3 Copyright (c) 2006, Intel Corporation
4 All rights reserved. This program and the accompanying materials
5 are licensed and made available under the terms and conditions of the BSD License
6 which accompanies this distribution. The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.php
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
20 Step #1 - When a FV protocol is added to the system every driver in the FV
21 is added to the mDiscoveredList. The SOR, Before, and After Depex are
22 pre-processed as drivers are added to the mDiscoveredList. If an Apriori
23 file exists in the FV those drivers are addeded to the
24 mScheduledQueue. The mFvHandleList is used to make sure a
25 FV is only processed once.
27 Step #2 - Dispatch. Remove driver from the mScheduledQueue and load and
28 start it. After mScheduledQueue is drained check the
29 mDiscoveredList to see if any item has a Depex that is ready to
30 be placed on the mScheduledQueue.
32 Step #3 - Adding to the mScheduledQueue requires that you process Before
33 and After dependencies. This is done recursively as the call to add
34 to the mScheduledQueue checks for Before and recursively adds
35 all Befores. It then addes the item that was passed in and then
36 processess the After dependecies by recursively calling the routine.
39 The rules for the dispatcher are in chapter 10 of the DXE CIS. Figure 10-3
40 is the state diagram for the DXE dispatcher
42 Depex - Dependency Expresion.
43 SOR - Schedule On Request - Don't schedule if this bit is set.
50 // The Driver List contains one copy of every driver that has been discovered.
51 // Items are never removed from the driver list. List of EFI_CORE_DRIVER_ENTRY
53 LIST_ENTRY mDiscoveredList
= INITIALIZE_LIST_HEAD_VARIABLE (mDiscoveredList
);
56 // Queue of drivers that are ready to dispatch. This queue is a subset of the
57 // mDiscoveredList.list of EFI_CORE_DRIVER_ENTRY.
59 LIST_ENTRY mScheduledQueue
= INITIALIZE_LIST_HEAD_VARIABLE (mScheduledQueue
);
62 // List of handles who's Fv's have been parsed and added to the mFwDriverList.
64 LIST_ENTRY mFvHandleList
= INITIALIZE_LIST_HEAD_VARIABLE (mFvHandleList
); // list of KNOWN_HANDLE
67 // Lock for mDiscoveredList, mScheduledQueue, gDispatcherRunning.
69 EFI_LOCK mDispatcherLock
= EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL
);
73 // Flag for the DXE Dispacher. TRUE if dispatcher is execuing.
75 BOOLEAN gDispatcherRunning
= FALSE
;
78 // Module globals to manage the FwVol registration notification event
80 EFI_EVENT mFwVolEvent
;
81 VOID
*mFwVolEventRegistration
;
84 // List of file types supported by dispatcher
86 static EFI_FV_FILETYPE mDxeFileTypes
[] = {
87 EFI_FV_FILETYPE_DRIVER
,
88 EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER
,
89 EFI_FV_FILETYPE_DXE_CORE
,
90 EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE
94 MEDIA_FW_VOL_FILEPATH_DEVICE_PATH File
;
95 EFI_DEVICE_PATH_PROTOCOL End
;
96 } FV_FILEPATH_DEVICE_PATH
;
98 FV_FILEPATH_DEVICE_PATH mFvDevicePath
;
102 // Function Prototypes
106 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
107 IN EFI_CORE_DRIVER_ENTRY
*InsertedDriverEntry
113 CoreFwVolEventProtocolNotify (
119 EFI_DEVICE_PATH_PROTOCOL
*
121 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
122 IN EFI_HANDLE FvHandle
,
123 IN EFI_GUID
*DriverName
128 CoreAddToDriverList (
129 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
130 IN EFI_HANDLE FvHandle
,
131 IN EFI_GUID
*DriverName
136 CoreProcessFvImageFile (
137 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
138 IN EFI_HANDLE FvHandle
,
139 IN EFI_GUID
*DriverName
144 CoreAcquireDispatcherLock (
151 Enter critical section by gaining lock on mDispatcherLock
164 CoreAcquireLock (&mDispatcherLock
);
169 CoreReleaseDispatcherLock (
176 Exit critical section by releasing lock on mDispatcherLock
188 CoreReleaseLock (&mDispatcherLock
);
193 CoreGetDepexSectionAndPreProccess (
194 IN EFI_CORE_DRIVER_ENTRY
*DriverEntry
200 Read Depex and pre-process the Depex for Before and After. If Section Extraction
201 protocol returns an error via ReadSection defer the reading of the Depex.
