[mirror_edk2.git] / UefiCpuPkg / Library / CpuExceptionHandlerLib / PeiDxeSmmCpuException.c

/** @file\r
  CPU Exception Library provides PEI/DXE/SMM CPU common exception handler.\r
\r
Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials are licensed and made available under\r
the terms and conditions of the BSD License that accompanies this distribution.\r
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 "CpuExceptionCommon.h"\r
#include <Library/DebugLib.h>\r
\r
/**\r
  Internal worker function for common exception handler.\r
\r
  @param ExceptionType         Exception type.\r
  @param SystemContext         Pointer to EFI_SYSTEM_CONTEXT.\r
  @param ExceptionHandlerData  Pointer to exception handler data.\r
**/\r
VOID\r
CommonExceptionHandlerWorker (\r
  IN EFI_EXCEPTION_TYPE          ExceptionType, \r
  IN EFI_SYSTEM_CONTEXT          SystemContext,\r
  IN EXCEPTION_HANDLER_DATA      *ExceptionHandlerData\r
  )\r
{\r
  EXCEPTION_HANDLER_CONTEXT      *ExceptionHandlerContext;\r
  RESERVED_VECTORS_DATA          *ReservedVectors;\r
  EFI_CPU_INTERRUPT_HANDLER      *ExternalInterruptHandler;\r
\r
  ExceptionHandlerContext  = (EXCEPTION_HANDLER_CONTEXT *) (UINTN) (SystemContext.SystemContextIa32);\r
  ReservedVectors          = ExceptionHandlerData->ReservedVectors;\r
  ExternalInterruptHandler = ExceptionHandlerData->ExternalInterruptHandler;\r
\r
  switch (ReservedVectors[ExceptionType].Attribute) {\r
  case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
    //\r
    // Need to jmp to old IDT handler after this exception handler\r
    //\r
    ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
    ExceptionHandlerContext->OldIdtHandler     = ReservedVectors[ExceptionType].ExceptonHandler;\r
    break;\r
  case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
    while (TRUE) {\r
      //\r
      // If if anyone has gotten SPIN_LOCK for owner running hook after\r
      //\r
      if (AcquireSpinLockOrFail (&ReservedVectors[ExceptionType].SpinLock)) {\r
        //\r
        // Need to execute old IDT handler before running this exception handler\r
        //\r
        ReservedVectors[ExceptionType].ApicId = GetApicId ();\r
        ArchSaveExceptionContext (ExceptionType, SystemContext);\r
        ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
        ExceptionHandlerContext->OldIdtHandler     = ReservedVectors[ExceptionType].ExceptonHandler;\r
        return;\r
      }\r
      //\r
      // If failed to acquire SPIN_LOCK, check if it was locked by processor itself\r
      //\r
      if (ReservedVectors[ExceptionType].ApicId == GetApicId ()) {\r
        //\r
        // Old IDT handler has been executed, then retore CPU exception content to\r
        // run new exception handler.\r
        //\r
        ArchRestoreExceptionContext (ExceptionType, SystemContext);\r
        //\r
        // Rlease spin lock for ApicId\r
        //\r
        ReleaseSpinLock (&ReservedVectors[ExceptionType].SpinLock);\r
        break;\r
      }\r
      CpuPause ();\r
    }\r
    break;\r
  case 0xffffffff:\r
    break;\r
  default:\r
    //\r
    // It should never reach here\r
    //\r
    CpuDeadLoop ();\r
    break;\r
  }\r
  \r
  if (ExternalInterruptHandler != NULL &&\r
      ExternalInterruptHandler[ExceptionType] != NULL) {\r
    (ExternalInterruptHandler[ExceptionType]) (ExceptionType, SystemContext);\r
  } else if (ExceptionType < CPU_EXCEPTION_NUM) {\r
    //\r
    // Get Spinlock to display CPU information\r
    //\r
    while (!AcquireSpinLockOrFail (&ExceptionHandlerData->DisplayMessageSpinLock)) {\r
