Instruction for implementing a secure computer system.

摘要

The present invention discloses a low overhead way for insuring that only routines of sufficient privilege can execute on a secured page of memory in an hierarchical computer system, and for raising the privilege level of a low privilege process in an orderly and secure way, through the execution of a single <<gateway>> branch instruction standing between a procedure call by a lower privileged routine, such as a user program, and an operating system itself.