Exception.c

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#include "CpuDxe.h"
#include <Library/CpuExceptionHandlerLib.h>
#include <Guid/VectorHandoffTable.h>
 
EFI_STATUS
InitializeExceptions (
  IN EFI_CPU_ARCH_PROTOCOL  *Cpu
  )
{
  EFI_STATUS               Status;
  EFI_VECTOR_HANDOFF_INFO  *VectorInfoList;
  EFI_VECTOR_HANDOFF_INFO  *VectorInfo;
  BOOLEAN                  IrqEnabled;
  BOOLEAN                  FiqEnabled;
 
  VectorInfo = (EFI_VECTOR_HANDOFF_INFO *)NULL;
  Status     = EfiGetSystemConfigurationTable (&gEfiVectorHandoffTableGuid, (VOID **)&VectorInfoList);
  if ((Status == EFI_SUCCESS) && (VectorInfoList != NULL)) {
    VectorInfo = VectorInfoList;
  }
 
  // initialize the CpuExceptionHandlerLib so we take over the exception vector table from the DXE Core
  InitializeCpuExceptionHandlers (VectorInfo);
 
  Status = EFI_SUCCESS;
 
  //
  // Disable interrupts
  //
  Cpu->GetInterruptState (Cpu, &IrqEnabled);
  Cpu->DisableInterrupt (Cpu);
 
  //
  // EFI does not use the FIQ, but a debugger might so we must disable
  // as we take over the exception vectors.
  //
  FiqEnabled = ArmGetFiqState ();
  ArmDisableFiq ();
 
  if (FiqEnabled) {
    ArmEnableFiq ();
  }
 
  if (IrqEnabled) {
    //
    // Restore interrupt state
    //
    Status = Cpu->EnableInterrupt (Cpu);
  }
 
  //
  // On a DEBUG build, unmask SErrors so they are delivered right away rather
  // than when the OS unmasks them. This gives us a better chance of figuring
  // out the cause.
  //
  DEBUG_CODE (
    ArmEnableAsynchronousAbort ();
    );
 
  return Status;
}
 
EFI_STATUS
RegisterInterruptHandler (
  IN EFI_EXCEPTION_TYPE         InterruptType,
  IN EFI_CPU_INTERRUPT_HANDLER  InterruptHandler
  )
{
  // pass down to CpuExceptionHandlerLib
  return (EFI_STATUS)RegisterCpuInterruptHandler (InterruptType, InterruptHandler);
}