Privilege level checking instruction for implementing a secure hierarchical computer system
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Oct 28, 1985
filing date -
Oct 28, 1985
priority date (Note) -
Expired
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Abstract
A low overhead way for insuring that only routines of sufficient privilege can execute on a secured page of memory in an hierarchial computer system, and for raising the privilege level of a low privilege process in an orderly and secure way is presented. This is done 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.
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