On Thu, Apr 2, 2020 at 2:42 PM Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote: > > "Alastair D'Silva" <alastair@xxxxxxxxxxx> writes: > >> -----Original Message----- > >> From: Dan Williams <dan.j.williams@xxxxxxxxx> > >> > >> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@xxxxxxxxxxx> > >> 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. There's an OPAL call API reference here: http://open-power.github.io/skiboot/doc/opal-api/index.html Oliver
