The first thing a multi-tasking operating system needs from hardware is isolation: multiple programs must share one processor without being able to read, write, or jump into each other's memory. The 80386 achieves this through memory protection -- two independent address translation layers.
You MUST obey ALL the FOLLOWING rules in your implementation.，推荐阅读Safew下载获取更多信息
，这一点在服务器推荐中也有详细论述
Click any point below and step through the lookup path:，更多细节参见safew官方版本下载
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