source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/OvmfPkg/QemuVideoDxe/UnalignedIoInternal.h@ 79205

/** @file
  Unaligned port I/O, with implementations for various x86 compilers and a
  dummy for platforms which do not support unaligned port I/O.

  Copyright (c) 2017, Phil Dennis-Jordan.<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 _UNALIGNED_IO_INTERNAL_H_
#define _UNALIGNED_IO_INTERNAL_H_

/**
  Performs a 32-bit write to the specified, possibly unaligned I/O-type address.

  Writes the 32-bit I/O port specified by Port with the value specified by Value
  and returns Value. This function must guarantee that all I/O read and write
  operations are serialized.

  If 32-bit unaligned I/O port operations are not supported, then ASSERT().

  @param[in]  Port   I/O port address
  @param[in]  Value  32-bit word to write

  @return The value written to the I/O port.

**/
UINT32
UnalignedIoWrite32 (
  IN      UINTN                     Port,
  IN      UINT32                    Value
  );

/**
  Reads a 32-bit word from the specified, possibly unaligned I/O-type address.

  Reads the 32-bit I/O port specified by Port. The 32-bit read value is
  returned. This function must guarantee that all I/O read and write operations
  are serialized.

  If 32-bit unaligned I/O port operations are not supported, then ASSERT().

  @param[in]  Port  The I/O port to read.

  @return The value read.

**/
UINT32
UnalignedIoRead32 (
  IN      UINTN                     Port
  );

#endif