JPH0376507B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an input/output device control method, and in particular to an input/output device and a method for writing data to the input/output device and/or writing data from the data input/output device. The present invention relates to an input/output control method that enables efficient disconnection control of input/output devices without using interrupt processing in a data processing system including a processing device that reads data.

[Conventional technology]

Figure 4 shows an example of the configuration of a data processing system. In the figure, 1 is a central processing unit (CPU), 2 is a main memory (MM), 3 is a common bus, and 4, 5... are input/output devices. be.

Central processing unit (CPU) 1 and main memory (MM)
2 cooperates to operate as a processing device,
Data is written to and/or read from the input/output devices 4, 5.

When a processing device (CPU, MM) requests an input/output device to perform a process such as reading/writing, it must check that the process is completed before proceeding with the next process such as reading/writing from the same input/output device. be. Conventionally, one of the following two methods has been used to check the completion of input/output devices.

A method of repeatedly checking the status of the same input/output device until it becomes complete, without performing any other processing, after once requesting the input/output device to perform a process.

A method in which, after requesting processing to an input/output device, it immediately moves on to other processing, and checks whether the status is complete using an interrupt raised by the same input/output device when the processing is completed.

FIG. 2 is a block diagram when the above method is used. In the figure, 10 is a processing device, 11 is an input/output device, 12 is an input/output request processing section, 13 is a status information check processing section, and 14 is a other processing parts,
15 is a status register that holds status.

FIG. 6 is an operational flow when the configuration shown in FIG. 2 is used.

Since FIGS. 2 and 6 are easily understood, detailed explanation will be omitted.

FIG. 3 is a block diagram when the above method is used. In the figure, the same numbers as those in FIG. 2 have the same names, 16 is a monitor call processing unit, and 17 is a monitor call completion process. 18 is a monitor section, 19 is an interrupt processing section, and 20 is an interrupt vector.

FIG. 7 is an operational flow when the configuration shown in FIG. 3 is used.

In FIG. 3, the processing device 10 is the input/output device 1
1, the monitor call processing unit 16 makes an inquiry to the monitor unit 18 in order to check whether the target input/output device 11 is available for use. When notified by the monitor unit 18 that “usage is available”, the input/output request processing unit 12 requests the input/output device 11 to perform processing. After this, processing device 1
When the value is 0, other processing becomes possible, and the other processing section 14 performs the operation. Thereafter, when the processing is completed by the input/output device 11, an input/output completion interrupt is input from the input/output device 11 to the processing device 10. In the processing device 10, the address information in the monitor is extracted from the area corresponding to the input/output device 11 in the interrupt vector 20, and thereby the interrupt processing section 19 in the monitor section 18 is activated. The interrupt processing section 19 checks the contents of the status register 15, and if it indicates a completed state, notifies the monitor call completion processing section 17 of this fact. Monitor call completion processing unit 1
At step 7, predetermined processing is performed, and all processing for the input/output device 11 is completed. Thereafter, when it becomes necessary to request processing to the input/output device 11, the same processing as described above is repeated.

[Problem that the invention seeks to solve]

The above method has the drawback that after a process is requested to the input/output device, other processing cannot be performed until the input/output device raises the status indicating completion, resulting in poor processing efficiency.

On the other hand, in the above method, after requesting processing to the input/output device, it is possible to move on to other processing, but there is a drawback that the memory capacity becomes large due to the provision of the interrupt vector 20 and the interrupt processing section 19. .

[Means for solving problems]

In order to solve the above points, the present invention provides an input/output device, a method for writing data to the input/output device, and/or an input/output device.
Or, in a data processing system including a processing device that reads data from the data input/output device, the processing device is provided with status information regarding the input/output device, and the status information indicates the operation of the input/output device. It is equipped with a status information check processing unit that performs repeated checking until a completion status is indicated, an input/output processing unit that performs processing of requesting input/output operations to the input/output device, and other processing units that perform other processing, Before requesting the input/output device to perform an input/output operation, the processing device checks whether the operation of the input/output device is completed using the status information check processing unit, and upon detecting the completion state. The input/output request processing unit requests input/output operations from the input/output device, and once the request has been completed, the input/output processing for the input/output device is terminated and the next processing is performed by another processing unit. It is characterized by being configured to perform.

