MdeModulePkg/Universal/ReportStatusCodeRouter/RuntimeDxe/ReportStatusCodeRouterRuntimeDxe.c - edk2 - Git at Google

 /** @file
   Report Status Code Router Driver which produces Report Stataus Code Handler Protocol
   and Status Code Runtime Protocol.

   Copyright (c) 2009 - 2011, 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 "ReportStatusCodeRouterRuntimeDxe.h"

 EFI_HANDLE   mHandle                    = NULL;
 LIST_ENTRY   mCallbackListHead          = INITIALIZE_LIST_HEAD_VARIABLE (mCallbackListHead);
 EFI_EVENT    mVirtualAddressChangeEvent = NULL;

 //
 // Report operation nest status.
 // If it is set, then the report operation has nested.
 //
 UINT32       mStatusCodeNestStatus = 0;

 EFI_STATUS_CODE_PROTOCOL  mStatusCodeProtocol  = {
   ReportDispatcher
 };

 EFI_RSC_HANDLER_PROTOCOL  mRscHandlerProtocol = {
   Register,
   Unregister
   };

 /**
   Event callback function to invoke status code handler in list.

   @param  Event         Event whose notification function is being invoked.
   @param  Context       Pointer to the notification function's context, which is
                         always zero in current implementation.

 **/
 VOID
 EFIAPI
 RscHandlerNotification (
   IN EFI_EVENT        Event,
   IN VOID             *Context
   )
 {
   RSC_HANDLER_CALLBACK_ENTRY  *CallbackEntry;
   EFI_PHYSICAL_ADDRESS        Address;
   RSC_DATA_ENTRY              *RscData;

   CallbackEntry = (RSC_HANDLER_CALLBACK_ENTRY *) Context;

   //
   // Traverse the status code data buffer to parse all
   // data to report.
   //
   Address = CallbackEntry->StatusCodeDataBuffer;
   while (Address < CallbackEntry->EndPointer) {
     RscData = (RSC_DATA_ENTRY *) (UINTN) Address;
     CallbackEntry->RscHandlerCallback (
                      RscData->Type,
                      RscData->Value,
                      RscData->Instance,
                      &RscData->CallerId,
                      &RscData->Data
                      );

     Address += (sizeof (RSC_DATA_ENTRY) + RscData->Data.Size);
     Address  = ALIGN_VARIABLE (Address);
   }

   CallbackEntry->EndPointer = CallbackEntry->StatusCodeDataBuffer;
 }

 /**
   Register the callback function for ReportStatusCode() notification.

   When this function is called the function pointer is added to an internal list and any future calls to
   ReportStatusCode() will be forwarded to the Callback function. During the bootservices,
   this is the callback for which this service can be invoked. The report status code router
   will create an event such that the callback function is only invoked at the TPL for which it was
   registered. The entity that registers for the callback should also register for an event upon
   generation of exit boot services and invoke the unregister service.
   If the handler does not have a TPL dependency, it should register for a callback at TPL high. The
   router infrastructure will support making callbacks at runtime, but the caller for runtime invocation
   must meet the following criteria:
   1. must be a runtime driver type so that its memory is not reclaimed
   2. not unregister at exit boot services so that the router will still have its callback address
   3. the caller must be self-contained (eg. Not call out into any boot-service interfaces) and be
   runtime safe, in general.

   @param[in] Callback   A pointer to a function of type EFI_RSC_HANDLER_CALLBACK that is called when
                         a call to ReportStatusCode() occurs.
   @param[in] Tpl        TPL at which callback can be safely invoked.

   @retval  EFI_SUCCESS              Function was successfully registered.
   @retval  EFI_INVALID_PARAMETER    The callback function was NULL.
   @retval  EFI_OUT_OF_RESOURCES     The internal buffer ran out of space. No more functions can be
                                     registered.
   @retval  EFI_ALREADY_STARTED      The function was already registered. It can't be registered again.

