //\r | |
179 | PrimaryHeader = AllocateZeroPool (sizeof (EFI_PARTITION_TABLE_HEADER));\r | |
180 | if (PrimaryHeader == NULL) {\r | |
181 | goto Done;\r | |
182 | }\r | |
183 | \r | |
184 | BackupHeader = AllocateZeroPool (sizeof (EFI_PARTITION_TABLE_HEADER));\r | |
185 | \r | |
186 | if (BackupHeader == NULL) {\r | |
187 | goto Done;\r | |
188 | }\r | |
189 | \r | |
190 | //\r | |
191 | // Check primary and backup partition tables\r | |
192 | //\r | |
193 | if (!PartitionValidGptTable (BlockIo, DiskIo, PRIMARY_PART_HEADER_LBA, PrimaryHeader)) {\r | |
194 | DEBUG ((EFI_D_INFO, " Not Valid primary partition table\n"));\r | |
195 | \r | |
196 | if (!PartitionValidGptTable (BlockIo, DiskIo, LastBlock, BackupHeader)) {\r | |
197 | DEBUG ((EFI_D_INFO, " Not Valid backup partition table\n"));\r | |
198 | goto Done;\r | |
199 | } else {\r | |
200 | DEBUG ((EFI_D_INFO, " Valid backup partition table\n"));\r | |
201 | DEBUG ((EFI_D_INFO, " Restore primary partition table by the backup\n"));\r | |
202 | if (!PartitionRestoreGptTable (BlockIo, DiskIo, BackupHeader)) {\r | |
203 | DEBUG ((EFI_D_INFO, " Restore primary partition table error\n"));\r | |
204 | }\r | |
205 | \r | |
206 | if (PartitionValidGptTable (BlockIo, DiskIo, BackupHeader->AlternateLBA, PrimaryHeader)) {\r | |
207 | DEBUG ((EFI_D_INFO, " Restore backup partition table success\n"));\r | |
208 | }\r | |
209 | }\r | |
210 | } else if (!PartitionValidGptTable (BlockIo, DiskIo, PrimaryHeader->AlternateLBA, BackupHeader)) {\r | |
211 | DEBUG ((EFI_D_INFO, " Valid primary and !Valid backup partition table\n"));\r | |
212 | DEBUG ((EFI_D_INFO, " Restore backup partition table by the primary\n"));\r | |
213 | if (!PartitionRestoreGptTable (BlockIo, DiskIo, PrimaryHeader)) {\r | |
214 | DEBUG ((EFI_D_INFO, " Restore backup partition table error\n"));\r | |
215 | }\r | |
216 | \r | |
217 | if (PartitionValidGptTable (BlockIo, DiskIo, PrimaryHeader->AlternateLBA, BackupHeader)) {\r | |
218 | DEBUG ((EFI_D_INFO, " Restore backup partition table success\n"));\r | |
219 | }\r | |
220 | \r | |
221 | }\r | |
222 | \r | |
223 | DEBUG ((EFI_D_INFO, " Valid primary and Valid backup partition table\n"));\r | |
224 | \r | |
225 | //\r | |
226 | // Read the EFI Partition Entries\r | |
227 | //\r | |
228 | PartEntry = AllocatePool (PrimaryHeader->NumberOfPartitionEntries * sizeof (EFI_PARTITION_ENTRY));\r | |
229 | if (PartEntry == NULL) {\r | |
230 | DEBUG ((EFI_D_ERROR, "Allocate pool error\n"));\r | |
231 | goto Done;\r | |
232 | }\r | |
233 | \r | |
234 | Status = DiskIo->ReadDisk (\r | |
235 | DiskIo,\r | |
236 | BlockIo->Media->MediaId,\r | |
237 | MultU64x32(PrimaryHeader->PartitionEntryLBA, BlockSize),\r | |
238 | PrimaryHeader->NumberOfPartitionEntries * (PrimaryHeader->SizeOfPartitionEntry),\r | |
239 | PartEntry\r | |
240 | );\r | |
241 | if (EFI_ERROR (Status)) {\r | |
242 | GptValid = Status;\r | |
