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f42be642 | 1 | /** @file\r |
adbcbf8f | 2 | Decode a hard disk partitioned with the legacy MBR found on most PC's\r |
3 | \r | |
4 | MBR - Master Boot Record is in the first sector of a partitioned hard disk.\r | |
5 | The MBR supports four partitions per disk. The MBR also contains legacy\r | |
d1102dba LG |
6 | code that is not run on an EFI system. The legacy code reads the\r |
7 | first sector of the active partition into memory and\r | |
adbcbf8f | 8 | \r |
d1102dba LG |
9 | BPB - BIOS Parameter Block is in the first sector of a FAT file system.\r |
10 | The BPB contains information about the FAT file system. The BPB is\r | |
adbcbf8f | 11 | always on the first sector of a media. The first sector also contains\r |
12 | the legacy boot strap code.\r | |
13 | \r | |
709c9fd5 | 14 | Copyright (c) 2018 Qualcomm Datacenter Technologies, Inc.\r |
01331951 | 15 | Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>\r |
d1102dba | 16 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
e5eed7d3 | 17 | This program and the accompanying materials\r |
f42be642 | 18 | are licensed and made available under the terms and conditions of the BSD License\r |
19 | which accompanies this distribution. The full text of the license may be found at\r | |
20 | http://opensource.org/licenses/bsd-license.php\r | |
21 | \r | |
22 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
23 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
24 | \r | |
25 | **/\r | |
adbcbf8f | 26 | \r |
27 | #include "Partition.h"\r | |
28 | \r | |
a8d0c20e | 29 | /**\r |
30 | Test to see if the Mbr buffer is a valid MBR.\r | |
31 | \r | |
32 | @param Mbr Parent Handle.\r | |
33 | @param LastLba Last Lba address on the device.\r | |
d1102dba | 34 | \r |
a8d0c20e | 35 | @retval TRUE Mbr is a Valid MBR.\r |
36 | @retval FALSE Mbr is not a Valid MBR.\r | |
37 | \r | |
38 | **/\r | |
adbcbf8f | 39 | BOOLEAN\r |
40 | PartitionValidMbr (\r | |
41 | IN MASTER_BOOT_RECORD *Mbr,\r | |
42 | IN EFI_LBA LastLba\r | |
43 | )\r | |
adbcbf8f | 44 | {\r |
45 | UINT32 StartingLBA;\r | |
46 | UINT32 EndingLBA;\r | |
47 | UINT32 NewEndingLBA;\r | |
48 | INTN Index1;\r | |
49 | INTN Index2;\r | |
50 | BOOLEAN MbrValid;\r | |
51 | \r | |
52 | if (Mbr->Signature != MBR_SIGNATURE) {\r | |
53 | return FALSE;\r | |
54 | }\r | |
55 | //\r | |
56 | // The BPB also has this signature, so it can not be used alone.\r | |
57 | //\r | |
58 | MbrValid = FALSE;\r | |
59 | for (Index1 = 0; Index1 < MAX_MBR_PARTITIONS; Index1++) {\r | |
60 | if (Mbr->Partition[Index1].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) == 0) {\r | |
61 | continue;\r | |
62 | }\r | |
63 | \r | |
64 | MbrValid = TRUE;\r | |
65 | StartingLBA = UNPACK_UINT32 (Mbr->Partition[Index1].StartingLBA);\r | |
66 | EndingLBA = StartingLBA + UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) - 1;\r | |
