JPH0367349A - Program loading system - Google Patents

Abstract

PURPOSE:To shorten the action starting time at restart without causing the break of a power supply by loading only a data part without loading a text part at restart of a system when a program is stored in a RAM. CONSTITUTION:A check sum means 410 checks whether the storage contents of a program of an external storage are broken or not. At the same time, a program presence/absence deciding part 210 decides whether the program of a RAM 300 is stored in a ROM 200 or not. Then the part 210 decides whether a program is stored in the RAM 300 or not at restart of a computer CPU 100 which is free from the break of the power supply. Then a text part is not loaded and only a data part is loaded after the check of the means 410 when a program is stored in the RAM 300. Then the loaded data part is inputted to the RAM 300 and stored there. Thus the action start time is shortened at restart.

Description

[Detailed Description of the Invention] [Summary] Regarding a program loading method for a computer system that loads and processes programs from an external storage device, this program loading method particularly shortens the operation start time when restarting the system without power interruption. A read-only memory, a random access memory in which programs and data are manually written from an external storage device that stores the programs and data according to instructions from the read-only memory, and execute c
In a computer system having pυ, a checksum means is provided in a program of an external storage device to check whether the stored contents of the program are not corrupted,
The read-only memory is provided with a program presence/absence determination unit that determines whether or not a program is stored in the random access memory. # When the computer system is restarted without interruption, the program presence/absence determining section determines whether or not the program is stored in the random access memory, and if the program is stored, the program is checked by a checksum means; When the program memory contents are not destroyed, only the data stored in the external storage device is input to the random access memory and stored.
There is.

[Industrial application field]

The present invention relates to an improvement in a program loading method for a computer system that loads and processes programs from an external storage device.

At this time, there is a particular need for a program loading method that shortens the operation start time when the system is restarted without power interruption.

[Conventional technology]

FIG. 6 is a block diagram showing the configuration of a conventional computer system 1.

In Figure 6, read-only memory (hereinafter referred to as ROM)
2 writes the entire program file from the disk device 4, which is an external storage device, to the random access memory (hereinafter referred to as RAM) 3, regardless of whether or not the power is turned off, and then writes the entire program file to the random access memory (hereinafter referred to as RAM) 3.
Then, data was read from RAM 3 and calculations were performed.

[Problem to be solved by the invention]

However, in the above-mentioned device configuration, the entire program file is loaded from the external storage device even when the system is restarted without power-off, so there is a problem that it takes time to load and delays the system's start time. there were.

Therefore, it is an object of the present invention to provide a program loading method that shortens the operation start time when restarting the system without particularly requiring power-off.

[Means to solve the problem]

The above problem is solved by the configuration of the device shown in FIG.

That is, in FIG. 1, there is a read-only memory 200 and a random access memory in which programs and data are input and written from an external storage device 400 that stores programs and data according to instructions from the read-only memory.
In a computer system having a memory 300 and a cpυ 100 for executing a program, 410 is a checksum means provided in the program in an external storage device to check whether the stored contents of the program have been corrupted.

Reference numeral 210 denotes a program presence/absence determining unit provided in the read-only memory and determining whether or not a program is stored in the random access memory.

And when restarting the computer system without power outage,
A program presence/absence determining section determines whether or not a program is stored in the random access memory, and if stored, the program is checked by a checksum means.

Further, when the stored contents of the program are not destroyed, only the data stored in the external storage device is inputted to and stored in the random access memory.

[For production]

In FIG. 1, when the computer system is restarted without a power outage, the program presence/absence determination unit 210 of the read-only memory 200 determines whether or not a program is stored in the random access memory 300. If so, the program is checked by checksum means 410.

Further, when the stored contents of the program are not destroyed, only the data stored in the external storage device 400 is input to the random access memory 300 and stored.

As a result, when the system is restarted when a program is stored in the random access memory 300, only the data is loaded without loading the program.
This makes it possible to shorten the startup time of the computer system (when restarting using the reset switch).

[Embodiment] FIG. 2 is a block diagram showing the tank bottom of an apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram showing a program file in the embodiment.

FIG. 4 shows the constituent countries of the RAM in the embodiment.

FIG. 5 is a flowchart explaining the operation of the embodiment.

The same reference numerals indicate the same objects throughout the figures.

In Figure 2, when starting up the computer system, first
The initialization processing program in 170M20 performs hardware initialization processing (see FIG. 5). Next ■R
The program presence section 21 (specifically, the program) provided in the OM 20 checks whether the text part (program) shown in FIG. 3 is stored in the IIIAM 30 (see FIG. 5). .

(2) When the text part (program) is not stored in the RAM 3 (at startup by turning on the power), the header information of the program file shown in FIG. 3 is read from the disk device 40 (see (2) in FIG. 5). Then, the program file is written into the RAM 30 according to the contents described in the header information (see FIG. 5).

Then, ■ When loading is completed, clear (initialize) the work area shown in Figure 4 (see Figure 5 ■), ■ Set the program presence/absence information of RAM 30 shown in Figure 4 to Yes. do. (Fixed pattern of several bytes (e.g. “01
234567”) (see Figure 5 ■).

Then, the program in the RAM 30 is activated by the loader processing program in the ROM 20 (see FIG. 5).

Also, ■', when a program is stored in the RAM 30 (if a fixed pattern (for example, "01234567") is read from the program presence/absence information area)
, the checksum of the text section (for example, adding the contents of the RAM 30) is checked by the command of the ROM 20, and when it is determined that the memory contents of the text section are not destroyed, the header information of the program file of the disk device 40 is checked. Read out (see Figure 5 ■).

Then, only the ■゛defective part is written into the RAM 30 (see Fig. 5■°).

On the other hand, if it is determined that the contents of the text section have been destroyed, the same process as when starting by turning on the power is performed, and the RA
Start the M30 program.

As a result, when the system is restarted when the program is stored in RAM, by loading only the data part without loading the text part, the system can be restarted without power interruption (when restarting with the reset switch). This makes it possible to shorten the time it takes for the system to start operating.

〔Effect of the invention〕

As explained above, according to the present invention, when a program exists in RALi, when the system is restarted, only the data part is loaded without loading the text part. This makes it possible to shorten the time it takes for the system to start operating (when rebooting using a switch).

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the present invention. Fig. 2 is a block diagram showing the tank bottom of the device according to the embodiment of the present invention. Fig. 3 is a diagram showing the program file in the embodiment. Fig. 4 is a RAM in the embodiment. FIG. 5 is a flowchart explaining the operation of the embodiment, and FIG. 6 is a block diagram showing the configuration of a conventional computer system. In the figure, 10 indicates a program presence/absence determining section, and 10 indicates a checksum means. A diagram showing the load of the uninvented embodiment.
31!1 JjEJlt diagram of RAM in the example 4.

Claims (1)

[Claims] A read-only memory (200), and a random access memory that inputs and writes programs and data from an external storage device (400) that stores programs and data according to instructions from the read-only memory. Memory (3
00) and a CPU (100) that executes the program, checksum means (410) for checking whether the stored contents of the program in the external storage device are not corrupted.
A program presence/absence determination unit (210) is provided in the read-only memory to determine whether a program is stored in the random access memory, and when the computer system is restarted without power interruption, The program presence/absence determining unit determines whether or not a program is stored in the random access memory, and if stored, the program is checked by the checksum means to determine whether the stored contents of the program are corrupted. If not, only the data stored in the external storage device will be accessed by the random access
A program loading method characterized by inputting data into memory and storing it.