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AsmRelocateApLoop() is used to place APs into MWAIT-loop if MonitorMwait feature is supported before hand-off to OS, or place APs into HLT-loop if MonitorMwait feature is not supported. If the current mode is long mode, we will switch APs to protected mode before placing APs in MWAIT-loop or HLT-loop. Thus, once APs wakeup from loop, APs needn't the page table that may be crashed by OS. v3: 1. Rename AsmRellocateApLoop to AsmRelocateApLoop. 2. Fix typo Proteced to Protected. 3. Fix typo segement to segment 4. Use word MONITOR instead of mwait-monitor. Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Feng Tian <feng.tian@intel.com> Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> Tested-by: Laszlo Ersek <lersek@redhat.com> Tested-by: Michael Kinney <michael.d.kinney@intel.com>