Re: Device driver api

[Sam Price]

Thanks for all the insight.  

My use case is for embedded programs interfacing with custom fpga registers, and getting code coverage for these.
My device wouldn't have value for the community.

I'll play around with dlopen, and prototype some stuff on a fork.

Sam

On Thu, Mar 24, 2022 at 4:51 PM Alex Bennée <alex.bennee@linaro.org> wrote:

Sam Price <thesamprice@gmail.com> writes:

> Is there a shared library interface in the works for writing firmware
> device models without recompiling all of qemu?

No - but incremental builds should be fairly cheap especially if you
only build the target you care about, possibly with a reduced config.

> I was reading through
> https://sebastienbourdelin.com/2021/06/16/writing-a-custom-device-for-qemu/

That's a nice write-up.

> but was wondering if there was a shared library approach where I could build my device driver with some basic functions for getting
> memory ranges this library supports / etc and then
>
> https://elinux.org/images/9/95/Jw-ei-elc2010-final.pdf
> 10 years ago there was a presentation mentioning using dlopen to do
> thisd o this type of thing.

The upstream community isn't really motivated to maintain an API for
external device models because ultimately we believe they are best
placed in the QEMU code, if not upstream in a fork. There are some forks
of QEMU which support things like SystemC models but so far none of that
has been submitted for upstream.

--
Alex Bennée

--

Thank you,

Sam Price
(707) 742-3726