]>
Commit | Line | Data |
---|---|---|
0c18794e | 1 | /** @file\r |
2 | The sample implementation for SMM variable protocol. And this driver \r | |
3 | implements an SMI handler to communicate with the DXE runtime driver \r | |
4 | to provide variable services.\r | |
5 | \r | |
dc204d5a JY |
6 | Caution: This module requires additional review when modified.\r |
7 | This driver will have external input - variable data and communicate buffer in SMM mode.\r | |
8 | This external input must be validated carefully to avoid security issue like\r | |
9 | buffer overflow, integer overflow.\r | |
10 | \r | |
11 | SmmVariableHandler() will receive untrusted input and do basic validation.\r | |
12 | \r | |
13 | Each sub function VariableServiceGetVariable(), VariableServiceGetNextVariableName(), \r | |
14 | VariableServiceSetVariable(), VariableServiceQueryVariableInfo(), ReclaimForOS(), \r | |
15 | SmmVariableGetStatistics() should also do validation based on its own knowledge.\r | |
16 | \r | |
17 | Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>\r | |
0c18794e | 18 | This program and the accompanying materials \r |
19 | are licensed and made available under the terms and conditions of the BSD License \r | |
20 | which accompanies this distribution. The full text of the license may be found at \r | |
21 | http://opensource.org/licenses/bsd-license.php\r | |
22 | \r | |
23 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
24 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
25 | \r | |
26 | **/\r | |
27 | \r | |
28 | #include <Protocol/SmmVariable.h>\r | |
29 | #include <Protocol/SmmFirmwareVolumeBlock.h>\r | |
30 | #include <Protocol/SmmFaultTolerantWrite.h>\r | |
25a4e71a | 31 | #include <Protocol/SmmAccess2.h>\r |
32 | \r | |
0c18794e | 33 | #include <Library/SmmServicesTableLib.h>\r |
34 | \r | |
35 | #include <Guid/AuthenticatedVariableFormat.h>\r | |
36 | #include <Guid/SmmVariableCommon.h>\r | |
37 | #include "Variable.h"\r | |
38 | \r | |
25a4e71a | 39 | EFI_SMRAM_DESCRIPTOR *mSmramRanges;\r |
40 | UINTN mSmramRangeCount;\r | |
41 | \r | |
0c18794e | 42 | extern VARIABLE_INFO_ENTRY *gVariableInfo;\r |
43 | EFI_HANDLE mSmmVariableHandle = NULL;\r | |
44 | EFI_HANDLE mVariableHandle = NULL;\r | |
45 | BOOLEAN mAtRuntime = FALSE;\r | |
46 | EFI_GUID mZeroGuid = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}};\r | |
47 | \r | |
48 | EFI_SMM_VARIABLE_PROTOCOL gSmmVariable = {\r | |
49 | VariableServiceGetVariable,\r | |
50 | VariableServiceGetNextVariableName,\r | |
51 | VariableServiceSetVariable,\r | |
52 | VariableServiceQueryVariableInfo\r | |
53 | };\r | |
54 | \r | |
55 | \r | |
56 | /**\r | |
57 | Return TRUE if ExitBootServices () has been called.\r | |
58 | \r | |
59 | @retval TRUE If ExitBootServices () has been called.\r | |
60 | **/\r | |
61 | BOOLEAN\r | |
62 | AtRuntime (\r | |
63 | VOID\r | |
64 | )\r | |
65 | {\r | |
66 | return mAtRuntime;\r | |
67 | }\r | |
68 | \r | |
25a4e71a | 69 | /**\r |
70 | This function check if the address is in SMRAM.\r | |
71 | \r | |
72 | @param Buffer the buffer address to be checked.\r | |
73 | @param Length the buffer length to be checked.\r | |
74 | \r | |
75 | @retval TRUE this address is in SMRAM.\r | |
76 | @retval FALSE this address is NOT in SMRAM.\r | |
77 | **/\r | |
78 | BOOLEAN\r | |
79 | InternalIsAddressInSmram (\r | |
80 | IN EFI_PHYSICAL_ADDRESS Buffer,\r | |
81 | IN UINT64 Length\r | |
82 | )\r | |
83 | {\r | |
84 | UINTN Index;\r | |
85 | \r | |
86 | for (Index = 0; Index < mSmramRangeCount; Index ++) {\r | |
