Re: [Qemu-devel] [Qemu-ppc] [PATCH] ppc: Improve emulation of THRM registers

[David Gibson]

On Sun, Jun 19, 2016 at 02:14:12PM +0200, BALATON Zoltan wrote:
> On Sun, 19 Jun 2016, Benjamin Herrenschmidt wrote:
> > The 75x and 74xx processors have some thermal monitoring SPRs that
> > some OSes such as MacOS do use. Our current "dumb" implementation
> > isn't good enough and will cause some versions of MacOS to hang during
> > boot.
> > 
> > This lifts an improved emulation from MacOnLinux and adapts it to
> > qemu, thus fixing the problem.
> > 
> > Signed-off-by: Benjamin Herrenschmidt <address@hidden>
> > ---
> > target-ppc/helper.h         |  1 +
> > target-ppc/misc_helper.c    | 41 +++++++++++++++++++++++++++++++++++++++++
> > target-ppc/translate_init.c | 13 ++++++++++---
> > 3 files changed, 52 insertions(+), 3 deletions(-)
> > 
> > diff --git a/target-ppc/helper.h b/target-ppc/helper.h
> > index f4410a8..18eb52f 100644
> > --- a/target-ppc/helper.h
> > +++ b/target-ppc/helper.h
> > @@ -670,3 +670,4 @@ DEF_HELPER_4(dscli, void, env, fprp, fprp, i32)
> > DEF_HELPER_4(dscliq, void, env, fprp, fprp, i32)
> > 
> > DEF_HELPER_1(tbegin, void, env)
> > +DEF_HELPER_1(fixup_thrm, void, env)
> > diff --git a/target-ppc/misc_helper.c b/target-ppc/misc_helper.c
> > index 7d41b01..4315778 100644
> > --- a/target-ppc/misc_helper.c
> > +++ b/target-ppc/misc_helper.c
> > @@ -166,3 +166,44 @@ void ppc_store_msr(CPUPPCState *env, target_ulong 
> > value)
> > {
> >     hreg_store_msr(env, value, 0);
> > }
> > +
> > +/* This code is lifted from MacOnLinux. It is called whenever
> > + * THRM1,2 or 3 is read an fixes up the values in such a way
> > + * that will mac MacOS not hang. These registers exist on some
> 
> Typo: mac -> make?

I've made this change, along with a number of checkpatch fixes as I've
merged this into my tree.


-- 
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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