MdePkg/Include/Protocol/PlatformDriverOverride.h

/** @file
  Platform Driver Override protocol as defined in the UEFI 2.1 specification.

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

**/

#ifndef __EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL_H__
#define __EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL_H__

///
/// Global ID for the Platform Driver Override Protocol
///
#define EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL_GUID \
  { \
    0x6b30c738, 0xa391, 0x11d4, {0x9a, 0x3b, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
  }

typedef struct _EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL;

//
// Prototypes for the Platform Driver Override Protocol
//

/**
  Retrieves the image handle of the platform override driver for a controller in the system.

  @param  This                  A pointer to the EFI_PLATFORM_DRIVER_OVERRIDE_
                                PROTOCOL instance.
  @param  ControllerHandle      The device handle of the controller to check if a driver override
                                exists.
  @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.

  @retval EFI_SUCCESS           The driver override for ControllerHandle was returned in
                                DriverImageHandle.
  @retval EFI_NOT_FOUND         A driver override for ControllerHandle was not found.
  @retval EFI_INVALID_PARAMETER The handle specified by ControllerHandle is NULL.
  @retval EFI_INVALID_PARAMETER DriverImageHandle is not a handle that was returned on a
                                previous call to GetDriver().

**/
typedef
EFI_STATUS
(EFIAPI *EFI_PLATFORM_DRIVER_OVERRIDE_GET_DRIVER)(
  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL              *This,
  IN     EFI_HANDLE                                     ControllerHandle,
  IN OUT EFI_HANDLE                                     *DriverImageHandle
  );

/**
  Retrieves the device path of the platform override driver for a controller in the system.

  @param  This                  A pointer to the EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL instance.
  @param  ControllerHandle      The device handle of the controller to check if a driver override
                                exists.
  @param  DriverImagePath       On input, a pointer to the previous driver device path returned by
                                GetDriverPath(). On output, a pointer to the next driver
                                device path. Passing in a pointer to NULL will return the first
                                driver device path for ControllerHandle.

  @retval EFI_SUCCESS           The driver override for ControllerHandle was returned in
                                DriverImageHandle.
  @retval EFI_UNSUPPORTED       The operation is not supported.
  @retval EFI_NOT_FOUND         A driver override for ControllerHandle was not found.
  @retval EFI_INVALID_PARAMETER The handle specified by ControllerHandle is NULL.
  @retval EFI_INVALID_PARAMETER DriverImagePath is not a device path that was returned on a
                                previous call to GetDriverPath().

**/
typedef
EFI_STATUS
(EFIAPI *EFI_PLATFORM_DRIVER_OVERRIDE_GET_DRIVER_PATH)(
  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL              *This,
  IN     EFI_HANDLE                                     ControllerHandle,
  IN OUT EFI_DEVICE_PATH_PROTOCOL                       **DriverImagePath
  );

/**
  Used to associate a driver image handle with a device path that was returned on a prior call to the
  GetDriverPath() service. This driver image handle will then be available through the
  GetDriver() service.

  @param  This                  A pointer to the EFI_PLATFORM_DRIVER_OVERRIDE_
                                PROTOCOL instance.
  @param  ControllerHandle      The device handle of the controller.
  @param  DriverImagePath       A pointer to the driver device path that was returned in a prior
                                call to GetDriverPath().
  @param  DriverImageHandle     The driver image handle that was returned by LoadImage()
                                when the driver specified by DriverImagePath was loaded
                                into memory.

  @retval EFI_SUCCESS           The association between DriverImagePath and
                                DriverImageHandle was established for the controller specified
                                by ControllerHandle.
  @retval EFI_UNSUPPORTED       The operation is not supported.
  @retval EFI_NOT_FOUND         DriverImagePath is not a device path that was returned on a prior
                                call to GetDriverPath() for the controller specified by
                                ControllerHandle.
  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
  @retval EFI_INVALID_PARAMETER DriverImagePath is not a valid device path.
  @retval EFI_INVALID_PARAMETER DriverImageHandle is not a valid image handle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_PLATFORM_DRIVER_OVERRIDE_DRIVER_LOADED)(
  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL          *This,
  IN EFI_HANDLE                                     ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL                       *DriverImagePath,
  IN EFI_HANDLE                                     DriverImageHandle
  );

///
/// This protocol matches one or more drivers to a controller. A platform driver
/// produces this protocol, and it is installed on a separate handle. This protocol
/// is used by the ConnectController() boot service to select the best driver
/// for a controller. All of the drivers returned by this protocol have a higher
/// precedence than drivers found from an EFI Bus Specific Driver Override Protocol
/// or drivers found from the general UEFI driver Binding search algorithm. If more
/// than one driver is returned by this protocol, then the drivers are returned in
/// order from highest precedence to lowest precedence.
///
struct _EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL {
  EFI_PLATFORM_DRIVER_OVERRIDE_GET_DRIVER         GetDriver;
  EFI_PLATFORM_DRIVER_OVERRIDE_GET_DRIVER_PATH    GetDriverPath;
  EFI_PLATFORM_DRIVER_OVERRIDE_DRIVER_LOADED      DriverLoaded;
};

extern EFI_GUID  gEfiPlatformDriverOverrideProtocolGuid;

#endif