1 files changed, 80 insertions, 0 deletions
diff --git a/OvmfPkg/QemuVideoDxe/UnalignedIoIcc.c b/OvmfPkg/QemuVideoDxe/UnalignedIoIcc.c
new file mode 100644
index 0000000000..79f3e446dd
--- /dev/null
+++ b/OvmfPkg/QemuVideoDxe/UnalignedIoIcc.c
@@ -0,0 +1,80 @@
+/** @file
+  Unaligned port I/O. This file has compiler specifics for ICC as there
+  is no ANSI C standard for doing IO.
+
+  Based on IoLibIcc.c.
+
+  Copyright (c) 2006 - 2008, 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"
+
+/**
+  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
+  )
+{
+  __asm {
+    mov eax, dword ptr [Value]
+    mov dx, word ptr [Port]
+    out dx, eax
+  }
+
+  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 Data;
+
+  __asm {
+    mov dx, word ptr [Port]
+    in  eax, dx
+    mov dword ptr [Data], eax
+  }
+
+  return Data;
+}