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.
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"countDelta": 140。业内人士推荐同城约会作为进阶阅读
5月13日,北京市第八十中学学生展示自己设计制作的仿生学设备。 新京报记者 王飞 摄
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