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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).
。safew官方版本下载对此有专业解读
但它好就好在这是一个高度集成的软硬件结合功能，你可以把它设置成按条件触发，不用像防窥膜那样偶尔撕掉一次还得重新买。
Also: I found the best Linux server distros for your home lab