/** @file
  ConsoleOut Routines that speak VGA.

Copyright (c) 2007 - 2013, Intel Corporation. All rights reserved.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "FbGop.h"

EFI_PIXEL_BITMASK  mPixelBitMask = {0x0000FF, 0x00FF00, 0xFF0000, 0x000000};

//
// Save controller attributes during first start
//
UINT64                         mOriginalPciAttributes;
BOOLEAN                        mPciAttributesSaved = FALSE;


//
// EFI Driver Binding Protocol Instance
//
EFI_DRIVER_BINDING_PROTOCOL gFbGopDriverBinding = {
  FbGopDriverBindingSupported,
  FbGopDriverBindingStart,
  FbGopDriverBindingStop,
  0x3,
  NULL,
  NULL
};

//
// Native resolution in EDID DetailedTiming[0]
//
UINT32    mNativeModeHorizontal;
UINT32    mNativeModeVertical;

/**
  Supported.

  @param  This                   Pointer to driver binding protocol
  @param  Controller             Controller handle to connect
  @param  RemainingDevicePath    A pointer to the remaining portion of a device
                                 path

  @retval EFI_STATUS             EFI_SUCCESS:This controller can be managed by this
                                 driver, Otherwise, this controller cannot be
                                 managed by this driver

**/
EFI_STATUS
EFIAPI
FbGopDriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS                Status;
  EFI_PCI_IO_PROTOCOL       *PciIo;
  PCI_TYPE00                Pci;
  EFI_DEV_PATH              *Node;

  //
  // Open the IO Abstraction(s) needed to perform the supported test
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // See if this is a PCI Graphics Controller by looking at the Command register and
  // Class Code Register
  //
  Status = PciIo->Pci.Read (
                        PciIo,
                        EfiPciIoWidthUint32,
                        0,
                        sizeof (Pci) / sizeof (UINT32),
                        &Pci
                        );
  if (EFI_ERROR (Status)) {
    Status = EFI_UNSUPPORTED;
    goto Done;
  }

  Status = EFI_UNSUPPORTED;
  if (Pci.Hdr.ClassCode[2] == 0x03 || (Pci.Hdr.ClassCode[2] == 0x00 && Pci.Hdr.ClassCode[1] == 0x01)) {

    Status = EFI_SUCCESS;
    //
    // If this is a graphics controller,
    // go further check RemainingDevicePath validation
    //
    if (RemainingDevicePath != NULL) {
      Node = (EFI_DEV_PATH *) RemainingDevicePath;
      //
      // Check if RemainingDevicePath is the End of Device Path Node, 
      // if yes, return EFI_SUCCESS
      //
      if (!IsDevicePathEnd (Node)) {
        //
        // If RemainingDevicePath isn't the End of Device Path Node,
        // check its validation
        //
        if (Node->DevPath.Type != ACPI_DEVICE_PATH ||
            Node->DevPath.SubType != ACPI_ADR_DP ||
            DevicePathNodeLength(&Node->DevPath) < sizeof(ACPI_ADR_DEVICE_PATH)) {
          Status = EFI_UNSUPPORTED;
        }
      }
    }
  }

Done:
  gBS->CloseProtocol (
         Controller,
         &gEfiPciIoProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  return Status;
}


/**
  Install Graphics Output Protocol onto VGA device handles.

  @param  This                   Pointer to driver binding protocol
  @param  Controller             Controller handle to connect
  @param  RemainingDevicePath    A pointer to the remaining portion of a device
                                 path

  @return EFI_STATUS

**/
EFI_STATUS
EFIAPI
FbGopDriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;
  EFI_PCI_IO_PROTOCOL       *PciIo;  
  UINT64                    Supports;

  DEBUG ((EFI_D_INFO, "GOP START\n"));
  
  //
  // Initialize local variables
  //
  PciIo            = NULL;
  ParentDevicePath = NULL;

  //
  // Prepare for status code
  //
  Status = gBS->HandleProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &ParentDevicePath
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Open the IO Abstraction(s) needed
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  (VOID **) &PciIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
    return Status;
  }

  //
  // Save original PCI attributes
  //
  if (!mPciAttributesSaved) {
    Status = PciIo->Attributes (
                      PciIo,
                      EfiPciIoAttributeOperationGet,
                      0,
                      &mOriginalPciAttributes
                      );
    
    if (EFI_ERROR (Status)) {
      goto Done;
    }
    mPciAttributesSaved = TRUE;
  }

  //
  // Get supported PCI attributes
  //
  Status = PciIo->Attributes (
                    PciIo,
                    EfiPciIoAttributeOperationSupported,
                    0,
                    &Supports
                    );
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  Supports &= (EFI_PCI_IO_ATTRIBUTE_VGA_IO | EFI_PCI_IO_ATTRIBUTE_VGA_IO_16);
  if (Supports == 0 || Supports == (EFI_PCI_IO_ATTRIBUTE_VGA_IO | EFI_PCI_IO_ATTRIBUTE_VGA_IO_16)) {
    Status = EFI_UNSUPPORTED;
    goto Done;
  }  
  
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    EFI_PERIPHERAL_LOCAL_CONSOLE | EFI_P_PC_ENABLE,
    ParentDevicePath
    );
  //
  // Enable the device and make sure VGA cycles are being forwarded to this VGA device
  //
  Status = PciIo->Attributes (
             PciIo,
             EfiPciIoAttributeOperationEnable,
             EFI_PCI_DEVICE_ENABLE,
             NULL
             );
  if (EFI_ERROR (Status)) {
    REPORT_STATUS_CODE_WITH_DEVICE_PATH (
      EFI_ERROR_CODE | EFI_ERROR_MINOR,
      EFI_PERIPHERAL_LOCAL_CONSOLE | EFI_P_EC_RESOURCE_CONFLICT,
      ParentDevicePath
      );
    goto Done;
  }

  if (RemainingDevicePath != NULL) {
    if (IsDevicePathEnd (RemainingDevicePath)) {
      //
      // If RemainingDevicePath is the End of Device Path Node,
      // don't create any child device and return EFI_SUCCESS
      Status = EFI_SUCCESS;
      goto Done;
    }
  }
  
  //
  // Create child handle and install GraphicsOutputProtocol on it
  //
  Status = FbGopChildHandleInstall (
             This,
             Controller,
             PciIo,
             NULL,
             ParentDevicePath,
             RemainingDevicePath
             );
  
