| /** @file | |
| SMM IPL that produces SMM related runtime protocols and load the SMM Core into SMRAM | |
| Copyright (c) 2009 - 2013, Intel Corporation. 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 <PiDxe.h> | |
| #include <Protocol/SmmBase2.h> | |
| #include <Protocol/SmmCommunication.h> | |
| #include <Protocol/SmmAccess2.h> | |
| #include <Protocol/SmmConfiguration.h> | |
| #include <Protocol/SmmControl2.h> | |
| #include <Protocol/DxeSmmReadyToLock.h> | |
| #include <Protocol/Cpu.h> | |
| #include <Guid/EventGroup.h> | |
| #include <Guid/EventLegacyBios.h> | |
| #include <Guid/LoadModuleAtFixedAddress.h> | |
| #include <Library/BaseLib.h> | |
| #include <Library/BaseMemoryLib.h> | |
| #include <Library/PeCoffLib.h> | |
| #include <Library/CacheMaintenanceLib.h> | |
| #include <Library/MemoryAllocationLib.h> | |
| #include <Library/DebugLib.h> | |
| #include <Library/UefiBootServicesTableLib.h> | |
| #include <Library/DxeServicesTableLib.h> | |
| #include <Library/DxeServicesLib.h> | |
| #include <Library/UefiLib.h> | |
| #include <Library/UefiRuntimeLib.h> | |
| #include <Library/PcdLib.h> | |
| #include "PiSmmCorePrivateData.h" | |
| // | |
| // Function prototypes from produced protocols | |
| // | |
| /** | |
| Indicate whether the driver is currently executing in the SMM Initialization phase. | |
| @param This The EFI_SMM_BASE2_PROTOCOL instance. | |
| @param InSmram Pointer to a Boolean which, on return, indicates that the driver is currently executing | |
| inside of SMRAM (TRUE) or outside of SMRAM (FALSE). | |
| @retval EFI_INVALID_PARAMETER InSmram was NULL. | |
| @retval EFI_SUCCESS The call returned successfully. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmBase2InSmram ( | |
| IN CONST EFI_SMM_BASE2_PROTOCOL *This, | |
| OUT BOOLEAN *InSmram | |
| ); | |
| /** | |
| Retrieves the location of the System Management System Table (SMST). | |
| @param This The EFI_SMM_BASE2_PROTOCOL instance. | |
| @param Smst On return, points to a pointer to the System Management Service Table (SMST). | |
| @retval EFI_INVALID_PARAMETER Smst or This was invalid. | |
| @retval EFI_SUCCESS The memory was returned to the system. | |
| @retval EFI_UNSUPPORTED Not in SMM. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmBase2GetSmstLocation ( | |
| IN CONST EFI_SMM_BASE2_PROTOCOL *This, | |
| OUT EFI_SMM_SYSTEM_TABLE2 **Smst | |
| ); | |
| /** | |
| Communicates with a registered handler. | |
| This function provides a service to send and receive messages from a registered | |
| UEFI service. This function is part of the SMM Communication Protocol that may | |
| be called in physical mode prior to SetVirtualAddressMap() and in virtual mode | |
| after SetVirtualAddressMap(). | |
| @param[in] This The EFI_SMM_COMMUNICATION_PROTOCOL instance. | |
| @param[in, out] CommBuffer A pointer to the buffer to convey into SMRAM. | |
| @param[in, out] CommSize The size of the data buffer being passed in.On exit, the size of data | |
| being returned. Zero if the handler does not wish to reply with any data. | |
| @retval EFI_SUCCESS The message was successfully posted. | |
| @retval EFI_INVALID_PARAMETER The CommBuffer was NULL. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmCommunicationCommunicate ( | |
| IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This, | |
| IN OUT VOID *CommBuffer, | |
| IN OUT UINTN *CommSize | |
| ); | |
| /** | |
| Event notification that is fired every time a gEfiSmmConfigurationProtocol installs. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplSmmConfigurationEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ); | |
| /** | |
| Event notification that is fired every time a DxeSmmReadyToLock protocol is added | |
| or if gEfiEventReadyToBootGuid is signalled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplReadyToLockEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ); | |
| /** | |
| Event notification that is fired when DxeDispatch Event Group is signaled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplDxeDispatchEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ); | |
| /** | |
| Event notification that is fired when a GUIDed Event Group is signaled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplGuidedEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ); | |
| /** | |
| Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE. | |
| This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event. | |
| It convers pointer to new virtual address. | |
| @param Event Event whose notification function is being invoked. | |
| @param Context Pointer to the notification function's context. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplSetVirtualAddressNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ); | |
| // | |
| // Data structure used to declare a table of protocol notifications and event | |
| // notifications required by the SMM IPL | |
| // | |
| typedef struct { | |
