diff options
Diffstat (limited to 'StandaloneMmPkg/Core/Dispatcher.c')
| -rw-r--r-- | StandaloneMmPkg/Core/Dispatcher.c | 1071 |
1 files changed, 1071 insertions, 0 deletions
diff --git a/StandaloneMmPkg/Core/Dispatcher.c b/StandaloneMmPkg/Core/Dispatcher.c new file mode 100644 index 0000000000..8d009b4f80 --- /dev/null +++ b/StandaloneMmPkg/Core/Dispatcher.c @@ -0,0 +1,1071 @@ +/** @file
+ MM Driver Dispatcher.
+
+ Step #1 - When a FV protocol is added to the system every driver in the FV
+ is added to the mDiscoveredList. The Before, and After Depex are
+ pre-processed as drivers are added to the mDiscoveredList. If an Apriori
+ file exists in the FV those drivers are addeded to the
+ mScheduledQueue. The mFvHandleList is used to make sure a
+ FV is only processed once.
+
+ Step #2 - Dispatch. Remove driver from the mScheduledQueue and load and
+ start it. After mScheduledQueue is drained check the
+ mDiscoveredList to see if any item has a Depex that is ready to
+ be placed on the mScheduledQueue.
+
+ Step #3 - Adding to the mScheduledQueue requires that you process Before
+ and After dependencies. This is done recursively as the call to add
+ to the mScheduledQueue checks for Before and recursively adds
+ all Befores. It then addes the item that was passed in and then
+ processess the After dependecies by recursively calling the routine.
+
+ Dispatcher Rules:
+ The rules for the dispatcher are similar to the DXE dispatcher.
+
+ The rules for DXE dispatcher are in chapter 10 of the DXE CIS. Figure 10-3
+ is the state diagram for the DXE dispatcher
+
+ Depex - Dependency Expresion.
+
+ Copyright (c) 2014, Hewlett-Packard Development Company, L.P.
+ Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
+
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License which accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "StandaloneMmCore.h"
+
+//
+// MM Dispatcher Data structures
+//
+#define KNOWN_HANDLE_SIGNATURE SIGNATURE_32('k','n','o','w')
+
+typedef struct {
+ UINTN Signature;
+ LIST_ENTRY Link; // mFvHandleList
+ EFI_HANDLE Handle;
+} KNOWN_HANDLE;
+
+//
+// Function Prototypes
+//
+
+EFI_STATUS
+MmCoreFfsFindMmDriver (
+ IN EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader
+ );
+
+/**
+ Insert InsertedDriverEntry onto the mScheduledQueue. To do this you
+ must add any driver with a before dependency on InsertedDriverEntry first.
+ You do this by recursively calling this routine. After all the Befores are
+ processed you can add InsertedDriverEntry to the mScheduledQueue.
+ Then you can add any driver with an After dependency on InsertedDriverEntry
+ by recursively calling this routine.
+
+ @param InsertedDriverEntry The driver to insert on the ScheduledLink Queue
+
+**/
+VOID
+MmInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
+ IN EFI_MM_DRIVER_ENTRY *InsertedDriverEntry
+ );
+
+//
+// The Driver List contains one copy of every driver that has been discovered.
+// Items are never removed from the driver list. List of EFI_MM_DRIVER_ENTRY
+//
+LIST_ENTRY mDiscoveredList = INITIALIZE_LIST_HEAD_VARIABLE (mDiscoveredList);
+
+//
+// Queue of drivers that are ready to dispatch. This queue is a subset of the
+// mDiscoveredList.list of EFI_MM_DRIVER_ENTRY.
+//
+LIST_ENTRY mScheduledQueue = INITIALIZE_LIST_HEAD_VARIABLE (mScheduledQueue);
+
+//
+// List of handles who's Fv's have been parsed and added to the mFwDriverList.
+//
+LIST_ENTRY mFvHandleList = INITIALIZE_LIST_HEAD_VARIABLE (mFvHandleList);
+
+//
+// Flag for the MM Dispacher. TRUE if dispatcher is execuing.
+//
+BOOLEAN gDispatcherRunning = FALSE;
+
+//
+// Flag for the MM Dispacher. TRUE if there is one or more MM drivers ready to be dispatched
+//
+BOOLEAN gRequestDispatch = FALSE;
+
+//
+// The global variable is defined for Loading modules at fixed address feature to track the MM code
+// memory range usage. It is a bit mapped array in which every bit indicates the correspoding
+// memory page available or not.
+//
+GLOBAL_REMOVE_IF_UNREFERENCED UINT64 *mMmCodeMemoryRangeUsageBitMap=NULL;
+
+/**
+ To check memory usage bit map array to figure out if the memory range in which the image will be loaded
+ is available or not. If memory range is avaliable, the function will mark the correponding bits to 1
+ which indicates the memory range is used. The function is only invoked when load modules at fixed address
+ feature is enabled.
+
+ @param ImageBase The base addres the image will be loaded at.
