Re: [tcf-dev] Supporting different memory access types

[Christophe Augier <christophe.augier@xxxxxxxxxxxxx>]

Hi Khaled,

I think you will need to define several contexts, one for each memory 
types. You can return the type using the types defined by AccessTypes 
[0] but I'm not sure if there is any facility at the moment in Eclipse 
to distinguish the type of the memory contexts.

The basic approach is to have the processor context handle the 
virtual/logical memory accesses and a separate context for physical 
memory accesses.

[0] 
http://git.eclipse.org/c/tcf/org.eclipse.tcf.git/plain/docs/TCF%20Service%20-%20Memory.html

- Christophe

On 09/22/2015 06:58 PM, Khaled Jmal wrote:
> Hi Xavier,
>
> thank you for your prompt reply.
>
> However, I am still a little bit confused. How can the TCF front end
> (e.g. eclipse) be aware of my different memory access types? My TCF
> agent is implemented in a JTAG debugger. Let's say, the target is an ARM
> CortexA9 core. I declare a context "CortexA9" for RunControl and Memory.
> And now I want to display the memory physically and virtually or the
> memory of a specific bus e.g. APB or AHB in the memory view of eclipse
> (or the WR WB).
> How can I do this? Do I have to declare a context for every memory type,
> select the context and then use the memory view?
>
> The agent in this case, can handle all the memory access types. He just
> need to know which access type is requested.
>
> Regards,
> Khaled
>
> On 22.09.2015 17:09, Xavier Pouyollon wrote:
> > On 22/09/2015 16:58, Khaled Jmal wrote:
> > > Hi,
> > >
> > > I am writing a TCF agent which supports different memory access types
> > > e.g. physical, virtual, secure, non secure...
> > > Is something like this supported by TCF? If yes, how should I handle
> > > this? Do I have to add a context for every type of memory?
> > >
> > > Regards,
> > > Khaled
> > >
> > > _______________________________________________
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> > Hi Khaled,
> >
> > > Do I have to add a context for every type of memory?
> > I would say so. Yes.
> >
> > The "easy" way:
> >      In context_read_mem you can implement depending of the type (aka
> > switch type ==> specific code for your type of memory).
> >
> > The better way:
> >      Use the context_dispatcher and the context_set_interface.
> > You define an interface per context type (secure, non secure, ...).
> > This way, you can isolate better the code for the various access types.
> >
> > Hope it helps,
> > Xavier.
> >
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