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.
参考资料：[1]内存价格暴走，高盛下调全球手机销量预期，中低端先扛不住，华尔街见闻
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Платон Щукин (Редактор отдела «Экономика»)