FaultTolerantWriteSmm.c@ 85718

Last change on this file since 85718 was 85718, checked in by vboxsync, 4 years ago
Devices/EFI: Merge edk-stable202005 and make it build, bugref:4643
Property svn:eol-style set to `native`
File size: 21.8 KB

Line
1	/** @file
2
3	This is a simple fault tolerant write driver that is intended to use in the SMM environment.
4
5	This boot service protocol only provides fault tolerant write capability for
6	block devices. The protocol has internal non-volatile intermediate storage
7	of the data and private information. It should be able to recover
8	automatically from a critical fault, such as power failure.
9
10	The implementation uses an FTW (Fault Tolerant Write) Work Space.
11	This work space is a memory copy of the work space on the Working Block,
12	the size of the work space is the FTW_WORK_SPACE_SIZE bytes.
13
14	The work space stores each write record as EFI_FTW_RECORD structure.
15	The spare block stores the write buffer before write to the target block.
16
17	The write record has three states to specify the different phase of write operation.
18	1) WRITE_ALLOCATED is that the record is allocated in write space.
19	The information of write operation is stored in write record structure.
20	2) SPARE_COMPLETED is that the data from write buffer is writed into the spare block as the backup.
21	3) WRITE_COMPLETED is that the data is copied from the spare block to the target block.
22
23	This driver operates the data as the whole size of spare block.
24	It first read the SpareAreaLength data from the target block into the spare memory buffer.
25	Then copy the write buffer data into the spare memory buffer.
26	Then write the spare memory buffer into the spare block.
27	Final copy the data from the spare block to the target block.
28
29	To make this drive work well, the following conditions must be satisfied:
30	1. The write NumBytes data must be fit within Spare area.
31	Offset + NumBytes <= SpareAreaLength
32	2. The whole flash range has the same block size.
33	3. Working block is an area which contains working space in its last block and has the same size as spare block.
34	4. Working Block area must be in the single one Firmware Volume Block range which FVB protocol is produced on.
35	5. Spare area must be in the single one Firmware Volume Block range which FVB protocol is produced on.
36	6. Any write data area (SpareAreaLength Area) which the data will be written into must be
37	in the single one Firmware Volume Block range which FVB protocol is produced on.
38	7. If write data area (such as Variable range) is enlarged, the spare area range must be enlarged.
39	The spare area must be enough large to store the write data before write them into the target range.
40	If one of them is not satisfied, FtwWrite may fail.
41	Usually, Spare area only takes one block. That's SpareAreaLength = BlockSize, NumberOfSpareBlock = 1.
42
43	Caution: This module requires additional review when modified.
44	This driver need to make sure the CommBuffer is not in the SMRAM range.
45
46	Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
47	SPDX-License-Identifier: BSD-2-Clause-Patent
48
49	**/
50
51	#include <PiMm.h>
52	#include <Library/MmServicesTableLib.h>
53	#include <Library/BaseLib.h>
54	#include <Protocol/SmmSwapAddressRange.h>
55	#include "FaultTolerantWrite.h"
56	#include "FaultTolerantWriteSmmCommon.h"
57	#include <Protocol/MmEndOfDxe.h>
58
59	VOID *mFvbRegistration = NULL;
60	EFI_FTW_DEVICE *mFtwDevice = NULL;
61
62	///
63	/// The flag to indicate whether the platform has left the DXE phase of execution.
64	///
65	BOOLEAN mEndOfDxe = FALSE;
66
67	/**
68	Retrieve the SMM FVB protocol interface by HANDLE.
69
70	@param[in] FvBlockHandle The handle of SMM FVB protocol that provides services for
71	reading, writing, and erasing the target block.
72	@param[out] FvBlock The interface of SMM FVB protocol
73
74	@retval EFI_SUCCESS The interface information for the specified protocol was returned.
75	@retval EFI_UNSUPPORTED The device does not support the SMM FVB protocol.
76	@retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL.
77
78	**/
79	EFI_STATUS
80	FtwGetFvbByHandle (
81	IN EFI_HANDLE FvBlockHandle,
82	OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock
83	)
84	{
85	//
86	// To get the SMM FVB protocol interface on the handle
87	//
88	return gMmst->MmHandleProtocol (
89	FvBlockHandle,
90	&gEfiSmmFirmwareVolumeBlockProtocolGuid,
91	(VOID **) FvBlock
92	);
93	}
94
95	/**
96	Retrieve the SMM Swap Address Range protocol interface.
97
98	@param[out] SarProtocol The interface of SMM SAR protocol
99
100	@retval EFI_SUCCESS The SMM SAR protocol instance was found and returned in SarProtocol.
