In message <5e6fbb75-be97-4d97-aea2-ec8eaf1e0...@kernel.crashing.org> you wrote : > > On Jul 11, 2011, at 12:52 AM, Michael Neuling wrote: > > > On POWER6 and POWER7 if the input operand to an instruction is a > > denormalised single precision binary floating we can take a > > denormalisation exception where it's expected that the hypervisor = > (HV=3D1) > > will fix up the inputs before the instruction is run. > >=20 > > This adds code to handle this denormalisation exception for POWER6 and > > POWER7. > >=20 > > It also add a CONFIG_PPC_DENORMALISATION option and sets it in > > pseries/ppc64_defconfig.=20 > >=20 > > This is useful on bare metal systems only. Based on patch from Milton > > Miller. > >=20 > > Signed-off-by: Michael Neuling <mi...@neuling.org> > >=20 > > --- > > arch/powerpc/Kconfig | 7 + > > arch/powerpc/configs/ppc64_defconfig | 1=20 > > arch/powerpc/configs/pseries_defconfig | 1=20 > > arch/powerpc/include/asm/ppc-opcode.h | 2=20 > > arch/powerpc/include/asm/reg.h | 1=20 > > arch/powerpc/kernel/exceptions-64s.S | 125 = > +++++++++++++++++++++++++++++++++ > > 6 files changed, 137 insertions(+) > >=20 > > Index: linux-ozlabs/arch/powerpc/Kconfig > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > --- linux-ozlabs.orig/arch/powerpc/Kconfig > > +++ linux-ozlabs/arch/powerpc/Kconfig > > @@ -556,6 +556,13 @@ config SCHED_SMT > > when dealing with POWER5 cpus at a cost of slightly increased > > overhead in some places. If unsure say N here. > >=20 > > +config PPC_DENORMALISATION > > + bool "PowerPC denormalisation exception handling" > > Should this at least depend on PPC_BOOK3S_64 ?
Yep, thanks! Mikey _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