| BOOLEAN Protocol; | |
| BOOLEAN CloseOnLock; | |
| EFI_GUID *Guid; | |
| EFI_EVENT_NOTIFY NotifyFunction; | |
| VOID *NotifyContext; | |
| EFI_TPL NotifyTpl; | |
| EFI_EVENT Event; | |
| } SMM_IPL_EVENT_NOTIFICATION; | |
| // | |
| // Handle to install the SMM Base2 Protocol and the SMM Communication Protocol | |
| // | |
| EFI_HANDLE mSmmIplHandle = NULL; | |
| // | |
| // SMM Base 2 Protocol instance | |
| // | |
| EFI_SMM_BASE2_PROTOCOL mSmmBase2 = { | |
| SmmBase2InSmram, | |
| SmmBase2GetSmstLocation | |
| }; | |
| // | |
| // SMM Communication Protocol instance | |
| // | |
| EFI_SMM_COMMUNICATION_PROTOCOL mSmmCommunication = { | |
| SmmCommunicationCommunicate | |
| }; | |
| // | |
| // SMM Core Private Data structure that contains the data shared between | |
| // the SMM IPL and the SMM Core. | |
| // | |
| SMM_CORE_PRIVATE_DATA mSmmCorePrivateData = { | |
| SMM_CORE_PRIVATE_DATA_SIGNATURE, // Signature | |
| NULL, // SmmIplImageHandle | |
| 0, // SmramRangeCount | |
| NULL, // SmramRanges | |
| NULL, // SmmEntryPoint | |
| FALSE, // SmmEntryPointRegistered | |
| FALSE, // InSmm | |
| NULL, // Smst | |
| NULL, // CommunicationBuffer | |
| 0, // BufferSize | |
| EFI_SUCCESS // ReturnStatus | |
| }; | |
| // | |
| // Global pointer used to access mSmmCorePrivateData from outside and inside SMM | |
| // | |
| SMM_CORE_PRIVATE_DATA *gSmmCorePrivate = &mSmmCorePrivateData; | |
| // | |
| // SMM IPL global variables | |
| // | |
| EFI_SMM_CONTROL2_PROTOCOL *mSmmControl2; | |
| EFI_SMM_ACCESS2_PROTOCOL *mSmmAccess; | |
| EFI_SMRAM_DESCRIPTOR *mCurrentSmramRange; | |
| BOOLEAN mSmmLocked = FALSE; | |
| EFI_PHYSICAL_ADDRESS mSmramCacheBase; | |
| UINT64 mSmramCacheSize; | |
| // | |
| // Table of Protocol notification and GUIDed Event notifications that the SMM IPL requires | |
| // | |
| SMM_IPL_EVENT_NOTIFICATION mSmmIplEvents[] = { | |
| // | |
| // Declare protocol notification on the SMM Configuration protocol. When this notification is etablished, | |
| // the associated event is immediately signalled, so the notification function will be executed and the | |
| // SMM Configuration Protocol will be found if it is already in the handle database. | |
| // | |
| { TRUE, FALSE, &gEfiSmmConfigurationProtocolGuid, SmmIplSmmConfigurationEventNotify, &gEfiSmmConfigurationProtocolGuid, TPL_NOTIFY, NULL }, | |
| // | |
| // Declare protocl notification on DxeSmmReadyToLock protocols. When this notification is etablished, | |
| // the associated event is immediately signalled, so the notification function will be executed and the | |
| // DXE SMM Ready To Lock Protocol will be found if it is already in the handle database. | |
| // | |
| { TRUE, TRUE, &gEfiDxeSmmReadyToLockProtocolGuid, SmmIplReadyToLockEventNotify, &gEfiDxeSmmReadyToLockProtocolGuid, TPL_CALLBACK, NULL }, | |
| // | |
| // Declare event notification on EndOfDxe event. When this notification is etablished, | |
| // the associated event is immediately signalled, so the notification function will be executed and the | |
| // SMM End Of Dxe Protocol will be found if it is already in the handle database. | |
| // | |
| { FALSE, FALSE, &gEfiEndOfDxeEventGroupGuid, SmmIplGuidedEventNotify, &gEfiEndOfDxeEventGroupGuid, TPL_CALLBACK, NULL }, | |
| // | |
| // Declare event notification on the DXE Dispatch Event Group. This event is signaled by the DXE Core | |
| // each time the DXE Core dispatcher has completed its work. When this event is signalled, the SMM Core | |
| // if notified, so the SMM Core can dispatch SMM drivers. | |
| // | |
| { FALSE, TRUE, &gEfiEventDxeDispatchGuid, SmmIplDxeDispatchEventNotify, &gEfiEventDxeDispatchGuid, TPL_CALLBACK, NULL }, | |
| // | |
| // Declare event notification on Ready To Boot Event Group. This is an extra event notification that is | |
| // used to make sure SMRAM is locked before any boot options are processed. | |
| // | |
| { FALSE, TRUE, &gEfiEventReadyToBootGuid, SmmIplReadyToLockEventNotify, &gEfiEventReadyToBootGuid, TPL_CALLBACK, NULL }, | |
| // | |
| // Declare event notification on Legacy Boot Event Group. This is used to inform the SMM Core that the platform | |
| // is performing a legacy boot operation, and that the UEFI environment is no longer available and the SMM Core | |
| // must guarantee that it does not access any UEFI related structures outside of SMRAM. | |
| // | |
| { FALSE, FALSE, &gEfiEventLegacyBootGuid, SmmIplGuidedEventNotify, &gEfiEventLegacyBootGuid, TPL_CALLBACK, NULL }, | |
| // | |
| // Declare event notification on SetVirtualAddressMap() Event Group. This is used to convert gSmmCorePrivate | |
| // and mSmmControl2 from physical addresses to virtual addresses. | |
| // | |
| { FALSE, FALSE, &gEfiEventVirtualAddressChangeGuid, SmmIplSetVirtualAddressNotify, NULL, TPL_CALLBACK, NULL }, | |
| // | |
| // Terminate the table of event notifications | |
| // | |
| { FALSE, FALSE, NULL, NULL, NULL, TPL_CALLBACK, NULL } | |
| }; | |
| /** | |
