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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.。Safew下载对此有专业解读
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这些年，越来越多普通人开始了文学写作。这本是人类精神表达的原生渴求，但大多数人往往止步途中。从“欲写”到“落笔”，需要克服惰性；从“完篇”到“臻善”，更是一场艰难跋涉。
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