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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.
**/
/** @file
DXE Cpu Driver.
May need some porting work for platform specifics.
Copyright (c) 2008, Apple Inc
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"
EFI_PERIODIC_CALLBACK gPeriodicCallBack = (EFI_PERIODIC_CALLBACK)NULL;
EFI_DEBUG_SUPPORT_PERIODIC_CALLBACK_PROTOCOL *gDebugSupportCallback = NULL;
EFI_STATUS
EFIAPI
DebugSupportGetMaximumProcessorIndex (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
OUT UINTN *MaxProcessorIndex
)
/*++
Routine Description: This is a DebugSupport protocol member function.
Arguments:
This - The DebugSupport instance
MaxProcessorIndex - The maximuim supported processor index
Returns:
Always returns EFI_SUCCESS with *MaxProcessorIndex set to 0
--*/
{
*MaxProcessorIndex = 0;
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
DebugSupportRegisterPeriodicCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
)
/*++
Routine Description: This is a DebugSupport protocol member function.
Arguments:
This - The DebugSupport instance
ProcessorIndex - Which processor the callback applies to.
PeriodicCallback - Callback function
Returns:
EFI_SUCCESS
EFI_INVALID_PARAMETER - requested uninstalling a handler from a vector that has
no handler registered for it
EFI_ALREADY_STARTED - requested install to a vector that already has a handler registered.
Other possible return values are passed through from UnHookEntry and HookEntry.
--*/
{
if (ProcessorIndex != 0) {
return EFI_INVALID_PARAMETER;
}
if ((gPeriodicCallBack != (EFI_PERIODIC_CALLBACK)NULL) && (PeriodicCallback != (EFI_PERIODIC_CALLBACK)NULL)) {
return EFI_ALREADY_STARTED;
}
gPeriodicCallBack = PeriodicCallback;
if (gDebugSupportCallback != NULL) {
//
// We can only update this protocol if the Register Protocol Notify has fired. If it fires
// after this call it will update with gPeriodicCallBack value.
//
gDebugSupportCallback->PeriodicCallback = gPeriodicCallBack;
}
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
DebugSupportRegisterExceptionCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_EXCEPTION_CALLBACK NewCallback,
IN EFI_EXCEPTION_TYPE ExceptionType
)
/*++
Routine Description:
This is a DebugSupport protocol member function.
This code executes in boot services context.
Arguments:
This - The DebugSupport instance
ProcessorIndex - Which processor the callback applies to.
NewCallback - Callback function
ExceptionType - Which exception to hook
Returns:
EFI_SUCCESS
EFI_INVALID_PARAMETER - requested uninstalling a handler from a vector that has
no handler registered for it
EFI_ALREADY_STARTED - requested install to a vector that already has a handler registered.
Other possible return values are passed through from UnHookEntry and HookEntry.
--*/
{
if (ProcessorIndex != 0) {
return EFI_INVALID_PARAMETER;
}
return RegisterDebuggerInterruptHandler (ExceptionType, NewCallback);
}
EFI_STATUS
EFIAPI
DebugSupportInvalidateInstructionCache (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN VOID *Start,
IN UINT64 Length
)
/*++
Routine Description:
This is a DebugSupport protocol member function.
Calls assembly routine to flush cache.
Arguments:
This - The DebugSupport instance
ProcessorIndex - Which processor the callback applies to.
Start - Physical base of the memory range to be invalidated
Length - mininum number of bytes in instruction cache to invalidate
Returns:
EFI_SUCCESS - always return success
--*/
{
if (ProcessorIndex != 0) {
return EFI_INVALID_PARAMETER;
}
InvalidateInstructionCache();
return EFI_SUCCESS;
}
//
// This is a global that is the actual interface
//
EFI_DEBUG_SUPPORT_PROTOCOL gDebugSupportProtocolInterface = {
IsaArm, // Fixme to be more generic
DebugSupportGetMaximumProcessorIndex,
DebugSupportRegisterPeriodicCallback,
DebugSupportRegisterExceptionCallback,
DebugSupportInvalidateInstructionCache
};
VOID
EFIAPI
DebugSupportPeriodicCallbackEventProtocolNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
Status = gBS->LocateProtocol (&gEfiDebugSupportPeriodicCallbackProtocolGuid, NULL, (VOID **)&gDebugSupportCallback);
if (!EFI_ERROR (Status)) {
gDebugSupportCallback->PeriodicCallback = gPeriodicCallBack;
}
}
VOID *gRegistration = NULL;
EFI_DEBUG_SUPPORT_PROTOCOL *
InitilaizeDebugSupport (
VOID
)
{
// RPN gEfiDebugSupportPeriodicCallbackProtocolGuid
EFI_STATUS Status;
EFI_EVENT Event;
if (!FeaturePcdGet (PcdCpuDxeProduceDebugSupport)) {
// Don't include this code unless Feature Flag is set
return NULL;
}
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
DebugSupportPeriodicCallbackEventProtocolNotify,
NULL,
&Event
);
ASSERT_EFI_ERROR (Status);
Status = gBS->RegisterProtocolNotify (&gEfiDebugSupportPeriodicCallbackProtocolGuid, Event, &gRegistration);
ASSERT_EFI_ERROR (Status);
//
// We assume the Timer must depend on our driver to register interrupts so we don't need to do
// a gBS->SignalEvent (Event) here to check to see if the protocol allready exists
//
return &gDebugSupportProtocolInterface;
}
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