3b3593b567
SErrors (formerly called asynchronous aborts) are a distinct class of exceptions that are not closely tied to the currently executing instruction. Since execution may be able to proceed in such a condition, this class of exception is masked by default, and software needs to unmask it explicitly if it is prepared to handle such exceptions. On DEBUG builds, we are well equipped to report the CPU context to the user and it makes sense to report an SError as soon as it occurs rather than to wait for the OS to take it when it unmasks them, especially since the current arm64/Linux implementation simply panics in that case. So unmask them when ArmCpuDxe loads. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
105 lines
3.6 KiB
C
105 lines
3.6 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 - 2014, ARM Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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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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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// intialize 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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// pass down to CpuExceptionHandlerLib
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return (EFI_STATUS)RegisterCpuInterruptHandler(InterruptType, InterruptHandler);
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}
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