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1c837cd5 | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>\r | |
4 | \r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions\r | |
7 | of the BSD License which accompanies this distribution. The\r | |
8 | full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <PiSmm.h>\r | |
17 | #include <Library/SmmServicesTableLib.h>\r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/BaseMemoryLib.h>\r | |
20 | #include <Library/LockBoxLib.h>\r | |
21 | #include <Library/DebugLib.h>\r | |
22 | #include <Guid/SmmLockBox.h>\r | |
23 | \r | |
24 | #include "SmmLockBoxLibPrivate.h"\r | |
25 | \r | |
26 | /**\r | |
27 | We need handle this library carefully. Only one library instance will construct the environment.\r | |
28 | Below 2 global variable can only be used in constructor. They should NOT be used in any other library functions.\r | |
29 | **/\r | |
30 | SMM_LOCK_BOX_CONTEXT mSmmLockBoxContext;\r | |
31 | LIST_ENTRY mLockBoxQueue = INITIALIZE_LIST_HEAD_VARIABLE (mLockBoxQueue);\r | |
32 | \r | |
33 | /**\r | |
34 | This function return SmmLockBox context from SMST.\r | |
35 | \r | |
36 | @return SmmLockBox context from SMST.\r | |
37 | **/\r | |
38 | SMM_LOCK_BOX_CONTEXT *\r | |
39 | InternalGetSmmLockBoxContext (\r | |
40 | VOID\r | |
41 | )\r | |
42 | {\r | |
43 | UINTN Index;\r | |
44 | \r | |
45 | //\r | |
46 | // Check if gEfiSmmLockBoxCommunicationGuid is installed by someone\r | |
47 | //\r | |
48 | for (Index = 0; Index < gSmst->NumberOfTableEntries; Index++) {\r | |
49 | if (CompareGuid (&gSmst->SmmConfigurationTable[Index].VendorGuid, &gEfiSmmLockBoxCommunicationGuid)) {\r | |
50 | //\r | |
51 | // Found. That means some other library instance is already run.\r | |
52 | // No need to install again, just return.\r | |
53 | //\r | |
54 | return (SMM_LOCK_BOX_CONTEXT *)gSmst->SmmConfigurationTable[Index].VendorTable;\r | |
55 | }\r | |
56 | }\r | |
57 | \r | |
58 | //\r | |
59 | // Not found.\r | |
60 | //\r | |
61 | return NULL;\r | |
62 | }\r | |
63 | \r | |
64 | /**\r | |
65 | Constructor for SmmLockBox library.\r | |
66 | This is used to set SmmLockBox context, which will be used in PEI phase in S3 boot path later.\r | |
67 | \r | |
68 | @param[in] ImageHandle Image handle of this driver.\r | |
69 | @param[in] SystemTable A Pointer to the EFI System Table.\r | |
70 | \r | |
71 | @retval EFI_SUCEESS \r | |
72 | @return Others Some error occurs.\r | |
73 | **/\r | |
74 | EFI_STATUS\r | |
75 | EFIAPI\r | |
76 | SmmLockBoxSmmConstructuor (\r | |
77 | IN EFI_HANDLE ImageHandle,\r | |
78 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
79 | )\r | |
80 | {\r | |
81 | EFI_STATUS Status;\r | |
82 | SMM_LOCK_BOX_CONTEXT *SmmLockBoxContext;\r | |
83 | \r | |
84 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Enter\n"));\r | |
85 | \r | |
86 | //\r | |
87 | // Check if gEfiSmmLockBoxCommunicationGuid is installed by someone\r | |
88 | //\r | |
89 | SmmLockBoxContext = InternalGetSmmLockBoxContext ();\r | |
90 | if (SmmLockBoxContext != NULL) {\r | |
91 | //\r | |
92 | // Find it. That means some other library instance is already run.\r | |
93 | // No need to install again, just return.\r | |
94 | //\r | |
95 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxContext - already installed\n"));\r | |
