lkml.org 
[lkml]   [2006]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: reserve memory in low physical address - possible?
Jun Sun wrote:
> This question is specific to i386 architecture. While I am fairly
> comfortable with Linux kernel, I am not familiar with i386 arch.
>
> My objective is to reserve, or hide from kernel, some memory space in low
> physical address range starting from 0. The memory amount is in the order
> of 100MB to 200MB. The total memory is assumed to be around 512MB.
>
> Is this possible?
>
> I understand it is possible to reserve some memory at the end by
> specifying "mem=xxxM" option in kernel command line. I looked into
> "memmap=xxxM" option but it appears not helpful for what I want.
>
> While searching on the web I also found things like DMA zone and loaders
> etc that all seem to assume the existence low-addressed physical
> memory. True?
>
> I can certainly workaround the loader issue. I can also re-code the real-mode
> part of kernel code to migrate to higher addresses. The DMA zone might be
> a thorny one. Any clues? Are modern PCs still subject to
> the 16MB DMA zone restriction?
>
> Am I too far off from what I want to do?
>
> Thanks.
>
> Jun

Maybe the bigphysarea patch is what you want?

Mark

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-31 13:49    [W:0.762 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site