[mirror_edk2.git] / MdeModulePkg / Core / PiSmmCore / Smi.c

/** @file\r
  SMI management.\r
\r
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "PiSmmCore.h"\r
\r
LIST_ENTRY  mSmiEntryList       = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);\r
\r
SMI_ENTRY   mRootSmiEntry = {\r
  SMI_ENTRY_SIGNATURE,\r
  INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.AllEntries),\r
  {0},\r
  INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.SmiHandlers),\r
};\r
\r
/**\r
  Finds the SMI entry for the requested handler type.\r
\r
  @param  HandlerType            The type of the interrupt\r
  @param  Create                 Create a new entry if not found\r
\r
  @return SMI entry\r
\r
**/\r
SMI_ENTRY  *\r
EFIAPI\r
SmmCoreFindSmiEntry (\r
  IN EFI_GUID  *HandlerType,\r
  IN BOOLEAN   Create\r
  )\r
{\r
  LIST_ENTRY  *Link;\r
  SMI_ENTRY   *Item;\r
  SMI_ENTRY   *SmiEntry;\r
\r
  //\r
  // Search the SMI entry list for the matching GUID\r
  //\r
  SmiEntry = NULL;\r
  for (Link = mSmiEntryList.ForwardLink;\r
       Link != &mSmiEntryList;\r
       Link = Link->ForwardLink) {\r
\r
    Item = CR (Link, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r
    if (CompareGuid (&Item->HandlerType, HandlerType)) {\r
      //\r
      // This is the SMI entry\r
      //\r
      SmiEntry = Item;\r
      break;\r
    }\r
  }\r
\r
  //\r
  // If the protocol entry was not found and Create is TRUE, then\r
  // allocate a new entry\r
  //\r
  if ((SmiEntry == NULL) && Create) {\r
    SmiEntry = AllocatePool (sizeof(SMI_ENTRY));\r
    if (SmiEntry != NULL) {\r
      //\r
      // Initialize new SMI entry structure\r
      //\r
      SmiEntry->Signature = SMI_ENTRY_SIGNATURE;\r
      CopyGuid ((VOID *)&SmiEntry->HandlerType, HandlerType);\r
      InitializeListHead (&SmiEntry->SmiHandlers);\r
\r
      //\r
      // Add it to SMI entry list\r
      //\r
      InsertTailList (&mSmiEntryList, &SmiEntry->AllEntries);\r
    }\r
  }\r
  return SmiEntry;\r
}\r
\r
/**\r
  Manage SMI of a particular type.\r
\r
  @param  HandlerType    Points to the handler type or NULL for root SMI handlers.\r
  @param  Context        Points to an optional context buffer.\r
  @param  CommBuffer     Points to the optional communication buffer.\r
  @param  CommBufferSize Points to the size of the optional communication buffer.\r
\r
  @retval EFI_WARN_INTERRUPT_SOURCE_PENDING  Interrupt source was processed successfully but not quiesced.\r
  @retval EFI_INTERRUPT_PENDING              One or more SMI sources could not be quiesced.\r
  @retval EFI_NOT_FOUND                      Interrupt source was not handled or quiesced.\r
  @retval EFI_SUCCESS                        Interrupt source was handled and quiesced.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SmiManage (\r
  IN     CONST EFI_GUID  *HandlerType,\r
  IN     CONST VOID      *Context         OPTIONAL,\r
  IN OUT VOID            *CommBuffer      OPTIONAL,\r
  IN OUT UINTN           *CommBufferSize  OPTIONAL\r
  )\r
{\r
  LIST_ENTRY   *Link;\r
  LIST_ENTRY   *Head;\r
  SMI_ENTRY    *SmiEntry;\r
  SMI_HANDLER  *SmiHandler;\r
  BOOLEAN      SuccessReturn;\r
  EFI_STATUS   Status;\r
\r