      CpuPause ();\r
    }\r
    //\r
    // Display ExceptionType, CPU information and Image information\r
    //  \r
    DumpCpuContent (ExceptionType, SystemContext);\r
    //\r
    // Release Spinlock of output message\r
    //\r
    ReleaseSpinLock (&ExceptionHandlerData->DisplayMessageSpinLock);\r
    //\r
    // Enter a dead loop if needn't to execute old IDT handler further\r
    //\r
    if (ReservedVectors[ExceptionType].Attribute != EFI_VECTOR_HANDOFF_HOOK_BEFORE) {\r
      CpuDeadLoop ();\r
    }\r
  }\r
}\r
\r
/**\r
  Internal worker function to update IDT entries accordling to vector attributes.\r
\r
  @param[in] IdtTable              Pointer to IDT table.\r
  @param[in] TemplateMap           Pointer to a buffer where the address map is\r
                                   returned.\r
  @param[in] ExceptionHandlerData  Pointer to exception handler data.\r
\r
**/\r
VOID\r
UpdateIdtTable (\r
  IN IA32_IDT_GATE_DESCRIPTOR        *IdtTable,\r
  IN EXCEPTION_HANDLER_TEMPLATE_MAP  *TemplateMap,\r
  IN EXCEPTION_HANDLER_DATA          *ExceptionHandlerData\r
  )\r
{\r
  UINT16                             CodeSegment;\r
  UINTN                              Index;\r
  UINTN                              InterruptHandler;\r
  RESERVED_VECTORS_DATA              *ReservedVectors;\r
\r
  ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
  //\r
  // Use current CS as the segment selector of interrupt gate in IDT\r
  //\r
  CodeSegment = AsmReadCs ();\r
\r
  for (Index = 0; Index < ExceptionHandlerData->IdtEntryCount; Index ++) {\r
    IdtTable[Index].Bits.Selector = CodeSegment;\r
    //\r
    // Check reserved vectors attributes\r
    //\r
    switch (ReservedVectors[Index].Attribute) {\r
    case EFI_VECTOR_HANDOFF_DO_NOT_HOOK:\r
      //\r
      // Keep original IDT entry\r
      //\r
      continue;\r
    case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
      InitializeSpinLock (&ReservedVectors[Index].SpinLock);\r
      CopyMem (\r
        (VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
        (VOID *) TemplateMap->HookAfterStubHeaderStart,\r
        TemplateMap->ExceptionStubHeaderSize\r
        );\r
      AsmVectorNumFixup (\r
        (VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
        (UINT8) Index,\r
        (VOID *) TemplateMap->HookAfterStubHeaderStart\r
        );\r
      //\r
      // Go on the following code\r
      //\r
    case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
      //\r
      // Save original IDT handler address\r
      //\r
      ReservedVectors[Index].ExceptonHandler = ArchGetIdtHandler (&IdtTable[Index]);\r
      //\r
      // Go on the following code\r
      //\r
    default:\r
      //\r
      // Update new IDT entry\r
      //\r
      InterruptHandler = TemplateMap->ExceptionStart + Index * TemplateMap->ExceptionStubHeaderSize;\r
      ArchUpdateIdtEntry (&IdtTable[Index], InterruptHandler);\r
      break;\r
    }\r
  }\r
}\r
\r
/**\r
  Internal worker function to initialize exception handler.\r
\r
  @param[in]      VectorInfo            Pointer to reserved vector list.\r
  @param[in, out] ExceptionHandlerData  Pointer to exception handler data.\r
  \r
  @retval EFI_SUCCESS           CPU Exception Entries have been successfully initialized \r
                                with default exception handlers.\r
  @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.\r
  @retval EFI_UNSUPPORTED       This function is not supported.\r
\r
**/\r
EFI_STATUS\r
InitializeCpuExceptionHandlersWorker (\r
