Messages in this thread |  | | Date | Wed, 15 Nov 2000 17:02:03 -0800 | From | "H. Peter Anvin" <> | Subject | Re: New bluesmoke patch available, implements MCE-without-MCA support |
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Mikael Pettersson wrote: > > On 15 Nov 2000, H. Peter Anvin wrote: > > >This implements support for MCE on chips which don't support MCA (in > >addition to enabling MCA for non-Intel chips, like Athlon, which > >supports MCA.) > > > >I would appreciate it if people who have chips with MCE but no MCA -- > >this includes older AMD chips and some Cyrix chips at the very least > >-- would please be so kind and try this out. > > I have a K6-III which announces MCE but not MCA, so I was going to > test this on that machine. > > However, both the K6-III manual and the K6 BIOS guide state quite > clearly that the K6 family only has a "stub" MCE implementation. > The MCE capability is announced, there are two MCE-related MSRs, > and there is a CR4.MCE flag, but none of it actually _does_ anything. > > The new CPU detection code should probably clear FEATURE_MCE for K6 CPUs. > (We might consider it an AMD bug, but in their defense, they do state > that the stub implementation was done for "compatibility" reasons.) >
Actually, that's just fine. It won't cause any harm; all that will mean is that it will never raise #MC. Remember that a CPU should, in proper operation, never raise #MC anyway!
Their implementation is a legal (albeit useless) implementation of MCE. No need to special-case it.
-hpa
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