243 | DEBUG ((EFI_D_INFO, " Partition Entry ReadBlocks error\n"));\r | |
244 | goto Done;\r | |
245 | }\r | |
246 | \r | |
247 | DEBUG ((EFI_D_INFO, " Partition entries read block success\n"));\r | |
248 | \r | |
249 | DEBUG ((EFI_D_INFO, " Number of partition entries: %d\n", PrimaryHeader->NumberOfPartitionEntries));\r | |
250 | \r | |
251 | PEntryStatus = AllocateZeroPool (PrimaryHeader->NumberOfPartitionEntries * sizeof (EFI_PARTITION_ENTRY_STATUS));\r | |
252 | if (PEntryStatus == NULL) {\r | |
253 | DEBUG ((EFI_D_ERROR, "Allocate pool error\n"));\r | |
254 | goto Done;\r | |
255 | }\r | |
256 | \r | |
257 | //\r | |
258 | // Check the integrity of partition entries\r | |
259 | //\r | |
260 | PartitionCheckGptEntry (PrimaryHeader, PartEntry, PEntryStatus);\r | |
261 | \r | |
262 | //\r | |
263 | // If we got this far the GPT layout of the disk is valid and we should return true\r | |
264 | //\r | |
265 | GptValid = EFI_SUCCESS;\r | |
266 | \r | |
267 | //\r | |
268 | // Create child device handles\r | |
269 | //\r | |
270 | for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {\r | |
271 | if (CompareGuid (&PartEntry[Index].PartitionTypeGUID, &gEfiPartTypeUnusedGuid) ||\r | |
272 | PEntryStatus[Index].OutOfRange ||\r | |
273 | PEntryStatus[Index].Overlap\r | |
274 | ) {\r | |
275 | //\r | |
276 | // Don't use null EFI Partition Entries or Invalid Partition Entries\r | |
277 | //\r | |
278 | continue;\r | |
279 | }\r | |
280 | \r | |
281 | ZeroMem (&HdDev, sizeof (HdDev));\r | |
282 | HdDev.Header.Type = MEDIA_DEVICE_PATH;\r | |
283 | HdDev.Header.SubType = MEDIA_HARDDRIVE_DP;\r | |
284 | SetDevicePathNodeLength (&HdDev.Header, sizeof (HdDev));\r | |
285 | \r | |
286 | HdDev.PartitionNumber = (UINT32) Index + 1;\r | |
287 | HdDev.MBRType = MBR_TYPE_EFI_PARTITION_TABLE_HEADER;\r | |
288 | HdDev.SignatureType = SIGNATURE_TYPE_GUID;\r | |
289 | HdDev.PartitionStart = PartEntry[Index].StartingLBA;\r | |
290 | HdDev.PartitionSize = PartEntry[Index].EndingLBA - PartEntry[Index].StartingLBA + 1;\r | |
291 | CopyMem (HdDev.Signature, &PartEntry[Index].UniquePartitionGUID, sizeof (EFI_GUID));\r | |
292 | \r | |
293 | DEBUG ((EFI_D_INFO, " Index : %d\n", Index));\r | |
294 | DEBUG ((EFI_D_INFO, " Start LBA : %x\n", HdDev.PartitionStart));\r | |
295 | DEBUG ((EFI_D_INFO, " End LBA : %x\n", PartEntry[Index].EndingLBA));\r | |
296 | DEBUG ((EFI_D_INFO, " Partition size: %x\n", HdDev.PartitionSize));\r | |
297 | DEBUG ((EFI_D_INFO, " Start : %x", MultU64x32 (PartEntry[Index].StartingLBA, BlockSize)));\r | |
298 | DEBUG ((EFI_D_INFO, " End : %x\n", MultU64x32 (PartEntry[Index].EndingLBA, BlockSize)));\r | |
299 | \r | |
300 | Status = PartitionInstallChildHandle (\r | |
301 | This,\r | |
302 | Handle,\r | |
303 | DiskIo,\r | |
304 | BlockIo,\r | |
305 | DevicePath,\r | |
306 | (EFI_DEVICE_PATH_PROTOCOL *) &HdDev,\r | |
307 | PartEntry[Index].StartingLBA,\r | |
308 | PartEntry[Index].EndingLBA,\r | |
309 | BlockSize,\r | |