101	@retval EFI_NOT_FOUND The SMM SAR protocol instance was not found.
102	@retval EFI_INVALID_PARAMETER SarProtocol is NULL.
103
104	**/
105	EFI_STATUS
106	FtwGetSarProtocol (
107	OUT VOID **SarProtocol
108	)
109	{
110	EFI_STATUS Status;
111
112	//
113	// Locate Smm Swap Address Range protocol
114	//
115	Status = gMmst->MmLocateProtocol (
116	&gEfiSmmSwapAddressRangeProtocolGuid,
117	NULL,
118	SarProtocol
119	);
120	return Status;
121	}
122
123	/**
124	Function returns an array of handles that support the SMM FVB protocol
125	in a buffer allocated from pool.
126
127	@param[out] NumberHandles The number of handles returned in Buffer.
128	@param[out] Buffer A pointer to the buffer to return the requested
129	array of handles that support SMM FVB protocol.
130
131	@retval EFI_SUCCESS The array of handles was returned in Buffer, and the number of
132	handles in Buffer was returned in NumberHandles.
133	@retval EFI_NOT_FOUND No SMM FVB handle was found.
134	@retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results.
135	@retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL.
136
137	**/
138	EFI_STATUS
139	GetFvbCountAndBuffer (
140	OUT UINTN *NumberHandles,
141	OUT EFI_HANDLE **Buffer
142	)
143	{
144	EFI_STATUS Status;
145	UINTN BufferSize;
146
147	if ((NumberHandles == NULL) \|\| (Buffer == NULL)) {
148	return EFI_INVALID_PARAMETER;
149	}
150
151	BufferSize = 0;
152	*NumberHandles = 0;
153	*Buffer = NULL;
154	Status = gMmst->MmLocateHandle (
155	ByProtocol,
156	&gEfiSmmFirmwareVolumeBlockProtocolGuid,
157	NULL,
158	&BufferSize,
159	*Buffer
160	);
161	if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {
162	return EFI_NOT_FOUND;
163	}
164
165	*Buffer = AllocatePool (BufferSize);
166	if (*Buffer == NULL) {
167	return EFI_OUT_OF_RESOURCES;
168	}
169
170	Status = gMmst->MmLocateHandle (
171	ByProtocol,
172	&gEfiSmmFirmwareVolumeBlockProtocolGuid,
173	NULL,
174	&BufferSize,
175	*Buffer
176	);
177
178	*NumberHandles = BufferSize / sizeof(EFI_HANDLE);
179	if (EFI_ERROR(Status)) {
180	*NumberHandles = 0;
181	FreePool (*Buffer);
182	*Buffer = NULL;
183	}
184
185	return Status;
186	}
187
188
189	/**
190	Get the handle of the SMM FVB protocol by the FVB base address and attributes.
191
192	@param[in] Address The base address of SMM FVB protocol.
193	@param[in] Attributes The attributes of the SMM FVB protocol.
194	@param[out] SmmFvbHandle The handle of the SMM FVB protocol.
195
196	@retval EFI_SUCCESS The FVB handle is found.
197	@retval EFI_ABORTED The FVB protocol is not found.
198
199	**/
200	EFI_STATUS
201	GetFvbByAddressAndAttribute (
202	IN EFI_PHYSICAL_ADDRESS Address,
203	IN EFI_FVB_ATTRIBUTES_2 Attributes,
204	OUT EFI_HANDLE *SmmFvbHandle
205	)
206	{
207	EFI_STATUS Status;
208	EFI_HANDLE *HandleBuffer;
209	UINTN HandleCount;
210	UINTN Index;
211	EFI_PHYSICAL_ADDRESS FvbBaseAddress;
212	EFI_FVB_ATTRIBUTES_2 FvbAttributes;
213	EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
214
215	HandleBuffer = NULL;
216
217	//
218	// Locate all handles of SMM Fvb protocol.
