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(nasm.info)Section B.4.328

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B.4.328. `WBINVD': Write Back and Invalidate Cache
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     WBINVD                        ; 0F 09                [486]

   `WBINVD' invalidates and empties the processor's internal caches, and
causes the processor to instruct external caches to do the same. It
writes the contents of the caches back to memory first, so no data is
lost. To flush the caches quickly without bothering to write the data
back first, use `INVD' (*Note Section B.4.125::).