87 | if (((Buffer >= mSmramRanges[Index].CpuStart) && (Buffer < mSmramRanges[Index].CpuStart + mSmramRanges[Index].PhysicalSize)) ||\r | |
88 | ((mSmramRanges[Index].CpuStart >= Buffer) && (mSmramRanges[Index].CpuStart < Buffer + Length))) {\r | |
89 | return TRUE;\r | |
90 | }\r | |
91 | }\r | |
92 | \r | |
93 | return FALSE;\r | |
94 | }\r | |
95 | \r | |
96 | \r | |
0c18794e | 97 | /**\r |
98 | Initializes a basic mutual exclusion lock.\r | |
99 | \r | |
100 | This function initializes a basic mutual exclusion lock to the released state \r | |
101 | and returns the lock. Each lock provides mutual exclusion access at its task \r | |
102 | priority level. Since there is no preemption or multiprocessor support in EFI,\r | |
103 | acquiring the lock only consists of raising to the locks TPL.\r | |
104 | If Lock is NULL, then ASSERT().\r | |
105 | If Priority is not a valid TPL value, then ASSERT().\r | |
106 | \r | |
107 | @param Lock A pointer to the lock data structure to initialize.\r | |
108 | @param Priority EFI TPL is associated with the lock.\r | |
109 | \r | |
110 | @return The lock.\r | |
111 | \r | |
112 | **/\r | |
113 | EFI_LOCK *\r | |
114 | InitializeLock (\r | |
115 | IN OUT EFI_LOCK *Lock,\r | |
116 | IN EFI_TPL Priority\r | |
117 | )\r | |
118 | {\r | |
119 | return Lock;\r | |
120 | }\r | |
121 | \r | |
122 | /**\r | |
123 | Acquires lock only at boot time. Simply returns at runtime.\r | |
124 | \r | |
125 | This is a temperary function that will be removed when\r | |
126 | EfiAcquireLock() in UefiLib can handle the call in UEFI\r | |
127 | Runtimer driver in RT phase.\r | |
128 | It calls EfiAcquireLock() at boot time, and simply returns\r | |
129 | at runtime.\r | |
130 | \r | |
131 | @param Lock A pointer to the lock to acquire.\r | |
132 | \r | |
133 | **/\r | |
134 | VOID\r | |
135 | AcquireLockOnlyAtBootTime (\r | |
136 | IN EFI_LOCK *Lock\r | |
137 | )\r | |
138 | {\r | |
139 | \r | |
140 | }\r | |
141 | \r | |
142 | \r | |
143 | /**\r | |
144 | Releases lock only at boot time. Simply returns at runtime.\r | |
145 | \r | |
146 | This is a temperary function which will be removed when\r | |
147 | EfiReleaseLock() in UefiLib can handle the call in UEFI\r | |
148 | Runtimer driver in RT phase.\r | |
149 | It calls EfiReleaseLock() at boot time and simply returns\r | |
150 | at runtime.\r | |
151 | \r | |
152 | @param Lock A pointer to the lock to release.\r | |
153 | \r | |
154 | **/\r | |
155 | VOID\r | |
156 | ReleaseLockOnlyAtBootTime (\r | |
157 | IN EFI_LOCK *Lock\r | |
158 | )\r | |
159 | {\r | |
160 | \r | |
161 | }\r | |
162 | \r | |
163 | /**\r | |
164 | Retrive the SMM Fault Tolerent Write protocol interface.\r | |
165 | \r | |
166 | @param[out] FtwProtocol The interface of SMM Ftw protocol\r | |
167 | \r | |
168 | @retval EFI_SUCCESS The SMM FTW protocol instance was found and returned in FtwProtocol.\r | |
169 | @retval EFI_NOT_FOUND The SMM FTW protocol instance was not found.\r | |
170 | @retval EFI_INVALID_PARAMETER SarProtocol is NULL.\r | |
171 | \r | |
172 | **/\r | |
173 | EFI_STATUS\r | |
174 | GetFtwProtocol (\r | |
175 | OUT VOID **FtwProtocol\r | |
176 | )\r | |
177 | {\r | |
178 | EFI_STATUS Status;\r | |
179 | \r | |
180 | //\r | |
181 | // Locate Smm Fault Tolerent Write protocol\r | |
182 | //\r | |
183 | Status = gSmst->SmmLocateProtocol (\r | |
184 | &gEfiSmmFaultTolerantWriteProtocolGuid, \r | |
185 | NULL, \r | |
186 | FtwProtocol\r | |
187 | );\r | |
188 | return Status;\r | |
189 | }\r | |
190 | \r | |
191 | \r | |
192 | /**\r | |
193 | Retrive the SMM FVB protocol interface by HANDLE.\r | |
