JPH04165553A - Input/output controller - Google Patents

Abstract

PURPOSE:To improve the processing efficiency of a central processing unit by controlling indirectly plural input/output devices by using one control program. CONSTITUTION:An input/output device designating means outputs simple address data and designates one piece of input/output device from in plural input/output devices, and a storage means 2 stores its address data. An address converting means 3 retrieves the storage means 2 with respect to the simple address data outputted from the input/output device designating means 1, reads out prescribed address data for designating the corresponding input/output device and outputs it to the corresponding input/output device. In such a way, plural input/output devices are controlled by one piece of device driver, and also, the input/output device can be accessed without passing through a CPU, and the processing efficiency of a central processing unit is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an input/output control device that has a plurality of input/output devices and executes one control program using virtual memory processing.

L Overview] In computers, individual device drivers are built for input/output devices to directly access them.

However, it is necessary to build a new driver for a new input/output device, and since direct access is performed every time an input/output request is made, there is a problem that the processing of the central processing unit is interrupted for a long time. have.

The present invention uses one control program to indirectly control a plurality of input/output devices. As a result, only one device driver is required at all times, and the processing efficiency of the central processing unit is improved.

Conventionally, in office computers and personal computers, control of input/output devices, which was performed by a CPU (central processing unit) 41, is performed by a main memory (main storage device), as shown in FIG. For programs on 42, MMtJ (Memory Menagem
It is accessed indirectly by converting the logical address from the CPU 41 into a physical address on the main storage device through the CRT (Cathode Ray Tube Display) 43,
For the hard disk storage device) 45, FDD (floppy disk storage device) 46, MT (magnetic tape storage device) 47, etc., individual device drivers (input/output device control programs) corresponding to each input/output device are required. The CPU 41 directly instructs the address and accesses it.

To explain this in more detail, the above-mentioned CRT 44,D
To access input/output devices such as the ISK 45, a driver shown in FIG. 5 is constructed, and each input/output device is accessed based on address data from the CPU 41. For example, C.R.
In the case of T44, CRT for accessing CRT44
Build a driver 51 for the CPU 4.
CRT driver 5 by directly addressing from 1
1 display program is running. Also, DISK4
5, build a DISK driver 52 and use C
The PU 41 directly specifies the address and executes the process of reading file data from the DISK driver 52, for example.

That is, the process of displaying predetermined data on the CRT 44 and the DI of the execution of the main program on the main memory 42
SK45. FDD4.6. When data read processing from the MT 47 or the like occurs, the CPU 41 outputs address data such as "FO80XX" to access various input/output devices.

[Problem to be Solved by the Invention 1] As mentioned above, in the conventional control method for input/output devices by personal computers, etc., 10 addresses are set for each input/output device, and each IO address is set to 10 addresses. A corresponding device driver is prepared. For this reason, for example, a mouse (
When a new input device (type of input device) is newly installed, it is necessary to set an IO address for the device and at the same time develop a device driver corresponding to the IO address. Also, when running a predetermined main program, C
Every time there is an access request from an input/output control device such as RT44, the CPU 41 sends the address data “FO80” as described above.
XX”, “FO81X-”, etc. must be output.

If you look at it, you can configure the driver for the input/output device with one, and use C
If it is possible to access an input/output device such as a CRT using the MMU itself without going through the PU, the number of device drivers can be reduced, and it is thought that the program processing time can also be reduced.

An object of the present invention is to control a plurality of input/output devices with a single device driver and to be able to access the input/output devices without using a CPU.

[Means to solve the problem] The means of the present invention are as follows.

The input/output device specifying means 1 (see the functional block diagram of FIG. 1, the same applies hereinafter) outputs simple address data to specify one input/output device from among a plurality of input/output devices.

The storage means 2 stores address data of a predetermined input/output device with respect to the simple address data.

The address conversion means 3 searches the storage means 2 for the simple address data outputted from the input/output device specifying means 1, reads out predetermined address data designated by the corresponding input/output device, and reads out the corresponding input/output device. Output to.

[For production] The operation of the means of the invention is as follows.

