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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Jack Horner, who was a consultant for the Jurassic Park films, is among the researchers whose work or careers have been affected because of revelations from newly released documents.。同城约会是该领域的重要参考
这样的趋势会领向什么样的终极形态，目前行业还在探索之中，苹果当然不希望自己掉队。
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