[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
// Spinlock for CPU information display\r
//\r
SPIN_LOCK        mDisplayMessageSpinLock;\r
\r
//\r
// Image align size for DXE/SMM\r
//\r
CONST UINTN      mImageAlignSize = SIZE_4KB;\r
\r
RESERVED_VECTORS_DATA       mReservedVectorsData[CPU_EXCEPTION_NUM];\r
EFI_CPU_INTERRUPT_HANDLER   mExternalInterruptHandlerTable[CPU_EXCEPTION_NUM];\r
EFI_CPU_INTERRUPT_HANDLER   *mExternalInterruptHandler = NULL;\r
UINTN                       mEnabledInterruptNum = 0;\r
\r
/**\r
  Common exception handler.\r
\r
  @param ExceptionType  Exception type.\r
  @param SystemContext  Pointer to EFI_SYSTEM_CONTEXT.\r
**/\r
VOID\r
EFIAPI\r
CommonExceptionHandler (\r
  IN EFI_EXCEPTION_TYPE          ExceptionType, \r
  IN EFI_SYSTEM_CONTEXT          SystemContext\r
  )\r
{\r
  EXCEPTION_HANDLER_CONTEXT      *ExceptionHandlerContext;\r
\r
  ExceptionHandlerContext = (EXCEPTION_HANDLER_CONTEXT *) (UINTN) (SystemContext.SystemContextIa32);\r
\r
  switch (mReservedVectors[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     = mReservedVectors[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 (&mReservedVectors[ExceptionType].SpinLock)) {\r
        //\r
        // Need to execute old IDT handler before running this exception handler\r
        //\r
        mReservedVectors[ExceptionType].ApicId = GetApicId ();\r
        ArchSaveExceptionContext (ExceptionType, SystemContext);\r
        ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
        ExceptionHandlerContext->OldIdtHandler     = mReservedVectors[ExceptionType].ExceptonHandler;\r
        return;\r
      }\r
      //\r
      // If failed to acquire SPIN_LOCK, check if it was locked by processor itself\r
      //\r
      if (mReservedVectors[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 (&mReservedVectors[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 (mExternalInterruptHandler[ExceptionType] != NULL) {\r
    (mExternalInterruptHandler[ExceptionType]) (ExceptionType, SystemContext);\r
  } else if (ExceptionType < CPU_EXCEPTION_NUM) {\r
    //\r
    // Get Spinlock to display CPU information\r
    //\r
    while (!AcquireSpinLockOrFail (&mDisplayMessageSpinLock)) {\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 (&mDisplayMessageSpinLock);\r
    //\r
    // Enter a dead loop if needn't to execute old IDT handler further\r
    //\r
    if (mReservedVectors[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
  // Save Interrupt number to global variable used for RegisterCpuInterruptHandler ()\r
  //\r
  mEnabledInterruptNum = ExceptionHandlerData->IdtEntryCount;\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
  InitializeSpinLock (&mDisplayMessageSpinLock);\r
\r
  mExternalInterruptHandler = mExternalInterruptHandlerTable;\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
  mEnabledInterruptNum = IdtEntryCount;\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
\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
  )\r
{\r
  if (InterruptType < 0 || InterruptType >= (EFI_EXCEPTION_TYPE)mEnabledInterruptNum ||\r
      mReservedVectors[InterruptType].Attribute == EFI_VECTOR_HANDOFF_DO_NOT_HOOK) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  if (InterruptHandler == NULL && mExternalInterruptHandler[InterruptType] == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (InterruptHandler != NULL && mExternalInterruptHandler[InterruptType] != NULL) {\r
