JPH04239927A - Input/output subsystem - Google Patents

Abstract

PURPOSE:To set free physical connection relations to peripheral devices and to change the priority levels of processing requests only with the change of contents of a table. CONSTITUTION:Peculiar device IDs are given to peripheral devices 41 to 4n respectively; and when peripheral devices 41 to 4n are started, an input/output controller 1 detects the device IDs of peripheral devices 41 to 4n and compares them with preliminarily set held contents of a connected peripheral device table 3, and devices whose device IDs do not coincide with these held contents are made unavailable.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to input/output subsystems.

0002

[Prior Art] A conventional input/output subsystem maintains connection information for each peripheral device on a connected peripheral device table managed by software, and when an OS is started, software collects information on each peripheral device and stores it in the table. A method is used to check with the above information and decide whether each device can be connected.

0003

[Problems to be Solved by the Invention] In the conventional input/output subsystem described above, the physical connection relationship between peripheral devices and input/output devices must be managed by software, and the input/output that corresponds to the connected peripheral device table is Since the ports of the device are fixed, there is a problem that if a peripheral device is connected to another port by mistake, it becomes unusable.

Another problem is that once the configuration is determined, the priority order of each port is fixed, so the priority order of processing between each device cannot be changed without changing the physical connections.

[0005]

Means for Solving the Problems The input/output subsystem of the present invention provides each peripheral device with a unique device ID, and when the peripheral device is started up, the input/output control device receives the device ID from each peripheral device. , a connected peripheral device table set in advance, and a means for comparing the contents held in the connected peripheral device table with the device ID and disabling a device that does not match. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows one embodiment of the present invention.

Reference numeral 1 denotes an input/output control device, which internally has a processing request priority allocation circuit 2 and a connected peripheral device table 3. 41 to 4n are peripheral devices connected to the input/output control device 1, and each device has a unique ID.

The input/output control device 1 collects ID information of each peripheral device when the device is started up. The collected ID information of each peripheral device is stored in the connected peripheral device table 3 in the input/output control unit.
Peripheral devices for which discrepancies are detected are compared with the contents held by
It is considered unusable.

Furthermore, the physical channel number shown in the connected peripheral device table 3 is notified to each peripheral device, and also to the processing request priority allocation circuit 2. The processing request priority allocation circuit 2 allocates the processing request priority of each peripheral processing device according to the notified physical channel order.

[0011]

As described above, the input/output subsystem of the present invention has the effect of freeing the physical connection relationship of peripheral devices and also allowing the priority order of processing requests to be changed simply by changing the contents of the table.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

1 Input/output control device 2 Processing request priority allocation circuit 3 Connected peripheral device table 41~4n Peripheral equipment

Claims (3)

[Claims] Claim 1: Give each peripheral device a unique device ID;
Means for the input/output control device to detect the device ID from each of the peripheral devices when starting up the peripheral device, a connected peripheral device table set in advance, the contents held in the connected peripheral device table, and the device ID. an input/output subsystem characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem is characterized in that the input/output subsystem has a means for comparing the apparatuses; 2. The connection physical channel number of each peripheral device is held in the connected peripheral device table, and the physical channel number is assigned to each peripheral device according to the device ID detected from each peripheral device and the connected physical channel number. 2. The input/output subsystem of claim 1, further comprising means for assigning numbers. 3. The input/output subsystem according to claim 2, further comprising means for assigning priorities of processing requests from each peripheral device to the input/output control device according to the assigned order of the physical channel numbers. .