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/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Portions Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "CpuDxe.h"
#include <Chipset/AArch64.h>
VOID
ExceptionHandlersStart (
VOID
);
VOID
ExceptionHandlersEnd (
VOID
);
VOID
CommonExceptionEntry (
VOID
);
VOID
AsmCommonExceptionEntry (
VOID
);
EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
/**
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
)
{
if (InterruptType > MAX_AARCH64_EXCEPTION) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler != NULL) && (gExceptionHandlers[InterruptType] != NULL)) {
return EFI_ALREADY_STARTED;
}
gExceptionHandlers[InterruptType] = InterruptHandler;
return EFI_SUCCESS;
}
VOID
EFIAPI
CommonCExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
if (ExceptionType <= MAX_AARCH64_EXCEPTION) {
if (gExceptionHandlers[ExceptionType]) {
gExceptionHandlers[ExceptionType] (ExceptionType, SystemContext);
return;
}
} else {
DEBUG ((EFI_D_ERROR, "Unknown exception type %d from %016lx\n", ExceptionType, SystemContext.SystemContextAArch64->ELR));
ASSERT (FALSE);
}
DefaultExceptionHandler (ExceptionType, SystemContext);
}
EFI_STATUS
InitializeExceptions (
IN EFI_CPU_ARCH_PROTOCOL *Cpu
)
{
EFI_STATUS Status;
BOOLEAN IrqEnabled;
BOOLEAN FiqEnabled;
Status = EFI_SUCCESS;
ZeroMem (gExceptionHandlers,sizeof(*gExceptionHandlers));
//
// 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 ();
// The AArch64 Vector table must be 2k-byte aligned - if this assertion fails ensure 'Align=4K'
// is defined into your FDF for this module.
ASSERT (((UINTN)ExceptionHandlersStart & ARM_VECTOR_TABLE_ALIGNMENT) == 0);
// We do not copy the Exception Table at PcdGet32(PcdCpuVectorBaseAddress). We just set Vector
// Base Address to point into CpuDxe code.
ArmWriteVBar ((UINTN)ExceptionHandlersStart);
if (FiqEnabled) {
ArmEnableFiq ();
}
if (IrqEnabled) {
//
// Restore interrupt state
//
Status = Cpu->EnableInterrupt (Cpu);
}
return Status;
}
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