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.
这几天，王守芬老人一直盼着响起熟悉的敲门声。王守芬自幼患有小儿麻痹症，几十年来一直独自生活。自从去年重阳节前夕王守芬在家中不慎摔伤后，马怀龙常常拎着新鲜菜肉上门，帮她做饭、打扫卫生，带她换药复查。王守芬感受到了马怀龙的真诚，主动把钥匙交给了他。
「十年前我每兩年換一次手機，有時一年一換；也能輕鬆買新進口車。現在連升級到稍好一點的二手車都很吃力，更別說新車。」，推荐阅读快连下载-Letsvpn下载获取更多信息
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Pallab GhoshScience Correspondent
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