CN111611119B - Method and system for realizing on-line self-check of RAM (random Access memory) under real-time operating system - Google Patents
Method and system for realizing on-line self-check of RAM (random Access memory) under real-time operating system Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing RAM online self-checking under a real-time operating system, which belong to the technical field of RAM online self-checking and comprise the following steps: s1: dividing the RAM to be tested into a plurality of non-overlapping independent areas D i (ii) a S2: each independent area D i Divided into a number of non-overlapping independent cells D i U j (ii) a S3: respectively in each independent unit D i U j The on-line self-checking of the RAM is operated to obtain the whole on-line self-checking task of the RAM completed within a specified time; s4: judging whether the whole RAM on-line self-checking task is normal, if so, entering the step S5, and if not, finishing the self-checking; s5: and step S1 is circularly performed to divide the RAM area again, so that the requirements of short RAM online self-checking time and strong operating system practicability under the dynamic detection of high coverage rate are met, the execution efficiency of the RAM online self-checking is improved, and the real-time performance of the computer operating system is further improved.
Description
Technical Field
The invention relates to the technical field of RAM online self-checking, in particular to a method and a system for realizing RAM online self-checking under a real-time operating system.
Background
The industrial safety computer is a safety demanding device and is a core device in most of vehicle-mounted ATP devices, interlocks (CIs), zone Controllers (ZCs) and Data Storage Units (DSUs) in the rail transit signal control system. Because the application programs and application data of the security computer are stored in the RAM, the RAM online self-checking technology is one of the most basic security technologies for ensuring the security and reliability of the security computer.
The core of the online self-checking lies in that a dynamic detection measure with high coverage rate is adopted, and the on-line self-checking is guided to and kept in a safe state after a fault. However, both the MarchC algorithm and the Abraham algorithm are RAM self-test technologies with high coverage rate, but if the RAM self-test technologies are directly used for RAM online self-test of a security computer, the RAM online self-test technologies have the defects of long time consumption and influence on the real-time performance of the system.
In order to solve the defects, the conventional method adopts a mode of testing the RAM section by section after the RAM is segmented, but the mode causes coupling failure between the segmented RAM units to be hardly measurable, and the detection coverage rate is influenced, so that the adoption of the mode of RAM segmentation does not solve the requirements of short online self-detection time consumption of the RAM and strong practicability of an operating system under the dynamic detection of high coverage rate.
Disclosure of Invention
The invention aims to reduce the time consuming duration of the on-line RAM self-checking under the dynamic detection of high coverage rate, improve the execution efficiency of the on-line RAM self-checking and simultaneously have stronger practicability of an operating system.
In order to achieve the above purpose, the invention adopts a method for realizing the on-line self-check of the RAM under a real-time operating system, which comprises the following steps:
s1: dividing RAM to be tested into a plurality of non-overlapping independent areas D i ；
S2: each independent area D i Divided into a number of non-overlapping independent cells D i U j ；
S3: respectively in each independent unit D i U j The on-line self-checking of the RAM is operated to obtain the whole on-line self-checking task of the RAM completed within a specified time;
s4: judging whether the whole RAM online self-checking task is normal, if so, entering the step S5, and if not, ending the self-checking;
s5: the loop goes to step S1 to re-partition the RAM.
Further, the air conditioner is provided with a fan,in step S3: respectively in each independent unit in turn i U j The method comprises the following steps of running the on-line self-check of the RAM to obtain the whole on-line self-check task of the RAM completed within the specified time, wherein the on-line self-check task of the RAM comprises the following steps:
one independent unit D is operated regularly in each task period M i U j The RAM in the system is subjected to online self-checking;
and the whole RAM online self-checking task is completed within a specified time T, wherein T is more than or equal to M multiplied by i multiplied by j.
