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8a2d4996 | 1 | /** @file\r |
2 | \r | |
3 | The sample implementation for SMM variable protocol. And this driver \r | |
4 | implements an SMI handler to communicate with the DXE runtime driver \r | |
5 | to provide variable services.\r | |
6 | \r | |
2445a70e | 7 | Caution: This module requires additional review when modified.\r |
8 | This driver will have external input - variable data and communicate buffer in SMM mode.\r | |
9 | This external input must be validated carefully to avoid security issue like\r | |
10 | buffer overflow, integer overflow.\r | |
11 | \r | |
12 | SmmVariableHandler() will receive untrusted input and do basic validation.\r | |
13 | \r | |
14 | Each sub function VariableServiceGetVariable(), VariableServiceGetNextVariableName(), \r | |
15 | VariableServiceSetVariable(), VariableServiceQueryVariableInfo(), ReclaimForOS(), \r | |
16 | SmmVariableGetStatistics() should also do validation based on its own knowledge.\r | |
17 | \r | |
5e5bb2a9 | 18 | Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>\r |
2445a70e | 19 | This program and the accompanying materials \r |
20 | are licensed and made available under the terms and conditions of the BSD License \r | |
21 | which accompanies this distribution. The full text of the license may be found at \r | |
22 | http://opensource.org/licenses/bsd-license.php\r | |
8a2d4996 | 23 | \r |
24 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
25 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
26 | \r | |
27 | **/\r | |
d00ed85e | 28 | #include <Protocol/SmmVariable.h>\r |
29 | #include <Protocol/SmmFirmwareVolumeBlock.h>\r | |
8a2d4996 | 30 | #include <Protocol/SmmFaultTolerantWrite.h>\r |
2445a70e | 31 | #include <Protocol/SmmAccess2.h>\r |
ff843847 | 32 | #include <Protocol/SmmEndOfDxe.h>\r |
2445a70e | 33 | \r |
8a2d4996 | 34 | #include <Library/SmmServicesTableLib.h>\r |
35 | \r | |
d00ed85e | 36 | #include <Guid/VariableFormat.h>\r |
37 | #include <Guid/SmmVariableCommon.h>\r | |
8a2d4996 | 38 | #include "Variable.h"\r |
8a2d4996 | 39 | \r |
2445a70e | 40 | EFI_SMRAM_DESCRIPTOR *mSmramRanges;\r |
41 | UINTN mSmramRangeCount;\r | |
42 | \r | |
d00ed85e | 43 | extern VARIABLE_INFO_ENTRY *gVariableInfo;\r |
8a2d4996 | 44 | EFI_HANDLE mSmmVariableHandle = NULL;\r |
45 | EFI_HANDLE mVariableHandle = NULL;\r | |
46 | BOOLEAN mAtRuntime = FALSE;\r | |
47 | EFI_GUID mZeroGuid = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}};\r | |
5e5bb2a9 SZ |
48 | UINT8 *mVariableBufferPayload = NULL;\r |
49 | UINTN mVariableBufferPayloadSize;\r | |
ff843847 RN |
50 | extern BOOLEAN mEndOfDxe;\r |
51 | extern BOOLEAN mEnableLocking;\r | |
52 | \r | |
53 | /**\r | |
54 | \r | |
55 | This code sets variable in storage blocks (Volatile or Non-Volatile).\r | |
56 | \r | |
57 | @param VariableName Name of Variable to be found.\r | |
58 | @param VendorGuid Variable vendor GUID.\r | |
59 | @param Attributes Attribute value of the variable found\r | |
60 | @param DataSize Size of Data found. If size is less than the\r | |
61 | data, this value contains the required size.\r | |
62 | @param Data Data pointer.\r | |
63 | \r | |
64 | @return EFI_INVALID_PARAMETER Invalid parameter.\r | |
65 | @return EFI_SUCCESS Set successfully.\r | |
66 | @return EFI_OUT_OF_RESOURCES Resource not enough to set variable.\r | |
67 | @return EFI_NOT_FOUND Not found.\r | |
68 | @return EFI_WRITE_PROTECTED Variable is read-only.\r | |
69 | \r | |
70 | **/\r | |
71 | EFI_STATUS\r | |
72 | EFIAPI\r | |
73 | SmmVariableSetVariable (\r | |
74 | IN CHAR16 *VariableName,\r | |
75 | IN EFI_GUID *VendorGuid,\r | |
76 | IN UINT32 Attributes,\r | |
77 | IN UINTN DataSize,\r | |
78 | IN VOID *Data\r | |
79 | )\r | |
80 | {\r | |
81 | EFI_STATUS Status;\r | |
82 | \r | |
83 | //\r | |
84 | // Disable write protection when the calling SetVariable() through EFI_SMM_VARIABLE_PROTOCOL.\r | |
85 | //\r | |
86 | mEnableLocking = FALSE;\r | |
87 | Status = VariableServiceSetVariable (\r | |
88 | VariableName,\r | |
89 | VendorGuid,\r | |
90 | Attributes,\r | |
91 | DataSize,\r | |
92 | Data\r | |
93 | );\r | |
94 | mEnableLocking = TRUE;\r | |
95 | return Status;\r | |
96 | }\r | |
5e5bb2a9 | 97 | \r |
8a2d4996 | 98 | EFI_SMM_VARIABLE_PROTOCOL gSmmVariable = {\r |
99 | VariableServiceGetVariable,\r | |
100 | VariableServiceGetNextVariableName,\r | |
ff843847 | 101 | SmmVariableSetVariable,\r |
8a2d4996 | 102 | VariableServiceQueryVariableInfo\r |
103 | };\r | |
104 | \r | |
8a2d4996 | 105 | /**\r |
106 | Return TRUE if ExitBootServices () has been called.\r | |
107 | \r | |
108 | @retval TRUE If ExitBootServices () has been called.\r | |
109 | **/\r | |
110 | BOOLEAN\r | |
111 | AtRuntime (\r | |
112 | VOID\r | |
113 | )\r | |
114 | {\r | |
115 | return mAtRuntime;\r | |
116 | }\r | |
117 | \r | |
2445a70e | 118 | /**\r |
