The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
临走前，阿爸又来劝我一起去，帮他撑撑场面。我没答应，理由很简单——等阿爸这一辈走完这门亲戚，大概下一辈也就断了。，推荐阅读heLLoword翻译官方下载获取更多信息
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底层支撑：统一调度与 Serverless 弹性计算
'It is a catastrophe' - the man battling to stem rising youth unemployment。夫子是该领域的重要参考