A.5.143 LSL: Load Segment Limit
LSL reg16,r/m16 ; o16 0F 03 /r [286,PRIV]
LSL reg32,r/m32 ; o32 0F 03 /r [386,PRIV]
LSL is given a segment selector in its source (second) operand; it
computes the segment limit value by loading the segment limit field from
the associated segment descriptor in the GDT or LDT. (This involves
shifting left by 12 bits if the segment limit is page-granular, and not
if it is byte-granular; so you end up with a byte limit in either case.)
The segment limit obtained is then loaded into the destination (first)
operand.