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Re: Device page

> I also want to make these minimal PV handling moved to some MI place - 
> probably
> uvm_page.c.  Now we don't define MI PV header yet, I'll allocate struct
> vm_page_md *[] for each XIP-capable device.  This will be put in uvm_page.c
> too.

For this part, I'll have a vm_page_md mapping for each device vm_physseg.
1:1 mapping of device-page -> vm_page_md.  I'll borrow pv_entry hash code
used in x86/pmap.c.  (Idea from rmind@.)


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