关键词：计算机体系结构；效率；嵌入式系统；现场可编程门阵列
摘 要：Mixed-criticality systems, in which multiple tasks of varying criticality are executed on a single hardware platform, are an emerging research area in real-time embedded systems. High-criticality tasks require spatial and temporal isolation guarantees, whereas low-criticality tasks should efficiently utilize hardware resources. Hardware-based isolation is desirable, but commonly underutilizes hardware resources, which can consist of multiple single-core, multicore, or multithreaded processors. We present FlexPRET, a processor designed specifically for mixed-criticality systems by allowing each task to make a trade-off between hardware-based isolation and efficient processor utilization. Flex-PRET uses fine-grained multithreading with flexible scheduling and timing instructions to provide this functionality.