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CLUI

Clears the User-Level Interrupts (ULI) state. This instruction resets the internal state associated with user-level interrupt handling, effectively disabling the ability for the processor to receive user-level interrupts.

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

DO NOT support LOCK

This instruction is only available when the processor is operating in 64-bit mode. It is NOT supported in compatibility mode.

Failure to execute CLUI before transitioning to a lower privilege level or changing interrupt configurations may result in unexpected delivery of pending user-level interrupts. Ensure that the processor state is synchronized with the intended interrupt masking policy to avoid race conditions in interrupt handling.