Date: Fri, 18 Sep 1998 13:32:07 -0700 (PDT) From: Doug White <dwhite@resnet.uoregon.edu> To: Scott Smyth <smyth@bashful.realminfo.com> Cc: freebsd-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: memory allocation above "physical" memory (fwd) Message-ID: <Pine.BSF.4.03.9809181331060.11967-100000@resnet.uoregon.edu> In-Reply-To: <Pine.LNX.3.96.980918120819.606I-100000@bashful.realminfo.com>
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On Fri, 18 Sep 1998, Scott Smyth wrote: > > ---------- Forwarded message ---------- > Date: Fri, 18 Sep 1998 12:06:11 -0400 (EDT) > From: Scott Smyth <smyth@bashful.realminfo.com> > To: freebsd-hackers <freebsd-hackers@freebsd.org> > Subject: memory allocation above "physical" memory > > If the kernel is hacked to only know about 64 MB, is there > functionality already in the BSD kernel so allocate the memory > that may lie above what the kernel "knows" about. For instance, > in linux, vremap builds new page tables and returns a virtual > address you can use. So, I am looking for a function that > retrieves memory the kernel does not know about necessarily and > maps it to virtual addresses (whether or not it is contigous in > physical memory -- it may be). So, you're trying to implement hot-add memory?!?! > The example: physical memory the kernel knows: 64 MB, but the > real memory banks hold 96 MB. How can I access the top 32 MB? It doesn't work that way, sorry; you told the kernel you have 64MB of RAM, and it's going to hold you to that. Assuming you don't program in some functionality. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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