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INVD

Invalidates internal caches.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available in all modes of operation. It is a privileged instruction and SHALL only be executed in Ring 0; otherwise, it triggers a General Protection Fault (#GP).

The INVD instruction does not maintain cache coherency. It invalidates the cache without writing modified data back to main memory. Therefore, any modified data in the cache that has not been written back to memory will be lost. This instruction SHALL NOT be used in SMP (Symmetric Multiprocessing) environments as it does not broadcast the invalidation to other processors. For SMP environments, WBINVD SHALL be used instead.