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).
2026-02-27 00:00:00:03014246610http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142466.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142466.html11921 行政执法监督条例
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