Doug,
Thanks for the reply, I'll check it out. However
if you'll notice in my prev mail, I stated that I was
trying to contigmalloc 4K... Hard to believe that
the system doesnt have 4K lying around.
- Tom
On Thu, 30 May 2002, Doug White wrote:
On Thu, 30 May 2002, Tom Tang wrote:
I have a question about implementing mmap functions in
device drivers. Thinking it would be simple, I contigmalloc'd
a buffer of PAGE_SIZE and returned it using atop like other
mmap device implementations. However when my userland program
mmaps the device with offset 0, when I try accessing the returned
pointer, it returns me invalid memory address. Any help would
be appreciated...
Generally, after the machine is started, memory gets too fragmented to use
contigmalloc.
If you preload the module and do the contigmalloc at attach time it should
succeed.
Doug White| FreeBSD: The Power to Serve
[EMAIL PROTECTED] | www.FreeBSD.org
--
Tom Tang
[EMAIL PROTECTED]
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