96 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Exit\n"));\r | |
97 | return EFI_SUCCESS;\r | |
98 | }\r | |
99 | \r | |
100 | //\r | |
101 | // If no one install this, it means this is first instance. Install it.\r | |
102 | //\r | |
103 | if (sizeof(UINTN) == sizeof(UINT64)) {\r | |
104 | mSmmLockBoxContext.Signature = SMM_LOCK_BOX_SIGNATURE_64;\r | |
105 | } else {\r | |
106 | mSmmLockBoxContext.Signature = SMM_LOCK_BOX_SIGNATURE_32;\r | |
107 | }\r | |
108 | mSmmLockBoxContext.LockBoxDataAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)&mLockBoxQueue;\r | |
109 | \r | |
110 | Status = gSmst->SmmInstallConfigurationTable (\r | |
111 | gSmst,\r | |
112 | &gEfiSmmLockBoxCommunicationGuid,\r | |
113 | &mSmmLockBoxContext,\r | |
114 | sizeof(mSmmLockBoxContext)\r | |
115 | );\r | |
116 | ASSERT_EFI_ERROR (Status);\r | |
117 | \r | |
118 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxContext - %x\n", (UINTN)&mSmmLockBoxContext));\r | |
119 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib LockBoxDataAddress - %x\n", (UINTN)&mLockBoxQueue));\r | |
120 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmConstructuor - Exit\n"));\r | |
121 | \r | |
122 | return Status;\r | |
123 | }\r | |
124 | \r | |
125 | /**\r | |
126 | This function return SmmLockBox queue address.\r | |
127 | \r | |
128 | @return SmmLockBox queue address.\r | |
129 | **/\r | |
130 | LIST_ENTRY *\r | |
131 | InternalGetLockBoxQueue (\r | |
132 | VOID\r | |
133 | )\r | |
134 | {\r | |
135 | SMM_LOCK_BOX_CONTEXT *SmmLockBoxContext;\r | |
136 | \r | |
137 | SmmLockBoxContext = InternalGetSmmLockBoxContext ();\r | |
138 | ASSERT (SmmLockBoxContext != NULL);\r | |
139 | if (SmmLockBoxContext == NULL) {\r | |
140 | return NULL;\r | |
141 | }\r | |
142 | return (LIST_ENTRY *)(UINTN)SmmLockBoxContext->LockBoxDataAddress;\r | |
143 | }\r | |
144 | \r | |
145 | /**\r | |
146 | This function find LockBox by GUID.\r | |
147 | \r | |
148 | @param Guid The guid to indentify the LockBox\r | |
149 | \r | |
150 | @return LockBoxData\r | |
151 | **/\r | |
152 | SMM_LOCK_BOX_DATA *\r | |
153 | InternalFindLockBoxByGuid (\r | |
154 | IN EFI_GUID *Guid\r | |
155 | )\r | |
156 | {\r | |
157 | LIST_ENTRY *Link;\r | |
158 | SMM_LOCK_BOX_DATA *LockBox;\r | |
159 | LIST_ENTRY *LockBoxQueue;\r | |
160 | \r | |
161 | LockBoxQueue = InternalGetLockBoxQueue ();\r | |
162 | ASSERT (LockBoxQueue != NULL);\r | |
163 | \r | |
164 | for (Link = LockBoxQueue->ForwardLink;\r | |
165 | Link != LockBoxQueue;\r | |
166 | Link = Link->ForwardLink) {\r | |
167 | LockBox = BASE_CR (\r | |
168 | Link,\r | |
169 | SMM_LOCK_BOX_DATA,\r | |
170 | Link\r | |
171 | );\r | |
172 | if (CompareGuid (&LockBox->Guid, Guid)) {\r | |
173 | return LockBox;\r | |
174 | }\r | |
175 | }\r | |
176 | return NULL;\r | |
177 | }\r | |
178 | \r | |
179 | /**\r | |
180 | This function will save confidential information to lockbox.\r | |
181 | \r | |
182 | @param Guid the guid to identify the confidential information\r | |
183 | @param Buffer the address of the confidential information\r | |
184 | @param Length the length of the confidential information\r | |
185 | \r | |
186 | @retval RETURN_SUCCESS the information is saved successfully.\r | |
187 | @retval RETURN_INVALID_PARAMETER the Guid is NULL, or Buffer is NULL, or Length is 0\r | |
