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1 | /**@file\r | |
2 | This code produces the Data Hub protocol. It preloads the data hub\r | |
3 | with status information copied in from PEI HOBs.\r | |
4 | \r | |
5 | Only code that implements the Data Hub protocol should go in this file!\r | |
6 | \r | |
7 | The Term MTC stands for MonoTonicCounter. \r | |
8 | \r | |
9 | For more information please look at DataHub.doc\r | |
10 | \r | |
11 | NOTE: For extra security of the log GetNextDataRecord () could return a copy\r | |
12 | of the data record.\r | |
13 | \r | |
14 | Copyright (c) 2006, Intel Corporation \r | |
15 | All rights reserved. This program and the accompanying materials \r | |
16 | are licensed and made available under the terms and conditions of the BSD License \r | |
17 | which accompanies this distribution. The full text of the license may be found at \r | |
18 | http://opensource.org/licenses/bsd-license.php \r | |
19 | \r | |
20 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
21 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
22 | \r | |
23 | **/\r | |
24 | \r | |
25 | #include "DataHub.h"\r | |
26 | \r | |
27 | CONST EFI_GUID gZeroGuid = { 0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 } };\r | |
28 | \r | |
29 | //\r | |
30 | // Worker functions private to this file\r | |
31 | //\r | |
32 | DATA_HUB_FILTER_DRIVER *\r | |
33 | FindFilterDriverByEvent (\r | |
34 | IN LIST_ENTRY *Head,\r | |
35 | IN EFI_EVENT Event\r | |
36 | );\r | |
37 | \r | |
38 | EFI_DATA_RECORD_HEADER *\r | |
39 | GetNextDataRecord (\r | |
40 | IN LIST_ENTRY *Head,\r | |
41 | IN UINT64 ClassFilter,\r | |
42 | IN OUT UINT64 *PtrCurrentMTC\r | |
43 | );\r | |
44 | \r | |
45 | /**\r | |
46 | \r | |
47 | Log data record into the data logging hub\r | |
48 | \r | |
49 | @param This - Protocol instance structure\r | |
50 | @param DataRecordGuid - GUID that defines record contents\r | |
51 | @param ProducerName - GUID that defines the name of the producer of the data\r | |
52 | @param DataRecordClass - Class that defines generic record type\r | |
53 | @param RawData - Data Log record as defined by DataRecordGuid\r | |
54 | @param RawDataSize - Size of Data Log data in bytes\r | |
55 | \r | |
56 | @retval EFI_SUCCESS - If data was logged\r | |
57 | @retval EFI_OUT_OF_RESOURCES - If data was not logged due to lack of system \r | |
58 | resources.\r | |
59 | **/\r | |
60 | EFI_STATUS\r | |
61 | EFIAPI\r | |
62 | DataHubLogData (\r | |
63 | IN EFI_DATA_HUB_PROTOCOL *This,\r | |
64 | IN EFI_GUID *DataRecordGuid,\r | |
65 | IN EFI_GUID *ProducerName,\r | |
66 | IN UINT64 DataRecordClass,\r | |
67 | IN VOID *RawData,\r | |
68 | IN UINT32 RawDataSize\r | |
69 | )\r | |
70 | {\r | |
71 | EFI_STATUS Status;\r | |
72 | DATA_HUB_INSTANCE *Private;\r | |
73 | EFI_DATA_ENTRY *LogEntry;\r | |
74 | UINT32 TotalSize;\r | |
75 | UINT32 RecordSize;\r | |
76 | EFI_DATA_RECORD_HEADER *Record;\r | |
77 | VOID *Raw;\r | |
78 | DATA_HUB_FILTER_DRIVER *FilterEntry;\r | |
79 | LIST_ENTRY *Link;\r | |
80 | LIST_ENTRY *Head;\r | |
81 | \r | |
82 | Private = DATA_HUB_INSTANCE_FROM_THIS (This);\r | |
83 | \r | |
84 | //\r | |
85 | // Combine the storage for the internal structs and a copy of the log record.\r | |
86 | // Record follows PrivateLogEntry. The consumer will be returned a pointer\r | |