194 | \r | |
195 | @param[in] FvBlockHandle The handle of SMM FVB protocol that provides services for\r | |
196 | reading, writing, and erasing the target block.\r | |
197 | @param[out] FvBlock The interface of SMM FVB protocol\r | |
198 | \r | |
199 | @retval EFI_SUCCESS The interface information for the specified protocol was returned.\r | |
200 | @retval EFI_UNSUPPORTED The device does not support the SMM FVB protocol.\r | |
201 | @retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL.\r | |
202 | \r | |
203 | **/\r | |
204 | EFI_STATUS\r | |
205 | GetFvbByHandle (\r | |
206 | IN EFI_HANDLE FvBlockHandle,\r | |
207 | OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock\r | |
208 | )\r | |
209 | {\r | |
210 | //\r | |
211 | // To get the SMM FVB protocol interface on the handle\r | |
212 | //\r | |
213 | return gSmst->SmmHandleProtocol (\r | |
214 | FvBlockHandle,\r | |
215 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
216 | (VOID **) FvBlock\r | |
217 | );\r | |
218 | }\r | |
219 | \r | |
220 | \r | |
221 | /**\r | |
222 | Function returns an array of handles that support the SMM FVB protocol\r | |
223 | in a buffer allocated from pool. \r | |
224 | \r | |
225 | @param[out] NumberHandles The number of handles returned in Buffer.\r | |
226 | @param[out] Buffer A pointer to the buffer to return the requested\r | |
227 | array of handles that support SMM FVB protocol.\r | |
228 | \r | |
229 | @retval EFI_SUCCESS The array of handles was returned in Buffer, and the number of\r | |
230 | handles in Buffer was returned in NumberHandles.\r | |
231 | @retval EFI_NOT_FOUND No SMM FVB handle was found.\r | |
232 | @retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results.\r | |
233 | @retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL.\r | |
234 | \r | |
235 | **/\r | |
236 | EFI_STATUS\r | |
237 | GetFvbCountAndBuffer (\r | |
238 | OUT UINTN *NumberHandles,\r | |
239 | OUT EFI_HANDLE **Buffer\r | |
240 | )\r | |
241 | {\r | |
242 | EFI_STATUS Status;\r | |
243 | UINTN BufferSize;\r | |
244 | \r | |
245 | if ((NumberHandles == NULL) || (Buffer == NULL)) {\r | |
246 | return EFI_INVALID_PARAMETER;\r | |
247 | }\r | |
248 | \r | |
249 | BufferSize = 0;\r | |
250 | *NumberHandles = 0;\r | |
251 | *Buffer = NULL;\r | |
252 | Status = gSmst->SmmLocateHandle (\r | |
253 | ByProtocol,\r | |
254 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
255 | NULL,\r | |
256 | &BufferSize,\r | |
257 | *Buffer\r | |
258 | );\r | |
259 | if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {\r | |
260 | return EFI_NOT_FOUND;\r | |
261 | }\r | |
262 | \r | |
263 | *Buffer = AllocatePool (BufferSize);\r | |
264 | if (*Buffer == NULL) {\r | |
265 | return EFI_OUT_OF_RESOURCES;\r | |
266 | }\r | |
267 | \r | |
268 | Status = gSmst->SmmLocateHandle (\r | |
269 | ByProtocol,\r | |
270 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
271 | NULL,\r | |
272 | &BufferSize,\r | |
273 | *Buffer\r | |
274 | );\r | |
275 | \r | |
276 | *NumberHandles = BufferSize / sizeof(EFI_HANDLE);\r | |
277 | if (EFI_ERROR(Status)) {\r | |
278 | *NumberHandles = 0;\r | |
279 | }\r | |
280 | \r | |
281 | return Status;\r | |
282 | }\r | |
283 | \r | |
284 | \r | |
285 | /**\r | |
286 | Get the variable statistics information from the information buffer pointed by gVariableInfo.\r | |
287 | \r | |
dc204d5a JY |
288 | Caution: This function may be invoked at SMM runtime.\r |
289 | InfoEntry and InfoSize are external input. Care must be taken to make sure not security issue at runtime.\r | |
290 | \r | |
