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针对Linux操作系统,实现了面向32位RSIC嵌入式处理器的低功耗存储器管理单元。通过在指令快表中增加预比较电路,提高了处理器连续访问同一虚拟页面时的地址转换效率,降低指令快表命中时的功耗37.07%。两级比较结构的内容寻址存储器与传统结构相比,在失效和命中时分别可以取得44.98%和74.94%的功耗节省。该文设计的存储器管理单元能够很好地和Linux配合,完成地址映射及存储权限管理。
For the Linux operating system, a low-power memory management unit for a 32-bit RSIC embedded processor is implemented. By adding a pre-comparison circuit to the instruction fast table, the address conversion efficiency when the processor accesses the same virtual page continuously is improved, and the power consumption when an instruction fast table hits is reduced by 37.07%. Compared with the traditional structure, the two-stage structure of content addressable memory can achieve power savings of 44.98% and 74.94% respectively in case of failure and hit. This article designs the memory management unit to work well with Linux to complete the address mapping and storage rights management.