/*++

Copyright (c) 2004 - 2009, Intel Corporation                                                         
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.  

Module Name:

  UefiNotTiano.c
  
Abstract: 

  Library functions that abstract areas of conflict between Tiano an UEFI 2.0.

  Help Port Framework/Tinao code that has conflicts with UEFI 2.0 by hiding the
  oldconflicts with library functions and supporting implementations of the old 
  (R8.5/EFI 1.10) and new (EdkII/UEFI 2.0) way.

--*/

#include "EdkIIGlueUefi.h"

/**
  An empty function to pass error checking of CreateEventEx (). 
  
  This empty function ensures that EFI_EVENT_NOTIFY_SIGNAL_ALL is error
  checked correctly since it is now mapped into CreateEventEx() in UEFI 2.0.
  
**/
STATIC
VOID
EFIAPI
InternalEmptyFuntion (
  IN EFI_EVENT                Event,
  IN VOID                     *Context
  )
{
  return;
}

/**
  Create a Legacy Boot Event.  
  
  Tiano extended the CreateEvent Type enum to add a legacy boot event type. 
  This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
  added and now it's possible to not voilate the UEFI specification by 
  declaring a GUID for the legacy boot event class. This library supports
  the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to 
  work both ways.

  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).

  @retval EFI_SUCCESS       Event was created.
  @retval Other             Event was not created.

**/
EFI_STATUS
EFIAPI
GlueEfiCreateEventLegacyBoot (
  OUT EFI_EVENT  *LegacyBootEvent
  )
{
  return EfiCreateEventLegacyBootEx (
           EFI_TPL_CALLBACK,
           NULL,
           NULL,
           LegacyBootEvent
           );
}

/**
  Create an EFI event in the Legacy Boot Event Group and allows
  the caller to specify a notification function.  
  
  This function abstracts the creation of the Legacy Boot Event.
  The Framework moved from a proprietary to UEFI 2.0 based mechanism.
  This library abstracts the caller from how this event is created to prevent
  to code form having to change with the version of the specification supported.
  If LegacyBootEvent is NULL, then ASSERT().

  @param  NotifyTpl         The task priority level of the event.
  @param  NotifyFunction    The notification function to call when the event is signaled.
  @param  NotifyContext     The content to pass to NotifyFunction when the event is signaled.
  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).

  @retval EFI_SUCCESS       Event was created.
  @retval Other             Event was not created.

**/
EFI_STATUS
EFIAPI
EfiCreateEventLegacyBootEx (
  IN  EFI_TPL           NotifyTpl,
  IN  EFI_EVENT_NOTIFY  NotifyFunction,  OPTIONAL
  IN  VOID              *NotifyContext,  OPTIONAL
  OUT EFI_EVENT         *LegacyBootEvent
  )
{
  EFI_STATUS        Status;
  UINT32            EventType;
  EFI_EVENT_NOTIFY  WorkerNotifyFunction;

  ASSERT (LegacyBootEvent != NULL);

#if (EFI_SPECIFICATION_VERSION < 0x00020000) 

  if (NotifyFunction == NULL) {
    EventType = EFI_EVENT_SIGNAL_LEGACY_BOOT | EFI_EVENT_NOTIFY_SIGNAL_ALL;
  } else {
    EventType = EFI_EVENT_SIGNAL_LEGACY_BOOT;
  }
  WorkerNotifyFunction = NotifyFunction;

  //
  // prior to UEFI 2.0 use Tiano extension to EFI
  //
  Status = gBS->CreateEvent (
                  EventType,
                  NotifyTpl,
                  WorkerNotifyFunction,
                  NotifyContext,
                  LegacyBootEvent
                  );
#else

  EventType = EVENT_NOTIFY_SIGNAL;
  if (NotifyFunction == NULL) {
    //
    // CreatEventEx will check NotifyFunction is NULL or not
    //
    WorkerNotifyFunction = InternalEmptyFuntion;
  } else {
    WorkerNotifyFunction = NotifyFunction;
  }

  //
  // For UEFI 2.0 and the future use an Event Group
  //
  Status = gBS->CreateEventEx (
                  EventType,
                  NotifyTpl,
                  WorkerNotifyFunction,
                  NotifyContext,
                  &gEfiEventLegacyBootGuid,
                  LegacyBootEvent
                  );
#endif

  return Status;
}

/**
  Create a Read to Boot Event.  
  
  Tiano extended the CreateEvent Type enum to add a ready to boot event type. 
  This was bad as Tiano did not own the enum. In UEFI 2.0 CreateEventEx was
  added and now it's possible to not voilate the UEFI specification and use 
  the ready to boot event class defined in UEFI 2.0. This library supports
  the EDK/EFI 1.10 form and EDK II/UEFI 2.0 form and allows common code to 
  work both ways.

  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).

  @retval EFI_SUCCESS       Event was created.
  @retval Other             Event was not created.

**/
EFI_STATUS
EFIAPI
GlueEfiCreateEventReadyToBoot (
  OUT EFI_EVENT  *ReadyToBootEvent
  )
{
  return EfiCreateEventReadyToBootEx (
           EFI_TPL_CALLBACK,
           NULL,
           NULL,
           ReadyToBootEvent
           );
}

/**
  Create an EFI event in the Ready To Boot Event Group and allows
  the caller to specify a notification function.  
  
  This function abstracts the creation of the Ready to Boot Event.
  The Framework moved from a proprietary to UEFI 2.0 based mechanism.
  This library abstracts the caller from how this event is created to prevent
  to code form having to change with the version of the specification supported.
  If ReadyToBootEvent is NULL, then ASSERT().

