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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.Hawaii.Edu!news.uoregon.edu!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!feed1.news.erols.com!news.ecn.uoknor.edu!news.cis.okstate.edu!nntp.ksu.edu!hptemp1.cc.umr.edu!nneul From: nneul@umr.edu (Nathan Neulinger) Newsgroups: comp.unix.programmer,comp.unix.internals,comp.unix.bsd.freebsd.misc,comp.unix.pc-clone.32bit Subject: Re: Allocating large blocks for memory Date: Sun, 17 Nov 1996 15:39:14 -0600 Organization: University of Missouri - Rolla Lines: 30 Distribution: world Message-ID: <nneul-ya023180001711961539140001@usenet.umr.edu> References: <56lq87$in7@rosebud.sdsc.edu> NNTP-Posting-Host: dialup-pkr-7-6.network.umr.edu Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: Yet Another NewsWatcher 2.3.1 Xref: euryale.cc.adfa.oz.au comp.unix.programmer:46455 comp.unix.internals:11292 comp.unix.bsd.freebsd.misc:31173 comp.unix.pc-clone.32bit:9582 | Hello everybody. | I am using FreeBSD 2.1.5 on a Pentium(PCI). I need to access | a hardware card which writes 1MB buffers in to the address I | provide it. The rub is that this 1MB must be contigous. I have | not been able to determine a memory allocation routine which | can give a this size block of memory. | | The idea of the program is to give the hardware a pointer | and when it interrupts read that pointer. I also need to | have another 1MB of contigous memeory ready for the hardware | so this means I have to develop some sort of mem block | management routine. | | Can anyone offer any suggestion? Thanks in advance. I may be wrong here, but I think you're totally out of luck unless you are writing kernel code. Even a large block of allocated memory in a process might not actually be contiguous due to paging/swapping/etc. The only place you'll be able to guarantee a contiguously allocated block of memory is to do it in the kernel source. -- Nathan ------------------------------------------------------------ Nathan Neulinger Univ. of Missouri - Rolla EMail: nneul@umr.edu Computing Services WWW: http://www.umr.edu/~nneul SysAdmin: rollanet.org