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powerpc: Add denormalisation exception handling for POWER6/7

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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>
This commit is contained in:
Michael Neuling
2012-09-10 00:35:26 +00:00
committed by Benjamin Herrenschmidt
parent eda485f06d
commit b92a66a65c
6 changed files with 137 additions and 0 deletions
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1
arch/powerpc/configs/ppc64_defconfig
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@@ -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