| Find the maximum SMRAM cache range that covers the range specified by SmramRange. | |
| This function searches and joins all adjacent ranges of SmramRange into a range to be cached. | |
| @param SmramRange The SMRAM range to search from. | |
| @param SmramCacheBase The returned cache range base. | |
| @param SmramCacheSize The returned cache range size. | |
| **/ | |
| VOID | |
| GetSmramCacheRange ( | |
| IN EFI_SMRAM_DESCRIPTOR *SmramRange, | |
| OUT EFI_PHYSICAL_ADDRESS *SmramCacheBase, | |
| OUT UINT64 *SmramCacheSize | |
| ) | |
| { | |
| UINTN Index; | |
| EFI_PHYSICAL_ADDRESS RangeCpuStart; | |
| UINT64 RangePhysicalSize; | |
| BOOLEAN FoundAjacentRange; | |
| *SmramCacheBase = SmramRange->CpuStart; | |
| *SmramCacheSize = SmramRange->PhysicalSize; | |
| do { | |
| FoundAjacentRange = FALSE; | |
| for (Index = 0; Index < gSmmCorePrivate->SmramRangeCount; Index++) { | |
| RangeCpuStart = gSmmCorePrivate->SmramRanges[Index].CpuStart; | |
| RangePhysicalSize = gSmmCorePrivate->SmramRanges[Index].PhysicalSize; | |
| if (RangeCpuStart < *SmramCacheBase && *SmramCacheBase == (RangeCpuStart + RangePhysicalSize)) { | |
| *SmramCacheBase = RangeCpuStart; | |
| *SmramCacheSize += RangePhysicalSize; | |
| FoundAjacentRange = TRUE; | |
| } else if ((*SmramCacheBase + *SmramCacheSize) == RangeCpuStart && RangePhysicalSize > 0) { | |
| *SmramCacheSize += RangePhysicalSize; | |
| FoundAjacentRange = TRUE; | |
| } | |
| } | |
| } while (FoundAjacentRange); | |
| } | |
| /** | |
| Indicate whether the driver is currently executing in the SMM Initialization phase. | |
| @param This The EFI_SMM_BASE2_PROTOCOL instance. | |
| @param InSmram Pointer to a Boolean which, on return, indicates that the driver is currently executing | |
| inside of SMRAM (TRUE) or outside of SMRAM (FALSE). | |
| @retval EFI_INVALID_PARAMETER InSmram was NULL. | |
| @retval EFI_SUCCESS The call returned successfully. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmBase2InSmram ( | |
| IN CONST EFI_SMM_BASE2_PROTOCOL *This, | |
| OUT BOOLEAN *InSmram | |
| ) | |
| { | |
| if (InSmram == NULL) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| *InSmram = gSmmCorePrivate->InSmm; | |
| return EFI_SUCCESS; | |
| } | |
| /** | |
| Retrieves the location of the System Management System Table (SMST). | |
| @param This The EFI_SMM_BASE2_PROTOCOL instance. | |
| @param Smst On return, points to a pointer to the System Management Service Table (SMST). | |
| @retval EFI_INVALID_PARAMETER Smst or This was invalid. | |
| @retval EFI_SUCCESS The memory was returned to the system. | |
| @retval EFI_UNSUPPORTED Not in SMM. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmBase2GetSmstLocation ( | |
| IN CONST EFI_SMM_BASE2_PROTOCOL *This, | |
| OUT EFI_SMM_SYSTEM_TABLE2 **Smst | |
| ) | |
| { | |
| if ((This == NULL) ||(Smst == NULL)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| if (!gSmmCorePrivate->InSmm) { | |
| return EFI_UNSUPPORTED; | |
| } | |
| *Smst = gSmmCorePrivate->Smst; | |
| return EFI_SUCCESS; | |
| } | |
| /** | |
| Communicates with a registered handler. | |
| This function provides a service to send and receive messages from a registered | |
| UEFI service. This function is part of the SMM Communication Protocol that may | |
| be called in physical mode prior to SetVirtualAddressMap() and in virtual mode | |
| after SetVirtualAddressMap(). | |
| @param[in] This The EFI_SMM_COMMUNICATION_PROTOCOL instance. | |
| @param[in, out] CommBuffer A pointer to the buffer to convey into SMRAM. | |
| @param[in, out] CommSize The size of the data buffer being passed in.On exit, the size of data | |
| being returned. Zero if the handler does not wish to reply with any data. | |
| @retval EFI_SUCCESS The message was successfully posted. | |
| @retval EFI_INVALID_PARAMETER The CommBuffer was NULL. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmCommunicationCommunicate ( | |
| IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This, | |
| IN OUT VOID *CommBuffer, | |
| IN OUT UINTN *CommSize | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SMM_COMMUNICATE_HEADER *CommunicateHeader; | |
| BOOLEAN OldInSmm; | |
| // | |
| // Check parameters | |
| // | |
| if ((CommBuffer == NULL) || (CommSize == NULL)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // CommSize must hold HeaderGuid and MessageLength | |
| // | |
| if (*CommSize < OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // If not already in SMM, then generate a Software SMI | |
| // | |
| if (!gSmmCorePrivate->InSmm && gSmmCorePrivate->SmmEntryPointRegistered) { | |
| // | |
| // Put arguments for Software SMI in gSmmCorePrivate | |
| // | |
| gSmmCorePrivate->CommunicationBuffer = CommBuffer; | |
| gSmmCorePrivate->BufferSize = *CommSize; | |
| // | |
| // Generate Software SMI | |
| // | |
| Status = mSmmControl2->Trigger (mSmmControl2, NULL, NULL, FALSE, 0); | |
| if (EFI_ERROR (Status)) { | |
| return EFI_UNSUPPORTED; | |
