The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1997
Filed:
Dec. 08, 1993
Todd Andrew Gilbertsen, Rochester, MN (US);
Stephen Arthur Knight, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A tracing technique is disclosed for an application program that is only permitted to access virtual storage, not physical storage, via a Protect Mode Addressing scheme. The application program contains an initialization statement that initializes a trace address T1 to be equal to a virtual address V1 contained in a data area under the control of the application program. A statement in the application program then requests a pinned virtual address V2 that maps to a predetermined physical address P from a device driver. If the device driver exists, the trace address T1=virtual address V2. A memory mapper maps address V2 to physical address P and writes the information to physical address P. A conventional logic analyzer monitors the bus for any writes to physical address P and captures the contents of the bus upon the detection of this condition.