  Status = EFI_NOT_FOUND;\r
  SuccessReturn = FALSE;\r
  if (HandlerType == NULL) {\r
    //\r
    // Root SMI handler\r
    //\r
    SmiEntry = &mRootSmiEntry;\r
  } else {\r
    //\r
    // Non-root SMI handler\r
    //\r
    SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, FALSE);\r
    if (SmiEntry == NULL) {\r
      //\r
      // There is no handler registered for this interrupt source\r
      //\r
      return Status;\r
    }\r
  }\r
  Head = &SmiEntry->SmiHandlers;\r
\r
  for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r
    SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
\r
    Status = SmiHandler->Handler (\r
               (EFI_HANDLE) SmiHandler,\r
               Context,\r
               CommBuffer,\r
               CommBufferSize\r
               );\r
\r
    switch (Status) {\r
    case EFI_INTERRUPT_PENDING:\r
      //\r
      // If a handler returns EFI_INTERRUPT_PENDING and HandlerType is not NULL then\r
      // no additional handlers will be processed and EFI_INTERRUPT_PENDING will be returned.\r
      //\r
      if (HandlerType != NULL) {\r
        return EFI_INTERRUPT_PENDING;\r
      }\r
      break;\r
\r
    case EFI_SUCCESS:\r
      //\r
      // If at least one of the handlers returns EFI_SUCCESS then the function will return\r
      // EFI_SUCCESS. If a handler returns EFI_SUCCESS and HandlerType is not NULL then no\r
      // additional handlers will be processed.\r
      //\r
      if (HandlerType != NULL) {\r
        return EFI_SUCCESS;\r
      }\r
      SuccessReturn = TRUE;\r
      break;\r
\r
    case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:\r
      //\r
      // If at least one of the handlers returns EFI_WARN_INTERRUPT_SOURCE_QUIESCED\r
      // then the function will return EFI_SUCCESS.\r
      //\r
      SuccessReturn = TRUE;\r
      break;\r
\r
    case EFI_WARN_INTERRUPT_SOURCE_PENDING:\r
      //\r
      // If all the handlers returned EFI_WARN_INTERRUPT_SOURCE_PENDING\r
      // then EFI_WARN_INTERRUPT_SOURCE_PENDING will be returned.\r
      //\r
      break;\r
\r
    default:\r
      //\r
      // Unexpected status code returned.\r
      //\r
      ASSERT (FALSE);\r
      break;\r
    }\r
  }\r
\r
  if (SuccessReturn) {\r
    Status = EFI_SUCCESS;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Registers a handler to execute within SMM.\r
\r
  @param  Handler        Handler service funtion pointer.\r
  @param  HandlerType    Points to the handler type or NULL for root SMI handlers.\r
  @param  DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.\r
\r
  @retval EFI_SUCCESS           Handler register success.\r
  @retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SmiHandlerRegister (\r
  IN  EFI_SMM_HANDLER_ENTRY_POINT2  Handler,\r
  IN  CONST EFI_GUID                *HandlerType  OPTIONAL,\r
  OUT EFI_HANDLE                    *DispatchHandle\r
  )\r
{\r
  SMI_HANDLER  *SmiHandler;\r
  SMI_ENTRY    *SmiEntry;\r
  LIST_ENTRY   *List;\r
\r
  if (Handler == NULL || DispatchHandle == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  SmiHandler = AllocateZeroPool (sizeof (SMI_HANDLER));\r