    return EFI_ALREADY_STARTED;\r
  }\r
\r
  mExternalInterruptHandler[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	// Spinlock for CPU information display\r
	20	//\r
	21	SPIN_LOCK mDisplayMessageSpinLock;\r
	22	\r
	23	//\r
	24	// Image align size for DXE/SMM\r
	25	//\r
	26	CONST UINTN mImageAlignSize = SIZE_4KB;\r
	27	\r
	28	RESERVED_VECTORS_DATA mReservedVectorsData[CPU_EXCEPTION_NUM];\r
	29	EFI_CPU_INTERRUPT_HANDLER mExternalInterruptHandlerTable[CPU_EXCEPTION_NUM];\r
	30	EFI_CPU_INTERRUPT_HANDLER *mExternalInterruptHandler = NULL;\r
	31	UINTN mEnabledInterruptNum = 0;\r
	32	\r
	33	/**\r
	34	Common exception handler.\r
	35	\r
	36	@param ExceptionType Exception type.\r
	37	@param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r
	38	**/\r
	39	VOID\r
	40	EFIAPI\r
	41	CommonExceptionHandler (\r
	42	IN EFI_EXCEPTION_TYPE ExceptionType, \r
	43	IN EFI_SYSTEM_CONTEXT SystemContext\r
	44	)\r
	45	{\r
	46	EXCEPTION_HANDLER_CONTEXT *ExceptionHandlerContext;\r
	47	\r
	48	ExceptionHandlerContext = (EXCEPTION_HANDLER_CONTEXT *) (UINTN) (SystemContext.SystemContextIa32);\r
	49	\r
	50	switch (mReservedVectors[ExceptionType].Attribute) {\r
	51	case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
	52	//\r
	53	// Need to jmp to old IDT handler after this exception handler\r
	54	//\r
	55	ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
	56	ExceptionHandlerContext->OldIdtHandler = mReservedVectors[ExceptionType].ExceptonHandler;\r
	57	break;\r
	58	case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
	59	while (TRUE) {\r
	60	//\r
	61	// If if anyone has gotten SPIN_LOCK for owner running hook after\r
	62	//\r
	63	if (AcquireSpinLockOrFail (&mReservedVectors[ExceptionType].SpinLock)) {\r
	64	//\r
	65	// Need to execute old IDT handler before running this exception handler\r
	66	//\r
	67	mReservedVectors[ExceptionType].ApicId = GetApicId ();\r
	68	ArchSaveExceptionContext (ExceptionType, SystemContext);\r
	69	ExceptionHandlerContext->ExceptionDataFlag = (mErrorCodeFlag & (1 << ExceptionType)) ? TRUE : FALSE;\r
	70	ExceptionHandlerContext->OldIdtHandler = mReservedVectors[ExceptionType].ExceptonHandler;\r
	71	return;\r
	72	}\r
	73	//\r
	74	// If failed to acquire SPIN_LOCK, check if it was locked by processor itself\r
	75	//\r
	76	if (mReservedVectors[ExceptionType].ApicId == GetApicId ()) {\r
	77	//\r
	78	// Old IDT handler has been executed, then retore CPU exception content to\r
	79	// run new exception handler.\r
	80	//\r
	81	ArchRestoreExceptionContext (ExceptionType, SystemContext);\r
	82	//\r
	83	// Rlease spin lock for ApicId\r
	84	//\r
	85	ReleaseSpinLock (&mReservedVectors[ExceptionType].SpinLock);\r
	86	break;\r
	87	}\r
	88	CpuPause ();\r
	89	}\r
	90	break;\r
	91	case 0xffffffff:\r
	92	break;\r
	93	default:\r
	94	//\r
	95	// It should never reach here\r
	96	//\r
	97	CpuDeadLoop ();\r
	98	break;\r
	99	}\r
	100	\r
	101	if (mExternalInterruptHandler[ExceptionType] != NULL) {\r
	102	(mExternalInterruptHandler[ExceptionType]) (ExceptionType, SystemContext);\r
	103	} else if (ExceptionType < CPU_EXCEPTION_NUM) {\r
	104	//\r
	105	// Get Spinlock to display CPU information\r
	106	//\r
	107	while (!AcquireSpinLockOrFail (&mDisplayMessageSpinLock)) {\r
	108	CpuPause ();\r
	109	}\r
	110	//\r
	111	// Display ExceptionType, CPU information and Image information\r