119 | This function check if the address is in SMRAM.\r | |
120 | \r | |
121 | @param Buffer the buffer address to be checked.\r | |
122 | @param Length the buffer length to be checked.\r | |
123 | \r | |
124 | @retval TRUE this address is in SMRAM.\r | |
125 | @retval FALSE this address is NOT in SMRAM.\r | |
126 | **/\r | |
127 | BOOLEAN\r | |
128 | InternalIsAddressInSmram (\r | |
129 | IN EFI_PHYSICAL_ADDRESS Buffer,\r | |
130 | IN UINT64 Length\r | |
131 | )\r | |
132 | {\r | |
133 | UINTN Index;\r | |
134 | \r | |
135 | for (Index = 0; Index < mSmramRangeCount; Index ++) {\r | |
136 | if (((Buffer >= mSmramRanges[Index].CpuStart) && (Buffer < mSmramRanges[Index].CpuStart + mSmramRanges[Index].PhysicalSize)) ||\r | |
137 | ((mSmramRanges[Index].CpuStart >= Buffer) && (mSmramRanges[Index].CpuStart < Buffer + Length))) {\r | |
138 | return TRUE;\r | |
139 | }\r | |
140 | }\r | |
141 | \r | |
142 | return FALSE;\r | |
143 | }\r | |
144 | \r | |
9d00d20e SZ |
145 | /**\r |
146 | This function check if the address refered by Buffer and Length is valid.\r | |
147 | \r | |
148 | @param Buffer the buffer address to be checked.\r | |
149 | @param Length the buffer length to be checked.\r | |
150 | \r | |
151 | @retval TRUE this address is valid.\r | |
152 | @retval FALSE this address is NOT valid.\r | |
153 | **/\r | |
154 | BOOLEAN\r | |
155 | InternalIsAddressValid (\r | |
156 | IN UINTN Buffer,\r | |
157 | IN UINTN Length\r | |
158 | )\r | |
159 | {\r | |
160 | if (Buffer > (MAX_ADDRESS - Length)) {\r | |
161 | //\r | |
162 | // Overflow happen\r | |
163 | //\r | |
164 | return FALSE;\r | |
165 | }\r | |
166 | if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)Buffer, (UINT64)Length)) {\r | |
167 | return FALSE;\r | |
168 | }\r | |
169 | return TRUE;\r | |
170 | }\r | |
2445a70e | 171 | \r |
8a2d4996 | 172 | /**\r |
173 | Initializes a basic mutual exclusion lock.\r | |
174 | \r | |
175 | This function initializes a basic mutual exclusion lock to the released state \r | |
176 | and returns the lock. Each lock provides mutual exclusion access at its task \r | |
177 | priority level. Since there is no preemption or multiprocessor support in EFI,\r | |
178 | acquiring the lock only consists of raising to the locks TPL.\r | |
179 | If Lock is NULL, then ASSERT().\r | |
180 | If Priority is not a valid TPL value, then ASSERT().\r | |
181 | \r | |
182 | @param Lock A pointer to the lock data structure to initialize.\r | |
183 | @param Priority EFI TPL is associated with the lock.\r | |
184 | \r | |
185 | @return The lock.\r | |
186 | \r | |
187 | **/\r | |
188 | EFI_LOCK *\r | |
189 | InitializeLock (\r | |
190 | IN OUT EFI_LOCK *Lock,\r | |
191 | IN EFI_TPL Priority\r | |
192 | )\r | |
193 | {\r | |
194 | return Lock;\r | |
195 | }\r | |
196 | \r | |
197 | /**\r | |
198 | Acquires lock only at boot time. Simply returns at runtime.\r | |
199 | \r | |
200 | This is a temperary function that will be removed when\r | |
201 | EfiAcquireLock() in UefiLib can handle the call in UEFI\r | |
202 | Runtimer driver in RT phase.\r | |
203 | It calls EfiAcquireLock() at boot time, and simply returns\r | |
204 | at runtime.\r | |
205 | \r | |
206 | @param Lock A pointer to the lock to acquire.\r | |
207 | \r | |
208 | **/\r | |
209 | VOID\r | |
210 | AcquireLockOnlyAtBootTime (\r | |
211 | IN EFI_LOCK *Lock\r | |
212 | )\r | |
213 | {\r | |
214 | \r | |
215 | }\r | |
216 | \r | |
217 | \r | |
218 | /**\r | |
219 | Releases lock only at boot time. Simply returns at runtime.\r | |
220 | \r | |
221 | This is a temperary function which will be removed when\r | |
222 | EfiReleaseLock() in UefiLib can handle the call in UEFI\r | |
223 | Runtimer driver in RT phase.\r | |
224 | It calls EfiReleaseLock() at boot time and simply returns\r | |
225 | at runtime.\r | |
226 | \r | |
227 | @param Lock A pointer to the lock to release.\r | |
228 | \r | |
229 | **/\r | |
230 | VOID\r | |
231 | ReleaseLockOnlyAtBootTime (\r | |
232 | IN EFI_LOCK *Lock\r | |
233 | )\r | |
234 | {\r | |
235 | \r | |
236 | }\r | |
237 | \r | |
238 | /**\r | |
239 | Retrive the SMM Fault Tolerent Write protocol interface.\r | |
240 | \r | |
241 | @param[out] FtwProtocol The interface of SMM Ftw protocol\r | |
242 | \r | |
243 | @retval EFI_SUCCESS The SMM FTW protocol instance was found and returned in FtwProtocol.\r | |
244 | @retval EFI_NOT_FOUND The SMM FTW protocol instance was not found.\r | |
245 | @retval EFI_INVALID_PARAMETER SarProtocol is NULL.\r | |
246 | \r | |
247 | **/\r | |
248 | EFI_STATUS\r | |
249 | GetFtwProtocol (\r | |
250 | OUT VOID **FtwProtocol\r | |
251 | )\r | |
252 | {\r | |
253 | EFI_STATUS Status;\r | |
254 | \r | |
255 | //\r | |
256 | // Locate Smm Fault Tolerent Write protocol\r | |
257 | //\r | |
258 | Status = gSmst->SmmLocateProtocol (\r | |
259 | &gEfiSmmFaultTolerantWriteProtocolGuid, \r | |
260 | NULL, \r | |