188 | @retval RETURN_ALREADY_STARTED the requested GUID already exist.\r | |
189 | @retval RETURN_OUT_OF_RESOURCES no enough resource to save the information.\r | |
190 | @retval RETURN_ACCESS_DENIED it is too late to invoke this interface\r | |
191 | @retval RETURN_NOT_STARTED it is too early to invoke this interface\r | |
192 | @retval RETURN_UNSUPPORTED the service is not supported by implementaion.\r | |
193 | **/\r | |
194 | RETURN_STATUS\r | |
195 | EFIAPI\r | |
196 | SaveLockBox (\r | |
197 | IN GUID *Guid,\r | |
198 | IN VOID *Buffer,\r | |
199 | IN UINTN Length\r | |
200 | )\r | |
201 | {\r | |
202 | SMM_LOCK_BOX_DATA *LockBox;\r | |
203 | EFI_PHYSICAL_ADDRESS SmramBuffer;\r | |
204 | EFI_STATUS Status;\r | |
205 | LIST_ENTRY *LockBoxQueue;\r | |
206 | \r | |
207 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Enter\n"));\r | |
208 | \r | |
209 | //\r | |
210 | // Basic check\r | |
211 | //\r | |
212 | if ((Guid == NULL) || (Buffer == NULL) || (Length == 0)) {\r | |
213 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));\r | |
214 | return EFI_INVALID_PARAMETER;\r | |
215 | }\r | |
216 | \r | |
217 | //\r | |
218 | // Find LockBox\r | |
219 | //\r | |
220 | LockBox = InternalFindLockBoxByGuid (Guid);\r | |
221 | if (LockBox != NULL) {\r | |
222 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_ALREADY_STARTED));\r | |
223 | return EFI_ALREADY_STARTED;\r | |
224 | }\r | |
225 | \r | |
226 | //\r | |
227 | // Allocate SMRAM buffer\r | |
228 | //\r | |
229 | Status = gSmst->SmmAllocatePages (\r | |
230 | AllocateAnyPages,\r | |
231 | EfiRuntimeServicesData,\r | |
232 | EFI_SIZE_TO_PAGES (Length),\r | |
233 | &SmramBuffer\r | |
234 | );\r | |
235 | ASSERT_EFI_ERROR (Status);\r | |
236 | if (EFI_ERROR (Status)) {\r | |
237 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_OUT_OF_RESOURCES));\r | |
238 | return EFI_OUT_OF_RESOURCES;\r | |
239 | }\r | |
240 | \r | |
241 | //\r | |
242 | // Allocate LockBox\r | |
243 | //\r | |
244 | Status = gSmst->SmmAllocatePool (\r | |
245 | EfiRuntimeServicesData,\r | |
246 | sizeof(*LockBox),\r | |
247 | (VOID **)&LockBox\r | |
248 | );\r | |
249 | ASSERT_EFI_ERROR (Status);\r | |
250 | if (EFI_ERROR (Status)) {\r | |
251 | gSmst->SmmFreePages (SmramBuffer, EFI_SIZE_TO_PAGES (Length));\r | |
252 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_OUT_OF_RESOURCES));\r | |
253 | return EFI_OUT_OF_RESOURCES;\r | |
254 | }\r | |
255 | \r | |
256 | //\r | |
257 | // Save data\r | |
258 | //\r | |
259 | CopyMem ((VOID *)(UINTN)SmramBuffer, (VOID *)(UINTN)Buffer, Length);\r | |
260 | \r | |
261 | //\r | |
262 | // Insert LockBox to queue\r | |
263 | //\r | |
264 | LockBox->Signature = SMM_LOCK_BOX_DATA_SIGNATURE;\r | |
265 | CopyMem (&LockBox->Guid, Guid, sizeof(EFI_GUID));\r | |
266 | LockBox->Buffer = (EFI_PHYSICAL_ADDRESS)(UINTN)Buffer;\r | |
267 | LockBox->Length = (UINT64)Length;\r | |
268 | LockBox->SmramBuffer = SmramBuffer;\r | |
269 | \r | |
270 | LockBoxQueue = InternalGetLockBoxQueue ();\r | |
271 | ASSERT (LockBoxQueue != NULL);\r | |
272 | InsertTailList (LockBoxQueue, &LockBox->Link);\r | |
273 | \r | |
274 | //\r | |
275 | // Done\r | |
276 | //\r | |
277 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SaveLockBox - Exit (%r)\n", EFI_SUCCESS));\r | |
278 | return EFI_SUCCESS;\r | |
279 | }\r | |
280 | \r | |
281 | /**\r | |
