[PATCH] powerpc: Disable external interrupts in bootwrapper

[Mark A. Greer]

On Wed, Mar 28, 2007 at 09:43:07AM +1000, Paul Mackerras wrote:
> Mark A. Greer writes:
> 
> > Disable external interrupts very early in the bootwrapper in case
> > the firmware left a device generating interrupts.
> 
> Sounds reasonable, except that I wonder if systems running under a
> real OF want to do this...

I don't know.  Would someone who knows OF speak up?

> > +	li	r9,(1<<15)@l	/* Disable external intrs (clear MSR[EE]) */
> 
> That will actually get us ffff8000 in r9.

Oops.

> > +	mfmsr	r10
> > +	andc	r10,r10,r9
> 
> I suggest this sequence instead:
> 
> 	mfmsr	r10
> 	rlwinm	r10,r10,0,~(1<<15)	/* clear MSR_EE */

That works.  Respin in a bit.

Thanks,

Mark