lkml.org 
[lkml]   [2002]   [Sep]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Calculating kernel logical address ..
From
   From: Daniel Phillips <phillips@arcor.de>
Date: Sat, 7 Sep 2002 03:44:53 +0200

It looks good to me. Note that somebody has added some new voodoo in 2.5
so that page table pages can be in highmem, with the result that the above
code won't work in 2.5, whether or not highmem is configured.

The example given won't work for kernel text/data addresses on a few
platforms (sparc64 is one). And in fact on MIPS the KSEG0 pages lack
any page tables.

There are only three things one can portably obtain a physical address
of:

1) A user address, for a known MM

2) a kmalloc/get_free_page kernel page

3) A vmalloc page

For anything else you're in non-portablt land, including and
in partiular:

1) kernel stack addresses
2) addresses within the main kernel image text/data/bss
-
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: 2005-03-22 13:28    [W:0.095 / U:1.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site