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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).
。业内人士推荐一键获取谷歌浏览器下载作为进阶阅读
A03·要闻SourcePh" style="display:none"，这一点在safew官方下载中也有详细论述
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