261 | FtwProtocol\r | |
262 | );\r | |
263 | return Status;\r | |
264 | }\r | |
265 | \r | |
266 | \r | |
267 | /**\r | |
268 | Retrive the SMM FVB protocol interface by HANDLE.\r | |
269 | \r | |
270 | @param[in] FvBlockHandle The handle of SMM FVB protocol that provides services for\r | |
271 | reading, writing, and erasing the target block.\r | |
272 | @param[out] FvBlock The interface of SMM FVB protocol\r | |
273 | \r | |
274 | @retval EFI_SUCCESS The interface information for the specified protocol was returned.\r | |
275 | @retval EFI_UNSUPPORTED The device does not support the SMM FVB protocol.\r | |
276 | @retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL.\r | |
277 | \r | |
278 | **/\r | |
279 | EFI_STATUS\r | |
280 | GetFvbByHandle (\r | |
281 | IN EFI_HANDLE FvBlockHandle,\r | |
282 | OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock\r | |
283 | )\r | |
284 | {\r | |
285 | //\r | |
286 | // To get the SMM FVB protocol interface on the handle\r | |
287 | //\r | |
288 | return gSmst->SmmHandleProtocol (\r | |
289 | FvBlockHandle,\r | |
290 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
291 | (VOID **) FvBlock\r | |
292 | );\r | |
293 | }\r | |
294 | \r | |
295 | \r | |
296 | /**\r | |
297 | Function returns an array of handles that support the SMM FVB protocol\r | |
298 | in a buffer allocated from pool. \r | |
299 | \r | |
300 | @param[out] NumberHandles The number of handles returned in Buffer.\r | |
301 | @param[out] Buffer A pointer to the buffer to return the requested\r | |
302 | array of handles that support SMM FVB protocol.\r | |
303 | \r | |
304 | @retval EFI_SUCCESS The array of handles was returned in Buffer, and the number of\r | |
305 | handles in Buffer was returned in NumberHandles.\r | |
306 | @retval EFI_NOT_FOUND No SMM FVB handle was found.\r | |
307 | @retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results.\r | |
308 | @retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL.\r | |
309 | \r | |
310 | **/\r | |
311 | EFI_STATUS\r | |
312 | GetFvbCountAndBuffer (\r | |
313 | OUT UINTN *NumberHandles,\r | |
314 | OUT EFI_HANDLE **Buffer\r | |
315 | )\r | |
316 | {\r | |
317 | EFI_STATUS Status;\r | |
318 | UINTN BufferSize;\r | |
319 | \r | |
320 | if ((NumberHandles == NULL) || (Buffer == NULL)) {\r | |
321 | return EFI_INVALID_PARAMETER;\r | |
322 | }\r | |
323 | \r | |
324 | BufferSize = 0;\r | |
325 | *NumberHandles = 0;\r | |
326 | *Buffer = NULL;\r | |
327 | Status = gSmst->SmmLocateHandle (\r | |
328 | ByProtocol,\r | |
329 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
330 | NULL,\r | |
331 | &BufferSize,\r | |
332 | *Buffer\r | |
333 | );\r | |
334 | if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {\r | |
335 | return EFI_NOT_FOUND;\r | |
336 | }\r | |
337 | \r | |
338 | *Buffer = AllocatePool (BufferSize);\r | |
339 | if (*Buffer == NULL) {\r | |
340 | return EFI_OUT_OF_RESOURCES;\r | |
341 | }\r | |
342 | \r | |
343 | Status = gSmst->SmmLocateHandle (\r | |
344 | ByProtocol,\r | |
345 | &gEfiSmmFirmwareVolumeBlockProtocolGuid,\r | |
346 | NULL,\r | |
347 | &BufferSize,\r | |
348 | *Buffer\r | |
349 | );\r | |
350 | \r | |
351 | *NumberHandles = BufferSize / sizeof(EFI_HANDLE);\r | |
352 | if (EFI_ERROR(Status)) {\r | |
353 | *NumberHandles = 0;\r | |
5e5bb2a9 SZ |
354 | FreePool (*Buffer);\r |
355 | *Buffer = NULL;\r | |
8a2d4996 | 356 | }\r |
357 | \r | |
358 | return Status;\r | |
359 | }\r | |
360 | \r | |
361 | \r | |
362 | /**\r | |
363 | Get the variable statistics information from the information buffer pointed by gVariableInfo.\r | |
364 | \r | |
2445a70e | 365 | Caution: This function may be invoked at SMM runtime.\r |
366 | InfoEntry and InfoSize are external input. Care must be taken to make sure not security issue at runtime.\r | |
367 | \r | |
368 | @param[in, out] InfoEntry A pointer to the buffer of variable information entry.\r | |
369 | On input, point to the variable information returned last time. if \r | |
370 | InfoEntry->VendorGuid is zero, return the first information.\r | |
371 | On output, point to the next variable information.\r | |
372 | @param[in, out] InfoSize On input, the size of the variable information buffer.\r | |
373 | On output, the returned variable information size.\r | |
8a2d4996 | 374 | \r |
375 | @retval EFI_SUCCESS The variable information is found and returned successfully.\r | |
376 | @retval EFI_UNSUPPORTED No variable inoformation exists in variable driver. The \r | |
377 | PcdVariableCollectStatistics should be set TRUE to support it.\r | |
378 | @retval EFI_BUFFER_TOO_SMALL The buffer is too small to hold the next variable information.\r | |
379 | \r | |
380 | **/\r | |
381 | EFI_STATUS\r | |
382 | SmmVariableGetStatistics (\r | |
d00ed85e | 383 | IN OUT VARIABLE_INFO_ENTRY *InfoEntry,\r |
8a2d4996 | 384 | IN OUT UINTN *InfoSize\r |
385 | )\r | |
