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REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1614 To avoid the TOCTOU, enable paging and set Not Present flag so when access any code in the flash range, it will trigger #PF exception. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Signed-off-by: Guomin Jiang <guomin.jiang@intel.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>