JP3227520B2 - I / O control system - Google Patents

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 remarkable difference between the processing speed of a processor or a main storage device and the processing speed of an input / output device such as a floppy disk drive, a hard disk drive, or a printer. Therefore, in order to operate the system efficiently in consideration of the difference in the processing speed, a computer system that assigns control of an input / output device to a channel is known. In such a system, the data transfer related to the input / output device is processed not by the processor but by the channel 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
03, 104, 105
6, 117 are connected. Each of these input / output control devices 103, 104, 105 is
15, 116 and 117 are controlled.

The channel device 102 is connected to the system bus 1
01 is connected to an external mechanism (not shown), 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 of the 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, 105 at the time of initialization, and stores the result of the presence or absence of the connection in the internal register 314. When connected, the input / output control devices 103, 104,
ROM 11 storing the control program in 105
1, 112, and 113, read out the respective control programs, and input / output control devices 103, 104, 10
RAM 108, 1 in the channel device 102 corresponding to
09 and 110 respectively.

Each input / output control device 103, 104, 105
Is not connected, the information of the unconnection is stored in the internal register 314, and the transfer of the control program is not performed.

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

All the main routines of the channel device 102 are stored in the ROM 306. When the control programs of the input / output control devices 103, 104 and 105 are executed, the input / output control devices 103, 104 and 105 are executed. The control programs previously transferred and stored in the RAMs 108, 109 and 110 corresponding to
Performs control by calling it as a chin.

FIG. 5 shows a flow chart when the control processor 307 of the channel device 102 operates. 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 an internal register 3
14 to determine whether there is a port 1 (step 50).
1) If the port 1 is mounted, the corresponding RAM 10
A subroutine call is made to the control program in step 8 (step 502). If not, the process proceeds to the next process (step 507).

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

[0012]

However, the above-described conventional input / output control system requires an area in the control processor for storing information as to whether each input / output control device is connected to the channel device. Furthermore, each time the channel device executes the control program of each input / output control device during the operation of the control program, a program step for determining whether or not the channel device is installed is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not require an area for storing information on the presence / absence of connection of each input / output control device. It is an object of the present invention to provide an input / output control system that does not need to determine the presence / absence of implementation every time the execution is performed.

[0014]

SUMMARY OF THE INVENTION An input / output control system according to the present invention includes a pseudo program for pseudo-controlling an input / output device in a storage means of a second program storing a control program for controlling a channel device. A storage area for a program is provided, and when each input / output control device is not connected, this pseudo program is transferred to a corresponding transfer program storage means and used.

[0015]

In the input / output control system according to the present invention, when the connection confirmation means detects the connection of each input / output control device, the first connection is established.
The control program from the program storage means is transferred to the corresponding transfer program storage means, and when the disconnection 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 the program step for determining whether or not the input / output control device is mounted every time the control program of each input / output control device is executed in the channel control program device No longer needed.

[0016]

FIG. 1 is a block diagram showing the configuration of an input / output control system according to an embodiment of the present invention. The same components as those of the conventional system shown in FIG. 3 are denoted 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 described later is provided in the ROM 106 in which a 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 of the input / output control devices 103, 104, and 105 is connected at the time of initialization.
RO in which the control programs in the storage units 04 and 105 are stored
The control programs are read from the M111, 112, and 113, and the RAMs 108, 109, and 11 in the channel device 102 corresponding to the input / output control devices 103, 104, and 105, respectively.
Transfer to 0.

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

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

FIG. 2 is a flowchart showing the operation of the control processor 107 of the channel device 102 during 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 a subroutine call for port 1 irrespective of whether port 1 is implemented (step 201).
If the port 1 is mounted, the control program transferred to the RAM 108 is executed.

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

[0022]

The above has been described in detail based on the embodiments.
As the present inventionAccording to the following excellent effects are obtained
Be. Area for storing information on the presence or absence of connection of the I / O controller
AreaChannel deviceIt cannot be installed in the control processor.
As a result, hardware resources can be reduced.
Each time the channel device executes the control program,
Step of determining whether or not each input / output control device is mounted every time
Is no longer required. For this reason, the process when executing the control processor
Input / output control that operates at high speed with reduced gram steps
It becomes possible to provide a system.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing the operation of the control processor of the 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 showing the operation of a control processor of a channel device in a 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)

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