Method and apparatus for improving segmented memory addressing

Details Method and apparatus for improving segmented memory addressing Method and apparatus for improving segmented memory addressing

2005-02-01

2005-02-01

Padmanabhan, Mano (Department: 2188)

Electrical computers and digital processing systems: memory

Address formation

Combining two or more values to create address

C711S206000, C711S208000, C711S209000, C711S220000

Reexamination Certificate

active

06851040

ABSTRACT:
A method and apparatus for breaking complex X86 segment operations and segmented memory addressing into explicit sub-operations so that they may be exposed to compiler or translator-based optimizations. A method includes providing a first segment selector for deriving a linear address of a segment descriptor in a first descriptor table and providing a second segment selector for deriving a linear address of a segment descriptor in a second descriptor table. The method also includes attempting an access of the first descriptor table to derive a segment descriptor, and if the access of the first descriptor table fails, attempting an access of the second descriptor table to derive a segment descriptor. The method also includes storing a derived segment descriptor from a successful attempted access in a descriptor register.

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