| } | |
| // | |
| // Return status from software SMI | |
| // | |
| *CommSize = gSmmCorePrivate->BufferSize; | |
| return gSmmCorePrivate->ReturnStatus; | |
| } | |
| // | |
| // If we are in SMM, then the execution mode must be physical, which means that | |
| // OS established virtual addresses can not be used. If SetVirtualAddressMap() | |
| // has been called, then a direct invocation of the Software SMI is not | |
| // not allowed so return EFI_INVALID_PARAMETER. | |
| // | |
| if (EfiGoneVirtual()) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // If we are not in SMM, don't allow call SmiManage() directly when SMRAM is closed or locked. | |
| // | |
| if ((!gSmmCorePrivate->InSmm) && (!mSmmAccess->OpenState || mSmmAccess->LockState)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // Save current InSmm state and set InSmm state to TRUE | |
| // | |
| OldInSmm = gSmmCorePrivate->InSmm; | |
| gSmmCorePrivate->InSmm = TRUE; | |
| // | |
| // Already in SMM and before SetVirtualAddressMap(), so call SmiManage() directly. | |
| // | |
| CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)CommBuffer; | |
| *CommSize -= OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data); | |
| Status = gSmmCorePrivate->Smst->SmiManage ( | |
| &CommunicateHeader->HeaderGuid, | |
| NULL, | |
| CommunicateHeader->Data, | |
| CommSize | |
| ); | |
| // | |
| // Update CommunicationBuffer, BufferSize and ReturnStatus | |
| // Communicate service finished, reset the pointer to CommBuffer to NULL | |
| // | |
| *CommSize += OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data); | |
| // | |
| // Restore original InSmm state | |
| // | |
| gSmmCorePrivate->InSmm = OldInSmm; | |
| return (Status == EFI_SUCCESS) ? EFI_SUCCESS : EFI_NOT_FOUND; | |
| } | |
| /** | |
| Event notification that is fired when GUIDed Event Group is signaled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplGuidedEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_SMM_COMMUNICATE_HEADER CommunicateHeader; | |
| UINTN Size; | |
| // | |
| // Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure | |
| // | |
| CopyGuid (&CommunicateHeader.HeaderGuid, (EFI_GUID *)Context); | |
| CommunicateHeader.MessageLength = 1; | |
| CommunicateHeader.Data[0] = 0; | |
| // | |
| // Generate the Software SMI and return the result | |
| // | |
| Size = sizeof (CommunicateHeader); | |
| SmmCommunicationCommunicate (&mSmmCommunication, &CommunicateHeader, &Size); | |
| } | |
| /** | |
| Event notification that is fired when DxeDispatch Event Group is signaled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplDxeDispatchEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_SMM_COMMUNICATE_HEADER CommunicateHeader; | |
| UINTN Size; | |
| EFI_STATUS Status; | |
| // | |
| // Keep calling the SMM Core Dispatcher until there is no request to restart it. | |
| // | |
| while (TRUE) { | |
| // | |
| // Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure | |
| // Clear the buffer passed into the Software SMI. This buffer will return | |
| // the status of the SMM Core Dispatcher. | |
| // | |
| CopyGuid (&CommunicateHeader.HeaderGuid, (EFI_GUID *)Context); | |
| CommunicateHeader.MessageLength = 1; | |
| CommunicateHeader.Data[0] = 0; | |
| // | |
| // Generate the Software SMI and return the result | |
| // | |
| Size = sizeof (CommunicateHeader); | |
| SmmCommunicationCommunicate (&mSmmCommunication, &CommunicateHeader, &Size); | |
| // | |
| // Return if there is no request to restart the SMM Core Dispatcher | |
| // | |
| if (CommunicateHeader.Data[0] != COMM_BUFFER_SMM_DISPATCH_RESTART) { | |
| return; | |
| } | |
| // | |
| // Attempt to reset SMRAM cacheability to UC | |
| // Assume CPU AP is available at this time | |
| // | |
| Status = gDS->SetMemorySpaceAttributes( | |
| mSmramCacheBase, | |
| mSmramCacheSize, | |
| EFI_MEMORY_UC | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((DEBUG_WARN, "SMM IPL failed to reset SMRAM window to EFI_MEMORY_UC\n")); | |
| } | |
| // | |
| // Close all SMRAM ranges to protect SMRAM | |
| // | |
| Status = mSmmAccess->Close (mSmmAccess); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Print debug message that the SMRAM window is now closed. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL closed SMRAM window\n")); | |
| } | |
| } | |
| /** | |
| Event notification that is fired every time a gEfiSmmConfigurationProtocol installs. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplSmmConfigurationEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration; | |
| // | |
| // Make sure this notification is for this handler | |
| // | |
| Status = gBS->LocateProtocol (Context, NULL, (VOID **)&SmmConfiguration); | |
| if (EFI_ERROR (Status)) { | |
| return; | |
| } | |
| // | |
| // Register the SMM Entry Point provided by the SMM Core with the SMM COnfiguration protocol | |
| // | |