282 | This function will set lockbox attributes.\r | |
283 | \r | |
284 | @param Guid the guid to identify the confidential information\r | |
285 | @param Attributes the attributes of the lockbox\r | |
286 | \r | |
287 | @retval RETURN_SUCCESS the information is saved successfully.\r | |
288 | @retval RETURN_INVALID_PARAMETER attributes is invalid.\r | |
289 | @retval RETURN_NOT_FOUND the requested GUID not found.\r | |
290 | @retval RETURN_ACCESS_DENIED it is too late to invoke this interface\r | |
291 | @retval RETURN_NOT_STARTED it is too early to invoke this interface\r | |
292 | @retval RETURN_UNSUPPORTED the service is not supported by implementaion.\r | |
293 | **/\r | |
294 | RETURN_STATUS\r | |
295 | EFIAPI\r | |
296 | SetLockBoxAttributes (\r | |
297 | IN GUID *Guid,\r | |
298 | IN UINT64 Attributes\r | |
299 | )\r | |
300 | {\r | |
301 | SMM_LOCK_BOX_DATA *LockBox;\r | |
302 | \r | |
303 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Enter\n"));\r | |
304 | \r | |
305 | //\r | |
306 | // Basic check\r | |
307 | //\r | |
308 | if ((Guid == NULL) ||\r | |
309 | ((Attributes & ~LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) != 0)) {\r | |
310 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_INVALID_PARAMETER));\r | |
311 | return EFI_INVALID_PARAMETER;\r | |
312 | }\r | |
313 | \r | |
314 | //\r | |
315 | // Find LockBox\r | |
316 | //\r | |
317 | LockBox = InternalFindLockBoxByGuid (Guid);\r | |
318 | if (LockBox == NULL) {\r | |
319 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_NOT_FOUND));\r | |
320 | return EFI_NOT_FOUND;\r | |
321 | }\r | |
322 | \r | |
323 | //\r | |
324 | // Update data\r | |
325 | //\r | |
326 | LockBox->Attributes = Attributes;\r | |
327 | \r | |
328 | //\r | |
329 | // Done\r | |
330 | //\r | |
331 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SetLockBoxAttributes - Exit (%r)\n", EFI_SUCCESS));\r | |
332 | return EFI_SUCCESS;\r | |
333 | }\r | |
334 | \r | |
335 | /**\r | |
336 | This function will update confidential information to lockbox.\r | |
337 | \r | |
338 | @param Guid the guid to identify the original confidential information\r | |
339 | @param Offset the offset of the original confidential information\r | |
340 | @param Buffer the address of the updated confidential information\r | |
341 | @param Length the length of the updated confidential information\r | |
342 | \r | |
343 | @retval RETURN_SUCCESS the information is saved successfully.\r | |
344 | @retval RETURN_INVALID_PARAMETER the Guid is NULL, or Buffer is NULL, or Length is 0.\r | |
345 | @retval RETURN_NOT_FOUND the requested GUID not found.\r | |
346 | @retval RETURN_BUFFER_TOO_SMALL the original buffer to too small to hold new information.\r | |
347 | @retval RETURN_ACCESS_DENIED it is too late to invoke this interface\r | |
348 | @retval RETURN_NOT_STARTED it is too early to invoke this interface\r | |
349 | @retval RETURN_UNSUPPORTED the service is not supported by implementaion.\r | |
350 | **/\r | |
351 | RETURN_STATUS\r | |
352 | EFIAPI\r | |
353 | UpdateLockBox (\r | |
354 | IN GUID *Guid,\r | |
355 | IN UINTN Offset,\r | |
356 | IN VOID *Buffer,\r | |
357 | IN UINTN Length\r | |
358 | )\r | |
359 | {\r | |
360 | SMM_LOCK_BOX_DATA *LockBox;\r | |
361 | \r | |
362 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Enter\n"));\r | |
363 | \r | |