	112	// \r
	113	DumpCpuContent (ExceptionType, SystemContext);\r
	114	//\r
	115	// Release Spinlock of output message\r
	116	//\r
	117	ReleaseSpinLock (&mDisplayMessageSpinLock);\r
	118	//\r
	119	// Enter a dead loop if needn't to execute old IDT handler further\r
	120	//\r
	121	if (mReservedVectors[ExceptionType].Attribute != EFI_VECTOR_HANDOFF_HOOK_BEFORE) {\r
	122	CpuDeadLoop ();\r
	123	}\r
	124	}\r
	125	}\r
	126	\r
	127	/**\r
	128	Internal worker function to update IDT entries accordling to vector attributes.\r
	129	\r
	130	@param[in] IdtTable Pointer to IDT table.\r
	131	@param[in] TemplateMap Pointer to a buffer where the address map is\r
	132	returned.\r
	133	@param[in] ExceptionHandlerData Pointer to exception handler data.\r
	134	\r
	135	**/\r
	136	VOID\r
	137	UpdateIdtTable (\r
	138	IN IA32_IDT_GATE_DESCRIPTOR *IdtTable,\r
	139	IN EXCEPTION_HANDLER_TEMPLATE_MAP *TemplateMap,\r
	140	IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	141	)\r
	142	{\r
	143	UINT16 CodeSegment;\r
	144	UINTN Index;\r
	145	UINTN InterruptHandler;\r
	146	RESERVED_VECTORS_DATA *ReservedVectors;\r
	147	\r
	148	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	149	//\r
	150	// Use current CS as the segment selector of interrupt gate in IDT\r
	151	//\r
	152	CodeSegment = AsmReadCs ();\r
	153	\r
	154	for (Index = 0; Index < ExceptionHandlerData->IdtEntryCount; Index ++) {\r
	155	IdtTable[Index].Bits.Selector = CodeSegment;\r
	156	//\r
	157	// Check reserved vectors attributes\r
	158	//\r
	159	switch (ReservedVectors[Index].Attribute) {\r
	160	case EFI_VECTOR_HANDOFF_DO_NOT_HOOK:\r
	161	//\r
	162	// Keep original IDT entry\r
	163	//\r
	164	continue;\r
	165	case EFI_VECTOR_HANDOFF_HOOK_AFTER:\r
	166	InitializeSpinLock (&ReservedVectors[Index].SpinLock);\r
	167	CopyMem (\r
	168	(VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
	169	(VOID *) TemplateMap->HookAfterStubHeaderStart,\r
	170	TemplateMap->ExceptionStubHeaderSize\r
	171	);\r
	172	AsmVectorNumFixup (\r
	173	(VOID *) ReservedVectors[Index].HookAfterStubHeaderCode,\r
	174	(UINT8) Index,\r
	175	(VOID *) TemplateMap->HookAfterStubHeaderStart\r
	176	);\r
	177	//\r
	178	// Go on the following code\r
	179	//\r
	180	case EFI_VECTOR_HANDOFF_HOOK_BEFORE:\r
	181	//\r
	182	// Save original IDT handler address\r
	183	//\r
	184	ReservedVectors[Index].ExceptonHandler = ArchGetIdtHandler (&IdtTable[Index]);\r
	185	//\r
	186	// Go on the following code\r
	187	//\r
	188	default:\r
	189	//\r
	190	// Update new IDT entry\r
	191	//\r
	192	InterruptHandler = TemplateMap->ExceptionStart + Index * TemplateMap->ExceptionStubHeaderSize;\r
	193	ArchUpdateIdtEntry (&IdtTable[Index], InterruptHandler);\r
	194	break;\r
	195	}\r
	196	}\r
	197	\r
	198	//\r
	199	// Save Interrupt number to global variable used for RegisterCpuInterruptHandler ()\r
	200	//\r
	201	mEnabledInterruptNum = ExceptionHandlerData->IdtEntryCount;\r
	202	}\r
	203	\r
	204	/**\r
	205	Internal worker function to initialize exception handler.\r
	206	\r
	207	@param[in] VectorInfo Pointer to reserved vector list.\r
	208	@param[in, out] ExceptionHandlerData Pointer to exception handler data.\r
	209	\r
	210	@retval EFI_SUCCESS CPU Exception Entries have been successfully initialized \r
	211	with default exception handlers.\r
	212	@retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.\r