| Status = SmmConfiguration->RegisterSmmEntry (SmmConfiguration, gSmmCorePrivate->SmmEntryPoint); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Set flag to indicate that the SMM Entry Point has been registered which | |
| // means that SMIs are now fully operational. | |
| // | |
| gSmmCorePrivate->SmmEntryPointRegistered = TRUE; | |
| // | |
| // Print debug message showing SMM Core entry point address. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL registered SMM Entry Point address %p\n", (VOID *)(UINTN)gSmmCorePrivate->SmmEntryPoint)); | |
| } | |
| /** | |
| Event notification that is fired every time a DxeSmmReadyToLock protocol is added | |
| or if gEfiEventReadyToBootGuid is signalled. | |
| @param Event The Event that is being processed, not used. | |
| @param Context Event Context, not used. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplReadyToLockEventNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| VOID *Interface; | |
| UINTN Index; | |
| // | |
| // See if we are already locked | |
| // | |
| if (mSmmLocked) { | |
| return; | |
| } | |
| // | |
| // Make sure this notification is for this handler | |
| // | |
| if (CompareGuid ((EFI_GUID *)Context, &gEfiDxeSmmReadyToLockProtocolGuid)) { | |
| Status = gBS->LocateProtocol (&gEfiDxeSmmReadyToLockProtocolGuid, NULL, &Interface); | |
| if (EFI_ERROR (Status)) { | |
| return; | |
| } | |
| } else { | |
| // | |
| // If SMM is not locked yet and we got here from gEfiEventReadyToBootGuid being | |
| // signalled, then gEfiDxeSmmReadyToLockProtocolGuid was not installed as expected. | |
| // Print a warning on debug builds. | |
| // | |
| DEBUG ((DEBUG_WARN, "SMM IPL! DXE SMM Ready To Lock Protocol not installed before Ready To Boot signal\n")); | |
| } | |
| // | |
| // Lock the SMRAM (Note: Locking SMRAM may not be supported on all platforms) | |
| // | |
| mSmmAccess->Lock (mSmmAccess); | |
| // | |
| // Close protocol and event notification events that do not apply after the | |
| // DXE SMM Ready To Lock Protocol has been installed or the Ready To Boot | |
| // event has been signalled. | |
| // | |
| for (Index = 0; mSmmIplEvents[Index].NotifyFunction != NULL; Index++) { | |
| if (mSmmIplEvents[Index].CloseOnLock) { | |
| gBS->CloseEvent (mSmmIplEvents[Index].Event); | |
| } | |
| } | |
| // | |
| // Inform SMM Core that the DxeSmmReadyToLock protocol was installed | |
| // | |
| SmmIplGuidedEventNotify (Event, (VOID *)&gEfiDxeSmmReadyToLockProtocolGuid); | |
| // | |
| // Print debug message that the SMRAM window is now locked. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL locked SMRAM window\n")); | |
| // | |
| // Set flag so this operation will not be performed again | |
| // | |
| mSmmLocked = TRUE; | |
| } | |
| /** | |
| Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE. | |
| This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event. | |
| It convers pointer to new virtual address. | |
| @param Event Event whose notification function is being invoked. | |
| @param Context Pointer to the notification function's context. | |
| **/ | |
| VOID | |
| EFIAPI | |
| SmmIplSetVirtualAddressNotify ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EfiConvertPointer (0x0, (VOID **)&mSmmControl2); | |
| } | |
| /** | |
| Get the fixed loadding 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 FixLoaddingAddress; | |
| UINT16 Index; | |
| UINTN Size; | |
| UINT16 NumberOfSections; | |
| EFI_PHYSICAL_ADDRESS SmramBase; | |
| UINT64 SmmCodeSize; | |
| UINT64 ValueInSectionHeader; | |
| // | |
| // Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber | |
| // | |
| SmmCodeSize = EFI_PAGES_TO_SIZE (PcdGet32(PcdLoadFixAddressSmmCodePageNumber)); | |
| FixLoaddingAddress = 0; | |
| Status = EFI_NOT_FOUND; | |
| SmramBase = mCurrentSmramRange->CpuStart; | |
| // | |
| // Get PeHeader pointer | |
| // | |
| ImgHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)((CHAR8* )ImageContext->Handle + ImageContext->PeCoffHeaderOffset); | |
| SectionHeaderOffset = (UINTN)( | |
| 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 saves the offset to SMRAM base as image base in PointerToRelocations & PointerToLineNumbers fields in the | |
| // first section header that doesn't point to code section in image header. And there is an assumption that when the | |
| // feature is enabled, if a module is assigned a loading address by tools, PointerToRelocations & PointerToLineNumbers | |
| // fields should NOT be Zero, or else, these 2 fileds 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 uild tool saves the | |
| // offset to SMRAM base as image base in PointerToRelocations & PointerToLineNumbers fields | |
| // | |
| FixLoaddingAddress = (EFI_PHYSICAL_ADDRESS)(SmramBase + (INT64)ValueInSectionHeader); | |
| if (SmramBase + SmmCodeSize > FixLoaddingAddress && SmramBase <= FixLoaddingAddress) { | |
| // | |
| // The assigned address is valid. Return the specified loadding address | |
| // | |