364 | //\r | |
365 | // Basic check\r | |
366 | //\r | |
367 | if ((Guid == NULL) || (Buffer == NULL) || (Length == 0)) {\r | |
368 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));\r | |
369 | return EFI_INVALID_PARAMETER;\r | |
370 | }\r | |
371 | \r | |
372 | //\r | |
373 | // Find LockBox\r | |
374 | //\r | |
375 | LockBox = InternalFindLockBoxByGuid (Guid);\r | |
376 | if (LockBox == NULL) {\r | |
377 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_NOT_FOUND));\r | |
378 | return EFI_NOT_FOUND;\r | |
379 | }\r | |
380 | \r | |
381 | //\r | |
382 | // Update data\r | |
383 | //\r | |
384 | if (LockBox->Length < Offset + Length) {\r | |
385 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_BUFFER_TOO_SMALL));\r | |
386 | return EFI_BUFFER_TOO_SMALL;\r | |
387 | }\r | |
388 | CopyMem ((VOID *)((UINTN)LockBox->SmramBuffer + Offset), Buffer, Length);\r | |
389 | \r | |
390 | //\r | |
391 | // Done\r | |
392 | //\r | |
393 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib UpdateLockBox - Exit (%r)\n", EFI_SUCCESS));\r | |
394 | return EFI_SUCCESS;\r | |
395 | }\r | |
396 | \r | |
397 | /**\r | |
398 | This function will restore confidential information from lockbox.\r | |
399 | \r | |
400 | @param Guid the guid to identify the confidential information\r | |
401 | @param Buffer the address of the restored confidential information\r | |
402 | NULL means restored to original address, Length MUST be NULL at same time.\r | |
403 | @param Length the length of the restored confidential information\r | |
404 | \r | |
405 | @retval RETURN_SUCCESS the information is restored successfully.\r | |
406 | @retval RETURN_INVALID_PARAMETER the Guid is NULL, or one of Buffer and Length is NULL.\r | |
407 | @retval RETURN_WRITE_PROTECTED Buffer and Length are NULL, but the LockBox has no \r | |
408 | LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE attribute.\r | |
409 | @retval RETURN_BUFFER_TOO_SMALL the Length is too small to hold the confidential information.\r | |
410 | @retval RETURN_NOT_FOUND the requested GUID not found.\r | |
411 | @retval RETURN_NOT_STARTED it is too early to invoke this interface\r | |
412 | @retval RETURN_ACCESS_DENIED not allow to restore to the address\r | |
413 | @retval RETURN_UNSUPPORTED the service is not supported by implementaion.\r | |
414 | **/\r | |
415 | RETURN_STATUS\r | |
416 | EFIAPI\r | |
417 | RestoreLockBox (\r | |
418 | IN GUID *Guid,\r | |
419 | IN VOID *Buffer, OPTIONAL\r | |
420 | IN OUT UINTN *Length OPTIONAL\r | |
421 | )\r | |
422 | {\r | |
423 | SMM_LOCK_BOX_DATA *LockBox;\r | |
424 | VOID *RestoreBuffer;\r | |
425 | \r | |
426 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Enter\n"));\r | |
427 | \r | |
428 | //\r | |
429 | // Restore this, Buffer and Length MUST be both NULL or both non-NULL\r | |
430 | //\r | |
431 | if ((Guid == NULL) ||\r | |
432 | ((Buffer == NULL) && (Length != NULL)) ||\r | |
433 | ((Buffer != NULL) && (Length == NULL))) {\r | |
434 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_INVALID_PARAMETER));\r | |
435 | return EFI_INVALID_PARAMETER;\r | |
436 | }\r | |
437 | \r | |
438 | //\r | |
439 | // Find LockBox\r | |
440 | //\r | |
441 | LockBox = InternalFindLockBoxByGuid (Guid);\r | |
442 | if (LockBox == NULL) {\r | |
443 | //\r | |
444 | // Not found\r | |
445 | //\r | |
