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).
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Sound: Bang & Olufsen surround sound (4 speakers)
2024年12月23日 星期一 新京报。同城约会对此有专业解读