UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c

   1 /** @file
   2   CPU exception handler library implemenation for DXE modules.
   3
   4   Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <PiDxe.h>
  16 #include "CpuExceptionCommon.h"
  17 #include <Library/DebugLib.h>
  18 #include <Library/MemoryAllocationLib.h>
  19
  20 CONST UINTN    mDoFarReturnFlag  = 0;
  21
  22 extern SPIN_LOCK                   mDisplayMessageSpinLock;
  23 extern EFI_CPU_INTERRUPT_HANDLER   *mExternalInterruptHandler;
  24 extern RESERVED_VECTORS_DATA       mReservedVectorsData[CPU_EXCEPTION_NUM];
  25 extern EFI_CPU_INTERRUPT_HANDLER   mExternalInterruptHandlerTable[CPU_EXCEPTION_NUM];
  26 EXCEPTION_HANDLER_DATA      mExceptionHandlerData;
  27
  28 /**
  29   Initializes all CPU exceptions entries and provides the default exception handlers.
  30
  31   Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
  32   persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
  33   If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
  34   If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
  35
  36   @param[in]  VectorInfo    Pointer to reserved vector list.
  37
  38   @retval EFI_SUCCESS           CPU Exception Entries have been successfully initialized
  39                                 with default exception handlers.
  40   @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
  41   @retval EFI_UNSUPPORTED       This function is not supported.
  42
  43 **/
  44 EFI_STATUS
  45 EFIAPI
  46 InitializeCpuExceptionHandlers (
  47   IN EFI_VECTOR_HANDOFF_INFO       *VectorInfo OPTIONAL
  48   )
  49 {
  50   mExceptionHandlerData.ReservedVectors          = mReservedVectorsData;
  51   mExceptionHandlerData.ExternalInterruptHandler = mExternalInterruptHandlerTable;
  52   InitializeSpinLock (&mExceptionHandlerData.DisplayMessageSpinLock);
  53   return InitializeCpuExceptionHandlersWorker (VectorInfo, &mExceptionHandlerData);
  54 }
  55
  56 /**
  57   Initializes all CPU interrupt/exceptions entries and provides the default interrupt/exception handlers.
  58
  59   Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
  60   persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
  61   If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
  62   If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
  63
  64   @param[in]  VectorInfo    Pointer to reserved vector list.
  65
  66   @retval EFI_SUCCESS           All CPU interrupt/exception entries have been successfully initialized
  67                                 with default interrupt/exception handlers.
  68   @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
  69   @retval EFI_UNSUPPORTED       This function is not supported.
  70
  71 **/
  72 EFI_STATUS
  73 EFIAPI
  74 InitializeCpuInterruptHandlers (
  75   IN EFI_VECTOR_HANDOFF_INFO       *VectorInfo OPTIONAL
  76   )
  77 {
  78   EFI_STATUS                         Status;
  79   IA32_IDT_GATE_DESCRIPTOR           *IdtTable;
  80   IA32_DESCRIPTOR                    IdtDescriptor;
  81   UINTN                              IdtEntryCount;
  82   EXCEPTION_HANDLER_TEMPLATE_MAP     TemplateMap;
  83   UINTN                              Index;
  84   UINTN                              InterruptEntry;
  85   UINT8                              *InterruptEntryCode;
  86   RESERVED_VECTORS_DATA              *ReservedVectors;
  87   EFI_CPU_INTERRUPT_HANDLER          *ExternalInterruptHandler;
  88
  89   ReservedVectors = AllocatePool (sizeof (RESERVED_VECTORS_DATA) * CPU_INTERRUPT_NUM);
  90   ASSERT (ReservedVectors != NULL);
  91   SetMem ((VOID *) ReservedVectors, sizeof (RESERVED_VECTORS_DATA) * CPU_INTERRUPT_NUM, 0xff);
  92   if (VectorInfo != NULL) {
  93     Status = ReadAndVerifyVectorInfo (VectorInfo, ReservedVectors, CPU_INTERRUPT_NUM);
  94     if (EFI_ERROR (Status)) {
  95       FreePool (ReservedVectors);
  96       return EFI_INVALID_PARAMETER;
  97     }
  98   }
  99   InitializeSpinLock (&mDisplayMessageSpinLock);
