On Sat, Jan 11, 2014 at 01:05:21PM +0000, Leif Lindholm wrote: > A new macro for setting/clearing bits in the SCTLR. > > Signed-off-by: Leif Lindholm <[email protected]> > Suggested-by: Will Deacon <[email protected]> > --- > arch/arm/include/asm/assembler.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/arch/arm/include/asm/assembler.h > b/arch/arm/include/asm/assembler.h > index 5c22851..aba6458 100644 > --- a/arch/arm/include/asm/assembler.h > +++ b/arch/arm/include/asm/assembler.h > @@ -383,4 +383,17 @@ THUMB( orr \reg , \reg , #PSR_T_BIT ) > #endif > .endm > > +#ifdef CONFIG_CPU_CP15 > +/* Macro for setting/clearing bits in sctlr */ > + .macro update_sctlr, set:req, clear:req, tmp:req, tmp2:req > + mrc p15, 0, \tmp, c1, c0, 0 > + ldr \tmp2, =\set > + orr \tmp, \tmp, \tmp2 > + ldr \tmp2, =\clear > + mvn \tmp2, \tmp2 > + and \tmp, \tmp, \tmp2 > + mcr p15, 0, \tmp, c1, c0, 0
I think this would be cleaner if you force the caller to put set and clear into registers beforehand, rather than have to do the literal load every time. Also, I don't think set and clear should be required (and then you can lose tmp2 as well). Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