+ @param ImageSize The size of the image
+
+ @retval EFI_SUCCESS The memory range the image will be loaded in is available
+ @retval EFI_NOT_FOUND The memory range the image will be loaded in is not available
+**/
+EFI_STATUS
+CheckAndMarkFixLoadingMemoryUsageBitMap (
+ IN EFI_PHYSICAL_ADDRESS ImageBase,
+ IN UINTN ImageSize
+ )
+{
+ UINT32 MmCodePageNumber;
+ UINT64 MmCodeSize;
+ EFI_PHYSICAL_ADDRESS MmCodeBase;
+ UINTN BaseOffsetPageNumber;
+ UINTN TopOffsetPageNumber;
+ UINTN Index;
+
+ //
+ // Build tool will calculate the smm code size and then patch the PcdLoadFixAddressMmCodePageNumber
+ //
+ MmCodePageNumber = 0;
+ MmCodeSize = EFI_PAGES_TO_SIZE (MmCodePageNumber);
+ MmCodeBase = gLoadModuleAtFixAddressMmramBase;
+
+ //
+ // If the memory usage bit map is not initialized, do it. Every bit in the array
+ // indicate the status of the corresponding memory page, available or not
+ //
+ if (mMmCodeMemoryRangeUsageBitMap == NULL) {
+ mMmCodeMemoryRangeUsageBitMap = AllocateZeroPool (((MmCodePageNumber / 64) + 1) * sizeof (UINT64));
+ }
+
+ //
+ // If the Dxe code memory range is not allocated or the bit map array allocation failed, return EFI_NOT_FOUND
+ //
+ if (mMmCodeMemoryRangeUsageBitMap == NULL) {
+ return EFI_NOT_FOUND;
+ }
+
+ //
+ // see if the memory range for loading the image is in the MM code range.
+ //
+ if (MmCodeBase + MmCodeSize < ImageBase + ImageSize || MmCodeBase > ImageBase) {
+ return EFI_NOT_FOUND;
+ }
+
+ //
+ // Test if the memory is avalaible or not.
+ //
+ BaseOffsetPageNumber = (UINTN)EFI_SIZE_TO_PAGES ((UINT32)(ImageBase - MmCodeBase));
+ TopOffsetPageNumber = (UINTN)EFI_SIZE_TO_PAGES ((UINT32)(ImageBase + ImageSize - MmCodeBase));
+ for (Index = BaseOffsetPageNumber; Index < TopOffsetPageNumber; Index ++) {
+ if ((mMmCodeMemoryRangeUsageBitMap[Index / 64] & LShiftU64 (1, (Index % 64))) != 0) {
+ //
+ // This page is already used.
+ //
+ return EFI_NOT_FOUND;
+ }
+ }
+
+ //
+ // Being here means the memory range is available. So mark the bits for the memory range
+ //
+ for (Index = BaseOffsetPageNumber; Index < TopOffsetPageNumber; Index ++) {
+ mMmCodeMemoryRangeUsageBitMap[Index / 64] |= LShiftU64 (1, (Index % 64));
+ }
+ return EFI_SUCCESS;
+}
+
+/**
+ Get the fixed loading address from image header assigned by build tool. This function only be called
+ when Loading module at Fixed address feature enabled.
+
+ @param ImageContext Pointer to the image context structure that describes the PE/COFF
+ image that needs to be examined by this function.
+ @retval EFI_SUCCESS An fixed loading address is assigned to this image by build tools .
+ @retval EFI_NOT_FOUND The image has no assigned fixed loadding address.
+
+**/
+EFI_STATUS
+GetPeCoffImageFixLoadingAssignedAddress(
+ IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
+ )
+{
+ UINTN SectionHeaderOffset;
+ EFI_STATUS Status;
+ EFI_IMAGE_SECTION_HEADER SectionHeader;
+ EFI_IMAGE_OPTIONAL_HEADER_UNION *ImgHdr;
+ EFI_PHYSICAL_ADDRESS FixLoadingAddress;
+ UINT16 Index;
+ UINTN Size;
+ UINT16 NumberOfSections;
+ UINT64 ValueInSectionHeader;
+
+ FixLoadingAddress = 0;
+ Status = EFI_NOT_FOUND;
+
+ //
+ // Get PeHeader pointer
+ //
+ ImgHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)((CHAR8* )ImageContext->Handle + ImageContext->PeCoffHeaderOffset);
+ SectionHeaderOffset = ImageContext->PeCoffHeaderOffset + sizeof (UINT32) + sizeof (EFI_IMAGE_FILE_HEADER) +
+ ImgHdr->Pe32.FileHeader.SizeOfOptionalHeader;
+ NumberOfSections = ImgHdr->Pe32.FileHeader.NumberOfSections;
+
+ //
+ // Get base address from the first section header that doesn't point to code section.
+ //
+ for (Index = 0; Index < NumberOfSections; Index++) {
+ //
+ // Read section header from file
+ //
+ Size = sizeof (EFI_IMAGE_SECTION_HEADER);
+ Status = ImageContext->ImageRead (
+ ImageContext->Handle,
+ SectionHeaderOffset,
+ &Size,
+ &SectionHeader
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = EFI_NOT_FOUND;
+
+ if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_CNT_CODE) == 0) {
+ //
+ // Build tool will save the address in PointerToRelocations & PointerToLineNumbers fields
+ // in the first section header that doesn't point to code section in image header. So there
+ // is an assumption that when the feature is enabled, if a module with a loading address
+ // assigned by tools, the PointerToRelocations & PointerToLineNumbers fields should not be
+ // Zero, or else, these 2 fields should be set to Zero
+ //
+ ValueInSectionHeader = ReadUnaligned64 ((UINT64*)&SectionHeader.PointerToRelocations);
+ if (ValueInSectionHeader != 0) {
+ //
+ // Found first section header that doesn't point to code section in which build tool saves the
+ // offset to SMRAM base as image base in PointerToRelocations & PointerToLineNumbers fields
+ //
+ FixLoadingAddress = (EFI_PHYSICAL_ADDRESS)(gLoadModuleAtFixAddressMmramBase + (INT64)ValueInSectionHeader);
+ //
+ // Check if the memory range is available.
