JPH03164965A - Starting system of microprocessor - Google Patents

Abstract

PURPOSE:To start a microprocessor with a simple program by setting a stop instruction and a branch instruction of the routine to be carried out next to the final two steps of each initial starting routine. CONSTITUTION:A diagnostic processor 1 serves as a processor circuit which control the microprocessors 3-5 via a diagnostic interface 2 and then initialize the microprocessors 3-5. In this case, a stop instruction and a branch instruction of the routine to be carried out next are set to the final two steps of the initial starting routines 31-33, 41-43, and 51-53 of the microprocessors 3-5 respectively. Thus each microprocessor can be initialized without setting the different start addresses for each microprocessor. Then a microprogram used for control of the processor 1 is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microprocessor startup method for starting a plurality of microprocessors constituting a computer system.

[Prior Art] In general, a computer system composed of multiple microprocessors has a diagnostic processor with diagnostic and initial setting control functions, and a processor installed between this diagnostic processor and other microprocessors for initialization. Equipped with a dedicated interface for diagnostics. The program storage section of each microprocessor stores a group of initial startup routines such as an initial diagnostic program and an initial setting program.

The diagnostic processor initializes the system by sequentially starting its initial startup routine in a series of steps and monitoring whether it is running or stopped. Furthermore, each routine is activated by setting the start address of the routine and starting it using the aforementioned diagnostic interface. Furthermore, by monitoring the termination of the microprocessor started by the diagnostic interface, it is possible to know when the execution of the routine has ended.

By the way, each microprocessor making up a computer system has a different role. Therefore, each has a different hardware configuration and a different microprogram configuration. Therefore, the initial diagnostic program,
The start addresses of the initialization programs are also usually different. For these reasons, the conventional startup method for microprocessors is such that the diagnostic processor is aware of the start address of each program in each microprocessor, and uses a diagnostic interface to set a different startup address for each microprocessor. It had become.

[Problems to be Solved by the Invention] However, in such a startup method, the diagnostic processor runs the initial diagnostic program of each microprocessor,
You must be aware of the start address of the initial setting program and set the start address each time you start it. Therefore, there is a problem in that the microprogram that controls the diagnostic processor becomes complicated.

The present invention has been made to solve these problems, and its purpose is to provide a microprocessor startup method that allows a microprocessor to be started using a simple program.

[Means for Solving the Problems] In order to achieve the above object, the present invention starts a plurality of microprocessors constituting a computer system,
In a microprocessor startup method for initializing the system, the last two steps of each initial startup routine stored in the program storage section of each microprocessor include:
It is characterized by setting a stop instruction to stop the operation of the microprocessor and a branch instruction for the next routine to be executed.

[Operation] According to the present invention, since the stop instruction and the branch instruction for the next routine to be executed are set in the last two steps of the initial startup routine of each microprocessor, there is no need to set a different startup address for each microprocessor. , it becomes possible to initialize each microprocessor.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the microprocessor startup method of the present invention.

In FIG. 1, a diagnostic processor 1 is a processor circuit that controls each microprocessor 3-5 via a diagnostic interface 2 and initializes each microprocessor 3-5. The diagnostic interface 2 is an interface circuit connected between the diagnostic processor 1 and each of the microprocessors 3 to 5, and is used to reset and start the microprocessors 3 to 5, and to reset and start the microprocessors 3 to 5.
It has a function of detecting the execution state and stop state of 5.

Each program storage section of the microprocessors 3 to 5 includes:
The first one to initialize each microprocessor.
An initial startup routine to a third initial startup routine are stored. The startup routine of the microprocessor 3 is the first initial startup routine 31 to the third initial startup routine 33, and that of the microprocessor 4 is the first initial startup routine 41 to the third initial startup routine 33.
The third initial startup routine 43 and the microprocessor 5 are the first initial startup routine 51 to the third initial startup routine 53. Further, the program storage section of each microprocessor contains a main processing routine 34. which is the original processing routine.
44.54 is stored.

Each first initial startup routine is the first routine that each microprocessor executes in response to a startup command from the diagnostic processor 1. The last two steps of each first initial startup routine are a stop instruction and a branch instruction to the second initial startup routine. Further, each second initial startup routine is the second routine executed by each microprocessor, and similarly, its final two steps are a stop instruction and a branch instruction to the third initial startup routine. Further, each third initial startup routine is the third routine executed by each microprocessor, and similarly, the final step is a stop instruction and a branch instruction to the main processing routine.

Next, the operation of the embodiment will be explained with reference to the flowchart shown in FIG.

First, in S (step) 1, the diagnostic processor 1 resets the microprocessors 3 to 5 via the diagnostic interface 2. At this time, the startup address of each microprocessor points to its respective first initial startup routine.

Next, in S2, the diagnostic processor 1 activates each of the microprocessors 3 to 5 via the diagnostic interface 2, whereby each microprocessor executes a first initial startup routine. Since the last two steps of each first initial startup routine are a stop instruction and a branch instruction to the second initial startup routine as described above, each microprocessor stops after executing a predetermined process. Diagnostic processor l is S3
Then, the status of each microprocessor is checked via the diagnostic interface 2, and the system waits for the operation to stop as described above.

When all the processors have stopped, the diagnostic processor 1 starts up the microprocessors 3 to 5 again in S4, so that each microprocessor executes the second initial startup routine instructed in S2. Final 2 of 2nd initial startup Lujin
The steps are likewise a stop instruction and a branch instruction to the third initial startup routine. Therefore, the diagnostic processor 1 waits for each microprocessor to stop in S5, and when all the microprocessors have stopped, the process proceeds to S6. The diagnostic processor 1 starts each of the microprocessors 3 to 5 in S6, and each microprocessor executes the third initial startup routine instructed in S4. Similarly, the final two steps of the third initial startup routine are a stop instruction and a branch instruction to the main processing routine. In S7, the diagnostic processor 1 waits for each microprocessor to finish executing the third initial startup routine. Initialization of the microprocessors 3 to 5 is completed through such a procedure. The diagnostic processor 1 then activates the microprocessors 3 to 5 via the diagnostic interface 2 in S8, and each microprocessor executes the instructed main processing routine.

[Effects of the Invention] As explained above, according to the present invention, the complicated process of setting the startup address of each microprocessor each time it is started becomes unnecessary, and the microprogram for controlling the diagnostic processor can be simplified. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the microprocessor starting method of the present invention, and FIG. 2 is a flowchart showing the operation of the embodiment of FIG. 1...Diagnostic processor 2...Diagnostic interface 3-5...Microprocessor

Claims (1)

[Claims] In a microprocessor startup method that starts a plurality of microprocessors constituting a computer system and initializes the system, the last two steps of each initial startup routine stored in the program storage section of each microprocessor include A microprocessor startup method characterized by setting a stop instruction to stop operation and a branch instruction for a routine to be executed next.