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SENDUIPI

Sends an Unaddressed User-Level Interrupt (UIPI) to the local processor.

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

DO NOT support LOCK

The instruction is only supported on processors that implement User-Level Interrupts. It MUST be executed in CPL 3; execution at a higher privilege level SHALL result in an undefined operation or a general-protection exception (#GP), depending on the processor implementation.

The instruction does not take any operands. Attempting to specify a source or destination operand SHALL result in an invalid opcode exception. The target of the interrupt is always the local processor (self-IPI).