Re: Page Attribute Table (PAT) support?

From: Timur Tabi (ttabi@interactivesi.com)
Date: Wed Jan 24 2001 - 15:30:10 EST

** Reply to message from Jeff Hartmann <jhartmann@valinux.com> on Wed, 24 Jan
2001 11:45:43 -0700

> I'm actually writing support for the PAT as we speak. I already have
> working code for PAT setup. Just having a parameter for ioremap is not
> enough, unfortunately. According to the Intel Architecture Software
> Developer's Manual we have to remove all mappings of the page that are
> cached.

For our specific purposes, that's not important. We already flush the cache
before we create uncached regions (via ioremap_nocache). I understand that as a
general Linux feature, you can't ignore cache incoherency, but I don't think
it's a hard requirement. 

-- 
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com

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This archive was generated by hypermail 2b29 : Wed Jan 31 2001 - 21:00:19 EST