RtlXRestoreS

VOID __fastcall RtlXRestoreS(_QWORD *a1, UINT64 a2){
  if( (KUSER_SHARED_DATA.XState.ControlFlags & 2) != 0 )
    XRestoreSHelper((INT64)a1, a2 & a1[65]);
  else
    RtlXRestore((XSAVE_AREA *)a1, a2);
}

Referenced by:

KeRestoreExtendedAndSupervisorState
KeRestoreSupervisorState
KxContextToKframes
PspSetContext