 100   ExternalInterruptHandler = AllocateZeroPool (sizeof (EFI_CPU_INTERRUPT_HANDLER) * CPU_INTERRUPT_NUM);
 101   ASSERT (ExternalInterruptHandler != NULL);
 102
 103   //
 104   // Read IDT descriptor and calculate IDT size
 105   //
 106   AsmReadIdtr (&IdtDescriptor);
 107   IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);
 108   if (IdtEntryCount > CPU_INTERRUPT_NUM) {
 109     IdtEntryCount = CPU_INTERRUPT_NUM;
 110   }
 111   //
 112   // Create Interrupt Descriptor Table and Copy the old IDT table in
 113   //
 114   IdtTable = AllocateZeroPool (sizeof (IA32_IDT_GATE_DESCRIPTOR) * CPU_INTERRUPT_NUM);
 115   ASSERT (IdtTable != NULL);
 116   CopyMem (IdtTable, (VOID *)IdtDescriptor.Base, sizeof (IA32_IDT_GATE_DESCRIPTOR) * IdtEntryCount);
 117
 118   AsmGetTemplateAddressMap (&TemplateMap);
 119   ASSERT (TemplateMap.ExceptionStubHeaderSize <= HOOKAFTER_STUB_SIZE);
 120   InterruptEntryCode = AllocatePool (TemplateMap.ExceptionStubHeaderSize * CPU_INTERRUPT_NUM);
 121   ASSERT (InterruptEntryCode != NULL);
 122
 123   InterruptEntry = (UINTN) InterruptEntryCode;
 124   for (Index = 0; Index < CPU_INTERRUPT_NUM; Index ++) {
 125     CopyMem (
 126       (VOID *) InterruptEntry,
 127       (VOID *) TemplateMap.ExceptionStart,
 128       TemplateMap.ExceptionStubHeaderSize
 129       );
 130     AsmVectorNumFixup ((VOID *) InterruptEntry,  (UINT8) Index, (VOID *) TemplateMap.ExceptionStart);
 131     InterruptEntry += TemplateMap.ExceptionStubHeaderSize;
 132   }
 133
 134   TemplateMap.ExceptionStart = (UINTN) InterruptEntryCode;
 135   mExceptionHandlerData.IdtEntryCount            = CPU_INTERRUPT_NUM;
 136   mExceptionHandlerData.ReservedVectors          = ReservedVectors;
 137   mExceptionHandlerData.ExternalInterruptHandler = ExternalInterruptHandler;
 138   InitializeSpinLock (&mExceptionHandlerData.DisplayMessageSpinLock);
 139
 140   UpdateIdtTable (IdtTable, &TemplateMap, &mExceptionHandlerData);
 141
 142   //
 143   // Load Interrupt Descriptor Table
 144   //
 145   IdtDescriptor.Base  = (UINTN) IdtTable;
 146   IdtDescriptor.Limit = (UINT16) (sizeof (IA32_IDT_GATE_DESCRIPTOR) * CPU_INTERRUPT_NUM - 1);
 147   AsmWriteIdtr ((IA32_DESCRIPTOR *) &IdtDescriptor);
 148
 149   return EFI_SUCCESS;
 150 }
 151
 152 /**
 153   Registers a function to be called from the processor interrupt handler.
 154
 155   This function registers and enables the handler specified by InterruptHandler for a processor
 156   interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
 157   handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
 158   The installed handler is called once for each processor interrupt or exception.
 159   NOTE: This function should be invoked after InitializeCpuExceptionHandlers() or
 160   InitializeCpuInterruptHandlers() invoked, otherwise EFI_UNSUPPORTED returned.
 161
 162   @param[in]  InterruptType     Defines which interrupt or exception to hook.
 163   @param[in]  InterruptHandler  A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
 164                                 when a processor interrupt occurs. If this parameter is NULL, then the handler
 165                                 will be uninstalled.
 166
 167   @retval EFI_SUCCESS           The handler for the processor interrupt was successfully installed or uninstalled.
 168   @retval EFI_ALREADY_STARTED   InterruptHandler is not NULL, and a handler for InterruptType was
 169                                 previously installed.
 170   @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
 171                                 previously installed.
 172   @retval EFI_UNSUPPORTED       The interrupt specified by InterruptType is not supported,
 173                                 or this function is not supported.
 174 **/
 175 EFI_STATUS
 176 EFIAPI
 177 RegisterCpuInterruptHandler (
 178   IN EFI_EXCEPTION_TYPE            InterruptType,
 179   IN EFI_CPU_INTERRUPT_HANDLER     InterruptHandler
 180   )
 181 {
 182   return RegisterCpuInterruptHandlerWorker (InterruptType, InterruptHandler);
 183 }