87 | // to Record so we don't what it to be the thing that was allocated from\r | |
88 | // pool, so the consumer can't free an data record by mistake.\r | |
89 | //\r | |
90 | RecordSize = sizeof (EFI_DATA_RECORD_HEADER) + RawDataSize;\r | |
91 | TotalSize = sizeof (EFI_DATA_ENTRY) + RecordSize;\r | |
92 | \r | |
93 | //\r | |
94 | // The Logging action is the critical section, so it is locked.\r | |
95 | // The MTC asignment & update, time, and logging must be an\r | |
96 | // atomic operation, so use the lock.\r | |
97 | //\r | |
98 | Status = EfiAcquireLockOrFail (&Private->DataLock);\r | |
99 | if (EFI_ERROR (Status)) {\r | |
100 | //\r | |
101 | // Reentrancy detected so exit!\r | |
102 | //\r | |
103 | return Status;\r | |
104 | }\r | |
105 | \r | |
106 | LogEntry = AllocatePool (TotalSize);\r | |
107 | \r | |
108 | if (LogEntry == NULL) {\r | |
109 | EfiReleaseLock (&Private->DataLock);\r | |
110 | return EFI_OUT_OF_RESOURCES;\r | |
111 | }\r | |
112 | \r | |
113 | ZeroMem (LogEntry, TotalSize);\r | |
114 | \r | |
115 | Record = (EFI_DATA_RECORD_HEADER *) (LogEntry + 1);\r | |
116 | Raw = (VOID *) (Record + 1);\r | |
117 | \r | |
118 | //\r | |
119 | // Build Standard Log Header\r | |
120 | //\r | |
121 | Record->Version = EFI_DATA_RECORD_HEADER_VERSION;\r | |
122 | Record->HeaderSize = sizeof (EFI_DATA_RECORD_HEADER);\r | |
123 | Record->RecordSize = RecordSize;\r | |
124 | CopyMem (&Record->DataRecordGuid, DataRecordGuid, sizeof (EFI_GUID));\r | |
125 | CopyMem (&Record->ProducerName, ProducerName, sizeof (EFI_GUID));\r | |
126 | Record->DataRecordClass = DataRecordClass;\r | |
127 | \r | |
128 | //\r | |
129 | // Ensure LogMonotonicCount is not zero\r | |
130 | //\r | |
131 | Record->LogMonotonicCount = ++Private->GlobalMonotonicCount;\r | |
132 | \r | |
133 | gRT->GetTime (&Record->LogTime, NULL);\r | |
134 | \r | |
135 | //\r | |
136 | // Insert log into the internal linked list.\r | |
137 | //\r | |
138 | LogEntry->Signature = EFI_DATA_ENTRY_SIGNATURE;\r | |
139 | LogEntry->Record = Record;\r | |
140 | LogEntry->RecordSize = sizeof (EFI_DATA_ENTRY) + RawDataSize;\r | |
141 | InsertTailList (&Private->DataListHead, &LogEntry->Link);\r | |
142 | \r | |
143 | CopyMem (Raw, RawData, RawDataSize);\r | |
144 | \r | |
145 | EfiReleaseLock (&Private->DataLock);\r | |
146 | \r | |
147 | //\r | |
148 | // Send Signal to all the filter drivers which are interested\r | |
149 | // in the record's class and guid.\r | |
150 | //\r | |
151 | Head = &Private->FilterDriverListHead;\r | |
152 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r | |
153 | FilterEntry = FILTER_ENTRY_FROM_LINK (Link);\r | |
154 | if (((FilterEntry->ClassFilter & DataRecordClass) != 0) &&\r | |
155 | (CompareGuid (&FilterEntry->FilterDataRecordGuid, &gZeroGuid) || \r | |
156 | CompareGuid (&FilterEntry->FilterDataRecordGuid, DataRecordGuid))) {\r | |
157 | gBS->SignalEvent (FilterEntry->Event);\r | |
158 | }\r | |
159 | }\r | |
160 | \r | |
161 | return EFI_SUCCESS;\r | |
162 | }\r | |
163 | \r | |
164 | /**\r | |
165 | \r | |
166 | Get a previously logged data record and the MonotonicCount for the next\r | |
167 | availible Record. This allows all records or all records later \r | |
168 | than a give MonotonicCount to be returned. If an optional FilterDriverEvent\r | |
169 | is passed in with a MonotonicCout of zero return the first record \r | |
