关键词: 可信执行环境, 双核SoC, RISCV, PMP, IOPMP, Mailbox

Abstract: With the rapid development of Internet of Things (IoT) technology, resourceconstrained embedded IoT devices face particularly severe challenges in information security. The Trusted Execution Environment (TEE) provides an effective approach to addressing the security issues of terminal devices. By dividing the system into secure and ordinary areas and employing mechanisms such as memory access control, TEE ensures the separate execution of secure and ordinary application software, thereby significantly enhancing the overall system security. This paper addresses the problem of trusted isolation of secure application software and proposes a lightweight TEE SystemonChip (SoC) solution based on a RISCV dualcore architecture. Specifically, the solution leverages the Physical Memory Protection (PMP) mechanism to achieve trusted isolation. Additionally, to prevent unauthorized access to secure area resources by ordinary area applications, a lowresource IOPMP design is presented, which uses a physical address access firewall mechanism to block unauthorized access. Furthermore, to facilitate efficient message transfer between the secure and ordinary areas, a Mailbox communication scheme based on the “message queue & interrupt” mechanism is proposed. Experimental results indicate that the design proposed in this paper has lower hardware resource consumption compared to similar designs, with a power consumption of only 0.256W, a 14% reduction. In the CoreMark test for the TEE CPU, the score reached 2.40 CoreMarks/MHz, which is double the performance of similar designs.

Key words: trusted execution environment, dualcore SoC, RISCV, PMP, IOPMP, Mailbox