	213	@retval EFI_UNSUPPORTED This function is not supported.\r
	214	\r
	215	**/\r
	216	EFI_STATUS\r
	217	InitializeCpuExceptionHandlersWorker (\r
	218	IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL,\r
	219	IN OUT EXCEPTION_HANDLER_DATA *ExceptionHandlerData\r
	220	)\r
	221	{\r
	222	EFI_STATUS Status;\r
	223	IA32_DESCRIPTOR IdtDescriptor;\r
	224	UINTN IdtEntryCount;\r
	225	EXCEPTION_HANDLER_TEMPLATE_MAP TemplateMap;\r
	226	IA32_IDT_GATE_DESCRIPTOR *IdtTable;\r
	227	RESERVED_VECTORS_DATA *ReservedVectors;\r
	228	\r
	229	ReservedVectors = ExceptionHandlerData->ReservedVectors;\r
	230	SetMem ((VOID ) ReservedVectors, sizeof (RESERVED_VECTORS_DATA) CPU_EXCEPTION_NUM, 0xff);\r
	231	if (VectorInfo != NULL) {\r
	232	Status = ReadAndVerifyVectorInfo (VectorInfo, ReservedVectors, CPU_EXCEPTION_NUM);\r
	233	if (EFI_ERROR (Status)) {\r
	234	return EFI_INVALID_PARAMETER;\r
	235	}\r
	236	}\r
	237	InitializeSpinLock (&mDisplayMessageSpinLock);\r
	238	\r
	239	mExternalInterruptHandler = mExternalInterruptHandlerTable;\r
	240	//\r
	241	// Read IDT descriptor and calculate IDT size\r
	242	//\r
	243	AsmReadIdtr (&IdtDescriptor);\r
	244	IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);\r
	245	if (IdtEntryCount > CPU_EXCEPTION_NUM) {\r
	246	//\r
	247	// CPU exeption library only setup CPU_EXCEPTION_NUM exception handler at most\r
	248	//\r
	249	IdtEntryCount = CPU_EXCEPTION_NUM;\r
	250	}\r
	251	\r
	252	IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor.Base;\r
	253	AsmGetTemplateAddressMap (&TemplateMap);\r
	254	ASSERT (TemplateMap.ExceptionStubHeaderSize <= HOOKAFTER_STUB_SIZE);\r
	255	\r
	256	ExceptionHandlerData->IdtEntryCount = IdtEntryCount;\r
	257	UpdateIdtTable (IdtTable, &TemplateMap, ExceptionHandlerData);\r
	258	mEnabledInterruptNum = IdtEntryCount;\r
	259	return EFI_SUCCESS;\r
	260	}\r
	261	\r
	262	/**\r
	263	Registers a function to be called from the processor interrupt handler.\r
	264	\r
	265	@param[in] InterruptType Defines which interrupt or exception to hook.\r
	266	@param[in] InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called\r
	267	when a processor interrupt occurs. If this parameter is NULL, then the handler\r
	268	will be uninstalled.\r
	269	\r
	270	@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.\r
	271	@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was\r
	272	previously installed.\r
	273	@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not\r
	274	previously installed.\r
	275	@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported,\r
	276	or this function is not supported.\r
	277	**/\r
	278	EFI_STATUS\r
	279	RegisterCpuInterruptHandlerWorker (\r
	280	IN EFI_EXCEPTION_TYPE InterruptType,\r
	281	IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler\r
	282	)\r
	283	{\r
	284	if (InterruptType < 0 \|\| InterruptType >= (EFI_EXCEPTION_TYPE)mEnabledInterruptNum \|\|\r
	285	mReservedVectors[InterruptType].Attribute == EFI_VECTOR_HANDOFF_DO_NOT_HOOK) {\r
	286	return EFI_UNSUPPORTED;\r
	287	}\r
	288	\r
	289	if (InterruptHandler == NULL && mExternalInterruptHandler[InterruptType] == NULL) {\r
	290	return EFI_INVALID_PARAMETER;\r
	291	}\r
	292	\r
	293	if (InterruptHandler != NULL && mExternalInterruptHandler[InterruptType] != NULL) {\r
	294	return EFI_ALREADY_STARTED;\r
	295	}\r
	296	\r
	297	mExternalInterruptHandler[InterruptType] = InterruptHandler;\r
	298	return EFI_SUCCESS;\r
	299	}\r
	300	\r