Further, in step S5: circularly entering the step S1 to perform area division on the RAM again;
repartitioned independent area D i ' different from the independent area D i Repartitioned independent unit D i ’U j ' different from the independent unit D i U j 。
Further, the independent area D i ' both position and size are different from the independent area D i Independent unit D i ’U j ' both in position and size different from the independent unit D i U j 。
Further, the independent area D i ' and independent area D i Randomly divided, independent units D i ’U j ' and independent Unit D i U j And (4) randomly dividing.
Further, in step S3: respectively in each independent unit D i U j And running the RAM on-line self-check to obtain the whole RAM on-line self-check task completed within the specified time, wherein the RAM on-line self-check adopts a MARCH-TB algorithm to detect the memory fault.
A computer RAM online self-checking system comprises an area dividing module, a unit dividing module, a RAM self-checking module and a judging module;
the region dividing module is used for dividing the RAM to be tested into a plurality of non-overlapping independent regions D i ；
A unit dividing module for dividing each independent region D i Divided into a number of non-overlapping independent cells D i U j ；
RAM self-checkThe modules are used for respectively and sequentially arranging each independent unit D i U j The on-line self-checking of the RAM is operated to obtain the whole on-line self-checking task of the RAM completed within a specified time;
the judging module is used for judging whether the whole RAM on-line self-checking task is normal, if so, entering the area dividing module, and if not, finishing the self-checking.
The device for the on-line self-test of the RAM of the computer comprises a storage, a processor and a computer program which is stored in the storage and can run on the processor, and is characterized in that the processor executes the computer program to realize the on-line self-test method of the RAM.
A computer readable storage medium having stored thereon a number of get sorting programs for being invoked by a processor and executing the RAM on-line self-test method.
Compared with the prior art, the invention has the following technical effects: by dividing the RAM into random units, the coupling failure between the RAM units caused by division of fixed sections is overcome, and the high coverage rate of the RAM on-line self-inspection is ensured; meanwhile, the RAM online self-checking is carried out on the independent units divided each time, so that the RAM self-checking time can be shortened, the RAM online self-checking execution efficiency is improved, and the real-time performance of the computer operating system is improved under the condition of high coverage rate.
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The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a flow chart of steps of a method for implementing on-line self-test of a RAM under a real-time operating system.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in FIG. 1, an implementation method for on-line self-checking of RAM under a real-time operating system includes
The following steps S1 to S6:
s1: dividing RAM to be tested into a plurality of non-overlapping independent areas D i ；
That is, the RAM is divided into i independent areas D 1 、D 2 、…D i . Independent area D i Is random.
S2: each independent area D i Divided into a number of non-overlapping independent cells D i U j ；
I.e. each independent area D i Divided into j independent cells D i U 1 、D i U 2 、…D i U j (ii) a The whole RAM is thus divided into (i × j) individual cells, of which individual cell D i U j The partitioning is also random.
S3: respectively in each independent unit D i U j Running the RAM on-line self-checking to obtain the whole RAM on-line self-checking task completed within a specified time;
and performing online self-inspection on the RAM by adopting a MARCH-TB algorithm to perform memory failure detection. The self-test is as follows: firstly, a test data is written into an independent unit D of the RAM i U j From the corresponding independent unit D of the RAM i U j The stored value is read and a secure state is entered if the test data is different from the stored value. Test data bits 0x 555555555555, 0xAAAAAAA, 0x33333333, 0x99999999, 0xCCCCCCCC, 0x66666666, 0x00000000, 0xFFFFFFFF, 0xF0F0F0F 0F0, 0x0F0F0F0F are used, all of which are written in one pass.
The application aims at the RAM online self-checking of the industrial safety computer with a real-time operating system, the safety state is a term in the industrial safety computer, and the safety state can be understood as ending the RAM self-checking.
S4: judging whether the whole RAM on-line self-checking task is normal, if so, entering the step S5, and if not, performing the step S;
s5: the loop goes to step S1 to re-partition the RAM.
S6: and finishing the on-line self-checking of the RAM.