Done:
  if ((EFI_ERROR (Status)) && (Status != EFI_ALREADY_STARTED)) {
          
    REPORT_STATUS_CODE_WITH_DEVICE_PATH (
      EFI_PROGRESS_CODE,
      EFI_PERIPHERAL_LOCAL_CONSOLE | EFI_P_PC_DISABLE,
      ParentDevicePath
      );

    REPORT_STATUS_CODE_WITH_DEVICE_PATH (
      EFI_PROGRESS_CODE,
      EFI_PERIPHERAL_LOCAL_CONSOLE | EFI_P_EC_NOT_DETECTED,
      ParentDevicePath
      );
    if (!HasChildHandle (Controller)) {
      if (mPciAttributesSaved) {
        //
        // Restore original PCI attributes
        //
        PciIo->Attributes (
                        PciIo,
                        EfiPciIoAttributeOperationSet,
                        mOriginalPciAttributes,
                        NULL
                        );
      }
    }
    //
    // Release PCI I/O Protocols on the controller handle.
    //
    gBS->CloseProtocol (
           Controller,
           &gEfiPciIoProtocolGuid,
           This->DriverBindingHandle,
           Controller
           );
  }

  return Status;
}


/**
  Stop.

  @param  This                   Pointer to driver binding protocol
  @param  Controller             Controller handle to connect
  @param  NumberOfChildren       Number of children handle created by this driver
  @param  ChildHandleBuffer      Buffer containing child handle created

  @retval EFI_SUCCESS            Driver disconnected successfully from controller
  @retval EFI_UNSUPPORTED        Cannot find FB_VIDEO_DEV structure

**/
EFI_STATUS
EFIAPI
FbGopDriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL     *This,
  IN  EFI_HANDLE                      Controller,
  IN  UINTN                           NumberOfChildren,
  IN  EFI_HANDLE                      *ChildHandleBuffer
  )
{
  EFI_STATUS                   Status;
  BOOLEAN                      AllChildrenStopped;
  UINTN                        Index;
  EFI_PCI_IO_PROTOCOL          *PciIo;

  AllChildrenStopped = TRUE;

  if (NumberOfChildren == 0) {
    //
    // Close PCI I/O protocol on the controller handle
    //
    gBS->CloseProtocol (
           Controller,
           &gEfiPciIoProtocolGuid,
           This->DriverBindingHandle,
           Controller
           );

    return EFI_SUCCESS;
  }

  for (Index = 0; Index < NumberOfChildren; Index++) {
        
    Status = EFI_SUCCESS;

    FbGopChildHandleUninstall (This, Controller, ChildHandleBuffer[Index]);

    if (EFI_ERROR (Status)) {
      AllChildrenStopped = FALSE;
    }
  }

  if (!AllChildrenStopped) {
    return EFI_DEVICE_ERROR;
  }

  if (!HasChildHandle (Controller)) {
    if (mPciAttributesSaved) {
      Status = gBS->HandleProtocol (
                      Controller,
                      &gEfiPciIoProtocolGuid,
                      (VOID **) &PciIo
                      );
      ASSERT_EFI_ERROR (Status);
      
      //
      // Restore original PCI attributes
      //
      Status = PciIo->Attributes (
                        PciIo,
                        EfiPciIoAttributeOperationSet,
                        mOriginalPciAttributes,
                        NULL
                        );
      ASSERT_EFI_ERROR (Status);
    }
  }


  return EFI_SUCCESS;
}


/**
  Install child handles if the Handle supports MBR format.

  @param  This                   Calling context.
  @param  ParentHandle           Parent Handle
  @param  ParentPciIo            Parent PciIo interface
  @param  ParentLegacyBios       Parent LegacyBios interface
  @param  ParentDevicePath       Parent Device Path
  @param  RemainingDevicePath    Remaining Device Path

  @retval EFI_SUCCESS            If a child handle was added
  @retval other                  A child handle was not added

**/
EFI_STATUS
FbGopChildHandleInstall (
  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN  EFI_HANDLE                   ParentHandle,
  IN  EFI_PCI_IO_PROTOCOL          *ParentPciIo,
  IN  VOID                         *ParentLegacyBios,
  IN  EFI_DEVICE_PATH_PROTOCOL     *ParentDevicePath,
  IN  EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS               Status;
  FB_VIDEO_DEV            *FbGopPrivate;
  PCI_TYPE00               Pci;
  ACPI_ADR_DEVICE_PATH     AcpiDeviceNode;

  //
  // Allocate the private device structure for video device
  //
  FbGopPrivate = (FB_VIDEO_DEV *) AllocateZeroPool (
																					sizeof (FB_VIDEO_DEV)
																					);
  if (NULL == FbGopPrivate) {
		Status = EFI_OUT_OF_RESOURCES;
    goto Done;
  }

  //
  // See if this is a VGA compatible controller or not
  //
  Status = ParentPciIo->Pci.Read (
                          ParentPciIo,
                          EfiPciIoWidthUint32,
                          0,
                          sizeof (Pci) / sizeof (UINT32),
                          &Pci
                          );
  if (EFI_ERROR (Status)) {
    REPORT_STATUS_CODE_WITH_DEVICE_PATH (
      EFI_ERROR_CODE | EFI_ERROR_MINOR,
      EFI_PERIPHERAL_LOCAL_CONSOLE | EFI_P_EC_CONTROLLER_ERROR,
      ParentDevicePath
      );
    goto Done;
  }
  
  //
  // Initialize the child private structure
  //
  FbGopPrivate->Signature = FB_VIDEO_DEV_SIGNATURE;

  //
  // Fill in Graphics Output specific mode structures
  //  
  FbGopPrivate->ModeData              = NULL;
    
  FbGopPrivate->VbeFrameBuffer        = NULL;

  FbGopPrivate->EdidDiscovered.SizeOfEdid  = 0;
  FbGopPrivate->EdidDiscovered.Edid        = NULL;
  FbGopPrivate->EdidActive.SizeOfEdid      = 0;
  FbGopPrivate->EdidActive.Edid            = NULL;
  
  //
  // Fill in the Graphics Output Protocol
  //
  FbGopPrivate->GraphicsOutput.QueryMode = FbGopGraphicsOutputQueryMode;
  FbGopPrivate->GraphicsOutput.SetMode   = FbGopGraphicsOutputSetMode;


