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- /** @file
- Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
- Copyright (c) 2011, ARM Limited. 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 <Guid/IdleLoopEvent.h>
- BOOLEAN mInterruptState = FALSE;
- /**
- 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 This The EFI_CPU_ARCH_PROTOCOL instance.
- @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_UNSUPPORTEDT 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
- CpuFlushCpuDataCache (
- IN EFI_CPU_ARCH_PROTOCOL *This,
- IN EFI_PHYSICAL_ADDRESS Start,
- IN UINT64 Length,
- IN EFI_CPU_FLUSH_TYPE FlushType
- )
- {
- switch (FlushType) {
- case EfiCpuFlushTypeWriteBack:
- WriteBackDataCacheRange ((VOID *)(UINTN)Start, (UINTN)Length);
- break;
- case EfiCpuFlushTypeInvalidate:
- InvalidateDataCacheRange ((VOID *)(UINTN)Start, (UINTN)Length);
- break;
- case EfiCpuFlushTypeWriteBackInvalidate:
- WriteBackInvalidateDataCacheRange ((VOID *)(UINTN)Start, (UINTN)Length);
- break;
- default:
- return EFI_INVALID_PARAMETER;
- }
- return EFI_SUCCESS;
- }
- /**
- This function enables interrupt processing by the processor.
- @param This The EFI_CPU_ARCH_PROTOCOL instance.
- @retval EFI_SUCCESS Interrupts are enabled on the processor.
- @retval EFI_DEVICE_ERROR Interrupts could not be enabled on the processor.
- **/
- EFI_STATUS
- EFIAPI
- CpuEnableInterrupt (
- IN EFI_CPU_ARCH_PROTOCOL *This
- )
- {
- ArmEnableInterrupts ();
- mInterruptState = TRUE;
- return EFI_SUCCESS;
- }
- /**
- This function disables interrupt processing by the processor.
- @param This The EFI_CPU_ARCH_PROTOCOL instance.
- @retval EFI_SUCCESS Interrupts are disabled on the processor.
- @retval EFI_DEVICE_ERROR Interrupts could not be disabled on the processor.
- **/
- EFI_STATUS
- EFIAPI
- CpuDisableInterrupt (
- IN EFI_CPU_ARCH_PROTOCOL *This
- )
- {
- ArmDisableInterrupts ();
- mInterruptState = FALSE;
- return EFI_SUCCESS;
- }
- /**
- This function retrieves the processor's current interrupt state a returns it in
- State. If interrupts are currently enabled, then TRUE is returned. If interrupts
- are currently disabled, then FALSE is returned.
- @param This The EFI_CPU_ARCH_PROTOCOL instance.
- @param State A pointer to the processor's current interrupt state. Set to TRUE if
- interrupts are enabled and FALSE if interrupts are disabled.
- @retval EFI_SUCCESS The processor's current interrupt state was returned in State.
- @retval EFI_INVALID_PARAMETER State is NULL.
- **/
- EFI_STATUS
- EFIAPI
- CpuGetInterruptState (
- IN EFI_CPU_ARCH_PROTOCOL *This,
- OUT BOOLEAN *State
- )
- {
- if (State == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- *State = mInterruptState;
- return EFI_SUCCESS;
- }
- /**
- This function generates an INIT on the processor. If this function succeeds, then the
- processor will be reset, and control will not be returned to the caller. If InitType is
- not supported by this processor, or the processor cannot programmatically generate an
- INIT without help from external hardware, then EFI_UNSUPPORTED is returned. If an error
- occurs attempting to generate an INIT, then EFI_DEVICE_ERROR is returned.
- @param This The EFI_CPU_ARCH_PROTOCOL instance.
- @param InitType The type of processor INIT to perform.
- @retval EFI_SUCCESS The processor INIT was performed. This return code should never be seen.
- @retval EFI_UNSUPPORTED The processor INIT operation specified by InitType is not supported
- by this processor.
- @retval EFI_DEVICE_ERROR The processor INIT failed.
- **/
- EFI_STATUS
- EFIAPI
- CpuInit (
- IN EFI_CPU_ARCH_PROTOCOL *This,
- IN EFI_CPU_INIT_TYPE InitType
- )
- {
- return EFI_UNSUPPORTED;
- }
- EFI_STATUS
- EFIAPI
- CpuRegisterInterruptHandler (
- IN EFI_CPU_ARCH_PROTOCOL *This,
- IN EFI_EXCEPTION_TYPE InterruptType,
- IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
- )
- {
- return RegisterInterruptHandler (InterruptType, InterruptHandler);
- }
- EFI_STATUS
- EFIAPI
- CpuGetTimerValue (
- IN EFI_CPU_ARCH_PROTOCOL *This,
- IN UINT32 TimerIndex,
- OUT UINT64 *TimerValue,
- OUT UINT64 *TimerPeriod OPTIONAL
- )
- {
- return EFI_UNSUPPORTED;
- }
- /**
- Callback function for idle events.
- @param Event Event whose notification function is being invoked.
- @param Context The pointer to the notification function's context,
- which is implementation-dependent.
- **/
- VOID
- EFIAPI
- IdleLoopEventCallback (
- IN EFI_EVENT Event,
- IN VOID *Context
- )
- {
- CpuSleep ();
- }
- //
- // Globals used to initialize the protocol
- //
- EFI_HANDLE mCpuHandle = NULL;
- EFI_CPU_ARCH_PROTOCOL mCpu = {
- CpuFlushCpuDataCache,
- CpuEnableInterrupt,
- CpuDisableInterrupt,
- CpuGetInterruptState,
- CpuInit,
- CpuRegisterInterruptHandler,
- CpuGetTimerValue,
- CpuSetMemoryAttributes,
- 0, // NumberOfTimers
- 4, // DmaBufferAlignment
- };
- EFI_STATUS
- CpuDxeInitialize (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
- {
- EFI_STATUS Status;
- EFI_EVENT IdleLoopEvent;
- InitializeExceptions (&mCpu);
- Status = gBS->InstallMultipleProtocolInterfaces (
- &mCpuHandle,
- &gEfiCpuArchProtocolGuid, &mCpu,
- &gVirtualUncachedPagesProtocolGuid, &gVirtualUncachedPages,
- NULL
- );
- //
- // Make sure GCD and MMU settings match. This API calls gDS->SetMemorySpaceAttributes ()
- // and that calls EFI_CPU_ARCH_PROTOCOL.SetMemoryAttributes, so this code needs to go
- // after the protocol is installed
- //
- SyncCacheConfig (&mCpu);
- // If the platform is a MPCore system then install the Configuration Table describing the
- // secondary core states
- if (ArmIsMpCore()) {
- PublishArmProcessorTable();
- }
- //
- // Setup a callback for idle events
- //
- Status = gBS->CreateEventEx (
- EVT_NOTIFY_SIGNAL,
- TPL_NOTIFY,
- IdleLoopEventCallback,
- NULL,
- &gIdleLoopEventGuid,
- &IdleLoopEvent
- );
- ASSERT_EFI_ERROR (Status);
- return Status;
- }
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