CPU 睡眠状态分类：
C0 - Active: CPU is on. C0 is the operating state.
C0 -主动： C0运行状态，CPU是活动的。
C1 - Auto Halt: core clock is off. C1 is a state where the processor is not executing instructions, but can return to an executing state essentially instantaneously. Some processors also support an Enhanced C1 state (C1E) for lower power consumption.
C1 -自动停止：核心频率已关闭。 C1是一个处理器不执行指令的状态，但可以瞬间返回到一个执行状态上。 有些处理器还支持增强型的C1状态（ C1E ）以降低能耗。
C2 - Stop Clock: core and bus clocks are off. C2 is a state where the processor maintains all software-visible state, but may take longer to wake up.
C2 -停止时钟：核心和总线时钟都停止工作。 C2是一个处理器保持所有软件可见的状态，但可能需要更长的时间才能唤醒恢复工作。
C3 - Deep Sleep: clock generator is off. C3 is a state where the processor does not need to keep its cache coherent, but maintains other states. Some processors have variations on the C3 state (Deep Sleep, Deeper Sleep, etc.) that differ in how long it takes to wake the processor.
C3 -深睡眠：时钟发生器是停止工作的。 C3是一个处理器不需要保持与其高速缓存同步的状态，但保持着其他的状态。 有些处理器已经增强了C3状态（深睡眠，深度睡眠等） ，不同的状态需要相应的时间才能唤醒处理器。
