Subject: Re: R4000 cache lines
To: Jonathan Stone <jonathan@dsg.stanford.edu>
From: Jason Thorpe <thorpej@nas.nasa.gov>
List: port-mips
Date: 06/03/1998 08:17:13
On Wed, 03 Jun 1998 02:35:03 -0700
Jonathan Stone <jonathan@DSG.Stanford.EDU> wrote:
> >Are the R4000 virtually indexed cache entries tagges with ASIDs?
>
> For kseg0/kuseg, right? They better not be, or all sorts of things,
> like kernel malloc, would also break.
>
> (Userspace addresses have to be and k1seg shouldn't be in the cache.)
Ok, then *crosses fingers* the changes I committed should DTRT, except
for userspace addresses... don't know how to deal with those, per se,
because the process that requested the I/O may not be the current process,
and so a TLB miss would spell disaster.
Jason R. Thorpe thorpej@nas.nasa.gov
NASA Ames Research Center Home: +1 408 866 1912
NAS: M/S 258-5 Work: +1 650 604 0935
Moffett Field, CA 94035 Pager: +1 650 428 6939