  IN EFI_VECTOR_HANDOFF_INFO       *VectorInfo OPTIONAL,\r
  IN OUT EXCEPTION_HANDLER_DATA    *ExceptionHandlerData\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  IA32_DESCRIPTOR                  IdtDescriptor;\r
  UINTN                            IdtEntryCount;\r
  EXCEPTION_HANDLER_TEMPLATE_MAP   TemplateMap;\r
  IA32_IDT_GATE_DESCRIPTOR         *IdtTable;\r
  RESERVED_VECTORS_DATA            *ReservedVectors;\r
\r
  ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
  SetMem ((VOID *) ReservedVectors, sizeof (RESERVED_VECTORS_DATA) * CPU_EXCEPTION_NUM, 0xff);\r
  if (VectorInfo != NULL) {\r
    Status = ReadAndVerifyVectorInfo (VectorInfo, ReservedVectors, CPU_EXCEPTION_NUM);\r
    if (EFI_ERROR (Status)) {\r
      return EFI_INVALID_PARAMETER;\r
    }\r
  }\r
\r
  //\r
  // Read IDT descriptor and calculate IDT size\r
  //\r
  AsmReadIdtr (&IdtDescriptor);\r
  IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);\r
  if (IdtEntryCount > CPU_EXCEPTION_NUM) {\r
    //\r
    // CPU exeption library only setup CPU_EXCEPTION_NUM exception handler at most\r
    //\r
    IdtEntryCount = CPU_EXCEPTION_NUM;\r
  }\r
\r
  IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor.Base;\r
  AsmGetTemplateAddressMap (&TemplateMap);\r
  ASSERT (TemplateMap.ExceptionStubHeaderSize <= HOOKAFTER_STUB_SIZE);\r
\r
  ExceptionHandlerData->IdtEntryCount = IdtEntryCount;\r
  UpdateIdtTable (IdtTable, &TemplateMap, ExceptionHandlerData);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Registers a function to be called from the processor interrupt handler.\r
\r
  @param[in]  InterruptType        Defines which interrupt or exception to hook.\r
  @param[in]  InterruptHandler     A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called\r
                                   when a processor interrupt occurs. If this parameter is NULL, then the handler\r
                                   will be uninstalled\r
  @param[in] ExceptionHandlerData  Pointer to exception handler data.\r
\r
  @retval EFI_SUCCESS           The handler for the processor interrupt was successfully installed or uninstalled.\r
  @retval EFI_ALREADY_STARTED   InterruptHandler is not NULL, and a handler for InterruptType was\r
                                previously installed.\r
  @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not\r
                                previously installed.\r
  @retval EFI_UNSUPPORTED       The interrupt specified by InterruptType is not supported,\r
                                or this function is not supported.\r
**/\r
EFI_STATUS\r
RegisterCpuInterruptHandlerWorker (\r
  IN EFI_EXCEPTION_TYPE            InterruptType,\r
  IN EFI_CPU_INTERRUPT_HANDLER     InterruptHandler,\r
  IN EXCEPTION_HANDLER_DATA        *ExceptionHandlerData\r
  )\r
{\r
  UINTN                          EnabledInterruptNum;\r
  RESERVED_VECTORS_DATA          *ReservedVectors;\r
  EFI_CPU_INTERRUPT_HANDLER      *ExternalInterruptHandler;\r
\r
  EnabledInterruptNum      = ExceptionHandlerData->IdtEntryCount;\r
  ReservedVectors          = ExceptionHandlerData->ReservedVectors;\r
  ExternalInterruptHandler = ExceptionHandlerData->ExternalInterruptHandler;\r
\r
  if (InterruptType < 0 || InterruptType >= (EFI_EXCEPTION_TYPE)EnabledInterruptNum ||\r
      ReservedVectors[InterruptType].Attribute == EFI_VECTOR_HANDOFF_DO_NOT_HOOK) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  if (InterruptHandler == NULL && ExternalInterruptHandler[InterruptType] == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (InterruptHandler != NULL && ExternalInterruptHandler[InterruptType] != NULL) {\r
