Re: CVS commit: [uebayasi-xip] src/sys/uvm

[Masao Uebayashi <uebayasi%tombi.co.jp@localhost>]

> > Log Message:
> > Implement device page struct vm_page * handling.
> 
> what will happen if sizeof(uintptr_t) < sizeof(paddr_t)?

I plan to change the encoding as something like:

        bit
        31-11   page offset in vm_physseg
        10- 2   index of device vm_physseg[]
         1- 0   magic

Assuming:
        - # of device vm_physsegs is <256
        - one vm_physseg space is <vaddr_t (not paddr_t)

On LP32 / 4K page platforms, you can have 4GB x 256 device vm_physsegs, which
is good enough for "LP32 with 64-bit physical address space platforms" IMO.

Masao

-- 
Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635