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/** @file
Copyright (c) 2008-2009, Apple Inc. All rights reserved.
All rights reserved. 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 <Library/CacheMaintenanceLib.h>
VOID
ExceptionHandlersStart (
VOID
);
VOID
ExceptionHandlersEnd (
VOID
);
VOID
CommonExceptionEntry (
VOID
);
VOID
AsmCommonExceptionEntry (
VOID
);
EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_ARM_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_ARM_EXCEPTION) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler == NULL) && (gExceptionHandlers[InterruptType] == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((InterruptHandler != NULL) && (gExceptionHandlers[InterruptType] != NULL)) {
return EFI_ALREADY_STARTED;
}
gExceptionHandlers[InterruptType] = InterruptHandler;
return EFI_SUCCESS;
}
VOID
EFIAPI
DefaultSWIExceptionHandler(
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
return;
}
VOID
EFIAPI
DefaultExceptionHandler(
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
DEBUG ((EFI_D_ERROR, "Exception %d from %x\n", ExceptionType, SystemContext.SystemContextArm->PC));
ASSERT (FALSE);
return;
}
EFI_STATUS
InitializeExceptions (
IN EFI_CPU_ARCH_PROTOCOL *Cpu
)
{
EFI_STATUS Status = EFI_SUCCESS;
UINTN Offset;
UINTN Length;
UINTN Index;
BOOLEAN Enabled;
//
// Disable interrupts
//
Cpu->GetInterruptState (Cpu, &Enabled);
Cpu->DisableInterrupt (Cpu);
//
// Initialize the C entry points for interrupts
//
for (Index = 0; Index <= MAX_ARM_EXCEPTION; Index++) {
if (Index == EXCEPT_ARM_SOFTWARE_INTERRUPT) {
Status = Cpu->RegisterInterruptHandler (Cpu, Index, DefaultSWIExceptionHandler);
} else {
Status = Cpu->RegisterInterruptHandler (Cpu, Index, DefaultExceptionHandler);
}
ASSERT_EFI_ERROR (Status);
}
//
// Copy an implementation of the ARM exception vectors to 0x0.
//
Length = (UINTN)ExceptionHandlersEnd - (UINTN)ExceptionHandlersStart;
CopyMem ((VOID *)(UINTN)PcdGet32 (PcdCpuVectorBaseAddress), (VOID *)ExceptionHandlersStart, Length);
//
// Patch in the common Assembly exception handler
//
Offset = (UINTN)CommonExceptionEntry - (UINTN)ExceptionHandlersStart;
*(UINTN *) ((UINT8 *)(UINTN)PcdGet32 (PcdCpuVectorBaseAddress) + Offset) = (UINTN)AsmCommonExceptionEntry;
//
// Flush Caches since we updated executable stuff
//
InvalidateInstructionCache ();
if (Enabled) {
//
// Restore interrupt state
//
Status = Cpu->EnableInterrupt (Cpu);
}
return Status;
}
/**
This function reads the processor timer specified by TimerIndex and returns it in TimerValue.
@param TimerIndex Specifies which processor timer is to be returned in TimerValue. This parameter
must be between 0 and NumberOfTimers-1.
@param TimerValue Pointer to the returned timer value.
@param TimerPeriod A pointer to the amount of time that passes in femtoseconds for each increment
of TimerValue.
@retval EFI_SUCCESS The processor timer value specified by TimerIndex was returned in TimerValue.
@retval EFI_DEVICE_ERROR An error occurred attempting to read one of the processor's timers.
@retval EFI_INVALID_PARAMETER TimerValue is NULL or TimerIndex is not valid.
@retval EFI_UNSUPPORTED The processor does not have any readable timers.
**/
EFI_STATUS
EFIAPI
GetTimerValue (
IN UINT32 TimerIndex,
OUT UINT64 *TimerValue,
OUT UINT64 *TimerPeriod OPTIONAL
)
{
return EFI_UNSUPPORTED;
}
/**
This function flushes the range of addresses from Start to Start+Length
from the processor's data cache. If Start is not aligned to a cache line
boundary, then the bytes before Start to the preceding cache line boundary
are also flushed. If Start+Length is not aligned to a cache line boundary,
then the bytes past Start+Length to the end of the next cache line boundary
are also flushed. The FlushType of EfiCpuFlushTypeWriteBackInvalidate must be
supported. If the data cache is fully coherent with all DMA operations, then
this function can just return EFI_SUCCESS. If the processor does not support
flushing a range of the data cache, then the entire data cache can be flushed.
@param Start The beginning physical address to flush from the processor's data
cache.
@param Length The number of bytes to flush from the processor's data cache. This
function may flush more bytes than Length specifies depending upon
the granularity of the flush operation that the processor supports.
@param FlushType Specifies the type of flush operation to perform.
@retval EFI_SUCCESS The address range from Start to Start+Length was flushed from
the processor's data cache.
@retval EFI_UNSUPPORTED The processor does not support the cache flush type specified
by FlushType.
@retval EFI_DEVICE_ERROR The address range from Start to Start+Length could not be flushed
from the processor's data cache.
**/
EFI_STATUS
EFIAPI
FlushCpuDataCache (
IN EFI_PHYSICAL_ADDRESS Start,
IN UINT64 Length,
IN EFI_CPU_FLUSH_TYPE FlushType
)
{
if (FlushType == EfiCpuFlushTypeWriteBackInvalidate) {
WriteBackInvalidateDataCacheRange((VOID *)(UINTN)Start, (UINTN)Length);
return EFI_SUCCESS;
} else if (FlushType == EfiCpuFlushTypeInvalidate) {
InvalidateDataCacheRange((VOID *)(UINTN)Start, (UINTN)Length);
return EFI_SUCCESS;
} else if (FlushType == EfiCpuFlushTypeWriteBack) {
WriteBackDataCacheRange((VOID *)(UINTN)Start, (UINTN)Length);
return EFI_SUCCESS;
} else {
return EFI_UNSUPPORTED;
}
}
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