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2 pj 1 
- Fix problems with ASs and INTs (see kl/cxsw-1.s and xlib/exc.s)
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	Done! At least it doesn't crash :)
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	Must check in some way if the stack is correct or not...
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- verify that only the needed .o files are linked (see -DPROFILE); provide
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	a lightweight implementation of ``message'' (currently remapped on
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	cprintf) that does not require linking libm
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- profile and optimize the event management code
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- rewrite cons.c isolating the parts making assumptions on memory spaces and
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	improving efficency (window-based functions can be implemented
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	separately)
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- pentium timestamp conter code... Integrate it in timer code and event
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	management
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					Assigned to Gerardo
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- provide some macro for int-based and call gate-based system calls
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- begin to implement some serious code using OSLib:
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	1) some simple multithreading executive based on cooperative and
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		preemptive scheduling, message-based or based on shared
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		memory and semaphores...
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	2) some real small kernel, separating it from application code
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	3) as 2), but with different address spaces for kernel and
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		application
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	...
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- fix the eXtender in order to be fully multiboot compliant (no extension to
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	the standard multiboot structure: we can use memory maps). Upgrade it
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	to the latest version of the standard. Implement modules loading
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  == Some work has been done... Now the eXtender can load MB compiant images
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     and manages modules.
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     o Still to do: the memory map stuff & module parameters