1 files changed, 78 insertions, 0 deletions
diff --git a/OvmfPkg/QemuVideoDxe/UnalignedIoMsc.c b/OvmfPkg/QemuVideoDxe/UnalignedIoMsc.c
new file mode 100644
index 0000000000..a466baee84
--- /dev/null
+++ b/OvmfPkg/QemuVideoDxe/UnalignedIoMsc.c
@@ -0,0 +1,78 @@
+/** @file
+  Unaligned port I/O. This file has compiler specifics for Microsoft C as there
+  is no ANSI C standard for doing IO.
+
+  Based on IoLibMsc.c
+
+  Copyright (c) 2006 - 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.
+
+**/
+
+
+#include "UnalignedIoInternal.h"
+
+unsigned long  _inpd (unsigned short port);
+unsigned long  _outpd (unsigned short port, unsigned long dataword );
+void          _ReadWriteBarrier (void);
+
+/**
+  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
+  )
+{
+  _ReadWriteBarrier ();
+  _outpd ((UINT16)Port, Value);
+  _ReadWriteBarrier ();
+  return 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
+  )
+{
+  UINT32                            Value;
+
+  _ReadWriteBarrier ();
+  Value = _inpd ((UINT16)Port);
+  _ReadWriteBarrier ();
+  return Value;
+}