Re: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-09-02 Thread Segher Boessenkool
On Mon, Sep 02, 2019 at 11:48:59AM +1000, Michael Ellerman wrote: > "Alastair D'Silva" writes: > > On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: > >> Can we be 100% sure that GCC won't add any code accessing some > >> global data or stack while the Data MMU is OFF ? > > > > +mpe > > >

RE: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-09-01 Thread Michael Ellerman
"Alastair D'Silva" writes: > On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: >> >> Le 20/08/2019 à 06:36, Alastair D'Silva a écrit : >> > On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote: >> >> [...] >> >> > >> > Thanks Christophe, >> > >> > I'm trying a somewhat different

RE: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-08-21 Thread Alastair D'Silva
On Thu, 2019-08-22 at 07:06 +0200, Christophe Leroy wrote: > > Le 22/08/2019 à 02:27, Alastair D'Silva a écrit : > > On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: > > > Le 20/08/2019 à 06:36, Alastair D'Silva a écrit : > > > > On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote:

Re: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-08-21 Thread Christophe Leroy
Le 22/08/2019 à 02:27, Alastair D'Silva a écrit : On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: Le 20/08/2019 à 06:36, Alastair D'Silva a écrit : On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote: [...] Thanks Christophe, I'm trying a somewhat different approach t

RE: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-08-21 Thread Alastair D'Silva
On Wed, 2019-08-21 at 22:27 +0200, Christophe Leroy wrote: > > Le 20/08/2019 à 06:36, Alastair D'Silva a écrit : > > On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote: > > [...] > > > > > Thanks Christophe, > > > > I'm trying a somewhat different approach that requires less > > knowled

Re: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-08-21 Thread Christophe Leroy
Le 20/08/2019 à 06:36, Alastair D'Silva a écrit : On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote: [...] Thanks Christophe, I'm trying a somewhat different approach that requires less knowledge of assembler. Handling of CPU_FTR_COHERENT_ICACHE is outside this function. The cod

Re: [RFC PATCH] powerpc: Convert ____flush_dcache_icache_phys() to C

2019-08-19 Thread Alastair D'Silva
On Fri, 2019-08-16 at 15:52 +, Christophe Leroy wrote: > Resulting code (8xx with 16 bytes per cacheline and 16k pages) > > 016c <__flush_dcache_icache_phys>: > 16c: 54 63 00 22 rlwinm r3,r3,0,0,17 > 170: 7d 20 00 a6 mfmsr r9 > 174: 39 40 04 00 li r10,1024 > 178: 55