G - Physics – 06 – F
Patent
G - Physics
06
F
354/243
G06F 9/22 (2006.01) G01R 31/3185 (2006.01) G06F 7/00 (2006.01) G06F 7/57 (2006.01) G06F 9/26 (2006.01) G06F 9/34 (2006.01) G06F 9/35 (2006.01) G06F 9/46 (2006.01) G06F 9/48 (2006.01) G06F 11/07 (2006.01) G06F 12/08 (2006.01) G06F 12/14 (2006.01) G06F 13/00 (2006.01)
Patent
CA 1173172
ABSTRACT OF THE INVENTION A digital data processing system having a processor and a memory system, the memory being organized into objects containing at least operands and instructions. Each object is identified by a unique and permanent identifier code which identifies the data processing system and the object. The system further uses multilevel microcode techniques for controlling sequences of microinstructions and for controlling the interval operations of the processor. The system uses a protection technique to prevent unauthorized access to objects by users who are identified by a subject number which identifies the user, a process of the system for executing a user's procedure, and the type of operation of the system to be performed by the user's procedure. An access control list for each object includes an access control list entry for each subject having access rights to the object and means for confirming that a particular active subject has access rights to a particular object before permitting access to the object. The system also includes stacks for containing information relating to the current state of execution of the system.
403457
Ahlstrom John K.
Bachman Brett L.
Belgard Richard A.
Bernstein David H.
Bratt Richard G.
Data General Corporation
Macrae & Co.
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