MdePkg/Library/BaseIoLibIntrinsic/IoLib.c

   1 /** @file
   2   Common I/O Library routines.
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13   Module Name:  IoLib.c
  14
  15 **/
  16
  17 /**
  18   Reads a 64-bit I/O port.
  19
  20   Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
  21   This function must guarantee that all I/O read and write operations are
  22   serialized.
  23
  24   If 64-bit I/O port operations are not supported, then ASSERT().
  25
  26   @param  Port  The I/O port to read.
  27
  28   @return The value read.
  29
  30 **/
  31 UINT64
  32 EFIAPI
  33 IoRead64 (
  34   IN      UINTN                     Port
  35   )
  36 {
  37   ASSERT (FALSE);
  38   return 0;
  39 }
  40
  41 /**
  42   Writes a 64-bit I/O port.
  43
  44   Writes the 64-bit I/O port specified by Port with the value specified by Value
  45   and returns Value. This function must guarantee that all I/O read and write
  46   operations are serialized.
  47
  48   If 64-bit I/O port operations are not supported, then ASSERT().
  49
  50   @param  Port  The I/O port to write.
  51   @param  Value The value to write to the I/O port.
  52
  53   @return The value written the I/O port.
  54
  55 **/
  56 UINT64
  57 EFIAPI
  58 IoWrite64 (
  59   IN      UINTN                     Port,
  60   IN      UINT64                    Value
  61   )
  62 {
  63   ASSERT (FALSE);
  64   return 0;
  65 }
  66