在所有的现代操作系统中，系统都是使用虚地址去访问内存单元的。
All modern operating systems, including Linux, use this kind of addresses to access the contents of memory cells.
MMU的功能是控制各种存储系统的工作并将虚地址转换成物理地址，以及控制存储器访问权限。
The functions of the MMU are to control the various memory systems, translate the virtual addresses into physical addresses and control the access permission.
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