/** @file
  Functions declaration for Bus Specific Driver Override protoocl.

Copyright (c) 2006 - 2017, 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.

**/


#ifndef _EFI_PCI_DRIVER_OVERRRIDE_H_
#define _EFI_PCI_DRIVER_OVERRRIDE_H_

#define DRIVER_OVERRIDE_SIGNATURE SIGNATURE_32 ('d', 'r', 'o', 'v')

//
// PCI driver override driver image list
//
typedef struct {
  UINT32                   Signature;
  LIST_ENTRY               Link;
  EFI_HANDLE               DriverImageHandle;
  EFI_DEVICE_PATH_PROTOCOL *DriverImagePath;
} PCI_DRIVER_OVERRIDE_LIST;


#define DRIVER_OVERRIDE_FROM_LINK(a) \
  CR (a, PCI_DRIVER_OVERRIDE_LIST, Link, DRIVER_OVERRIDE_SIGNATURE)

/**
  Initializes a PCI Driver Override Instance.

  @param  PciIoDevice   PCI Device instance.

**/
VOID
InitializePciDriverOverrideInstance (
  IN OUT PCI_IO_DEVICE          *PciIoDevice
  );

/**
  Add an overriding driver image.

  @param PciIoDevice        Instance of PciIo device.
  @param DriverImageHandle  Image handle of newly added driver image.
  @param DriverImagePath    Device path of newly added driver image.

  @retval EFI_SUCCESS          Successfully added driver.
  @retval EFI_OUT_OF_RESOURCES No memory resource for new driver instance.
  @retval other                Some error occurred when locating gEfiLoadedImageProtocolGuid.

**/
EFI_STATUS
AddDriver (
  IN PCI_IO_DEVICE            *PciIoDevice,
  IN EFI_HANDLE               DriverImageHandle,
  IN EFI_DEVICE_PATH_PROTOCOL *DriverImagePath
  );


/**
  Uses a bus specific algorithm to retrieve a driver image handle for a controller.

  @param  This                  A pointer to the EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL instance.
  @param  DriverImageHandle     On input, a pointer to the previous driver image handle returned
                                by GetDriver(). On output, a pointer to the next driver
                                image handle. Passing in a NULL, will return the first driver
                                image handle.

  @retval EFI_SUCCESS           A bus specific override driver is returned in DriverImageHandle.
  @retval EFI_NOT_FOUND         The end of the list of override drivers was reached.
                                A bus specific override driver is not returned in DriverImageHandle.
  @retval EFI_INVALID_PARAMETER DriverImageHandle is not a handle that was returned on a
                                previous call to GetDriver().

**/
EFI_STATUS
EFIAPI
GetDriver (
  IN EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL              *This,
  IN OUT EFI_HANDLE                                         *DriverImageHandle
  );

#endif