386 | {\r | |
d00ed85e | 387 | VARIABLE_INFO_ENTRY *VariableInfo;\r |
8a2d4996 | 388 | UINTN NameLength;\r |
389 | UINTN StatisticsInfoSize;\r | |
390 | CHAR16 *InfoName;\r | |
5e5bb2a9 SZ |
391 | EFI_GUID VendorGuid;\r |
392 | \r | |
8a2d4996 | 393 | ASSERT (InfoEntry != NULL);\r |
394 | VariableInfo = gVariableInfo; \r | |
395 | if (VariableInfo == NULL) {\r | |
396 | return EFI_UNSUPPORTED;\r | |
397 | }\r | |
398 | \r | |
d00ed85e | 399 | StatisticsInfoSize = sizeof (VARIABLE_INFO_ENTRY) + StrSize (VariableInfo->Name);\r |
eb96e4f2 | 400 | if (*InfoSize < StatisticsInfoSize) {\r |
8a2d4996 | 401 | *InfoSize = StatisticsInfoSize;\r |
402 | return EFI_BUFFER_TOO_SMALL;\r | |
403 | }\r | |
404 | InfoName = (CHAR16 *)(InfoEntry + 1);\r | |
405 | \r | |
5e5bb2a9 SZ |
406 | CopyGuid (&VendorGuid, &InfoEntry->VendorGuid);\r |
407 | \r | |
408 | if (CompareGuid (&VendorGuid, &mZeroGuid)) {\r | |
8a2d4996 | 409 | //\r |
410 | // Return the first variable info\r | |
411 | //\r | |
d00ed85e | 412 | CopyMem (InfoEntry, VariableInfo, sizeof (VARIABLE_INFO_ENTRY));\r |
8a2d4996 | 413 | CopyMem (InfoName, VariableInfo->Name, StrSize (VariableInfo->Name));\r |
414 | *InfoSize = StatisticsInfoSize;\r | |
415 | return EFI_SUCCESS;\r | |
416 | }\r | |
417 | \r | |
418 | //\r | |
419 | // Get the next variable info\r | |
420 | //\r | |
421 | while (VariableInfo != NULL) {\r | |
5e5bb2a9 | 422 | if (CompareGuid (&VariableInfo->VendorGuid, &VendorGuid)) {\r |
8a2d4996 | 423 | NameLength = StrSize (VariableInfo->Name);\r |
424 | if (NameLength == StrSize (InfoName)) {\r | |
425 | if (CompareMem (VariableInfo->Name, InfoName, NameLength) == 0) {\r | |
426 | //\r | |
427 | // Find the match one\r | |
428 | //\r | |
429 | VariableInfo = VariableInfo->Next;\r | |
430 | break;\r | |
431 | }\r | |
432 | }\r | |
433 | }\r | |
434 | VariableInfo = VariableInfo->Next;\r | |
435 | };\r | |
436 | \r | |
437 | if (VariableInfo == NULL) {\r | |
438 | *InfoSize = 0;\r | |
439 | return EFI_SUCCESS;\r | |
440 | }\r | |
441 | \r | |
442 | //\r | |
443 | // Output the new variable info\r | |
444 | //\r | |
d00ed85e | 445 | StatisticsInfoSize = sizeof (VARIABLE_INFO_ENTRY) + StrSize (VariableInfo->Name);\r |
8a2d4996 | 446 | if (*InfoSize < StatisticsInfoSize) {\r |
447 | *InfoSize = StatisticsInfoSize;\r | |
448 | return EFI_BUFFER_TOO_SMALL;\r | |
449 | }\r | |
450 | \r | |
d00ed85e | 451 | CopyMem (InfoEntry, VariableInfo, sizeof (VARIABLE_INFO_ENTRY));\r |
8a2d4996 | 452 | CopyMem (InfoName, VariableInfo->Name, StrSize (VariableInfo->Name));\r |
453 | *InfoSize = StatisticsInfoSize;\r | |
454 | \r | |
455 | return EFI_SUCCESS;\r | |
456 | }\r | |
457 | \r | |
458 | \r | |
459 | /**\r | |
460 | Communication service SMI Handler entry.\r | |
461 | \r | |
462 | This SMI handler provides services for the variable wrapper driver.\r | |
463 | \r | |
2445a70e | 464 | Caution: This function may receive untrusted input.\r |
465 | This variable data and communicate buffer are external input, so this function will do basic validation.\r | |
466 | Each sub function VariableServiceGetVariable(), VariableServiceGetNextVariableName(), \r | |
467 | VariableServiceSetVariable(), VariableServiceQueryVariableInfo(), ReclaimForOS(), \r | |
468 | SmmVariableGetStatistics() should also do validation based on its own knowledge.\r | |
469 | \r | |
8a2d4996 | 470 | @param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().\r |
471 | @param[in] RegisterContext Points to an optional handler context which was specified when the\r | |
472 | handler was registered.\r | |
473 | @param[in, out] CommBuffer A pointer to a collection of data in memory that will\r | |
474 | be conveyed from a non-SMM environment into an SMM environment.\r | |
475 | @param[in, out] CommBufferSize The size of the CommBuffer.\r | |
476 | \r | |
477 | @retval EFI_SUCCESS The interrupt was handled and quiesced. No other handlers \r | |
478 | should still be called.\r | |
479 | @retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other handlers should \r | |
480 | still be called.\r | |
481 | @retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other handlers should still \r | |
482 | be called.\r | |
483 | @retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.\r | |
484 | **/\r | |
485 | EFI_STATUS\r | |
486 | EFIAPI\r | |
487 | SmmVariableHandler (\r | |
488 | IN EFI_HANDLE DispatchHandle,\r | |
489 | IN CONST VOID *RegisterContext,\r | |
490 | IN OUT VOID *CommBuffer,\r | |
491 | IN OUT UINTN *CommBufferSize\r | |
492 | )\r | |
493 | {\r | |
494 | EFI_STATUS Status;\r | |
495 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader;\r | |
496 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
497 | SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *GetNextVariableName;\r | |
498 | SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *QueryVariableInfo;\r | |