219	//
220	Status = GetFvbCountAndBuffer (&HandleCount, &HandleBuffer);
221	if (EFI_ERROR (Status)) {
222	return EFI_ABORTED;
223	}
224
225	//
226	// Find the proper SMM Fvb handle by the address and attributes.
227	//
228	for (Index = 0; Index < HandleCount; Index++) {
229	Status = FtwGetFvbByHandle (HandleBuffer[Index], &Fvb);
230	if (EFI_ERROR (Status)) {
231	break;
232	}
233	//
234	// Compare the address.
235	//
236	Status = Fvb->GetPhysicalAddress (Fvb, &FvbBaseAddress);
237	if (EFI_ERROR (Status)) {
238	continue;
239	}
240	if (Address != FvbBaseAddress) {
241	continue;
242	}
243
244	//
245	// Compare the attribute.
246	//
247	Status = Fvb->GetAttributes (Fvb, &FvbAttributes);
248	if (EFI_ERROR (Status)) {
249	continue;
250	}
251	if (Attributes != FvbAttributes) {
252	continue;
253	}
254
255	//
256	// Found the proper FVB handle.
257	//
258	*SmmFvbHandle = HandleBuffer[Index];
259	FreePool (HandleBuffer);
260	return EFI_SUCCESS;
261	}
262
263	FreePool (HandleBuffer);
264	return EFI_ABORTED;
265	}
266
267	/**
268	Communication service SMI Handler entry.
269
270	This SMI handler provides services for the fault tolerant write wrapper driver.
271
272	Caution: This function requires additional review when modified.
273	This driver need to make sure the CommBuffer is not in the SMRAM range.
274	Also in FTW_FUNCTION_GET_LAST_WRITE case, check SmmFtwGetLastWriteHeader->Data +
275	SmmFtwGetLastWriteHeader->PrivateDataSize within communication buffer.
276
277	@param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
278	@param[in] RegisterContext Points to an optional handler context which was specified when the
279	handler was registered.
280	@param[in, out] CommBuffer A pointer to a collection of data in memory that will be conveyed
281	from a non-SMM environment into an SMM environment.
282	@param[in, out] CommBufferSize The size of the CommBuffer.
283
284	@retval EFI_SUCCESS The interrupt was handled and quiesced. No other handlers
285	should still be called.
286	@retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other handlers should
287	still be called.
288	@retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other handlers should still
289	be called.
290	@retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.
291
292	**/
293	EFI_STATUS
294	EFIAPI
295	SmmFaultTolerantWriteHandler (
296	IN EFI_HANDLE DispatchHandle,
297	IN CONST VOID *RegisterContext,
298	IN OUT VOID *CommBuffer,
299	IN OUT UINTN *CommBufferSize
300	)
301	{
302	EFI_STATUS Status;
303	SMM_FTW_COMMUNICATE_FUNCTION_HEADER *SmmFtwFunctionHeader;
304	SMM_FTW_GET_MAX_BLOCK_SIZE_HEADER *SmmGetMaxBlockSizeHeader;
305	SMM_FTW_ALLOCATE_HEADER *SmmFtwAllocateHeader;
306	SMM_FTW_WRITE_HEADER *SmmFtwWriteHeader;
307	SMM_FTW_RESTART_HEADER *SmmFtwRestartHeader;
308	SMM_FTW_GET_LAST_WRITE_HEADER *SmmFtwGetLastWriteHeader;
309	VOID *PrivateData;
310	EFI_HANDLE SmmFvbHandle;
311	UINTN InfoSize;
312	UINTN CommBufferPayloadSize;
313	UINTN PrivateDataSize;
314	UINTN Length;
315	UINTN TempCommBufferSize;
316
317	//
318	// If input is invalid, stop processing this SMI
319	//
320	if (CommBuffer == NULL \|\| CommBufferSize == NULL) {
321	return EFI_SUCCESS;
322	}
323
324	TempCommBufferSize = *CommBufferSize;
325
326	if (TempCommBufferSize < SMM_FTW_COMMUNICATE_HEADER_SIZE) {
327	DEBUG ((EFI_D_ERROR, "SmmFtwHandler: SMM communication buffer size invalid!\n"));
328	return EFI_SUCCESS;
329	}
330	CommBufferPayloadSize = TempCommBufferSize - SMM_FTW_COMMUNICATE_HEADER_SIZE;
331
332	if (!FtwSmmIsBufferOutsideSmmValid ((UINTN)CommBuffer, TempCommBufferSize)) {
333	DEBUG ((EFI_D_ERROR, "SmmFtwHandler: SMM communication buffer in SMRAM or overflow!\n"));
334	return EFI_SUCCESS;
335	}
336
337	SmmFtwFunctionHeader = (SMM_FTW_COMMUNICATE_FUNCTION_HEADER *)CommBuffer;
338
339	if (mEndOfDxe) {
340	//
341	// It will be not safe to expose the operations after End Of Dxe.