205 DriverEntry - Driver to work on.
209 EFI_SUCCESS - Depex read and preprossesed
211 EFI_PROTOCOL_ERROR - The section extraction protocol returned an error and
212 Depex reading needs to be retried.
214 Other Error - DEPEX not found.
219 EFI_SECTION_TYPE SectionType
;
220 UINT32 AuthenticationStatus
;
221 EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
;
224 Fv
= DriverEntry
->Fv
;
227 // Grab Depex info, it will never be free'ed.
229 SectionType
= EFI_SECTION_DXE_DEPEX
;
230 Status
= Fv
->ReadSection (
232 &DriverEntry
->FileName
,
236 (UINTN
*)&DriverEntry
->DepexSize
,
237 &AuthenticationStatus
239 if (EFI_ERROR (Status
)) {
240 if (Status
== EFI_PROTOCOL_ERROR
) {
242 // The section extraction protocol failed so set protocol error flag
244 DriverEntry
->DepexProtocolError
= TRUE
;
247 // If no Depex assume EFI 1.1 driver model
249 DriverEntry
->Depex
= NULL
;
250 DriverEntry
->Dependent
= TRUE
;
251 DriverEntry
->DepexProtocolError
= FALSE
;
255 // Set Before, After, and Unrequested state information based on Depex
256 // Driver will be put in Dependent or Unrequested state
258 CorePreProcessDepex (DriverEntry
);
259 DriverEntry
->DepexProtocolError
= FALSE
;
269 IN EFI_HANDLE FirmwareVolumeHandle
,
270 IN EFI_GUID
*DriverName
276 Check every driver and locate a matching one. If the driver is found, the Unrequested
277 state flag is cleared.
281 FirmwareVolumeHandle - The handle of the Firmware Volume that contains the firmware
282 file specified by DriverName.
284 DriverName - The Driver name to put in the Dependent state.
288 EFI_SUCCESS - The DriverName was found and it's SOR bit was cleared
290 EFI_NOT_FOUND - The DriverName does not exist or it's SOR bit was not set.
295 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
298 // Check every driver
300 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
301 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
302 if (DriverEntry
->FvHandle
== FirmwareVolumeHandle
&&
303 DriverEntry
->Unrequested
&&
304 CompareGuid (DriverName
, &DriverEntry
->FileName
)) {
306 // Move the driver from the Unrequested to the Dependent state
308 CoreAcquireDispatcherLock ();
309 DriverEntry
->Unrequested
= FALSE
;
310 DriverEntry
->Dependent
= TRUE
;
311 CoreReleaseDispatcherLock ();
316 return EFI_NOT_FOUND
;
324 IN EFI_HANDLE FirmwareVolumeHandle
,
325 IN EFI_GUID
*DriverName
331 Convert a driver from the Untrused back to the Scheduled state
335 FirmwareVolumeHandle - The handle of the Firmware Volume that contains the firmware
336 file specified by DriverName.
338 DriverName - The Driver name to put in the Scheduled state
342 EFI_SUCCESS - The file was found in the untrusted state, and it was promoted
343 to the trusted state.
345 EFI_NOT_FOUND - The file was not found in the untrusted state.
350 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
353 // Check every driver
355 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
356 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
357 if (DriverEntry
->FvHandle
== FirmwareVolumeHandle
&&
358 DriverEntry
->Untrusted
&&
359 CompareGuid (DriverName
, &DriverEntry
->FileName
)) {
361 // Transition driver from Untrusted to Scheduled state.
