Date: Sat, 19 Apr 1997 07:12:56 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-hackers@freebsd.org, krygier@kph.uni-mainz.de, toor@dyson.iquest.net Subject: Re: special memory device Message-ID: <199704191212.HAA08758@dyson.iquest.net> In-Reply-To: <19970419102301.FO34910@uriah.heep.sax.de> from J Wunsch at "Apr 19, 97 10:23:01 am"
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> As Klaus Werner Krygier wrote: > > > This means that the notification about the page fault > > seems to be done by calling the driver's mmap routine. Here I can > > reprogram the interface card. The validation of the now visible window > > is done automatically. The only problem that remains is, how to invalidate > > the pages for the old window so that a page fault will be generated > > again if this window is accessed later. > > Ask John. :) I think you gotta call some *unmap() function, but i'm > not confident with the API, and John never got around to actually > write something like a man page for the VM system (hint, hint :). > I have the question in my queue. Hope to answer it by the end of the weekend. I think that I'll have to craft a subroutine, but it won't be very complicated. I understand about the lack of documentation, the code has stabilized significantly. There'll be some nice stuff coming along again, but I think that the days of vast changes are over. That makes me much less resistant to documentation. The only problem now is time limitations :-(. More good news about the VM code is that we appear to have more competent VM people now. It is suprising to see the really correct fixes coming through!!! :-). John
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