  if (SmiHandler == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  SmiHandler->Signature = SMI_HANDLER_SIGNATURE;\r
  SmiHandler->Handler = Handler;\r
  SmiHandler->CallerAddr = (UINTN)RETURN_ADDRESS (0);\r
\r
  if (HandlerType == NULL) {\r
    //\r
    // This is root SMI handler\r
    //\r
    SmiEntry = &mRootSmiEntry;\r
  } else {\r
    //\r
    // None root SMI handler\r
    //\r
    SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, TRUE);\r
    if (SmiEntry == NULL) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
  }\r
  List = &SmiEntry->SmiHandlers;\r
\r
  SmiHandler->SmiEntry = SmiEntry;\r
  InsertTailList (List, &SmiHandler->Link);\r
\r
  *DispatchHandle = (EFI_HANDLE) SmiHandler;\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Unregister a handler in SMM.\r
\r
  @param  DispatchHandle  The handle that was specified when the handler was registered.\r
\r
  @retval EFI_SUCCESS           Handler function was successfully unregistered.\r
  @retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
SmiHandlerUnRegister (\r
  IN EFI_HANDLE  DispatchHandle\r
  )\r
{\r
  SMI_HANDLER  *SmiHandler;\r
  SMI_ENTRY    *SmiEntry;\r
  LIST_ENTRY   *EntryLink;\r
  LIST_ENTRY   *HandlerLink;\r
\r
  if (DispatchHandle == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Look for it in root SMI handlers\r
  //\r
  SmiHandler = NULL;\r
  for ( HandlerLink = GetFirstNode (&mRootSmiEntry.SmiHandlers)\r
      ; !IsNull (&mRootSmiEntry.SmiHandlers, HandlerLink) && (SmiHandler != DispatchHandle)\r
      ; HandlerLink = GetNextNode (&mRootSmiEntry.SmiHandlers, HandlerLink)\r
      ) {\r
    SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
  }\r
\r
  //\r
  // Look for it in non-root SMI handlers\r
  //\r
  for ( EntryLink = GetFirstNode (&mSmiEntryList)\r
      ; !IsNull (&mSmiEntryList, EntryLink) && (SmiHandler != DispatchHandle)\r
      ; EntryLink = GetNextNode (&mSmiEntryList, EntryLink)\r
      ) {\r
    SmiEntry = CR (EntryLink, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r
    for ( HandlerLink = GetFirstNode (&SmiEntry->SmiHandlers)\r
        ; !IsNull (&SmiEntry->SmiHandlers, HandlerLink) && (SmiHandler != DispatchHandle)\r
        ; HandlerLink = GetNextNode (&SmiEntry->SmiHandlers, HandlerLink)\r
        ) {\r
      SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
    }\r
  }\r
\r
  if (SmiHandler != DispatchHandle) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  SmiEntry = SmiHandler->SmiEntry;\r
\r
  RemoveEntryList (&SmiHandler->Link);\r
  FreePool (SmiHandler);\r
\r
  if (SmiEntry == NULL) {\r
    //\r
    // This is root SMI handler\r
    //\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (IsListEmpty (&SmiEntry->SmiHandlers)) {\r
    //\r
    // No handler registered for this interrupt now, remove the SMI_ENTRY\r
    //\r
    RemoveEntryList (&SmiEntry->AllEntries);\r
\r
    FreePool (SmiEntry);\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
Commit	Line	Data
	1	/** @file\r
	2	SMI management.\r
	3	\r
	4	Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
	5	This program and the accompanying materials are licensed and made available\r
	6	under the terms and conditions of the BSD License which accompanies this\r