363 CoreAcquireDispatcherLock ();
364 DriverEntry
->Untrusted
= FALSE
;
365 DriverEntry
->Scheduled
= TRUE
;
366 InsertTailList (&mScheduledQueue
, &DriverEntry
->ScheduledLink
);
367 CoreReleaseDispatcherLock ();
372 return EFI_NOT_FOUND
;
386 This is the main Dispatcher for DXE and it exits when there are no more
387 drivers to run. Drain the mScheduledQueue and load and start a PE
388 image for each driver. Search the mDiscoveredList to see if any driver can
389 be placed on the mScheduledQueue. If no drivers are placed on the
390 mScheduledQueue exit the function. On exit it is assumed the Bds()
391 will be called, and when the Bds() exits the Dispatcher will be called
400 EFI_ALREADY_STARTED - The DXE Dispatcher is already running
402 EFI_NOT_FOUND - No DXE Drivers were dispatched
404 EFI_SUCCESS - One or more DXE Drivers were dispatched
409 EFI_STATUS ReturnStatus
;
411 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
414 if (gDispatcherRunning
) {
416 // If the dispatcher is running don't let it be restarted.
418 return EFI_ALREADY_STARTED
;
421 gDispatcherRunning
= TRUE
;
424 ReturnStatus
= EFI_NOT_FOUND
;
427 // Drain the Scheduled Queue
429 while (!IsListEmpty (&mScheduledQueue
)) {
431 mScheduledQueue
.ForwardLink
,
432 EFI_CORE_DRIVER_ENTRY
,
434 EFI_CORE_DRIVER_ENTRY_SIGNATURE
438 // Load the DXE Driver image into memory. If the Driver was transitioned from
439 // Untrused to Scheduled it would have already been loaded so we may need to
440 // skip the LoadImage
442 if (DriverEntry
->ImageHandle
== NULL
) {
443 Status
= CoreLoadImage (
446 DriverEntry
->FvFileDevicePath
,
449 &DriverEntry
->ImageHandle
453 // Update the driver state to reflect that it's been loaded
455 if (EFI_ERROR (Status
)) {
456 CoreAcquireDispatcherLock ();
458 if (Status
== EFI_SECURITY_VIOLATION
) {
460 // Take driver from Scheduled to Untrused state
462 DriverEntry
->Untrusted
= TRUE
;
465 // The DXE Driver could not be loaded, and do not attempt to load or start it again.
466 // Take driver from Scheduled to Initialized.
468 // This case include the Never Trusted state if EFI_ACCESS_DENIED is returned
470 DriverEntry
->Initialized
= TRUE
;
473 DriverEntry
->Scheduled
= FALSE
;
474 RemoveEntryList (&DriverEntry
->ScheduledLink
);
476 CoreReleaseDispatcherLock ();
479 // If it's an error don't try the StartImage
485 CoreAcquireDispatcherLock ();
487 DriverEntry
->Scheduled
= FALSE
;
488 DriverEntry
->Initialized
= TRUE
;
489 RemoveEntryList (&DriverEntry
->ScheduledLink
);
491 CoreReleaseDispatcherLock ();
494 CoreReportProgressCodeSpecific (EFI_SOFTWARE_DXE_CORE
| EFI_SW_PC_INIT_BEGIN
, DriverEntry
->ImageHandle
);
495 Status
= CoreStartImage (DriverEntry
->ImageHandle
, NULL
, NULL
);
496 CoreReportProgressCodeSpecific (EFI_SOFTWARE_DXE_CORE
| EFI_SW_PC_INIT_END
, DriverEntry
->ImageHandle
);
498 ReturnStatus
= EFI_SUCCESS
;
502 // Search DriverList for items to place on Scheduled Queue
505 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
506 DriverEntry
= CR (Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
508 if (DriverEntry
->DepexProtocolError
){
510 // If Section Extraction Protocol did not let the Depex be read before retry the read
512 Status
= CoreGetDepexSectionAndPreProccess (DriverEntry
);
515 if (DriverEntry
->Dependent
) {
516 if (CoreIsSchedulable (DriverEntry
)) {
517 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
522 } while (ReadyToRun
);
524 gDispatcherRunning
= FALSE
;
531 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
532 IN EFI_CORE_DRIVER_ENTRY
*InsertedDriverEntry
538 Insert InsertedDriverEntry onto the mScheduledQueue. To do this you
539 must add any driver with a before dependency on InsertedDriverEntry first.