170 | not yet read by the filter driver. If FilterDriverEvent is NULL and \r | |
171 | MonotonicCount is zero return the first data record.\r | |
172 | \r | |
173 | @param This The EFI_DATA_HUB_PROTOCOL instance.\r | |
174 | @param MonotonicCount Specifies the Record to return. On input, zero means\r | |
175 | return the first record. On output, contains the next\r | |
176 | record to availible. Zero indicates no more records.\r | |
177 | @param FilterDriverEvent If FilterDriverEvent is not passed in a MonotonicCount \r | |
178 | of zero, it means to return the first data record. \r | |
179 | If FilterDriverEvent is passed in, then a MonotonicCount \r | |
180 | of zero means to return the first data not yet read by \r | |
181 | FilterDriverEvent.\r | |
182 | @param Record Returns a dynamically allocated memory buffer with a data \r | |
183 | record that matches MonotonicCount.\r | |
184 | \r | |
185 | @retval EFI_SUCCESS - Data was returned in Record.\r | |
186 | @retval EFI_INVALID_PARAMETER - FilterDriverEvent was passed in but does not exist.\r | |
187 | @retval EFI_NOT_FOUND - MonotonicCount does not match any data record in the\r | |
188 | system. If a MonotonicCount of zero was passed in, then\r | |
189 | no data records exist in the system.\r | |
190 | @retval EFI_OUT_OF_RESOURCES - Record was not returned due to lack of system resources.\r | |
191 | \r | |
192 | **/\r | |
193 | EFI_STATUS\r | |
194 | EFIAPI\r | |
195 | DataHubGetNextRecord (\r | |
196 | IN EFI_DATA_HUB_PROTOCOL *This,\r | |
197 | IN OUT UINT64 *MonotonicCount,\r | |
198 | IN EFI_EVENT *FilterDriverEvent, OPTIONAL\r | |
199 | OUT EFI_DATA_RECORD_HEADER **Record\r | |
200 | )\r | |
201 | {\r | |
202 | DATA_HUB_INSTANCE *Private;\r | |
203 | DATA_HUB_FILTER_DRIVER *FilterDriver;\r | |
204 | UINT64 ClassFilter;\r | |
205 | UINT64 FilterMonotonicCount;\r | |
206 | \r | |
207 | Private = DATA_HUB_INSTANCE_FROM_THIS (This);\r | |
208 | \r | |
209 | FilterDriver = NULL;\r | |
210 | FilterMonotonicCount = 0;\r | |
211 | ClassFilter = EFI_DATA_RECORD_CLASS_DEBUG |\r | |
212 | EFI_DATA_RECORD_CLASS_ERROR |\r | |
213 | EFI_DATA_RECORD_CLASS_DATA |\r | |
214 | EFI_DATA_RECORD_CLASS_PROGRESS_CODE;\r | |
215 | \r | |
216 | if (FilterDriverEvent != NULL) {\r | |
217 | //\r | |
218 | // For events the beginning is the last unread record. This info is\r | |
219 | // stored in the instance structure, so we must look up the event\r | |
220 | // to get the data.\r | |
221 | //\r | |
222 | FilterDriver = FindFilterDriverByEvent (\r | |
223 | &Private->FilterDriverListHead,\r | |
224 | *FilterDriverEvent\r | |
225 | );\r | |
226 | if (FilterDriver == NULL) {\r | |
227 | return EFI_INVALID_PARAMETER;\r | |
228 | }\r | |
229 | //\r | |
230 | // Use the Class filter the event was created with.\r | |
231 | //\r | |
232 | ClassFilter = FilterDriver->ClassFilter;\r | |
233 | \r | |
234 | if (*MonotonicCount == 0) {\r | |
235 | //\r | |
236 | // Use the MTC from the Filter Driver.\r | |
237 | //\r | |
238 | FilterMonotonicCount = FilterDriver->GetNextMonotonicCount;\r | |
239 | if (FilterMonotonicCount != 0) {\r | |
240 | //\r | |
241 | // The GetNextMonotonicCount field remembers the last value from the previous time.\r | |
242 | // But we already processed this vaule, so we need to find the next one.\r | |