 **/
 EFI_STATUS
 EFIAPI
 Register (
   IN EFI_RSC_HANDLER_CALLBACK   Callback,
   IN EFI_TPL                    Tpl
   )
 {
   EFI_STATUS                    Status;
   LIST_ENTRY                    *Link;
   RSC_HANDLER_CALLBACK_ENTRY    *CallbackEntry;

   if (Callback == NULL) {
     return EFI_INVALID_PARAMETER;
   }

   for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
     CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
     if (CallbackEntry->RscHandlerCallback == Callback) {
       //
       // If the function was already registered. It can't be registered again.
       //
       return EFI_ALREADY_STARTED;
     }
   }

   CallbackEntry = AllocateRuntimeZeroPool (sizeof (RSC_HANDLER_CALLBACK_ENTRY));
   ASSERT (CallbackEntry != NULL);

   CallbackEntry->Signature          = RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE;
   CallbackEntry->RscHandlerCallback = Callback;
   CallbackEntry->Tpl                = Tpl;

   //
   // If TPL of registered callback funtion is not TPL_HIGH_LEVEL, then event should be created
   // for it, and related buffer for status code data should be prepared.
   // Here the data buffer must be prepared in advance, because Report Status Code Protocol might
   // be invoked under TPL_HIGH_LEVEL and no memory allocation is allowed then.
   // If TPL is TPL_HIGH_LEVEL, then all status code will be reported immediately, without data
   // buffer and event trigger.
   //
   if (Tpl != TPL_HIGH_LEVEL) {
     CallbackEntry->StatusCodeDataBuffer = (EFI_PHYSICAL_ADDRESS) (UINTN) AllocatePool (EFI_PAGE_SIZE);
     CallbackEntry->BufferSize           = EFI_PAGE_SIZE;
     CallbackEntry->EndPointer           = CallbackEntry->StatusCodeDataBuffer;
     Status = gBS->CreateEvent (
                     EVT_NOTIFY_SIGNAL,
                     Tpl,
                     RscHandlerNotification,
                     CallbackEntry,
                     &CallbackEntry->Event
                     );
     ASSERT_EFI_ERROR (Status);
   }

   InsertTailList (&mCallbackListHead, &CallbackEntry->Node);

   return EFI_SUCCESS;
 }

 /**
   Remove a previously registered callback function from the notification list.

   A callback function must be unregistered before it is deallocated. It is important that any registered
   callbacks that are not runtime complaint be unregistered when ExitBootServices() is called.

   @param[in]  Callback  A pointer to a function of type EFI_RSC_HANDLER_CALLBACK that is to be
                         unregistered.

   @retval EFI_SUCCESS           The function was successfully unregistered.
   @retval EFI_INVALID_PARAMETER The callback function was NULL.
   @retval EFI_NOT_FOUND         The callback function was not found to be unregistered.

 **/
 EFI_STATUS
 EFIAPI
 Unregister (
   IN EFI_RSC_HANDLER_CALLBACK Callback
   )
 {
   LIST_ENTRY                    *Link;
   RSC_HANDLER_CALLBACK_ENTRY    *CallbackEntry;

   if (Callback == NULL) {
     return EFI_INVALID_PARAMETER;
   }

   for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
     CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
     if (CallbackEntry->RscHandlerCallback == Callback) {
       //
       // If the function is found in list, delete it and return.
       //
       if (CallbackEntry->Tpl != TPL_HIGH_LEVEL) {
         FreePool ((VOID *) (UINTN) CallbackEntry->StatusCodeDataBuffer);
         gBS->CloseEvent (CallbackEntry->Event);
       }
       RemoveEntryList (&CallbackEntry->Node);
       FreePool (CallbackEntry);
       return EFI_SUCCESS;
     }
   }

   return EFI_NOT_FOUND;
 }

 /**
   Provides an interface that a software module can call to report a status code.

   @param  Type             Indicates the type of status code being reported.
   @param  Value            Describes the current status of a hardware or software entity.
                            This included information about the class and subclass that is used to
                            classify the entity as well as an operation.
   @param  Instance         The enumeration of a hardware or software entity within
                            the system. Valid instance numbers start with 1.
   @param  CallerId         This optional parameter may be used to identify the caller.
                            This parameter allows the status code driver to apply different rules to
                            different callers.
   @param  Data             This optional parameter may be used to pass additional data.

