Call instruction, return instruction and trap procedure for ring crossing architecture
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United States of America Patent
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Sep 12, 1989
Issued Date -
N/A
app pub date -
Dec 19, 1986
filing date -
Jun 27, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In combination with a multiprocessing and multiprogramming computer system having a ring protection mechanism for protecting computer programs from unauthorized access, a new architecture for the execution of the call instruction, the return instruction, and the trap procedure is implemented partly in firmware and partly in hardware. The architecture includes a new stack mechanism for storing hardware managed control information in a control frame and software controlled data in a data frame.
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