243 | //\r | |
244 | *Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, &FilterMonotonicCount);\r | |
245 | *MonotonicCount = FilterMonotonicCount;\r | |
246 | if (FilterMonotonicCount == 0) {\r | |
247 | //\r | |
248 | // If there is no new record to get exit now.\r | |
249 | //\r | |
250 | return EFI_NOT_FOUND;\r | |
251 | }\r | |
252 | }\r | |
253 | }\r | |
254 | }\r | |
255 | //\r | |
256 | // Return the record\r | |
257 | //\r | |
258 | *Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, MonotonicCount);\r | |
259 | if (*Record == NULL) {\r | |
260 | return EFI_NOT_FOUND;\r | |
261 | }\r | |
262 | \r | |
263 | if (FilterDriver != NULL) {\r | |
264 | //\r | |
265 | // If we have a filter driver update the records that have been read.\r | |
266 | // If MonotonicCount is zero No more reacords left.\r | |
267 | //\r | |
268 | if (*MonotonicCount == 0) {\r | |
269 | //\r | |
270 | // Save the current Record MonotonicCount.\r | |
271 | //\r | |
272 | FilterDriver->GetNextMonotonicCount = (*Record)->LogMonotonicCount;\r | |
273 | } else {\r | |
274 | //\r | |
275 | // Point to next undread record\r | |
276 | //\r | |
277 | FilterDriver->GetNextMonotonicCount = *MonotonicCount;\r | |
278 | }\r | |
279 | }\r | |
280 | \r | |
281 | return EFI_SUCCESS;\r | |
282 | }\r | |
283 | \r | |
284 | /**\r | |
285 | This function registers the data hub filter driver that is represented \r | |
286 | by FilterEvent. Only one instance of each FilterEvent can be registered.\r | |
287 | After the FilterEvent is registered, it will be signaled so it can sync \r | |
288 | with data records that have been recorded prior to the FilterEvent being \r | |
289 | registered.\r | |
290 | \r | |
291 | @param This - The EFI_DATA_HUB_PROTOCOL instance.\r | |
292 | @param FilterEvent - The EFI_EVENT to signal whenever data that matches \r | |
293 | FilterClass is logged in the system.\r | |
294 | @param FilterTpl - The maximum EFI_TPL at which FilterEvent can be \r | |
295 | signaled. It is strongly recommended that you use the \r | |
296 | lowest EFI_TPL possible.\r | |
297 | @param FilterClass - FilterEvent will be signaled whenever a bit in \r | |
298 | EFI_DATA_RECORD_HEADER.DataRecordClass is also set in \r | |
299 | FilterClass. If FilterClass is zero, no class-based \r | |
300 | filtering will be performed.\r | |
301 | @param FilterDataRecordGuid - FilterEvent will be signaled whenever FilterDataRecordGuid \r | |
302 | matches EFI_DATA_RECORD_HEADER.DataRecordGuid. If \r | |
303 | FilterDataRecordGuid is NULL, then no GUID-based filtering \r | |
304 | will be performed. \r | |
305 | \r | |
306 | @retval EFI_SUCCESS - The filter driver event was registered.\r | |
307 | @retval EFI_ALREADY_STARTED - FilterEvent was previously registered and cannot be \r | |
308 | registered again.\r | |
309 | @retval EFI_OUT_OF_RESOURCES - The filter driver event was not registered due to lack of \r | |
310 | system resources.\r | |
311 | \r | |
312 | **/\r | |
313 | EFI_STATUS\r | |
314 | EFIAPI\r | |
315 | DataHubRegisterFilterDriver (\r | |
316 | IN EFI_DATA_HUB_PROTOCOL * This,\r | |
317 | IN EFI_EVENT FilterEvent,\r | |
318 | IN EFI_TPL FilterTpl,\r | |
319 | IN UINT64 FilterClass,\r | |
320 | IN EFI_GUID * FilterDataRecordGuid OPTIONAL\r | |
321 | )\r | |
322 | \r | |
323 | {\r | |
324 | DATA_HUB_INSTANCE *Private;\r | |