+ //
+ Status = CheckAndMarkFixLoadingMemoryUsageBitMap (FixLoadingAddress, (UINTN)(ImageContext->ImageSize + ImageContext->SectionAlignment));
+ if (!EFI_ERROR(Status)) {
+ //
+ // The assigned address is valid. Return the specified loading address
+ //
+ ImageContext->ImageAddress = FixLoadingAddress;
+ }
+ }
+ break;
+ }
+ SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);
+ }
+ DEBUG ((DEBUG_INFO|DEBUG_LOAD, "LOADING MODULE FIXED INFO: Loading module at fixed address %x, Status = %r\n",
+ FixLoadingAddress, Status));
+ return Status;
+}
+/**
+ Loads an EFI image into SMRAM.
+
+ @param DriverEntry EFI_MM_DRIVER_ENTRY instance
+
+ @return EFI_STATUS
+
+**/
+EFI_STATUS
+EFIAPI
+MmLoadImage (
+ IN OUT EFI_MM_DRIVER_ENTRY *DriverEntry
+ )
+{
+ VOID *Buffer;
+ UINTN PageCount;
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS DstBuffer;
+ PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;
+
+ DEBUG ((DEBUG_INFO, "MmLoadImage - %g\n", &DriverEntry->FileName));
+
+ Buffer = AllocateCopyPool (DriverEntry->Pe32DataSize, DriverEntry->Pe32Data);
+ if (Buffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ Status = EFI_SUCCESS;
+
+ //
+ // Initialize ImageContext
+ //
+ ImageContext.Handle = Buffer;
+ ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory;
+
+ //
+ // Get information about the image being loaded
+ //
+ Status = PeCoffLoaderGetImageInfo (&ImageContext);
+ if (EFI_ERROR (Status)) {
+ if (Buffer != NULL) {
+ MmFreePool (Buffer);
+ }
+ return Status;
+ }
+
+ PageCount = (UINTN)EFI_SIZE_TO_PAGES ((UINTN)ImageContext.ImageSize + ImageContext.SectionAlignment);
+ DstBuffer = (UINTN)(-1);
+
+ Status = MmAllocatePages (
+ AllocateMaxAddress,
+ EfiRuntimeServicesCode,
+ PageCount,
+ &DstBuffer
+ );
+ if (EFI_ERROR (Status)) {
+ if (Buffer != NULL) {
+ MmFreePool (Buffer);
+ }
+ return Status;
+ }
+
+ ImageContext.ImageAddress = (EFI_PHYSICAL_ADDRESS)DstBuffer;
+
+ //
+ // Align buffer on section boundry
+ //
+ ImageContext.ImageAddress += ImageContext.SectionAlignment - 1;
+ ImageContext.ImageAddress &= ~((EFI_PHYSICAL_ADDRESS)(ImageContext.SectionAlignment - 1));
+
+ //
+ // Load the image to our new buffer
+ //
+ Status = PeCoffLoaderLoadImage (&ImageContext);
+ if (EFI_ERROR (Status)) {
+ if (Buffer != NULL) {
+ MmFreePool (Buffer);
+ }
+ MmFreePages (DstBuffer, PageCount);
+ return Status;
+ }
+
+ //
+ // Relocate the image in our new buffer
+ //
+ Status = PeCoffLoaderRelocateImage (&ImageContext);
+ if (EFI_ERROR (Status)) {
+ if (Buffer != NULL) {
+ MmFreePool (Buffer);
+ }
+ MmFreePages (DstBuffer, PageCount);
+ return Status;
+ }
+
+ //
+ // Flush the instruction cache so the image data are written before we execute it
+ //
+ InvalidateInstructionCacheRange ((VOID *)(UINTN) ImageContext.ImageAddress, (UINTN) ImageContext.ImageSize);
+
+ //
+ // Save Image EntryPoint in DriverEntry
+ //
+ DriverEntry->ImageEntryPoint = ImageContext.EntryPoint;
+ DriverEntry->ImageBuffer = DstBuffer;
+ DriverEntry->NumberOfPage = PageCount;
+
+ if (mEfiSystemTable != NULL) {
+ Status = mEfiSystemTable->BootServices->AllocatePool (
+ EfiBootServicesData,
+ sizeof (EFI_LOADED_IMAGE_PROTOCOL),
+ (VOID **)&DriverEntry->LoadedImage
+ );
+ if (EFI_ERROR (Status)) {
+ if (Buffer != NULL) {
+ MmFreePool (Buffer);
+ }
+ MmFreePages (DstBuffer, PageCount);
+ return Status;
+ }
+
+ ZeroMem (DriverEntry->LoadedImage, sizeof (EFI_LOADED_IMAGE_PROTOCOL));
+ //
+ // Fill in the remaining fields of the Loaded Image Protocol instance.