310 | CompareGuid(&PartEntry[Index].PartitionTypeGUID, &gEfiPartTypeSystemPartGuid)\r | |
311 | );\r | |
312 | }\r | |
313 | \r | |
314 | DEBUG ((EFI_D_INFO, "Prepare to Free Pool\n"));\r | |
315 | \r | |
316 | Done:\r | |
317 | if (ProtectiveMbr != NULL) {\r | |
318 | FreePool (ProtectiveMbr);\r | |
319 | }\r | |
320 | if (PrimaryHeader != NULL) {\r | |
321 | FreePool (PrimaryHeader);\r | |
322 | }\r | |
323 | if (BackupHeader != NULL) {\r | |
324 | FreePool (BackupHeader);\r | |
325 | }\r | |
326 | if (PartEntry != NULL) {\r | |
327 | FreePool (PartEntry);\r | |
328 | }\r | |
329 | if (PEntryStatus != NULL) {\r | |
330 | FreePool (PEntryStatus);\r | |
331 | }\r | |
332 | \r | |
333 | return GptValid;\r | |
334 | }\r | |
335 | \r | |
336 | STATIC\r | |
337 | BOOLEAN\r | |
338 | PartitionValidGptTable (\r | |
339 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
340 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
341 | IN EFI_LBA Lba,\r | |
342 | OUT EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
343 | )\r | |
344 | /*++\r | |
345 | \r | |
346 | Routine Description:\r | |
347 | Check if the GPT partition table is valid\r | |
348 | \r | |
349 | Arguments:\r | |
350 | BlockIo - Parent BlockIo interface\r | |
351 | DiskIo - Disk Io protocol.\r | |
352 | Lba - The starting Lba of the Partition Table\r | |
353 | PartHeader - Stores the partition table that is read\r | |
354 | \r | |
355 | Returns:\r | |
356 | TRUE - The partition table is valid\r | |
357 | FALSE - The partition table is not valid\r | |
358 | \r | |
359 | --*/\r | |
360 | {\r | |
361 | EFI_STATUS Status;\r | |
362 | UINT32 BlockSize;\r | |
363 | EFI_PARTITION_TABLE_HEADER *PartHdr;\r | |
364 | \r | |
365 | BlockSize = BlockIo->Media->BlockSize;\r | |
366 | \r | |
367 | PartHdr = AllocateZeroPool (BlockSize);\r | |
368 | \r | |
369 | if (PartHdr == NULL) {\r | |
370 | DEBUG ((EFI_D_ERROR, "Allocate pool error\n"));\r | |
371 | return FALSE;\r | |
372 | }\r | |
373 | //\r | |
374 | // Read the EFI Partition Table Header\r | |
375 | //\r | |
376 | Status = BlockIo->ReadBlocks (\r | |
377 | BlockIo,\r | |
378 | BlockIo->Media->MediaId,\r | |
379 | Lba,\r | |
380 | BlockSize,\r | |
381 | PartHdr\r | |
382 | );\r | |
383 | if (EFI_ERROR (Status)) {\r | |
384 | FreePool (PartHdr);\r | |
385 | return FALSE;\r | |
386 | }\r | |
387 | \r | |
388 | if ((PartHdr->Header.Signature == EFI_PTAB_HEADER_ID) ||\r | |
389 | !PartitionCheckCrc (BlockSize, &PartHdr->Header) ||\r | |
390 | PartHdr->MyLBA != Lba\r | |
391 | ) {\r | |
392 | DEBUG ((EFI_D_INFO, " !Valid efi partition table header\n"));\r | |
393 | FreePool (PartHdr);\r | |
394 | return FALSE;\r | |
395 | }\r | |
396 | \r | |
397 | CopyMem (PartHeader, PartHdr, sizeof (EFI_PARTITION_TABLE_HEADER));\r | |
398 | if (!PartitionCheckGptEntryArrayCRC (BlockIo, DiskIo, PartHeader)) {\r | |
399 | FreePool (PartHdr);\r | |
400 | return FALSE;\r | |
401 | }\r | |
