UINT64 __stdcall KiMaskToLength(UINT64 Mask){
CCHAR LeastSignificantBit;
if( Mask )
LeastSignificantBit = RtlFindLeastSignificantBit(Mask);
else
LeastSignificantBit = *(_BYTE *)KiMtrrMaxRangeShift;
return 1i64 << LeastSignificantBit;
}