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.
Salesforce CEO 反驳「软件末日」：都不是第一次这样讲了。业内人士推荐WPS下载最新地址作为进阶阅读
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▲ 图片来自小红书@奶茶喝无糖_
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Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10159-6