402 | \r | |
403 | DEBUG ((EFI_D_INFO, " Valid efi partition table header\n"));\r | |
404 | FreePool (PartHdr);\r | |
405 | return TRUE;\r | |
406 | }\r | |
407 | \r | |
408 | STATIC\r | |
409 | BOOLEAN\r | |
410 | PartitionCheckGptEntryArrayCRC (\r | |
411 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
412 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
413 | IN EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
414 | )\r | |
415 | /*++\r | |
416 | \r | |
417 | Routine Description:\r | |
418 | \r | |
419 | Check if the CRC field in the Partition table header is valid\r | |
420 | for Partition entry array\r | |
421 | \r | |
422 | Arguments:\r | |
423 | \r | |
424 | BlockIo - parent BlockIo interface\r | |
425 | DiskIo - Disk Io Protocol.\r | |
426 | PartHeader - Partition table header structure\r | |
427 | \r | |
428 | Returns:\r | |
429 | \r | |
430 | TRUE - the CRC is valid\r | |
431 | FALSE - the CRC is invalid\r | |
432 | \r | |
433 | --*/\r | |
434 | {\r | |
435 | EFI_STATUS Status;\r | |
436 | UINT8 *Ptr;\r | |
437 | UINT32 Crc;\r | |
438 | UINTN Size;\r | |
439 | \r | |
440 | //\r | |
441 | // Read the EFI Partition Entries\r | |
442 | //\r | |
443 | Ptr = AllocatePool (PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry);\r | |
444 | if (Ptr == NULL) {\r | |
445 | DEBUG ((EFI_D_ERROR, " Allocate pool error\n"));\r | |
446 | return FALSE;\r | |
447 | }\r | |
448 | \r | |
449 | Status = DiskIo->ReadDisk (\r | |
450 | DiskIo,\r | |
451 | BlockIo->Media->MediaId,\r | |
452 | MultU64x32(PartHeader->PartitionEntryLBA, BlockIo->Media->BlockSize),\r | |
453 | PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry,\r | |
454 | Ptr\r | |
455 | );\r | |
456 | if (EFI_ERROR (Status)) {\r | |
457 | FreePool (Ptr);\r | |
458 | return FALSE;\r | |
459 | }\r | |
460 | \r | |
461 | Size = PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry;\r | |
462 | \r | |
463 | Status = gBS->CalculateCrc32 (Ptr, Size, &Crc);\r | |
464 | if (EFI_ERROR (Status)) {\r | |
465 | DEBUG ((EFI_D_ERROR, "CheckPEntryArrayCRC: Crc calculation failed\n"));\r | |
466 | FreePool (Ptr);\r | |
467 | return FALSE;\r | |
468 | }\r | |
469 | \r | |
470 | FreePool (Ptr);\r | |
471 | \r | |
472 | return (BOOLEAN) (PartHeader->PartitionEntryArrayCRC32 == Crc);\r | |
473 | }\r | |
474 | \r | |
475 | STATIC\r | |
476 | BOOLEAN\r | |
477 | PartitionRestoreGptTable (\r | |
478 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r | |
479 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
480 | IN EFI_PARTITION_TABLE_HEADER *PartHeader\r | |
481 | )\r | |
482 | /*++\r | |
483 | \r | |
484 | Routine Description:\r | |
485 | \r | |
486 | Restore Partition Table to its alternate place\r | |
487 | (Primary -> Backup or Backup -> Primary)\r | |
488 | \r | |
489 | Arguments:\r | |
490 | \r | |
491 | BlockIo - parent BlockIo interface\r | |
492 | DiskIo - Disk Io Protocol.\r | |
