Porting 'KAIMON' embedded operating system to the MIPS processor architecture

摘要

In recent years, as softwares are more complex and larger scales in embedded systems, they are demanded to be portable. But many kinds of processors are used in enbedded sysutems and it causes to lost portability of embedded operating systems. In this paper, Porting "Kaimon" to the MIPS processor and considering how to improve portability of embedded OS and its aplications. "Kaimon" is composed of 3 parts which are task management, interrupt management and systemcalls. In task management, TCB parameters and securing stack managements were need to exchange. Managing MIPS interrupt by InterruptVectorTable made easy of selecting the paformance trade-off. A result of porting to MIPS processor, systemcalls of interrupt managements depend on CPU. But systemcalls of task management are indipendent of CPU. 59.6% of source code is depend on CPU and 40.4% is independent of CPU. And 42.0% of a part of depending on CPU is written in assembly language.