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FS and GS are clones of ES, the extra segment.
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FS and GS both are just additional segments, no specialty here.
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Names FS and GS come from the fact that they were created after ES: E, F, G.
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They exist only in the 386 and later x86 CPUs.
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Extra segments ES, FS, and GS can be used for both data or code.
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The six segments of the memory system:
