Messages in this thread | | | Date | Fri, 26 Mar 2004 17:58:29 +0800 | From | Hugang <> | Subject | Re: Problem with remap_page_range/mmap |
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On Fri, 26 Mar 2004 09:46:56 +0000 Christoph Hellwig <hch@infradead.org> wrote:
> On Fri, Mar 26, 2004 at 10:36:19AM +0100, Christian Leber wrote: > > What would be the good idea? I need at least 8 at least 4MB (2MB are > > enough for 2.4) big physical memory pieces for DMA, mapped to > > userspace. > > > > remap_page_range for ia64. > > Put the page structs into an array and return them from ->nopage. The > kernel pagefault code will set up the ptes for you. > > Now actually getting 4MB of continguous memory is a different issue.. > > I'm surprised you actually managed to get the allocation to succeed.
There is more detailed information about make page usable to user space, http://www.xml.com/ldd/chapter/book/ch13.html
Hope that's useful.
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