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(nasm.info)Section B.4.134

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B.4.134. `LDS', `LES', `LFS', `LGS', `LSS': Load Far Pointer
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     LDS reg16,mem                 ; o16 C5 /r            [8086]
     LDS reg32,mem                 ; o32 C5 /r            [386]

     LES reg16,mem                 ; o16 C4 /r            [8086]
     LES reg32,mem                 ; o32 C4 /r            [386]

     LFS reg16,mem                 ; o16 0F B4 /r         [386]
     LFS reg32,mem                 ; o32 0F B4 /r         [386]

     LGS reg16,mem                 ; o16 0F B5 /r         [386]
     LGS reg32,mem                 ; o32 0F B5 /r         [386]

     LSS reg16,mem                 ; o16 0F B2 /r         [386]
     LSS reg32,mem                 ; o32 0F B2 /r         [386]

   These instructions load an entire far pointer (16 or 32 bits of
offset, plus 16 bits of segment) out of memory in one go. `LDS', for
example, loads 16 or 32 bits from the given memory address into the
given register (depending on the size of the register), then loads the
_next_ 16 bits from memory into `DS'. `LES', `LFS', `LGS' and `LSS'
work in the same way but use the other segment registers.