Patent · US Active

Dynamic address translation with fetch protection

US8082405B2 · kind B2 · utility

5Cited by

19References

28Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Dan F. Greiner · San Jose, US
Charles W. Gainey, Jr. · Poughkeepsie, US
Lisa C. Heller · Rhinebeck, US
Damian L. Osisek · Vestal, US
Erwin Pfeffer · Eppelheim, DE
Timothy J. Slegel · Staatsburg, US
Charles Webb · Solvang, US

Key dates

Filing date	Jan 11, 2008
Grant date	Dec 20, 2011
Priority date	—
Expiry date	Aug 25, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG06F12/1036
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

In an enhanced dynamic address translation facility a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are used to access a segment table entry containing a format control field and an access validity field. If the format control field is enabled, the segment table entry further contains an access control field and a fetch protection field and a segment-frame absolute address. Fetch operations from the desired block of data are permitted if the program access key associated with the virtual address is equal to the segment access control field.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.