325 | DATA_HUB_FILTER_DRIVER *FilterDriver;\r | |
326 | \r | |
327 | Private = DATA_HUB_INSTANCE_FROM_THIS (This);\r | |
328 | \r | |
329 | FilterDriver = (DATA_HUB_FILTER_DRIVER *) AllocateZeroPool (sizeof (DATA_HUB_FILTER_DRIVER));\r | |
330 | if (FilterDriver == NULL) {\r | |
331 | return EFI_OUT_OF_RESOURCES;\r | |
332 | }\r | |
333 | //\r | |
334 | // Initialize filter driver info\r | |
335 | //\r | |
336 | FilterDriver->Signature = EFI_DATA_HUB_FILTER_DRIVER_SIGNATURE;\r | |
337 | FilterDriver->Event = FilterEvent;\r | |
338 | FilterDriver->Tpl = FilterTpl;\r | |
339 | FilterDriver->GetNextMonotonicCount = 0;\r | |
340 | if (FilterClass == 0) {\r | |
341 | FilterDriver->ClassFilter = EFI_DATA_RECORD_CLASS_DEBUG |\r | |
342 | EFI_DATA_RECORD_CLASS_ERROR |\r | |
343 | EFI_DATA_RECORD_CLASS_DATA |\r | |
344 | EFI_DATA_RECORD_CLASS_PROGRESS_CODE;\r | |
345 | } else {\r | |
346 | FilterDriver->ClassFilter = FilterClass;\r | |
347 | }\r | |
348 | \r | |
349 | if (FilterDataRecordGuid != NULL) {\r | |
350 | CopyMem (&FilterDriver->FilterDataRecordGuid, FilterDataRecordGuid, sizeof (EFI_GUID));\r | |
351 | }\r | |
352 | //\r | |
353 | // Search for duplicate entries\r | |
354 | //\r | |
355 | if (FindFilterDriverByEvent (&Private->FilterDriverListHead, FilterEvent) != NULL) {\r | |
356 | FreePool (FilterDriver);\r | |
357 | return EFI_ALREADY_STARTED;\r | |
358 | }\r | |
359 | //\r | |
360 | // Make insertion an atomic operation with the lock.\r | |
361 | //\r | |
362 | EfiAcquireLock (&Private->DataLock);\r | |
363 | InsertTailList (&Private->FilterDriverListHead, &FilterDriver->Link);\r | |
364 | EfiReleaseLock (&Private->DataLock);\r | |
365 | \r | |
366 | //\r | |
367 | // Signal the Filter driver we just loaded so they will recieve all the\r | |
368 | // previous history. If we did not signal here we would have to wait until\r | |
369 | // the next data was logged to get the history. In a case where no next\r | |
370 | // data was logged we would never get synced up.\r | |
371 | //\r | |
372 | gBS->SignalEvent (FilterEvent);\r | |
373 | \r | |
374 | return EFI_SUCCESS;\r | |
375 | }\r | |
376 | \r | |
377 | /**\r | |
378 | Remove a Filter Driver, so it no longer gets called when data \r | |
379 | information is logged.\r | |
380 | \r | |
381 | @param This - Protocol instance structure\r | |
382 | \r | |
383 | @param FilterEvent - Event that represents a filter driver that is to be \r | |
384 | Unregistered.\r | |
385 | \r | |
386 | @retval EFI_SUCCESS - If FilterEvent was unregistered\r | |
387 | \r | |
388 | @retval EFI_NOT_FOUND - If FilterEvent does not exist\r | |
389 | \r | |
390 | **/\r | |
391 | EFI_STATUS\r | |
392 | EFIAPI\r | |
393 | DataHubUnregisterFilterDriver (\r | |
394 | IN EFI_DATA_HUB_PROTOCOL *This,\r | |
395 | IN EFI_EVENT FilterEvent\r | |
396 | )\r | |
397 | {\r | |
398 | DATA_HUB_INSTANCE *Private;\r | |
399 | DATA_HUB_FILTER_DRIVER *FilterDriver;\r | |
400 | \r | |
401 | Private = DATA_HUB_INSTANCE_FROM_THIS (This);\r | |
402 | \r | |
403 | //\r | |
404 | // Search for duplicate entries\r | |
405 | //\r | |
406 | FilterDriver = FindFilterDriverByEvent (\r | |
407 | &Private->FilterDriverListHead,\r | |
408 | FilterEvent\r | |
409 | );\r | |
410 | if (FilterDriver == NULL) {\r | |
411 | return EFI_NOT_FOUND;\r | |
412 | }\r | |
413 | //\r | |
