From: William Lee Irwin III <wli@holomorphy.com>
To: John Fusco <fusco_john@yahoo.com>
Cc: linux-kernel@vger.kernel.org
Subject: [vm 0/4] replace remap_page_range() with remap_pfn_range()
Date: Thu, 23 Sep 2004 19:17:35 -0700 [thread overview]
Message-ID: <20040924021735.GL9106@holomorphy.com> (raw)
In-Reply-To: <41535AAE.6090700@yahoo.com>
On Thu, Sep 23, 2004 at 06:22:22PM -0500, John Fusco wrote:
> I have a problem and I would like some comments on how to fix it.
> I have a custom PCI-X device installed in an IA32 system. The device
> expects to see a flat contiguous address space on the host, from which
> it reads and sends its data. The technique I used is right out of the
> O'Reilly Device Drivers book, which is to hide memory from the kernel
> with the 'mem=YYY' boot parameter. I then provide a mmap method to map
> the contiguous (hidden) memory into user space via a call to
> 'remap_page_range'.
> Everything worked great until we decided that we needed to install 6GB
> in this system. The problem is that remap_page_range() uses an unsigned
> long as the parameter for a physical address. On IA32, an unsigned long
> is 32-bits, but the IA32 is capable of addressing well over 4GB of RAM.
> So physical addresses on IA32 must be larger than 32 bits.
Do these patches work for you? Compiletested on sparc64.
-- wli
next prev parent reply other threads:[~2004-09-24 2:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-23 23:22 Problem with remap_page_range on IA32 with more than 4GB RAM John Fusco
2004-09-23 23:27 ` William Lee Irwin III
2004-09-24 2:17 ` William Lee Irwin III [this message]
2004-09-24 2:19 ` [vm 1/4] convert remap_page_range() to remap_pfn_range() William Lee Irwin III
2004-09-24 2:21 ` [vm 2/4] convert io_remap_page_range() to call remap_pfn_range() William Lee Irwin III
2004-09-24 2:23 ` [vm 3/4] convert direct callers of remap_page_range() William Lee Irwin III
2004-09-24 2:25 ` [vm 4/4] remove remap_page_range() William Lee Irwin III
2004-09-24 2:27 ` [vm 3/4] convert direct callers of remap_page_range() William Lee Irwin III
2004-09-24 3:29 ` [vm 0/4] replace remap_page_range() with remap_pfn_range() William Lee Irwin III
2004-09-24 3:22 ` Is there a node-affinity memory allocation benchmark? Annie
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