/** @file | |
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> | |
Portions Copyright (c) 2011 - 2021, Arm Limited. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#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; | |
} | |
/** | |
This function registers and enables the handler specified by InterruptHandler for a processor | |
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the | |
handler for the processor interrupt or exception type specified by InterruptType is uninstalled. | |
The installed handler is called once for each processor interrupt or exception. | |
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts | |
are enabled and FALSE if interrupts are disabled. | |
@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called | |
when a processor interrupt occurs. If this parameter is NULL, then the handler | |
will be uninstalled. | |
@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled. | |
@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was | |
previously installed. | |
@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not | |
previously installed. | |
@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported. | |
**/ | |
EFI_STATUS | |
RegisterInterruptHandler ( | |
IN EFI_EXCEPTION_TYPE InterruptType, | |
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler | |
) | |
{ | |
// pass down to CpuExceptionHandlerLib | |
return (EFI_STATUS)RegisterCpuInterruptHandler (InterruptType, InterruptHandler); | |
} |