540 You do this by recursively calling this routine. After all the Befores are
541 processed you can add InsertedDriverEntry to the mScheduledQueue.
542 Then you can add any driver with an After dependency on InsertedDriverEntry
543 by recursively calling this routine.
547 InsertedDriverEntry - The driver to insert on the ScheduledLink Queue
556 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
559 // Process Before Dependency
561 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
562 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
563 if (DriverEntry
->Before
&& DriverEntry
->Dependent
) {
564 if (CompareGuid (&InsertedDriverEntry
->FileName
, &DriverEntry
->BeforeAfterGuid
)) {
566 // Recursively process BEFORE
568 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
574 // Convert driver from Dependent to Scheduled state
576 CoreAcquireDispatcherLock ();
578 InsertedDriverEntry
->Dependent
= FALSE
;
579 InsertedDriverEntry
->Scheduled
= TRUE
;
580 InsertTailList (&mScheduledQueue
, &InsertedDriverEntry
->ScheduledLink
);
582 CoreReleaseDispatcherLock ();
585 // Process After Dependency
587 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
588 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
589 if (DriverEntry
->After
&& DriverEntry
->Dependent
) {
590 if (CompareGuid (&InsertedDriverEntry
->FileName
, &DriverEntry
->BeforeAfterGuid
)) {
592 // Recursively process AFTER
594 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
603 IN EFI_HANDLE FvHandle
609 Return TRUE if the Fv has been processed, FALSE if not.
613 FvHandle - The handle of a FV that's being tested
617 TRUE - Fv protocol on FvHandle has been processed
619 FALSE - Fv protocol on FvHandle has not yet been processed
624 KNOWN_HANDLE
*KnownHandle
;
626 for (Link
= mFvHandleList
.ForwardLink
; Link
!= &mFvHandleList
; Link
= Link
->ForwardLink
) {
627 KnownHandle
= CR(Link
, KNOWN_HANDLE
, Link
, KNOWN_HANDLE_SIGNATURE
);
628 if (KnownHandle
->Handle
== FvHandle
) {
637 FvIsBeingProcesssed (
638 IN EFI_HANDLE FvHandle
644 Remember that Fv protocol on FvHandle has had it's drivers placed on the
645 mDiscoveredList. This fucntion adds entries on the mFvHandleList. Items are
646 never removed/freed from the mFvHandleList.
650 FvHandle - The handle of a FV that has been processed
658 KNOWN_HANDLE
*KnownHandle
;
660 KnownHandle
= CoreAllocateBootServicesPool (sizeof (KNOWN_HANDLE
));
661 ASSERT (KnownHandle
!= NULL
);
663 KnownHandle
->Signature
= KNOWN_HANDLE_SIGNATURE
;
664 KnownHandle
->Handle
= FvHandle
;
665 InsertTailList (&mFvHandleList
, &KnownHandle
->Link
);