648f98d1 | 291 | @param[in, out] InfoEntry A pointer to the buffer of variable information entry.\r |
292 | On input, point to the variable information returned last time. if \r | |
293 | InfoEntry->VendorGuid is zero, return the first information.\r | |
294 | On output, point to the next variable information.\r | |
295 | @param[in, out] InfoSize On input, the size of the variable information buffer.\r | |
296 | On output, the returned variable information size.\r | |
297 | \r | |
298 | @retval EFI_SUCCESS The variable information is found and returned successfully.\r | |
299 | @retval EFI_UNSUPPORTED No variable inoformation exists in variable driver. The \r | |
300 | PcdVariableCollectStatistics should be set TRUE to support it.\r | |
301 | @retval EFI_BUFFER_TOO_SMALL The buffer is too small to hold the next variable information.\r | |
302 | @retval EFI_INVALID_PARAMETER Input parameter is invalid.\r | |
0c18794e | 303 | \r |
304 | **/\r | |
305 | EFI_STATUS\r | |
306 | SmmVariableGetStatistics (\r | |
307 | IN OUT VARIABLE_INFO_ENTRY *InfoEntry,\r | |
308 | IN OUT UINTN *InfoSize\r | |
309 | )\r | |
310 | {\r | |
311 | VARIABLE_INFO_ENTRY *VariableInfo;\r | |
312 | UINTN NameLength;\r | |
313 | UINTN StatisticsInfoSize;\r | |
314 | CHAR16 *InfoName;\r | |
315 | \r | |
648f98d1 | 316 | if (InfoEntry == NULL) {\r |
317 | return EFI_INVALID_PARAMETER;\r | |
318 | }\r | |
319 | \r | |
0c18794e | 320 | VariableInfo = gVariableInfo; \r |
321 | if (VariableInfo == NULL) {\r | |
322 | return EFI_UNSUPPORTED;\r | |
323 | }\r | |
324 | \r | |
325 | StatisticsInfoSize = sizeof (VARIABLE_INFO_ENTRY) + StrSize (VariableInfo->Name);\r | |
12373f2c | 326 | if (*InfoSize < StatisticsInfoSize) {\r |
0c18794e | 327 | *InfoSize = StatisticsInfoSize;\r |
328 | return EFI_BUFFER_TOO_SMALL;\r | |
329 | }\r | |
330 | InfoName = (CHAR16 *)(InfoEntry + 1);\r | |
331 | \r | |
332 | if (CompareGuid (&InfoEntry->VendorGuid, &mZeroGuid)) {\r | |
333 | //\r | |
334 | // Return the first variable info\r | |
335 | //\r | |
336 | CopyMem (InfoEntry, VariableInfo, sizeof (VARIABLE_INFO_ENTRY));\r | |
337 | CopyMem (InfoName, VariableInfo->Name, StrSize (VariableInfo->Name));\r | |
338 | *InfoSize = StatisticsInfoSize;\r | |
339 | return EFI_SUCCESS;\r | |
340 | }\r | |
341 | \r | |
342 | //\r | |
343 | // Get the next variable info\r | |
344 | //\r | |
345 | while (VariableInfo != NULL) {\r | |
346 | if (CompareGuid (&VariableInfo->VendorGuid, &InfoEntry->VendorGuid)) {\r | |
347 | NameLength = StrSize (VariableInfo->Name);\r | |
348 | if (NameLength == StrSize (InfoName)) {\r | |
349 | if (CompareMem (VariableInfo->Name, InfoName, NameLength) == 0) {\r | |
350 | //\r | |
351 | // Find the match one\r | |
352 | //\r | |
353 | VariableInfo = VariableInfo->Next;\r | |
354 | break;\r | |
355 | }\r | |
356 | }\r | |
357 | }\r | |
358 | VariableInfo = VariableInfo->Next;\r | |
359 | };\r | |
360 | \r | |
361 | if (VariableInfo == NULL) {\r | |
362 | *InfoSize = 0;\r | |
363 | return EFI_SUCCESS;\r | |
364 | }\r | |
365 | \r | |
366 | //\r | |
367 | // Output the new variable info\r | |
368 | //\r | |
369 | StatisticsInfoSize = sizeof (VARIABLE_INFO_ENTRY) + StrSize (VariableInfo->Name);\r | |
370 | if (*InfoSize < StatisticsInfoSize) {\r | |
371 | *InfoSize = StatisticsInfoSize;\r | |
372 | return EFI_BUFFER_TOO_SMALL;\r | |
373 | }\r | |
374 | \r | |
375 | CopyMem (InfoEntry, VariableInfo, sizeof (VARIABLE_INFO_ENTRY));\r | |
376 | CopyMem (InfoName, VariableInfo->Name, StrSize (VariableInfo->Name));\r | |
377 | *InfoSize = StatisticsInfoSize;\r | |
378 | \r | |
