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Date:   Thu, 2 Apr 2020 13:10:12 +0200
From:   Greg Kurz <groug@kaod.org>
To:     Michael Ellerman <mpe@ellerman.id.au>
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        Alastair D'Silva <alastair@d-silva.org>,
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Subject: Re: [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory
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On Thu, 02 Apr 2020 21:06:01 +1100
Michael Ellerman <mpe@ellerman.id.au> wrote:

> "Oliver O'Halloran" <oohall@gmail.com> writes:
> > On Thu, Apr 2, 2020 at 2:42 PM Michael Ellerman <mpe@ellerman.id.au> wrote:
> >> "Alastair D'Silva" <alastair@d-silva.org> writes:
> >> >> -----Original Message-----
> >> >> From: Dan Williams <dan.j.williams@intel.com>
> >> >>
> >> >> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@d-silva.org>
> >> >> wrote:
> >> >> >
> >> >> > *snip*
> >> >> Are OPAL calls similar to ACPI DSMs? I.e. methods for the OS to invoke
> >> >> platform firmware services? What's Skiboot?
> >> >
> >> > Yes, OPAL is the interface to firmware for POWER. Skiboot is the open-source (and only) implementation of OPAL.
> >>
> >>   https://github.com/open-power/skiboot
> >>
> >> In particular the tokens for calls are defined here:
> >>
> >>   https://github.com/open-power/skiboot/blob/master/include/opal-api.h#L220
> >>
> >> And you can grep for the token to find the implementation:
> >>
> >>   https://github.com/open-power/skiboot/blob/master/hw/npu2-opencapi.c#L2328
> >
> > I'm not sure I'd encourage anyone to read npu2-opencapi.c. I find it
> > hard enough to follow even with access to the workbooks.
> 
> Compared to certain firmwares that run on certain other platforms it's
> actually pretty readable code ;)
> 

Forth rocks ! ;-)

> > There's an OPAL call API reference here:
> > http://open-power.github.io/skiboot/doc/opal-api/index.html
> 
> Even better.
> 
> cheers