JPH05158816A - Main memory checking system - Google Patents

Abstract

PURPOSE:To shorten time till control is delivered to an OS after starting a system. CONSTITUTION:The area of a main memory 1 required within starting programs 1, 2 is checked by sub-routine, and simultaneously, the remaining area after this check is checked by the sub-routine based on the information of a register GR (0) 3 by using the idle time of the processing of a CPU like I/O queuing, etc. If there is the area of the main memory incapable of being checked yet after the check by the sub-routine, it is checked by the sub-routine based on the information of the register GR (0) 3 before the control is delivered to the OS.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main memory check system used in a computer equipped with a CPU having a general-purpose register group.

[0002]

2. Description of the Related Art In a conventional information processing system, at the start of processing in a start-up program, a check is made for the presence or absence of processing errors in all areas of the main memory, so-called.
The program is loaded in this main memory.

[0003]

In the conventional main memory check method as described above, the start-up program is started after the entire area of the main memory has been checked. The drawback is that it takes time.

An object of the present invention is to solve such problems and to provide a main memory check method capable of shortening the time from starting the system to passing control to the OS.

[0005]

According to the main memory check method of the present invention, in a computer using a CPU having a general-purpose register group, a general-purpose register for storing at least the size of the checked main memory and a specified size It has a subroutine to check the main memory and checks only the area of the main memory required in the startup program with the subroutine,
The remaining area after this check is characterized by being checked by a subroutine based on the information in the register by utilizing the processing idle time of the CPU.

Further, after the above-mentioned subroutine check, if there is an area of the main memory that cannot be checked yet, the check is performed before the control is transferred to the operating system by the subroutine based on the information of the register. Is.

Further, the rising program is characterized by being stored in a read only memory.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the main memory check system of the present invention will be described below with reference to the drawings.

1, FIG. 2, FIG. 3 and FIG. 4 show the construction of the embodiment.

1, FIG. 2, FIG. 3 and FIG. 4, in this example, a main memory 1, a register GR (0) 3, which is one of the general-purpose registers in the CPU 2, and a ROM 5 for storing the program 1, RO that stores program 2
External disk device 7 for storing M6 and program 3
It consists of and.

Here, the programs 1, 2, and 3 are startup programs.

The register GR (0) 3 stores the size of the checked main memory 1 in units of kilobytes (hereinafter referred to as Kb).

The ROM 5 stores the subroutine MMCHK (X) 4 in the program 1.

The subroutine MMCHK (X) 4 has a specified size (XK) as will be described in detail with reference to FIG.
The area of the main memory 1 of b) is checked, and the checked Kb number of Xs is added to the register GR (0) 3.

Next, the operation of this processing configuration will be described.

In FIG. 1, when the operation starts, the ROM 5
Program 1 stores 0 (zero) in the register GR (0) 3 for initialization.

Then, the subroutine MMCHK (X) 4
The program 2 of the ROM 6 checks the size 1000 Kb (area 8) required on the main memory 1 by using, and the checked size 1 in the register GR (0) 3.
Store 000 Kb.

In FIG. 2, the size required by the program 2 on the main memory 1 is checked. After this, R
The program 2 stored in the ROM 6 is loaded into the area 8 of the main memory 1 by the program 1 stored in the OM 5.

In FIG. 3, the program 2 of the main memory 1 uses the subroutine MMCHK (X) 4 to check the size 3000 Kb required by the program 3 of the external disk device 7 on the main memory 1. Then, the size 40 already checked in the register GR (0) 3
Stores 00 Kb.

In FIG. 4, after checking the size required by the program 3 on the main memory 1, the program 2 of the main memory 1 loads the program 3 of the external disk device 7 into the area 9 of the main memory 1. The size of the main memory 1 is 4000 Kb by utilizing the idle time of CPU processing such as waiting for I / O processing while loading this area 9.
Check (area 10). After this check, the remaining area 11 of the main memory 1 is stored in the external disk device 7
Check before loading program 3 of
The check of all areas of the main memory 1 is completed.

Further, the processing operation will be described.

FIG. 5 shows a flow in the operation of the embodiment.

In FIG. 5, 7A is a process performed by the program 1 in the ROM 5, and 8A is a process performed by the program 2 in the ROM 6. 9A is a process performed by the program 3 in the main memory 1.

