微内核结构嵌入式实时操作系统的研究与设计

Study and Design of Embedded Real-time Microkernel Operating System

分析了微内核结构在设计嵌入式实时操作系统时的优点,设计了一个微内核结构的嵌入式实时操作系统,整个系统内核由任务管理、任务通信、时钟管理、中断管理、内存管理等模块组成.内核采用抢占式调度和分时调度相结合的调度策略,以及基于查表法的优先级队列管理,使得系统在进行任务调度时能快速的找到所要调度的任务,满足实时性的要求.内核提供多种通信方式,并对控制临界资源访问的信号量进行了特别的设计,便于任务在必要的时候进行优先级继承,很好地解决了抢占式嵌入式操作系统中普遍存在的优先级反转问题.最后,在基于ARM处理器的EL-ARM-830硬件平台,给出了系统的实现.

The thesis analyzes the advantage of the structure of micro-kernel when designing the embedded real-time operating syster~ An embedded real-time operating system for micro-kernel structureis designed. The kernel of the system is made up of the task manager, task communication, clock management, interrupt management, memory management and other modules. The core uses the combination of preemptive scheduling and time-sharing scheduling strategy, and priority-based look-up table queue management. It makes the system find the tasks quickly when dipatching them which meets the real-time requirements. The kernel provides a variety of communication, and designes a special control access to critical resources which makes it easy to take priority over other tasks when necessary. It proposes a good solution to the common problem of inversion of embedded operating systems preemptive priority. Finally, the thesis gives the system implementation on the ARM-based processor EL-ARM-830 hardware platform.