   @retval EFI_SUCCESS           The function completed successfully
   @retval EFI_DEVICE_ERROR      The function should not be completed due to a device error.

 **/
 EFI_STATUS
 EFIAPI
 ReportDispatcher (
   IN EFI_STATUS_CODE_TYPE     Type,
   IN EFI_STATUS_CODE_VALUE    Value,
   IN UINT32                   Instance,
   IN EFI_GUID                 *CallerId  OPTIONAL,
   IN EFI_STATUS_CODE_DATA     *Data      OPTIONAL
   )
 {
   LIST_ENTRY                    *Link;
   RSC_HANDLER_CALLBACK_ENTRY    *CallbackEntry;
   RSC_DATA_ENTRY                *RscData;
   EFI_STATUS                    Status;
   VOID                          *NewBuffer;

   //
   // Use atom operation to avoid the reentant of report.
   // If current status is not zero, then the function is reentrancy.
   //
   if (InterlockedCompareExchange32 (&mStatusCodeNestStatus, 0, 1) == 1) {
     return EFI_DEVICE_ERROR;
   }

   for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link);) {
     CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
     //
     // The handler may remove itself, so get the next handler in advance.
     //
     Link = GetNextNode (&mCallbackListHead, Link);
     if ((CallbackEntry->Tpl == TPL_HIGH_LEVEL) || EfiAtRuntime ()) {
       CallbackEntry->RscHandlerCallback (
                        Type,
                        Value,
                        Instance,
                        CallerId,
                        Data
                        );
       continue;
     }

     //
     // If callback is registered with TPL lower than TPL_HIGH_LEVEL, event must be signaled at boot time to possibly wait for
     // allowed TPL to report status code. Related data should also be stored in data buffer.
     //
     CallbackEntry->EndPointer  = ALIGN_VARIABLE (CallbackEntry->EndPointer);
     RscData = (RSC_DATA_ENTRY *) (UINTN) CallbackEntry->EndPointer;
     CallbackEntry->EndPointer += sizeof (RSC_DATA_ENTRY);
     if (Data != NULL) {
       CallbackEntry->EndPointer += Data->Size;
     }

     //
     // If data buffer is about to be used up (7/8 here), try to reallocate a buffer with double size, if not at TPL_HIGH_LEVEL.
     //
     if (CallbackEntry->EndPointer > (CallbackEntry->StatusCodeDataBuffer + (CallbackEntry->BufferSize / 8) * 7)) {
       if (EfiGetCurrentTpl () < TPL_HIGH_LEVEL) {
         NewBuffer = ReallocatePool (
                       CallbackEntry->BufferSize,
                       CallbackEntry->BufferSize * 2,
                       (VOID *) (UINTN) CallbackEntry->StatusCodeDataBuffer
                       );
         if (NewBuffer != NULL) {
           CallbackEntry->EndPointer = (EFI_PHYSICAL_ADDRESS) (UINTN) NewBuffer + (CallbackEntry->EndPointer - CallbackEntry->StatusCodeDataBuffer);
           CallbackEntry->StatusCodeDataBuffer = (EFI_PHYSICAL_ADDRESS) (UINTN) NewBuffer;
           CallbackEntry->BufferSize *= 2;
         }
       }
     }

     //
     // If data buffer is used up, do not report for this time.
     //
     if (CallbackEntry->EndPointer > (CallbackEntry->StatusCodeDataBuffer + CallbackEntry->BufferSize)) {
       continue;
     }

     RscData->Type      = Type;
     RscData->Value     = Value;
     RscData->Instance  = Instance;
     if (CallerId != NULL) {
       CopyGuid (&RscData->CallerId, CallerId);
     }
     if (Data != NULL) {
       CopyMem (&RscData->Data, Data, Data->HeaderSize + Data->Size);
     }

     Status = gBS->SignalEvent (CallbackEntry->Event);
     ASSERT_EFI_ERROR (Status);
   }

   //
   // Restore the nest status of report
   //
   InterlockedCompareExchange32 (&mStatusCodeNestStatus, 1, 0);

   return EFI_SUCCESS;
 }

 /**
   Virtual address change notification call back. It converts global pointer
   to virtual address.

