Hi,
On Wed, May 24, 2000 at 04:36:19PM +0200, Jan Evert van Grootheest wrote:
>
> The mmap() system call seems to be the way for the app to do this, since
> it knows the information it needs to use it. But I'm not sure how to
> implement the mmap file operation on the driver side.
Have a look at the mmap support in the sound drivers, it does all
you should need already.
> A second question is if the page could possibly be swapped out. I'd like
> (perhaps need) to prevent that from happening. Would PG_locked do the
> trick here?
The normal mechanism is just to set the PG_Reserved bit, which tells the
VM to leave the page alone. PG_locked is just used as a temporary I/O
interlock.
--Stephen
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