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RDPID

Reads the processor ID (PID) of the current logical processor into the destination operand.

The following table covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available only in 64-bit mode. It is NOT supported in compatibility mode or 32-bit protected mode.

The RDPID instruction is only available on processors that implement the PID feature. Attempting to execute this instruction on a processor that does not support it SHALL result in an invalid opcode exception (#UD). To avoid this, software MUST check the CPUID leaf for the presence of the RDPID bit before execution.