Real-time interrupt processing method for Linux system

Abstract

The invention relates to a real-time interrupt processing method for a Linux system. The method comprises the following steps of assigning FPGA (field programmable gate array) external interruption related to business as hardware interruption, and adopting other interruption of the Linux system as software interruption; changing an actuation environment of a software interruption processing program from an interruption context to a progress context, and defining the actuation environment of a hardware interruption processing program as the interruption context; changing other user space process except the user space business program in the Linux system to a non-real-time process, changing the corresponding process of the user space business program and the corresponding process of the software interruption processing program to real-time processes, wherein the real-time process is prior to the non-real-time process; in the real-time process, the corresponding process of the user space business program is prior to the corresponding process of the software interruption processing program. Due to the adoption of the method, the interrupt delay and business delay problems can be solved, the scheduling delay problem is solved through an infinite loop method and a space scheduling method, and the real-time property of the Linux system which is used as an embedded operating system can be improved.

Description

technical field [0001] The invention relates to the technical field of embedded operating systems, in particular to a real-time method for embedded operating systems. Background technique [0002] In the field of embedded real-time operating systems, Wind River's vxworks system has always occupied a leading position and occupied most of the market share. Although the Vxworks system has good real-time performance, because it is a commercial operating system, the authorization fee is high. [0003] The Linux operating system is free and open source, and has gained a lot of applications, especially in the server, computer network, data communication, cloud computing and other non-real-time fields. There are countless examples of successful applications. [0004] Real-time technology is divided into two fields: hard real-time and soft real-time. For example, wireless communication and data machine tool industry do not require very high real-time performance, and the accuracy of...

AI Technical Summary

Problems solved by technology

If when the FPGA (Field Programmable Gate Array) interrupt arrives, the CPU is processing other interrupts, such as network, keyboard, USB, disk and other interrupts, resulting in delayed or even lost interrupt response, this problem is "interrupt delay"

[0007]2. In Linux, the priority of the interrupt is higher than that of any program. When the interrupt is completed, the CPU control will return to the previously interrupted program. Continue to execute the previously interrupted program, unable to run the scheduler, and thus unable to run the required real-time program, this problem is "scheduling delay"

[0008]3. When the Linux scheduler schedules tasks, it treats all tasks equally, so even after 1 and 2 are resolved, there is still no guarantee that the scheduler will choose The program is the required real-time task handler, this problem is "task delay"