Re: port-amd64/38480: x86 MTRR code makes invalid assumption of 8 variable MTRRs

[Thor Lancelot Simon <tls%rek.tjls.com@localhost>]

The following reply was made to PR port-amd64/38480; it has been noted by GNATS.

From: Thor Lancelot Simon <tls%rek.tjls.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: port-amd64/38480: x86 MTRR code makes invalid assumption of 8 
variable MTRRs
Date: Tue, 22 Apr 2008 16:03:07 -0400

 On Tue, Apr 22, 2008 at 07:50:02PM +0000, Andrew Doran wrote:
 >  
 >  >   will be present.  Rather, the OS is supposed to read the MTRR
 >  >   config register and mask the returned value with 0xff to obtain
 >  >   the number of variable-size MTRRs available for use.
 >  
 >  Do you have a reference for that?
 
 At this point, allow me to lamely indicate that it's what the Linux code,
 which works on this platform, does... but I did find a reference to it
 in an Intel document yesterday -- I'll try to find it again.