  //
  // Allocate buffer for Graphics Output Protocol mode information
  //
  FbGopPrivate->GraphicsOutput.Mode = (EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *) AllocatePool (
                                             sizeof (EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE)
                                             );
  if (NULL == FbGopPrivate->GraphicsOutput.Mode) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Done;
  }

  FbGopPrivate->GraphicsOutput.Mode->Info = (EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *) AllocatePool (
                                             sizeof (EFI_GRAPHICS_OUTPUT_MODE_INFORMATION)
                                             );
  if (NULL ==  FbGopPrivate->GraphicsOutput.Mode->Info) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Done;
  }

  //
  // Set Gop Device Path, here RemainingDevicePath will not be one End of Device Path Node.
  //
  if ((RemainingDevicePath == NULL) || (!IsDevicePathEnd (RemainingDevicePath))) {
    if (RemainingDevicePath == NULL) {
      ZeroMem (&AcpiDeviceNode, sizeof (ACPI_ADR_DEVICE_PATH));
      AcpiDeviceNode.Header.Type = ACPI_DEVICE_PATH;
      AcpiDeviceNode.Header.SubType = ACPI_ADR_DP;
      AcpiDeviceNode.ADR = ACPI_DISPLAY_ADR (1, 0, 0, 1, 0, ACPI_ADR_DISPLAY_TYPE_VGA, 0, 0);
      SetDevicePathNodeLength (&AcpiDeviceNode.Header, sizeof (ACPI_ADR_DEVICE_PATH));
    
      FbGopPrivate->GopDevicePath = AppendDevicePathNode (
                                          ParentDevicePath,
                                          (EFI_DEVICE_PATH_PROTOCOL *) &AcpiDeviceNode
                                          );
    } else {
      FbGopPrivate->GopDevicePath = AppendDevicePathNode (ParentDevicePath, RemainingDevicePath);
    }
    
    //
    // Creat child handle and device path protocol firstly
    //
    FbGopPrivate->Handle = NULL;
    Status = gBS->InstallMultipleProtocolInterfaces (
                    &FbGopPrivate->Handle,
                    &gEfiDevicePathProtocolGuid,
                    FbGopPrivate->GopDevicePath,
                    NULL
                    );
    if (EFI_ERROR (Status)) {
      goto Done;
    }
  }
  
  //
  // When check for VBE, PCI I/O protocol is needed, so use parent's protocol interface temporally
  //
  FbGopPrivate->PciIo                 = ParentPciIo;

  //
  // Check for VESA BIOS Extensions for modes that are compatible with Graphics Output
  //
  Status = FbGopCheckForVbe (FbGopPrivate);
  DEBUG ((EFI_D_INFO, "FbGopCheckForVbe - %r\n", Status));
  
  if (EFI_ERROR (Status)) {
    Status = EFI_UNSUPPORTED;
    //goto Done;    
  }

  //
  // Creat child handle and install Graphics Output Protocol,EDID Discovered/Active Protocol
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &FbGopPrivate->Handle,
                  &gEfiGraphicsOutputProtocolGuid,
                  &FbGopPrivate->GraphicsOutput,  
                  &gEfiEdidDiscoveredProtocolGuid,
                  &FbGopPrivate->EdidDiscovered,                                                    
                  &gEfiEdidActiveProtocolGuid,
                  &FbGopPrivate->EdidActive,                  
                  NULL
                  );

  if (!EFI_ERROR (Status)) {
    //
    // Open the Parent Handle for the child
    //
    Status = gBS->OpenProtocol (
                    ParentHandle,
                    &gEfiPciIoProtocolGuid,
                    (VOID **) &FbGopPrivate->PciIo,
                    This->DriverBindingHandle,
                    FbGopPrivate->Handle,
                    EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                    );
    if (EFI_ERROR (Status)) {
      goto Done;
    }
  }
  
Done:
  if (EFI_ERROR (Status)) {
    //
    // Free private data structure
    //
    FbGopDeviceReleaseResource (FbGopPrivate);
  }

  return Status;
}


/**
  Deregister an video child handle and free resources.

  @param  This                   Protocol instance pointer.
  @param  Controller             Video controller handle
  @param  Handle                 Video child handle

  @return EFI_STATUS

**/
EFI_STATUS
FbGopChildHandleUninstall (
  EFI_DRIVER_BINDING_PROTOCOL    *This,
  EFI_HANDLE                     Controller,
  EFI_HANDLE                     Handle
  )
{
  EFI_STATUS                    Status;
  EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput;  
  FB_VIDEO_DEV                 *FbGopPrivate;
  EFI_PCI_IO_PROTOCOL          *PciIo;

  FbGopPrivate     = NULL;
  GraphicsOutput   = NULL;
  PciIo            = NULL;
  Status           = EFI_UNSUPPORTED;

  Status = gBS->OpenProtocol (
                  Handle,
                  &gEfiGraphicsOutputProtocolGuid,
                  (VOID **) &GraphicsOutput,
                  This->DriverBindingHandle,
                  Handle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (!EFI_ERROR (Status)) {
      FbGopPrivate = FB_VIDEO_DEV_FROM_GRAPHICS_OUTPUT_THIS (GraphicsOutput);
  }
  
  if (FbGopPrivate == NULL) {
    return EFI_UNSUPPORTED;
  }

  //
  // Close PCI I/O protocol that opened by child handle
  //
  Status = gBS->CloseProtocol (
                  Controller,
                  &gEfiPciIoProtocolGuid,
                  This->DriverBindingHandle,
                  Handle
                  );

  //
  // Uninstall protocols on child handle
  //
  Status = gBS->UninstallMultipleProtocolInterfaces (
                    FbGopPrivate->Handle,
                    &gEfiDevicePathProtocolGuid,
                    FbGopPrivate->GopDevicePath,
                    &gEfiGraphicsOutputProtocolGuid,
                    &FbGopPrivate->GraphicsOutput,
                    NULL
                    );
 
  if (EFI_ERROR (Status)) {
    gBS->OpenProtocol (
           Controller,
           &gEfiPciIoProtocolGuid,
           (VOID **) &PciIo,
           This->DriverBindingHandle,
           Handle,
           EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
           );
    return Status;
  }
  
  //
  // Release all allocated resources
  //
  FbGopDeviceReleaseResource (FbGopPrivate);

  return EFI_SUCCESS;
}


/**
  Release resource for bios video instance.

