OvmfPkg/QemuVideoDxe/UnalignedIoUnsupported.c

   1 /** @file
   2   Unaligned port I/O dummy implementation for platforms which do not support it.
   3
   4   Copyright (c) 2017, Phil Dennis-Jordan.<BR>
   5   This program and the accompanying materials are licensed and made available
   6   under the terms and conditions of the BSD License which accompanies this
   7   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 **/
  14
  15
  16 #include <Library/DebugLib.h>
  17 #include "UnalignedIoInternal.h"
  18
  19 /**
  20   Performs a 32-bit write to the specified, possibly unaligned I/O-type
  21   address.
  22
  23   Writes the 32-bit I/O port specified by Port with the value specified by
  24   Value and returns Value. This function must guarantee that all I/O read and
  25   write operations are serialized.
  26
  27   If 32-bit unaligned I/O port operations are not supported, then ASSERT().
  28
  29   @param[in]  Port   I/O port address
  30   @param[in]  Value  32-bit word to write
  31
  32   @return The value written to the I/O port.
  33
  34 **/
  35 UINT32
  36 UnalignedIoWrite32 (
  37   IN      UINTN                     Port,
  38   IN      UINT32                    Value
  39   )
  40 {
  41   ASSERT (FALSE);
  42   return Value;
  43 }
  44
  45 /**
  46   Reads a 32-bit word from the specified, possibly unaligned I/O-type address.
  47
  48   Reads the 32-bit I/O port specified by Port. The 32-bit read value is
  49   returned. This function must guarantee that all I/O read and write operations
  50   are serialized.
  51
  52   If 32-bit unaligned I/O port operations are not supported, then ASSERT().
  53
  54   @param[in]  Port  The I/O port to read.
  55
  56   @return The value read.
  57
  58 **/
  59 UINT32
  60 UnalignedIoRead32 (
  61   IN      UINTN                     Port
  62   )
  63 {
  64   ASSERT (FALSE);
  65   return 0;
  66 }