67 | if (EndingLBA > LastLba) {\r | |
68 | //\r | |
69 | // Compatibility Errata:\r | |
70 | // Some systems try to hide drive space with their INT 13h driver\r | |
71 | // This does not hide space from the OS driver. This means the MBR\r | |
72 | // that gets created from DOS is smaller than the MBR created from\r | |
73 | // a real OS (NT & Win98). This leads to BlockIo->LastBlock being\r | |
74 | // wrong on some systems FDISKed by the OS.\r | |
75 | //\r | |
76 | // return FALSE since no block devices on a system are implemented\r | |
77 | // with INT 13h\r | |
78 | //\r | |
d1102dba | 79 | \r |
01331951 SEHM |
80 | DEBUG((EFI_D_INFO, "PartitionValidMbr: Bad MBR partition size EndingLBA(%1x) > LastLBA(%1x)\n", EndingLBA, LastLba));\r |
81 | \r | |
adbcbf8f | 82 | return FALSE;\r |
83 | }\r | |
84 | \r | |
85 | for (Index2 = Index1 + 1; Index2 < MAX_MBR_PARTITIONS; Index2++) {\r | |
86 | if (Mbr->Partition[Index2].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index2].SizeInLBA) == 0) {\r | |
87 | continue;\r | |
88 | }\r | |
89 | \r | |
90 | NewEndingLBA = UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) + UNPACK_UINT32 (Mbr->Partition[Index2].SizeInLBA) - 1;\r | |
91 | if (NewEndingLBA >= StartingLBA && UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) <= EndingLBA) {\r | |
92 | //\r | |
93 | // This region overlaps with the Index1'th region\r | |
94 | //\r | |
95 | return FALSE;\r | |
96 | }\r | |
97 | }\r | |
98 | }\r | |
99 | //\r | |
ea7cb08c | 100 | // None of the regions overlapped so MBR is O.K.\r |
adbcbf8f | 101 | //\r |
102 | return MbrValid;\r | |
103 | }\r | |
104 | \r | |
a8d0c20e | 105 | \r |
106 | /**\r | |
107 | Install child handles if the Handle supports MBR format.\r | |
108 | \r | |
490b5ea1 | 109 | @param[in] This Calling context.\r |
110 | @param[in] Handle Parent Handle.\r | |
111 | @param[in] DiskIo Parent DiskIo interface.\r | |
493d8e3a | 112 | @param[in] DiskIo2 Parent DiskIo2 interface.\r |
490b5ea1 | 113 | @param[in] BlockIo Parent BlockIo interface.\r |
114 | @param[in] BlockIo2 Parent BlockIo2 interface.\r | |
115 | @param[in] DevicePath Parent Device Path.\r | |
d1102dba | 116 | \r |
a8d0c20e | 117 | @retval EFI_SUCCESS A child handle was added.\r |
118 | @retval EFI_MEDIA_CHANGED Media change was detected.\r | |
119 | @retval Others MBR partition was not found.\r | |
120 | \r | |
121 | **/\r | |
adbcbf8f | 122 | EFI_STATUS\r |
123 | PartitionInstallMbrChildHandles (\r | |
124 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
125 | IN EFI_HANDLE Handle,\r | |
126 | IN EFI_DISK_IO_PROTOCOL *DiskIo,\r | |
493d8e3a | 127 | IN EFI_DISK_IO2_PROTOCOL *DiskIo2,\r |
adbcbf8f | 128 | IN EFI_BLOCK_IO_PROTOCOL *BlockIo,\r |
490b5ea1 | 129 | IN EFI_BLOCK_IO2_PROTOCOL *BlockIo2,\r |
adbcbf8f | 130 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r |
131 | )\r | |
adbcbf8f | 132 | {\r |
3a3d62d2 HW |
