JPH0378843A - Program control system using extension memory - Google Patents

Abstract

PURPOSE:To attain the working of application programs in parralel with each other by performing the unitary control of the requests given to an extension memory control program means which controls an extension memory via a program control monitor means and setting totally each application program into the extension memory. CONSTITUTION:Each application program consists of the logical pages in number smaller than the number of physical pages of a page frame 3 and set into an extension memory 2. A program control monitor 7 contains a program control table 8 to control each application program of the memory 2. Then the monitor 7 controls the execution of each application program and gives a request to an extension memory control program memory 6 so as to set each physical page 4 in the frame 3 of a main storage 1 in accordance with a logical page 5 in the memory 2 containing the application program to be actuated next. Thus it is possible to make plural application programs work in parallel with each other in the memory 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control method for a program running on an extended memory.

[Conventional technology]

Figure 3 is from Nikkei Pi), November 1988 issue.

Pages 157-162, “64 in Part 2 Memory Management EMS”
FIG. 2 is an explanatory diagram of the operation of an extended memory in the program control method of a personal computer described in ``Overcoming the Wall of 0''. In the figure, 1 is, for example, 0 to IM
Main memory with main memory space of bytes, 2 for example up to 3
A 2 Mbyte extended memory 3 is a page frame in which an address in the main memory 1 is allocated on the extended memory 2. This page frame 3 is taken as a window for accessing logical pages, and usually has one page of 4 pages (4 bytes on page 16 - bytes on 64), and has more than 640 pages.
It is taken somewhere in main memory 1 space within the range of IM bytes.

4 constitutes page frame 3, and 0.1 .
Physical pages 2.3 and 5 are logical pages that divide the extended memory 2, each consisting of 16 bytes in a continuous area. 10 is a physical page map that associates the physical page 4 with the logical page 5; 11 is a logical page map that manages the logical pages owned by each application program; and 6 is an extended memory manager (Exp) that manages the extended memory 2.
anded Memory Manager; hereinafter abbreviated as -EMM. ).

Next, the operation will be explained. An application program that uses expanded memory 2 needs E
Request to MM6. The EMM 6 searches for unused logical pages 5 in the extended memory 2, and if the requested logical pages are acquired, registers each acquired logical page 5 in the logical page map 11, and then sends the EMM handle number to the application. If the number of requested logical pages cannot be acquired, the acquisition failure is notified to the application program. Next, the application program requests the EMM 6 to associate the physical page 4 in the page frame 3 with the logical page 5 by specifying the EMM handle number. This allows EMM6
registers the correspondence in the physical page map 10 and sets the physical page address to the logical page address. In this way, each application program can set its own data and subroutines on the extended memory 2 by making the above-mentioned request to the EMM 6.

[Problem to be solved by the invention]

As described above, the conventional program control method using extended memory requires the application program to make requests to the EMM 6 by itself, and also because the application stack cannot be set on the extended memory 2. There were problems such as the inability to set the entire application program to the extended memory 2.

This invention was made to solve the above-mentioned problems, and it is possible to place the entire application program including the stack on extended memory so that multiple application programs can operate in parallel on the extended memory. The purpose of this study is to obtain a program control method using extended memory.

[Means to solve the problem]

A program control method using an extended memory according to the present invention includes an extended memory management program means for controlling the extended memory, and a program management monitor means for controlling the execution of an application program on the extended memory,
When transferring control to an application program, the program management monitor means requests the extended memory management program means to associate the main memory with the extended memory.

[For production]

The program management monitor means according to the present invention manages the execution of the application program and associates each physical page in the page frame of the main memory with the logical page in the extended memory in which the application program to be executed next exists. requests to the extended memory management program means.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, the same or equivalent parts as in the conventional example shown in FIG. 3 are given the same reference numerals 1 to 6, and their explanation will be omitted. Each application program is composed of a number of logical pages that is less than the number of physical pages of the page frame 3, and is placed on the extended memory 2. 7 is a program management monitor that manages the execution of each application program and relies on the EMM 6 for the correspondence between the physical page 4 and the logical page 5;
is a program management table used by the program management monitor 7 placed in the main memory 1 to manage each application program; 9 is an interrupt routine existing in the main memory 1;

The program management monitor 7 maintains a program management table 8 for managing each application program on the extended memory 2, and manages execution and termination of each application program. The program management table 8 includes a status flag 8a that indicates whether each application program is executable, a context 8b that holds each register value when execution of the application program is interrupted, and a context flag 8b that corresponds to each application program. An EMM handle number 8c and the number of logical pages 8d owned by each application program are listed.

Figure 2 shows the application information on the program management monitor 7.
A flowchart of a dispatcher portion that switches program execution is shown. The operation of this embodiment will be described below mainly with reference to FIG.

First (al), search the status flag 8a in the program management table 8, and then select the application to be executed.
Examine the program. Next (in bl, specify the EMM handle number 8c in the program management table 8,
The EMM 6 associates physical pages 4 and logical pages 5 by the number of logical pages 8d in the program management table 8.
to request.

Considering that the program stack exists on extended memory 2, the space between the physical page and logical page is as follows:
A relationship exists where the number of physical pages≧the number of logical pages.

Next, in (C1), the context 8b in the program management table 8 is restored, and in (dl), control is transferred to the application program. However, the interrupt routine exists on the main memory 1.

〔Effect of the invention〕

As described above, according to the present invention, requests to the extended memory management program means for controlling the extended memory are centrally managed by the program management monitor means, and each application program is configured to be placed entirely on one extended memory. Therefore, it is possible to run each application program in parallel.

[Brief explanation of drawings]

FIG. 1 is a diagram of the operating principle of a program control method using expanded memory according to an embodiment of the present invention, FIG. 2 is a flowchart showing application program switching according to the embodiment, and FIG. 3 is a control according to a conventional example. It is a diagram of the operating principle of the system. In the figure, 1...main memory, 2...extended memory, 3...
Page frame, 4...Physical page, 5...Logical page, 6...EMM,? ...Program management monitor, 8...Program management table. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 2

Claims (1)

[Claims] A program control system for a personal computer includes an extended memory, an extended memory management program means for controlling the extended memory, and a program management monitor means for controlling execution of each application program on the extended memory. The extended memory is characterized in that, when transferring control to a program, the program management monitor means requests the extended memory management program means to associate a main memory with the extended memory in which the application program exists. Program control method.