Re: your mail

David Mosberger
2002-05-20T18:07:42Z

>>>>> On Thu, 16 May 2002 21:24:10 +0530 (IST), Sanket Rathi <sanket.rathi@cdac.ernet.in> said:

Sanket> No actually i don't want that for DMA it is for diffrent
Sanket> requirment. actually in our device there is a page table in
Sanket> device which have virtual to physical address translation we
Sanket> save virtual address in device and corresponding physical
Sanket> address. but we can store only upto 44 bit information of
Sanket> virtual address thats why i want that.

Sanket> Can you help me in this

There is no way to limit virtual memory to 44 bits. I don't know how
your device works, but just fyi: ia64 divides the address space into 8
equal-sized regions and user space applications tend to use at least
two regions (2 for text and 3 for data/stack). This means that even
with the smallest page size, you'll have to take virtual address bits
61-63 into account.

Hope this helps,

--david
--
Interested in learning more about IA-64 Linux? Try http://www.lia64.org/book/