CPUID

Operation

Queries architectural discovery information through a selected Rn register.

Assembler Syntax

CPUID Rn(r)

Privilege

Unprivileged

Queries architectural discovery information. The selected Rn register contains the CPUID query selector before execution and receives the selected 64-bit result after execution.

2.75in

Encodings

CPUID Rn(r)

Format: Instruction format for CPUID Rn(r)