Let's talk performance. With C and D we have two places where we can use different implementations that influence performance for DisplayManager objects, or better access. But you might not always have the full freedom to pick all the options.
12:12, 9 марта 2026Мир，详情可参考新收录的资料
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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).