Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10194-3
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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).，更多细节参见safew官方下载
Author(s): W. Dednam, E.B. Lombardi, Linda A. Zotti, C. Sabater