Re: [Qemu-devel] [PATCH 0/6] ppc: add a IBM 40p machine (RS/6000, PReP)

[David Gibson]

On Wed, Jan 11, 2017 at 05:58:40PM +0100, Artyom Tarasenko wrote:
> Hi Hervé,
> 
> nice work!
> 
> On Thu, Dec 29, 2016 at 11:12 PM, Hervé Poussineau <address@hidden> wrote:
> > Hi,
> >
> > This patchset adds the emulation of the IBM RS/6000 7020 (40p). The real 
> > machine is
> > able to run AIX (up to 4.3.3), Windows NT (up to 4.0 SP1), the beta of OS/2 
> > PowerPC,
> > Solaris, Linux, NetBSD/PReP ...
> >
> > I've tested current emulation with Open Hack'Ware, OpenBIOS and official 
> > firmware.
> >
> > Linux kernel starts, and freezes during boot (like with 'prep' machine).
> 
> If prep can't do it anymore, it looks like a regression. I definitely
> remember seen a sitting penguin and a login prompt ~ 2 years ago. At
> least with OFW.
> 
> > Windows NT starts up to the point where it wants to change endianness.
> 
> I hit that with Solaris/PPC a few years back as you published your
> previous attempt. Do you know what is missing? I guess CPU endianness
> switch emulation is working because it is used in the newer POWER
> CPUs. Is it just the systemIO which has to be improved, or is it more?

It could be the system peripherals.  On the other hand, I think the
endian switch mechanism is a bit different on those older CPUs
compared to the new ones which PAPR uses, so it's possible that's not
properly implemented.

> > Other OSes have not been tested.
> >
> > This machine is a superset of the 'prep' one, because we know exactly what 
> > is/should
> > emulated, and that operating system list running on it is quite wide.
> > I hope that 'prep' machine can be deprecated soon and then later removed.
> 
> Would be nice to keep 'prep' until the 40p can boot Linux and NetBSD
> 6.1.3 (this version used to work with -M prep last time I checked).
> 
> Artyom
> 
> > Patches 1 to 3 are cleanups, and can probably be committed first.
> > Patches 4 to 6 are the real implementation of the IBM 40p.
> >
> > Hervé Poussineau (6):
> >   pci: add pci_vga_type(), giving the device name of the chosen VGA
> >     device
> >   vga: increase priority of 0xa0000 memory region
> >   prep: do not use global variable to access nvram
> >   prep: QOM'ify System I/O
> >   prep: add IBM RS/6000 7020 (40p) memory controller
> >   prep: add IBM RS/6000 7020 (40p) machine emulation
> >
> >  default-configs/ppc-softmmu.mak |   2 +
> >  hw/display/vga.c                |   2 +-
> >  hw/pci/pci.c                    |  22 ++-
> >  hw/ppc/Makefile.objs            |   2 +
> >  hw/ppc/prep.c                   | 235 ++++++++++++++++++++++++++++++-
> >  hw/ppc/prep_systemio.c          | 302 
> > ++++++++++++++++++++++++++++++++++++++++
> >  hw/ppc/rs6000_mc.c              | 232 ++++++++++++++++++++++++++++++
> >  hw/ppc/trace-events             |  11 ++
> >  include/hw/pci/pci.h            |   1 +
> >  9 files changed, 800 insertions(+), 9 deletions(-)
> >  create mode 100644 hw/ppc/prep_systemio.c
> >  create mode 100644 hw/ppc/rs6000_mc.c
> >
> >
> >
> 
> 
> 

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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