/** @file
  Header file of OVMF instance of PciHostBridgeLib.

  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>

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

**/

PCI_ROOT_BRIDGE *
ScanForRootBridges (
  UINTN      *NumberOfRootBridges
);

/**
  Initialize a PCI_ROOT_BRIDGE structure.

  @param[in]  Supports         Supported attributes.

  @param[in]  Attributes       Initial attributes.

  @param[in]  AllocAttributes  Allocation attributes.

  @param[in]  RootBusNumber    The bus number to store in RootBus.

  @param[in]  MaxSubBusNumber  The inclusive maximum bus number that can be
                               assigned to any subordinate bus found behind any
                               PCI bridge hanging off this root bus.

                               The caller is repsonsible for ensuring that
                               RootBusNumber <= MaxSubBusNumber. If
                               RootBusNumber equals MaxSubBusNumber, then the
                               root bus has no room for subordinate buses.

  @param[in]  Io               IO aperture.

  @param[in]  Mem              MMIO aperture.

  @param[in]  MemAbove4G       MMIO aperture above 4G.

  @param[in]  PMem             Prefetchable MMIO aperture.

  @param[in]  PMemAbove4G      Prefetchable MMIO aperture above 4G.

  @param[out] RootBus          The PCI_ROOT_BRIDGE structure (allocated by the
                               caller) that should be filled in by this
                               function.

  @retval EFI_SUCCESS           Initialization successful. A device path
                                consisting of an ACPI device path node, with
                                UID = RootBusNumber, has been allocated and
                                linked into RootBus.

  @retval EFI_OUT_OF_RESOURCES  Memory allocation failed.
**/
EFI_STATUS
InitRootBridge (
  IN  UINT64                   Supports,
  IN  UINT64                   Attributes,
  IN  UINT64                   AllocAttributes,
  IN  UINT8                    RootBusNumber,
  IN  UINT8                    MaxSubBusNumber,
  IN  PCI_ROOT_BRIDGE_APERTURE *Io,
  IN  PCI_ROOT_BRIDGE_APERTURE *Mem,
  IN  PCI_ROOT_BRIDGE_APERTURE *MemAbove4G,
  IN  PCI_ROOT_BRIDGE_APERTURE *PMem,
  IN  PCI_ROOT_BRIDGE_APERTURE *PMemAbove4G,
  OUT PCI_ROOT_BRIDGE          *RootBus
  );