133 | EFI_STATUS Status;\r |
134 | MASTER_BOOT_RECORD *Mbr;\r | |
135 | UINT32 ExtMbrStartingLba;\r | |
136 | UINT32 Index;\r | |
137 | HARDDRIVE_DEVICE_PATH HdDev;\r | |
138 | HARDDRIVE_DEVICE_PATH ParentHdDev;\r | |
139 | EFI_STATUS Found;\r | |
140 | EFI_DEVICE_PATH_PROTOCOL *DevicePathNode;\r | |
141 | EFI_DEVICE_PATH_PROTOCOL *LastDevicePathNode;\r | |
142 | UINT32 BlockSize;\r | |
143 | UINT32 MediaId;\r | |
144 | EFI_LBA LastBlock;\r | |
145 | EFI_PARTITION_INFO_PROTOCOL PartitionInfo;\r | |
adbcbf8f | 146 | \r |
adbcbf8f | 147 | Found = EFI_NOT_FOUND;\r |
148 | \r | |
490b5ea1 | 149 | BlockSize = BlockIo->Media->BlockSize;\r |
150 | MediaId = BlockIo->Media->MediaId;\r | |
151 | LastBlock = BlockIo->Media->LastBlock;\r | |
152 | \r | |
153 | Mbr = AllocatePool (BlockSize);\r | |
adbcbf8f | 154 | if (Mbr == NULL) {\r |
737dfc36 | 155 | return Found;\r |
adbcbf8f | 156 | }\r |
157 | \r | |
96f99e1d | 158 | Status = DiskIo->ReadDisk (\r |
159 | DiskIo,\r | |
490b5ea1 | 160 | MediaId,\r |
96f99e1d | 161 | 0,\r |
490b5ea1 | 162 | BlockSize,\r |
96f99e1d | 163 | Mbr\r |
164 | );\r | |
adbcbf8f | 165 | if (EFI_ERROR (Status)) {\r |
166 | Found = Status;\r | |
167 | goto Done;\r | |
168 | }\r | |
490b5ea1 | 169 | if (!PartitionValidMbr (Mbr, LastBlock)) {\r |
adbcbf8f | 170 | goto Done;\r |
171 | }\r | |
172 | //\r | |
173 | // We have a valid mbr - add each partition\r | |
174 | //\r | |
175 | //\r | |
176 | // Get starting and ending LBA of the parent block device.\r | |
177 | //\r | |
178 | LastDevicePathNode = NULL;\r | |
179 | ZeroMem (&ParentHdDev, sizeof (ParentHdDev));\r | |
180 | DevicePathNode = DevicePath;\r | |
1232b214 | 181 | while (!IsDevicePathEnd (DevicePathNode)) {\r |
adbcbf8f | 182 | LastDevicePathNode = DevicePathNode;\r |
1232b214 | 183 | DevicePathNode = NextDevicePathNode (DevicePathNode);\r |
adbcbf8f | 184 | }\r |
185 | \r | |
186 | if (LastDevicePathNode != NULL) {\r | |
187 | if (DevicePathType (LastDevicePathNode) == MEDIA_DEVICE_PATH &&\r | |
188 | DevicePathSubType (LastDevicePathNode) == MEDIA_HARDDRIVE_DP\r | |
189 | ) {\r | |
190 | CopyMem (&ParentHdDev, LastDevicePathNode, sizeof (ParentHdDev));\r | |
191 | } else {\r | |
192 | LastDevicePathNode = NULL;\r | |
193 | }\r | |
194 | }\r | |
195 | \r | |
adbcbf8f | 196 | ZeroMem (&HdDev, sizeof (HdDev));\r |
197 | HdDev.Header.Type = MEDIA_DEVICE_PATH;\r | |
198 | HdDev.Header.SubType = MEDIA_HARDDRIVE_DP;\r | |
199 | SetDevicePathNodeLength (&HdDev.Header, sizeof (HdDev));\r | |
200 | HdDev.MBRType = MBR_TYPE_PCAT;\r | |
201 | HdDev.SignatureType = SIGNATURE_TYPE_MBR;\r | |
202 | \r | |
203 | if (LastDevicePathNode == NULL) {\r | |
204 | //\r | |
205 | // This is a MBR, add each partition\r | |
206 | //\r | |
207 | for (Index = 0; Index < MAX_MBR_PARTITIONS; Index++) {\r | |
208 | if (Mbr->Partition[Index].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index].SizeInLBA) == 0) {\r | |