   @param  Event         Event whose notification function is being invoked.
   @param  Context       Pointer to the notification function's context, which is
                         always zero in current implementation.

 **/
 VOID
 EFIAPI
 VirtualAddressChangeCallBack (
   IN EFI_EVENT        Event,
   IN VOID             *Context
   )
 {
   EFI_STATUS					Status;
   LIST_ENTRY                    *Link;
   RSC_HANDLER_CALLBACK_ENTRY    *CallbackEntry;

   for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
     CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
     Status = EfiConvertFunctionPointer (0, (VOID **) &CallbackEntry->RscHandlerCallback);
     ASSERT_EFI_ERROR (Status);
   }

   Status = EfiConvertList (
              0,
              &mCallbackListHead
              );
   ASSERT_EFI_ERROR (Status);
 }

 /**
   Entry point of Generic Status Code Driver.

   This function is the entry point of this Generic Status Code Driver.
   It installs eport Stataus Code Handler Protocol  and Status Code Runtime Protocol,
   and registers event for EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.

   @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.

 **/
 EFI_STATUS
 EFIAPI
 GenericStatusCodeRuntimeDxeEntry (
   IN EFI_HANDLE         ImageHandle,
   IN EFI_SYSTEM_TABLE   *SystemTable
   )
 {
   EFI_STATUS     Status;

   Status = gBS->InstallMultipleProtocolInterfaces (
                   &mHandle,
                   &gEfiRscHandlerProtocolGuid,
                   &mRscHandlerProtocol,
                   &gEfiStatusCodeRuntimeProtocolGuid,
                   &mStatusCodeProtocol,
                   NULL
                   );
   ASSERT_EFI_ERROR (Status);

   Status = gBS->CreateEventEx (
                   EVT_NOTIFY_SIGNAL,
                   TPL_NOTIFY,
                   VirtualAddressChangeCallBack,
                   NULL,
                   &gEfiEventVirtualAddressChangeGuid,
                   &mVirtualAddressChangeEvent
                   );
   ASSERT_EFI_ERROR (Status);

   return EFI_SUCCESS;
 }
	/** @file
	Report Status Code Router Driver which produces Report Stataus Code Handler Protocol
	and Status Code Runtime Protocol.

	Copyright (c) 2009 - 2011, 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 "ReportStatusCodeRouterRuntimeDxe.h"

	EFI_HANDLE mHandle = NULL;
	LIST_ENTRY mCallbackListHead = INITIALIZE_LIST_HEAD_VARIABLE (mCallbackListHead);
	EFI_EVENT mVirtualAddressChangeEvent = NULL;

	//
	// Report operation nest status.
	// If it is set, then the report operation has nested.
	//
	UINT32 mStatusCodeNestStatus = 0;

	EFI_STATUS_CODE_PROTOCOL mStatusCodeProtocol = {
	ReportDispatcher
	};

	EFI_RSC_HANDLER_PROTOCOL mRscHandlerProtocol = {
	Register,
	Unregister
	};

	/**
	Event callback function to invoke status code handler in list.

	@param Event Event whose notification function is being invoked.
	@param Context Pointer to the notification function's context, which is
	always zero in current implementation.

