mirror of https://github.com/acidanthera/audk.git
155 lines
4.5 KiB
C
155 lines
4.5 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 <Chipset/AArch64.h>
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VOID
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ExceptionHandlersStart (
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VOID
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);
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VOID
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ExceptionHandlersEnd (
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VOID
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);
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VOID
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CommonExceptionEntry (
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VOID
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);
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VOID
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AsmCommonExceptionEntry (
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VOID
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);
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EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
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EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
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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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if (InterruptType > MAX_AARCH64_EXCEPTION) {
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return EFI_UNSUPPORTED;
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}
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if ((InterruptHandler != NULL) && (gExceptionHandlers[InterruptType] != NULL)) {
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return EFI_ALREADY_STARTED;
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}
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gExceptionHandlers[InterruptType] = InterruptHandler;
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return EFI_SUCCESS;
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}
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VOID
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EFIAPI
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CommonCExceptionHandler (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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IN OUT EFI_SYSTEM_CONTEXT SystemContext
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)
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{
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if (ExceptionType <= MAX_AARCH64_EXCEPTION) {
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if (gExceptionHandlers[ExceptionType]) {
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gExceptionHandlers[ExceptionType] (ExceptionType, SystemContext);
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return;
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}
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} else {
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DEBUG ((EFI_D_ERROR, "Unknown exception type %d from %016lx\n", ExceptionType, SystemContext.SystemContextAArch64->ELR));
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ASSERT (FALSE);
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}
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DefaultExceptionHandler (ExceptionType, SystemContext);
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}
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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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BOOLEAN IrqEnabled;
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BOOLEAN FiqEnabled;
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Status = EFI_SUCCESS;
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ZeroMem (gExceptionHandlers,sizeof(*gExceptionHandlers));
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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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// The AArch64 Vector table must be 2k-byte aligned - if this assertion fails ensure 'Align=4K'
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// is defined into your FDF for this module.
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ASSERT (((UINTN)ExceptionHandlersStart & ARM_VECTOR_TABLE_ALIGNMENT) == 0);
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// We do not copy the Exception Table at PcdGet32(PcdCpuVectorBaseAddress). We just set Vector
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// Base Address to point into CpuDxe code.
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ArmWriteVBar ((UINTN)ExceptionHandlersStart);
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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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return Status;
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}
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