379 | return EFI_SUCCESS;\r | |
380 | }\r | |
381 | \r | |
382 | \r | |
383 | /**\r | |
384 | Communication service SMI Handler entry.\r | |
385 | \r | |
386 | This SMI handler provides services for the variable wrapper driver.\r | |
387 | \r | |
dc204d5a JY |
388 | Caution: This function may receive untrusted input.\r |
389 | This variable data and communicate buffer are external input, so this function will do basic validation.\r | |
390 | Each sub function VariableServiceGetVariable(), VariableServiceGetNextVariableName(), \r | |
391 | VariableServiceSetVariable(), VariableServiceQueryVariableInfo(), ReclaimForOS(), \r | |
392 | SmmVariableGetStatistics() should also do validation based on its own knowledge.\r | |
393 | \r | |
0c18794e | 394 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r |
395 | @param[in] RegisterContext Points to an optional handler context which was specified when the\r | |
396 | handler was registered.\r | |
397 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
398 | be conveyed from a non-SMM environment into an SMM environment.\r | |
399 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
400 | \r | |
401 | @retval EFI_SUCCESS The interrupt was handled and quiesced. No other handlers \r | |
402 | should still be called.\r | |
403 | @retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other handlers should \r | |
404 | still be called.\r | |
405 | @retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other handlers should still \r | |
406 | be called.\r | |
407 | @retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.\r | |
648f98d1 | 408 | \r |
0c18794e | 409 | **/\r |
410 | EFI_STATUS\r | |
411 | EFIAPI\r | |
412 | SmmVariableHandler (\r | |
413 | IN EFI_HANDLE DispatchHandle,\r | |
414 | IN CONST VOID *RegisterContext,\r | |
415 | IN OUT VOID *CommBuffer,\r | |
416 | IN OUT UINTN *CommBufferSize\r | |
417 | )\r | |
418 | {\r | |
419 | EFI_STATUS Status;\r | |
420 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader;\r | |
421 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
422 | SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *GetNextVariableName;\r | |
423 | SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *QueryVariableInfo;\r | |
424 | VARIABLE_INFO_ENTRY *VariableInfo;\r | |
425 | UINTN InfoSize;\r | |
426 | \r | |
25a4e71a | 427 | //\r |
428 | // If input is invalid, stop processing this SMI\r | |
429 | //\r | |
430 | if (CommBuffer == NULL || CommBufferSize == NULL) {\r | |
431 | return EFI_SUCCESS;\r | |
648f98d1 | 432 | }\r |
0c18794e | 433 | \r |
25a4e71a | 434 | if (*CommBufferSize < sizeof(SMM_VARIABLE_COMMUNICATE_HEADER) - 1) {\r |
435 | return EFI_SUCCESS;\r | |
436 | }\r | |
437 | \r | |
438 | if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)(UINTN)CommBuffer, *CommBufferSize)) {\r | |
439 | DEBUG ((EFI_D_ERROR, "SMM communication buffer size is in SMRAM!\n"));\r | |
440 | return EFI_SUCCESS;\r | |
441 | }\r | |
442 | \r | |
0c18794e | 443 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *)CommBuffer;\r |
25a4e71a | 444 | \r |
0c18794e | 445 | switch (SmmVariableFunctionHeader->Function) {\r |
446 | case SMM_VARIABLE_FUNCTION_GET_VARIABLE:\r | |
25a4e71a | 447 | SmmVariableHeader = (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *) SmmVariableFunctionHeader->Data;\r |
448 | InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) \r | |
449 | + SmmVariableHeader->DataSize + SmmVariableHeader->NameSize;\r | |
450 | \r | |
451 | //\r | |
452 | // SMRAM range check already covered before\r | |
453 | //\r | |
