System protection apparatus
Abstract
Abstract APPARATUS IN A COMPUTER SYSTEM FOR PROTECTING OPERATING PROGRAMS AND RELATED DATA STORED IN THE COMPUTER MEMORY AND FOR PREVENTING UNAUTHORIZED ACTIONS IN THE SYSTEM WHILE AN UNDEBUGGED PROGRAM IS BEING EXECUTED BY THE SYSTEM. A STATUS REGISTER IS PROVIDED IN THE SYSTEM ARITHMETIC UNIT FOR STORING A SYSTEM PROTECTION STATUS WORD. ANOTHER REGISTER IS PROVIDED TO IDENTIFY THE GROUP OR VOLUME OF MEMORY STORAGE LOCATIONS WHOSE PROTECTION STATUS IS DEFINED BY THE STATUS WORD IN THE STATUS REGISTER. EACH TIME MEMORY IS ADDRESSED, THE STATUS WORD APPLICABLE TO THE ADDRESSED MEMORY STORAGE LOCATION IS CHECKED. THE STATUS WORD DEFINES ONE OF A PLURALITY OF PROTECTION STATES FOR THE ADDRESSED MEMORY STORAGE LOCA- TION. LOGIC GATES ARE PROVIDED WHICH ARE RESPONSIVE TO THE PROTECTION STATUS WORD, TO THE TYPE OF OPERATION FOR WHICH MEMORY IS BEING ADDRESSED, AND TO OTHER CONDITIONS TO DETERMINE IF A SYSTEM PROTECTION VIOLATION HAS OCCURED. UPON DETECTION OF A SYSTEM PROTECTION VIOLATION, ACCESS TO THE ADDRESSED MEMORY LOCATION IS INHIBITED AND EXECUTION OF AN ERROR ROUTINE IS INITIATED.
Inventors
- 👤 Sherril A Harmon
- 👤 Wallace N Patterson
- 👤 Emery A White
Bibliographic Details
Claims Analysis
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