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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2026-02-28 00:00:00:0杨林旭3014268810http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142688.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142688.html11921 考古新成果阐释中华文明突出特性(考古中国)
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