454 | if (InfoSize > *CommBufferSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_HEADER, Data)) {\r | |
455 | DEBUG ((EFI_D_ERROR, "Data size exceed communication buffer size limit!\n"));\r | |
456 | Status = EFI_ACCESS_DENIED;\r | |
457 | goto EXIT;\r | |
458 | }\r | |
459 | \r | |
0c18794e | 460 | Status = VariableServiceGetVariable (\r |
461 | SmmVariableHeader->Name,\r | |
462 | &SmmVariableHeader->Guid,\r | |
463 | &SmmVariableHeader->Attributes,\r | |
464 | &SmmVariableHeader->DataSize,\r | |
465 | (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize\r | |
466 | );\r | |
467 | break;\r | |
468 | \r | |
469 | case SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME:\r | |
470 | GetNextVariableName = (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *) SmmVariableFunctionHeader->Data;\r | |
25a4e71a | 471 | InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + GetNextVariableName->NameSize;\r |
472 | \r | |
473 | //\r | |
474 | // SMRAM range check already covered before\r | |
475 | //\r | |
476 | if (InfoSize > *CommBufferSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_HEADER, Data)) {\r | |
477 | DEBUG ((EFI_D_ERROR, "Data size exceed communication buffer size limit!\n"));\r | |
478 | Status = EFI_ACCESS_DENIED;\r | |
479 | goto EXIT;\r | |
480 | }\r | |
481 | \r | |
0c18794e | 482 | Status = VariableServiceGetNextVariableName (\r |
483 | &GetNextVariableName->NameSize,\r | |
484 | GetNextVariableName->Name,\r | |
485 | &GetNextVariableName->Guid\r | |
486 | );\r | |
487 | break;\r | |
488 | \r | |
489 | case SMM_VARIABLE_FUNCTION_SET_VARIABLE:\r | |
490 | SmmVariableHeader = (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *) SmmVariableFunctionHeader->Data;\r | |
491 | Status = VariableServiceSetVariable (\r | |
492 | SmmVariableHeader->Name,\r | |
493 | &SmmVariableHeader->Guid,\r | |
494 | SmmVariableHeader->Attributes,\r | |
495 | SmmVariableHeader->DataSize,\r | |
496 | (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize\r | |
497 | );\r | |
498 | break;\r | |
499 | \r | |
500 | case SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO:\r | |
501 | QueryVariableInfo = (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *) SmmVariableFunctionHeader->Data;\r | |
25a4e71a | 502 | InfoSize = sizeof(SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);\r |
503 | \r | |
504 | //\r | |
505 | // SMRAM range check already covered before\r | |
506 | //\r | |
507 | if (InfoSize > *CommBufferSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_HEADER, Data)) {\r | |
508 | DEBUG ((EFI_D_ERROR, "Data size exceed communication buffer size limit!\n"));\r | |
509 | Status = EFI_ACCESS_DENIED;\r | |
510 | goto EXIT;\r | |
511 | }\r | |
512 | \r | |
0c18794e | 513 | Status = VariableServiceQueryVariableInfo (\r |
514 | QueryVariableInfo->Attributes,\r | |
515 | &QueryVariableInfo->MaximumVariableStorageSize,\r | |
516 | &QueryVariableInfo->RemainingVariableStorageSize,\r | |
517 | &QueryVariableInfo->MaximumVariableSize\r | |
518 | );\r | |
519 | break;\r | |
520 | \r | |
521 | case SMM_VARIABLE_FUNCTION_READY_TO_BOOT:\r | |
876ac395 | 522 | if (AtRuntime()) {\r |
523 | Status = EFI_UNSUPPORTED;\r | |
524 | break;\r | |
525 | }\r | |
0c18794e | 526 | ReclaimForOS ();\r |
527 | Status = EFI_SUCCESS;\r | |
528 | break;\r | |
529 | \r | |
530 | case SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE:\r | |
531 | mAtRuntime = TRUE;\r | |
532 | Status = EFI_SUCCESS;\r | |
533 | break;\r | |
534 | \r | |
535 | case SMM_VARIABLE_FUNCTION_GET_STATISTICS:\r | |