342	//
343	DEBUG ((EFI_D_ERROR, "SmmFtwHandler: Not safe to do the operation: %x after End Of Dxe, so access denied!\n", SmmFtwFunctionHeader->Function));
344	SmmFtwFunctionHeader->ReturnStatus = EFI_ACCESS_DENIED;
345	return EFI_SUCCESS;
346	}
347
348	switch (SmmFtwFunctionHeader->Function) {
349	case FTW_FUNCTION_GET_MAX_BLOCK_SIZE:
350	if (CommBufferPayloadSize < sizeof (SMM_FTW_GET_MAX_BLOCK_SIZE_HEADER)) {
351	DEBUG ((EFI_D_ERROR, "GetMaxBlockSize: SMM communication buffer size invalid!\n"));
352	return EFI_SUCCESS;
353	}
354	SmmGetMaxBlockSizeHeader = (SMM_FTW_GET_MAX_BLOCK_SIZE_HEADER *) SmmFtwFunctionHeader->Data;
355
356	Status = FtwGetMaxBlockSize (
357	&mFtwDevice->FtwInstance,
358	&SmmGetMaxBlockSizeHeader->BlockSize
359	);
360	break;
361
362	case FTW_FUNCTION_ALLOCATE:
363	if (CommBufferPayloadSize < sizeof (SMM_FTW_ALLOCATE_HEADER)) {
364	DEBUG ((EFI_D_ERROR, "Allocate: SMM communication buffer size invalid!\n"));
365	return EFI_SUCCESS;
366	}
367	SmmFtwAllocateHeader = (SMM_FTW_ALLOCATE_HEADER *) SmmFtwFunctionHeader->Data;
368	Status = FtwAllocate (
369	&mFtwDevice->FtwInstance,
370	&SmmFtwAllocateHeader->CallerId,
371	SmmFtwAllocateHeader->PrivateDataSize,
372	SmmFtwAllocateHeader->NumberOfWrites
373	);
374	break;
375
376	case FTW_FUNCTION_WRITE:
377	if (CommBufferPayloadSize < OFFSET_OF (SMM_FTW_WRITE_HEADER, Data)) {
378	DEBUG ((EFI_D_ERROR, "Write: SMM communication buffer size invalid!\n"));
379	return EFI_SUCCESS;
380	}
381	SmmFtwWriteHeader = (SMM_FTW_WRITE_HEADER *) SmmFtwFunctionHeader->Data;
382	Length = SmmFtwWriteHeader->Length;
383	PrivateDataSize = SmmFtwWriteHeader->PrivateDataSize;
384	if (((UINTN)(~0) - Length < OFFSET_OF (SMM_FTW_WRITE_HEADER, Data)) \|\|
385	((UINTN)(~0) - PrivateDataSize < OFFSET_OF (SMM_FTW_WRITE_HEADER, Data) + Length)) {
386	//
387	// Prevent InfoSize overflow
388	//
389	Status = EFI_ACCESS_DENIED;
390	break;
391	}
392	InfoSize = OFFSET_OF (SMM_FTW_WRITE_HEADER, Data) + Length + PrivateDataSize;
393
394	//
395	// SMRAM range check already covered before
396	//
397	if (InfoSize > CommBufferPayloadSize) {
398	DEBUG ((EFI_D_ERROR, "Write: Data size exceed communication buffer size limit!\n"));
399	Status = EFI_ACCESS_DENIED;
400	break;
401	}
402
403	if (PrivateDataSize == 0) {
404	PrivateData = NULL;
405	} else {
406	PrivateData = (VOID *)&SmmFtwWriteHeader->Data[Length];
407	}
408	Status = GetFvbByAddressAndAttribute (
409	SmmFtwWriteHeader->FvbBaseAddress,
410	SmmFtwWriteHeader->FvbAttributes,
411	&SmmFvbHandle
412	);
413	if (!EFI_ERROR (Status)) {
414	//
415	// The SpeculationBarrier() call here is to ensure the previous
416	// range/content checks for the CommBuffer have been completed before
417	// calling into FtwWrite().
