16-bit code and L4

[Valery V. Sedletski]

>
>I was working on allowing applications to use segmentation in
>Pistachio as well.  The modifications enabled apps to install segment
>descriptors in a per address space LDT (after sanity checking by the
>kernel of course).  Modifying the GDT is not supported.
>

Is GDT modifying support planned in the future?

>
>By setting a thread in a special mode the kernel will never modify the
>ES, FS, and GS of the thread.  For optimization reasons the kernel
>still retains the right to modify DS and SS though, so in effect these
>can not be freely used by the app.  Also, the kernel only allows data
>segments to be installed --- no code or other segment types.
>
>It's been a while since I worked on this and got sidetracked by other
>stuff, so I didn't completely finish the implementation yet.
>
>	eSk
>

Is this documented somewhere? 
(It seems that it is not documented in L4 version X.2 API manual.)
Maybe, it is in some source code documentation (Doxygen generated or
alike)?

>
>
>

Thank you very much for your answer.

WBR,
Valery