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Prevention Of Unnecessary Machine Checks Caused By Reference And Change Bit Parity Errors

IP.com Disclosure Number: IPCOM000068089D
Original Publication Date: 1979-Nov-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Hogan, SG Werve, CE Wong, EC [+details]

Abstract

In many electronic data processing machines, Reference (R) and Change (C) bits are used to indicate the status of 2K pages of memory. Page-in and page-out selections are done according to the status of the R and C bits. For uniprocessor environments, detection of a parity error on these two bits causes a system damage machine check.