  @param  FbGopPrivate       Video child device private data structure

**/
VOID
FbGopDeviceReleaseResource (
  FB_VIDEO_DEV  *FbGopPrivate
  )
{
  if (FbGopPrivate == NULL) {
    return ;
  }

  //
  // Release all the resources occupied by the FB_VIDEO_DEV
  //
  
  //
  // Free VBE Frame Buffer
  //
  if (FbGopPrivate->VbeFrameBuffer != NULL) {
    FreePool (FbGopPrivate->VbeFrameBuffer);
  }
  
  //
  // Free mode data
  //
  if (FbGopPrivate->ModeData != NULL) {
    FreePool (FbGopPrivate->ModeData);
  }  

  //
  // Free graphics output protocol occupied resource
  //
  if (FbGopPrivate->GraphicsOutput.Mode != NULL) {
    if (FbGopPrivate->GraphicsOutput.Mode->Info != NULL) {
        FreePool (FbGopPrivate->GraphicsOutput.Mode->Info);
        FbGopPrivate->GraphicsOutput.Mode->Info = NULL;
    }
    FreePool (FbGopPrivate->GraphicsOutput.Mode);
    FbGopPrivate->GraphicsOutput.Mode = NULL;
  }  

  if (FbGopPrivate->GopDevicePath!= NULL) {
    FreePool (FbGopPrivate->GopDevicePath);
  }

  FreePool (FbGopPrivate);

  return ;
}



/**
  Check if all video child handles have been uninstalled.

  @param  Controller             Video controller handle

  @return TRUE                   Child handles exist.
  @return FALSE                  All video child handles have been uninstalled.

**/
BOOLEAN
HasChildHandle (
  IN EFI_HANDLE  Controller
  )
{
  UINTN                                Index;
  EFI_OPEN_PROTOCOL_INFORMATION_ENTRY  *OpenInfoBuffer;
  UINTN                                EntryCount;
  BOOLEAN                              HasChild;

  EntryCount = 0;
  HasChild   = FALSE;
  gBS->OpenProtocolInformation (
         Controller,
         &gEfiPciIoProtocolGuid,
         &OpenInfoBuffer,
         &EntryCount
         );
  for (Index = 0; Index < EntryCount; Index++) {
    if ((OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) != 0) {
      HasChild = TRUE;
    }
  }
  
  return HasChild;
}

/**
  Check for VBE device.

  @param  FbGopPrivate       Pointer to FB_VIDEO_DEV structure

  @retval EFI_SUCCESS            VBE device found

**/
EFI_STATUS
FbGopCheckForVbe (
  IN OUT FB_VIDEO_DEV  *FbGopPrivate
  )
{
  EFI_STATUS                             Status;  
  FB_VIDEO_MODE_DATA                     *ModeBuffer;
  FB_VIDEO_MODE_DATA                     *CurrentModeData;  
  UINTN                                  ModeNumber;  
  UINTN                                  BitsPerPixel; 
  UINTN                                  BytesPerScanLine;
  UINT32                                 HorizontalResolution;
  UINT32                                 VerticalResolution;
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL          *VbeFrameBuffer;  
  EFI_HOB_GUID_TYPE                      *GuidHob;
  FRAME_BUFFER_INFO                      *pFbInfo;
  
  Status = EFI_SUCCESS;
  //
  // Find the frame buffer information guid hob
  //
  GuidHob = GetFirstGuidHob (&gUefiFrameBufferInfoGuid);
  ASSERT (GuidHob != NULL);
  pFbInfo = (FRAME_BUFFER_INFO *)GET_GUID_HOB_DATA (GuidHob);
  
  //
  // Add mode to the list of available modes
  //
  VbeFrameBuffer = NULL;
  ModeBuffer     = NULL;
  
  ModeNumber           = 1;  
  BitsPerPixel         = pFbInfo->BitsPerPixel;
  HorizontalResolution = pFbInfo->HorizontalResolution;
  VerticalResolution   = pFbInfo->VerticalResolution;
  BytesPerScanLine     = pFbInfo->BytesPerScanLine;
  
  ModeBuffer = (FB_VIDEO_MODE_DATA *) AllocatePool (
																						ModeNumber * sizeof (FB_VIDEO_MODE_DATA)
																			);
  if (NULL == ModeBuffer) {
	  Status = EFI_OUT_OF_RESOURCES;
    goto Done;
  }

  VbeFrameBuffer =
			(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) AllocatePool (
																					BytesPerScanLine * VerticalResolution
																				  );
  if (NULL == VbeFrameBuffer) {
	  Status = EFI_OUT_OF_RESOURCES;
    goto Done;
  }
       
  if (FbGopPrivate->ModeData != NULL) {
    FreePool (FbGopPrivate->ModeData);
  }
    
  if (FbGopPrivate->VbeFrameBuffer != NULL) {
    FreePool (FbGopPrivate->VbeFrameBuffer);
  }  
  
  CurrentModeData = &ModeBuffer[ModeNumber - 1];
  CurrentModeData->BytesPerScanLine = (UINT16)BytesPerScanLine;
  
  CurrentModeData->Red      = *(FB_VIDEO_COLOR_PLACEMENT *)&(pFbInfo->Red);  
  CurrentModeData->Blue     = *(FB_VIDEO_COLOR_PLACEMENT *)&(pFbInfo->Blue);    
  CurrentModeData->Green    = *(FB_VIDEO_COLOR_PLACEMENT *)&(pFbInfo->Green);    
  CurrentModeData->Reserved = *(FB_VIDEO_COLOR_PLACEMENT *)&(pFbInfo->Reserved);  
  
  CurrentModeData->BitsPerPixel    = (UINT32)BitsPerPixel;
  CurrentModeData->HorizontalResolution = HorizontalResolution;
  CurrentModeData->VerticalResolution   = VerticalResolution;  
  CurrentModeData->FrameBufferSize = CurrentModeData->BytesPerScanLine * CurrentModeData->VerticalResolution;    
  CurrentModeData->LinearFrameBuffer = (VOID *) (UINTN) pFbInfo->LinearFrameBuffer;
  CurrentModeData->VbeModeNumber        = 0;
  CurrentModeData->ColorDepth           = 32;
  CurrentModeData->RefreshRate          = 60;
  