418	//
419	SpeculationBarrier ();
420	Status = FtwWrite(
421	&mFtwDevice->FtwInstance,
422	SmmFtwWriteHeader->Lba,
423	SmmFtwWriteHeader->Offset,
424	Length,
425	PrivateData,
426	SmmFvbHandle,
427	SmmFtwWriteHeader->Data
428	);
429	}
430	break;
431
432	case FTW_FUNCTION_RESTART:
433	if (CommBufferPayloadSize < sizeof (SMM_FTW_RESTART_HEADER)) {
434	DEBUG ((EFI_D_ERROR, "Restart: SMM communication buffer size invalid!\n"));
435	return EFI_SUCCESS;
436	}
437	SmmFtwRestartHeader = (SMM_FTW_RESTART_HEADER *) SmmFtwFunctionHeader->Data;
438	Status = GetFvbByAddressAndAttribute (
439	SmmFtwRestartHeader->FvbBaseAddress,
440	SmmFtwRestartHeader->FvbAttributes,
441	&SmmFvbHandle
442	);
443	if (!EFI_ERROR (Status)) {
444	Status = FtwRestart (&mFtwDevice->FtwInstance, SmmFvbHandle);
445	}
446	break;
447
448	case FTW_FUNCTION_ABORT:
449	Status = FtwAbort (&mFtwDevice->FtwInstance);
450	break;
451
452	case FTW_FUNCTION_GET_LAST_WRITE:
453	if (CommBufferPayloadSize < OFFSET_OF (SMM_FTW_GET_LAST_WRITE_HEADER, Data)) {
454	DEBUG ((EFI_D_ERROR, "GetLastWrite: SMM communication buffer size invalid!\n"));
455	return EFI_SUCCESS;
456	}
457	SmmFtwGetLastWriteHeader = (SMM_FTW_GET_LAST_WRITE_HEADER *) SmmFtwFunctionHeader->Data;
458	PrivateDataSize = SmmFtwGetLastWriteHeader->PrivateDataSize;
459	if ((UINTN)(~0) - PrivateDataSize < OFFSET_OF (SMM_FTW_GET_LAST_WRITE_HEADER, Data)){
460	//
461	// Prevent InfoSize overflow
462	//
463	Status = EFI_ACCESS_DENIED;
464	break;
465	}
466	InfoSize = OFFSET_OF (SMM_FTW_GET_LAST_WRITE_HEADER, Data) + PrivateDataSize;
467
468	//
469	// SMRAM range check already covered before
470	//
471	if (InfoSize > CommBufferPayloadSize) {
472	DEBUG ((EFI_D_ERROR, "Data size exceed communication buffer size limit!\n"));
473	Status = EFI_ACCESS_DENIED;
474	break;
475	}
476
477	Status = FtwGetLastWrite (
478	&mFtwDevice->FtwInstance,
479	&SmmFtwGetLastWriteHeader->CallerId,
480	&SmmFtwGetLastWriteHeader->Lba,
481	&SmmFtwGetLastWriteHeader->Offset,
482	&SmmFtwGetLastWriteHeader->Length,
483	&PrivateDataSize,
484	(VOID *)SmmFtwGetLastWriteHeader->Data,
485	&SmmFtwGetLastWriteHeader->Complete
486	);
487	SmmFtwGetLastWriteHeader->PrivateDataSize = PrivateDataSize;
488	break;
489
490	default:
491	Status = EFI_UNSUPPORTED;
492	}
493
494	SmmFtwFunctionHeader->ReturnStatus = Status;
495
496	return EFI_SUCCESS;
497	}
498
499
500	/**
501	SMM Firmware Volume Block Protocol notification event handler.
502
503	@param[in] Protocol Points to the protocol's unique identifier
504	@param[in] Interface Points to the interface instance
505	@param[in] Handle The handle on which the interface was installed
506
507	@retval EFI_SUCCESS SmmEventCallback runs successfully
508
509	**/
510	EFI_STATUS
511	EFIAPI
512	FvbNotificationEvent (
513	IN CONST EFI_GUID *Protocol,
514	IN VOID *Interface,
515	IN EFI_HANDLE Handle
516	)
517	{
518	EFI_STATUS Status;
519	EFI_SMM_FAULT_TOLERANT_WRITE_PROTOCOL *FtwProtocol;
520	EFI_HANDLE SmmFtwHandle;
521
522	//
523	// Just return to avoid install SMM FaultTolerantWriteProtocol again
524	// if SMM Fault Tolerant Write protocol had been installed.