209 | //\r | |
210 | // Don't use null MBR entries\r | |
211 | //\r | |
212 | continue;\r | |
213 | }\r | |
214 | \r | |
215 | if (Mbr->Partition[Index].OSIndicator == PMBR_GPT_PARTITION) {\r | |
216 | //\r | |
217 | // This is the guard MBR for the GPT. If you ever see a GPT disk with zero partitions you can get here.\r | |
d1102dba | 218 | // We can not produce an MBR BlockIo for this device as the MBR spans the GPT headers. So formating\r |
adbcbf8f | 219 | // this BlockIo would corrupt the GPT structures and require a recovery that would corrupt the format\r |
d1102dba | 220 | // that corrupted the GPT partition.\r |
adbcbf8f | 221 | //\r |
222 | continue;\r | |
223 | }\r | |
224 | \r | |
e665a69d | 225 | HdDev.PartitionNumber = Index + 1;\r |
adbcbf8f | 226 | HdDev.PartitionStart = UNPACK_UINT32 (Mbr->Partition[Index].StartingLBA);\r |
227 | HdDev.PartitionSize = UNPACK_UINT32 (Mbr->Partition[Index].SizeInLBA);\r | |
48557c65 | 228 | CopyMem (HdDev.Signature, &(Mbr->UniqueMbrSignature[0]), sizeof (Mbr->UniqueMbrSignature));\r |
adbcbf8f | 229 | \r |
3a3d62d2 HW |
230 | ZeroMem (&PartitionInfo, sizeof (EFI_PARTITION_INFO_PROTOCOL));\r |
231 | PartitionInfo.Revision = EFI_PARTITION_INFO_PROTOCOL_REVISION;\r | |
232 | PartitionInfo.Type = PARTITION_TYPE_MBR;\r | |
233 | if (Mbr->Partition[Index].OSIndicator == EFI_PARTITION) {\r | |
234 | PartitionInfo.System = 1;\r | |
235 | }\r | |
236 | CopyMem (&PartitionInfo.Info.Mbr, &Mbr->Partition[Index], sizeof (MBR_PARTITION_RECORD));\r | |
237 | \r | |
adbcbf8f | 238 | Status = PartitionInstallChildHandle (\r |
239 | This,\r | |
240 | Handle,\r | |
241 | DiskIo,\r | |
493d8e3a | 242 | DiskIo2,\r |
adbcbf8f | 243 | BlockIo,\r |
490b5ea1 | 244 | BlockIo2,\r |
adbcbf8f | 245 | DevicePath,\r |
246 | (EFI_DEVICE_PATH_PROTOCOL *) &HdDev,\r | |
3a3d62d2 | 247 | &PartitionInfo,\r |
adbcbf8f | 248 | HdDev.PartitionStart,\r |
249 | HdDev.PartitionStart + HdDev.PartitionSize - 1,\r | |
709c9fd5 JB |
250 | MBR_SIZE,\r |
251 | ((Mbr->Partition[Index].OSIndicator == EFI_PARTITION) ? &gEfiPartTypeSystemPartGuid: NULL)\r | |
adbcbf8f | 252 | );\r |
253 | \r | |
254 | if (!EFI_ERROR (Status)) {\r | |
255 | Found = EFI_SUCCESS;\r | |
256 | }\r | |
257 | }\r | |
258 | } else {\r | |
259 | //\r | |
260 | // It's an extended partition. Follow the extended partition\r | |
261 | // chain to get all the logical drives\r | |
262 | //\r | |
e665a69d | 263 | Index = 0;\r |
adbcbf8f | 264 | ExtMbrStartingLba = 0;\r |
265 | \r | |
266 | do {\r | |
267 | \r | |
96f99e1d | 268 | Status = DiskIo->ReadDisk (\r |
269 | DiskIo,\r | |
490b5ea1 | 270 | MediaId,\r |
271 | MultU64x32 (ExtMbrStartingLba, BlockSize),\r | |
272 | BlockSize,\r | |
96f99e1d | 273 | Mbr\r |
274 | );\r | |
adbcbf8f | 275 | if (EFI_ERROR (Status)) {\r |
276 | Found = Status;\r | |
277 | goto Done;\r | |
278 | }\r | |
279 | \r | |
