INVLPG - Invalidate Translation Look-Aside Buffer Entry (486+)

        Usage:  INVLPG
        Modifies flags: none

        Invalidates a single page table entry in the Translation
        Look-Aside Buffer.  Intel warns that this instruction may be
        implemented differently on future processors.
                                  Clocks                Size
        Operands         808x   286   386   486         Bytes

        none              -      -     -     12           2

        - timing is for TLB entry hit only.

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