536 | VariableInfo = (VARIABLE_INFO_ENTRY *) SmmVariableFunctionHeader->Data;\r | |
537 | InfoSize = *CommBufferSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_HEADER, Data);\r | |
25a4e71a | 538 | \r |
539 | //\r | |
540 | // Do not need to check SmmVariableFunctionHeader->Data in SMRAM here. \r | |
541 | // It is covered by previous CommBuffer check \r | |
542 | //\r | |
543 | \r | |
544 | if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)(UINTN)CommBufferSize, sizeof(UINTN))) {\r | |
545 | DEBUG ((EFI_D_ERROR, "SMM communication buffer size is in SMRAM!\n"));\r | |
546 | Status = EFI_ACCESS_DENIED;\r | |
547 | goto EXIT;\r | |
548 | } \r | |
549 | \r | |
0c18794e | 550 | Status = SmmVariableGetStatistics (VariableInfo, &InfoSize);\r |
551 | *CommBufferSize = InfoSize + OFFSET_OF (SMM_VARIABLE_COMMUNICATE_HEADER, Data);\r | |
552 | break;\r | |
553 | \r | |
554 | default:\r | |
0c18794e | 555 | Status = EFI_UNSUPPORTED;\r |
556 | }\r | |
557 | \r | |
25a4e71a | 558 | EXIT:\r |
0c18794e | 559 | \r |
25a4e71a | 560 | SmmVariableFunctionHeader->ReturnStatus = Status;\r |
0c18794e | 561 | return EFI_SUCCESS;\r |
562 | }\r | |
563 | \r | |
564 | \r | |
565 | /**\r | |
566 | SMM Fault Tolerant Write protocol notification event handler.\r | |
567 | \r | |
568 | Non-Volatile variable write may needs FTW protocol to reclaim when \r | |
569 | writting variable.\r | |
570 | \r | |
571 | @param Protocol Points to the protocol's unique identifier\r | |
572 | @param Interface Points to the interface instance\r | |
573 | @param Handle The handle on which the interface was installed\r | |
574 | \r | |
575 | @retval EFI_SUCCESS SmmEventCallback runs successfully\r | |
576 | @retval EFI_NOT_FOUND The Fvb protocol for variable is not found.\r | |
577 | \r | |
578 | **/\r | |
579 | EFI_STATUS\r | |
580 | EFIAPI\r | |
581 | SmmFtwNotificationEvent (\r | |
582 | IN CONST EFI_GUID *Protocol,\r | |
583 | IN VOID *Interface,\r | |
584 | IN EFI_HANDLE Handle\r | |
585 | )\r | |
586 | {\r | |
587 | EFI_STATUS Status;\r | |
588 | EFI_SMM_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvbProtocol;\r | |
589 | EFI_SMM_FAULT_TOLERANT_WRITE_PROTOCOL *FtwProtocol;\r | |
590 | EFI_PHYSICAL_ADDRESS NvStorageVariableBase;\r | |
591 | \r | |
592 | if (mVariableModuleGlobal->FvbInstance != NULL) {\r | |
593 | return EFI_SUCCESS;\r | |
594 | }\r | |
595 | \r | |
596 | //\r | |
597 | // Ensure SMM FTW protocol is installed.\r | |
598 | //\r | |
599 | Status = GetFtwProtocol ((VOID **)&FtwProtocol);\r | |
600 | if (EFI_ERROR (Status)) {\r | |
601 | return Status;\r | |
602 | }\r | |
603 | \r | |
604 | //\r | |
605 | // Find the proper FVB protocol for variable.\r | |
606 | //\r | |
607 | NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64);\r | |
608 | if (NvStorageVariableBase == 0) {\r | |
609 | NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase);\r | |
610 | }\r | |
611 | Status = GetFvbInfoByAddress (NvStorageVariableBase, NULL, &FvbProtocol);\r | |
612 | if (EFI_ERROR (Status)) {\r | |
613 | return EFI_NOT_FOUND;\r | |
614 | }\r | |
615 | \r | |
616 | mVariableModuleGlobal->FvbInstance = FvbProtocol;\r | |
617 | \r | |
618 | Status = VariableWriteServiceInitialize ();\r | |
619 | ASSERT_EFI_ERROR (Status);\r | |
620 | \r | |
621 | //\r | |
622 | // Notify the variable wrapper driver the variable write service is ready\r | |
623 | //\r | |
624 | Status = gBS->InstallProtocolInterface (\r | |
625 | &mSmmVariableHandle,\r | |
626 | &gSmmVariableWriteGuid,\r | |
627 | EFI_NATIVE_INTERFACE,\r | |
628 | NULL\r | |
629 | );\r | |
630 | ASSERT_EFI_ERROR (Status);\r | |
