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.
2026-02-27 00:00:00:03014251110http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142511.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142511.html11921 十四届全国人大常委会第二十一次会议分组审议全国人大常委会工作报告稿
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