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The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.
，这一点在91视频中也有详细论述
人民警察的回避，由其所属的公安机关决定；公安机关负责人的回避，由上一级公安机关决定。，更多细节参见爱思助手下载最新版本
function mockToString(target, name) {