// check the AUXV for the CPUID bit. The getMIDR function executes an
	// instruction which would normally be an illegal instruction, but it's
	// trapped by the kernel, the value sanitized and then returned.
	// Without the CPUID bit the kernel will not trap the instruction and the
	// process will be terminated with SIGILL.
	if ARM64.HasCPUID {
		midr := getMIDR()
		part_num := uint16((midr >> 4) & 0xfff)