Messages in this thread | | | From | Yuhong Bao <> | Subject | RE: [GIT PULL] scheduler fixes | Date | Fri, 2 Oct 2009 09:40:53 -0700 |
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> [ If I recall correctly=2C cmpxchg8b support detection was something that > was totally messed up in WNT=2C and I have this memory of TMTA _not_ > claiming to support CX8 in the cpuid bits=2C but happily supporting the > instruction itself - because otherwise WNT would blue-screen on boot or > something silly like that. Yep=2C Geoff Chappell describe this bug excellently:http://www.geoffchappel= l.com/viewer.htm?doc=3Dstudies/windows/km/cpu/cx8.htm > As a result=2C the patch below only adds CMPXCHG8B for the obvious Intel > CPU's=2C not for others. There was something really messy about cmpxchg8b > and clone CPU's=2C but I'm not 100% sure about the details=2C so take thi= s > patch with a pinch of salt=2C and some thinking ] Basically=2C pre-SP4 NT 4 would crash if the CX8 bit was set in CPUID and v= endor was not GenuineIntel=2C AuthenticAMD=2C or CyrixInstead due to a bug = in the CPU detection=2C XP had to workaround it too when it began requiring= CX8. Yuhong bao =0A= _________________________________________________________________=0A= Insert movie times and more without leaving Hotmail=AE.=0A= http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=3DTXT_TAGLM_WL_HM_Tut= orial_QuickAdd_062009=
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