446 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_NOT_FOUND));\r | |
447 | return EFI_NOT_FOUND;\r | |
448 | }\r | |
449 | \r | |
450 | //\r | |
451 | // Set RestoreBuffer\r | |
452 | //\r | |
453 | if (Buffer != NULL) {\r | |
454 | //\r | |
455 | // restore to new buffer\r | |
456 | //\r | |
457 | RestoreBuffer = Buffer;\r | |
458 | } else {\r | |
459 | //\r | |
460 | // restore to original buffer\r | |
461 | //\r | |
462 | if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) == 0) {\r | |
463 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_WRITE_PROTECTED));\r | |
464 | return EFI_WRITE_PROTECTED;\r | |
465 | }\r | |
466 | RestoreBuffer = (VOID *)(UINTN)LockBox->Buffer;\r | |
467 | }\r | |
468 | \r | |
469 | //\r | |
470 | // Set RestoreLength\r | |
471 | //\r | |
472 | if (Length != NULL) {\r | |
473 | if (*Length < (UINTN)LockBox->Length) {\r | |
474 | //\r | |
475 | // Input buffer is too small to hold all data.\r | |
476 | //\r | |
477 | *Length = (UINTN)LockBox->Length;\r | |
478 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_BUFFER_TOO_SMALL));\r | |
479 | return EFI_BUFFER_TOO_SMALL;\r | |
480 | }\r | |
481 | *Length = (UINTN)LockBox->Length;\r | |
482 | }\r | |
483 | \r | |
484 | //\r | |
485 | // Restore data\r | |
486 | //\r | |
487 | CopyMem (RestoreBuffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);\r | |
488 | \r | |
489 | //\r | |
490 | // Done\r | |
491 | //\r | |
492 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreLockBox - Exit (%r)\n", EFI_SUCCESS));\r | |
493 | return EFI_SUCCESS;\r | |
494 | }\r | |
495 | \r | |
496 | /**\r | |
497 | This function will restore confidential information from all lockbox which have RestoreInPlace attribute.\r | |
498 | \r | |
499 | @retval RETURN_SUCCESS the information is restored successfully.\r | |
500 | @retval RETURN_NOT_STARTED it is too early to invoke this interface\r | |
501 | @retval RETURN_UNSUPPORTED the service is not supported by implementaion.\r | |
502 | **/\r | |
503 | RETURN_STATUS\r | |
504 | EFIAPI\r | |
505 | RestoreAllLockBoxInPlace (\r | |
506 | VOID\r | |
507 | )\r | |
508 | {\r | |
509 | SMM_LOCK_BOX_DATA *LockBox;\r | |
510 | LIST_ENTRY *Link;\r | |
511 | LIST_ENTRY *LockBoxQueue;\r | |
512 | \r | |
513 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreAllLockBoxInPlace - Enter\n"));\r | |
514 | \r | |
515 | LockBoxQueue = InternalGetLockBoxQueue ();\r | |
516 | ASSERT (LockBoxQueue != NULL);\r | |
517 | \r | |
518 | //\r | |
519 | // Restore all, Buffer and Length MUST be NULL\r | |
520 | //\r | |
521 | for (Link = LockBoxQueue->ForwardLink;\r | |
522 | Link != LockBoxQueue;\r | |
523 | Link = Link->ForwardLink) {\r | |
524 | LockBox = BASE_CR (\r | |
525 | Link,\r | |
526 | SMM_LOCK_BOX_DATA,\r | |
527 | Link\r | |
528 | );\r | |
529 | if ((LockBox->Attributes & LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE) != 0) {\r | |
530 | //\r | |
531 | // Restore data\r | |
532 | //\r | |
533 | CopyMem ((VOID *)(UINTN)LockBox->Buffer, (VOID *)(UINTN)LockBox->SmramBuffer, (UINTN)LockBox->Length);\r | |
534 | }\r | |
535 | }\r | |
536 | //\r | |
537 | // Done\r | |
538 | //\r | |
539 | DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib RestoreAllLockBoxInPlace - Exit (%r)\n", EFI_SUCCESS));\r | |
540 | return EFI_SUCCESS;\r | |
541 | }\r | |
542 | \r |