A method for protecting the memory occupied by a real-time operating system under a multi-system

Abstract

The invention discloses a protection method of used internal memory of a real-time operating system (RTOS) in multiple systems. The process of the protection method includes: data needed by address mapping operation are initialized on a central processing unit (CPU) which is provided with memory management units; according to the size of the used internal memory of the data, the code segment and the data segment of the data are confirmed in a continuous virtual address section in a virtual address space by the RTOS; and according to the mechanism provided by the memory management units, the virtual address section used by the RTOS is mapped to an identical unused physical page frame through a common operating system. The protection method of the used internal memory of the RTOS in the multiple systems has the advantages of being small in memory cost and easy to operate, system operation efficiency is not reduced and time cost of the system is not increased. The virtual address section used by the RTOS is mapped to the physical page frame through the common operating system, memory isolation is achieved without large change of the operating system and addition of extra modules, and only space cost of one page of the physical page frame exists.

Description

technical field [0001] The invention belongs to the field of computer memory management, in particular to a method for protecting the memory occupied by a real-time operating system under multiple systems. Background technique [0002] In the embedded field, it is a trend that multiple operating systems run on one hardware platform at the same time, and real-time operating systems are a very important category in these operating systems. The real-time operating system has the characteristics of timely response and high reliability, which cannot be provided by ordinary operating systems. Combining the real-time operating system and the ordinary operating system can complement each other's advantages, provide more functions, and obtain higher hardware utilization. However, running multiple systems on the same hardware platform also brings some system security issues, especially memory security issues. Memory protection is an important research content of real-time operating ...

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Problems solved by technology

[0007] The present invention aims at increasing the memory protection function in the prior art, which will affect the reliability of the program, the robustness of the system, and the embedded real-time performance, and will increase the complexity of the system, resulting in unsmooth program execution and the generation of available space in the memory, etc. , provides a method for protecting the memory occupied by the real-time operating system under multiple systems, isolates the virtual address spaces used by the real-time operating system and the common operating system, and provides protection for the real-time operating system without increasing the complexity of the system. memory usage protection

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