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(nasm.info)Section B.4.289

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B.4.289. `SGDT', `SIDT', `SLDT': Store Descriptor Table Pointers
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     SGDT mem                      ; 0F 01 /0             [286,PRIV]
     SIDT mem                      ; 0F 01 /1             [286,PRIV]
     SLDT r/m16                    ; 0F 00 /0             [286,PRIV]

   `SGDT' and `SIDT' both take a 6-byte memory area as an operand: they
store the contents of the GDTR (global descriptor table register) or
IDTR (interrupt descriptor table register) into that area as a 32-bit
linear address and a 16-bit size limit from that area (in that order).
These are the only instructions which directly use _linear_ addresses,
rather than segment/offset pairs.

   `SLDT' stores the segment selector corresponding to the LDT (local
descriptor table) into the given operand.

   See also `LGDT', `LIDT' and `LLDT' (*Note Section B.4.138::).