c63cd426 | 280 | if (UNPACK_UINT32 (Mbr->Partition[0].SizeInLBA) == 0) {\r |
adbcbf8f | 281 | break;\r |
282 | }\r | |
283 | \r | |
284 | if ((Mbr->Partition[0].OSIndicator == EXTENDED_DOS_PARTITION) ||\r | |
285 | (Mbr->Partition[0].OSIndicator == EXTENDED_WINDOWS_PARTITION)) {\r | |
286 | ExtMbrStartingLba = UNPACK_UINT32 (Mbr->Partition[0].StartingLBA);\r | |
287 | continue;\r | |
288 | }\r | |
e665a69d | 289 | HdDev.PartitionNumber = ++Index;\r |
adbcbf8f | 290 | HdDev.PartitionStart = UNPACK_UINT32 (Mbr->Partition[0].StartingLBA) + ExtMbrStartingLba + ParentHdDev.PartitionStart;\r |
291 | HdDev.PartitionSize = UNPACK_UINT32 (Mbr->Partition[0].SizeInLBA);\r | |
292 | if ((HdDev.PartitionStart + HdDev.PartitionSize - 1 >= ParentHdDev.PartitionStart + ParentHdDev.PartitionSize) ||\r | |
293 | (HdDev.PartitionStart <= ParentHdDev.PartitionStart)) {\r | |
294 | break;\r | |
295 | }\r | |
296 | \r | |
297 | //\r | |
298 | // The signature in EBR(Extended Boot Record) should always be 0.\r | |
299 | //\r | |
300 | *((UINT32 *) &HdDev.Signature[0]) = 0;\r | |
301 | \r | |
3a3d62d2 HW |
302 | ZeroMem (&PartitionInfo, sizeof (EFI_PARTITION_INFO_PROTOCOL));\r |
303 | PartitionInfo.Revision = EFI_PARTITION_INFO_PROTOCOL_REVISION;\r | |
304 | PartitionInfo.Type = PARTITION_TYPE_MBR;\r | |
305 | if (Mbr->Partition[0].OSIndicator == EFI_PARTITION) {\r | |
306 | PartitionInfo.System = 1;\r | |
307 | }\r | |
308 | CopyMem (&PartitionInfo.Info.Mbr, &Mbr->Partition[0], sizeof (MBR_PARTITION_RECORD));\r | |
309 | \r | |
adbcbf8f | 310 | Status = PartitionInstallChildHandle (\r |
490b5ea1 | 311 | This,\r |
312 | Handle,\r | |
313 | DiskIo,\r | |
493d8e3a | 314 | DiskIo2,\r |
490b5ea1 | 315 | BlockIo,\r |
316 | BlockIo2,\r | |
317 | DevicePath,\r | |
318 | (EFI_DEVICE_PATH_PROTOCOL *) &HdDev,\r | |
3a3d62d2 | 319 | &PartitionInfo,\r |
490b5ea1 | 320 | HdDev.PartitionStart - ParentHdDev.PartitionStart,\r |
321 | HdDev.PartitionStart - ParentHdDev.PartitionStart + HdDev.PartitionSize - 1,\r | |
709c9fd5 JB |
322 | MBR_SIZE,\r |
323 | ((Mbr->Partition[0].OSIndicator == EFI_PARTITION) ? &gEfiPartTypeSystemPartGuid: NULL)\r | |
490b5ea1 | 324 | );\r |
adbcbf8f | 325 | if (!EFI_ERROR (Status)) {\r |
326 | Found = EFI_SUCCESS;\r | |
327 | }\r | |
328 | \r | |
329 | if ((Mbr->Partition[1].OSIndicator != EXTENDED_DOS_PARTITION) &&\r | |
330 | (Mbr->Partition[1].OSIndicator != EXTENDED_WINDOWS_PARTITION)\r | |
331 | ) {\r | |
332 | break;\r | |
333 | }\r | |
334 | \r | |
335 | ExtMbrStartingLba = UNPACK_UINT32 (Mbr->Partition[1].StartingLBA);\r | |
336 | //\r | |
337 | // Don't allow partition to be self referencing\r | |
338 | //\r | |
339 | if (ExtMbrStartingLba == 0) {\r | |
340 | break;\r | |
341 | }\r | |
342 | } while (ExtMbrStartingLba < ParentHdDev.PartitionSize);\r | |
343 | }\r | |
344 | \r | |
345 | Done:\r | |
346 | FreePool (Mbr);\r | |
347 | \r | |
348 | return Found;\r | |
349 | }\r |