| ImageContext->ImageAddress = FixLoaddingAddress; | |
| Status = EFI_SUCCESS; | |
| } | |
| } | |
| break; | |
| } | |
| SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER); | |
| } | |
| DEBUG ((EFI_D_INFO|EFI_D_LOAD, "LOADING MODULE FIXED INFO: Loading module at fixed address %x, Status = %r \n", FixLoaddingAddress, Status)); | |
| return Status; | |
| } | |
| /** | |
| Load the SMM Core image into SMRAM and executes the SMM Core from SMRAM. | |
| @param[in] SmramRange Descriptor for the range of SMRAM to reload the | |
| currently executing image. | |
| @param[in] Context Context to pass into SMM Core | |
| @return EFI_STATUS | |
| **/ | |
| EFI_STATUS | |
| ExecuteSmmCoreFromSmram ( | |
| IN EFI_SMRAM_DESCRIPTOR *SmramRange, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| VOID *SourceBuffer; | |
| UINTN SourceSize; | |
| PE_COFF_LOADER_IMAGE_CONTEXT ImageContext; | |
| UINTN PageCount; | |
| EFI_PHYSICAL_ADDRESS DestinationBuffer; | |
| EFI_IMAGE_ENTRY_POINT EntryPoint; | |
| // | |
| // Search all Firmware Volumes for a PE/COFF image in a file of type SMM_CORE | |
| // | |
| Status = GetSectionFromAnyFvByFileType ( | |
| EFI_FV_FILETYPE_SMM_CORE, | |
| 0, | |
| EFI_SECTION_PE32, | |
| 0, | |
| &SourceBuffer, | |
| &SourceSize | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| return Status; | |
| } | |
| // | |
| // Initilize ImageContext | |
| // | |
| ImageContext.Handle = SourceBuffer; | |
| ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory; | |
| // | |
| // Get information about the image being loaded | |
| // | |
| Status = PeCoffLoaderGetImageInfo (&ImageContext); | |
| if (EFI_ERROR (Status)) { | |
| return Status; | |
| } | |
| // | |
| // if Loading module at Fixed Address feature is enabled, the SMM core driver will be loaded to | |
| // the address assigned by build tool. | |
| // | |
| if (PcdGet64(PcdLoadModuleAtFixAddressEnable) != 0) { | |
| // | |
| // Get the fixed loading address assigned by Build tool | |
| // | |
| Status = GetPeCoffImageFixLoadingAssignedAddress (&ImageContext); | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // Since the memory range to load SMM CORE will be cut out in SMM core, so no need to allocate and free this range | |
| // | |
| PageCount = 0; | |
| } else { | |
| DEBUG ((EFI_D_INFO, "LOADING MODULE FIXED ERROR: Loading module at fixed address at address failed\n")); | |
| // | |
| // Allocate memory for the image being loaded from the EFI_SRAM_DESCRIPTOR | |
| // specified by SmramRange | |
| // | |
| PageCount = (UINTN)EFI_SIZE_TO_PAGES((UINTN)ImageContext.ImageSize + ImageContext.SectionAlignment); | |
| ASSERT ((SmramRange->PhysicalSize & EFI_PAGE_MASK) == 0); | |
| ASSERT (SmramRange->PhysicalSize > EFI_PAGES_TO_SIZE (PageCount)); | |
| SmramRange->PhysicalSize -= EFI_PAGES_TO_SIZE (PageCount); | |
| DestinationBuffer = SmramRange->CpuStart + SmramRange->PhysicalSize; | |
| // | |
| // Align buffer on section boundry | |
| // | |
| ImageContext.ImageAddress = DestinationBuffer; | |
| } | |
| } else { | |
| // | |
| // Allocate memory for the image being loaded from the EFI_SRAM_DESCRIPTOR | |
| // specified by SmramRange | |
| // | |
| PageCount = (UINTN)EFI_SIZE_TO_PAGES((UINTN)ImageContext.ImageSize + ImageContext.SectionAlignment); | |
| ASSERT ((SmramRange->PhysicalSize & EFI_PAGE_MASK) == 0); | |
| ASSERT (SmramRange->PhysicalSize > EFI_PAGES_TO_SIZE (PageCount)); | |
| SmramRange->PhysicalSize -= EFI_PAGES_TO_SIZE (PageCount); | |
| DestinationBuffer = SmramRange->CpuStart + SmramRange->PhysicalSize; | |
| // | |
| // Align buffer on section boundry | |
| // | |
| ImageContext.ImageAddress = DestinationBuffer; | |
| } | |
| ImageContext.ImageAddress += ImageContext.SectionAlignment - 1; | |
| ImageContext.ImageAddress &= ~(ImageContext.SectionAlignment - 1); | |
| // | |
| // Print debug message showing SMM Core load address. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL loading SMM Core at SMRAM address %p\n", (VOID *)(UINTN)ImageContext.ImageAddress)); | |
| // | |
| // Load the image to our new buffer | |
| // | |
| Status = PeCoffLoaderLoadImage (&ImageContext); | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // Relocate the image in our new buffer | |
| // | |
| Status = PeCoffLoaderRelocateImage (&ImageContext); | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // Flush the instruction cache so the image data are written before we execute it | |
| // | |
| InvalidateInstructionCacheRange ((VOID *)(UINTN)ImageContext.ImageAddress, (UINTN)ImageContext.ImageSize); | |
| // | |
| // Print debug message showing SMM Core entry point address. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL calling SMM Core at SMRAM address %p\n", (VOID *)(UINTN)ImageContext.EntryPoint)); | |
| // | |
| // Execute image | |
| // | |
| EntryPoint = (EFI_IMAGE_ENTRY_POINT)(UINTN)ImageContext.EntryPoint; | |
| Status = EntryPoint ((EFI_HANDLE)Context, gST); | |
| } | |
| } | |
| // | |
