Access to hardware registers

[jack at ...358...]

Hey Stefan,

thank you for your reply.
I already managed to get it working and did what you mentioned except that I used the following class:
/repos/os/include/os/attached_mmio.h

But thank you once again for the good explanation, it is much clearer now.

Best regards,
Jack

On 16 November 2015 09:01:21 +01:00, Stefan Kalkowski <stefan.kalkowski at ...52...1...> wrote:

> Hi Jack,
> 
> On 11/09/2015 12:30 PM, <jack at ...358...> wrote:
> 
> > Hello Genodians,
> > 
> > I have a program which needs access to some hardware registers.
> > The Region Manager (RM) is complaining, because he cannot find the address.
> > 
> > no RM attachment (faulter fb710c with IP 36b614 attempts to write to address
> > 43c00004)
> > 
> > How can I add this region?
> > In the runscript as a config setting for RM?
> > Add these addresses to the platform_support.cc?
> > Or do I need a driver to gain access to these registers?
> > 
> Please, do not mix up the virtual memory of a program administrated by
> its RM session with a physical address. A portion of memory mapped I/O
> (hardware registers), in form of an IOMEM dataspace within Genode, is a
> resource and has to be requested with a session call like other
> resources too. So your driver code first needs to open an IOMEM session
> (given the physical address of the hardware registers as argument),
> request the dataspace, and attach that dataspace to its RM session. The
> concepts behind this are explained in more detail in the "Genode
> Foundations" chapter 3.4 [].
> 
> A software tool which incorporates all of these steps is the
> Attached_io_mem_dataspace in file
> repos/os/include/os/attached_io_mem_dataspace.h.
> 
> So incorporating:
> 
> Attached_io_mem_dataspace iomem(HARDWARE_REG_ADDR, HARDWARE_REG_SIZE);
> 
> should be sufficient. Calling the 'local_addr' member of the object
> delivers the address where you can access the hardware registers within
> your component.
> 
> Regards
> Stefan
> 
> 
> > 
> > Best regards,
> > Jack
> >
> >
> >
> > ------------------------------------------------------------------------------
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> > 
> > 
> > 
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> > 
> -- 
> Stefan Kalkowski
> Genode Labs
> 
> <http://www.genode-labs.com/> · <http://genode.org/>
>
> ------------------------------------------------------------------------------
> Presto, an open source distributed SQL query engine for big data, initially
> developed by Facebook, enables you to easily query your data on Hadoop in a
> more interactive manner. Teradata is also now providing full enterprise
> support for Presto. Download a free open source copy now.
> <http://pubads.g.doubleclick.net/gampad/clk?id=250295911&iu=/4140>
> _______________________________________________
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