d00ed85e | 499 | VARIABLE_INFO_ENTRY *VariableInfo;\r |
ff843847 | 500 | SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *VariableToLock;\r |
8a2d4996 | 501 | UINTN InfoSize;\r |
9d00d20e | 502 | UINTN NameBufferSize;\r |
5e5bb2a9 | 503 | UINTN CommBufferPayloadSize;\r |
164a9b67 | 504 | UINTN TempCommBufferSize;\r |
8a2d4996 | 505 | \r |
2445a70e | 506 | //\r |
507 | // If input is invalid, stop processing this SMI\r | |
508 | //\r | |
509 | if (CommBuffer == NULL || CommBufferSize == NULL) {\r | |
510 | return EFI_SUCCESS;\r | |
511 | }\r | |
512 | \r | |
164a9b67 SZ |
513 | TempCommBufferSize = *CommBufferSize;\r |
514 | \r | |
515 | if (TempCommBufferSize < SMM_VARIABLE_COMMUNICATE_HEADER_SIZE) {\r | |
5e5bb2a9 SZ |
516 | DEBUG ((EFI_D_ERROR, "SmmVariableHandler: SMM communication buffer size invalid!\n"));\r |
517 | return EFI_SUCCESS;\r | |
518 | }\r | |
164a9b67 | 519 | CommBufferPayloadSize = TempCommBufferSize - SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r |
5e5bb2a9 SZ |
520 | if (CommBufferPayloadSize > mVariableBufferPayloadSize) {\r |
521 | DEBUG ((EFI_D_ERROR, "SmmVariableHandler: SMM communication buffer payload size invalid!\n"));\r | |
2445a70e | 522 | return EFI_SUCCESS;\r |
523 | }\r | |
524 | \r | |
164a9b67 | 525 | if (!InternalIsAddressValid ((UINTN)CommBuffer, TempCommBufferSize)) {\r |
5e5bb2a9 | 526 | DEBUG ((EFI_D_ERROR, "SmmVariableHandler: SMM communication buffer in SMRAM or overflow!\n"));\r |
2445a70e | 527 | return EFI_SUCCESS;\r |
528 | }\r | |
8a2d4996 | 529 | \r |
530 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *)CommBuffer;\r | |
531 | switch (SmmVariableFunctionHeader->Function) {\r | |
532 | case SMM_VARIABLE_FUNCTION_GET_VARIABLE:\r | |
5e5bb2a9 SZ |
533 | if (CommBufferPayloadSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) {\r |
534 | DEBUG ((EFI_D_ERROR, "GetVariable: SMM communication buffer size invalid!\n"));\r | |
535 | return EFI_SUCCESS;\r | |
536 | }\r | |
537 | //\r | |
538 | // Copy the input communicate buffer payload to pre-allocated SMM variable buffer payload.\r | |
539 | //\r | |
540 | CopyMem (mVariableBufferPayload, SmmVariableFunctionHeader->Data, CommBufferPayloadSize);\r | |
541 | SmmVariableHeader = (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *) mVariableBufferPayload;\r | |
9d00d20e SZ |
542 | if (((UINTN)(~0) - SmmVariableHeader->DataSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) ||\r |
543 | ((UINTN)(~0) - SmmVariableHeader->NameSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + SmmVariableHeader->DataSize)) {\r | |
544 | //\r | |
545 | // Prevent InfoSize overflow happen\r | |
546 | //\r | |
547 | Status = EFI_ACCESS_DENIED;\r | |
548 | goto EXIT;\r | |
549 | }\r | |
2445a70e | 550 | InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) \r |
551 | + SmmVariableHeader->DataSize + SmmVariableHeader->NameSize;\r | |
552 | \r | |
553 | //\r | |
554 | // SMRAM range check already covered before\r | |
555 | //\r | |
5e5bb2a9 SZ |
556 | if (InfoSize > CommBufferPayloadSize) {\r |
557 | DEBUG ((EFI_D_ERROR, "GetVariable: Data size exceed communication buffer size limit!\n"));\r | |
2445a70e | 558 | Status = EFI_ACCESS_DENIED;\r |
559 | goto EXIT;\r | |
560 | }\r | |
561 | \r | |
9d00d20e SZ |
562 | if (SmmVariableHeader->NameSize < sizeof (CHAR16) || SmmVariableHeader->Name[SmmVariableHeader->NameSize/sizeof (CHAR16) - 1] != L'\0') {\r |
563 | //\r | |
564 | // Make sure VariableName is A Null-terminated string.\r | |
565 | //\r | |
566 | Status = EFI_ACCESS_DENIED;\r | |
567 | goto EXIT;\r | |
568 | }\r | |
569 | \r | |
8a2d4996 | 570 | Status = VariableServiceGetVariable (\r |
571 | SmmVariableHeader->Name,\r | |
572 | &SmmVariableHeader->Guid,\r | |
573 | &SmmVariableHeader->Attributes,\r | |
574 | &SmmVariableHeader->DataSize,\r | |
575 | (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize\r | |
576 | );\r | |
5e5bb2a9 | 577 | CopyMem (SmmVariableFunctionHeader->Data, mVariableBufferPayload, CommBufferPayloadSize);\r |
8a2d4996 | 578 | break;\r |
579 | \r | |
580 | case SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME:\r | |
5e5bb2a9 SZ |
581 | if (CommBufferPayloadSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
582 | DEBUG ((EFI_D_ERROR, "GetNextVariableName: SMM communication buffer size invalid!\n"));\r | |
583 | return EFI_SUCCESS;\r | |
584 | }\r | |
585 | //\r | |
586 | // Copy the input communicate buffer payload to pre-allocated SMM variable buffer payload.\r | |
587 | //\r | |
588 | CopyMem (mVariableBufferPayload, SmmVariableFunctionHeader->Data, CommBufferPayloadSize);\r | |
589 | GetNextVariableName = (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *) mVariableBufferPayload;\r | |
9d00d20e SZ |
590 | if ((UINTN)(~0) - GetNextVariableName->NameSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
591 | //\r | |
