Re: [Gems-users] interaction with cache controller

[Dan Gibson <degibson@xxxxxxxx>]

Ruby implicitly assumes that all stallable (IE may_stall is 1) accesses 
passed to it are valid memory operations, regardless of address.
Dave Z. wrote:
> By starting from ruby_operate in ruby.c and following
> the function calls, I can see how memory operations
> are handled. But I couldn't see where Ruby checks the
> validity of an address received from Simics. I'm
> wondering if I missed that part or if Ruby doesn't
> check to see if the address is in the cache
> boundaries. 
>
> Thanks.
>
> DZ.
>
> --- Greg Byrd <gbyrd@xxxxxxxx> wrote:
>
>   
> > Ruby is attached to the Simics memory as a timing
> > model.  Simics calls 
> > the operate function of the timing model, which is
> > ruby_operate (in 
> > ruby.c).  That eventually calls
> > SimicsDriver::makeRequest.  Start there.
> >
> > ...gb
> >
> >
> >
> > Dave Z. wrote:
> >     
> > > Thanks for your reply. Let me revise my questions.
> > >
> > > As I understand, Simics makes a call to
> > >       
> > makeRequest in
> >     
> > > Sequencer.C when there is a cache request such as
> > > load, store, atomic, etc. When/where does Simics
> > >       
> > make
> >     
> > > such a call? In SimicsDriver.C or
> > >       
> > SimicsProcessor.C?
> >     
> > > Please correct me if I'm wrong.
> > >
> > > Also, does Ruby check the validity of an address
> > >       
> > it
> >     
> > > receives from Simics? In other words, does it
> > >       
> > check to
> >     
> > > see if the address is in the cache boundaries? If
> > >       
> > so,
> >     
> > > could you please tell me where?
> > >
> > >   
> > >       
> > _______________________________________________
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> >
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> >
> >
> >     
>
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