  CurrentModeData->PixelFormat = PixelBitMask;
  if ((CurrentModeData->BitsPerPixel == 32) &&
      (CurrentModeData->Red.Mask == 0xff) && (CurrentModeData->Green.Mask == 0xff) && (CurrentModeData->Blue.Mask == 0xff)) {
    if ((CurrentModeData->Red.Position == 0) && (CurrentModeData->Green.Position == 8) && (CurrentModeData->Blue.Position == 16)) {
      CurrentModeData->PixelFormat = PixelRedGreenBlueReserved8BitPerColor;
    } else if ((CurrentModeData->Blue.Position == 0) && (CurrentModeData->Green.Position == 8) && (CurrentModeData->Red.Position == 16)) {
      CurrentModeData->PixelFormat = PixelBlueGreenRedReserved8BitPerColor;
    }
  }  
  
  CopyMem (&(CurrentModeData->PixelBitMask), &mPixelBitMask, sizeof (EFI_PIXEL_BITMASK));    
          
  FbGopPrivate->ModeData       = ModeBuffer;
  FbGopPrivate->VbeFrameBuffer = VbeFrameBuffer;
  
  //
  // Assign Gop's Blt function
  //
  FbGopPrivate->GraphicsOutput.Blt     = FbGopGraphicsOutputVbeBlt;
  
  FbGopPrivate->GraphicsOutput.Mode->MaxMode = 1;
  FbGopPrivate->GraphicsOutput.Mode->Mode    = 0;      
  FbGopPrivate->GraphicsOutput.Mode->Info->Version = 0;
  FbGopPrivate->GraphicsOutput.Mode->Info->HorizontalResolution = HorizontalResolution;
  FbGopPrivate->GraphicsOutput.Mode->Info->VerticalResolution   = VerticalResolution;   
  FbGopPrivate->GraphicsOutput.Mode->Info->PixelFormat = CurrentModeData->PixelFormat;
  CopyMem (&(FbGopPrivate->GraphicsOutput.Mode->Info->PixelInformation), &mPixelBitMask, sizeof (EFI_PIXEL_BITMASK));  
  FbGopPrivate->GraphicsOutput.Mode->Info->PixelsPerScanLine = (UINT32)(BytesPerScanLine * 8 / BitsPerPixel);
  FbGopPrivate->GraphicsOutput.Mode->SizeOfInfo = sizeof(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION);
  FbGopPrivate->GraphicsOutput.Mode->FrameBufferBase = (EFI_PHYSICAL_ADDRESS) (UINTN) CurrentModeData->LinearFrameBuffer;
  FbGopPrivate->GraphicsOutput.Mode->FrameBufferSize =  CurrentModeData->FrameBufferSize;
  
  //
  // Find the best mode to initialize
  //  

Done:
  //
  // If there was an error, then free the mode structure
  //
  if (EFI_ERROR (Status)) {
      
    if (VbeFrameBuffer != NULL) {
      FreePool (VbeFrameBuffer);
    }    
    
    if (ModeBuffer != NULL) {
      FreePool (ModeBuffer);
    }    
  }

  return Status;
}


//
// Graphics Output Protocol Member Functions for VESA BIOS Extensions
//

/**
  Graphics Output protocol interface to get video mode.

  @param  This                   Protocol instance pointer.
  @param  ModeNumber             The mode number to return information on.
  @param  SizeOfInfo             A pointer to the size, in bytes, of the Info
                                 buffer.
  @param  Info                   Caller allocated buffer that returns information
                                 about ModeNumber.

  @retval EFI_SUCCESS            Mode information returned.
  @retval EFI_DEVICE_ERROR       A hardware error occurred trying to retrieve the
                                 video mode.
  @retval EFI_NOT_STARTED        Video display is not initialized. Call SetMode ()
  @retval EFI_INVALID_PARAMETER  One of the input args was NULL.

**/
EFI_STATUS
EFIAPI
FbGopGraphicsOutputQueryMode (
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL          *This,
  IN  UINT32                                ModeNumber,
  OUT UINTN                                 *SizeOfInfo,
  OUT EFI_GRAPHICS_OUTPUT_MODE_INFORMATION  **Info
  )
{
  FB_VIDEO_DEV        *FbGopPrivate;
  FB_VIDEO_MODE_DATA  *ModeData;

  FbGopPrivate = FB_VIDEO_DEV_FROM_GRAPHICS_OUTPUT_THIS (This);

  if (This == NULL || Info == NULL || SizeOfInfo == NULL || ModeNumber >= This->Mode->MaxMode) {
    return EFI_INVALID_PARAMETER;
  }

  *Info = (EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *) AllocatePool (
																										sizeof (EFI_GRAPHICS_OUTPUT_MODE_INFORMATION)
																										);
  if (NULL == *Info) {
    return EFI_OUT_OF_RESOURCES;
  }

  *SizeOfInfo = sizeof (EFI_GRAPHICS_OUTPUT_MODE_INFORMATION);

  ModeData = &FbGopPrivate->ModeData[ModeNumber];
  (*Info)->Version = 0;
  (*Info)->HorizontalResolution = ModeData->HorizontalResolution;
  (*Info)->VerticalResolution   = ModeData->VerticalResolution;
  (*Info)->PixelFormat = ModeData->PixelFormat;
  CopyMem (&((*Info)->PixelInformation), &(ModeData->PixelBitMask), sizeof(ModeData->PixelBitMask));

  (*Info)->PixelsPerScanLine =  (ModeData->BytesPerScanLine * 8) / ModeData->BitsPerPixel;

  return EFI_SUCCESS;
}

/**
  Graphics Output protocol interface to set video mode.

  @param  This                   Protocol instance pointer.
  @param  ModeNumber             The mode number to be set.

  @retval EFI_SUCCESS            Graphics mode was changed.
  @retval EFI_DEVICE_ERROR       The device had an error and could not complete the
                                 request.
  @retval EFI_UNSUPPORTED        ModeNumber is not supported by this device.

