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Determination of Amount of Real Main Storage During System Control Program Initialization

IP.com Disclosure Number: IPCOM000050355D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Moore, BB: AUTHOR [+5]

Abstract

During initialization of the system control program (SCP), subsequent to the hardware IPL (Initial Program Load) process, a request is issued to a maintenance and service support facility (MSSF). The MSSF responds to the request by providing a STORAGE ADDRESS RANGE parameter. This parameter, given in units of megabytes, defines the installed high real storage value for the complex. During initialization this value is used to build system control blocks which represent all real storage.

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Determination of Amount of Real Main Storage During System Control Program Initialization

During initialization of the system control program (SCP), subsequent to the hardware IPL (Initial Program Load) process, a request is issued to a maintenance and service support facility (MSSF). The MSSF responds to the request by providing a STORAGE ADDRESS RANGE parameter. This parameter, given in units of megabytes, defines the installed high real storage value for the complex. During initialization this value is used to build system control blocks which represent all real storage.

With this facility, the SCP does not require an installation parameter to be specified at software system generation (SYSGEN) time. It does not require that storage be physically online to determine the high address value. Furthermore, the SCP does not have to test storage to the architected limit.

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