	7	distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#include "PiSmmCore.h"\r
	16	\r
	17	LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);\r
	18	\r
	19	SMI_ENTRY mRootSmiEntry = {\r
	20	SMI_ENTRY_SIGNATURE,\r
	21	INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.AllEntries),\r
	22	{0},\r
	23	INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiEntry.SmiHandlers),\r
	24	};\r
	25	\r
	26	/**\r
	27	Finds the SMI entry for the requested handler type.\r
	28	\r
	29	@param HandlerType The type of the interrupt\r
	30	@param Create Create a new entry if not found\r
	31	\r
	32	@return SMI entry\r
	33	\r
	34	**/\r
	35	SMI_ENTRY *\r
	36	EFIAPI\r
	37	SmmCoreFindSmiEntry (\r
	38	IN EFI_GUID *HandlerType,\r
	39	IN BOOLEAN Create\r
	40	)\r
	41	{\r
	42	LIST_ENTRY *Link;\r
	43	SMI_ENTRY *Item;\r
	44	SMI_ENTRY *SmiEntry;\r
	45	\r
	46	//\r
	47	// Search the SMI entry list for the matching GUID\r
	48	//\r
	49	SmiEntry = NULL;\r
	50	for (Link = mSmiEntryList.ForwardLink;\r
	51	Link != &mSmiEntryList;\r
	52	Link = Link->ForwardLink) {\r
	53	\r
	54	Item = CR (Link, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r
	55	if (CompareGuid (&Item->HandlerType, HandlerType)) {\r
	56	//\r
	57	// This is the SMI entry\r
	58	//\r
	59	SmiEntry = Item;\r
	60	break;\r
	61	}\r
	62	}\r
	63	\r
	64	//\r
	65	// If the protocol entry was not found and Create is TRUE, then\r
	66	// allocate a new entry\r
	67	//\r
	68	if ((SmiEntry == NULL) && Create) {\r
	69	SmiEntry = AllocatePool (sizeof(SMI_ENTRY));\r
	70	if (SmiEntry != NULL) {\r
	71	//\r
	72	// Initialize new SMI entry structure\r
	73	//\r
	74	SmiEntry->Signature = SMI_ENTRY_SIGNATURE;\r
	75	CopyGuid ((VOID *)&SmiEntry->HandlerType, HandlerType);\r
	76	InitializeListHead (&SmiEntry->SmiHandlers);\r
	77	\r
	78	//\r
	79	// Add it to SMI entry list\r
	80	//\r
	81	InsertTailList (&mSmiEntryList, &SmiEntry->AllEntries);\r
	82	}\r
	83	}\r
	84	return SmiEntry;\r
	85	}\r
	86	\r
	87	/**\r
	88	Manage SMI of a particular type.\r
	89	\r
	90	@param HandlerType Points to the handler type or NULL for root SMI handlers.\r
	91	@param Context Points to an optional context buffer.\r
	92	@param CommBuffer Points to the optional communication buffer.\r
	93	@param CommBufferSize Points to the size of the optional communication buffer.\r
	94	\r
	95	@retval EFI_WARN_INTERRUPT_SOURCE_PENDING Interrupt source was processed successfully but not quiesced.\r
	96	@retval EFI_INTERRUPT_PENDING One or more SMI sources could not be quiesced.\r
	97	@retval EFI_NOT_FOUND Interrupt source was not handled or quiesced.\r
	98	@retval EFI_SUCCESS Interrupt source was handled and quiesced.\r
	99	\r
	100	**/\r
	101	EFI_STATUS\r
	102	EFIAPI\r
	103	SmiManage (\r
	104	IN CONST EFI_GUID *HandlerType,\r
	105	IN CONST VOID *Context OPTIONAL,\r
	106	IN OUT VOID *CommBuffer OPTIONAL,\r
	107	IN OUT UINTN *CommBufferSize OPTIONAL\r
	108	)\r
	109	{\r
	110	LIST_ENTRY *Link;\r
	111	LIST_ENTRY *Head;\r
	112	SMI_ENTRY *SmiEntry;\r
	113	SMI_HANDLER *SmiHandler;\r
	114	BOOLEAN SuccessReturn;\r
	115	EFI_STATUS Status;\r
	116	\r
	117	Status = EFI_NOT_FOUND;\r
	118	SuccessReturn = FALSE;\r
	119	if (HandlerType == NULL) {\r
	120	//\r