493 | PartHeader - the source Partition table header structure\r | |
494 | \r | |
495 | Returns:\r | |
496 | \r | |
497 | TRUE - Restoring succeeds\r | |
498 | FALSE - Restoring failed\r | |
499 | \r | |
500 | --*/\r | |
501 | {\r | |
502 | EFI_STATUS Status;\r | |
503 | UINTN BlockSize;\r | |
504 | EFI_PARTITION_TABLE_HEADER *PartHdr;\r | |
505 | EFI_LBA PEntryLBA;\r | |
506 | UINT8 *Ptr;\r | |
507 | \r | |
508 | PartHdr = NULL;\r | |
509 | Ptr = NULL;\r | |
510 | \r | |
511 | BlockSize = BlockIo->Media->BlockSize;\r | |
512 | \r | |
513 | PartHdr = AllocateZeroPool (BlockSize);\r | |
514 | \r | |
515 | if (PartHdr == NULL) {\r | |
516 | DEBUG ((EFI_D_ERROR, "Allocate pool error\n"));\r | |
517 | return FALSE;\r | |
518 | }\r | |
519 | \r | |
520 | PEntryLBA = (PartHeader->MyLBA == PRIMARY_PART_HEADER_LBA) ? \\r | |
521 | (PartHeader->LastUsableLBA + 1) : \\r | |
522 | (PRIMARY_PART_HEADER_LBA + 1);\r | |
523 | \r | |
524 | CopyMem (PartHdr, PartHeader, sizeof (EFI_PARTITION_TABLE_HEADER));\r | |
525 | \r | |
526 | PartHdr->MyLBA = PartHeader->AlternateLBA;\r | |
527 | PartHdr->AlternateLBA = PartHeader->MyLBA;\r | |
528 | PartHdr->PartitionEntryLBA = PEntryLBA;\r | |
529 | PartitionSetCrc ((EFI_TABLE_HEADER *) PartHdr);\r | |
530 | \r | |
531 | Status = BlockIo->WriteBlocks (BlockIo, BlockIo->Media->MediaId, PartHdr->MyLBA, BlockSize, PartHdr);\r | |
532 | if (EFI_ERROR (Status)) {\r | |
533 | goto Done;\r | |
534 | }\r | |
535 | \r | |
536 | Ptr = AllocatePool (PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry);\r | |
537 | if (Ptr == NULL) {\r | |
538 | DEBUG ((EFI_D_ERROR, " Allocate pool effor\n"));\r | |
539 | Status = EFI_OUT_OF_RESOURCES;\r | |
540 | goto Done;\r | |
541 | }\r | |
542 | \r | |
543 | Status = DiskIo->ReadDisk (\r | |
544 | DiskIo,\r | |
545 | BlockIo->Media->MediaId,\r | |
546 | MultU64x32(PartHeader->PartitionEntryLBA, BlockIo->Media->BlockSize),\r | |
547 | PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry,\r | |
548 | Ptr\r | |
549 | );\r | |
550 | if (EFI_ERROR (Status)) {\r | |
551 | goto Done;\r | |
552 | }\r | |
553 | \r | |
554 | Status = DiskIo->WriteDisk (\r | |
555 | DiskIo,\r | |
556 | BlockIo->Media->MediaId,\r | |
557 | MultU64x32(PEntryLBA, BlockIo->Media->BlockSize),\r | |
558 | PartHeader->NumberOfPartitionEntries * PartHeader->SizeOfPartitionEntry,\r | |
559 | Ptr\r | |
560 | );\r | |
561 | \r | |
562 | Done:\r | |
563 | FreePool (PartHdr);\r | |
564 | FreePool (Ptr);\r | |
565 | \r | |
566 | if (EFI_ERROR (Status)) {\r | |
567 | return FALSE;\r | |
568 | }\r | |
569 | \r | |
570 | return TRUE;\r | |
571 | }\r | |
572 | \r | |
573 | STATIC\r | |
574 | VOID\r | |
575 | PartitionCheckGptEntry (\r | |
576 | IN EFI_PARTITION_TABLE_HEADER *PartHeader,\r | |
577 | IN EFI_PARTITION_ENTRY *PartEntry,\r | |
578 | OUT EFI_PARTITION_ENTRY_STATUS *PEntryStatus\r | |
579 | )\r | |
580 | /*++\r | |
581 | \r | |
582 | Routine Description:\r | |
583 | \r | |
