From: Michael Neuling <mikey@neuling.org>
Date: Mon, 10 Sep 2012 00:35:26 +0000 (+0000)
Subject: powerpc: Add denormalisation exception handling for POWER6/7
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~10^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b92a66a65cb4480774066d9a3080c77eb34b7232;p=pandora-kernel.git

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>
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