**/
EFI_STATUS
EFIAPI
FbGopGraphicsOutputSetMode (
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL * This,
  IN  UINT32                       ModeNumber
  )
{  
  FB_VIDEO_DEV          *FbGopPrivate;
  FB_VIDEO_MODE_DATA    *ModeData;
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Background;

  if (This == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  FbGopPrivate = FB_VIDEO_DEV_FROM_GRAPHICS_OUTPUT_THIS (This);

  ModeData = &FbGopPrivate->ModeData[ModeNumber];

  if (ModeNumber >= This->Mode->MaxMode) {
    return EFI_UNSUPPORTED;
  }
  
  if (ModeNumber == This->Mode->Mode) {
    //
    // Clear screen to black
    //    
    ZeroMem (&Background, sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
    FbGopGraphicsOutputVbeBlt (
                        This,
                        &Background,
                        EfiBltVideoFill,
                        0,
                        0,
                        0,
                        0,
                        ModeData->HorizontalResolution,
                        ModeData->VerticalResolution,
                        0
    );
    return EFI_SUCCESS;
  } else {
    return EFI_UNSUPPORTED;
  }
  
}

/**
  Update physical frame buffer, copy 4 bytes block, then copy remaining bytes.

  @param   PciIo              The pointer of EFI_PCI_IO_PROTOCOL
  @param   VbeBuffer          The data to transfer to screen
  @param   MemAddress         Physical frame buffer base address
  @param   DestinationX       The X coordinate of the destination for BltOperation
  @param   DestinationY       The Y coordinate of the destination for BltOperation
  @param   TotalBytes         The total bytes of copy
  @param   VbePixelWidth      Bytes per pixel
  @param   BytesPerScanLine   Bytes per scan line

**/
VOID
CopyVideoBuffer (
  IN  EFI_PCI_IO_PROTOCOL   *PciIo,
  IN  UINT8                 *VbeBuffer,
  IN  VOID                  *MemAddress,
  IN  UINTN                 DestinationX,
  IN  UINTN                 DestinationY,
  IN  UINTN                 TotalBytes,
  IN  UINT32                VbePixelWidth,
  IN  UINTN                 BytesPerScanLine
  )
{
  UINTN                 FrameBufferAddr;
  UINTN                 CopyBlockNum;
  UINTN                 RemainingBytes;
  UINTN                 UnalignedBytes;
  EFI_STATUS            Status;

  FrameBufferAddr = (UINTN) MemAddress + (DestinationY * BytesPerScanLine) + DestinationX * VbePixelWidth;

  //
  // If TotalBytes is less than 4 bytes, only start byte copy.
  //
  if (TotalBytes < 4) {
    Status = PciIo->Mem.Write (
                     PciIo,
                     EfiPciIoWidthUint8,
                     EFI_PCI_IO_PASS_THROUGH_BAR,
                     (UINT64) FrameBufferAddr,
                     TotalBytes,
                     VbeBuffer
                     );
    ASSERT_EFI_ERROR (Status);
    return;
  }

  //
  // If VbeBuffer is not 4-byte aligned, start byte copy.
  //
  UnalignedBytes  = (4 - ((UINTN) VbeBuffer & 0x3)) & 0x3;

  if (UnalignedBytes != 0) {
    Status = PciIo->Mem.Write (
                     PciIo,
                     EfiPciIoWidthUint8,
                     EFI_PCI_IO_PASS_THROUGH_BAR,
                     (UINT64) FrameBufferAddr,
                     UnalignedBytes,
                     VbeBuffer
                     );
    ASSERT_EFI_ERROR (Status);
    FrameBufferAddr += UnalignedBytes;
    VbeBuffer       += UnalignedBytes;
  }

  //
  // Calculate 4-byte block count and remaining bytes.
  //
  CopyBlockNum   = (TotalBytes - UnalignedBytes) >> 2;
  RemainingBytes = (TotalBytes - UnalignedBytes) &  3;

  //
  // Copy 4-byte block and remaining bytes to physical frame buffer.
  //
  if (CopyBlockNum != 0) {
    Status = PciIo->Mem.Write (
                    PciIo,
                    EfiPciIoWidthUint32,
                    EFI_PCI_IO_PASS_THROUGH_BAR,
                    (UINT64) FrameBufferAddr,
                    CopyBlockNum,
                    VbeBuffer
                    );
    ASSERT_EFI_ERROR (Status);
  }

  if (RemainingBytes != 0) {
    FrameBufferAddr += (CopyBlockNum << 2);
    VbeBuffer       += (CopyBlockNum << 2);
    Status = PciIo->Mem.Write (
                    PciIo,
                    EfiPciIoWidthUint8,
                    EFI_PCI_IO_PASS_THROUGH_BAR,
                    (UINT64) FrameBufferAddr,
                    RemainingBytes,
                    VbeBuffer
                    );
    ASSERT_EFI_ERROR (Status);
  }
}

/**
  Worker function to block transfer for VBE device.

  @param  FbGopPrivate       Instance of FB_VIDEO_DEV
  @param  BltBuffer              The data to transfer to screen
  @param  BltOperation           The operation to perform
  @param  SourceX                The X coordinate of the source for BltOperation
  @param  SourceY                The Y coordinate of the source for BltOperation
  @param  DestinationX           The X coordinate of the destination for
                                 BltOperation
  @param  DestinationY           The Y coordinate of the destination for
                                 BltOperation
  @param  Width                  The width of a rectangle in the blt rectangle in
                                 pixels
  @param  Height                 The height of a rectangle in the blt rectangle in
                                 pixels
  @param  Delta                  Not used for EfiBltVideoFill and
                                 EfiBltVideoToVideo operation. If a Delta of 0 is
                                 used, the entire BltBuffer will be operated on. If
                                 a subrectangle of the BltBuffer is used, then
                                 Delta represents the number of bytes in a row of
                                 the BltBuffer.
  @param  Mode                   Mode data.