584 | Check each partition entry for its range\r | |
585 | \r | |
586 | Arguments:\r | |
587 | \r | |
588 | PartHeader - the partition table header\r | |
589 | PartEntry - the partition entry array\r | |
590 | PEntryStatus - the partition entry status array recording the status of\r | |
591 | each partition\r | |
592 | \r | |
593 | Returns:\r | |
594 | VOID\r | |
595 | \r | |
596 | --*/\r | |
597 | {\r | |
598 | EFI_LBA StartingLBA;\r | |
599 | EFI_LBA EndingLBA;\r | |
600 | UINTN Index1;\r | |
601 | UINTN Index2;\r | |
602 | \r | |
603 | DEBUG ((EFI_D_INFO, " start check partition entries\n"));\r | |
604 | for (Index1 = 0; Index1 < PartHeader->NumberOfPartitionEntries; Index1++) {\r | |
605 | if (CompareGuid (&PartEntry[Index1].PartitionTypeGUID, &gEfiPartTypeUnusedGuid)) {\r | |
606 | continue;\r | |
607 | }\r | |
608 | \r | |
609 | StartingLBA = PartEntry[Index1].StartingLBA;\r | |
610 | EndingLBA = PartEntry[Index1].EndingLBA;\r | |
611 | if (StartingLBA > EndingLBA ||\r | |
612 | StartingLBA < PartHeader->FirstUsableLBA ||\r | |
613 | StartingLBA > PartHeader->LastUsableLBA ||\r | |
614 | EndingLBA < PartHeader->FirstUsableLBA ||\r | |
615 | EndingLBA > PartHeader->LastUsableLBA\r | |
616 | ) {\r | |
617 | PEntryStatus[Index1].OutOfRange = TRUE;\r | |
618 | continue;\r | |
619 | }\r | |
620 | \r | |
621 | for (Index2 = Index1 + 1; Index2 < PartHeader->NumberOfPartitionEntries; Index2++) {\r | |
622 | \r | |
623 | if (CompareGuid (&PartEntry[Index2].PartitionTypeGUID, &gEfiPartTypeUnusedGuid)) {\r | |
624 | continue;\r | |
625 | }\r | |
626 | \r | |
627 | if (PartEntry[Index2].EndingLBA >= StartingLBA && PartEntry[Index2].StartingLBA <= EndingLBA) {\r | |
628 | //\r | |
629 | // This region overlaps with the Index1'th region\r | |
630 | //\r | |
631 | PEntryStatus[Index1].Overlap = TRUE;\r | |
632 | PEntryStatus[Index2].Overlap = TRUE;\r | |
633 | continue;\r | |
634 | \r | |
635 | }\r | |
636 | }\r | |
637 | }\r | |
638 | \r | |
639 | DEBUG ((EFI_D_INFO, " End check partition entries\n"));\r | |
640 | }\r | |
641 | \r | |
642 | STATIC\r | |
643 | VOID\r | |
644 | PartitionSetCrc (\r | |
645 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
646 | )\r | |
647 | /*++\r | |
648 | \r | |
649 | Routine Description:\r | |
650 | \r | |
651 | Updates the CRC32 value in the table header\r | |
652 | \r | |
653 | Arguments:\r | |
654 | \r | |
655 | Hdr - The table to update\r | |
656 | \r | |
657 | Returns:\r | |
658 | \r | |
659 | None\r | |
660 | \r | |
661 | --*/\r | |
662 | {\r | |
663 | PartitionSetCrcAltSize (Hdr->HeaderSize, Hdr);\r | |
664 | }\r | |
665 | \r | |
666 | STATIC\r | |
667 | VOID\r | |
668 | PartitionSetCrcAltSize (\r | |
669 | IN UINTN Size,\r | |
670 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
671 | )\r | |
672 | /*++\r | |
673 | \r | |
674 | Routine Description:\r | |
675 | \r | |
676 | Updates the CRC32 value in the table header\r | |
677 | \r | |
