JPH05128042A - Input/output control system - Google Patents

Abstract

PURPOSE:To provide an I/O control system unnecessecitating an area storing the connection existence information of respective I/O controllers and the judgement for the loading of a control program for each I/O controller in each execution of the program. CONSTITUTION:A pseudo program storage area 114 for artificially controlling I/O devices 115 to 117 is provided in a 2nd program storing means ROM106 storing a control program for controlling a channel device 102. When respective I/O controllers 103 to 105 are not connected yet, the pseudo program is transferred to corresponding transfer program storing means (RAMs) 108 to 110 to use it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output control system for controlling an input / output device, and more particularly to an input / output control system characterized by storing a control program.

[0002]

2. Description of the Related Art Generally, in a computer system, there is a significant difference between the processing speed of a processor or main storage device and the processing speed of an input / output device such as a floppy disk drive, hard disk drive or printer. Therefore, in order to operate the system efficiently in consideration of this difference in processing speed, there is known a computer system that entrusts control of input / output devices to channels. In such a system, the data transfer related to the input / output device is processed by the channel control rather than the processor control.

FIG. 3 is a block diagram showing an example of a conventional input / output control system for controlling an input / output device by a channel. Each input / output control device 1 is provided in the channel device 102.
I / O devices 115, 11 via 03, 104, 105
6, 117 are connected. Each of these input / output control devices 103, 104, 105 is connected to each input / output device 1
15, 116, 117 are controlled.

The channel device 102 is the system bus 1
It is connected to an external mechanism (not shown) via 01 and is controlled by this external device. A control processor 307 for controlling the entire device is built in the channel device 102, and a control program for this control processor 307 is stored in the ROM 306.

The control processor 307 detects the connection of each of the input / output control devices 103, 104 and 105 at the time of initialization, and stores the result of connection / non-connection in the internal register 314. When connected, each input / output control device 103, 104,
ROM 11 in which the control program in 105 is stored
Each of the input / output control devices 103, 104, 10 is read out from each of the control programs 1, 112, 113.
RAM 108, 1 in the channel device 102 corresponding to 5
09 and 110 respectively and store.

Each input / output control device 103, 104, 105
If is not connected, the unconnected information is stored in the internal register 314 and the control program is not transferred.

FIG. 4 shows an example of a connection information storage register using the internal register 314 in the control processor 307. The register 401 is used for each bit, and each input / output control device 103, 10 is connected to each bit.
The presence / absence of connections 4 and 105 is stored. Bit 402 becomes 1 when the input / output control device 103 is connected,
It becomes 0 when not connected. Similarly, bit 403 is input / output control device 104, and bit 404 is input / output control device 105.
It corresponds to each.

The main routine of the channel device 102 is all stored in the ROM 306, and when executing the control program of each input / output control device 103, 104, 105, each input / output control device 103, 104, 105. Control programs stored in advance and stored in the RAMs 108, 109, 110 corresponding to
Call it as a chin and control it.

FIG. 5 shows a flow chart when the control processor 307 of the channel device 102 is in operation. Here, for convenience, each input / output control device 103, 104, 1
05 will be referred to as port 1, port 2 and port 3, respectively.

The control processor 307 has internal registers 3
The presence or absence of port 1 is determined by 14 (step 50
1), the corresponding RAM 10 if port 1 is installed
The control program in 8 is subroutine-called (step 502). If it is not installed, the process proceeds to the next process (step 507).

Next, the presence or absence of port 2 is determined (step 5
03), if it is mounted, a subroutine call is executed (step 504), and if it is not mounted, the process proceeds to the next processing (step 508). If port 3 is also implemented in the same way, a subroutine call is performed (step 5).
05), if not mounted, the process proceeds to the next process (step 509). The control processor 307 repeats the above-mentioned processing, whereby the input / output control devices 103, 104, 1
05 operation control is performed.

[0012]

However, the above-mentioned conventional input / output control system requires an area in the control processor for storing information as to whether or not each input / output control device is connected to the channel device. In addition, each time the channel device executes the control program of each input / output control device during the operation of the control program, it is necessary to have a program step for determining whether or not the control program is mounted.

The present invention has been made to solve the above-mentioned problems, and does not require an area for storing the presence / absence information of the connection of each input / output control device, and provides a control program for each input / output control device. It is an object of the present invention to provide an input / output control system in which it is not necessary to determine the presence or absence of mounting each time it is executed.

[0014]

According to the input / output control system of the present invention, a pseudo program for pseudo-controlling an input / output device is provided in a storage means of a second program storing a control program for controlling a channel device. A program storage area is provided, and when each input / output control device is not connected, this pseudo program is transferred to the corresponding transfer program storage means for use.

