EdkModulePkg/Universal/DataHub/DataHubStdErr/Dxe/DataHubStdErr.c

/*++

Copyright (c) 2006, 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:

  DataHubStdErr.c

Abstract:

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

--*/



EFI_DATA_HUB_PROTOCOL *mDataHub = NULL;

EFI_EVENT             mDataHubStdErrEvent;

STATIC
VOID
EFIAPI
DataHubStdErrEventHandler (
  IN EFI_EVENT Event,
  IN VOID      *Context
  )
/*++

Routine Description:
  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.

Arguments:
  Event    - The event that occured, not used
  Context  - DataHub Protocol Pointer
  
Returns:
  None.

--*/
{
  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_OUT_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 availible.
  //
  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, &gEfiStatusCodeGuid)) {
        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));
}

EFI_STATUS
EFIAPI
DataHubStdErrInitialize (
  IN EFI_HANDLE         ImageHandle,
  IN EFI_SYSTEM_TABLE   *SystemTable
  )
/*++

Routine Description:

  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.

Arguments:

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

Returns:

  EFI_SUCCESS             - The event handler was registered.
  EFI_OUT_OF_RESOURCES    - The event hadler was not registered due to lack of 
                            system resources.
  
--*/
{
  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 (
                  EFI_EVENT_NOTIFY_SIGNAL,
                  EFI_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,
                      EFI_TPL_CALLBACK,
                      DataClass,
                      NULL
                      );
  if (EFI_ERROR (Status)) {
    gBS->CloseEvent (mDataHubStdErrEvent);
  }

  return Status;
}