671 EFI_DEVICE_PATH_PROTOCOL
*
673 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
674 IN EFI_HANDLE FvHandle
,
675 IN EFI_GUID
*DriverName
681 Convert FvHandle and DriverName into an EFI device path
685 Fv - Fv protocol, needed to read Depex info out of FLASH.
687 FvHandle - Handle for Fv, needed in the EFI_CORE_DRIVER_ENTRY so that the
688 PE image can be read out of the FV at a later time.
690 DriverName - Name of driver to add to mDiscoveredList.
694 Pointer to device path constructed from FvHandle and DriverName
699 EFI_DEVICE_PATH_PROTOCOL
*FvDevicePath
;
700 EFI_DEVICE_PATH_PROTOCOL
*FileNameDevicePath
;
703 // Remember the device path of the FV
705 Status
= CoreHandleProtocol (FvHandle
, &gEfiDevicePathProtocolGuid
, (VOID
**)&FvDevicePath
);
706 if (EFI_ERROR (Status
)) {
707 FileNameDevicePath
= NULL
;
710 // Build a device path to the file in the FV to pass into gBS->LoadImage
712 EfiInitializeFwVolDevicepathNode (&mFvDevicePath
.File
, DriverName
);
713 mFvDevicePath
.End
.Type
= EFI_END_ENTIRE_DEVICE_PATH
;
714 mFvDevicePath
.End
.SubType
= END_ENTIRE_DEVICE_PATH_SUBTYPE
;
715 SetDevicePathNodeLength (&mFvDevicePath
.End
, sizeof (EFI_DEVICE_PATH_PROTOCOL
));
717 FileNameDevicePath
= CoreAppendDevicePath (
719 (EFI_DEVICE_PATH_PROTOCOL
*)&mFvDevicePath
723 return FileNameDevicePath
;
729 CoreAddToDriverList (
730 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
731 IN EFI_HANDLE FvHandle
,
732 IN EFI_GUID
*DriverName
738 Add an entry to the mDiscoveredList. Allocate memory to store the DriverEntry,
739 and initilize any state variables. Read the Depex from the FV and store it
740 in DriverEntry. Pre-process the Depex to set the SOR, Before and After state.
741 The Discovered list is never free'ed and contains booleans that represent the
742 other possible DXE driver states.
746 Fv - Fv protocol, needed to read Depex info out of FLASH.
748 FvHandle - Handle for Fv, needed in the EFI_CORE_DRIVER_ENTRY so that the
749 PE image can be read out of the FV at a later time.
751 DriverName - Name of driver to add to mDiscoveredList.
755 EFI_SUCCESS - If driver was added to the mDiscoveredList.
757 EFI_ALREADY_STARTED - The driver has already been started. Only one DriverName
758 may be active in the system at any one time.
762 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
766 // Create the Driver Entry for the list. ZeroPool initializes lots of variables to
769 DriverEntry
= CoreAllocateZeroBootServicesPool (sizeof (EFI_CORE_DRIVER_ENTRY
));
770 ASSERT (DriverEntry
!= NULL
);
772 DriverEntry
->Signature
= EFI_CORE_DRIVER_ENTRY_SIGNATURE
;
773 CopyMem (&DriverEntry
->FileName
, DriverName
, sizeof (EFI_GUID
));
774 DriverEntry
->FvHandle
= FvHandle
;
775 DriverEntry
->Fv
= Fv
;
776 DriverEntry
->FvFileDevicePath
= CoreFvToDevicePath (Fv
, FvHandle
, DriverName
);
778 CoreGetDepexSectionAndPreProccess (DriverEntry
);
780 CoreAcquireDispatcherLock ();
782 InsertTailList (&mDiscoveredList
, &DriverEntry
->Link
);
784 CoreReleaseDispatcherLock ();
792 CoreProcessFvImageFile (
793 IN EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
,
794 IN EFI_HANDLE FvHandle
,
795 IN EFI_GUID
*DriverName
801 Get the driver from the FV through driver name, and produce a FVB protocol on FvHandle.
805 Fv - The FIRMWARE_VOLUME protocol installed on the FV.
806 FvHandle - The handle which FVB protocol installed on.
807 DriverName - The driver guid specified.
811 EFI_OUT_OF_RESOURCES - No enough memory or other resource.
813 EFI_VOLUME_CORRUPTED - Corrupted volume.
815 EFI_SUCCESS - Function successfully returned.
821 EFI_SECTION_TYPE SectionType
;
822 UINT32 AuthenticationStatus
;
827 // Read the first (and only the first) firmware volume section
829 SectionType
= EFI_SECTION_FIRMWARE_VOLUME_IMAGE
;
832 Status
= Fv
->ReadSection (
839 &AuthenticationStatus
841 if (!EFI_ERROR (Status
)) {
843 // Produce a FVB protocol for the file
845 Status
= ProduceFVBProtocolOnBuffer (
846 (EFI_PHYSICAL_ADDRESS
) (UINTN
) Buffer
,
853 if (EFI_ERROR (Status
) && (Buffer
!= NULL
)) {
855 // ReadSection or Produce FVB failed, Free data buffer
857 CoreFreePool (Buffer
);
