JPH05197531A - Method for starting nonresident program - Google Patents

Abstract

PURPOSE:To speed up processing by switching the nonresident program to be switched by bank switching by using a bank memory under the control of an operating system. CONSTITUTION:This method is equipped with the main memory 11 of the CPU (central processing unit) of a computer system, an external storage device 12 such as a disk device, and unit memory spaces (bank) B1, B2...Bn controlled as bank memories by the operating system(OS) 13 stored on the main memory 11. In this case, when the nonresident program is newly loaded in the banks B1, B2...Bn, the bank switching is controlled without being overlaid as long as a free bank is left and when the nonresident program which is once started is restarted, the bank where the desired nonresident program is loaded is assigned to an area B according to the start address stored in the memory control program of the OS 13 to start the program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for activating a non-resident program in a computer system.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a method for starting a non-resident program in a computer system. Reference numeral 1 in the figure denotes a main memory of a CPU (central processing unit) of the computer system, and 2 denotes an external storage device such as a disk device.

In this illustrated example, an operating system (hereinafter referred to as OS) is provided in an area (memory space) of the main memory 1.
3), a resident program 4, a first non-resident program 5, and a second non-resident program 6 are loaded.

The OS 3 and the resident program 4 are stored in advance in the external storage device 2 or other external storage means, and are loaded on the main memory 1 when the CPU is activated.

The first non-resident program 5 is loaded by the resident program from the external storage device 2 into the main memory 1 and activated when necessary, and a usable memory space on the main memory 1 is available. , Is defined in an area subsequent to the memory space used by the resident program 4, and is loaded in the defined memory space by the overlay method (the arrow (a) in the figure indicates the external storage device 2). Shows the loading of the first non-resident program into main memory 1).

When the activated first non-resident program 5 finishes its operation, the activation is returned to the resident program 4 that called the first non-resident program (the arrow (c) in the figure indicates that the non-resident program operates). It indicates that it is finished and the startup is returned to the resident program).

The second non-resident program 6 is used because the first non-resident program 5, which has been started earlier, loads it from the external storage device 2 into the main memory 1 as necessary and starts it. The memory space on the main memory 1 is defined in an area subsequent to the memory space used by the first non-resident program 5, and the defined memory space is the same as in the case of the first non-resident program. In the overlay mode (the arrow (B) in the figure indicates the loading of the second non-resident program from the external storage device 2 to the main memory 1).

When the activated second non-resident program 6 finishes its operation, the activation is returned to the non-resident program 5 that called the second non-resident program 6.

[0009]

However, the main memory 1
In the conventional startup method of loading a non-resident program in the above predetermined memory space by the overlay method, the non-resident program that was loaded before that was created and held at the time of execution by newly starting the non-resident program. It disappears with the data.

Therefore, when the data held by the previously started non-resident program is needed again, or when it is desired to restart the previously started non-resident program, each time it is started, the non-resident program is restarted. , The main memory 1 by reading from the external storage device 2
It has to be loaded and started up, resulting in an increase in the number of accesses to the external storage device and an increase in the repetition of program processing by the same non-resident program, resulting in a series of processing times of the computer system using the non-resident program. There was a problem of being delayed.

The present invention has been made in view of the above circumstances, and reduces the number of accesses to an external storage device and at the same time,
An object of the present invention is to provide a method for starting a non-resident program which can reduce the number of times of repeating the program processing by the same non-resident program and thereby speed up a series of processing time of a computer system using the non-resident program.

[0012]

A method for starting a non-resident program according to the present invention uses a bank memory under the control of an operating system as a storage area for loading the non-resident program during operation of a computer system, and The feature is that the non-resident program to be activated is switched by bank switching.

[0013]

In the method of activating a non-resident program according to the present invention, the non-resident program required when the computer system is operated is loaded into the bank memory managed by the operating system of the computer system and activated, and once the bank memory is operated. The non-resident program loaded above is stored in the loaded bank as it is until the memory space on the bank memory is completely consumed or reset.

Therefore, when it becomes necessary to restart the previously used non-resident program, it is possible to easily and quickly load the main memory by switching the bank memory, and the external memory device can be used. It is not necessary to read it again and load it on the main memory.

Therefore, it is possible to reduce the number of times the external storage device is accessed and at the same time reduce the number of times the program processing is repeated by the same non-resident program, thereby speeding up a series of processing times of the computer system using the non-resident program. You can

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows an embodiment of a non-resident program starting method according to the present invention. Reference numeral 11 in the drawing indicates a main memory of a CPU (central processing unit) of a computer system. Reference numeral 12 denotes an external storage device such as a disk device, and B1, B2, ... Bn are managed as bank memories by an operating system (hereinafter abbreviated as OS) 13 placed on the main memory 11. It is a unit memory space (bank).

An area B for allocating each bank of the bank memory is set in the main memory 11.

Reference numeral M1 in the drawing shows the state in the main memory when the bank B1 is assigned to the area B, and reference numeral M2 is in the main memory when the bank B2 is assigned to the area B. The state Mn indicates the state on the main memory when the bank Bn is assigned to the area B.

In the case of this embodiment, bank B1 is loaded with the first non-resident program P1 and bank B2
Is loaded with the second non-resident program P2, and the bank Bn is loaded with the n-th non-resident program Pn (the arrow (d) in the figure indicates the bank B from the external storage device 12).
1 shows the loading of the first non-resident program P1 and the arrow (e) shows the loading of the second non-resident program P2 from the external storage device 12 to the bank B2).

