JPH0378067A - Peripheral device control system - Google Patents

Abstract

PURPOSE:To reduce a load on a CPU by providing a table to register channel programs where detailed operation indications to a peripheral device are listed is registered and outputting table addresses to a peripheral device controller. CONSTITUTION:When the factor of the actuation of the peripheral device is generated, a channel program updating means 120 prepares all channel programs 150, a channel program registering means 110 prepares the channel program registration table 140, and table addresses are outputted to the peripheral device controller 200 through a bus 300 with a channel program registration instruction. Further, the updating means 120 actuates a channel program use permission informing means 130 unless there is a usable program 150 when the registration table 140 is updated, and then informs a channel program control means 220 that there is the usable program when the program becomes usable. This constitution reduces the number of input/output instructions for the controller 200 to reduce the load on the CPU 100 and also improves the efficiency of the processing of the controller 200.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a peripheral device control method for an electronic computer comprising a central processing unit and a peripheral device control device, and in particular,
The present invention relates to a peripheral device control method suitable for use in electronic computers that perform a large proportion of input/output processing because this method can significantly reduce the number of executed input/output instructions.

BACKGROUND OF THE INVENTION Conventionally, in this type of peripheral device control system, a channel program is created every time an operating factor for a peripheral device occurs, and a channel program address is output by an input/output command each time.

The peripheral device control device sequentially reads this channel program and controls the peripheral devices according to the instructions.

Problems to be Solved by the Invention The conventional peripheral device control method described above has the following drawbacks.

(1) Since an input/output command is executed every time an operation factor for the second peripheral device occurs, the processing capacity of the central processing unit is strained.

-m, the execution of an input/output instruction requires an extremely long execution time compared to other instructions since it includes bus acquisition/release and peripheral device controller operation time.

(2> When issuing the next I/O request after completing one input/output operation, the central processing unit may not be able to issue the next I/O request immediately due to processing reasons. Even if there is a margin, it will not work and efficient processing will not be possible.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel peripheral device control method that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, a peripheral device control method according to the present invention provides a method for enumerating detailed operation instructions for peripheral devices in an electronic computer constituted by a central processing unit and a peripheral device control device. a channel program registration tail for registering the channel program that has been created, a channel program output means for outputting this table address to the peripheral device control device, and a channel program update means for updating the contents of the channel program and updating the channel program usage permission/prohibition flag. and channel program use permission notifying means for notifying when all channel programs become unusable and become usable again; A command analysis means for analyzing commands, a channel program management means for reading usable channel programs from the central processing unit based on a channel program management table indicating the channel program to be processed next, and a channel for analyzing and processing the channel programs. and a program processing means.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a peripheral device control method according to the present invention.

Referring to FIG. 1, the peripheral device control system according to the present invention includes a peripheral device control device 200 connected to a central processing unit 100 via a bus 300.

The central processing unit 100 includes channel program registration means 1
10, channel program update means 120, channel program usage permission notification means 130, channel program registration table 140, and one or more channel programs 150.

Peripheral device control device 200 is composed of command analysis means 210, channel program management means 220, channel program processing means 230, and channel program management table 240.

Next, the overall operation of an embodiment according to the present invention will be described.

When a peripheral device activation factor occurs, the channel program update means 120 is activated first. The channel program update means 120 updates all channel programs 150.
and starts the channel program registration means 110.

Channel program registration means 110 creates channel program registration table 1 based on channel program 150.
40, and the table address is sent to the peripheral device controller 2 via the bus 300 by a channel program registration command.
Output to 00.

In the peripheral device control device 200, a command analysis unit 210 analyzes the command. If it is a channel program registration command,
Initial values are set in the channel program management table 240. Subsequently, the channel program management means 220 is activated.

Channel program management means 220 determines whether or not the current channel program can be used by referring to channel program registration table 140. If available, the channel program 150 is read and the channel program processing means 230 is activated. At the same time, the channel program management table 240 is updated. If the use is prohibited, it waits to receive a use permission notification from the channel program use permission notification means 130 of the central processing unit 100.

Channel program processing means 230 processes each command of channel program 150. When the processing is completed, an interrupt is generated to the channel program update means 120 of the central processing unit 100 via the bus 300.