867 CoreFwVolEventProtocolNotify (
875 Event notification that is fired every time a FV dispatch protocol is added.
876 More than one protocol may have been added when this event is fired, so you
877 must loop on CoreLocateHandle () to see how many protocols were added and
878 do the following to each FV:
880 If the Fv has already been processed, skip it. If the Fv has not been
881 processed then mark it as being processed, as we are about to process it.
883 Read the Fv and add any driver in the Fv to the mDiscoveredList.The
884 mDiscoveredList is never free'ed and contains variables that define
885 the other states the DXE driver transitions to..
887 While you are at it read the A Priori file into memory.
888 Place drivers in the A Priori list onto the mScheduledQueue.
892 Event - The Event that is being processed, not used.
894 Context - Event Context, not used.
903 EFI_STATUS GetNextFileStatus
;
904 EFI_STATUS SecurityStatus
;
905 EFI_FIRMWARE_VOLUME_PROTOCOL
*Fv
;
906 EFI_DEVICE_PATH_PROTOCOL
*FvDevicePath
;
911 EFI_FV_FILETYPE Type
;
912 EFI_FV_FILE_ATTRIBUTES Attributes
;
914 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
915 EFI_GUID
*AprioriFile
;
916 UINTN AprioriEntryCount
;
919 UINT32 AuthenticationStatus
;
924 BufferSize
= sizeof (EFI_HANDLE
);
925 Status
= CoreLocateHandle (
928 mFwVolEventRegistration
,
932 if (EFI_ERROR (Status
)) {
934 // If no more notification events exit
939 if (FvHasBeenProcessed (FvHandle
)) {
941 // This Fv has already been processed so lets skip it!
946 Status
= CoreHandleProtocol (FvHandle
, &gEfiFirmwareVolumeDispatchProtocolGuid
, (VOID
**)&Fv
);
947 if (EFI_ERROR (Status
)) {
949 // If no dispatch protocol then skip, but do not marked as being processed as it
950 // may show up later.
956 // Since we are about to process this Fv mark it as processed.
958 FvIsBeingProcesssed (FvHandle
);
961 Status
= CoreHandleProtocol (FvHandle
, &gEfiFirmwareVolumeProtocolGuid
, (VOID
**)&Fv
);
962 if (EFI_ERROR (Status
)) {
964 // The Handle has a FirmwareVolumeDispatch protocol and should also contiain
965 // a FirmwareVolume protocol thus we should never get here.
971 Status
= CoreHandleProtocol (FvHandle
, &gEfiDevicePathProtocolGuid
, (VOID
**)&FvDevicePath
);
972 if (EFI_ERROR (Status
)) {
974 // The Firmware volume doesn't have device path, can't be dispatched.
980 // Evaluate the authentication status of the Firmware Volume through
981 // Security Architectural Protocol
983 if (gSecurity
!= NULL
) {
984 SecurityStatus
= gSecurity
->FileAuthenticationState (
989 if (SecurityStatus
!= EFI_SUCCESS
) {
991 // Security check failed. The firmware volume should not be used for any purpose.
998 // Discover Drivers in FV and add them to the Discovered Driver List.
999 // Process EFI_FV_FILETYPE_DRIVER type and then EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER
1000 // EFI_FV_FILETYPE_DXE_CORE is processed to produce a Loaded Image protocol for the core
1001 // EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE is processed to create a Fvb
1003 for (Index
= 0; Index
< sizeof (mDxeFileTypes
)/sizeof (EFI_FV_FILETYPE
); Index
++) {
1005 // Initialize the search key
1009 Type
= mDxeFileTypes
[Index
];
1010 GetNextFileStatus
= Fv
->GetNextFile (
1018 if (!EFI_ERROR (GetNextFileStatus
)) {
1019 if (Type
== EFI_FV_FILETYPE_DXE_CORE
) {
1021 // If this is the DXE core fill in it's DevicePath & DeviceHandle
1023 if (gDxeCoreLoadedImage
->FilePath
== NULL
) {
1024 if (CompareGuid (&NameGuid
, gDxeCoreFileName
)) {
1026 // Maybe One specail Fv cantains only one DXE_CORE module, so its device path must
1027 // be initialized completely.
