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

/** @file\r
  SMI management.\r
\r
  Copyright (c) 2009 - 2012, 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
//\r
// SMM_HANDLER - used for each SMM handler\r
//\r
\r
#define SMI_ENTRY_SIGNATURE  SIGNATURE_32('s','m','i','e')\r
\r
 typedef struct {\r
  UINTN       Signature;\r
  LIST_ENTRY  AllEntries;  // All entries\r
\r
  EFI_GUID    HandlerType; // Type of interrupt\r
  LIST_ENTRY  SmiHandlers; // All handlers\r
} SMI_ENTRY;\r
\r
#define SMI_HANDLER_SIGNATURE  SIGNATURE_32('s','m','i','h')\r
\r
 typedef struct {\r
  UINTN                         Signature;\r
  LIST_ENTRY                    Link;        // Link on SMI_ENTRY.SmiHandlers\r
  EFI_SMM_HANDLER_ENTRY_POINT2  Handler;     // The smm handler's entry point\r
  SMI_ENTRY                     *SmiEntry;\r
} SMI_HANDLER;\r
\r
LIST_ENTRY  mRootSmiHandlerList = INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiHandlerList);\r
LIST_ENTRY  mSmiEntryList       = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);\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      InterruptQuiesced;\r
  EFI_STATUS   Status;\r
  \r
  Status = EFI_NOT_FOUND;\r
  InterruptQuiesced = FALSE;\r
  if (HandlerType == NULL) {\r
    //\r
    // Root SMI handler\r
    //\r
\r
    Head = &mRootSmiHandlerList;\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
\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 then no additional handlers \r
      // 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 a handler returns EFI_SUCCESS then no additional handlers will be processed.\r
      // then the function will return EFI_SUCCESS.\r
      //\r
      if (HandlerType != NULL) {\r
        return EFI_SUCCESS;\r
      }\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
      InterruptQuiesced = 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 (InterruptQuiesced) {\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
\r
  if (HandlerType == NULL) {\r
    //\r
    // This is root SMI handler\r
    //\r
    SmiEntry = NULL;\r
    List = &mRootSmiHandlerList;\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
\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
\r
  SmiHandler = (SMI_HANDLER *) DispatchHandle;\r
\r
  if (SmiHandler == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (SmiHandler->Signature != SMI_HANDLER_SIGNATURE) {\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 - 2012, 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	//\r
	18	// SMM_HANDLER - used for each SMM handler\r
	19	//\r
	20	\r
	21	#define SMI_ENTRY_SIGNATURE SIGNATURE_32('s','m','i','e')\r
	22	\r
	23	typedef struct {\r
	24	UINTN Signature;\r
	25	LIST_ENTRY AllEntries; // All entries\r
	26	\r
	27	EFI_GUID HandlerType; // Type of interrupt\r
	28	LIST_ENTRY SmiHandlers; // All handlers\r
	29	} SMI_ENTRY;\r
	30	\r
	31	#define SMI_HANDLER_SIGNATURE SIGNATURE_32('s','m','i','h')\r
	32	\r
	33	typedef struct {\r
	34	UINTN Signature;\r
	35	LIST_ENTRY Link; // Link on SMI_ENTRY.SmiHandlers\r
	36	EFI_SMM_HANDLER_ENTRY_POINT2 Handler; // The smm handler's entry point\r
	37	SMI_ENTRY *SmiEntry;\r
	38	} SMI_HANDLER;\r
	39	\r
	40	LIST_ENTRY mRootSmiHandlerList = INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiHandlerList);\r
	41	LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);\r
	42	\r
	43	/**\r
	44	Finds the SMI entry for the requested handler type.\r
	45	\r
	46	@param HandlerType The type of the interrupt\r
	47	@param Create Create a new entry if not found\r
	48	\r
	49	@return SMI entry\r
	50	\r
	51	**/\r
	52	SMI_ENTRY *\r
	53	EFIAPI\r
	54	SmmCoreFindSmiEntry (\r
	55	IN EFI_GUID *HandlerType,\r
	56	IN BOOLEAN Create\r
	57	)\r
	58	{\r
	59	LIST_ENTRY *Link;\r
	60	SMI_ENTRY *Item;\r
