Messages in this thread | | | Date | Tue, 30 Aug 2005 13:06:00 -0400 | From | Dave Jones <> | Subject | Re: [PATCH] i386, x86_64 Initial PAT implementation |
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On Tue, Aug 30, 2005 at 03:45:36PM +0100, Alan Cox wrote: > On Llu, 2005-08-29 at 18:20 -0600, Eric W. Biederman wrote: > > ways. Currently this code only allows for an additional flavor > > of uncached access to physical memory addresses which should be hard > > to abuse, and should raise no additional aliasing problems. No > > attempt has been made to fix theoretical aliasing problems. > > Even an uncached/cached alias causes random memory corruption or an MCE > on x86 systems. In fact it can occur even for an alias not in theory > touched by the CPU if it happens to prefetch into or speculate the > address. > > Also be sure to read the PII Xeon errata - early PAT has a bug or two.
There are various PAT errata all the way through to Pentium-M iirc.
Dave
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