1029 EfiInitializeFwVolDevicepathNode (&mFvDevicePath
.File
, &NameGuid
);
1030 mFvDevicePath
.End
.Type
= EFI_END_ENTIRE_DEVICE_PATH
;
1031 mFvDevicePath
.End
.SubType
= END_ENTIRE_DEVICE_PATH_SUBTYPE
;
1032 SetDevicePathNodeLength (&mFvDevicePath
.End
, sizeof (EFI_DEVICE_PATH_PROTOCOL
));
1034 gDxeCoreLoadedImage
->FilePath
= CoreDuplicateDevicePath (
1035 (EFI_DEVICE_PATH_PROTOCOL
*)&mFvDevicePath
1037 gDxeCoreLoadedImage
->DeviceHandle
= FvHandle
;
1040 } else if (Type
== EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE
) {
1042 // Found a firmware volume image. Produce a firmware volume block
1043 // protocol for it so it gets dispatched from. This is usually a
1046 CoreProcessFvImageFile (Fv
, FvHandle
, &NameGuid
);
1049 // Transition driver from Undiscovered to Discovered state
1051 CoreAddToDriverList (Fv
, FvHandle
, &NameGuid
);
1054 } while (!EFI_ERROR (GetNextFileStatus
));
1058 // Read the array of GUIDs from the Apriori file if it is present in the firmware volume
1061 Status
= Fv
->ReadSection (
1066 (VOID
**)&AprioriFile
,
1068 &AuthenticationStatus
1070 if (!EFI_ERROR (Status
)) {
1071 AprioriEntryCount
= SizeOfBuffer
/ sizeof (EFI_GUID
);
1073 AprioriEntryCount
= 0;
1077 // Put drivers on Apriori List on the Scheduled queue. The Discovered List includes
1078 // drivers not in the current FV and these must be skipped since the a priori list
1079 // is only valid for the FV that it resided in.
1081 CoreAcquireDispatcherLock ();
1083 for (Index
= 0; Index
< AprioriEntryCount
; Index
++) {
1084 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
1085 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
1086 if (CompareGuid (&DriverEntry
->FileName
, &AprioriFile
[Index
]) &&
1087 (FvHandle
== DriverEntry
->FvHandle
)) {
1088 DriverEntry
->Dependent
= FALSE
;
1089 DriverEntry
->Scheduled
= TRUE
;
1090 InsertTailList (&mScheduledQueue
, &DriverEntry
->ScheduledLink
);
1096 CoreReleaseDispatcherLock ();
1099 // Free data allocated by Fv->ReadSection ()
1101 CoreFreePool (AprioriFile
);
1107 CoreInitializeDispatcher (
1112 Routine Description:
1114 Initialize the dispatcher. Initialize the notification function that runs when
1115 a FV protocol is added to the system.
1127 mFwVolEvent
= CoreCreateProtocolNotifyEvent (
1128 &gEfiFirmwareVolumeProtocolGuid
,
1130 CoreFwVolEventProtocolNotify
,
1132 &mFwVolEventRegistration
,
1138 // Function only used in debug builds
1141 CoreDisplayDiscoveredNotDispatched (
1146 Routine Description:
1148 Traverse the discovered list for any drivers that were discovered but not loaded
1149 because the dependency experessions evaluated to false
1162 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
1164 for (Link
= mDiscoveredList
.ForwardLink
;Link
!=&mDiscoveredList
; Link
= Link
->ForwardLink
) {
1165 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
1166 if (DriverEntry
->Dependent
) {
1167 DEBUG ((EFI_D_LOAD
, "Driver %g was discovered but not loaded!!\n", &DriverEntry
->FileName
));