| // If the load operation, relocate operation, or the image execution return an | |
| // error, then free memory allocated from the EFI_SRAM_DESCRIPTOR specified by | |
| // SmramRange | |
| // | |
| if (EFI_ERROR (Status)) { | |
| SmramRange->PhysicalSize += EFI_PAGES_TO_SIZE (PageCount); | |
| } | |
| // | |
| // Always free memory allocted by GetFileBufferByFilePath () | |
| // | |
| FreePool (SourceBuffer); | |
| return Status; | |
| } | |
| /** | |
| The Entry Point for SMM IPL | |
| Load SMM Core into SMRAM, register SMM Core entry point for SMIs, install | |
| SMM Base 2 Protocol and SMM Communication Protocol, and register for the | |
| critical events required to coordinate between DXE and SMM environments. | |
| @param ImageHandle The firmware allocated handle for the EFI image. | |
| @param SystemTable A pointer to the EFI System Table. | |
| @retval EFI_SUCCESS The entry point is executed successfully. | |
| @retval Other Some error occurred when executing this entry point. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| SmmIplEntry ( | |
| IN EFI_HANDLE ImageHandle, | |
| IN EFI_SYSTEM_TABLE *SystemTable | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration; | |
| UINTN Size; | |
| UINTN Index; | |
| EFI_SMM_RESERVED_SMRAM_REGION *SmramResRegion; | |
| UINT64 MaxSize; | |
| VOID *Registration; | |
| UINT64 SmmCodeSize; | |
| EFI_LOAD_FIXED_ADDRESS_CONFIGURATION_TABLE *LMFAConfigurationTable; | |
| EFI_CPU_ARCH_PROTOCOL *CpuArch; | |
| // | |
| // Fill in the image handle of the SMM IPL so the SMM Core can use this as the | |
| // ParentImageHandle field of the Load Image Protocol for all SMM Drivers loaded | |
| // by the SMM Core | |
| // | |
| mSmmCorePrivateData.SmmIplImageHandle = ImageHandle; | |
| // | |
| // Get SMM Access Protocol | |
| // | |
| Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&mSmmAccess); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Get SMM Control2 Protocol | |
| // | |
| Status = gBS->LocateProtocol (&gEfiSmmControl2ProtocolGuid, NULL, (VOID **)&mSmmControl2); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Get SMM Configuration Protocol if it is present | |
| // | |
| SmmConfiguration = NULL; | |
| Status = gBS->LocateProtocol (&gEfiSmmConfigurationProtocolGuid, NULL, (VOID **) &SmmConfiguration); | |
| // | |
| // Get SMRAM information | |
| // | |
| Size = 0; | |
| Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, NULL); | |
| ASSERT (Status == EFI_BUFFER_TOO_SMALL); | |
| gSmmCorePrivate->SmramRanges = (EFI_SMRAM_DESCRIPTOR *)AllocatePool (Size); | |
| ASSERT (gSmmCorePrivate->SmramRanges != NULL); | |
| Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, gSmmCorePrivate->SmramRanges); | |
| ASSERT_EFI_ERROR (Status); | |
| gSmmCorePrivate->SmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR); | |
| // | |
| // Open all SMRAM ranges | |
| // | |
| Status = mSmmAccess->Open (mSmmAccess); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Print debug message that the SMRAM window is now open. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL opened SMRAM window\n")); | |
| // | |
| // Subtract SMRAM any reserved SMRAM regions. | |
| // | |
| if (SmmConfiguration != NULL) { | |
| SmramResRegion = SmmConfiguration->SmramReservedRegions; | |
| while (SmramResRegion->SmramReservedSize != 0) { | |
| for (Index = 0; Index < gSmmCorePrivate->SmramRangeCount; Index ++) { | |
| if ((SmramResRegion->SmramReservedStart >= gSmmCorePrivate->SmramRanges[Index].CpuStart) && \ | |
| ((SmramResRegion->SmramReservedStart + SmramResRegion->SmramReservedSize) <= \ | |
| (gSmmCorePrivate->SmramRanges[Index].CpuStart + gSmmCorePrivate->SmramRanges[Index].PhysicalSize))) { | |
| // | |
| // This range has reserved area, calculate the left free size | |
| // | |
| gSmmCorePrivate->SmramRanges[Index].PhysicalSize = SmramResRegion->SmramReservedStart - gSmmCorePrivate->SmramRanges[Index].CpuStart; | |
| } | |
| } | |
| SmramResRegion++; | |
| } | |
| } | |
| // | |
| // Find the largest SMRAM range between 1MB and 4GB that is at least 256KB - 4K in size | |
| // | |
| mCurrentSmramRange = NULL; | |
| for (Index = 0, MaxSize = SIZE_256KB - EFI_PAGE_SIZE; Index < gSmmCorePrivate->SmramRangeCount; Index++) { | |
| // | |
| // Skip any SMRAM region that is already allocated, needs testing, or needs ECC initialization | |
| // | |
| if ((gSmmCorePrivate->SmramRanges[Index].RegionState & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) != 0) { | |
| continue; | |
| } | |
| if (gSmmCorePrivate->SmramRanges[Index].CpuStart >= BASE_1MB) { | |
| if ((gSmmCorePrivate->SmramRanges[Index].CpuStart + gSmmCorePrivate->SmramRanges[Index].PhysicalSize) <= BASE_4GB) { | |
| if (gSmmCorePrivate->SmramRanges[Index].PhysicalSize >= MaxSize) { | |
| MaxSize = gSmmCorePrivate->SmramRanges[Index].PhysicalSize; | |
| mCurrentSmramRange = &gSmmCorePrivate->SmramRanges[Index]; | |
| } | |
| } | |
| } | |
| } | |
