Bill> I'm very confused at this point. Can you briefly explain how
Bill> this works, or point me to a description? I don't see how
Bill> you could do user level I/O without registering the memory
Bill> with the hardware. I'm especially confused by the comment
Bill> (may not have been yours) that the memory doesn't have to be
Bill> pinned. -- Bill Jordan InfiniCon Systems
You add a hook to the kernel so it tells you if a page is about to be
paged out or otherwise move. Then you set a bit in the adapter's page
table so that it won't try to access that page without telling you.
If the adapter asks for the page, you get the kernel to fault the page
in and program the new physical mapping in the adapter.
- R.
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