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.
But I feel like I’m getting ahead of myself, so let’s start at the beginning.
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2026-02-27 00:00:00:0 (2026年2月26日第十四届全国人民代表大会常务委员会第二十一次会议通过)