Re: [Gems-users] ASI handlers?!!?

[Dan Gibson <degibson@xxxxxxxx>]

Ruby attaches itself to phys_mem0, which is a Simics memory object. 
Memory transactions passed to Ruby from simics have an "ASI" field, (see 
v9_transaction_t in the Simics Reference Manual), though I am not sure 
if *all* accesses (eg ASI!=ASI_P) come to Ruby or not. I would suspect 
that only "memory" accesses come to Ruby (you might want to verify this 
empirically). Some of these non-ASI_P accesses will have may_stall set 
to 0, and Ruby will filter these accesses, so work at low-levels in 
Ruby's code (ie. SimicsDriver.C or lower).
Some other "memory" objects map to other ASIs -- the TLB for instance 
maps to several different ASIs. I have not tried to install ruby to time 
these events, but it might be possible. Any Simics object that allows 
the "timing interface" (see phys_mem0) will work with Ruby. Code to 
install Ruby on a memory object can be found in ruby.c and again in 
interface.C.
Regards,
Dan

mehmetderin.harmanci@xxxxxxx wrote:

> Hello,
>
> I know this sounds more like a Simics issue, but I thought either Ruby
> takes care of the problem or there are some ways to do what I like
> in Ruby.
>
> OK. Here is the problem: I need to define a new ASI and to be able to
> handle accesses to an alternate space and I would like to attribute a
> delay for this alternate space access. Since Ruby is meant to be
> providing timing information to Simics my first question is the following:
> Can Ruby receive requests for an ASI that is not that of the main memory
> (like the ASI_PRIMARY etc.)? If it can not is it possible to make it
> sensitive to that alternate ASI by installing a kind of ASI handler
> (I have seen such handlers on Simics reference manual but I do not know
> how to use them)? Finally, if anybody knows how to deal with ASI handlers,
> especially how to install them, that would be of great help to me.
>
> Sorry to disturb with such a question, but I'm quite desperate about
> the problem.
>
> Best Regards,
>
> Derin Harmanci.
>
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