592 | // Prevent InfoSize overflow happen\r | |
593 | //\r | |
594 | Status = EFI_ACCESS_DENIED;\r | |
595 | goto EXIT;\r | |
596 | }\r | |
2445a70e | 597 | InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + GetNextVariableName->NameSize;\r |
598 | \r | |
599 | //\r | |
600 | // SMRAM range check already covered before\r | |
601 | //\r | |
5e5bb2a9 SZ |
602 | if (InfoSize > CommBufferPayloadSize) {\r |
603 | DEBUG ((EFI_D_ERROR, "GetNextVariableName: Data size exceed communication buffer size limit!\n"));\r | |
2445a70e | 604 | Status = EFI_ACCESS_DENIED;\r |
605 | goto EXIT;\r | |
606 | }\r | |
607 | \r | |
5e5bb2a9 | 608 | NameBufferSize = CommBufferPayloadSize - OFFSET_OF(SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name);\r |
9d00d20e SZ |
609 | if (NameBufferSize < sizeof (CHAR16) || GetNextVariableName->Name[NameBufferSize/sizeof (CHAR16) - 1] != L'\0') {\r |
610 | //\r | |
611 | // Make sure input VariableName is A Null-terminated string.\r | |
612 | //\r | |
613 | Status = EFI_ACCESS_DENIED;\r | |
614 | goto EXIT;\r | |
615 | }\r | |
616 | \r | |
8a2d4996 | 617 | Status = VariableServiceGetNextVariableName (\r |
618 | &GetNextVariableName->NameSize,\r | |
619 | GetNextVariableName->Name,\r | |
620 | &GetNextVariableName->Guid\r | |
621 | );\r | |
5e5bb2a9 | 622 | CopyMem (SmmVariableFunctionHeader->Data, mVariableBufferPayload, CommBufferPayloadSize);\r |
8a2d4996 | 623 | break;\r |
624 | \r | |
625 | case SMM_VARIABLE_FUNCTION_SET_VARIABLE:\r | |
5e5bb2a9 SZ |
626 | if (CommBufferPayloadSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) {\r |
627 | DEBUG ((EFI_D_ERROR, "SetVariable: SMM communication buffer size invalid!\n"));\r | |
628 | return EFI_SUCCESS;\r | |
629 | }\r | |
630 | //\r | |
631 | // Copy the input communicate buffer payload to pre-allocated SMM variable buffer payload.\r | |
632 | //\r | |
633 | CopyMem (mVariableBufferPayload, SmmVariableFunctionHeader->Data, CommBufferPayloadSize);\r | |
634 | SmmVariableHeader = (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *) mVariableBufferPayload;\r | |
9d00d20e SZ |
635 | if (((UINTN)(~0) - SmmVariableHeader->DataSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) ||\r |
636 | ((UINTN)(~0) - SmmVariableHeader->NameSize < OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + SmmVariableHeader->DataSize)) {\r | |
637 | //\r | |
638 | // Prevent InfoSize overflow happen\r | |
639 | //\r | |
640 | Status = EFI_ACCESS_DENIED;\r | |
641 | goto EXIT;\r | |
642 | }\r | |
d17c4eac | 643 | InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)\r |
644 | + SmmVariableHeader->DataSize + SmmVariableHeader->NameSize;\r | |
645 | \r | |
646 | //\r | |
647 | // SMRAM range check already covered before\r | |
648 | // Data buffer should not contain SMM range\r | |
649 | //\r | |
5e5bb2a9 SZ |
650 | if (InfoSize > CommBufferPayloadSize) {\r |
651 | DEBUG ((EFI_D_ERROR, "SetVariable: Data size exceed communication buffer size limit!\n"));\r | |
d17c4eac | 652 | Status = EFI_ACCESS_DENIED;\r |
653 | goto EXIT;\r | |
654 | }\r | |
655 | \r | |
9d00d20e SZ |
656 | if (SmmVariableHeader->NameSize < sizeof (CHAR16) || SmmVariableHeader->Name[SmmVariableHeader->NameSize/sizeof (CHAR16) - 1] != L'\0') {\r |
657 | //\r | |
658 | // Make sure VariableName is A Null-terminated string.\r | |
659 | //\r | |
660 | Status = EFI_ACCESS_DENIED;\r | |
661 | goto EXIT;\r | |
662 | }\r | |
663 | \r | |
8a2d4996 | 664 | Status = VariableServiceSetVariable (\r |
665 | SmmVariableHeader->Name,\r | |
666 | &SmmVariableHeader->Guid,\r | |
667 | SmmVariableHeader->Attributes,\r | |
668 | SmmVariableHeader->DataSize,\r | |
669 | (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize\r | |
670 | );\r | |
671 | break;\r | |
672 | \r | |
673 | case SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO:\r | |
5e5bb2a9 SZ |
674 | if (CommBufferPayloadSize < sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO)) {\r |
675 | DEBUG ((EFI_D_ERROR, "QueryVariableInfo: SMM communication buffer size invalid!\n"));\r | |
676 | return EFI_SUCCESS;\r | |
2445a70e | 677 | }\r |
5e5bb2a9 | 678 | QueryVariableInfo = (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *) SmmVariableFunctionHeader->Data;\r |
2445a70e | 679 | \r |
8a2d4996 | 680 | Status = VariableServiceQueryVariableInfo (\r |
681 | QueryVariableInfo->Attributes,\r | |
682 | &QueryVariableInfo->MaximumVariableStorageSize,\r | |
683 | &QueryVariableInfo->RemainingVariableStorageSize,\r | |
684 | &QueryVariableInfo->MaximumVariableSize\r | |
685 | );\r | |
686 | break;\r | |
687 | \r | |
688 | case SMM_VARIABLE_FUNCTION_READY_TO_BOOT:\r | |
ff843847 | 689 | mEndOfDxe = TRUE;\r |
876ac395 | 690 | if (AtRuntime()) {\r |
691 | Status = EFI_UNSUPPORTED;\r | |
692 | break;\r | |
693 | }\r | |
8a2d4996 | 694 | ReclaimForOS ();\r |
695 | Status = EFI_SUCCESS;\r | |
696 | break;\r | |
