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SubjectRe: Assignment of GDT entries
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On Wed, 2006-09-13 at 11:58 -0700, Jeremy Fitzhardinge wrote:
> What's the rationale for the current assignment of GDT entries? In
> particular, this section:
>
> * 0 - null
> * 1 - reserved
> * 2 - reserved
> * 3 - reserved
> *
> * 4 - unused <==== new cacheline
> * 5 - unused
> *
> * ------- start of TLS (Thread-Local Storage) segments:
> *
> * 6 - TLS segment #1 [ glibc's TLS segment ]
> * 7 - TLS segment #2 [ Wine's %fs Win32 segment ]
> * 8 - TLS segment #3
> * 9 - reserved
> * 10 - reserved
> * 11 - reserved
>
>
> What are entries 1-3 and 9-11 reserved for? Must they be unused for
> some reason, or is there some proposed use that has not been impemented yet?


I don't know the exact details on these; I do know that several GDT
entries tend to be used by BIOSes in their APM implementations and thus
are better of not being used. That might be the underlying reason
here....


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