| if (mCurrentSmramRange != NULL) { | |
| // | |
| // Print debug message showing SMRAM window that will be used by SMM IPL and SMM Core | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL found SMRAM window %p - %p\n", | |
| (VOID *)(UINTN)mCurrentSmramRange->CpuStart, | |
| (VOID *)(UINTN)(mCurrentSmramRange->CpuStart + mCurrentSmramRange->PhysicalSize - 1) | |
| )); | |
| GetSmramCacheRange (mCurrentSmramRange, &mSmramCacheBase, &mSmramCacheSize); | |
| // | |
| // If CPU AP is present, attempt to set SMRAM cacheability to WB | |
| // Note that it is expected that cacheability of SMRAM has been set to WB if CPU AP | |
| // is not available here. | |
| // | |
| CpuArch = NULL; | |
| Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&CpuArch); | |
| if (!EFI_ERROR (Status)) { | |
| Status = gDS->SetMemorySpaceAttributes( | |
| mSmramCacheBase, | |
| mSmramCacheSize, | |
| EFI_MEMORY_WB | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((DEBUG_WARN, "SMM IPL failed to set SMRAM window to EFI_MEMORY_WB\n")); | |
| } | |
| } | |
| // | |
| // if Loading module at Fixed Address feature is enabled, save the SMRAM base to Load | |
| // Modules At Fixed Address Configuration Table. | |
| // | |
| if (PcdGet64(PcdLoadModuleAtFixAddressEnable) != 0) { | |
| // | |
| // Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber | |
| // | |
| SmmCodeSize = LShiftU64 (PcdGet32(PcdLoadFixAddressSmmCodePageNumber), EFI_PAGE_SHIFT); | |
| // | |
| // The SMRAM available memory is assumed to be larger than SmmCodeSize | |
| // | |
| ASSERT (mCurrentSmramRange->PhysicalSize > SmmCodeSize); | |
| // | |
| // Retrieve Load modules At fixed address configuration table and save the SMRAM base. | |
| // | |
| Status = EfiGetSystemConfigurationTable ( | |
| &gLoadFixedAddressConfigurationTableGuid, | |
| (VOID **) &LMFAConfigurationTable | |
| ); | |
| if (!EFI_ERROR (Status) && LMFAConfigurationTable != NULL) { | |
| LMFAConfigurationTable->SmramBase = mCurrentSmramRange->CpuStart; | |
| // | |
| // Print the SMRAM base | |
| // | |
| DEBUG ((EFI_D_INFO, "LOADING MODULE FIXED INFO: TSEG BASE is %x. \n", LMFAConfigurationTable->SmramBase)); | |
| } | |
| } | |
| // | |
| // Load SMM Core into SMRAM and execute it from SMRAM | |
| // | |
| Status = ExecuteSmmCoreFromSmram (mCurrentSmramRange, gSmmCorePrivate); | |
| if (EFI_ERROR (Status)) { | |
| // | |
| // Print error message that the SMM Core failed to be loaded and executed. | |
| // | |
| DEBUG ((DEBUG_ERROR, "SMM IPL could not load and execute SMM Core from SMRAM\n")); | |
| // | |
| // Attempt to reset SMRAM cacheability to UC | |
| // | |
| if (CpuArch != NULL) { | |
| Status = gDS->SetMemorySpaceAttributes( | |
| mSmramCacheBase, | |
| mSmramCacheSize, | |
| EFI_MEMORY_UC | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((DEBUG_WARN, "SMM IPL failed to reset SMRAM window to EFI_MEMORY_UC\n")); | |
| } | |
| } | |
| } | |
| } else { | |
| // | |
| // Print error message that there are not enough SMRAM resources to load the SMM Core. | |
| // | |
| DEBUG ((DEBUG_ERROR, "SMM IPL could not find a large enough SMRAM region to load SMM Core\n")); | |
| } | |
| // | |
| // If the SMM Core could not be loaded then close SMRAM window, free allocated | |
| // resources, and return an error so SMM IPL will be unloaded. | |
| // | |
| if (mCurrentSmramRange == NULL || EFI_ERROR (Status)) { | |
| // | |
| // Close all SMRAM ranges | |
| // | |
| Status = mSmmAccess->Close (mSmmAccess); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Print debug message that the SMRAM window is now closed. | |
| // | |
| DEBUG ((DEBUG_INFO, "SMM IPL closed SMRAM window\n")); | |
| // | |
| // Free all allocated resources | |
| // | |
| FreePool (gSmmCorePrivate->SmramRanges); | |
| return EFI_UNSUPPORTED; | |
| } | |
| // | |
| // Install SMM Base2 Protocol and SMM Communication Protocol | |
| // | |
| Status = gBS->InstallMultipleProtocolInterfaces ( | |
| &mSmmIplHandle, | |
| &gEfiSmmBase2ProtocolGuid, &mSmmBase2, | |
| &gEfiSmmCommunicationProtocolGuid, &mSmmCommunication, | |
| NULL | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Create the set of protocol and event notififcations that the SMM IPL requires | |
| // | |
| for (Index = 0; mSmmIplEvents[Index].NotifyFunction != NULL; Index++) { | |
| if (mSmmIplEvents[Index].Protocol) { | |
| mSmmIplEvents[Index].Event = EfiCreateProtocolNotifyEvent ( | |
| mSmmIplEvents[Index].Guid, | |
| mSmmIplEvents[Index].NotifyTpl, | |
| mSmmIplEvents[Index].NotifyFunction, | |
| mSmmIplEvents[Index].NotifyContext, | |
| &Registration | |
| ); | |
| } else { | |
| Status = gBS->CreateEventEx ( | |
| EVT_NOTIFY_SIGNAL, | |
| mSmmIplEvents[Index].NotifyTpl, | |
| mSmmIplEvents[Index].NotifyFunction, | |
| mSmmIplEvents[Index].NotifyContext, | |
| mSmmIplEvents[Index].Guid, | |
| &mSmmIplEvents[Index].Event | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| } | |
| } | |
| return EFI_SUCCESS; | |
| } |