An efficient and safe computer online self-checking method and self-checking device

Abstract

The invention relates to a method and a device for efficient and safe computer on-line self-checking. The self-checking method comprises the steps that an equipment initialization module initializes on-line self-checking tasks, internal memory spaces which are needed by the on-line self-checking tasks to use are distributed, internal memory information which is necessary for on-line self-checking internal memory testing, testing data which is designed in advance and expected results are acquired; after the signals which carry out on-line self-checking continuously are acquired, central processing unit (CPU) testing and internal memory testing are carried out in sequence, when a fault is detected, failure processing is carried out, and meanwhile fault information is subjected to display alarm and recording. The self-checking device comprises the equipment initialization module, a CPU testing module, an internal memory testing module and a failure processing module. Compared with the prior art, the feature of data stored in an internal memory is combined, an existing algorithm is optimized, and the method and the device have the advantages of being short in self-checking cycle, high in diagnosis covering rate, high in execution efficiency, independent in internal memory resource and the like.

Description

technical field [0001] The invention relates to a method and device for self-checking equipment in the field of safety, in particular to an efficient and safe computer online self-checking method and a self-checking device. Background technique [0002] Online self-inspection is the basis for realizing the safe operation of the computer platform. Generally, the CPU and memory of the computer platform are periodically tested to ensure the security of the computer platform, and necessary interventions are carried out in a timely and effective manner after hardware failure is detected. CPU detection usually has high execution efficiency and can be completed in a short period of time; memory detection usually has a very large area to be tested, and high-security detection algorithms have high complexity and often take a very long time. [0003] With the increasing emphasis on security in the embedded field, the large amount of communication data of the security computer, the un...

AI Technical Summary

Problems solved by technology

[0004] 1. The problem of self-test cycle: With the increase of communication traffic and the richness of applications, the computer platform will use more memory to meet the increasing communication and application overhead

[0005] 2. The problem of diagnostic coverage: In order to ensure the efficiency of online self-inspection, online self-inspection usually adopts a technology with relatively low diagnostic coverage, which sacrifices certain security while improving the efficiency of online self-inspection

Not instrumenting unused memory reduces the diagnostic coverage of the entire memory to the 99% expected by the algorithm

[0006] 3. Execution efficiency of the existing high-security online detection algorithm: For the memory detection used, the Abraham algorithm is usually used, and a 32-bit processor is used to detect a memory block with a length of N words. The complexity of the current optimal algorithm is 30N×m, where the algorithm complexity is 30N, and m sets of test data are required

In a processor with a cache, the data in the cache will be read directly during memory detection, which cannot really achieve the purpose of memory detection, and will have a certain impact on the diagnostic coverage of the algorithm.

In order to ensure that the cache does not affect the effectiveness of the memory detection algorithm, the method of disabling the cache and waiting for the cache data to expire will be used, which will cause the memory detection to take too long

[0007] 4. The problem of strong coupling between online self-test memory resources and other functions: as a part of a secure computer, online self-test often mixes the memory used with other functions of the computer and the memory used by the operating system, increasing data storage Coupling

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