In this embodiment, the OS 13 and the first to third resident programs 14, 15 and 16 are loaded into the memory space on the main memory except the area B, and all the non-resident programs are stored in the bank memory. It is supposed to be loaded.

Here, the OS 13 and the resident program 1
4, 15 and 16 are stored in advance in the external storage device 12 or other external storage means and are loaded on the main memory 11 when the CPU is activated.

Further, when the non-resident program is stored in the external storage device 12 and the resident program is executed after the OS 13 is booted, a bank memory is vacant from the external storage device 12 as required by the resident program. It is loaded into a bank (however, if there is no empty bank, it is loaded in one of the used banks by an overlay method as in the case of the conventional handling on the main memory) and activated.

As long as a non-resident program that has been loaded once is not lost unless the CPU is reset or a new non-resident program is loaded by the overlay method with no empty banks, The boot address (address of the storage bank) is stored in the memory management program (bank manager) of the OS 13.

To newly load a non-resident program in a bank, bank switching is controlled so that overlaying does not occur as long as there is an empty bank, and when the non-resident program that has been started is restarted, the memory of the OS 13 Based on the activation address stored in the management program, the bank in which the desired non-resident program is loaded is assigned to the area B and activated.

FIG. 3 shows a series of processing steps in an embodiment until the non-resident program is read from the external storage device 12 into the bank memory.

First, banks are switched to read the non-resident program (step 21). Next, it is determined whether the non-resident program has already been read into the switched bank memory (step 22). If it has already been read, go to step 25. If not, go to step 2
Execute 3.

In step 23, the function of the OS 13 is used to read the non-resident program into the switched bank and activate it. Then, when the activated program is completed, control is transferred to the next step 24.

In step 24, the address at the time of restarting is received from the non-resident program and saved in the memory management program of the OS 13. This completes the first startup of the non-resident program.

The above-mentioned step 25 is a process for restarting the non-resident program that was previously read and activated. By transferring control to the address saved in the process in the step 24, the non-resident program is executed. It starts without reading from the external storage device 12.

FIG. 4 shows an execution flow of the non-resident program that is read and started or restarted.

First, whether or not it has been started from the OS, that is,
It is determined in step 23 of FIG. 3 whether or not it has been started (step 31). If it is started from the OS, the process proceeds to step 32, and if not, the process proceeds to step 33.

In step 32, the operating environment of the non-resident program is prepared.

In step 33, the main program of the non-resident program is executed and the application is executed.

In step 34, the application is terminated and the address for reactivating the application is notified to the activation source, and then the interrupt return (IRET) is performed to return to the activation source.

In the non-resident program activation method of the above-described embodiment, the required non-resident program is loaded into the bank memory managed by the operating system of the computer system and activated when the computer system is operated. The non-resident program once loaded on the bank memory is saved on the loaded bank as it is until the memory space on the bank memory is completely consumed or reset.

Therefore, when it becomes necessary to restart the previously used non-resident program, it is possible to easily and quickly load the main memory by switching the bank memory, and the external memory device can be used. It is not necessary to read it again and load it on the main memory.

Therefore, it is possible to reduce the number of times the external storage device is accessed and at the same time reduce the number of times the same non-resident program repeats the program processing, thereby speeding up a series of processing times of the computer system using the non-resident program. You can Although not mentioned in the above-mentioned embodiment, the present invention is based on the non-resident program itself.
It is also effective in the case of a large program in which the size of the storage area required to execute the program exceeds the size in the main memory.

The non-resident program starting method according to the present invention can be applied to any computer system having a bank memory in a memory space under OS management.

Further, conventionally, such a large program is composed of a plurality of program segments, and another program is loaded on the main memory to perform a predetermined operation. Although it was necessary to design the overlay structure to cover the segments, in the case of using the present invention, all the program segments of the non-resident program are overlaid by only having the information to switch the bank to be stored for each program segment. It can be loaded on the bank memory without doing so, and the above-described actions and effects can be achieved.

[0039]

As is apparent from the above description, in the method for starting a non-resident program according to the present invention according to the present invention, the non-resident program required during the operation of the computer system is the operating system of the computer system. A non-resident program that is loaded into the bank memory managed by and started, and once loaded into the bank memory is stored in the loaded bank until the memory space on the bank memory is completely consumed or reset. To be done.

Therefore, when it becomes necessary to restart the previously used non-resident program, the bank memory can be easily and quickly loaded into the main memory by switching the banks, and the external storage device can be used. It is not necessary to read it again and load it on the main memory. Therefore, it is possible to reduce the number of accesses to the external storage device, and at the same time reduce the number of times of repeating the program processing by the same non-resident program, thereby speeding up a series of processing time of the computer system using the non-resident program.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional non-resident program starting method.

FIG. 3 is an explanatory diagram of a non-resident program starting process according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a non-resident program execution process according to an embodiment of the present invention.

[Explanation of symbols]

 11 Main Memory 12 External Storage Device 13 Operating System 14, 15, 16 Resident Program B Area B1-Bn Bank

Claims (1)

[Claims] 1. A non-resident program characterized by using a bank memory under the control of an operating system as a storage area for loading a non-resident program during operation of a computer system, and switching a non-resident program to be started by bank switching. How to start the program.