    return EFI_ALREADY_STARTED;\r
  }\r
\r
  ExternalInterruptHandler[InterruptType] = InterruptHandler;\r
  return EFI_SUCCESS;\r
}\r
\r
Commit	Line	Data
	1	/** @file\r
	2	CPU Exception Library provides PEI/DXE/SMM CPU common exception handler.\r
	3	\r
	4	Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>\r
	5	This program and the accompanying materials are licensed and made available under\r
	6	the terms and conditions of the BSD License that accompanies this distribution.\r
	7	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 "CpuExceptionCommon.h"\r
	16	#include <Library/DebugLib.h>\r
	17	\r
	18	/**\r
	19	Internal worker function for common exception handler.\r
	20	\r
	21	@param ExceptionType Exception type.\r
	22	@param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r
	23	@param ExceptionHandlerData Pointer to exception handler data.\r
	24	**/\r
	25	VOID\r
	26	CommonExceptionHandlerWorker (\r
	27	IN EFI_EXCEPTION_TYPE ExceptionType, \r
	28	IN EFI_SYSTEM_CONTEXT SystemContext,\r
	29	IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	30	)\r
	31	{\r
	32	EXCEPTION_HANDLER_CONTEXT *ExceptionHandlerContext;\r
	33	RESERVED_VECTORS_DATA *ReservedVectors;\r
	34	EFI_CPU_INTERRUPT_HANDLER *ExternalInterruptHandler;\r
	35	\r
	36	ExceptionHandlerContext = (EXCEPTION_HANDLER_CONTEXT *) (UINTN) (SystemContext.SystemContextIa32);\r
	37	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	38	ExternalInterruptHandler = ExceptionHandlerData->ExternalInterruptHandler;\r
	39	\r
	40	switch (ReservedVectors[ExceptionType].Attribute) {\r
	41	case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
	42	//\r
	43	// Need to jmp to old IDT handler after this exception handler\r
	44	//\r
	45	ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
	46	ExceptionHandlerContext->OldIdtHandler = ReservedVectors[ExceptionType].ExceptonHandler;\r
	47	break;\r
	48	case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
	49	while (TRUE) {\r
	50	//\r
	51	// If if anyone has gotten SPIN_LOCK for owner running hook after\r
	52	//\r
	53	if (AcquireSpinLockOrFail (&ReservedVectors[ExceptionType].SpinLock)) {\r
	54	//\r
	55	// Need to execute old IDT handler before running this exception handler\r
	56	//\r
	57	ReservedVectors[ExceptionType].ApicId = GetApicId ();\r
	58	ArchSaveExceptionContext (ExceptionType, SystemContext);\r
	59	ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
	60	ExceptionHandlerContext->OldIdtHandler = ReservedVectors[ExceptionType].ExceptonHandler;\r
	61	return;\r
	62	}\r
	63	//\r
	64	// If failed to acquire SPIN_LOCK, check if it was locked by processor itself\r
	65	//\r
	66	if (ReservedVectors[ExceptionType].ApicId == GetApicId ()) {\r
	67	//\r
	68	// Old IDT handler has been executed, then retore CPU exception content to\r
	69	// run new exception handler.\r
	70	//\r
	71	ArchRestoreExceptionContext (ExceptionType, SystemContext);\r
	72	//\r
	73	// Rlease spin lock for ApicId\r
	74	//\r
	75	ReleaseSpinLock (&ReservedVectors[ExceptionType].SpinLock);\r
	76	break;\r
	77	}\r
	78	CpuPause ();\r
	79	}\r
	80	break;\r
	81	case 0xffffffff:\r
	82	break;\r
	83	default:\r
	84	//\r
	85	// It should never reach here\r
	86	//\r
	87	CpuDeadLoop ();\r
	88	break;\r
	89	}\r
	90	\r
	91	if (ExternalInterruptHandler != NULL &&\r
	92	ExternalInterruptHandler[ExceptionType] != NULL) {\r
	93	(ExternalInterruptHandler[ExceptionType]) (ExceptionType, SystemContext);\r
	94	} else if (ExceptionType < CPU_EXCEPTION_NUM) {\r
	95	//\r
	96	// Get Spinlock to display CPU information\r
	97	//\r
