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(nasm.info)Section B.4.143

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B.4.143. `LSL': Load Segment Limit
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     LSL reg16,r/m16               ; o16 0F 03 /r         [286,PRIV]
     LSL reg32,r/m32               ; o32 0F 03 /r         [286,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.