	**/
	VOID
	EFIAPI
	RscHandlerNotification (
	IN EFI_EVENT Event,
	IN VOID *Context
	)
	{
	RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;
	EFI_PHYSICAL_ADDRESS Address;
	RSC_DATA_ENTRY *RscData;

	CallbackEntry = (RSC_HANDLER_CALLBACK_ENTRY *) Context;

	//
	// Traverse the status code data buffer to parse all
	// data to report.
	//
	Address = CallbackEntry->StatusCodeDataBuffer;
	while (Address < CallbackEntry->EndPointer) {
	RscData = (RSC_DATA_ENTRY *) (UINTN) Address;
	CallbackEntry->RscHandlerCallback (
	RscData->Type,
	RscData->Value,
	RscData->Instance,
	&RscData->CallerId,
	&RscData->Data
	);

	Address += (sizeof (RSC_DATA_ENTRY) + RscData->Data.Size);
	Address = ALIGN_VARIABLE (Address);
	}

	CallbackEntry->EndPointer = CallbackEntry->StatusCodeDataBuffer;
	}

	/**
	Register the callback function for ReportStatusCode() notification.

	When this function is called the function pointer is added to an internal list and any future calls to
	ReportStatusCode() will be forwarded to the Callback function. During the bootservices,
	this is the callback for which this service can be invoked. The report status code router
	will create an event such that the callback function is only invoked at the TPL for which it was
	registered. The entity that registers for the callback should also register for an event upon
	generation of exit boot services and invoke the unregister service.
	If the handler does not have a TPL dependency, it should register for a callback at TPL high. The
	router infrastructure will support making callbacks at runtime, but the caller for runtime invocation
	must meet the following criteria:
	1. must be a runtime driver type so that its memory is not reclaimed
	2. not unregister at exit boot services so that the router will still have its callback address
	3. the caller must be self-contained (eg. Not call out into any boot-service interfaces) and be
	runtime safe, in general.

	@param[in] Callback A pointer to a function of type EFI_RSC_HANDLER_CALLBACK that is called when
	a call to ReportStatusCode() occurs.
	@param[in] Tpl TPL at which callback can be safely invoked.

	@retval EFI_SUCCESS Function was successfully registered.
	@retval EFI_INVALID_PARAMETER The callback function was NULL.
	@retval EFI_OUT_OF_RESOURCES The internal buffer ran out of space. No more functions can be
	registered.
	@retval EFI_ALREADY_STARTED The function was already registered. It can't be registered again.

	**/
	EFI_STATUS
	EFIAPI
	Register (
	IN EFI_RSC_HANDLER_CALLBACK Callback,
	IN EFI_TPL Tpl
	)
	{
	EFI_STATUS Status;
	LIST_ENTRY *Link;
	RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;

	if (Callback == NULL) {
	return EFI_INVALID_PARAMETER;
	}

	for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
	CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
	if (CallbackEntry->RscHandlerCallback == Callback) {
	//
	// If the function was already registered. It can't be registered again.
	//
	return EFI_ALREADY_STARTED;
	}
	}

	CallbackEntry = AllocateRuntimeZeroPool (sizeof (RSC_HANDLER_CALLBACK_ENTRY));
	ASSERT (CallbackEntry != NULL);

	CallbackEntry->Signature = RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE;
	CallbackEntry->RscHandlerCallback = Callback;
	CallbackEntry->Tpl = Tpl;

	//
	// If TPL of registered callback funtion is not TPL_HIGH_LEVEL, then event should be created
	// for it, and related buffer for status code data should be prepared.
	// Here the data buffer must be prepared in advance, because Report Status Code Protocol might
	// be invoked under TPL_HIGH_LEVEL and no memory allocation is allowed then.
	// If TPL is TPL_HIGH_LEVEL, then all status code will be reported immediately, without data
	// buffer and event trigger.
	//
	if (Tpl != TPL_HIGH_LEVEL) {
	CallbackEntry->StatusCodeDataBuffer = (EFI_PHYSICAL_ADDRESS) (UINTN) AllocatePool (EFI_PAGE_SIZE);
	CallbackEntry->BufferSize = EFI_PAGE_SIZE;
	CallbackEntry->EndPointer = CallbackEntry->StatusCodeDataBuffer;
	Status = gBS->CreateEvent (
	EVT_NOTIFY_SIGNAL,
	Tpl,
	RscHandlerNotification,
	CallbackEntry,
	&CallbackEntry->Event
	);
	ASSERT_EFI_ERROR (Status);
	}

	InsertTailList (&mCallbackListHead, &CallbackEntry->Node);

	return EFI_SUCCESS;
	}

	/**
	Remove a previously registered callback function from the notification list.