+ // Note: ImageBase is an SMRAM address that can not be accessed outside of SMRAM if SMRAM window is closed.
+ //
+ DriverEntry->LoadedImage->Revision = EFI_LOADED_IMAGE_PROTOCOL_REVISION;
+ DriverEntry->LoadedImage->ParentHandle = NULL;
+ DriverEntry->LoadedImage->SystemTable = mEfiSystemTable;
+ DriverEntry->LoadedImage->DeviceHandle = NULL;
+ DriverEntry->LoadedImage->FilePath = NULL;
+
+ DriverEntry->LoadedImage->ImageBase = (VOID *)(UINTN)DriverEntry->ImageBuffer;
+ DriverEntry->LoadedImage->ImageSize = ImageContext.ImageSize;
+ DriverEntry->LoadedImage->ImageCodeType = EfiRuntimeServicesCode;
+ DriverEntry->LoadedImage->ImageDataType = EfiRuntimeServicesData;
+
+ //
+ // Create a new image handle in the UEFI handle database for the MM Driver
+ //
+ DriverEntry->ImageHandle = NULL;
+ Status = mEfiSystemTable->BootServices->InstallMultipleProtocolInterfaces (
+ &DriverEntry->ImageHandle,
+ &gEfiLoadedImageProtocolGuid,
+ DriverEntry->LoadedImage,
+ NULL
+ );
+ }
+
+ //
+ // Print the load address and the PDB file name if it is available
+ //
+ DEBUG_CODE_BEGIN ();
+
+ UINTN Index;
+ UINTN StartIndex;
+ CHAR8 EfiFileName[256];
+
+ DEBUG ((DEBUG_INFO | DEBUG_LOAD,
+ "Loading MM driver at 0x%11p EntryPoint=0x%11p ",
+ (VOID *)(UINTN) ImageContext.ImageAddress,
+ FUNCTION_ENTRY_POINT (ImageContext.EntryPoint)));
+
+ //
+ // Print Module Name by Pdb file path.
+ // Windows and Unix style file path are all trimmed correctly.
+ //
+ if (ImageContext.PdbPointer != NULL) {
+ StartIndex = 0;
+ for (Index = 0; ImageContext.PdbPointer[Index] != 0; Index++) {
+ if ((ImageContext.PdbPointer[Index] == '\\') || (ImageContext.PdbPointer[Index] == '/')) {
+ StartIndex = Index + 1;
+ }
+ }
+
+ //
+ // Copy the PDB file name to our temporary string, and replace .pdb with .efi
+ // The PDB file name is limited in the range of 0~255.
+ // If the length is bigger than 255, trim the redudant characters to avoid overflow in array boundary.
+ //
+ for (Index = 0; Index < sizeof (EfiFileName) - 4; Index++) {
+ EfiFileName[Index] = ImageContext.PdbPointer[Index + StartIndex];
+ if (EfiFileName[Index] == 0) {
+ EfiFileName[Index] = '.';
+ }
+ if (EfiFileName[Index] == '.') {
+ EfiFileName[Index + 1] = 'e';
+ EfiFileName[Index + 2] = 'f';
+ EfiFileName[Index + 3] = 'i';
+ EfiFileName[Index + 4] = 0;
+ break;
+ }
+ }
+
+ if (Index == sizeof (EfiFileName) - 4) {
+ EfiFileName[Index] = 0;
+ }
+ DEBUG ((DEBUG_INFO | DEBUG_LOAD, "%a", EfiFileName));
+ }
+ DEBUG ((DEBUG_INFO | DEBUG_LOAD, "\n"));
+
+ DEBUG_CODE_END ();
+
+ //
+ // Free buffer allocated by Fv->ReadSection.
+ //
+ // The UEFI Boot Services FreePool() function must be used because Fv->ReadSection
+ // used the UEFI Boot Services AllocatePool() function
+ //
+ MmFreePool (Buffer);
+ return Status;
+}
+
+/**
+ Preprocess dependency expression and update DriverEntry to reflect the
+ state of Before and After dependencies. If DriverEntry->Before
+ or DriverEntry->After is set it will never be cleared.
+
+ @param DriverEntry DriverEntry element to update .
+
+ @retval EFI_SUCCESS It always works.
+
+**/
+EFI_STATUS
+MmPreProcessDepex (
+ IN EFI_MM_DRIVER_ENTRY *DriverEntry
+ )
+{
+ UINT8 *Iterator;
+
+ Iterator = DriverEntry->Depex;
+ DriverEntry->Dependent = TRUE;
+
+ if (*Iterator == EFI_DEP_BEFORE) {
+ DriverEntry->Before = TRUE;
+ } else if (*Iterator == EFI_DEP_AFTER) {
+ DriverEntry->After = TRUE;
+ }
+
+ if (DriverEntry->Before || DriverEntry->After) {
+ CopyMem (&DriverEntry->BeforeAfterGuid, Iterator + 1, sizeof (EFI_GUID));
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Read Depex and pre-process the Depex for Before and After. If Section Extraction
+ protocol returns an error via ReadSection defer the reading of the Depex.
+
+ @param DriverEntry Driver to work on.
+
+ @retval EFI_SUCCESS Depex read and preprossesed
+ @retval EFI_PROTOCOL_ERROR The section extraction protocol returned an error
+ and Depex reading needs to be retried.
