101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/** @file
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Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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Portions Copyright (c) 2011 - 2021, Arm Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "CpuDxe.h"
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#include <Library/CpuExceptionHandlerLib.h>
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#include <Guid/VectorHandoffTable.h>
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EFI_STATUS
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InitializeExceptions (
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IN EFI_CPU_ARCH_PROTOCOL *Cpu
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)
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{
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EFI_STATUS Status;
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EFI_VECTOR_HANDOFF_INFO *VectorInfoList;
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EFI_VECTOR_HANDOFF_INFO *VectorInfo;
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BOOLEAN IrqEnabled;
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BOOLEAN FiqEnabled;
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VectorInfo = (EFI_VECTOR_HANDOFF_INFO *)NULL;
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Status = EfiGetSystemConfigurationTable (&gEfiVectorHandoffTableGuid, (VOID **)&VectorInfoList);
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if ((Status == EFI_SUCCESS) && (VectorInfoList != NULL)) {
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VectorInfo = VectorInfoList;
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}
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// initialize the CpuExceptionHandlerLib so we take over the exception vector table from the DXE Core
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InitializeCpuExceptionHandlers (VectorInfo);
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Status = EFI_SUCCESS;
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//
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// Disable interrupts
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//
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Cpu->GetInterruptState (Cpu, &IrqEnabled);
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Cpu->DisableInterrupt (Cpu);
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//
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// EFI does not use the FIQ, but a debugger might so we must disable
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// as we take over the exception vectors.
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//
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FiqEnabled = ArmGetFiqState ();
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ArmDisableFiq ();
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if (FiqEnabled) {
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ArmEnableFiq ();
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}
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if (IrqEnabled) {
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//
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// Restore interrupt state
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//
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Status = Cpu->EnableInterrupt (Cpu);
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}
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//
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// On a DEBUG build, unmask SErrors so they are delivered right away rather
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// than when the OS unmasks them. This gives us a better chance of figuring
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// out the cause.
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//
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DEBUG_CODE (
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ArmEnableAsynchronousAbort ();
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);
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return Status;
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}
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/**
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This function registers and enables the handler specified by InterruptHandler for a processor
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interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
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handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
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The installed handler is called once for each processor interrupt or exception.
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@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts
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are enabled and FALSE if interrupts are disabled.
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@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
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when a processor interrupt occurs. If this parameter is NULL, then the handler
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will be uninstalled.
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@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
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@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
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previously installed.
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@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
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previously installed.
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@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported.
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**/
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EFI_STATUS
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RegisterInterruptHandler (
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IN EFI_EXCEPTION_TYPE InterruptType,
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IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
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)
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{
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// pass down to CpuExceptionHandlerLib
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return (EFI_STATUS)RegisterCpuInterruptHandler (InterruptType, InterruptHandler);
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}
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