From: Matt Fleming <matt.fleming@intel.com>
Date: Mon, 24 Feb 2014 13:37:29 +0000 (+0000)
Subject: x86/boot: Don't overwrite cr4 when enabling PAE
X-Git-Tag: v3.15-rc1~173^2~5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=108d3f44b16be2ecf0e44c2f2863752918eb7bce;p=pandora-kernel.git

x86/boot: Don't overwrite cr4 when enabling PAE

Some EFI firmware makes use of the FPU during boottime services and
clearing X86_CR4_OSFXSR by overwriting %cr4 causes the firmware to
crash.

Add the PAE bit explicitly instead of trashing the existing contents,
leaving the rest of the bits as the firmware set them.

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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