In the process 7A, the register G is processed in the process 1a.
Store 0 (zero) in R (0) 3 and register GR (0) 3
To initialize. Subroutine MMCHK (1
000) 4 is executed. In process 3a, the program 2 in the ROM 6 is loaded into the area 8 of the main memory 1.

In process 8A, the subroutine MMCHK (3000) 4 is executed in process 4a, and the program 3 of the external disk device 7 is loaded into the area 9 of the main memory 1 in process 5a. Also, the remaining I / O waiting time is used to check the remaining area of the main memory 1.

After the program 3 is loaded in the process 9A, the program 3 in the main memory 1 is activated in the process 6a, the process is passed to the program 3, and the operation is completed.

FIG. 6 shows the subroutine MMCHK in FIG.
The process of (X) 4 is shown.

In FIG. 6, in process 1b, register G
The XKb main memory 1 is checked from the address of R (0) 3.

In process 2b, the register GR (0) 3 + X
A process of setting Kb as the register GR (0) 3 is performed.

FIGS. 7A, 7B and 7C show the process 5a in FIG. 5 in detail.

In the process 5a, the I / O instruction is followed by 11C.
The process of 12C and the process of 12C are performed before the end of loading the program 3.

In FIG. 7A, in the processing of 11C,
The program 3 of the external disk device 7 is loaded into the main memory 1, and when an OUT instruction 1c being loaded occurs, it is determined in step 2c whether or not there is an unchecked area of the main memory 1. If there is an unchecked area in the main memory 1, the main memory 1 is checked in step 3c in step 5c.
Only 00Kb is performed and the process returns to the process 2c.

Even if there is no unchecked area in the main memory 1, the process returns to step 2c and an infinite loop is created in step 11C.

In FIG. 7B, in the processing of 11C,
When an interrupt occurs, the process immediately jumps to WARI1 in process 4c and the next process is performed. However, the subroutine M
Interrupts during execution of MCHK (500) 7c are prohibited.

In FIG. 7C, in the process of 12C,
In process 9c, it is judged whether or not there is an unchecked region of the main memory 1, and if the check of all regions of the main memory 1 is completed, the process 5a ends. If the check of all the areas of the main memory 1 is not completed, the remaining area of the main memory 1 is checked in the process 10c, and the process 5 is performed.
a is ended.

[0036]

As is apparent from the above description, in the main memory check method of the present invention, the area of the main memory required in the rising program is checked by the subroutine, and the remaining area of the main memory 1 is checked. , I / O wait time, etc. of the CPU are used to check the main memory by a subroutine based on the register information, and if there is an area of the main memory that cannot be checked, Since the remaining area is checked based on the information in the register before the control is transferred to the OS, there is an effect that it is possible to shorten the time from the start of the system to the transfer of the control to the OS.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration in an embodiment of a main memory check system of the present invention.

FIG. 2 is a diagram showing a configuration in another processing according to the embodiment.

FIG. 3 is a diagram showing a configuration in still another process in the example.

FIG. 4 is a diagram showing a configuration in still another process in the example.

FIG. 5 is a flowchart showing the processing operation of the embodiment.

FIG. 6 is a flowchart showing a process of a subroutine MMCHK (X).

7 (a), (b) and (c) are flow charts showing details of the processing of processing 5a in FIG.

[Explanation of symbols]

 1 Main memory 2 CPU 3 Register GR (0) 4 Subroutine MMCHK (X) 5,6 ROM 7 External disk device

Claims (3)

[Claims] 1. A rising program comprising a general-purpose register for storing at least the size of a checked main memory and a subroutine for checking a main memory of a specified size, in a computer using a CPU having a general-purpose register group. In the subroutine, only the area of the main memory required in the above is checked, and the remaining area after this check is checked in the C
A main memory check method characterized by performing a check by the sub-routine based on the information of the register by utilizing the processing idle time of the PU. 2. After the checking of the subroutine, if there is an area of the main memory that cannot be checked yet, the checking is performed before the control is transferred to the operating system by the subroutine based on the information of the register. The main memory check method according to claim 1. 3. The main memory check method according to claim 1, wherein the rising program is stored in a read-only memory.