+ @retval Error DEPEX not found.
+
+**/
+EFI_STATUS
+MmGetDepexSectionAndPreProccess (
+ IN EFI_MM_DRIVER_ENTRY *DriverEntry
+ )
+{
+ EFI_STATUS Status;
+
+ //
+ // Data already read
+ //
+ if (DriverEntry->Depex == NULL) {
+ Status = EFI_NOT_FOUND;
+ } else {
+ Status = EFI_SUCCESS;
+ }
+ if (EFI_ERROR (Status)) {
+ if (Status == EFI_PROTOCOL_ERROR) {
+ //
+ // The section extraction protocol failed so set protocol error flag
+ //
+ DriverEntry->DepexProtocolError = TRUE;
+ } else {
+ //
+ // If no Depex assume depend on all architectural protocols
+ //
+ DriverEntry->Depex = NULL;
+ DriverEntry->Dependent = TRUE;
+ DriverEntry->DepexProtocolError = FALSE;
+ }
+ } else {
+ //
+ // Set Before and After state information based on Depex
+ // Driver will be put in Dependent state
+ //
+ MmPreProcessDepex (DriverEntry);
+ DriverEntry->DepexProtocolError = FALSE;
+ }
+
+ return Status;
+}
+
+/**
+ This is the main Dispatcher for MM and it exits when there are no more
+ drivers to run. Drain the mScheduledQueue and load and start a PE
+ image for each driver. Search the mDiscoveredList to see if any driver can
+ be placed on the mScheduledQueue. If no drivers are placed on the
+ mScheduledQueue exit the function.
+
+ @retval EFI_SUCCESS All of the MM Drivers that could be dispatched
+ have been run and the MM Entry Point has been
+ registered.
+ @retval EFI_NOT_READY The MM Driver that registered the MM Entry Point
+ was just dispatched.
+ @retval EFI_NOT_FOUND There are no MM Drivers available to be dispatched.
+ @retval EFI_ALREADY_STARTED The MM Dispatcher is already running
+
+**/
+EFI_STATUS
+MmDispatcher (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ LIST_ENTRY *Link;
+ EFI_MM_DRIVER_ENTRY *DriverEntry;
+ BOOLEAN ReadyToRun;
+ BOOLEAN PreviousMmEntryPointRegistered;
+
+ DEBUG ((DEBUG_INFO, "MmDispatcher\n"));
+
+ if (!gRequestDispatch) {
+ DEBUG ((DEBUG_INFO, " !gRequestDispatch\n"));
+ return EFI_NOT_FOUND;
+ }
+
+ if (gDispatcherRunning) {
+ DEBUG ((DEBUG_INFO, " gDispatcherRunning\n"));
+ //
+ // If the dispatcher is running don't let it be restarted.
+ //
+ return EFI_ALREADY_STARTED;
+ }
+
+ gDispatcherRunning = TRUE;
+
+ do {
+ //
+ // Drain the Scheduled Queue
+ //
+ DEBUG ((DEBUG_INFO, " Drain the Scheduled Queue\n"));
+ while (!IsListEmpty (&mScheduledQueue)) {
+ DriverEntry = CR (
+ mScheduledQueue.ForwardLink,
+ EFI_MM_DRIVER_ENTRY,
+ ScheduledLink,
+ EFI_MM_DRIVER_ENTRY_SIGNATURE
+ );
+ DEBUG ((DEBUG_INFO, " DriverEntry (Scheduled) - %g\n", &DriverEntry->FileName));
+
+ //
+ // Load the MM Driver image into memory. If the Driver was transitioned from
+ // Untrused to Scheduled it would have already been loaded so we may need to
+ // skip the LoadImage
+ //
+ if (DriverEntry->ImageHandle == NULL) {
+ Status = MmLoadImage (DriverEntry);
+
+ //
+ // Update the driver state to reflect that it's been loaded
+ //
+ if (EFI_ERROR (Status)) {
+ //
+ // The MM Driver could not be loaded, and do not attempt to load or start it again.
+ // Take driver from Scheduled to Initialized.
+ //
+ DriverEntry->Initialized = TRUE;
+ DriverEntry->Scheduled = FALSE;
+ RemoveEntryList (&DriverEntry->ScheduledLink);
+
+ //
+ // If it's an error don't try the StartImage
+ //
+ continue;
+ }
+ }
+
+ DriverEntry->Scheduled = FALSE;
+ DriverEntry->Initialized = TRUE;
+ RemoveEntryList (&DriverEntry->ScheduledLink);
+
+ //
+ // Cache state of MmEntryPointRegistered before calling entry point
+ //
+ PreviousMmEntryPointRegistered = gMmCorePrivate->MmEntryPointRegistered;
+
+ //
+ // For each MM driver, pass NULL as ImageHandle
+ //
+ if (mEfiSystemTable == NULL) {
+ DEBUG ((DEBUG_INFO, "StartImage - 0x%x (Standalone Mode)\n", DriverEntry->ImageEntryPoint));
+ Status = ((MM_IMAGE_ENTRY_POINT)(UINTN)DriverEntry->ImageEntryPoint) (DriverEntry->ImageHandle, &gMmCoreMmst);
+ } else {
+ DEBUG ((DEBUG_INFO, "StartImage - 0x%x (Tradition Mode)\n", DriverEntry->ImageEntryPoint));
+ Status = ((EFI_IMAGE_ENTRY_POINT)(UINTN)DriverEntry->ImageEntryPoint) (
+ DriverEntry->ImageHandle,
+ mEfiSystemTable
+ );
+ }
+ if (EFI_ERROR(Status)) {
+ DEBUG ((DEBUG_INFO, "StartImage Status - %r\n", Status));
+ MmFreePages(DriverEntry->ImageBuffer, DriverEntry->NumberOfPage);
+ }
+
+ if (!PreviousMmEntryPointRegistered && gMmCorePrivate->MmEntryPointRegistered) {
+ //
+ // Return immediately if the MM Entry Point was registered by the MM
+ // Driver that was just dispatched. The MM IPL will reinvoke the MM
+ // Core Dispatcher. This is required so MM Mode may be enabled as soon
+ // as all the dependent MM Drivers for MM Mode have been dispatched.
