// See ARMv7 manual section B1.6.
	// We also need at least a v7 chip, for the DMB instruction.
	ARM.HasV7Atomics = isSet(HWCap, hwcap_LPAE) && isV7(Platform)
}

func isSet(hwc uint, value uint) bool {
	return hwc&value != 0
}

func isV7(s string) bool {
	if s == "aarch64" {
		return true
	}
	return s >= "v7" // will be something like v5, v7, v8, v8l