audk/MdePkg/Library/PciSegmentLibSegmentInfo/BasePciSegmentLib.c

/** @file
  Instance of Base PCI Segment Library that support multi-segment PCI configuration access.

  PCI Segment Library that consumes segment information provided by PciSegmentInfoLib to
   support multi-segment PCI configuration access through enhanced configuration access mechanism.

  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "PciSegmentLibCommon.h"

/**
  Return the virtual address for the physical address.

  @param  Address  The physical address.

  @retval The virtual address.
**/
UINTN
PciSegmentLibVirtualAddress (
  IN UINTN  Address
  )
{
  return Address;
}

/**
  Register a PCI device so PCI configuration registers may be accessed after
  SetVirtualAddressMap().

  If any reserved bits in Address are set, then ASSERT().

  @param  Address The address that encodes the PCI Bus, Device, Function and
                  Register.

  @retval RETURN_SUCCESS           The PCI device was registered for runtime access.
  @retval RETURN_UNSUPPORTED       An attempt was made to call this function
                                   after ExitBootServices().
  @retval RETURN_UNSUPPORTED       The resources required to access the PCI device
                                   at runtime could not be mapped.
  @retval RETURN_OUT_OF_RESOURCES  There are not enough resources available to
                                   complete the registration.

**/
RETURN_STATUS
EFIAPI
PciSegmentRegisterForRuntimeAccess (
  IN UINTN  Address
  )
{
  //
  // Use PciSegmentLibGetEcamAddress() to validate the Address.
  //
  DEBUG_CODE (
    UINTN                        Count;
    PCI_SEGMENT_INFO             *SegmentInfo;

    SegmentInfo = GetPciSegmentInfo (&Count);
    PciSegmentLibGetEcamAddress (Address, SegmentInfo, Count);
    );
  return RETURN_SUCCESS;
}