Patents by Inventor Curtis Cornils

Curtis Cornils has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Isolated multiprocessing system having tracking circuit for verifyng only that the processor is executing set of entry instructions upon initiation of the system controller program
    Patent number: 5551051
    Abstract: A computer (20) includes a hardware memory access enforcer (50) to insure that various independent programs (52, 54) operating on the computer (20) follow isolated processing rules. Each program has its own memory domain (56), which may extend across instruction, data, and I/O memory spaces (40, 42, 44). A system controller program (52) is a trusted process. The system controller (52) may access memory in the domain (56) of any application (54), and program flow may exit system controller (52) to any application (54). However, applications (54) cannot access memory outside of their own domains (56), and program flow may not exit applications (54) to enter other applications (54). Program flow may exit applications (54) to system controller (52) only if directed to an entry address (60). A tracking circuit (74) verifies that a microprocessor (22) actually executes entry instructions (94) located at the entry address (60).
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: August 27, 1996
    Assignee: Motorola, Inc.
    Inventors: Lee Silverthorn, Curtis Cornils, Mark L. Kirchner, Susan D. Stephens, Parker E. Crouse