	98	while (!AcquireSpinLockOrFail (&ExceptionHandlerData->DisplayMessageSpinLock)) {\r
	99	CpuPause ();\r
	100	}\r
	101	//\r
	102	// Display ExceptionType, CPU information and Image information\r
	103	// \r
	104	DumpCpuContent (ExceptionType, SystemContext);\r
	105	//\r
	106	// Release Spinlock of output message\r
	107	//\r
	108	ReleaseSpinLock (&ExceptionHandlerData->DisplayMessageSpinLock);\r
	109	//\r
	110	// Enter a dead loop if needn't to execute old IDT handler further\r
	111	//\r
	112	if (ReservedVectors[ExceptionType].Attribute != EFI_VECTOR_HANDOFF_HOOK_BEFORE) {\r
	113	CpuDeadLoop ();\r
	114	}\r
	115	}\r
	116	}\r
	117	\r
	118	/**\r
	119	Internal worker function to update IDT entries accordling to vector attributes.\r
	120	\r
	121	@param[in] IdtTable Pointer to IDT table.\r
	122	@param[in] TemplateMap Pointer to a buffer where the address map is\r
	123	returned.\r
	124	@param[in] ExceptionHandlerData Pointer to exception handler data.\r
	125	\r
	126	**/\r
	127	VOID\r
	128	UpdateIdtTable (\r
	129	IN IA32_IDT_GATE_DESCRIPTOR *IdtTable,\r
	130	IN EXCEPTION_HANDLER_TEMPLATE_MAP *TemplateMap,\r
	131	IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	132	)\r
	133	{\r
	134	UINT16 CodeSegment;\r
	135	UINTN Index;\r
	136	UINTN InterruptHandler;\r
	137	RESERVED_VECTORS_DATA *ReservedVectors;\r
	138	\r
	139	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	140	//\r
	141	// Use current CS as the segment selector of interrupt gate in IDT\r
	142	//\r
	143	CodeSegment = AsmReadCs ();\r
	144	\r
	145	for (Index = 0; Index < ExceptionHandlerData->IdtEntryCount; Index ++) {\r
	146	IdtTable[Index].Bits.Selector = CodeSegment;\r
	147	//\r
	148	// Check reserved vectors attributes\r
	149	//\r
	150	switch (ReservedVectors[Index].Attribute) {\r
	151	case EFI_VECTOR_HANDOFF_DO_NOT_HOOK:\r
	152	//\r
	153	// Keep original IDT entry\r
	154	//\r
	155	continue;\r
	156	case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
	157	InitializeSpinLock (&ReservedVectors[Index].SpinLock);\r
	158	CopyMem (\r
	159	(VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
	160	(VOID *) TemplateMap->HookAfterStubHeaderStart,\r
	161	TemplateMap->ExceptionStubHeaderSize\r
	162	);\r
	163	AsmVectorNumFixup (\r
	164	(VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
	165	(UINT8) Index,\r
	166	(VOID *) TemplateMap->HookAfterStubHeaderStart\r
	167	);\r
	168	//\r
	169	// Go on the following code\r
	170	//\r
	171	case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
	172	//\r
	173	// Save original IDT handler address\r
	174	//\r
	175	ReservedVectors[Index].ExceptonHandler = ArchGetIdtHandler (&IdtTable[Index]);\r
	176	//\r
	177	// Go on the following code\r
	178	//\r
	179	default:\r
	180	//\r
	181	// Update new IDT entry\r
	182	//\r
	183	InterruptHandler = TemplateMap->ExceptionStart + Index * TemplateMap->ExceptionStubHeaderSize;\r
	184	ArchUpdateIdtEntry (&IdtTable[Index], InterruptHandler);\r
	185	break;\r
	186	}\r
	187	}\r
	188	}\r
	189	\r
	190	/**\r
	191	Internal worker function to initialize exception handler.\r
	192	\r
	193	@param[in] VectorInfo Pointer to reserved vector list.\r
	194	@param[in, out] ExceptionHandlerData Pointer to exception handler data.\r
	195	\r
	196	@retval EFI_SUCCESS CPU Exception Entries have been successfully initialized \r
	197	with default exception handlers.\r
	198	@retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.\r
	199	@retval EFI_UNSUPPORTED This function is not supported.\r
	200	\r
	201	**/\r
	202	EFI_STATUS\r
	203	InitializeCpuExceptionHandlersWorker (\r
	204	IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL,\r
	205	IN OUT EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	206	)\r
	207	{\r
	208	EFI_STATUS Status;\r
	209	IA32_DESCRIPTOR IdtDescriptor;\r
	210	UINTN IdtEntryCount;\r
	211	EXCEPTION_HANDLER_TEMPLATE_MAP TemplateMap;\r
	212	IA32_IDT_GATE_DESCRIPTOR *IdtTable;\r
	213	RESERVED_VECTORS_DATA *ReservedVectors;\r
	214	\r
	215	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	216	SetMem ((VOID ) ReservedVectors, sizeof (RESERVED_VECTORS_DATA) CPU_EXCEPTION_NUM, 0xff);\r
	217	if (VectorInfo != NULL) {\r
	218	Status = ReadAndVerifyVectorInfo (VectorInfo, ReservedVectors, CPU_EXCEPTION_NUM);\r
	219	if (EFI_ERROR (Status)) {\r
	220	return EFI_INVALID_PARAMETER;\r
	221	}\r
	222	}\r
	223	\r
	224	//\r
	225	// Read IDT descriptor and calculate IDT size\r
	226	//\r
	227	AsmReadIdtr (&IdtDescriptor);\r
	228	IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);\r
	229	if (IdtEntryCount > CPU_EXCEPTION_NUM) {\r
	230	//\r
	231	// CPU exeption library only setup CPU_EXCEPTION_NUM exception handler at most\r
	232	//\r
	233	IdtEntryCount = CPU_EXCEPTION_NUM;\r
	234	}\r
	235	\r
	236	IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor.Base;\r
	237	AsmGetTemplateAddressMap (&TemplateMap);\r
	238	ASSERT (TemplateMap.ExceptionStubHeaderSize <= HOOKAFTER_STUB_SIZE);\r
	239	\r
	240	ExceptionHandlerData->IdtEntryCount = IdtEntryCount;\r
	241	UpdateIdtTable (IdtTable, &TemplateMap, ExceptionHandlerData);\r
	242	\r
	243	return EFI_SUCCESS;\r
	244	}\r
	245	\r
	246	/**\r
	247	Registers a function to be called from the processor interrupt handler.\r
	248	\r
	249	@param[in] InterruptType Defines which interrupt or exception to hook.\r
	250	@param[in] InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called\r
	251	when a processor interrupt occurs. If this parameter is NULL, then the handler\r
	252	will be uninstalled\r
	253	@param[in] ExceptionHandlerData Pointer to exception handler data.\r
	254	\r
	255	@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.\r
	256	@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was\r
	257	previously installed.\r
	258	@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not\r
	259	previously installed.\r
	260	@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported,\r
	261	or this function is not supported.\r
	262	**/\r
	263	EFI_STATUS\r
	264	RegisterCpuInterruptHandlerWorker (\r
	265	IN EFI_EXCEPTION_TYPE InterruptType,\r
	266	IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler,\r
	267	IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	268	)\r
	269	{\r
	270	UINTN EnabledInterruptNum;\r
	271	RESERVED_VECTORS_DATA *ReservedVectors;\r
	272	EFI_CPU_INTERRUPT_HANDLER *ExternalInterruptHandler;\r
	273	\r
	274	EnabledInterruptNum = ExceptionHandlerData->IdtEntryCount;\r
	275	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	276	ExternalInterruptHandler = ExceptionHandlerData->ExternalInterruptHandler;\r
	277	\r
	278	if (InterruptType < 0 \|\| InterruptType >= (EFI_EXCEPTION_TYPE)EnabledInterruptNum \|\|\r
	279	ReservedVectors[InterruptType].Attribute == EFI_VECTOR_HANDOFF_DO_NOT_HOOK) {\r
	280	return EFI_UNSUPPORTED;\r
	281	}\r
	282	\r
	283	if (InterruptHandler == NULL && ExternalInterruptHandler[InterruptType] == NULL) {\r
	284	return EFI_INVALID_PARAMETER;\r
	285	}\r
	286	\r
	287	if (InterruptHandler != NULL && ExternalInterruptHandler[InterruptType] != NULL) {\r
	288	return EFI_ALREADY_STARTED;\r
	289	}\r
	290	\r
	291	ExternalInterruptHandler[InterruptType] = InterruptHandler;\r
	292	return EFI_SUCCESS;\r
	293	}\r
	294	\r