公开(公告)号：AU9180182A

公开(公告)日：1983-08-11

申请号：AU9180182

申请日：1982-12-22

Applicant: IBM

Inventor： BURK JOHN LESLIE ,  BUTWELL JUSTIN RALPH ,  CLARK CARL EDWARD ,  RODELL JOHN TED ,  STUCKI DAVID EMMETT

IPC: G06F12/14 ,  G06F13/06

Abstract: This invention relates to the fetch protection of a critical area in the main storage of a data processing system. The critical area is a part of a main storage block protectable by a single storage protect key having a fetch protection field. To enable different fetch protections within a special storage block, fetch protect override controls are provided which partly override the normal operation of the storage protect key for a page located at a predetermined address. While fetch protection is set on for the page's storage block, the fetch protect override controls disable fetch protection for a portion of the page's addresses, e.g. addresses 0-2047. Override enablement is controlled by a fetch protect override control bit in a control register, e.g. bit 6 of control register 0.

公开(公告)号：DE2850416A1

公开(公告)日：1979-06-21

申请号：DE2850416

申请日：1978-11-21

Applicant: IBM

Inventor： COPE BERNHARD ,  LYNCH KENNETH ROBERT ,  O'DONNELL DANIEL HECTOR ,  RODELL JOHN TED ,  TURECHEK WILLIAM WALTER ,  UNTERBERGER ROBERT MARK

IPC: G06F11/14 ,  G06F1/24 ,  G06F9/445 ,  G06F13/00 ,  G06F3/04