audk/EdkCompatibilityPkg/Compatibility/Include/Ppi/EcpPciCfg.h

/** @file
This PPI is the same as the PPI in the framework PciCfg, with one exception. 
Specifically, this PPI does not include a modify API, while the PPI in the framework PciCfg does. 

Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

**/

#ifndef _PEI_PCI_CFG_H_
#define _PEI_PCI_CFG_H_

#include <Ppi/PciCfg.h>

#define ECP_PEI_PCI_CFG_PPI_GUID \
  {0xb0ee53d4, 0xa049, 0x4a79, { 0xb2, 0xff, 0x19, 0xd9, 0xfa, 0xef, 0xaa, 0x94}}

typedef struct _ECP_PEI_PCI_CFG_PPI ECP_PEI_PCI_CFG_PPI;

/**
  A PCI read and write operation.
  
  Writes to, or reads from, a given location in the PCI configuration space.

  @param  PeiServices              An indirect pointer to the PEI Services Table 
                                   published by the PEI Foundation.
  @param  This                     The pointer to local data for the interface.
  @param  Width                    The width of the access. Enumerated in bytes.
  @param  Address                  The physical address of the access. The format of
                                   the address is described by EFI_PEI_PCI_CFG_PPI_PCI_ADDRESS.
  @param  Buffer                   A pointer to the buffer of data.
  @retval EFI_SUCCESS              The function completed successfully.
  @retval EFI_DEVICE_ERROR         There was a problem with the transaction.
  @retval EFI_DEVICE_NOT_READY     The device is not capable of supporting the 
                                   operation at this time.
**/
typedef
EFI_STATUS
(EFIAPI *ECP_PEI_PCI_CFG_PPI_IO)(
  IN EFI_PEI_SERVICES         **PeiServices,
  IN EFI_PEI_PCI_CFG_PPI      * This,
  IN EFI_PEI_PCI_CFG_PPI_WIDTH Width,
  IN UINT64                   Address,
  IN OUT VOID                 *Buffer
  );

struct _ECP_PEI_PCI_CFG_PPI {
  ECP_PEI_PCI_CFG_PPI_IO  Read;
  ECP_PEI_PCI_CFG_PPI_IO  Write;
};

extern EFI_GUID gEcpPeiPciCfgPpiGuid;

#endif