	61	SMI_ENTRY *SmiEntry;\r
	62	\r
	63	//\r
	64	// Search the SMI entry list for the matching GUID\r
	65	//\r
	66	SmiEntry = NULL;\r
	67	for (Link = mSmiEntryList.ForwardLink;\r
	68	Link != &mSmiEntryList;\r
	69	Link = Link->ForwardLink) {\r
	70	\r
	71	Item = CR (Link, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);\r
	72	if (CompareGuid (&Item->HandlerType, HandlerType)) {\r
	73	//\r
	74	// This is the SMI entry\r
	75	//\r
	76	SmiEntry = Item;\r
	77	break;\r
	78	}\r
	79	}\r
	80	\r
	81	//\r
	82	// If the protocol entry was not found and Create is TRUE, then\r
	83	// allocate a new entry\r
	84	//\r
	85	if ((SmiEntry == NULL) && Create) {\r
	86	SmiEntry = AllocatePool (sizeof(SMI_ENTRY));\r
	87	if (SmiEntry != NULL) {\r
	88	//\r
	89	// Initialize new SMI entry structure\r
	90	//\r
	91	SmiEntry->Signature = SMI_ENTRY_SIGNATURE;\r
	92	CopyGuid ((VOID *)&SmiEntry->HandlerType, HandlerType);\r
	93	InitializeListHead (&SmiEntry->SmiHandlers);\r
	94	\r
	95	//\r
	96	// Add it to SMI entry list\r
	97	//\r
	98	InsertTailList (&mSmiEntryList, &SmiEntry->AllEntries);\r
	99	}\r
	100	}\r
	101	return SmiEntry;\r
	102	}\r
	103	\r
	104	/**\r
	105	Manage SMI of a particular type.\r
	106	\r
	107	@param HandlerType Points to the handler type or NULL for root SMI handlers.\r
	108	@param Context Points to an optional context buffer.\r
	109	@param CommBuffer Points to the optional communication buffer.\r
	110	@param CommBufferSize Points to the size of the optional communication buffer.\r
	111	\r
	112	@retval EFI_WARN_INTERRUPT_SOURCE_PENDING Interrupt source was processed successfully but not quiesced.\r
	113	@retval EFI_INTERRUPT_PENDING One or more SMI sources could not be quiesced.\r
	114	@retval EFI_NOT_FOUND Interrupt source was not handled or quiesced.\r
	115	@retval EFI_SUCCESS Interrupt source was handled and quiesced.\r
	116	\r
	117	**/\r
	118	EFI_STATUS\r
	119	EFIAPI\r
	120	SmiManage (\r
	121	IN CONST EFI_GUID *HandlerType,\r
	122	IN CONST VOID *Context OPTIONAL,\r
	123	IN OUT VOID *CommBuffer OPTIONAL,\r
	124	IN OUT UINTN *CommBufferSize OPTIONAL\r
	125	)\r
	126	{\r
	127	LIST_ENTRY *Link;\r
	128	LIST_ENTRY *Head;\r
	129	SMI_ENTRY *SmiEntry;\r
	130	SMI_HANDLER *SmiHandler;\r
	131	BOOLEAN InterruptQuiesced;\r
	132	EFI_STATUS Status;\r
	133	\r
	134	Status = EFI_NOT_FOUND;\r
	135	InterruptQuiesced = FALSE;\r
	136	if (HandlerType == NULL) {\r
	137	//\r
	138	// Root SMI handler\r
	139	//\r
	140	\r
	141	Head = &mRootSmiHandlerList;\r
	142	} else {\r
	143	//\r
	144	// Non-root SMI handler\r
	145	//\r
	146	SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, FALSE);\r
	147	if (SmiEntry == NULL) {\r
	148	//\r
	149	// There is no handler registered for this interrupt source\r
	150	//\r
	151	return Status;\r
	152	}\r
	153	\r
	154	Head = &SmiEntry->SmiHandlers;\r
	155	}\r
	156	\r
	157	for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {\r
	158	SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);\r
	159	\r
	160	Status = SmiHandler->Handler (\r
	161	(EFI_HANDLE) SmiHandler,\r
	162	Context,\r
	163	CommBuffer,\r
	164	CommBufferSize\r
	165	);\r
	166	\r
	167	switch (Status) {\r
	168	case EFI_INTERRUPT_PENDING:\r
	169	//\r
	170	// If a handler returns EFI_INTERRUPT_PENDING then no additional handlers \r
	171	// will be processed and EFI_INTERRUPT_PENDING will be returned.\r
	172	//\r
	173	if (HandlerType != NULL) {\r
	174	return EFI_INTERRUPT_PENDING;\r
	175	}\r
	176	break;\r
	177	\r
	178	case EFI_SUCCESS:\r
	179	//\r
	180	// If a handler returns EFI_SUCCESS then no additional handlers will be processed.\r
	181	// then the function will return EFI_SUCCESS.\r
	182	//\r
	183	if (HandlerType != NULL) {\r
	184	return EFI_SUCCESS;\r
	185	}\r
	186	break;\r
	187	\r
	188	case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:\r
