[Skiboot] [PATCH v8 2/3] API to verify the STOP API and image compatibility

[Vaidyanathan Srinivasan]

* Pratik Rajesh Sampat <psampat at linux.ibm.com> [2020-04-23 16:24:37]:

> From: Prem Shanker Jha <premjha2 at in.ibm.com>
> 
> Commit defines a new API primarily intended for OPAL to determine
> cpu register save API's compatibility with HOMER layout and
> self save restore. It can help OPAL determine if version of
> API integrated with OPAL is different from hostboot.
> 
> Change-Id: Ic0de45a336cfb8b6b6096a10ac1cd3ffbaa44fc0
> Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77612
> Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot at us.ibm.com>
> Tested-by: Jenkins Server <pfd-jenkins+hostboot at us.ibm.com>
> Tested-by: Hostboot CI <hostboot-ci+hostboot at us.ibm.com>
> Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr at in.ibm.com>
> Reviewed-by: Gregory S Still <stillgs at us.ibm.com>
> Reviewed-by: Jennifer A Stofer <stofer at us.ibm.com>
> Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/77614
> Tested-by: Jenkins OP Build CI <op-jenkins+hostboot at us.ibm.com>
> Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot at us.ibm.com>
> Reviewed-by: Daniel M Crowell <dcrowell at us.ibm.com>
> Signed-off-by: Pratik Rajesh Sampat <psampat at linux.ibm.com>

Reviewed-by: Vaidyanathan Srinivasan <svaidy at linux.ibm.com>

> ---
>  include/p9_stop_api.H                    | 25 ++++++++++
>  libpore/p9_cpu_reg_restore_instruction.H |  7 ++-
>  libpore/p9_hcd_memmap_base.H             |  7 +++
>  libpore/p9_stop_api.C                    | 58 +++++++++++++++++++++++-
>  libpore/p9_stop_api.H                    | 26 ++++++++++-
>  libpore/p9_stop_util.H                   | 20 ++++----
>  6 files changed, 130 insertions(+), 13 deletions(-)

This stop-api code will help OPAL check and use self-save functions so
that different versions of OPAL can be loaded and run with different
versions of low level firmware stack.

--Vaidy