414 | // Make removal an atomic operation with the lock\r | |
415 | //\r | |
416 | EfiAcquireLock (&Private->DataLock);\r | |
417 | RemoveEntryList (&FilterDriver->Link);\r | |
418 | EfiReleaseLock (&Private->DataLock);\r | |
419 | \r | |
420 | return EFI_SUCCESS;\r | |
421 | }\r | |
422 | \r | |
423 | /**\r | |
424 | Search the Head list for a EFI_DATA_HUB_FILTER_DRIVER member that\r | |
425 | represents Event and return it.\r | |
426 | \r | |
427 | @param Head - Head of dual linked list of EFI_DATA_HUB_FILTER_DRIVER\r | |
428 | structures.\r | |
429 | \r | |
430 | @param Event - Event to be search for in the Head list.\r | |
431 | \r | |
432 | @retval EFI_DATA_HUB_FILTER_DRIVER - Returned if Event stored in the\r | |
433 | Head doubly linked list.\r | |
434 | \r | |
435 | @retval NULL - If Event is not in the list\r | |
436 | \r | |
437 | **/\r | |
438 | DATA_HUB_FILTER_DRIVER *\r | |
439 | FindFilterDriverByEvent (\r | |
440 | IN LIST_ENTRY *Head,\r | |
441 | IN EFI_EVENT Event\r | |
442 | )\r | |
443 | \r | |
444 | {\r | |
445 | DATA_HUB_FILTER_DRIVER *FilterEntry;\r | |
446 | LIST_ENTRY *Link;\r | |
447 | \r | |
448 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r | |
449 | FilterEntry = FILTER_ENTRY_FROM_LINK (Link);\r | |
450 | if (FilterEntry->Event == Event) {\r | |
451 | return FilterEntry;\r | |
452 | }\r | |
453 | }\r | |
454 | \r | |
455 | return NULL;\r | |
456 | }\r | |
457 | \r | |
458 | /**\r | |
459 | Search the Head doubly linked list for the passed in MTC. Return the \r | |
460 | matching element in Head and the MTC on the next entry.\r | |
461 | \r | |
462 | @param Head - Head of Data Log linked list.\r | |
463 | \r | |
464 | @param ClassFilter - Only match the MTC if it is in the same Class as the\r | |
465 | ClassFilter.\r | |
466 | \r | |
467 | @param PtrCurrentMTC - On IN contians MTC to search for. On OUT contians next\r | |
468 | MTC in the data log list or zero if at end of the list.\r | |
469 | \r | |
470 | @retval EFI_DATA_LOG_ENTRY - Return pointer to data log data from Head list.\r | |
471 | \r | |
472 | @retval NULL - If no data record exists.\r | |
473 | \r | |
474 | **/\r | |
475 | EFI_DATA_RECORD_HEADER *\r | |
476 | GetNextDataRecord (\r | |
477 | IN LIST_ENTRY *Head,\r | |
478 | IN UINT64 ClassFilter,\r | |
479 | IN OUT UINT64 *PtrCurrentMTC\r | |
480 | )\r | |
481 | \r | |
482 | {\r | |
483 | EFI_DATA_ENTRY *LogEntry;\r | |
484 | LIST_ENTRY *Link;\r | |
485 | BOOLEAN ReturnFirstEntry;\r | |
486 | EFI_DATA_RECORD_HEADER *Record;\r | |
487 | EFI_DATA_ENTRY *NextLogEntry;\r | |
488 | \r | |
489 | //\r | |
490 | // If MonotonicCount == 0 just return the first one\r | |
491 | //\r | |
492 | ReturnFirstEntry = (BOOLEAN) (*PtrCurrentMTC == 0);\r | |
493 | \r | |
494 | Record = NULL;\r | |
495 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r | |
496 | LogEntry = DATA_ENTRY_FROM_LINK (Link);\r | |
497 | if ((LogEntry->Record->DataRecordClass & ClassFilter) == 0) {\r | |
498 | //\r | |
499 | // Skip any entry that does not have the correct ClassFilter\r | |
500 | //\r | |
501 | continue;\r | |
502 | }\r | |
503 | \r | |
504 | if ((LogEntry->Record->LogMonotonicCount == *PtrCurrentMTC) || ReturnFirstEntry) {\r | |
505 | //\r | |
506 | // Return record to the user\r | |
507 | //\r | |
508 | Record = LogEntry->Record;\r | |
509 | \r | |
510 | //\r | |
