Method and apparatus for protecting memory with variable visibility of segment descriptor tables
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United States of America Patent
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May 27, 1997
Grant Date -
N/A
app pub date -
Feb 27, 1995
filing date -
Feb 27, 1995
priority date (Note) -
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Abstract
An additional function is provided to an otherwise conventional operating system for superimposing visibility windows on the GDT and the LDTs for the purpose of memory protection. In a first embodiment, the operating system is also provided with a first additional control logic for selectively invoking the visibility window function to impose visibility windows of different window sizes for different tasks. In a second embodiment, the operating system is provided with a second additional control logic for selectively invoking the visibility window function to impose visibility windows of different window sizes for different operating system functions. In a third embodiment, the operating system is provided with the first as well as the second additional control logic.
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