Re: How does bsd deal with architectures that have cache aliasing?
Jason R Thorpe <[email protected]>
| Newsgroups | gmane.os.netbsd.devel.general,gmane.os.netbsd.devel.ports |
|---|---|
| Organization | Wasabi Systems, Inc. |
| Message-ID | <[email protected]> |
On Fri, Feb 28, 2003 at 01:26:27PM -0500, Andrew Brown wrote:
> >If someone wouldn't mind pointing at the relevant pieces of the
> >kernel that deals with cache aliasing for hardware that has
> >this "feature" I would appreciate it. I just wanted to get
> >the gist of how the BSD kernel deals with this issue.
>
> if i understand your question, the answer is probably: look through
> the kernel source for PMAP_PREFER(). that's the machine-dependent
> hook into vm that attempts to align mappings for optimal cache effect.
There's another piece, too. The pmap module is responsible for e.g.
un-cache'ing mappings or revoking mappings when incompatible aliases
*do* occur.
--
-- Jason R. Thorpe <[email protected]>