Patents by Inventor Gary F. Campbell

Gary F. Campbell 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).

  • Storage access validation to data messages using partial storage address data indexed entries containing permissible address range validation for message source
    Patent number: 5964835
    Abstract: A multiprocessor system includes a number of central processing unit (CPUs) and at least one input/output (I/O) device interconnected by routing apparatus for communicating packetized messages therebetween. The messages contain address information identifying the source and destination of the message, and may also contain requests to write to, or read from, storage of a CPU. Protection against errant reads or writes is provided by an access validation method that utilizes access validation information contained in plural entries maintained by each CPU. Each entry provides validation by identifying what elements of the system has read and/or write wccss to the memory of that CPU, without which memory access is denied.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 12, 1999
    Assignee: Tandem Computers Incorporated
    Inventors: Daniel L. Fowler, William Edward Baker, William Patterson Bunton, Gary F. Campbell, Richard W. Cutts, Jr., David J. Garcia, Paul N. Hintikka, Robert W. Horst, Geoffrey I. Iswandhi, David P. Sonnier, William Joel Watson, Frank A. Williams
  • Interprocessor messaging system
    Patent number: 5915088
    Abstract: A multiprocessor system is configured so that each of the central processing units (CPUs) of the system have accessed at least portions of the memory of each other CPU. Interprocessor messaging is conducted by a CPU writing to, or reading from, the memory of another CPU of the system.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: June 22, 1999
    Assignee: Tandem Computers Incorporated
    Inventors: Murali Basavaiah, Joseph D. Kinkade, Gary F. Campbell, Srinivasa Murthy
  • Fail-fast, fail-functional, fault-tolerant multiprocessor system
    Patent number: 5751932
    Abstract: A multiprocessor system includes a number of sub-processor systems, each substantially identically constructed, and each comprising a central processing unit (CPU), and at least one I/O device, interconnected by routing apparatus that also interconnects the sub-processor systems. A CPU of any one of the sub-processor systems may communicate, through the routing elements, with any I/O device of the system, or with any CPU of the system. The CPUs are structured to operate in one of two modes: a simplex mode in which the two CPUs operate independently of each other, and a duplex mode in which the CPUs operate in lock-step synchronism to execute each instruction of identical instruction streams at substantially the same time. Communications between I/O devices and CPUs is by packetized messages. Interrupts from I/O devices are communicated from the I/O devices to the CPUs (or from one CPU to another CPU) as message packets. CPUs and I/O devices may write to, or read from, memory of a CPU of the system.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 12, 1998
    Assignee: Tandem Computers Incorporated
    Inventors: Robert W. Horst, William Edward Baker, Randall G. Banton, John Michael Brown, William F. Bruckert, William Patterson Bunton, Gary F. Campbell, John Deane Coddington, Richard W. Cutts, Jr., Barry Lee Drexler, Harry Frank Elrod, Daniel L. Fowler, David J. Garcia, Paul N. Hintikka, Geoffrey I. Iswandhi, Douglas Eugene Jewett, Curtis Willard Jones, Jr., James Stevens Klecka, John C. Krause, Stephen G. Low, Susan Stone Meredith, Steven C. Meyers, David P. Sonnier, William Joel Watson, Patricia L. Whiteside, Frank A. Williams, Linda Ellen Zalzala