Comments (3)
eason-777
commented on May 18, 2024
我总把分页和虚拟内存绑在一起想，我的理解是“开启分页之后，虚拟内存也自动开启了”，不知道这种想法对不对。
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eason-777
commented on May 18, 2024
破案了。“能直接用线性地址0x90000当作物理地址”的原因在“第9回”中解释了，因为linux0.11假设了内存空间只有16M，页目录表中4项，每张页表1024项，就能表达4 * 1024 * 1024 * (4 * 1024)=16M，恰好能使得线性地址和物理地址是一一对应的关系。
至于分页是否和虚拟内存总是绑定在一起，我认为答案是肯定的，因为分页就是为了突破物理内存的限制而产生，也就是说是为virtual memory而产生。虽然在此处可以忽略虚拟内存，因为分页之后的线性空间和物理空间大小一致了。
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eason-777
commented on May 18, 2024
btw, 第9回中，“15M线性地址转换成物理地址”的例图应该是出错了，是13M。
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