diff options
| author | Michael Neuling <mikey@neuling.org> | 2012-09-10 00:35:26 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-17 16:31:47 +1000 |
| commit | b92a66a65cb4480774066d9a3080c77eb34b7232 (patch) | |
| tree | ba40ef5be8bdb9b76e36ec1da29db90189d2a821 /arch/powerpc/configs | |
| parent | eda485f06d17f98bd58559fb5dd331951ffd1608 (diff) | |
powerpc: Add denormalisation exception handling for POWER6/7
On POWER6 and POWER7 if the input operand to an instruction is a
denormalised single precision binary floating point value we can take
a denormalisation exception where it's expected that the hypervisor
(HV=1) will fix up the inputs before the instruction is run.
This adds code to handle this denormalisation exception for POWER6 and
POWER7.
It also add a CONFIG_PPC_DENORMALISATION option and sets it in
pseries/ppc64_defconfig.
This is useful on bare metal systems only. Based on patch from Milton
Miller.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/configs')
| -rw-r--r-- | arch/powerpc/configs/ppc64_defconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/configs/pseries_defconfig | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig index db27c82e054..e263e6a5aca 100644 --- a/arch/powerpc/configs/ppc64_defconfig +++ b/arch/powerpc/configs/ppc64_defconfig @@ -51,6 +51,7 @@ CONFIG_KEXEC=y CONFIG_IRQ_ALL_CPUS=y CONFIG_MEMORY_HOTREMOVE=y CONFIG_SCHED_SMT=y +CONFIG_PPC_DENORMALISATION=y CONFIG_PCCARD=y CONFIG_ELECTRA_CF=y CONFIG_HOTPLUG_PCI=m diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig index 1f65b3c9b59..c169dfb3e42 100644 --- a/arch/powerpc/configs/pseries_defconfig +++ b/arch/powerpc/configs/pseries_defconfig @@ -48,6 +48,7 @@ CONFIG_MEMORY_HOTREMOVE=y CONFIG_PPC_64K_PAGES=y CONFIG_PPC_SUBPAGE_PROT=y CONFIG_SCHED_SMT=y +CONFIG_PPC_DENORMALISATION=y CONFIG_HOTPLUG_PCI=m CONFIG_HOTPLUG_PCI_RPA=m CONFIG_HOTPLUG_PCI_RPA_DLPAR=m |