OvmfPkg: Add CsmSupportLib

This library installs the legacy interrupt, region
and platform support required for CSM support
drivers.

Signed-off-by: jljusten
Reviewed-by: geekboy15a

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12681 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/Csm/CsmSupportLib/CsmSupportLib.c

@@ -0,0 +1,38 @@
+/** @file
+  Platform CSM Support Library
+
+  Copyright (c) 2008 - 2011, 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 "CsmSupportLib.h"
+
+/**
+  The constructor function for the platform CSM support library
+
+  @retval EFI_SUCCESS   The constructor always returns RETURN_SUCCESS.
+
+**/
+RETURN_STATUS
+EFIAPI
+CsmSupportLibConstructor (
+  VOID
+  )
+{
+  LegacyRegionInit ();
+
+  LegacyInterruptInstall ();
+
+  LegacyBiosPlatformInstall ();
+
+  return EFI_SUCCESS;
+}
+