+ // Once the MM Entry Point has been registered, then MM Mode will be
+ // used.
+ //
+ gRequestDispatch = TRUE;
+ gDispatcherRunning = FALSE;
+ return EFI_NOT_READY;
+ }
+ }
+
+ //
+ // Search DriverList for items to place on Scheduled Queue
+ //
+ DEBUG ((DEBUG_INFO, " Search DriverList for items to place on Scheduled Queue\n"));
+ ReadyToRun = FALSE;
+ for (Link = mDiscoveredList.ForwardLink; Link != &mDiscoveredList; Link = Link->ForwardLink) {
+ DriverEntry = CR (Link, EFI_MM_DRIVER_ENTRY, Link, EFI_MM_DRIVER_ENTRY_SIGNATURE);
+ DEBUG ((DEBUG_INFO, " DriverEntry (Discovered) - %g\n", &DriverEntry->FileName));
+
+ if (DriverEntry->DepexProtocolError) {
+ //
+ // If Section Extraction Protocol did not let the Depex be read before retry the read
+ //
+ Status = MmGetDepexSectionAndPreProccess (DriverEntry);
+ }
+
+ if (DriverEntry->Dependent) {
+ if (MmIsSchedulable (DriverEntry)) {
+ MmInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry);
+ ReadyToRun = TRUE;
+ }
+ }
+ }
+ } while (ReadyToRun);
+
+ //
+ // If there is no more MM driver to dispatch, stop the dispatch request
+ //
+ DEBUG ((DEBUG_INFO, " no more MM driver to dispatch, stop the dispatch request\n"));
+ gRequestDispatch = FALSE;
+ for (Link = mDiscoveredList.ForwardLink; Link != &mDiscoveredList; Link = Link->ForwardLink) {
+ DriverEntry = CR (Link, EFI_MM_DRIVER_ENTRY, Link, EFI_MM_DRIVER_ENTRY_SIGNATURE);
+ DEBUG ((DEBUG_INFO, " DriverEntry (Discovered) - %g\n", &DriverEntry->FileName));
+
+ if (!DriverEntry->Initialized) {
+ //
+ // We have MM driver pending to dispatch
+ //
+ gRequestDispatch = TRUE;
+ break;
+ }
+ }
+
+ gDispatcherRunning = FALSE;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Insert InsertedDriverEntry onto the mScheduledQueue. To do this you
+ must add any driver with a before dependency on InsertedDriverEntry first.
+ You do this by recursively calling this routine. After all the Befores are
+ processed you can add InsertedDriverEntry to the mScheduledQueue.
+ Then you can add any driver with an After dependency on InsertedDriverEntry
+ by recursively calling this routine.
+
+ @param InsertedDriverEntry The driver to insert on the ScheduledLink Queue
+
+**/
+VOID
+MmInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
+ IN EFI_MM_DRIVER_ENTRY *InsertedDriverEntry
+ )
+{
+ LIST_ENTRY *Link;
+ EFI_MM_DRIVER_ENTRY *DriverEntry;
+
+ //
+ // Process Before Dependency
+ //
+ for (Link = mDiscoveredList.ForwardLink; Link != &mDiscoveredList; Link = Link->ForwardLink) {
+ DriverEntry = CR(Link, EFI_MM_DRIVER_ENTRY, Link, EFI_MM_DRIVER_ENTRY_SIGNATURE);
+ if (DriverEntry->Before && DriverEntry->Dependent && DriverEntry != InsertedDriverEntry) {
+ DEBUG ((DEBUG_DISPATCH, "Evaluate MM DEPEX for FFS(%g)\n", &DriverEntry->FileName));
+ DEBUG ((DEBUG_DISPATCH, " BEFORE FFS(%g) = ", &DriverEntry->BeforeAfterGuid));
+ if (CompareGuid (&InsertedDriverEntry->FileName, &DriverEntry->BeforeAfterGuid)) {
+ //
+ // Recursively process BEFORE
+ //
+ DEBUG ((DEBUG_DISPATCH, "TRUE\n END\n RESULT = TRUE\n"));
+ MmInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry);
+ } else {
+ DEBUG ((DEBUG_DISPATCH, "FALSE\n END\n RESULT = FALSE\n"));
+ }
+ }
+ }
+
+ //
+ // Convert driver from Dependent to Scheduled state
+ //
+
+ InsertedDriverEntry->Dependent = FALSE;
+ InsertedDriverEntry->Scheduled = TRUE;
+ InsertTailList (&mScheduledQueue, &InsertedDriverEntry->ScheduledLink);
+
+
+ //
+ // Process After Dependency
+ //
+ for (Link = mDiscoveredList.ForwardLink; Link != &mDiscoveredList; Link = Link->ForwardLink) {
+ DriverEntry = CR(Link, EFI_MM_DRIVER_ENTRY, Link, EFI_MM_DRIVER_ENTRY_SIGNATURE);
+ if (DriverEntry->After && DriverEntry->Dependent && DriverEntry != InsertedDriverEntry) {
+ DEBUG ((DEBUG_DISPATCH, "Evaluate MM DEPEX for FFS(%g)\n", &DriverEntry->FileName));
+ DEBUG ((DEBUG_DISPATCH, " AFTER FFS(%g) = ", &DriverEntry->BeforeAfterGuid));
+ if (CompareGuid (&InsertedDriverEntry->FileName, &DriverEntry->BeforeAfterGuid)) {
+ //
+ // Recursively process AFTER
+ //
+ DEBUG ((DEBUG_DISPATCH, "TRUE\n END\n RESULT = TRUE\n"));
+ MmInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry);
+ } else {
+ DEBUG ((DEBUG_DISPATCH, "FALSE\n END\n RESULT = FALSE\n"));
+ }
+ }
+ }
+}
+
+/**
+ Return TRUE if the Fv has been processed, FALSE if not.
