Method and apparatus for detecting memory segment violations in

Details Method and apparatus for detecting memory segment violations in Method and apparatus for detecting memory segment violations in

1994-02-08

1997-01-21

Swann, Tod R.

Boots, shoes, and leggings

395490, 395480, 395186, 39518701, 364DIG1, G06F 1214

Patent

active

055967396

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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