Browse Prior Art Database

Flush I/O Configuration Command

IP.com Disclosure Number: IPCOM000108909D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Cwiakala, R: AUTHOR [+2]

Abstract

A method for a system control program to synchronize the hardware configuration definition with the software configuration definition is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 59% of the total text.

Flush I/O Configuration Command

       A method for a system control program to synchronize the
hardware configuration definition with the software configuration
definition is disclosed.

      A new instruction, DELETE I/O CONFIGURATION, is disclosed that
will allow the software to "delete" the current I/O configuration
definition contained in the system area.  The Delete I/O
Configuration command has the following properties:
      -    The instruction executes synchronously.
      -    Upon completion, all I/O components are undefined to the
channel subsystem.

      During system initialization, the software determines if the
I/O configuration definition contained in the system area matches the
I/O configuration contained in an I/O Definition File.  If the
definitions do not match, the installation is given the option to set
the hardware I/O configuration definition match to software I/O
configuration definition.  If the installation chooses to have the
definitions synchronized, the software saves the contents of the I/O
definition file into memory and issues the Delete I/O Configuration
command.  Then, using the I/O configuration description in memory,
the software dynamically builds the corresponding I/O configuration
definition into the system area.

      The logic that the operating system will use during IPL is as
follows:
      IF Hardware configuration  = any I/O definition file I/O
configuration definition THEN
    ...