[Effect]

When an input/output request occurs, the present invention issues an input/output processing request to the input/output device after checking the availability of the input/output device, and performs other processing without waiting for the completion of the operation of the input/output device. When the next input/output request occurs, the completion status of the previous input/output operation is checked before issuing an input/output processing request to the input/output device. Here, if the processing device requests input/output processing to an input/output device and the program uses the result of the input/output processing of that input/output device, it requests the same input/output processing again and It is also possible to wait for the end of the input/output processing request and use the results of the previous input/output processing. By doing so, the input/output device can be used efficiently with a small hardware configuration.

〔Example〕

FIG. 1 is a block diagram of one embodiment of the present invention, and in the figure, the same numbers as in FIGS. 2 and 3 have the same names. FIG. 5 is an operational flowchart of the embodiment illustrated in FIG.

First, when the processing device 10 requests processing to the input/output device 11, the status information check processing section 1
3 is activated. The status information check processing section 13 checks the contents of the status register 15, and if it indicates the completion of the operation, the input/output request processing section 1
Start 2. As a result, input/output request processing section 1
2 requests the input/output device 11 to perform processing. Then, when the processing request is completed, the processing device 10 becomes capable of performing other processing, and other processing units 14 perform operations.

On the other hand, even if the requested processing is completed, the input/output device 11 only sets the completed status in the status register 15 and does not interrupt the processing device 10. Then, when the next processing request to the input/output device 11 occurs in the processing device 10, the status information check processing section 13 is activated. The status information check processing section 13 checks the contents of the status register 15 as described above, and starts the input/output request processing section 12 if it indicates that the operation has been completed. Furthermore, if the previous processing has not finished and the contents of the status register 15 do not indicate completion of the operation, the status register 1
Check the contents of 5 repeatedly. When the completion of the operation is detected during this repeated check, the input/output request processing section 12 is activated. Thereafter, the same operations as described above are repeated.

Figures 8 and 9 show the program, control software,
This is an example of an input/output sequence chart shown at the hardware level, and FIG. 8 is an example of a chart of an embodiment of the present invention. In addition to issuing an output request 1, the program moves to another program without waiting for the completion of the operation of the relevant hardware, and the next time the program's input/output macro 2 occurs, it issues an input/output request to the hardware via the control software. This indicates that before issuing I/O request 2, the completion status of the previous I/O operation is checked and then I/O request 2 is issued. FIG. 9 is a chart example of the conventional example described above, and shows that the next program process is performed after waiting for the completion of processing of input/output request 1, and that input/output request 2 is performed after the completion of the processing. . As is clear from FIGS. 8 and 9, according to the present invention, the time-consuming process indicated by X can be performed in the program before the input/output request 1 is completed.

〔Effect of the invention〕

According to the present invention, an excellent effect is brought about in that input/output devices can be used efficiently without increasing hardware.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention;
2 and 3 are block diagrams of the conventional example, FIG. 4 is a configuration example of a data processing system, FIG. 5 is the operational flow of the embodiment, and FIG. 6 and 7 are the operational flow of the conventional example. FIG. 8 is an example of an input/output sequence chart of the embodiment, and FIG. 9 is an example of an input/output sequence chart of a conventional example. In the figure, 10 is a processing device, 11 is an input/output device, 1
2 is an input/output request processing section, 13 is a status information check processing section, and 14 is another processing section.

Claims (1)

[Claims] 1. In a data processing device system that includes an input/output device and a processing device that writes data to the input/output device and/or reads data from the data input/output device, the processing device has an A status information check processing unit that repeatedly checks status information regarding the input/output device until the status information indicates that the input/output device has completed its operation; and a status information check processing unit that requests the input/output device to perform input/output operations. The processing device includes an input/output request processing section and another processing section that performs other processing, and before requesting input/output operations to the input/output device, the processing device uses the status information check processing section to check the input/output operations. It is checked whether the operation of the device is completed or not, and when the completed state is detected, the input/output request processing unit requests the input/output device to perform the input/output operation, and when the request is completed, the input/output device is executed. 1. An input/output device control method, characterized in that the input/output device control method is configured such that the input/output processing related to the input/output processing is immediately terminated and the next processing is performed by another processing section.