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Experimental Software Systems: Hardware-Software Co-Design of an Experimental Real-Time Operating System and a Microcontroller Architecture

实验软件系统：实验实时操作系统和微控制器架构的软硬件协同设计

基本信息

批准号：
9806645
负责人：
David Stewart
金额：
$ 28万
依托单位：
University of Maryland, College Park
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-09-01 至 2000-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806645&HistoricalAwards=false
关键词：
Experimental Software Systems Hardware Co

项目摘要

9806645 Stewart, David B. Jacob, Bruce L. University of Maryland, College Park Experimental Software Systems: Hardware-Software Co-Design of an Experimental Real-Time Operating System and Microcontroller Architecture A hardware-software co-design strategy is being used to create an environment for real-time embedded systems, comprising a real-time operating system (RTOS) for microcontrollers, and a set of hardware mechanisms that enhance a microarchitecture's real-time capabilities. The project validates this experimental system through extensive testing on a simulated processor, and measures the cost-effectiveness of the hardware architecture extensions over a wide range of design choices. The central contribution on the hardware side is the addition of multiple "nanoprocessors" and software-managed caches to the main processor core; each of these is a software-configurable finite state machine (FSM) with limited processing capabilities, but each has access to most of the processor state. These hardware mechanisms are orthogonal to the underlying microarchitecture and can be implemented inexpensively even in a low-cost microcontroller. The RTOS implements all of its high-overhead operating system functions as FSMs that are mapped onto the configurable hardware. Each of the nanoprocessors becomes a personal assistant to the operating system, performing mundane tasks such as prioritizing interrupts, filtering input/output, or acting as high-resolution timers. This leaves the full 100% of CPU processing time on the main processor core for applications.

9806645斯图尔特，大卫B。布鲁斯·雅各布马里兰州大学帕克分校实验软件系统：一种实验性实时操作系统和微控制器体系结构的软硬件协同设计一种硬件-软件协同设计策略正被用于创建实时嵌入式系统的环境，包括用于微控制器的实时操作系统（RTOS）和一组增强微体系结构的实时能力的硬件机制。该项目通过在模拟处理器上进行广泛的测试来验证这个实验系统，并在广泛的设计选择范围内测量硬件架构扩展的成本效益。硬件方面的主要贡献是在主处理器内核中增加了多个“纳米处理器”和软件管理的缓存;每个缓存都是一个软件可配置的有限状态机（FSM），处理能力有限，但每个都可以访问大多数处理器状态。这些硬件机制与底层微架构正交，即使在低成本微控制器中也可以廉价地实现。RTOS实现了其所有高开销操作系统作为映射到可配置硬件上的FSM运行。每一个纳米处理器都成为操作系统的个人助理，执行诸如优先处理中断、过滤输入/输出或充当高分辨率定时器等日常任务。这就留下了完整的 100%的CPU处理时间在主处理器核心上用于应用程序。