OvmfPkg: introduce empty PlatformDxe

This DXE driver will load/save persistent values for OVMF's config knobs,
plus expose those knobs via HII.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15364 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/PlatformDxe/Platform.c

@@ -0,0 +1,53 @@
+/** @file
+  This driver effectuates OVMF's platform configuration settings and exposes
+  them via HII.
+
+  Copyright (C) 2014, Red Hat, Inc.
+  Copyright (c) 2009 - 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 <Library/DebugLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+/**
+  Entry point for this driver.
+
+  @param[in] ImageHandle  Image handle of this driver.
+  @param[in] SystemTable  Pointer to SystemTable.
+
+  @retval EFI_SUCESS            Driver has loaded successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+PlatformInit (
+  IN  EFI_HANDLE        ImageHandle,
+  IN  EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  return EFI_SUCCESS;
+}
+
+/**
+  Unload the driver.
+
+  @param[in]  ImageHandle  Handle that identifies the image to evict.
+
+  @retval EFI_SUCCESS  The image has been unloaded.
+**/
+EFI_STATUS
+EFIAPI
+PlatformUnload (
+  IN  EFI_HANDLE  ImageHandle
+  )
+{
+  return EFI_SUCCESS;
+}