Nt32Pkg: Add Secure Boot build option including Custom Mode setup

If –D SECURE_BOOT_ENABLE is specified with the build command, Secure Boot support is enabled including custom mode setup.
This allows Secure Boot to be configured through setup allowing Nt32Pkg to be a fully functional Secure Boot reference platforms.

Signed-off-by: lee.g.rosenbaum@intel.com
Reviewed-by:  jiewen.yao@intel.com

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13186 6f19259b-4bc3-4df7-8a09-765794883524

Nt32Pkg/Library/PlatformSecureLib/PlatformSecureLib.c

@@ -0,0 +1,41 @@
+/** @file
+  Provides a platform-specific method to enable Secure Boot Custom Mode setup.
+
+  Copyright (c) 2006 - 2012, 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/PcdLib.h>
+
+
+/**
+
+  This function provides a platform-specific method to detect whether the platform
+  is operating by a physically present user. 
+
+  Programmatic changing of platform security policy (such as disable Secure Boot,
+  or switch between Standard/Custom Secure Boot mode) MUST NOT be possible during
+  Boot Services or after exiting EFI Boot Services. Only a physically present user
+  is allowed to perform these operations.
+
+  NOTE THAT: This function cannot depend on any EFI Variable Service since they are
+  not available when this function is called in AuthenticateVariable driver.
+  
+  @retval  TRUE       The platform is operated by a physically present user.
+  @retval  FALSE      The platform is NOT operated by a physically present user.
+
+**/
+BOOLEAN
+EFIAPI
+UserPhysicalPresent (
+  VOID
+  )
+{
+  return TRUE;
+}