631 | \r | |
632 | return EFI_SUCCESS;\r | |
633 | }\r | |
634 | \r | |
635 | \r | |
636 | /**\r | |
637 | Variable Driver main entry point. The Variable driver places the 4 EFI\r | |
638 | runtime services in the EFI System Table and installs arch protocols \r | |
639 | for variable read and write services being available. It also registers\r | |
640 | a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
641 | \r | |
642 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
643 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
644 | \r | |
645 | @retval EFI_SUCCESS Variable service successfully initialized.\r | |
646 | \r | |
647 | **/\r | |
648 | EFI_STATUS\r | |
649 | EFIAPI\r | |
650 | VariableServiceInitialize (\r | |
651 | IN EFI_HANDLE ImageHandle,\r | |
652 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
653 | )\r | |
654 | {\r | |
655 | EFI_STATUS Status;\r | |
656 | EFI_HANDLE VariableHandle;\r | |
657 | VOID *SmmFtwRegistration;\r | |
25a4e71a | 658 | EFI_SMM_ACCESS2_PROTOCOL *SmmAccess;\r |
659 | UINTN Size;\r | |
660 | \r | |
0c18794e | 661 | //\r |
662 | // Variable initialize.\r | |
663 | //\r | |
664 | Status = VariableCommonInitialize ();\r | |
665 | ASSERT_EFI_ERROR (Status);\r | |
666 | \r | |
667 | //\r | |
668 | // Install the Smm Variable Protocol on a new handle.\r | |
669 | //\r | |
670 | VariableHandle = NULL;\r | |
671 | Status = gSmst->SmmInstallProtocolInterface (\r | |
672 | &VariableHandle,\r | |
673 | &gEfiSmmVariableProtocolGuid,\r | |
674 | EFI_NATIVE_INTERFACE,\r | |
675 | &gSmmVariable\r | |
676 | );\r | |
677 | ASSERT_EFI_ERROR (Status);\r | |
678 | \r | |
25a4e71a | 679 | //\r |
680 | // Get SMRAM information\r | |
681 | //\r | |
682 | Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&SmmAccess);\r | |
683 | ASSERT_EFI_ERROR (Status);\r | |
684 | \r | |
685 | Size = 0;\r | |
686 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, NULL);\r | |
687 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
688 | \r | |
689 | Status = gSmst->SmmAllocatePool (\r | |
690 | EfiRuntimeServicesData,\r | |
691 | Size,\r | |
692 | (VOID **)&mSmramRanges\r | |
693 | );\r | |
694 | ASSERT_EFI_ERROR (Status);\r | |
695 | \r | |
696 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, mSmramRanges);\r | |
697 | ASSERT_EFI_ERROR (Status);\r | |
698 | \r | |
699 | mSmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR);\r | |
700 | \r | |
0c18794e | 701 | ///\r |
702 | /// Register SMM variable SMI handler\r | |
703 | ///\r | |
704 | VariableHandle = NULL;\r | |
705 | Status = gSmst->SmiHandlerRegister (SmmVariableHandler, &gEfiSmmVariableProtocolGuid, &VariableHandle);\r | |
706 | ASSERT_EFI_ERROR (Status);\r | |
707 | \r | |
708 | //\r | |
709 | // Notify the variable wrapper driver the variable service is ready\r | |
710 | //\r | |
711 | Status = SystemTable->BootServices->InstallProtocolInterface (\r | |
712 | &mVariableHandle,\r | |
713 | &gEfiSmmVariableProtocolGuid,\r | |
714 | EFI_NATIVE_INTERFACE,\r | |
715 | &gSmmVariable\r | |
716 | );\r | |
717 | ASSERT_EFI_ERROR (Status);\r | |
718 | \r | |
719 | //\r | |
720 | // Register FtwNotificationEvent () notify function.\r | |
721 | // \r | |
722 | Status = gSmst->SmmRegisterProtocolNotify (\r | |
723 | &gEfiSmmFaultTolerantWriteProtocolGuid,\r | |
724 | SmmFtwNotificationEvent,\r | |
725 | &SmmFtwRegistration\r | |
726 | );\r | |
727 | ASSERT_EFI_ERROR (Status);\r | |
728 | \r | |
729 | SmmFtwNotificationEvent (NULL, NULL, NULL);\r | |
730 | \r | |
731 | return EFI_SUCCESS;\r | |
732 | }\r | |
733 | \r | |
734 | \r |