Method and apparatus for detecting memory segment violations in a microprocessor-based system
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United States of America Patent
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Jan 21, 1997
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N/A
app pub date -
Feb 8, 1994
filing date -
Feb 8, 1994
priority date (Note) -
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Abstract
A protection mechanism for a microprocessor has multiple privilege levels for tasks running on the microprocessor. A memory control unit for the microprocessor includes segment registers that identify segments of memory assigned to various tasks. When a segment register is loaded with the address of a new segment for a task, the protection mechanism within the memory control unit compares the privilege level of the task requesting the segment with the privilege level of the requested memory segment and determines whether the requested memory segment can be assigned to the requesting task. The relationship between the privilege levels is programmable to provide flexibility in generating privilege faults.
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