On Fri, Dec 14, 2001 at 06:10:52PM -0800, Sottek, Matthew J wrote:
> >The vm does zap_page_range for you if you're implementing an
> >mmap operation,
>
> It only does zap_page_range() when the memory map is being
> removed right?
Right.
> I have a 64k sliding "window" into a 1MB region. You can only access
> 64k at a time then you have to switch the "bank" to access the next
> 64k. Address 0xa0000-0xaffff is the 64k window. The actual 1MB of
> memory is above the top of memory and not directly addressable by the
> CPU, you have to go through the banks.
Stop right there. You can't do that. The code will deadlock on page
faults for certain usage patterns. It's slow, inefficient and a waste
of effort.
-ben
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:29 EST