+
+ @param FvHandle The handle of a FV that's being tested
+
+ @retval TRUE Fv protocol on FvHandle has been processed
+ @retval FALSE Fv protocol on FvHandle has not yet been
+ processed
+
+**/
+BOOLEAN
+FvHasBeenProcessed (
+ IN EFI_HANDLE FvHandle
+ )
+{
+ LIST_ENTRY *Link;
+ KNOWN_HANDLE *KnownHandle;
+
+ for (Link = mFvHandleList.ForwardLink; Link != &mFvHandleList; Link = Link->ForwardLink) {
+ KnownHandle = CR (Link, KNOWN_HANDLE, Link, KNOWN_HANDLE_SIGNATURE);
+ if (KnownHandle->Handle == FvHandle) {
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
+/**
+ Remember that Fv protocol on FvHandle has had it's drivers placed on the
+ mDiscoveredList. This fucntion adds entries on the mFvHandleList. Items are
+ never removed/freed from the mFvHandleList.
+
+ @param FvHandle The handle of a FV that has been processed
+
+**/
+VOID
+FvIsBeingProcesssed (
+ IN EFI_HANDLE FvHandle
+ )
+{
+ KNOWN_HANDLE *KnownHandle;
+
+ DEBUG ((DEBUG_INFO, "FvIsBeingProcesssed - 0x%08x\n", FvHandle));
+
+ KnownHandle = AllocatePool (sizeof (KNOWN_HANDLE));
+ ASSERT (KnownHandle != NULL);
+
+ KnownHandle->Signature = KNOWN_HANDLE_SIGNATURE;
+ KnownHandle->Handle = FvHandle;
+ InsertTailList (&mFvHandleList, &KnownHandle->Link);
+}
+
+/**
+ Add an entry to the mDiscoveredList. Allocate memory to store the DriverEntry,
+ and initilize any state variables. Read the Depex from the FV and store it
+ in DriverEntry. Pre-process the Depex to set the Before and After state.
+ The Discovered list is never free'ed and contains booleans that represent the
+ other possible MM driver states.
+
+ @param Fv Fv protocol, needed to read Depex info out of
+ FLASH.
+ @param FvHandle Handle for Fv, needed in the
+ EFI_MM_DRIVER_ENTRY so that the PE image can be
+ read out of the FV at a later time.
+ @param DriverName Name of driver to add to mDiscoveredList.
+
+ @retval EFI_SUCCESS If driver was added to the mDiscoveredList.
+ @retval EFI_ALREADY_STARTED The driver has already been started. Only one
+ DriverName may be active in the system at any one
+ time.
+
+**/
+EFI_STATUS
+MmAddToDriverList (
+ IN EFI_HANDLE FvHandle,
+ IN VOID *Pe32Data,
+ IN UINTN Pe32DataSize,
+ IN VOID *Depex,
+ IN UINTN DepexSize,
+ IN EFI_GUID *DriverName
+ )
+{
+ EFI_MM_DRIVER_ENTRY *DriverEntry;
+
+ DEBUG ((DEBUG_INFO, "MmAddToDriverList - %g (0x%08x)\n", DriverName, Pe32Data));
+
+ //
+ // Create the Driver Entry for the list. ZeroPool initializes lots of variables to
+ // NULL or FALSE.
+ //
+ DriverEntry = AllocateZeroPool (sizeof (EFI_MM_DRIVER_ENTRY));
+ ASSERT (DriverEntry != NULL);
+
+ DriverEntry->Signature = EFI_MM_DRIVER_ENTRY_SIGNATURE;
+ CopyGuid (&DriverEntry->FileName, DriverName);
+ DriverEntry->FvHandle = FvHandle;
+ DriverEntry->Pe32Data = Pe32Data;
+ DriverEntry->Pe32DataSize = Pe32DataSize;
+ DriverEntry->Depex = Depex;
+ DriverEntry->DepexSize = DepexSize;
+
+ MmGetDepexSectionAndPreProccess (DriverEntry);
+
+ InsertTailList (&mDiscoveredList, &DriverEntry->Link);
+ gRequestDispatch = TRUE;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ This function is the main entry point for an MM handler dispatch
+ or communicate-based callback.
