On Mon, Nov 02, 2015 at 09:55:53AM +1100, Sam Mendoza-Jonas wrote:
> On Tue, Oct 06, 2015 at 05:55:49PM -0500, Scott Wood wrote:
> > Commit a304e2d82a8c3 ("ppc64: purgatory: Reset primary cpu endian to
> > big-endian) changed bctr to rfid. rfid is book3s-only and will cause a
> > fatal exception on book3e.
> >
> > Purgatory is an isolated environment which makes importing information
> > about the subarch awkward, so instead rely on the fact that MSR_LE
> > should never be set on book3e, and the rfid is only needed if MSR_LE is
> > set (and thus needs to be cleared). In theory that MSR bit is reserved
> > on book3e, rather than zero, but in practice I have not seen it set.
> >
> > Signed-off-by: Scott Wood <scottwood at freescale.com>
> > Cc: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
> > ---
> > v2: new patch
>
> Looks good to me, thanks for catching this!
> I'll ping Michael too if you'd like his reviewed-by.
>
> Reviewed-by: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
Following up, also add my
Tested-by: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
>
> >
> > purgatory/arch/ppc64/v2wrap.S | 10 +++++++++-
> > 1 file changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S
> > index 179ade9..3534080 100644
> > --- a/purgatory/arch/ppc64/v2wrap.S
> > +++ b/purgatory/arch/ppc64/v2wrap.S
> > @@ -116,9 +116,17 @@ master:
> > stw 7,0x5c(4) # and patch it into the kernel
> > mr 3,16 # restore dt address
> >
> > + mfmsr 5
> > + andi. 10,5,1 # test MSR_LE
> > + bne little_endian
> > +
> > + li 5,0 # r5 will be 0 for kernel
> > + mtctr 4 # prepare branch to
> > + bctr # start kernel
> > +
> > +little_endian: # book3s-only
> > mtsrr0 4 # prepare branch to
> >
> > - mfmsr 5
> > clrrdi 5,5,1 # clear MSR_LE
> > mtsrr1 5
> >
> > --
> > 2.1.4
>
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