The core of the RAM online self-checking is that a dynamic detection measure with high coverage rate is adopted, the RAM online self-checking is finished after a computer fails, and the industrial safety computer can be guided to and kept in a safe state at the moment. In the steps S1 to S6, aiming at the problem that in the prior art, when the RAM is segmented and then tested section by section in the on-line detection of the RAM, the coupling between the segmented RAM units fails, the whole RAM is divided into areas, randomness is provided in the dividing process of the whole RAM independent area and the whole RAM independent unit, the coupling failure between the RAM units caused by the division of the fixed sections is overcome, and the high coverage rate of the on-line self-detection of the RAM is ensured; meanwhile, the on-line self-checking execution efficiency of the RAM can be improved, and the real-time performance of the computer operating system is further improved.
Preferably, in step S3: respectively in each independent unit in turn i U j The method comprises the following steps of S31 to S32:
s31: one independent unit D is operated in each task period M in a timing mode i U j The RAM in the system is subjected to online self-checking;
the task period M can be preset according to the speed of the RAM online self-test or the self-test requirement of the operating system, and the task period M can be modified. In each task cycle M, only one independent unit D is operated i U j (ii) a In the case of separate operation of independent units D i U j When the on-line self-checking operation of the RAM in the previous independent unit is completed, the on-line self-checking of the RAM of the next independent unit can be randomly carried out, or the on-line self-checking of the RAM of the next independent unit can be carried out according to the sequence.
S32: and the whole RAM online self-checking task is completed within a specified time T, wherein T is more than or equal to M multiplied by i multiplied by j.
Therefore, only one independent unit can be operated at regular time in each task period M, so that the whole RAM online self-checking task needs to be operated, and the minimum required time is (M multiplied by i multiplied by j); when the time for completing the whole RAM on-line self-checking task is lower than (M multiplied by i multiplied by j), the existence of an area or a unit which is not self-checked is indicated, and the whole RAM on-line self-checking task needs to be completed within the specified time T again, so that the whole RAM on-line self-checking task is accurately completed.
In steps S31 to S32, the on-line self-inspection of the entire RAM is implemented, and the on-line self-inspection of the RAM is performed on the independent unit newly divided each time, so that the self-inspection time of the RAM can be shortened under high coverage.
Preferably, in step S5: circularly entering the step S1 to divide the RAM into areas again; repartitioned independent area D i ' different from the independent area D i Repartitioned independent units D i ’U j ' different from the independent unit D i U j . The independent area D i ' random division, independent Unit D i ’U j ' random division.
The independent area D i ' both position and size are different from the independent area D i Independent unit D i ’U j ' both in position and size different from the independent unit D i U j 。
When the RAM is segmented and then is tested section by section, the effect of setting the size and the position of each independent area to be different is to overcome the defect that the coupling failure between units caused by the fixed segmentation of the RAM is not measurable, so that the detection coverage rate is influenced, the high coverage rate of the on-line self-detection of the RAM is ensured, and the execution efficiency of the on-line self-detection of the RAM is improved.
A computer RAM online self-checking system comprises an area dividing module, a unit dividing module, a RAM self-checking module and a judging module;
the region dividing module is used for dividing the RAM to be tested into a plurality of non-overlapping independent regions D i ；
A unit dividing module for dividing each independent region D i Divided into a number of non-overlapping independent cells D i U j ；
The RAM self-checking module is used for respectively and sequentially arranging each independent unit D i U j The on-line self-checking of the RAM is operated to obtain the whole on-line self-checking task of the RAM completed within a specified time;
the judging module is used for judging whether the whole RAM on-line self-checking task is normal, if so, entering the area dividing module, and if not, finishing the self-checking.
The device for the on-line self-test of the RAM of the computer comprises a storage, a processor and a computer program which is stored in the storage and can run on the processor, and is characterized in that the processor executes the computer program to realize the on-line self-test method of the RAM.
