Method and apparatus for protecting memory with variable visibil

Details Method and apparatus for protecting memory with variable visibil Method and apparatus for protecting memory with variable visibil

1995-02-27

1997-05-27

Moore, David K.

395478, 395479, 395474, 395490, G06F 1200, G06F 1202, G06F 926, G06F 934

Patent

active

056340362

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.

REFERENCES:
patent: 4442484 (1984-04-01), Childs, Jr. et al.
patent: 4890223 (1989-12-01), Cruess et al.

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