From: Pauline Middelink <middelink@polyware.nl>
To: linux-kernel@vger.kernel.org
Subject: Re: mapping physical memory
Date: Fri, 26 Jan 2001 17:28:56 +0100 [thread overview]
Message-ID: <20010126172856.A8069@polyware.nl> (raw)
In-Reply-To: <fa.h16635v.l0uu8m@ifi.uio.no> <027801c08784$48a04630$0701a8c0@morph>
In-Reply-To: <027801c08784$48a04630$0701a8c0@morph>; from dmaas@dcine.com on Fri, Jan 26, 2001 at 05:39:38AM -0500
On Fri, 26 Jan 2001 around 05:39:38 -0500, Dan Maas wrote:
> > I need to be able to obtain and pin approximately 8 MB of
> > contiguous physical memory in user space. How would I go
> > about doing that under Linux if it is at all possible?
>
> The only way to allocate that much *physically* contiguous memory is by
> writing a driver that grabs it at boot-time (I think the "bootmem" API is
> used for this). This is an extreme measure and should rarely be necessary,
> except in special cases such as primitive PCI cards that lack support for
> scatter/gather DMA.
Or is you want to reuse that memory between apps, use the bigphysarea
patch. Yes, its available for 2.4.0 now :)
Met vriendelijke groet,
Pauline Middelink
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next prev parent reply other threads:[~2001-01-26 16:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.h16635v.l0uu8m@ifi.uio.no>
2001-01-26 10:39 ` mapping physical memory Dan Maas
2001-01-26 16:28 ` Pauline Middelink [this message]
2001-01-26 3:53 Dima Brodsky
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