511 | // Calculate the next MTC value. If there is no next entry set\r | |
512 | // MTC to zero.\r | |
513 | //\r | |
514 | *PtrCurrentMTC = 0;\r | |
515 | for (Link = Link->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r | |
516 | NextLogEntry = DATA_ENTRY_FROM_LINK (Link);\r | |
517 | if ((NextLogEntry->Record->DataRecordClass & ClassFilter) != 0) {\r | |
518 | //\r | |
519 | // Return the MTC of the next thing to search for if found\r | |
520 | //\r | |
521 | *PtrCurrentMTC = NextLogEntry->Record->LogMonotonicCount;\r | |
522 | break;\r | |
523 | }\r | |
524 | }\r | |
525 | //\r | |
526 | // Record found exit loop and return\r | |
527 | //\r | |
528 | break;\r | |
529 | }\r | |
530 | }\r | |
531 | \r | |
532 | return Record;\r | |
533 | }\r | |
534 | //\r | |
535 | // Module Global:\r | |
536 | // Since this driver will only ever produce one instance of the Logging Hub\r | |
537 | // protocol you are not required to dynamically allocate the PrivateData.\r | |
538 | //\r | |
539 | DATA_HUB_INSTANCE mPrivateData;\r | |
540 | \r | |
541 | /**\r | |
542 | \r | |
543 | Install Driver to produce Data Hub protocol. \r | |
544 | \r | |
545 | @param ImageHandle Module's image handle\r | |
546 | @param SystemTable Pointer of EFI_SYSTEM_TABLE\r | |
547 | \r | |
548 | \r | |
549 | @retval EFI_SUCCESS - Logging Hub protocol installed\r | |
550 | \r | |
551 | @retval Other - No protocol installed, unload driver.\r | |
552 | \r | |
553 | **/\r | |
554 | EFI_STATUS\r | |
555 | EFIAPI\r | |
556 | DataHubInstall (\r | |
557 | IN EFI_HANDLE ImageHandle,\r | |
558 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
559 | )\r | |
560 | {\r | |
561 | EFI_STATUS Status;\r | |
562 | UINT32 HighMontonicCount;\r | |
563 | \r | |
564 | mPrivateData.Signature = DATA_HUB_INSTANCE_SIGNATURE;\r | |
565 | mPrivateData.DataHub.LogData = DataHubLogData;\r | |
566 | mPrivateData.DataHub.GetNextRecord = DataHubGetNextRecord;\r | |
567 | mPrivateData.DataHub.RegisterFilterDriver = DataHubRegisterFilterDriver;\r | |
568 | mPrivateData.DataHub.UnregisterFilterDriver = DataHubUnregisterFilterDriver;\r | |
569 | \r | |
570 | //\r | |
571 | // Initialize Private Data in CORE_LOGGING_HUB_INSTANCE that is\r | |
572 | // required by this protocol\r | |
573 | //\r | |
574 | InitializeListHead (&mPrivateData.DataListHead);\r | |
575 | InitializeListHead (&mPrivateData.FilterDriverListHead);\r | |
576 | \r | |
577 | EfiInitializeLock (&mPrivateData.DataLock, TPL_NOTIFY);\r | |
578 | \r | |
579 | //\r | |
580 | // Make sure we get a bigger MTC number on every boot!\r | |
581 | //\r | |
582 | Status = gRT->GetNextHighMonotonicCount (&HighMontonicCount);\r | |
583 | if (EFI_ERROR (Status)) {\r | |
584 | //\r | |
585 | // if system service fails pick a sane value.\r | |
586 | //\r | |
587 | mPrivateData.GlobalMonotonicCount = 0;\r | |
588 | } else {\r | |
589 | mPrivateData.GlobalMonotonicCount = LShiftU64 ((UINT64) HighMontonicCount, 32);\r | |
590 | }\r | |
591 | //\r | |
592 | // Make a new handle and install the protocol\r | |
593 | //\r | |
594 | mPrivateData.Handle = NULL;\r | |
595 | Status = gBS->InstallProtocolInterface (\r | |
596 | &mPrivateData.Handle,\r | |
597 | &gEfiDataHubProtocolGuid,\r | |
598 | EFI_NATIVE_INTERFACE,\r | |
599 | &mPrivateData.DataHub\r | |
600 | );\r | |
601 | return Status;\r | |
602 | }\r | |
603 | \r |