JPH02280233A - Memory management system - Google Patents

Abstract

PURPOSE:To restrict the extension of an interruption processing storage area and to release a main storage area to a controller by fixing an area to load an interruption processing procedure to the main storage area and managing the interruption processing storage area. CONSTITUTION:When each interruption processing procedure written to a fixed memory 2 is loaded in the specific area of a main storage means 3 by a system activation, a managing means 1 supervisorily manages the storage area acquiring condition of each interruption processing procedure loaded in the specific area of the main storage means 3, an inhibiting means 1 inhibits the extension of the specific area of the main storage means 3 based on the storage area acquiring condition to be managed and the extension of the specific area is restricted. Based on the storage area acquiring condition managed with the managing means 1, a reducing means 1 reduces the fixed area of the main storage means 3 and the work area of the main storage means 3 to a controller is secured. Thus, the extension of the storage area occupied with the interruption processing program or the like is braked.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an information processing device that processes information by loading a processing program that executes hardware interrupt or software interrupt processing onto a memory. The present invention relates to a memory management system that performs processing for loading processing programs into a computer.

[Conventional technology]

Conventionally, in an information processing device, various processing programs stored on a ROM are loaded onto a RAM, and a CPU performs interrupt processing based on various interrupt processing programs (handlers) loaded.

Performing data processing.

In this case, the above-mentioned handlers are usually kept in a resident state after being loaded onto the RAM.

On the other hand, application programs, etc., are generally deleted from memory when their operations are completed, or are relocated to a valid memory area on the system side to effectively utilize the limited memory to perform work processing. ing.

[Problem to be solved by the invention]

However, the above-mentioned interrupt processing program resides in a predetermined fixed area in RAM even when the program is executed without executing hardware or software interrupt processing, and to release this area, power must be shut off or system reset processing must be performed. It will not actually be released unless you run it and restart the system.

In addition, as program capacity increases, many handlers that are not used are resident in RAM, which limits the memory capacity required for program execution, resulting in a situation where the memory space necessary for program execution cannot be secured. There is a problem in that this tends to occur, making it impossible to use memory effectively.

This invention was made to solve the above problems, and by fixing the area for loading interrupt processing procedures into the main memory area and managing the interrupt processing storage area, it is possible to expand the interrupt processing storage area. The purpose of the present invention is to obtain a memory management system that can restrict and release a main memory area to a controller.

(Means for Solving the Problems) A memory management system according to the present invention includes a main storage means for storing work information of a controller, and a storage area acquisition state of each interrupt processing procedure loaded into a specific area of the main storage means. a control means for controlling expansion of a specific area of the main storage means based on the storage area acquisition state managed by the management means; A reduction means for reducing the fixed area of the storage means is provided.

[Effect]

In this invention, when each interrupt processing procedure written in the fixed memory is loaded into a specific area of the main storage means upon system startup, the management means stores each interrupt processing procedure to be loaded into the specific area of the main storage means. The area acquisition state is monitored and managed, and the prohibition means prohibits expansion of a specific area of the main storage means based on the managed storage area acquisition status, and limits expansion of the specific area. Then, the reduction means reduces the fixed area of the main storage means based on the storage area acquisition state managed by the management means, and secures a work area of the main storage means for the controller.

〔Example〕

FIG. 1 is a block diagram illustrating the configuration of a memory management system showing one embodiment of the present invention, and shows the case of an information processing device such as a computer device.

In the figure, 1 is a CPU, and ROM2 is a fixed memory.
Alternatively, each device connected to the system bus 7 is generally controlled based on an application program stored in the external storage device (FDD) 6. 3 is a RAM serving as a main storage means, which has a storage capacity of, for example, IM bits, and is configured so that the memory capacity can be further expanded.

4 is a keyboard (KBD) for inputting commands and data necessary for information processing. Reference numeral 5 denotes a CRT display device for displaying manually generated information and processing results.

Note that the CPUI uses the prohibition means, reduction means, and reduction means according to this invention.
It also serves as a management means, etc., and when each interrupt processing procedure written in the fixed memory is loaded into a specific area of the main storage means by system startup, the management means loads each interrupt processing procedure ( The RAM 3
The expansion of the specified area is prohibited, and the expansion of the specified area is restricted. Then, the reduction means reduces the fixed area of the RAM 3 based on the storage area acquisition state, and secures a work area of the main storage means for the controller.

FIG. 2 is a memory map configuration diagram illustrating the configuration of the RAM 3 shown in FIG. 1, and the same components as in FIG. 1 are given the same reference numerals.

In the figure, 31 is a specific area, for example, each interrupt processing procedure (interrupt processing program) loaded from ROM2.
Fixed storage areas 31a to 31d of A to D are provided and loaded under the control of the CPUI. A work area 32 rewritably stores flag information and data necessary for the CPUI to process notifications. Note that the flag information also stores an acquisition flag GF that prohibits acquisition of the fixed storage areas 31a to 31d.

