MdePkg/Include/Protocol/BusSpecificDriverOverride.h

/** @file
  Bus Specific Driver Override protocol as defined in the UEFI 2.0 specification.

  Bus drivers that have a bus specific algorithm for matching drivers to controllers are
  required to produce this protocol for each controller. For example, a PCI Bus Driver will produce an
  instance of this protocol for every PCI controller that has a PCI option ROM that contains one or
  more UEFI drivers. The protocol instance is attached to the handle of the PCI controller.

  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL_H_
#define _EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL_H_

///
/// Global ID for the Bus Specific Driver Override Protocol
///
#define EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL_GUID \
  { \
    0x3bc1b285, 0x8a15, 0x4a82, {0xaa, 0xbf, 0x4d, 0x7d, 0x13, 0xfb, 0x32, 0x65 } \
  }

typedef struct _EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL  EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL;

//
// Prototypes for the Bus Specific Driver Override Protocol
//

/**
  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().

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

///
/// This protocol matches one or more drivers to a controller. This protocol is produced by a bus driver,
/// and it is installed on the child handles of buses that require a bus specific algorithm for matching
/// drivers to controllers.
///
struct _EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_PROTOCOL {
  EFI_BUS_SPECIFIC_DRIVER_OVERRIDE_GET_DRIVER GetDriver;
};

extern EFI_GUID gEfiBusSpecificDriverOverrideProtocolGuid;

#endif