  @retval EFI_INVALID_PARAMETER  Invalid parameter passed in
  @retval EFI_SUCCESS            Blt operation success

**/
EFI_STATUS
FbGopVbeBltWorker (
  IN  FB_VIDEO_DEV                       *FbGopPrivate,
  IN  EFI_GRAPHICS_OUTPUT_BLT_PIXEL      *BltBuffer, OPTIONAL
  IN  EFI_GRAPHICS_OUTPUT_BLT_OPERATION  BltOperation,
  IN  UINTN                              SourceX,
  IN  UINTN                              SourceY,
  IN  UINTN                              DestinationX,
  IN  UINTN                              DestinationY,
  IN  UINTN                              Width,
  IN  UINTN                              Height,
  IN  UINTN                              Delta,
  IN  FB_VIDEO_MODE_DATA               *Mode
  )
{
  EFI_PCI_IO_PROTOCOL            *PciIo;
  EFI_TPL                        OriginalTPL;
  UINTN                          DstY;
  UINTN                          SrcY;
  UINTN                          DstX;
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL  *Blt;
  VOID                           *MemAddress;
  EFI_GRAPHICS_OUTPUT_BLT_PIXEL  *VbeFrameBuffer;
  UINTN                          BytesPerScanLine;
  UINTN                          Index;
  UINT8                          *VbeBuffer;
  UINT8                          *VbeBuffer1;
  UINT8                          *BltUint8;
  UINT32                         VbePixelWidth;
  UINT32                         Pixel;
  UINTN                          TotalBytes;

  PciIo             = FbGopPrivate->PciIo;

  VbeFrameBuffer    = FbGopPrivate->VbeFrameBuffer;
  MemAddress        = Mode->LinearFrameBuffer;
  BytesPerScanLine  = Mode->BytesPerScanLine;
  VbePixelWidth     = Mode->BitsPerPixel / 8;
  BltUint8          = (UINT8 *) BltBuffer;
  TotalBytes        = Width * VbePixelWidth;

  if (((UINTN) BltOperation) >= EfiGraphicsOutputBltOperationMax) {
    return EFI_INVALID_PARAMETER;
  }

  if (Width == 0 || Height == 0) {
    return EFI_INVALID_PARAMETER;
  }
  //
  // We need to fill the Virtual Screen buffer with the blt data.
  // The virtual screen is upside down, as the first row is the bottom row of
  // the image.
  //
  if (BltOperation == EfiBltVideoToBltBuffer) {
    //
    // Video to BltBuffer: Source is Video, destination is BltBuffer
    //
    if (SourceY + Height > Mode->VerticalResolution) {
      return EFI_INVALID_PARAMETER;
    }

    if (SourceX + Width > Mode->HorizontalResolution) {
      return EFI_INVALID_PARAMETER;
    }
  } else {
    //
    // BltBuffer to Video: Source is BltBuffer, destination is Video
    //
    if (DestinationY + Height > Mode->VerticalResolution) {
      return EFI_INVALID_PARAMETER;
    }

    if (DestinationX + Width > Mode->HorizontalResolution) {
      return EFI_INVALID_PARAMETER;
    }
  }
  //
  // If Delta is zero, then the entire BltBuffer is being used, so Delta
  // is the number of bytes in each row of BltBuffer.  Since BltBuffer is Width pixels size,
  // the number of bytes in each row can be computed.
  //
  if (Delta == 0) {
    Delta = Width * sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL);
  }
  //
  // We have to raise to TPL Notify, so we make an atomic write the frame buffer.
  // We would not want a timer based event (Cursor, ...) to come in while we are
  // doing this operation.
  //
  OriginalTPL = gBS->RaiseTPL (TPL_NOTIFY);

  switch (BltOperation) {
  case EfiBltVideoToBltBuffer:
    for (SrcY = SourceY, DstY = DestinationY; DstY < (Height + DestinationY); SrcY++, DstY++) {
      Blt = (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) (BltUint8 + DstY * Delta + DestinationX * sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
      //
      // Shuffle the packed bytes in the hardware buffer to match EFI_GRAPHICS_OUTPUT_BLT_PIXEL
      //
      VbeBuffer = ((UINT8 *) VbeFrameBuffer + (SrcY * BytesPerScanLine + SourceX * VbePixelWidth));
      for (DstX = DestinationX; DstX < (Width + DestinationX); DstX++) {
        Pixel         = VbeBuffer[0] | VbeBuffer[1] << 8 | VbeBuffer[2] << 16 | VbeBuffer[3] << 24;
        Blt->Red      = (UINT8) ((Pixel >> Mode->Red.Position) & Mode->Red.Mask);
        Blt->Blue     = (UINT8) ((Pixel >> Mode->Blue.Position) & Mode->Blue.Mask);
        Blt->Green    = (UINT8) ((Pixel >> Mode->Green.Position) & Mode->Green.Mask);
        Blt->Reserved = 0;
        Blt++;
        VbeBuffer += VbePixelWidth;
      }

    }
    break;

  case EfiBltVideoToVideo:
    for (Index = 0; Index < Height; Index++) {
      if (DestinationY <= SourceY) {
        SrcY  = SourceY + Index;
        DstY  = DestinationY + Index;
      } else {
        SrcY  = SourceY + Height - Index - 1;
        DstY  = DestinationY + Height - Index - 1;
      }

      VbeBuffer   = ((UINT8 *) VbeFrameBuffer + DstY * BytesPerScanLine + DestinationX * VbePixelWidth);
      VbeBuffer1  = ((UINT8 *) VbeFrameBuffer + SrcY * BytesPerScanLine + SourceX * VbePixelWidth);

      gBS->CopyMem (
            VbeBuffer,
            VbeBuffer1,
            TotalBytes
            );

      //
      // Update physical frame buffer.
      //
      CopyVideoBuffer (
        PciIo,
        VbeBuffer,
        MemAddress,
        DestinationX,
        DstY,
        TotalBytes,
        VbePixelWidth,
        BytesPerScanLine
        );
    }
    break;

  case EfiBltVideoFill:
    VbeBuffer = (UINT8 *) ((UINTN) VbeFrameBuffer + (DestinationY * BytesPerScanLine) + DestinationX * VbePixelWidth);
    Blt       = (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) BltUint8;
    //
    // Shuffle the RGB fields in EFI_GRAPHICS_OUTPUT_BLT_PIXEL to match the hardware buffer
    //
    Pixel = ((Blt->Red & Mode->Red.Mask) << Mode->Red.Position) |
      (
        (Blt->Green & Mode->Green.Mask) <<
        Mode->Green.Position
      ) |
          ((Blt->Blue & Mode->Blue.Mask) << Mode->Blue.Position);

    for (Index = 0; Index < Width; Index++) {
      gBS->CopyMem (
            VbeBuffer,
            &Pixel,
            VbePixelWidth
            );
      VbeBuffer += VbePixelWidth;
    }