	121	// Root SMI handler\r
	122	//\r
	123	SmiEntry = &mRootSmiEntry;\r
	124	} else {\r
	125	//\r
	126	// Non-root SMI handler\r
	127	//\r
	128	SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, FALSE);\r
	129	if (SmiEntry == NULL) {\r
	130	//\r
	131	// There is no handler registered for this interrupt source\r
	132	//\r
	133	return Status;\r
	134	}\r
	135	}\r
	136	Head = &SmiEntry->SmiHandlers;\r
	137	\r
	138	for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r
	139	SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
	140	\r
	141	Status = SmiHandler->Handler (\r
	142	(EFI_HANDLE) SmiHandler,\r
	143	Context,\r
	144	CommBuffer,\r
	145	CommBufferSize\r
	146	);\r
	147	\r
	148	switch (Status) {\r
	149	case EFI_INTERRUPT_PENDING:\r
	150	//\r
	151	// If a handler returns EFI_INTERRUPT_PENDING and HandlerType is not NULL then\r
	152	// no additional handlers will be processed and EFI_INTERRUPT_PENDING will be returned.\r
	153	//\r
	154	if (HandlerType != NULL) {\r
	155	return EFI_INTERRUPT_PENDING;\r
	156	}\r
	157	break;\r
	158	\r
	159	case EFI_SUCCESS:\r
	160	//\r
	161	// If at least one of the handlers returns EFI_SUCCESS then the function will return\r
	162	// EFI_SUCCESS. If a handler returns EFI_SUCCESS and HandlerType is not NULL then no\r
	163	// additional handlers will be processed.\r
	164	//\r
	165	if (HandlerType != NULL) {\r
	166	return EFI_SUCCESS;\r
	167	}\r
	168	SuccessReturn = TRUE;\r
	169	break;\r
	170	\r
	171	case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:\r
	172	//\r
	173	// If at least one of the handlers returns EFI_WARN_INTERRUPT_SOURCE_QUIESCED\r
	174	// then the function will return EFI_SUCCESS.\r
	175	//\r
	176	SuccessReturn = TRUE;\r
	177	break;\r
	178	\r
	179	case EFI_WARN_INTERRUPT_SOURCE_PENDING:\r
	180	//\r
	181	// If all the handlers returned EFI_WARN_INTERRUPT_SOURCE_PENDING\r
	182	// then EFI_WARN_INTERRUPT_SOURCE_PENDING will be returned.\r
	183	//\r
	184	break;\r
	185	\r
	186	default:\r
	187	//\r
	188	// Unexpected status code returned.\r
	189	//\r
	190	ASSERT (FALSE);\r
	191	break;\r
	192	}\r
	193	}\r
	194	\r
	195	if (SuccessReturn) {\r
	196	Status = EFI_SUCCESS;\r
	197	}\r
	198	\r
	199	return Status;\r
	200	}\r
	201	\r
	202	/**\r
	203	Registers a handler to execute within SMM.\r
	204	\r
	205	@param Handler Handler service funtion pointer.\r
	206	@param HandlerType Points to the handler type or NULL for root SMI handlers.\r
	207	@param DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.\r
	208	\r
	209	@retval EFI_SUCCESS Handler register success.\r
	210	@retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.\r
	211	\r
	212	**/\r
	213	EFI_STATUS\r
	214	EFIAPI\r
	215	SmiHandlerRegister (\r
	216	IN EFI_SMM_HANDLER_ENTRY_POINT2 Handler,\r
	217	IN CONST EFI_GUID *HandlerType OPTIONAL,\r
	218	OUT EFI_HANDLE *DispatchHandle\r
	219	)\r
	220	{\r
	221	SMI_HANDLER *SmiHandler;\r
	222	SMI_ENTRY *SmiEntry;\r
	223	LIST_ENTRY *List;\r
	224	\r
	225	if (Handler == NULL \|\| DispatchHandle == NULL) {\r
	226	return EFI_INVALID_PARAMETER;\r
	227	}\r
	228	\r
	229	SmiHandler = AllocateZeroPool (sizeof (SMI_HANDLER));\r
	230	if (SmiHandler == NULL) {\r
	231	return EFI_OUT_OF_RESOURCES;\r
	232	}\r