697 | \r | |
698 | case SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE:\r | |
699 | mAtRuntime = TRUE;\r | |
700 | Status = EFI_SUCCESS;\r | |
701 | break;\r | |
702 | \r | |
703 | case SMM_VARIABLE_FUNCTION_GET_STATISTICS:\r | |
d00ed85e | 704 | VariableInfo = (VARIABLE_INFO_ENTRY *) SmmVariableFunctionHeader->Data;\r |
164a9b67 | 705 | InfoSize = TempCommBufferSize - SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r |
2445a70e | 706 | \r |
707 | //\r | |
708 | // Do not need to check SmmVariableFunctionHeader->Data in SMRAM here. \r | |
709 | // It is covered by previous CommBuffer check \r | |
710 | //\r | |
711 | \r | |
712 | if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)(UINTN)CommBufferSize, sizeof(UINTN))) {\r | |
5e5bb2a9 | 713 | DEBUG ((EFI_D_ERROR, "GetStatistics: SMM communication buffer in SMRAM!\n"));\r |
2445a70e | 714 | Status = EFI_ACCESS_DENIED;\r |
715 | goto EXIT;\r | |
716 | } \r | |
717 | \r | |
8a2d4996 | 718 | Status = SmmVariableGetStatistics (VariableInfo, &InfoSize);\r |
3f5c168f | 719 | *CommBufferSize = InfoSize + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r |
8a2d4996 | 720 | break;\r |
721 | \r | |
ff843847 | 722 | case SMM_VARIABLE_FUNCTION_LOCK_VARIABLE:\r |
51547bb8 | 723 | if (mEndOfDxe) {\r |
ff843847 | 724 | Status = EFI_ACCESS_DENIED;\r |
51547bb8 RN |
725 | } else {\r |
726 | VariableToLock = (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *) SmmVariableFunctionHeader->Data;\r | |
727 | Status = VariableLockRequestToLock (\r | |
728 | NULL,\r | |
729 | VariableToLock->Name,\r | |
730 | &VariableToLock->Guid\r | |
731 | );\r | |
ff843847 | 732 | }\r |
ff843847 RN |
733 | break;\r |
734 | \r | |
8a2d4996 | 735 | default:\r |
8a2d4996 | 736 | Status = EFI_UNSUPPORTED;\r |
737 | }\r | |
738 | \r | |
2445a70e | 739 | EXIT:\r |
740 | \r | |
8a2d4996 | 741 | SmmVariableFunctionHeader->ReturnStatus = Status;\r |
742 | \r | |
743 | return EFI_SUCCESS;\r | |
744 | }\r | |
745 | \r | |
ff843847 RN |
746 | /**\r |
747 | SMM END_OF_DXE protocol notification event handler.\r | |
748 | \r | |
749 | @param Protocol Points to the protocol's unique identifier\r | |
750 | @param Interface Points to the interface instance\r | |
751 | @param Handle The handle on which the interface was installed\r | |
752 | \r | |
753 | @retval EFI_SUCCESS SmmEndOfDxeCallback runs successfully\r | |
754 | \r | |
755 | **/\r | |
756 | EFI_STATUS\r | |
757 | EFIAPI\r | |
758 | SmmEndOfDxeCallback (\r | |
759 | IN CONST EFI_GUID *Protocol,\r | |
760 | IN VOID *Interface,\r | |
761 | IN EFI_HANDLE Handle\r | |
762 | )\r | |
763 | {\r | |
764 | DEBUG ((EFI_D_INFO, "[Variable]END_OF_DXE is signaled\n"));\r | |
765 | mEndOfDxe = TRUE;\r | |
766 | return EFI_SUCCESS;\r | |
767 | }\r | |
8a2d4996 | 768 | \r |
769 | /**\r | |
770 | SMM Fault Tolerant Write protocol notification event handler.\r | |
771 | \r | |
772 | Non-Volatile variable write may needs FTW protocol to reclaim when \r | |
773 | writting variable.\r | |
774 | \r | |
775 | @param Protocol Points to the protocol's unique identifier\r | |
776 | @param Interface Points to the interface instance\r | |
777 | @param Handle The handle on which the interface was installed\r | |
778 | \r | |
779 | @retval EFI_SUCCESS SmmEventCallback runs successfully\r | |
780 | @retval EFI_NOT_FOUND The Fvb protocol for variable is not found.\r | |
781 | \r | |
782 | **/\r | |
783 | EFI_STATUS\r | |
784 | EFIAPI\r | |
785 | SmmFtwNotificationEvent (\r | |
786 | IN CONST EFI_GUID *Protocol,\r | |
787 | IN VOID *Interface,\r | |
788 | IN EFI_HANDLE Handle\r | |
789 | )\r | |
790 | {\r | |
791 | EFI_STATUS Status;\r | |
792 | EFI_SMM_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvbProtocol;\r | |
793 | EFI_SMM_FAULT_TOLERANT_WRITE_PROTOCOL *FtwProtocol;\r | |
794 | EFI_PHYSICAL_ADDRESS NvStorageVariableBase;\r | |
795 | \r | |
796 | if (mVariableModuleGlobal->FvbInstance != NULL) {\r | |
797 | return EFI_SUCCESS;\r | |
798 | }\r | |
799 | \r | |
800 | //\r | |
801 | // Ensure SMM FTW protocol is installed.\r | |
802 | //\r | |
5c7fa429 | 803 | Status = GetFtwProtocol ((VOID **)&FtwProtocol);\r |
8a2d4996 | 804 | if (EFI_ERROR (Status)) {\r |
805 | return Status;\r | |
806 | }\r | |
807 | \r | |
808 | //\r | |
809 | // Find the proper FVB protocol for variable.\r | |
810 | //\r | |
811 | NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64);\r | |
812 | if (NvStorageVariableBase == 0) {\r | |
813 | NvStorageVariableBase = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase);\r | |
814 | }\r | |
815 | Status = GetFvbInfoByAddress (NvStorageVariableBase, NULL, &FvbProtocol);\r | |
816 | if (EFI_ERROR (Status)) {\r | |
817 | return EFI_NOT_FOUND;\r | |
818 | }\r | |
819 | \r | |
820 | mVariableModuleGlobal->FvbInstance = FvbProtocol;\r | |
821 | \r | |
822 | Status = VariableWriteServiceInitialize ();\r | |