	A callback function must be unregistered before it is deallocated. It is important that any registered
	callbacks that are not runtime complaint be unregistered when ExitBootServices() is called.

	@param[in] Callback A pointer to a function of type EFI_RSC_HANDLER_CALLBACK that is to be
	unregistered.

	@retval EFI_SUCCESS The function was successfully unregistered.
	@retval EFI_INVALID_PARAMETER The callback function was NULL.
	@retval EFI_NOT_FOUND The callback function was not found to be unregistered.

	**/
	EFI_STATUS
	EFIAPI
	Unregister (
	IN EFI_RSC_HANDLER_CALLBACK Callback
	)
	{
	LIST_ENTRY *Link;
	RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;

	if (Callback == NULL) {
	return EFI_INVALID_PARAMETER;
	}

	for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
	CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
	if (CallbackEntry->RscHandlerCallback == Callback) {
	//
	// If the function is found in list, delete it and return.
	//
	if (CallbackEntry->Tpl != TPL_HIGH_LEVEL) {
	FreePool ((VOID *) (UINTN) CallbackEntry->StatusCodeDataBuffer);
	gBS->CloseEvent (CallbackEntry->Event);
	}
	RemoveEntryList (&CallbackEntry->Node);
	FreePool (CallbackEntry);
	return EFI_SUCCESS;
	}
	}

	return EFI_NOT_FOUND;
	}

	/**
	Provides an interface that a software module can call to report a status code.

	@param Type Indicates the type of status code being reported.
	@param Value Describes the current status of a hardware or software entity.
	This included information about the class and subclass that is used to
	classify the entity as well as an operation.
	@param Instance The enumeration of a hardware or software entity within
	the system. Valid instance numbers start with 1.
	@param CallerId This optional parameter may be used to identify the caller.
	This parameter allows the status code driver to apply different rules to
	different callers.
	@param Data This optional parameter may be used to pass additional data.

	@retval EFI_SUCCESS The function completed successfully
	@retval EFI_DEVICE_ERROR The function should not be completed due to a device error.

	**/
	EFI_STATUS
	EFIAPI
	ReportDispatcher (
	IN EFI_STATUS_CODE_TYPE Type,
	IN EFI_STATUS_CODE_VALUE Value,
	IN UINT32 Instance,
	IN EFI_GUID *CallerId OPTIONAL,
	IN EFI_STATUS_CODE_DATA *Data OPTIONAL
	)
	{
	LIST_ENTRY *Link;
	RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;
	RSC_DATA_ENTRY *RscData;
	EFI_STATUS Status;
	VOID *NewBuffer;

	//
	// Use atom operation to avoid the reentant of report.
	// If current status is not zero, then the function is reentrancy.
	//
	if (InterlockedCompareExchange32 (&mStatusCodeNestStatus, 0, 1) == 1) {
	return EFI_DEVICE_ERROR;
	}

	for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link);) {
	CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
	//
	// The handler may remove itself, so get the next handler in advance.
	//
	Link = GetNextNode (&mCallbackListHead, Link);
	if ((CallbackEntry->Tpl == TPL_HIGH_LEVEL) \|\| EfiAtRuntime ()) {
	CallbackEntry->RscHandlerCallback (
	Type,
	Value,
	Instance,
	CallerId,
	Data
	);
	continue;
	}

	//
	// If callback is registered with TPL lower than TPL_HIGH_LEVEL, event must be signaled at boot time to possibly wait for
	// allowed TPL to report status code. Related data should also be stored in data buffer.
	//
	CallbackEntry->EndPointer = ALIGN_VARIABLE (CallbackEntry->EndPointer);
	RscData = (RSC_DATA_ENTRY *) (UINTN) CallbackEntry->EndPointer;
	CallbackEntry->EndPointer += sizeof (RSC_DATA_ENTRY);
	if (Data != NULL) {
	CallbackEntry->EndPointer += Data->Size;
	}

