lkml.org 
[lkml]   [2005]   [Aug]   [30]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 30 Aug 2005 13:06:00 -0400
FromDave Jones <>
SubjectRe: [PATCH] i386, x86_64 Initial PAT implementation
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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-08-30 19:10    [from the cache]
©2003-2008