	189	//\r
	190	// If at least one of the handlers returns EFI_WARN_INTERRUPT_SOURCE_QUIESCED\r
	191	// then the function will return EFI_SUCCESS. \r
	192	//\r
	193	InterruptQuiesced = TRUE;\r
	194	break;\r
	195	\r
	196	case EFI_WARN_INTERRUPT_SOURCE_PENDING:\r
	197	//\r
	198	// If all the handlers returned EFI_WARN_INTERRUPT_SOURCE_PENDING\r
	199	// then EFI_WARN_INTERRUPT_SOURCE_PENDING will be returned.\r
	200	//\r
	201	break;\r
	202	\r
	203	default:\r
	204	//\r
	205	// Unexpected status code returned.\r
	206	//\r
	207	ASSERT (FALSE);\r
	208	break;\r
	209	}\r
	210	}\r
	211	\r
	212	if (InterruptQuiesced) {\r
	213	Status = EFI_SUCCESS;\r
	214	}\r
	215	\r
	216	return Status;\r
	217	}\r
	218	\r
	219	/**\r
	220	Registers a handler to execute within SMM.\r
	221	\r
	222	@param Handler Handler service funtion pointer.\r
	223	@param HandlerType Points to the handler type or NULL for root SMI handlers.\r
	224	@param DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.\r
	225	\r
	226	@retval EFI_SUCCESS Handler register success.\r
	227	@retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.\r
	228	\r
	229	**/\r
	230	EFI_STATUS\r
	231	EFIAPI\r
	232	SmiHandlerRegister (\r
	233	IN EFI_SMM_HANDLER_ENTRY_POINT2 Handler,\r
	234	IN CONST EFI_GUID *HandlerType OPTIONAL,\r
	235	OUT EFI_HANDLE *DispatchHandle\r
	236	)\r
	237	{\r
	238	SMI_HANDLER *SmiHandler;\r
	239	SMI_ENTRY *SmiEntry;\r
	240	LIST_ENTRY *List;\r
	241	\r
	242	if (Handler == NULL \|\| DispatchHandle == NULL) {\r
	243	return EFI_INVALID_PARAMETER;\r
	244	}\r
	245	\r
	246	SmiHandler = AllocateZeroPool (sizeof (SMI_HANDLER));\r
	247	if (SmiHandler == NULL) {\r
	248	return EFI_OUT_OF_RESOURCES;\r
	249	}\r
	250	\r
	251	SmiHandler->Signature = SMI_HANDLER_SIGNATURE;\r
	252	SmiHandler->Handler = Handler;\r
	253	\r
	254	if (HandlerType == NULL) {\r
	255	//\r
	256	// This is root SMI handler\r
	257	//\r
	258	SmiEntry = NULL;\r
	259	List = &mRootSmiHandlerList;\r
	260	} else {\r
	261	//\r
	262	// None root SMI handler\r
	263	//\r
	264	SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, TRUE);\r
	265	if (SmiEntry == NULL) {\r
	266	return EFI_OUT_OF_RESOURCES;\r
	267	}\r
	268	\r
	269	List = &SmiEntry->SmiHandlers;\r
	270	}\r
	271	\r
	272	SmiHandler->SmiEntry = SmiEntry;\r
	273	InsertTailList (List, &SmiHandler->Link);\r
	274	\r
	275	*DispatchHandle = (EFI_HANDLE) SmiHandler;\r
	276	\r
	277	return EFI_SUCCESS;\r
	278	}\r
	279	\r
	280	/**\r
	281	Unregister a handler in SMM.\r
	282	\r
	283	@param DispatchHandle The handle that was specified when the handler was registered.\r
	284	\r
	285	@retval EFI_SUCCESS Handler function was successfully unregistered.\r
	286	@retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.\r
	287	\r
	288	**/\r
	289	EFI_STATUS\r
	290	EFIAPI\r
	291	SmiHandlerUnRegister (\r
	292	IN EFI_HANDLE DispatchHandle\r
	293	)\r
	294	{\r
	295	SMI_HANDLER *SmiHandler;\r
	296	SMI_ENTRY *SmiEntry;\r
	297	\r
	298	SmiHandler = (SMI_HANDLER *) DispatchHandle;\r
	299	\r
	300	if (SmiHandler == NULL) {\r
	301	return EFI_INVALID_PARAMETER;\r
	302	}\r
	303	\r
	304	if (SmiHandler->Signature != SMI_HANDLER_SIGNATURE) {\r
	305	return EFI_INVALID_PARAMETER;\r
	306	}\r
	307	\r
	308	SmiEntry = SmiHandler->SmiEntry;\r
	309	\r
	310	RemoveEntryList (&SmiHandler->Link);\r
	311	FreePool (SmiHandler);\r
	312	\r
	313	if (SmiEntry == NULL) {\r
	314	//\r
	315	// This is root SMI handler\r
	316	//\r
	317	return EFI_SUCCESS;\r
	318	}\r
	319	\r
	320	if (IsListEmpty (&SmiEntry->SmiHandlers)) {\r
	321	//\r
	322	// No handler registered for this interrupt now, remove the SMI_ENTRY\r
	323	//\r
	324	RemoveEntryList (&SmiEntry->AllEntries);\r
	325	\r
	326	FreePool (SmiEntry);\r
	327	}\r
	328	\r
	329	return EFI_SUCCESS;\r
	330	}\r