Method and system for protecting permission of volatile memory bank

Abstract

The invention discloses a method for protecting permission of a volatile memory bank. The method comprises the following steps: when receiving an operation request of an operation request user, an MPU analyzes the operation type in the operation request and the volatile memory bank corresponding to the operation type, and judges whether the operation request user has a permission to operate the volatile memory bank according to a permission protection mechanism; if so, the MPU transmits an authorization signal to a DMA controller; the DMA controller receives the authorization signal, and configures parameters corresponding to the operation type according to the operation request. Therefore, the DMA controller executes the corresponding operation only after the authorization of the MPU is successful, so that the data in the volatile memory bank are prevented from being illegally changed or read by other users, and the security is enhanced. As the protection mechanism for the volatile memory bank is added, the user can change the operation permission of the DMA on the volatile memory bank, and the operation flexibility is improved. In addition, the invention further discloses a system for protecting permission of the volatile memory bank, and the effects are as mentioned above.

Description

Technical field [0001] The invention relates to the embedded field, in particular to a method and system for protecting the authority of a volatile storage body. Background technique [0002] With the continuous advancement of technology, the research and application of embedded systems have been further deepened, and they have been developing in the direction of networking, intelligence, standardization, integration, and security. Memory is a memory device used to store information in modern information technology, and its type determines the operation and performance of the embedded system. According to storage characteristics, memory can be divided into volatile memory and non-volatile memory. Direct memory access (DMA controller), as a unique module for transferring data within the system, plays an important role in the ever-changing embedded field. At the same time, as an emerging application direction of embedded systems-information security, the protection of user data h...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the DMA controller and the MPU are two independent modules, which are not related to each other, which leads to the data in the volatile storage bank requested by the user being easily changed or illegally read by other users, making the data Security is greatly threatened

It is precisely because of the lack of a protection mechanism for volatile memory banks that if you want to protect volatile memory banks, you can only set the corresponding permissions during the chip production process, which leads to the user's DMA operation authority for volatile memory banks is fixed and cannot be changed for user needs

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