	//
	// If data buffer is about to be used up (7/8 here), try to reallocate a buffer with double size, if not at TPL_HIGH_LEVEL.
	//
	if (CallbackEntry->EndPointer > (CallbackEntry->StatusCodeDataBuffer + (CallbackEntry->BufferSize / 8) * 7)) {
	if (EfiGetCurrentTpl () < TPL_HIGH_LEVEL) {
	NewBuffer = ReallocatePool (
	CallbackEntry->BufferSize,
	CallbackEntry->BufferSize * 2,
	(VOID *) (UINTN) CallbackEntry->StatusCodeDataBuffer
	);
	if (NewBuffer != NULL) {
	CallbackEntry->EndPointer = (EFI_PHYSICAL_ADDRESS) (UINTN) NewBuffer + (CallbackEntry->EndPointer - CallbackEntry->StatusCodeDataBuffer);
	CallbackEntry->StatusCodeDataBuffer = (EFI_PHYSICAL_ADDRESS) (UINTN) NewBuffer;
	CallbackEntry->BufferSize *= 2;
	}
	}
	}

	//
	// If data buffer is used up, do not report for this time.
	//
	if (CallbackEntry->EndPointer > (CallbackEntry->StatusCodeDataBuffer + CallbackEntry->BufferSize)) {
	continue;
	}

	RscData->Type = Type;
	RscData->Value = Value;
	RscData->Instance = Instance;
	if (CallerId != NULL) {
	CopyGuid (&RscData->CallerId, CallerId);
	}
	if (Data != NULL) {
	CopyMem (&RscData->Data, Data, Data->HeaderSize + Data->Size);
	}

	Status = gBS->SignalEvent (CallbackEntry->Event);
	ASSERT_EFI_ERROR (Status);
	}

	//
	// Restore the nest status of report
	//
	InterlockedCompareExchange32 (&mStatusCodeNestStatus, 1, 0);

	return EFI_SUCCESS;
	}

	/**
	Virtual address change notification call back. It converts global pointer
	to virtual address.

	@param Event Event whose notification function is being invoked.
	@param Context Pointer to the notification function's context, which is
	always zero in current implementation.

	**/
	VOID
	EFIAPI
	VirtualAddressChangeCallBack (
	IN EFI_EVENT Event,
	IN VOID *Context
	)
	{
	EFI_STATUS Status;
	LIST_ENTRY *Link;
	RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;

	for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
	CallbackEntry = CR (Link, RSC_HANDLER_CALLBACK_ENTRY, Node, RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
	Status = EfiConvertFunctionPointer (0, (VOID **) &CallbackEntry->RscHandlerCallback);
	ASSERT_EFI_ERROR (Status);
	}

	Status = EfiConvertList (
	0,
	&mCallbackListHead
	);
	ASSERT_EFI_ERROR (Status);
	}

	/**
	Entry point of Generic Status Code Driver.

	This function is the entry point of this Generic Status Code Driver.
	It installs eport Stataus Code Handler Protocol and Status Code Runtime Protocol,
	and registers event for EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.

	@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.

	**/
	EFI_STATUS
	EFIAPI
	GenericStatusCodeRuntimeDxeEntry (
	IN EFI_HANDLE ImageHandle,
	IN EFI_SYSTEM_TABLE *SystemTable
	)
	{
	EFI_STATUS Status;

	Status = gBS->InstallMultipleProtocolInterfaces (
	&mHandle,
	&gEfiRscHandlerProtocolGuid,
	&mRscHandlerProtocol,
	&gEfiStatusCodeRuntimeProtocolGuid,
	&mStatusCodeProtocol,
	NULL
	);
	ASSERT_EFI_ERROR (Status);

	Status = gBS->CreateEventEx (
	EVT_NOTIFY_SIGNAL,
	TPL_NOTIFY,
	VirtualAddressChangeCallBack,
	NULL,
	&gEfiEventVirtualAddressChangeGuid,
	&mVirtualAddressChangeEvent
	);
	ASSERT_EFI_ERROR (Status);

	return EFI_SUCCESS;
	}