/** @file
  Data Hub filter driver that takes DEBUG () info from Data Hub and writes it
  to StdErr if it exists.

Copyright (c) 2006 - 2009, Intel Corporation. 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 <FrameworkDxe.h>
#include <Guid/DataHubStatusCodeRecord.h>
#include <Guid/StatusCodeDataTypeId.h>
#include <Guid/StatusCodeDataTypeDebug.h>
#include <Protocol/DataHub.h>
#include <Protocol/SimpleTextOut.h>

#include <Library/DebugLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>

EFI_DATA_HUB_PROTOCOL *mDataHub = NULL;

EFI_EVENT             mDataHubStdErrEvent;

/**
  Event handler registered with the Data Hub to parse EFI_DEBUG_CODE. This
  handler reads the Data Hub and sends any DEBUG info to StdErr.

  @param Event      The event that occured, not used
  @param Context    DataHub Protocol Pointer
**/
VOID
EFIAPI
DataHubStdErrEventHandler (
  IN EFI_EVENT Event,
  IN VOID      *Context
  )
{
  EFI_STATUS                           Status;
  EFI_DATA_HUB_PROTOCOL                *DataHub;
  EFI_DATA_RECORD_HEADER               *Record;
  DATA_HUB_STATUS_CODE_DATA_RECORD     *DataRecord;
  UINT64                               Mtc;
  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL      *Sto;
  INT32                                OldAttribute;

  DataHub = (EFI_DATA_HUB_PROTOCOL *) Context;

  //
  // If StdErr is not yet initialized just return a DEBUG print in the BDS
  // after consoles are connect will make sure data gets flushed properly
  // when StdErr is available.
  //
  if (gST == NULL) {
    return ;
  }

  if (gST->StdErr == NULL) {
    return ;
  }
  
  //
  // Mtc of zero means return the next record that has not been read by the
  // event handler.
  //
  Mtc = 0;
  do {
    Status = DataHub->GetNextRecord (DataHub, &Mtc, &mDataHubStdErrEvent, &Record);
    if (!EFI_ERROR(Status)) {
      if (CompareGuid (&Record->DataRecordGuid, &gEfiDataHubStatusCodeRecordGuid)) {
        DataRecord = (DATA_HUB_STATUS_CODE_DATA_RECORD *) (((CHAR8 *) Record) + Record->HeaderSize);

        if (DataRecord->Data.HeaderSize > 0) {
          if (CompareGuid (&DataRecord->Data.Type, &gEfiStatusCodeDataTypeDebugGuid)) {
            //
            // If the Data record is from a DEBUG () then send it to Standard Error
            //
            Sto           = gST->StdErr;
            OldAttribute  = Sto->Mode->Attribute;
            Sto->SetAttribute (Sto, EFI_TEXT_ATTR (EFI_MAGENTA, EFI_BLACK));
            Sto->OutputString (Sto, (CHAR16 *) (DataRecord + 1));
            Sto->SetAttribute (Sto, OldAttribute);
          }
        }
      }
    }
  } while ((Mtc != 0) && !EFI_ERROR(Status));
}

/**
  Register an event handler with the Data Hub to parse EFI_DEBUG_CODE. This
  handler reads the Data Hub and sends any DEBUG info to StdErr.

  @param ImageHandle                Image handle of this driver.
  @param SystemTable                Pointer to EFI system table.

  @retval EFI_SUCCESS               The event handler was registered.
  @retval EFI_OUT_OF_RESOURCES      The event hadler was not registered due to lack of system resources.
**/
EFI_STATUS
EFIAPI
DataHubStdErrInitialize (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
{
  EFI_STATUS  Status;
  UINT64      DataClass;

  gBS->LocateProtocol (&gEfiDataHubProtocolGuid, NULL, (VOID **) &mDataHub);
  //
  // Should never fail due to Depex grammer.
  //
  ASSERT (mDataHub != NULL);

  //
  // Create an event and register it with the filter driver
  //
  Status = gBS->CreateEvent (
                  EVT_NOTIFY_SIGNAL,
                  TPL_CALLBACK,
                  DataHubStdErrEventHandler,
                  mDataHub,
                  &mDataHubStdErrEvent
                  );
  if (EFI_ERROR(Status)) {
    return Status;
  }

  DataClass = EFI_DATA_RECORD_CLASS_DEBUG | EFI_DATA_RECORD_CLASS_ERROR;
  Status = mDataHub->RegisterFilterDriver (
                      mDataHub,
                      mDataHubStdErrEvent,
                      TPL_CALLBACK,
                      DataClass,
                      NULL
                      );
  if (EFI_ERROR(Status)) {
    gBS->CloseEvent (mDataHubStdErrEvent);
  }

  return Status;
}