823 | ASSERT_EFI_ERROR (Status);\r | |
824 | \r | |
825 | //\r | |
826 | // Notify the variable wrapper driver the variable write service is ready\r | |
827 | //\r | |
828 | Status = gBS->InstallProtocolInterface (\r | |
829 | &mSmmVariableHandle,\r | |
d00ed85e | 830 | &gSmmVariableWriteGuid,\r |
8a2d4996 | 831 | EFI_NATIVE_INTERFACE,\r |
832 | NULL\r | |
833 | );\r | |
834 | ASSERT_EFI_ERROR (Status);\r | |
835 | \r | |
836 | return EFI_SUCCESS;\r | |
837 | }\r | |
838 | \r | |
839 | \r | |
840 | /**\r | |
841 | Variable Driver main entry point. The Variable driver places the 4 EFI\r | |
842 | runtime services in the EFI System Table and installs arch protocols \r | |
d00ed85e | 843 | for variable read and write services being available. It also registers\r |
8a2d4996 | 844 | a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r |
845 | \r | |
846 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
847 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
848 | \r | |
849 | @retval EFI_SUCCESS Variable service successfully initialized.\r | |
850 | \r | |
851 | **/\r | |
852 | EFI_STATUS\r | |
853 | EFIAPI\r | |
854 | VariableServiceInitialize (\r | |
855 | IN EFI_HANDLE ImageHandle,\r | |
856 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
857 | )\r | |
858 | {\r | |
859 | EFI_STATUS Status;\r | |
860 | EFI_HANDLE VariableHandle;\r | |
861 | VOID *SmmFtwRegistration;\r | |
2445a70e | 862 | EFI_SMM_ACCESS2_PROTOCOL *SmmAccess;\r |
863 | UINTN Size;\r | |
ff843847 | 864 | VOID *SmmEndOfDxeRegistration;\r |
2445a70e | 865 | \r |
8a2d4996 | 866 | //\r |
867 | // Variable initialize.\r | |
868 | //\r | |
869 | Status = VariableCommonInitialize ();\r | |
870 | ASSERT_EFI_ERROR (Status);\r | |
871 | \r | |
872 | //\r | |
873 | // Install the Smm Variable Protocol on a new handle.\r | |
874 | //\r | |
875 | VariableHandle = NULL;\r | |
876 | Status = gSmst->SmmInstallProtocolInterface (\r | |
877 | &VariableHandle,\r | |
878 | &gEfiSmmVariableProtocolGuid,\r | |
879 | EFI_NATIVE_INTERFACE,\r | |
880 | &gSmmVariable\r | |
881 | );\r | |
882 | ASSERT_EFI_ERROR (Status);\r | |
883 | \r | |
2445a70e | 884 | //\r |
885 | // Get SMRAM information\r | |
886 | //\r | |
887 | Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&SmmAccess);\r | |
888 | ASSERT_EFI_ERROR (Status);\r | |
889 | \r | |
890 | Size = 0;\r | |
891 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, NULL);\r | |
892 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
893 | \r | |
894 | Status = gSmst->SmmAllocatePool (\r | |
895 | EfiRuntimeServicesData,\r | |
896 | Size,\r | |
897 | (VOID **)&mSmramRanges\r | |
898 | );\r | |
899 | ASSERT_EFI_ERROR (Status);\r | |
900 | \r | |
901 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, mSmramRanges);\r | |
902 | ASSERT_EFI_ERROR (Status);\r | |
903 | \r | |
904 | mSmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR);\r | |
905 | \r | |
5e5bb2a9 SZ |
906 | mVariableBufferPayloadSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize)) +\r |
907 | OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - sizeof (VARIABLE_HEADER);\r | |
908 | \r | |
909 | Status = gSmst->SmmAllocatePool (\r | |
910 | EfiRuntimeServicesData,\r | |
911 | mVariableBufferPayloadSize,\r | |
912 | (VOID **)&mVariableBufferPayload\r | |
913 | );\r | |
914 | ASSERT_EFI_ERROR (Status);\r | |
915 | \r | |
8a2d4996 | 916 | ///\r |
917 | /// Register SMM variable SMI handler\r | |
918 | ///\r | |
919 | VariableHandle = NULL;\r | |
920 | Status = gSmst->SmiHandlerRegister (SmmVariableHandler, &gEfiSmmVariableProtocolGuid, &VariableHandle);\r | |
921 | ASSERT_EFI_ERROR (Status);\r | |
922 | \r | |
923 | //\r | |
924 | // Notify the variable wrapper driver the variable service is ready\r | |
925 | //\r | |
926 | Status = SystemTable->BootServices->InstallProtocolInterface (\r | |
927 | &mVariableHandle,\r | |
928 | &gEfiSmmVariableProtocolGuid,\r | |
929 | EFI_NATIVE_INTERFACE,\r | |
930 | &gSmmVariable\r | |
931 | );\r | |
932 | ASSERT_EFI_ERROR (Status);\r | |
933 | \r | |
ff843847 RN |
934 | //\r |
935 | // Register EFI_SMM_END_OF_DXE_PROTOCOL_GUID notify function.\r | |
936 | //\r | |
937 | Status = gSmst->SmmRegisterProtocolNotify (\r | |
938 | &gEfiSmmEndOfDxeProtocolGuid,\r | |
939 | SmmEndOfDxeCallback,\r | |
940 | &SmmEndOfDxeRegistration\r | |
941 | );\r | |
942 | ASSERT_EFI_ERROR (Status);\r | |
943 | \r | |
8a2d4996 | 944 | //\r |
945 | // Register FtwNotificationEvent () notify function.\r | |
946 | // \r | |
947 | Status = gSmst->SmmRegisterProtocolNotify (\r | |
948 | &gEfiSmmFaultTolerantWriteProtocolGuid,\r | |
949 | SmmFtwNotificationEvent,\r | |
950 | &SmmFtwRegistration\r | |
951 | );\r | |
952 | ASSERT_EFI_ERROR (Status);\r | |
953 | \r | |
954 | SmmFtwNotificationEvent (NULL, NULL, NULL);\r | |
955 | \r | |
956 | return EFI_SUCCESS;\r | |
957 | }\r | |
958 | \r | |
959 | \r |