Method for technically controlling secure access to embedded system memory

Abstract

The invention discloses a method for technically controlling secure access to an embedded system memory. The method includes the following steps of initially designing a system of a memory secure access mechanism, wherein an MPU memory protection unit is introduced, domain attributes of different grades are distributed, and an access attribute and a system initiating progress are set; secondly, designing the secure access to the memory for switching of embedded operation system process context, wherein a domain control module is set, the system process context is set, and switching of the system process content is achieved in the domain control module. The illegal access of all address space resources are detected and limited through a processor MPU hardware mechanism, the boundary control and context switching of any task of the embedded real-time multi-task operation system for accessing resources of other tasks is achieved, distributing and designing of cache, writing buffer and MPU attributes of different storage spaces in the system are achieved, and the control over secure access to all background domains in the memory is ensured.

Description

Technical field [0001] The present invention relates to the field of embedded systems, in particular to a technical realization method of embedded system memory safety access control. Background technique [0002] The operating environment of embedded systems varies greatly. System hardware and software must be tailored on a stable, safe, and reliable basis, eliminating redundancy, and striving to achieve higher performance with fewer hardware and software resources. In embedded real-time systems, memory management has different strategies according to different systems. General systems usually implement simple memory management through software mechanisms to achieve access control to the heap and stack, such as cross-border access and memory leaks. Etc., such as figure 1 Shown. [0003] The general embedded system adopts the real memory management strategy, and the access to the memory is direct. Its access to the address does not need to go through the MMU, but is directly sent ...

AI Technical Summary

Problems solved by technology

In the MMU memory management unit, although there is hardware access protection, the virtual memory mechanism will lead to uncertain I / O blocking time, making the program running time unpredictable, which is a fatal flaw in real-time embedded systems

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