OvmfPkg/PlatformPei: Add mXen boolean to indicate Xen is running

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15201 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/PlatformPei/Xen.c

@@ -1,7 +1,7 @@
 /**@file
   Xen Platform PEI support
 
-  Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
   Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
 
   This program and the accompanying materials
@@ -31,6 +31,8 @@
 #include "Platform.h"
 #include "Xen.h"
 
+BOOLEAN mXen = FALSE;
+
 EFI_XEN_INFO mXenInfo;
 
 /**
@@ -131,6 +133,7 @@ XenDetect (
     Signature[12] = '\0';
 
     if (!AsciiStrCmp ((CHAR8 *) Signature, "XenVMMXenVMM")) {
+      mXen = TRUE;
       return XenLeaf;
     }
   }