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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.
。雷电模拟器官方版本下载是该领域的重要参考
Pakistan has bombed major cities in Afghanistan including the capital, Kabul, with Islamabad’s defence minister declaring that the hostile neighbours were in a state of “open war” as a cycle of retaliatory attacks escalated further.
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