First, when the CPU of the computer accesses an input/output device, or when there is an access request for the input/output device that is output during the execution of the main program, the input/output device specifying means 1 specifies, for example, the machine number of the input/output device to be addressed. Simple and simple address data is output. Then, the address conversion means 3 searches the storage means 2 based on the simple address data, reads out the address data specifying the input/output device corresponding to the simple address data, and reads out the read address data. is output.

For example, when the CPU accesses a floppy disk device, the machine number of the floppy disk device (
For example, "1") is output as simple address data by the input/output device specifying means 1, and based on the output simple address data "1", a floppy disk device is stored corresponding to that "1". address, for example, [#FO82XXJ, is read out from the storage means 2, and the address conversion means 3 converts the simple address data rl
J is converted into the read r#FO82XXJ and output.

This allows the floppy disk device to
The floppy disk device is controlled based on the address data converted and outputted by the address conversion means 3 without going through U, for example, the address designation of [#FO82XXJ. In this way, the same process as described above is performed for other input/output devices, and a plurality of input/output devices can be controlled.

Therefore, a plurality of input/output devices can be controlled by one device driver, and the input/output devices can be accessed without going through the CPU.

[Example] An example will be described below with reference to FIGS. 2 and 3.

FIG. 2 is a system configuration diagram of one embodiment.

The CPU 1 shown in the figure is composed of a microprocessor, and controls the entire system by various programs such as a main program stored in the main memory 12. When performing input/output control related to reading or saving of programs and data on the main memory 12, access is performed using logical addresses, and when performing input/output control for other input/output devices, input/output control is performed. The machine number of the input/output device is stored in the DNR 18, which is a device number register, and then accessed using one predetermined simple physical address, for example, $FOOOXX. Then, control is passed to the MMU 13. MMU13 is the above CP
If the address accessed from U11 is a logical address, it is converted to a physical address on the main memory 12, while a predetermined address space $FOO is set in advance.
If it is OXX, based on the device number stored in the DNR 18, it is converted into an address corresponding to each input/output device by referring to a machine number table (not shown) in the main memory 12.

CRT 14 in FIG. DISK15. FDDI6, MT
17 and the like are the same input/output devices as those explained in FIG. 4, and are accessed by the above-mentioned converted addresses.

Next, the main parts will be explained using FIG. 3. Above CPUI
Access to each input/output device by I is accomplished by calling a single device driver 19 residing on main memory 12.

A single device driver 19 performs all control by accessing a single address $FOOOXX.

When this single address $FOOOXX is accessed, if the data stored in DNR, 18 is the machine number "0" of the CRT 14, then the flower address $F000XX is stored in $FO80XX and in DNRI 8. If the data is the machine number rlJ of DISK15, $FO81X
The data stored in X and DNR18 is
If the machine number of D16 is "2", it will be $FO82XX, MMU
13 and output. Each of the converted addresses is an address of an input/output device corresponding to the machine number, and the address is accessed to control each input/output device.

In this case, the program for controlling the input/output control device is based on the program stored in the corresponding device driver in the main memory 12.

[Effects of the Invention] According to the present invention, an input/output device is controlled using a single driver, and an MMU or the like directly outputs predetermined address data from simple address data without outputting predetermined address data from the CPU. can be output to the input/output device.

Therefore, efficient program processing can be executed.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of the present invention, Fig. 2 is a system configuration diagram of an embodiment, Fig. 3 is a diagram explaining the main parts thereof, and Fig. 4 is a diagram showing how a conventional computer system handles multiple input/output devices. FIG. 5, which is a diagram for explaining control, is a diagram showing an example of the arrangement of device drivers existing on the main memory. l...I/O device designation means, 2...Storage means, 3...Address conversion means. Patent Applicant: Casio Computer Co., Ltd. Moe Kimu [Nohe 12θ28

Claims (1)

[Claims] input/output device specifying means for outputting simple address data to specify one input/output device among the plurality of input/output devices;
a storage means for storing address data specifying a predetermined input/output device for the simple address data; and a corresponding input/output device that searches the storage means for the simple address data output from the input/output device designation means. An input/output control device comprising: address conversion means for reading specified predetermined address data and outputting it to a corresponding input/output device.