+
+ Event notification that is fired every time a FV dispatch protocol is added.
+ More than one protocol may have been added when this event is fired, so you
+ must loop on MmLocateHandle () to see how many protocols were added and
+ do the following to each FV:
+ If the Fv has already been processed, skip it. If the Fv has not been
+ processed then mark it as being processed, as we are about to process it.
+ Read the Fv and add any driver in the Fv to the mDiscoveredList.The
+ mDiscoveredList is never free'ed and contains variables that define
+ the other states the MM driver transitions to..
+ While you are at it read the A Priori file into memory.
+ Place drivers in the A Priori list onto the mScheduledQueue.
+
+ @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
+ @param Context Points to an optional handler context which was specified when the handler was registered.
+ @param CommBuffer A pointer to a collection of data in memory that will
+ be conveyed from a non-MM environment into an MM environment.
+ @param CommBufferSize The size of the CommBuffer.
+
+ @return Status Code
+
+**/
+EFI_STATUS
+EFIAPI
+MmDriverDispatchHandler (
+ IN EFI_HANDLE DispatchHandle,
+ IN CONST VOID *Context, OPTIONAL
+ IN OUT VOID *CommBuffer, OPTIONAL
+ IN OUT UINTN *CommBufferSize OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+
+ DEBUG ((DEBUG_INFO, "MmDriverDispatchHandler\n"));
+
+ //
+ // Execute the MM Dispatcher on any newly discovered FVs and previously
+ // discovered MM drivers that have been discovered but not dispatched.
+ //
+ Status = MmDispatcher ();
+
+ //
+ // Check to see if CommBuffer and CommBufferSize are valid
+ //
+ if (CommBuffer != NULL && CommBufferSize != NULL) {
+ if (*CommBufferSize > 0) {
+ if (Status == EFI_NOT_READY) {
+ //
+ // If a the MM Core Entry Point was just registered, then set flag to
+ // request the MM Dispatcher to be restarted.
+ //
+ *(UINT8 *)CommBuffer = COMM_BUFFER_MM_DISPATCH_RESTART;
+ } else if (!EFI_ERROR (Status)) {
+ //
+ // Set the flag to show that the MM Dispatcher executed without errors
+ //
+ *(UINT8 *)CommBuffer = COMM_BUFFER_MM_DISPATCH_SUCCESS;
+ } else {
+ //
+ // Set the flag to show that the MM Dispatcher encountered an error
+ //
+ *(UINT8 *)CommBuffer = COMM_BUFFER_MM_DISPATCH_ERROR;
+ }
+ }
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ This function is the main entry point for an MM handler dispatch
+ or communicate-based callback.
+
+ @param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
+ @param Context Points to an optional handler context which was specified when the handler was registered.
+ @param CommBuffer A pointer to a collection of data in memory that will
+ be conveyed from a non-MM environment into an MM environment.
+ @param CommBufferSize The size of the CommBuffer.
+
+ @return Status Code
+
+**/
+EFI_STATUS
+EFIAPI
+MmFvDispatchHandler (
+ IN EFI_HANDLE DispatchHandle,
+ IN CONST VOID *Context, OPTIONAL
+ IN OUT VOID *CommBuffer, OPTIONAL
+ IN OUT UINTN *CommBufferSize OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ EFI_MM_COMMUNICATE_FV_DISPATCH_DATA *CommunicationFvDispatchData;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+
+ DEBUG ((DEBUG_INFO, "MmFvDispatchHandler\n"));
+
+ CommunicationFvDispatchData = CommBuffer;
+
+ DEBUG ((DEBUG_INFO, " Dispatch - 0x%016lx - 0x%016lx\n", CommunicationFvDispatchData->Address,
+ CommunicationFvDispatchData->Size));
+
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)CommunicationFvDispatchData->Address;
+
+ MmCoreFfsFindMmDriver (FwVolHeader);
+
+ //
+ // Execute the MM Dispatcher on any newly discovered FVs and previously
+ // discovered MM drivers that have been discovered but not dispatched.
+ //
+ Status = MmDispatcher ();
+
+ return Status;
+}
+
+/**
+ Traverse the discovered list for any drivers that were discovered but not loaded
+ because the dependency experessions evaluated to false.
+
+**/
+VOID
+MmDisplayDiscoveredNotDispatched (
+ VOID
+ )
+{
+ LIST_ENTRY *Link;
+ EFI_MM_DRIVER_ENTRY *DriverEntry;
+
+ for (Link = mDiscoveredList.ForwardLink;Link !=&mDiscoveredList; Link = Link->ForwardLink) {
+ DriverEntry = CR (Link, EFI_MM_DRIVER_ENTRY, Link, EFI_MM_DRIVER_ENTRY_SIGNATURE);
+ if (DriverEntry->Dependent) {
+ DEBUG ((DEBUG_LOAD, "MM Driver %g was discovered but not loaded!!\n", &DriverEntry->FileName));
+ }
+ }
+}
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