Date: Fri, 18 Sep 1998 10:06:08 -0700 From: Mike Smith <mike@smith.net.au> To: Scott Smyth <smyth@bashful.realminfo.com> Cc: freebsd-hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: memory allocation above "physical" memory Message-ID: <199809181706.KAA00787@word.smith.net.au> In-Reply-To: Your message of "Fri, 18 Sep 1998 12:06:11 EDT." <Pine.LNX.3.96.980918115112.606H-100000@bashful.realminfo.com>
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> 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). > > 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? > Does functionality exist for: > 1) getting page tables; > 2) mapping page tables to virtual addresses. In most cases this is already taken care of; there should be no systems on which physical memory is not correctly sized if you are running a recent release or 3.0-current. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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