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MOVDIR64B moves 64-bytes as direct-store with 64-bytes write atomicity. Direct store is implemented by using write combining (WC) for writing data directly into memory without caching the data. The bit definition: CPUID.(EAX=7,ECX=0):ECX[bit 28] MOVDIR64B The release document ref below link: https://software.intel.com/sites/default/files/managed/c5/15/\ architecture-instruction-set-extensions-programming-reference.pdf Cc: Xu Tao <tao3.xu@intel.com> Signed-off-by: Liu Jingqi <jingqi.liu@intel.com> Message-Id: <1541488407-17045-3-git-send-email-jingqi.liu@intel.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>