From owner-freebsd-hackers  Sun Sep 20 12:29:58 1998
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Date: Sun, 20 Sep 1998 21:29:10 +0200
From: Eivind Eklund <eivind@yes.no>
To: Bill Paul <wpaul@skynet.ctr.columbia.edu>, hackers@FreeBSD.ORG
Subject: Re: malloc()ing 64K physically contiguous buffer in kernel
References: <199809201745.NAA21711@skynet.ctr.columbia.edu>
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In-Reply-To: <199809201745.NAA21711@skynet.ctr.columbia.edu>; from Bill Paul on Sun, Sep 20, 1998 at 01:45:24PM -0400
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On Sun, Sep 20, 1998 at 01:45:24PM -0400, Bill Paul wrote:
> So: is there some way to allocate 64K of contiguous memory? Or even
> 8/16/32K? As long as I can hit one of the allowed buffer sizes I'll
> be happy, although I wanted 64K in order to reduce the likelyhood of
> receiver overruns.

contigmalloc().

The function itself is in src/sys/vm/vm_page.c

Prototype is in src/sys/sys/malloc.h and src/sys/vm/vm_kern.h (I have no
idea why it is both places).

Examples of use in
src/sys/dev/dpt/dpt_scsi.c
src/sys/i386/i386/busdma_machdep.c
src/sys/i386/isa/bs/bsif.c
src/sys/i386/isa/sound/soundcard.c
src/sys/i386/isa/gsc.c
src/sys/i386/isa/if_sr.c
src/sys/i386/isa/asc.c
src/sys/i386/isa/isa.c
src/sys/i386/isa/snd/dmabuf.c
src/sys/kern/uipc_mbuf.c
src/sys/pc98/pc98/pc98.c

No man page, and no reference in malloc(9) :-(

Eivind.

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