[0015]

In the input / output control system of the present invention, when the connection confirmation means detects the connection of each input / output control device, the first
The control program from the program storage means is transferred to the corresponding transfer program storage means, and when the non-connection is detected, the second program and the pseudo program in the pseudo program storage area in the storage means are transferred to the corresponding transfer program storage means. Forward. Therefore, there is no need for an area for storing the presence / absence of the connection of the input / output control device, and there is a program step for determining the presence / absence of the installation each time the control program of the input / output control device is executed in the channel control program device. No longer needed.

[0016]

1 is a block diagram showing the configuration of an input / output control system according to an embodiment of the present invention. The same parts as those of the conventional system shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present invention, a pseudo program storage area 114 for storing a pseudo program to be described later is provided in the ROM 106 in which the control program for the channel device 102 is stored. The channel device 102 is a control processor 107
The control program is stored in the ROM 106. The control processor 107 determines whether or not each input / output control device 103, 104, 105 is connected at the time of initialization, and if connected, each input / output control device 103, 1
RO in which the control programs in 04 and 105 are stored
The control programs are read from the M111, 112, 113, and the RAMs 108, 109, 11 in the channel device 102 corresponding to the respective input / output control devices 103, 104, 105.
Transfer to 0.

Here, each input / output control device 103, 104,
When 105 is not connected, the pseudo program for controlling the input / output control device stored in the pseudo program storage area 114 in the ROM 106 is input to each input / output control device 103,
RAMs 108, 109, 11 corresponding to 104, 105
Transfer to 0.

The contents of the pseudo program for controlling the input / output control device are constructed in a subroutine format.
Only the instruction to return to the main routine is stored. The main routine of the channel device 102 is all R
Each input / output control device 10 stored in the OM 106
When executing the control programs of 3, 104, and 105, the programs stored in the ROMs 108, 109, and 110 corresponding to the input / output control devices 103, 104, and 105 are called as subroutines. I do.

FIG. 2 shows a flow chart when the control processor 107 of the channel device 102 is in operation. Here, for convenience, each input / output control device 103, 104, 1
05 will be referred to as port 1, port 2 and port 3, respectively. Control processor 107 of channel device 102
Performs the subroutine call of port 1 regardless of whether port 1 is mounted (step 201).
If the port 1 is installed, the control program transferred to the RAM 108 is executed.

When the port 1 is not mounted, the pseudo program has been transferred into the RAM 108, so that the main routine is immediately returned after calling the subroutine. The channel device 102 also performs the same processing for the control programs of the ports 2 and 3 (step 20).
2, 203). The control processor 107 repeats the above-mentioned processing, whereby each of the input / output control devices 103, 104,
The operation control of 105 is performed.

[0022]

As described above in detail based on the embodiments, in the present invention, it is not necessary to provide an area for storing the presence / absence information of the input / output control device in the control processor. Hardware resources can be reduced. In addition, the step of determining whether or not each input / output control device is mounted each time the channel device executes the control program becomes unnecessary. Therefore, the program steps when executing the control processor are shortened, and it is possible to provide an input / output control system that operates at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an input / output control system according to an embodiment of the present invention.

FIG. 2 is a flow chart during operation of a control processor of a channel device according to the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional input / output control system.

FIG. 4 is a diagram showing a storage state of an internal register in a control processor in a conventional control system.

FIG. 5 is a flowchart in the operation of the control processor of the channel device in the conventional system.

[Explanation of symbols]

 102 channel device 103, 104, 105 input / output control device 106 ROM 107 control processor 108, 109, 110 RAM 111, 112, 113 ROM 114 pseudo program storage area 115, 116, 117 input / output device

Claims (2)

[Claims] 1. A plurality of input / output devices, a plurality of input / output control devices which are provided corresponding to the respective input / output devices and control the respective input / output devices, and the input / output devices via the input / output control devices. A channel device for controlling an output device, wherein the input / output control device is provided with a first program storage means for storing a control program for controlling each of the corresponding input / output devices. The transfer program storage means for transferring and storing the control program stored in the first program storage means, and the connection confirmation means for detecting the presence / absence of connection between the channel device and the input / output control device. And a second program storage means for storing a control program for controlling the channel device, wherein the second program is provided. A storage area for a pseudo program for pseudo controlling the input / output device is provided in the system storage means, and when the connection confirmation means detects the connection of each input / output control device, the control program from the first program storage means is used. Transferring a program to the corresponding transfer program storing means, and transferring the pseudo program in the pseudo program storing area in the second program storing means to the corresponding transfer program storing means when a non-connection is detected. Characteristic input / output control system. 2. The input / output control system according to claim 1, wherein the first and second program storage means are constituted by a ROM, and the transfer program storage means is constituted by a RAM.