/** @file
  PCI Rom supporting functions declaration for PCI Bus module.

Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _EFI_PCI_OPTION_ROM_SUPPORT_H_
#define _EFI_PCI_OPTION_ROM_SUPPORT_H_


/**
  Initialize a PCI LoadFile2 instance.

  @param PciIoDevice   PCI IO Device.

**/
VOID
InitializePciLoadFile2 (
  IN PCI_IO_DEVICE       *PciIoDevice
  );

/**
  Causes the driver to load a specified file.

  @param This        Indicates a pointer to the calling context.
  @param FilePath    The device specific path of the file to load.
  @param BootPolicy  Should always be FALSE.
  @param BufferSize  On input the size of Buffer in bytes. On output with a return
                     code of EFI_SUCCESS, the amount of data transferred to Buffer.
                     On output with a return code of EFI_BUFFER_TOO_SMALL,
                     the size of Buffer required to retrieve the requested file.
  @param Buffer      The memory buffer to transfer the file to. If Buffer is NULL,
                     then no the size of the requested file is returned in BufferSize.

  @retval EFI_SUCCESS           The file was loaded.
  @retval EFI_UNSUPPORTED       BootPolicy is TRUE.
  @retval EFI_INVALID_PARAMETER FilePath is not a valid device path, or
                                BufferSize is NULL.
  @retval EFI_NOT_FOUND         Not found PCI Option Rom on PCI device.
  @retval EFI_DEVICE_ERROR      Failed to decompress PCI Option Rom image.
  @retval EFI_BUFFER_TOO_SMALL  The BufferSize is too small to read the current directory entry.
                                BufferSize has been updated with the size needed to complete the request.

**/
EFI_STATUS
EFIAPI
LoadFile2 (
  IN EFI_LOAD_FILE2_PROTOCOL  *This,
  IN EFI_DEVICE_PATH_PROTOCOL *FilePath,
  IN BOOLEAN                  BootPolicy,
  IN OUT UINTN                *BufferSize,
  IN VOID                     *Buffer      OPTIONAL
  );

/**
  Check if the RomImage contains EFI Images.

  @param  RomImage  The ROM address of Image for check.
  @param  RomSize   Size of ROM for check.

  @retval TRUE     ROM contain EFI Image.
  @retval FALSE    ROM not contain EFI Image.

**/
BOOLEAN
ContainEfiImage (
  IN VOID            *RomImage,
  IN UINT64          RomSize
  );

/**
  Get Pci device's oprom information.

  @param PciIoDevice    Input Pci device instance.
                        Output Pci device instance with updated OptionRom size.

  @retval EFI_NOT_FOUND Pci device has not Option Rom.
  @retval EFI_SUCCESS   Pci device has Option Rom.

**/
EFI_STATUS
GetOpRomInfo (
  IN OUT PCI_IO_DEVICE    *PciIoDevice
  );

/**
  Load Option Rom image for specified PCI device.

  @param PciDevice Pci device instance.
  @param RomBase   Base address of Option Rom.

  @retval EFI_OUT_OF_RESOURCES No enough memory to hold image.
  @retval EFI_SUCESS           Successfully loaded Option Rom.

**/
EFI_STATUS
LoadOpRomImage (
  IN PCI_IO_DEVICE   *PciDevice,
  IN UINT64          RomBase
  );

/**
  Enable/Disable Option Rom decode.

  @param PciDevice    Pci device instance.
  @param RomBarIndex  The BAR index of the standard PCI Configuration header to use as the
                      base address for resource range. The legal range for this field is 0..5.
  @param RomBar       Base address of Option Rom.
  @param Enable       Flag for enable/disable decode.

**/
VOID
RomDecode (
  IN PCI_IO_DEVICE   *PciDevice,
  IN UINT8           RomBarIndex,
  IN UINT32          RomBar,
  IN BOOLEAN         Enable
  );

/**
  Load and start the Option Rom image.

  @param PciDevice       Pci device instance.

  @retval EFI_SUCCESS    Successfully loaded and started PCI Option Rom image.
  @retval EFI_NOT_FOUND  Failed to process PCI Option Rom image.

**/
EFI_STATUS
ProcessOpRomImage (
  IN PCI_IO_DEVICE   *PciDevice
  );

#endif
