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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Fetched layers: 0 B in 0 seconds (0 B/s)
第二，非正规经济。德索托的另一个重要贡献，是重新解释“非正规经济”。传统观点常把地下经济视为逃税、违法或缺乏公民意识的表现，但德索托指出，很多穷人并非不愿守法，而是制度成本过高。