678 | Arguments:\r | |
679 | \r | |
680 | Size - The size of the table\r | |
681 | Hdr - The table to update\r | |
682 | \r | |
683 | Returns:\r | |
684 | \r | |
685 | None\r | |
686 | \r | |
687 | --*/\r | |
688 | {\r | |
689 | UINT32 Crc;\r | |
690 | \r | |
691 | Hdr->CRC32 = 0;\r | |
692 | gBS->CalculateCrc32 ((UINT8 *) Hdr, Size, &Crc);\r | |
693 | Hdr->CRC32 = Crc;\r | |
694 | }\r | |
695 | \r | |
696 | STATIC\r | |
697 | BOOLEAN\r | |
698 | PartitionCheckCrc (\r | |
699 | IN UINTN MaxSize,\r | |
700 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
701 | )\r | |
702 | /*++\r | |
703 | \r | |
704 | Routine Description:\r | |
705 | \r | |
706 | Checks the CRC32 value in the table header\r | |
707 | \r | |
708 | Arguments:\r | |
709 | \r | |
710 | MaxSize - Max Size limit\r | |
711 | Hdr - The table to check\r | |
712 | \r | |
713 | Returns:\r | |
714 | \r | |
715 | TRUE if the CRC is OK in the table\r | |
716 | \r | |
717 | --*/\r | |
718 | {\r | |
719 | return PartitionCheckCrcAltSize (MaxSize, Hdr->HeaderSize, Hdr);\r | |
720 | }\r | |
721 | \r | |
722 | STATIC\r | |
723 | BOOLEAN\r | |
724 | PartitionCheckCrcAltSize (\r | |
725 | IN UINTN MaxSize,\r | |
726 | IN UINTN Size,\r | |
727 | IN OUT EFI_TABLE_HEADER *Hdr\r | |
728 | )\r | |
729 | /*++\r | |
730 | \r | |
731 | Routine Description:\r | |
732 | \r | |
733 | Checks the CRC32 value in the table header\r | |
734 | \r | |
735 | Arguments:\r | |
736 | \r | |
737 | MaxSize - Max Size Limit\r | |
738 | Size - The size of the table\r | |
739 | Hdr - The table to check\r | |
740 | \r | |
741 | Returns:\r | |
742 | \r | |
743 | TRUE if the CRC is OK in the table\r | |
744 | \r | |
745 | --*/\r | |
746 | {\r | |
747 | UINT32 Crc;\r | |
748 | UINT32 OrgCrc;\r | |
749 | EFI_STATUS Status;\r | |
750 | \r | |
751 | Crc = 0;\r | |
752 | \r | |
753 | if (Size == 0) {\r | |
754 | //\r | |
755 | // If header size is 0 CRC will pass so return FALSE here\r | |
756 | //\r | |
757 | return FALSE;\r | |
758 | }\r | |
759 | \r | |
760 | if (MaxSize && Size > MaxSize) {\r | |
761 | DEBUG ((EFI_D_ERROR, "CheckCrc32: Size > MaxSize\n"));\r | |
762 | return FALSE;\r | |
763 | }\r | |
764 | //\r | |
765 | // clear old crc from header\r | |
766 | //\r | |
767 | OrgCrc = Hdr->CRC32;\r | |
768 | Hdr->CRC32 = 0;\r | |
769 | \r | |
770 | Status = gBS->CalculateCrc32 ((UINT8 *) Hdr, Size, &Crc);\r | |
771 | if (EFI_ERROR (Status)) {\r | |
772 | DEBUG ((EFI_D_ERROR, "CheckCrc32: Crc calculation failed\n"));\r | |
773 | return FALSE;\r | |
774 | }\r | |
775 | //\r | |
776 | // set results\r | |
777 | //\r | |
778 | Hdr->CRC32 = Crc;\r | |
779 | \r | |
780 | //\r | |
781 | // return status\r | |
782 | //\r | |
783 | DEBUG_CODE_BEGIN ();\r | |
784 | if (OrgCrc != Crc) {\r | |
785 | DEBUG ((EFI_D_ERROR, "CheckCrc32: Crc check failed\n"));\r | |
786 | }\r | |
787 | DEBUG_CODE_END ();\r | |
788 | \r | |
789 | return (BOOLEAN) (OrgCrc == Crc);\r | |
790 | }\r |