	233	\r
	234	SmiHandler->Signature = SMI_HANDLER_SIGNATURE;\r
	235	SmiHandler->Handler = Handler;\r
	236	SmiHandler->CallerAddr = (UINTN)RETURN_ADDRESS (0);\r
	237	\r
	238	if (HandlerType == NULL) {\r
	239	//\r
	240	// This is root SMI handler\r
	241	//\r
	242	SmiEntry = &mRootSmiEntry;\r
	243	} else {\r
	244	//\r
	245	// None root SMI handler\r
	246	//\r
	247	SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, TRUE);\r
	248	if (SmiEntry == NULL) {\r
	249	return EFI_OUT_OF_RESOURCES;\r
	250	}\r
	251	}\r
	252	List = &SmiEntry->SmiHandlers;\r
	253	\r
	254	SmiHandler->SmiEntry = SmiEntry;\r
	255	InsertTailList (List, &SmiHandler->Link);\r
	256	\r
	257	*DispatchHandle = (EFI_HANDLE) SmiHandler;\r
	258	\r
	259	return EFI_SUCCESS;\r
	260	}\r
	261	\r
	262	/**\r
	263	Unregister a handler in SMM.\r
	264	\r
	265	@param DispatchHandle The handle that was specified when the handler was registered.\r
	266	\r
	267	@retval EFI_SUCCESS Handler function was successfully unregistered.\r
	268	@retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.\r
	269	\r
	270	**/\r
	271	EFI_STATUS\r
	272	EFIAPI\r
	273	SmiHandlerUnRegister (\r
	274	IN EFI_HANDLE DispatchHandle\r
	275	)\r
	276	{\r
	277	SMI_HANDLER *SmiHandler;\r
	278	SMI_ENTRY *SmiEntry;\r
	279	LIST_ENTRY *EntryLink;\r
	280	LIST_ENTRY *HandlerLink;\r
	281	\r
	282	if (DispatchHandle == NULL) {\r
	283	return EFI_INVALID_PARAMETER;\r
	284	}\r
	285	\r
	286	//\r
	287	// Look for it in root SMI handlers\r
	288	//\r
	289	SmiHandler = NULL;\r
	290	for ( HandlerLink = GetFirstNode (&mRootSmiEntry.SmiHandlers)\r
	291	; !IsNull (&mRootSmiEntry.SmiHandlers, HandlerLink) && (SmiHandler != DispatchHandle)\r
	292	; HandlerLink = GetNextNode (&mRootSmiEntry.SmiHandlers, HandlerLink)\r
	293	) {\r
	294	SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
	295	}\r
	296	\r
	297	//\r
	298	// Look for it in non-root SMI handlers\r
	299	//\r
	300	for ( EntryLink = GetFirstNode (&mSmiEntryList)\r
	301	; !IsNull (&mSmiEntryList, EntryLink) && (SmiHandler != DispatchHandle)\r
	302	; EntryLink = GetNextNode (&mSmiEntryList, EntryLink)\r
	303	) {\r
	304	SmiEntry = CR (EntryLink, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r
	305	for ( HandlerLink = GetFirstNode (&SmiEntry->SmiHandlers)\r
	306	; !IsNull (&SmiEntry->SmiHandlers, HandlerLink) && (SmiHandler != DispatchHandle)\r
	307	; HandlerLink = GetNextNode (&SmiEntry->SmiHandlers, HandlerLink)\r
	308	) {\r
	309	SmiHandler = CR (HandlerLink, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
	310	}\r
	311	}\r
	312	\r
	313	if (SmiHandler != DispatchHandle) {\r
	314	return EFI_INVALID_PARAMETER;\r
	315	}\r
	316	\r
	317	SmiEntry = SmiHandler->SmiEntry;\r
	318	\r
	319	RemoveEntryList (&SmiHandler->Link);\r
	320	FreePool (SmiHandler);\r
	321	\r
	322	if (SmiEntry == NULL) {\r
	323	//\r
	324	// This is root SMI handler\r
	325	//\r
	326	return EFI_SUCCESS;\r
	327	}\r
	328	\r
	329	if (IsListEmpty (&SmiEntry->SmiHandlers)) {\r
	330	//\r
	331	// No handler registered for this interrupt now, remove the SMI_ENTRY\r
	332	//\r
	333	RemoveEntryList (&SmiEntry->AllEntries);\r
	334	\r
	335	FreePool (SmiEntry);\r
	336	}\r
	337	\r
	338	return EFI_SUCCESS;\r
	339	}\r