关于MMU和页表的一些概念

1.操作系统对存储器的所有操作都是虚拟地址，虚拟地址通过MMU来对外产生物理地址

2.每条TLB对应一个地址映射，不管一级还是二级页表，最后这里就是一个直接映射

3.从FPGA的设计观点很好理解，应该就是一个swich的组合逻辑，VPN相等就把PPN输出

4.新增几点，为什么使用多级页表的方式，目的只有一个，加快查询速度，理论计算多级页表可定花费的存页表的空间要大，但是类似二分法的查找效率更高。

5.MMU和cache都位于协处理器CP15内，其只与CPU相联系，指令MCR，MRC（从后向前看，R是cpu寄存器，C是协处理器），其中c2存放的是页表基址

6.整个查表过程硬件完成，但是页表由操作系统维护

7.每个进程会分配一个ASID号，这个号是进程相关的，并且被和虚拟地址一起作为TLB的索引，这样TLB就和进程相关了，如果是内核地址空间呢，别着急，可以参考一个全局的标志位来忽略ASID部分，这样就实现了共享。（索引=ASID+VPN）

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