In addition, the fixed storage area 31d stores an interrupt processing procedure C, which corresponds to an interrupt processing procedure that is deleted as necessary, and by this deletion processing, the main memory area is expanded and the CPU 1 Secure a work area.

Next, the memory area management processing operation according to the present invention will be explained with reference to FIG.

FIG. 3 is a flowchart illustrating an example of a memory area management processing procedure according to the present invention. In addition, (1) to (1
3) shows each step.

First, the CPU 1 starts up the system, performs other accompanying startup processing, and then sets an acquisition flag GF (GEFFLAG) that indicates whether acquisition of fixed memory (specific area 31 of RAM 3) is permitted. Set it to "0" and also set the area that stores the total size of fixed memory to "0" (
1) Next, when a command is input (2), it analyzes the manually input command and determines whether it is a command (issued by an internal command) that instructs to acquire fixed memory. 3) If YES Current acquisition flag GF
4) If it is No, that is, there was a command that issued a command that made it impossible to obtain, so return an error and go to step (8) (2). return.

On the other hand, if YES in step (4), refer to the memory capacity value (held in RAM3) that indicates whether the requested size can be secured. 6) If no, proceed to step (8); if YES, secure fixed memory, increase the fixed memory size by the specified amount, and memorize the interrupt program that performs the requested processing procedure7) ,
Update the memory capacity value and return to step (2).

On the other hand, if the judgment in step (3) is NO, it is necessary to judge whether it is an internal command indicating that fixed memory acquisition is not possible9)
If YES, proceed to step (12), set the acquisition flag GF to "1", and return to step (2).

On the other hand, if the judgment in step (9) is No, it is determined whether this is an internal command to reduce the storage area of the fixed memory (10), and if it is YES, the fixed memory size is reduced and updated (11), step (2) Return to

On the other hand, if NO in step (10), normal program loading and startup processing will be executed.
).

Note that there is a single program that issues only the internal commands for not being able to acquire fixed memory or for reducing fixed memory.For example, if there are four interrupt processing programs A to D, and only interrupt processing program C is scheduled to be deleted. Then, first, the interrupt processing programs A, B, and D are loaded into the fixed storage areas 31a to 31c, and then a program that issues a message indicating that fixed memory acquisition is not possible is activated. This makes it impossible to load other handlers (interrupt processing program group). If another handler that follows interrupt processing program C is loaded, when a program that issues fixed memory reduction is started, another interrupt processing program is loaded, and then issues fixed memory reduction. When a program is started, another interrupt processing program after interrupt processing program C is started.
It will be deleted from AM3. Therefore, the acquisition flag GF indicating that the fixed memory cannot be acquired is used to prohibit backward program loading of the interrupt processing program C, thereby preventing the occurrence of a system error.

Also, when the application that uses the interrupt processing program C is executed and finished, a fixed memory reduction program is started to reduce the memory area by the size of the interrupt processing program C, and the work area of RAM3 is expanded.
The interrupt processing programs A, B, and D are left in the RAM 3, and the work area is released for application execution.

〔Effect of the invention〕

As explained above, the present invention includes a main storage means for storing work information of a controller, a management means for managing the storage area acquisition state of the 8 interrupt processing procedure loaded into a specific area of the main storage means, and Prohibition means for prohibiting expansion of a specific area of the main storage means based on the storage area acquisition status managed by the management means, and reduction means for reducing the fixed area of the main storage means based on the storage area acquisition status managed by the management means. Since the above means is provided, the interrupt processing program load area can be fixed to a specific area, so that expansion of the storage area occupied by the interrupt processing program, etc. can be stopped.

Furthermore, the storage capacity of the main storage means can be expanded at any time by deleting unnecessary interrupt processing programs from a specific area. Therefore, excellent effects such as being able to start up and start an application with a large program capacity at any time without performing reprocessing such as system reset are achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of a memory management system showing an embodiment of the present invention, FIG. 2 is a memory map configuration diagram illustrating the configuration of the RAM shown in FIG. 1, and FIG. 12 is a flowchart illustrating an example of a memory area management processing procedure according to FIG. In the figure, 1 is a CPU, 2 is a ROM, and 3 is a RAM. 4 is a keyboard, 5 is a CRT display device, 6 is an external storage device, and 7 is a system bus. Funeral map? Figure 42

Claims (1)

[Claims] In an information processing apparatus having a controller that processes interrupt requests of an input/output device according to a plurality of interrupt processing procedures written in a fixed memory, a main memory means for storing work information of the controller, and a specific area of the main memory means. a management means for managing the storage area acquisition state of each interrupt processing procedure to be loaded; a prohibition means for prohibiting expansion of a specific area of the main storage means based on the storage area acquisition state managed by the management means; A memory management system comprising: a reduction means for reducing a fixed area of the main storage means based on a storage area acquisition state managed by the means.