    VbeBuffer = (UINT8 *) ((UINTN) VbeFrameBuffer + (DestinationY * BytesPerScanLine) + DestinationX * VbePixelWidth);
    for (DstY = DestinationY + 1; DstY < (Height + DestinationY); DstY++) {
      gBS->CopyMem (
            (VOID *) ((UINTN) VbeFrameBuffer + (DstY * BytesPerScanLine) + DestinationX * VbePixelWidth),
            VbeBuffer,
            TotalBytes
            );
    }

    for (DstY = DestinationY; DstY < (Height + DestinationY); DstY++) {
      //
      // Update physical frame buffer.
      //
      CopyVideoBuffer (
        PciIo,
        VbeBuffer,
        MemAddress,
        DestinationX,
        DstY,
        TotalBytes,
        VbePixelWidth,
        BytesPerScanLine
        );
    }
    break;

  case EfiBltBufferToVideo:
    for (SrcY = SourceY, DstY = DestinationY; SrcY < (Height + SourceY); SrcY++, DstY++) {
      Blt       = (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) (BltUint8 + (SrcY * Delta) + (SourceX) * sizeof (EFI_GRAPHICS_OUTPUT_BLT_PIXEL));
      VbeBuffer = ((UINT8 *) VbeFrameBuffer + (DstY * BytesPerScanLine + DestinationX * VbePixelWidth));
      for (DstX = DestinationX; DstX < (Width + DestinationX); DstX++) {
        //
        // Shuffle the RGB fields in EFI_GRAPHICS_OUTPUT_BLT_PIXEL to match the hardware buffer
        //
        Pixel = ((Blt->Red & Mode->Red.Mask) << Mode->Red.Position) |
          ((Blt->Green & Mode->Green.Mask) << Mode->Green.Position) |
            ((Blt->Blue & Mode->Blue.Mask) << Mode->Blue.Position);
        gBS->CopyMem (
              VbeBuffer,
              &Pixel,
              VbePixelWidth
              );
        Blt++;
        VbeBuffer += VbePixelWidth;
      }

      VbeBuffer = ((UINT8 *) VbeFrameBuffer + (DstY * BytesPerScanLine + DestinationX * VbePixelWidth));

      //
      // Update physical frame buffer.
      //
      CopyVideoBuffer (
        PciIo,
        VbeBuffer,
        MemAddress,
        DestinationX,
        DstY,
        TotalBytes,
        VbePixelWidth,
        BytesPerScanLine
        );
    }
    break;

    default: ;
  }

  gBS->RestoreTPL (OriginalTPL);

  return EFI_SUCCESS;
}

/**
  Graphics Output protocol instance to block transfer for VBE device.

  @param  This                   Pointer to Graphics Output protocol instance
  @param  BltBuffer              The data to transfer to screen
  @param  BltOperation           The operation to perform
  @param  SourceX                The X coordinate of the source for BltOperation
  @param  SourceY                The Y coordinate of the source for BltOperation
  @param  DestinationX           The X coordinate of the destination for
                                 BltOperation
  @param  DestinationY           The Y coordinate of the destination for
                                 BltOperation
  @param  Width                  The width of a rectangle in the blt rectangle in
                                 pixels
  @param  Height                 The height of a rectangle in the blt rectangle in
                                 pixels
  @param  Delta                  Not used for EfiBltVideoFill and
                                 EfiBltVideoToVideo operation. If a Delta of 0 is
                                 used, the entire BltBuffer will be operated on. If
                                 a subrectangle of the BltBuffer is used, then
                                 Delta represents the number of bytes in a row of
                                 the BltBuffer.

  @retval EFI_INVALID_PARAMETER  Invalid parameter passed in
  @retval EFI_SUCCESS            Blt operation success

**/
EFI_STATUS
EFIAPI
FbGopGraphicsOutputVbeBlt (
  IN  EFI_GRAPHICS_OUTPUT_PROTOCOL       *This,
  IN  EFI_GRAPHICS_OUTPUT_BLT_PIXEL      *BltBuffer, OPTIONAL
  IN  EFI_GRAPHICS_OUTPUT_BLT_OPERATION  BltOperation,
  IN  UINTN                              SourceX,
  IN  UINTN                              SourceY,
  IN  UINTN                              DestinationX,
  IN  UINTN                              DestinationY,
  IN  UINTN                              Width,
  IN  UINTN                              Height,
  IN  UINTN                              Delta
  )
{
  FB_VIDEO_DEV                 *FbGopPrivate;
  FB_VIDEO_MODE_DATA           *Mode;

  if (This == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  FbGopPrivate  = FB_VIDEO_DEV_FROM_GRAPHICS_OUTPUT_THIS (This);
  Mode          = &FbGopPrivate->ModeData[This->Mode->Mode];

  return FbGopVbeBltWorker (
           FbGopPrivate,
           BltBuffer,
           BltOperation,
           SourceX,
           SourceY,
           DestinationX,
           DestinationY,
           Width,
           Height,
           Delta,
           Mode
           );
}


/**
  The user Entry Point for module UefiFbGop. The user code starts with this function.

  @param[in] ImageHandle    The firmware allocated handle for the EFI image.
  @param[in] SystemTable    A pointer to the EFI System Table.

  @retval EFI_SUCCESS       The entry point is executed successfully.
  @retval other             Some error occurs when executing this entry point.

**/
EFI_STATUS
EFIAPI
FbGopEntryPoint(
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_STATUS  Status;
  EFI_HOB_GUID_TYPE  *GuidHob;
  
  //
  // Find the frame buffer information guid hob
  //
  GuidHob = GetFirstGuidHob (&gUefiFrameBufferInfoGuid);
  if (GuidHob != NULL) {   
    //
    // Install driver model protocol(s).
    //
    Status = EfiLibInstallDriverBindingComponentName2 (
               ImageHandle,
               SystemTable,
               &gFbGopDriverBinding,
               ImageHandle,
               &gFbGopComponentName,
               &gFbGopComponentName2
               );
    ASSERT_EFI_ERROR (Status);
  } else {
    DEBUG ((EFI_D_ERROR, "No FrameBuffer information from coreboot.  NO GOP driver !!!\n"));
    Status = EFI_ABORTED;
  }
  return Status;  
}