  @param  NotifyTpl         The task priority level of the event.
  @param  NotifyFunction    The notification function to call when the event is signaled.
  @param  NotifyContext     The content to pass to NotifyFunction when the event is signaled.
  @param  LegacyBootEvent   Returns the EFI event returned from gBS->CreateEvent(Ex).

  @retval EFI_SUCCESS       Event was created.
  @retval Other             Event was not created.

**/
EFI_STATUS
EFIAPI
EfiCreateEventReadyToBootEx (
  IN  EFI_TPL           NotifyTpl,
  IN  EFI_EVENT_NOTIFY  NotifyFunction,  OPTIONAL
  IN  VOID              *NotifyContext,  OPTIONAL
  OUT EFI_EVENT         *ReadyToBootEvent
  )
{
  EFI_STATUS        Status;
  UINT32            EventType;
  EFI_EVENT_NOTIFY	WorkerNotifyFunction;

  ASSERT (ReadyToBootEvent != NULL);

#if (EFI_SPECIFICATION_VERSION < 0x00020000)
  
  if (NotifyFunction == NULL) {
	EventType = EFI_EVENT_SIGNAL_READY_TO_BOOT | EFI_EVENT_NOTIFY_SIGNAL_ALL;
  } else {
	EventType = EFI_EVENT_SIGNAL_READY_TO_BOOT;
  }
  WorkerNotifyFunction = NotifyFunction;

  //
  // prior to UEFI 2.0 use Tiano extension to EFI
  //
  Status = gBS->CreateEvent (
                  EventType,
                  NotifyTpl,
                  WorkerNotifyFunction,
                  NotifyContext,
                  ReadyToBootEvent
                  );
#else

  EventType = EVENT_NOTIFY_SIGNAL;

  if (NotifyFunction == NULL) {
    //
    // CreatEventEx will check NotifyFunction is NULL or not
    //
    WorkerNotifyFunction = InternalEmptyFuntion;
  } else {
    WorkerNotifyFunction = NotifyFunction;
  }

  //
  // For UEFI 2.0 and the future use an Event Group
  //
  Status = gBS->CreateEventEx (
                  EventType,
                  NotifyTpl,
                  WorkerNotifyFunction,
                  NotifyContext,
                  &gEfiEventReadyToBootGuid,
                  ReadyToBootEvent
                  );
#endif

  return Status;
}


/**
  Signal a Ready to Boot Event.  
  
  Create a Ready to Boot Event. Signal it and close it. This causes other 
  events of the same event group to be signaled in other modules. 

**/
VOID
EFIAPI
EfiSignalEventReadyToBoot (
  VOID
  )
{
  EFI_STATUS    Status;
  EFI_EVENT     ReadyToBootEvent;

  Status = EfiCreateEventReadyToBoot (&ReadyToBootEvent);
  if (!EFI_ERROR (Status)) {
    gBS->SignalEvent (ReadyToBootEvent);
    gBS->CloseEvent (ReadyToBootEvent);
  }
}

/**
  Signal a Legacy Boot Event.  
  
  Create a legacy Boot Event. Signal it and close it. This causes other 
  events of the same event group to be signaled in other modules. 

**/
VOID
EFIAPI
EfiSignalEventLegacyBoot (
  VOID
  )
{
  EFI_STATUS    Status;
  EFI_EVENT     LegacyBootEvent;

  Status = EfiCreateEventLegacyBoot (&LegacyBootEvent);
  if (!EFI_ERROR (Status)) {
    gBS->SignalEvent (LegacyBootEvent);
    gBS->CloseEvent (LegacyBootEvent);
  }
}


/**
  Check to see if the Firmware Volume (FV) Media Device Path is valid 
  
  @param  FvDevicePathNode  Pointer to FV device path to check.

  @retval NULL              FvDevicePathNode is not valid.
  @retval Other             FvDevicePathNode is valid and pointer to NameGuid was returned.

**/
EFI_GUID *
EFIAPI
GlueEfiGetNameGuidFromFwVolDevicePathNode (
  IN CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH  *FvDevicePathNode
  )
{
  ASSERT (FvDevicePathNode != NULL);

  if (DevicePathType (&FvDevicePathNode->Header) == MEDIA_DEVICE_PATH &&
      DevicePathSubType (&FvDevicePathNode->Header) == MEDIA_FV_FILEPATH_DP) {
    return (EFI_GUID *) &FvDevicePathNode->NameGuid;
  }

  return NULL;
}


/**
  Initialize a Firmware Volume (FV) Media Device Path node.
  
  @param  FvDevicePathNode  Pointer to a FV device path node to initialize
  @param  NameGuid          FV file name to use in FvDevicePathNode

**/
VOID
EFIAPI
GlueEfiInitializeFwVolDevicepathNode (
  IN OUT MEDIA_FW_VOL_FILEPATH_DEVICE_PATH  *FvDevicePathNode,
  IN CONST EFI_GUID                         *NameGuid
  )
{
  ASSERT (FvDevicePathNode  != NULL);
  ASSERT (NameGuid          != NULL);

  FvDevicePathNode->Header.Type     = MEDIA_DEVICE_PATH;
  FvDevicePathNode->Header.SubType  = MEDIA_FV_FILEPATH_DP;
  SetDevicePathNodeLength (&FvDevicePathNode->Header, sizeof (MEDIA_FW_VOL_FILEPATH_DEVICE_PATH));

  CopyGuid (&FvDevicePathNode->NameGuid, NameGuid);
}