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. 06, 1994
Filed:
Apr. 26, 1994
Alan J Schiffleger, Chippewa Falls, WI (US);
Cray Research, Inc., Eagan, MN (US);
Abstract
A method of implementing a privileged instruction that enables the development of new operating systems in user mode. The instruction decode logic includes a maskable interrupt generator that interrupts the processor during the processing of privileged instructions in user mode. An exception handler processes the privileged instruction interrupt and performs a function similar to the execution of the privileged instruction in privileged instruction mode. The combination of the privileged instruction interrupt and the post-interrupt exception handling enables the operating system developer to test new operating systems by laying them over the current operating system.