525	//
526	Status = gMmst->MmLocateProtocol (
527	&gEfiSmmFaultTolerantWriteProtocolGuid,
528	NULL,
529	(VOID **) &FtwProtocol
530	);
531	if (!EFI_ERROR (Status)) {
532	return EFI_SUCCESS;
533	}
534
535	//
536	// Found proper FVB protocol and initialize FtwDevice for protocol installation
537	//
538	Status = InitFtwProtocol (mFtwDevice);
539	if (EFI_ERROR(Status)) {
540	return Status;
541	}
542
543	//
544	// Install protocol interface
545	//
546	Status = gMmst->MmInstallProtocolInterface (
547	&mFtwDevice->Handle,
548	&gEfiSmmFaultTolerantWriteProtocolGuid,
549	EFI_NATIVE_INTERFACE,
550	&mFtwDevice->FtwInstance
551	);
552	ASSERT_EFI_ERROR (Status);
553
554	///
555	/// Register SMM FTW SMI handler
556	///
557	Status = gMmst->MmiHandlerRegister (SmmFaultTolerantWriteHandler, &gEfiSmmFaultTolerantWriteProtocolGuid, &SmmFtwHandle);
558	ASSERT_EFI_ERROR (Status);
559
560	//
561	// Notify the Ftw wrapper driver SMM Ftw is ready
562	//
563	FtwNotifySmmReady ();
564
565	return EFI_SUCCESS;
566	}
567
568	/**
569	SMM END_OF_DXE protocol notification event handler.
570
571	@param Protocol Points to the protocol's unique identifier
572	@param Interface Points to the interface instance
573	@param Handle The handle on which the interface was installed
574
575	@retval EFI_SUCCESS SmmEndOfDxeCallback runs successfully
576
577	**/
578	EFI_STATUS
579	EFIAPI
580	MmEndOfDxeCallback (
581	IN CONST EFI_GUID *Protocol,
582	IN VOID *Interface,
583	IN EFI_HANDLE Handle
584	)
585	{
586	mEndOfDxe = TRUE;
587	return EFI_SUCCESS;
588	}
589
590	/**
591	Shared entry point of the module
592
593	@retval EFI_SUCCESS The initialization finished successfully.
594	@retval EFI_OUT_OF_RESOURCES Allocate memory error
595	@retval EFI_INVALID_PARAMETER Workspace or Spare block does not exist
596	**/
597	EFI_STATUS
598	MmFaultTolerantWriteInitialize (
599	VOID
600	)
601	{
602	EFI_STATUS Status;
603	VOID *MmEndOfDxeRegistration;
604
605	//
606	// Allocate private data structure for SMM FTW protocol and do some initialization
607	//
608	Status = InitFtwDevice (&mFtwDevice);
609	if (EFI_ERROR(Status)) {
610	return Status;
611	}
612
613	//
614	// Register EFI_SMM_END_OF_DXE_PROTOCOL_GUID notify function.
615	//
616	Status = gMmst->MmRegisterProtocolNotify (
617	&gEfiMmEndOfDxeProtocolGuid,
618	MmEndOfDxeCallback,
619	&MmEndOfDxeRegistration
620	);
621	ASSERT_EFI_ERROR (Status);
622
623	//
624	// Register FvbNotificationEvent () notify function.
625	//
626	Status = gMmst->MmRegisterProtocolNotify (
627	&gEfiSmmFirmwareVolumeBlockProtocolGuid,
628	FvbNotificationEvent,
629	&mFvbRegistration
630	);
631	ASSERT_EFI_ERROR (Status);
632
633	FvbNotificationEvent (NULL, NULL, NULL);
634
635	return EFI_SUCCESS;
636	}

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source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c@ 85718

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