[coreboot] Patch merged into coreboot/master: ef6dfc1 Fix register corruption during Intel Microcode update

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit ef6dfc1d0656f34331519fb97e5ec87784c4686d
Author: Stefan Reinauer <reinauer at chromium.org>
Date:   Wed May 2 16:41:55 2012 -0700

    Fix register corruption during Intel Microcode update
    
    Another bug in the Intel microcode update code that existed since we switched
    to LinuxBIOSv2 in 2004:
    
    The inline assembly code that reads the CPU revision from an MSR after running
    cpuid(1) trashes registers EBX and ECX. Only ECX was mentioned in the clobber
    list. C code running after this function could silently access completely wrong
    data, which resulted in the wrong date being printed on microcode updates (and
    potentially other issues happening until the C code writes to EBX again)
    
    Change-Id: Ida733fa1747565ec9824d3a37d08b1a73cd8355f
    Signed-off-by: Stefan Reinauer <reinauer at google.com>

Reviewed-By: Patrick Georgi <patrick at georgi-clan.de> at Thu May  3 10:47:36 2012, giving +2
Build-Tested: build bot (Jenkins) at Thu May  3 03:37:28 2012, giving +1
See http://review.coreboot.org/996 for details.

-gerrit