At the same time, the channel program management means 220 is activated to prepare for the next process.

The channel program update means 120 performs post-interrupt processing and also updates the channel program 150 and the channel program registration table 14 in order to prepare for the next input/output processing.
Update 0.

When updating the channel program registration table 140, the channel program updating means 120 activates the channel program use permission notification means 130 if there is no currently usable channel program 150.

The channel program use permission notification means 130 notifies the channel program management means 220 that a usable channel program 150 has been generated.

FIG. 2 shows a specific example of the channel program registration table 140 in the central processing unit f100 in FIG.

Referring to FIG. 2, the channel program registration table 140 includes a registered number 141, a valid number 142, a current channel program number 143, a channel program usage permission/prohibition flag 144, and a channel program pointer 145.

The number of registrations 141 is the channel program registration table 14
0 indicates the total number of registered channel programs, the effective number 142 indicates the number of currently usable channel programs, and the current channel program number 143 indicates the relative position of the channel 10 grams to be processed next. The order of use is the order of registration in the table, and the first channel program follows the lf& channel program. A channel program use permission/prohibition flag 144 indicates whether the corresponding channel program is used in the order in which it is used, and a channel program pointer 145 indicates the address of the channel program currently in use.

FIG. 3 shows a specific example of the channel program management table 240 in the peripheral device control device 200 in FIG.

Referring to FIG. 3, the channel program management table 240 includes the number of registrations 241, the current channel program number 242, and the channel program pointer 243.
This is a table that manages channel programs within the peripheral device control device 200.

The number of registrations 241 is the channel 10gram registration table 24
A current channel program number 242 indicating the total number of channel programs registered as 0 indicates the relative position of the channel program to be processed next.A channel program pointer 243 indicates the address of the channel program currently in use.

FIG. 4 shows input/output instructions and interrupt operations in a conventional peripheral device control system.

FIG. 5 shows input/output instructions and interrupt operations in the present invention. As shown in FIG. 5, there are significantly fewer input/output instructions than in FIG. 4.

As described in detail, according to the present invention, the number of input/output instructions to the peripheral device control device can be reduced, so that the excellent effect of reducing the load on the central processing unit can be obtained. Further, in the peripheral device control device, input/output processing can be performed regardless of the operating status of the central processing unit, and processing efficiency can be improved. Furthermore, from the above, it is possible to flexibly respond to sudden occurrences of input/output data.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of a peripheral device control method according to the present invention. FIG. 2 is a diagram showing a specific example of the channel program registration table in FIG. 1. FIG. 3 is a diagram showing a specific example of the channel program management table in FIG. 1. FIG. 4 is a diagram showing input/output instructions and interrupt operations in a conventional peripheral device control system. FIG. 5 is a diagram showing input/output commands and interrupt operations in the control system according to the present invention. 100...Central processing unit, 110...Channel program registration means, 120...Channel program update means, 130...Channel program use permission notification means, 140...Channel program registration table, 1
41...Number of registered items, 142...Valid number, 143...
- Current channel program number, 144...Channel program use enable/disable flag, 145...Channel program pointer, 150...Channel program, 200...Peripheral device control device, 210...Instruction analysis means, 220...Channel program analysis means, 230...Channel program processing means, 240.
... Channel 10-gram management table, 241 ... Number of registrations, 242 ... Current channel program number, 243 ... Channel program pointer, 300 ...
··bus

Claims (1)

[Scope of Claims] In an electronic computer configured by a central processing unit and a peripheral device control device, a channel program registration tail that registers a channel program listing detailed operation instructions for peripheral devices;
A channel program output means that outputs this table address to the peripheral device control device, a channel program update means that updates the contents of the channel program and updates the channel program use enable/disable flag, and temporarily disables all channel programs. Then,
a channel program use permission notification means for notifying the user when the channel program becomes available for use; a command analysis means for analyzing the command transferred to the bus by the channel program registration means in the peripheral device control device; A channel program management means for reading usable channel programs from the central processing unit based on a channel program management table indicating the channel programs to be used, and a channel program processing means for analyzing and processing the channel programs. Peripheral device control method.