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authorMichael Neuling <mikey@neuling.org>2012-09-10 00:35:26 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-09-17 16:31:47 +1000
commitb92a66a65cb4480774066d9a3080c77eb34b7232 (patch)
treeba40ef5be8bdb9b76e36ec1da29db90189d2a821 /arch/powerpc/Kconfig
parenteda485f06d17f98bd58559fb5dd331951ffd1608 (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/Kconfig')
-rw-r--r--arch/powerpc/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 98e513b6270..748ccaa3b4b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -560,6 +560,14 @@ config SCHED_SMT
when dealing with POWER5 cpus at a cost of slightly increased
overhead in some places. If unsure say N here.
+config PPC_DENORMALISATION
+ bool "PowerPC denormalisation exception handling"
+ depends on PPC_BOOK3S_64
+ default "n"
+ ---help---
+ Add support for handling denormalisation of single precision
+ values. Useful for bare metal only. If unsure say Y here.
+
config CMDLINE_BOOL
bool "Default bootloader kernel arguments"