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Processor with a function to prevent illegal execution of a program, an instruction executed by a processor and a method of preventing illegal execution of a program

  • US 6,704,872 B1
  • Filed: 04/28/1999
  • Issued: 03/09/2004
  • Est. Priority Date: 05/19/1998
  • Status: Active Grant
First Claim
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1. A processor device comprising an integrated circuit chip residing in a computer system having a function to prevent illegal execution of a program and of a type which has a memory managing unit internal to the processor device having a function to manage a main memory installed in said computer system and has an instruction set for operating itself, whereinsaid instruction set includes an instruction for permitting execution of a program code on said main memory, and said execution permitting instruction includes a predetermined authentication operation in addition to an operation to provide said memory managing unit with an identification number of a program to be executed and address/attribute information, wherein said authentication operation is implemented in a microprogram executed within said processor device to authenticate said program without exposure of authentication result exterior to said chip to thereby protect against system level probing and monitoring.

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