A computer readable storage medium having stored thereon a number of get sorting programs for being invoked by a processor and executing the RAM on-line self-test method.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (7)
1. A method for realizing on-line self-check of a RAM under a real-time operating system is characterized by comprising the following steps:
s1: dividing RAM to be tested into a plurality of non-overlapping independent areas D i ；
S2: each independent area D i Divided into a number of non-overlapping independent cells D i U j ；
S3: respectively in each independent unit D i U j Running the RAM on-line self-checking to obtain the whole RAM on-line self-checking task completed within a specified time;
s4: judging whether the whole RAM on-line self-checking task is normal, if so, entering the step S5, and if not, finishing the self-checking;
s5: circularly entering step S1, and dividing the single objects into multiple independent objectsVertical region D i ' different from the independent area D i Repartitioned independent unit D i ’U j ' different from the independent unit D i U j ；
In step S3: respectively in each independent unit in turn i U j The method comprises the following steps of running the RAM online self-checking to obtain the whole RAM online self-checking task completed in a specified time, wherein the steps of:
one independent unit D is operated in each task period M in a timing mode i U j The RAM in the system is subjected to online self-checking;
and the whole RAM online self-checking task is completed within a specified time T, wherein T is more than or equal to M multiplied by i multiplied by j.
2. The method for realizing the online self-test of the RAM under the real-time operating system according to claim 1, wherein the independent area D is a memory area i ' both position and size are different from the independent area D i Independent unit D i ’U j ' both in position and size different from the independent unit D i U j 。
3. The method for realizing the on-line self-check of the RAM under the real-time operating system according to claim 2, wherein the independent area D i ' and independent area D i Randomly divided, independent units D i ’U j ' and independent Unit D i U j And (4) randomly dividing.
4. The method for realizing the online self-check of the RAM under the real-time operating system according to claim 1, wherein in step S3: respectively in each independent unit D i U j And running the RAM on-line self-check to obtain the whole RAM on-line self-check task completed within the specified time, wherein the RAM on-line self-check adopts a MARCH-TB algorithm to detect the memory fault.
5. A computer RAM online self-checking system is characterized by comprising an area dividing module, a unit dividing module, a RAM self-checking module and a judging module;
the region dividing module is used for dividing the RAM to be tested into a plurality of non-overlapping independent regions D i ；
A unit dividing module for dividing each independent region D i Divided into a number of non-overlapping independent cells D i U j ；
The RAM self-checking module is used for respectively and sequentially arranging each independent unit D i U j The on-line self-checking of the RAM is operated to obtain the whole on-line self-checking task of the RAM completed within a specified time;
the judging module is used for judging whether the whole RAM on-line self-checking task is normal, if so, the RAM enters the area dividing module and is divided again into independent areas D i ' different from the independent area D i Repartitioned independent unit D i ’U j ' different from the independent unit D i U j If not, finishing the self-checking;
the RAM self-checking module is specifically used for regularly running one independent unit D in each task cycle M i U j The whole RAM online self-checking task is completed within a specified time T, wherein T is more than or equal to M multiplied by i multiplied by j.
6. An on-line self-test device for a computer RAM, comprising a storage, a processor and a computer program stored in the storage and executable on the processor, wherein the processor executes the computer program to implement the on-line self-test method for the RAM according to any one of claims 1 to 4.
7. A computer readable storage medium, wherein a plurality of acquisition classification programs are stored on the computer readable storage medium, and the acquisition classification programs are used for being called by a processor and executing the RAM online self-test implementation method according to any one of claims 1 to 4.
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| CN114168370A (en) * | 2020-09-11 | 2022-03-11 | 北京广利核系统工程有限公司 | Method and device for realizing real-time operating system RAM diagnosis and computer equipment |
| CN112948192B (en) * | 2021-03-05 | 2024-02-09 | 北京控制工程研究所 | 1553B bus remote terminal fault detection and processing method and system based on RAM self-checking |
| CN114443399A (en) * | 2022-02-08 | 2022-05-06 | 深圳市振邦智能科技股份有限公司 | Single-chip microcomputer RAM (random access memory) checking method based on clock interrupt and related components |
| CN119920294A (en) * | 2025-04-03 | 2025-05-02 | 上海汽车芯片工程中心有限公司 | A method for online self-test of random access memory on chip |
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