lkml.org 
[lkml]   [2006]   [Sep]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Bug] 2.6.18-rc6-mm2 i386 trouble finding RSDT in get_memcfg_from_srat
On Thu, Sep 14, 2006 at 04:21:33PM -0700, Dave Hansen wrote:
> On Thu, 2006-09-14 at 19:04 -0400, Vivek Goyal wrote:
> > I think I know what is going on wrong here. boot_ioremap() is assuming
> > that only first 8MB of physical memory is being mapped and while
> > calculating the index into page table (boot_pte_index) we will truncate
> > any higher address bits.
>
> Vivek, are those pte pages still all contiguous?
>

Yes, they are. (arch/i386/kernel/head.S)

> Yeah, that's probably it. Keith, I'm trying to think of reasons why we
> need the mask here:
>
> #define boot_pte_index(address) \
> (((address) >> PAGE_SHIFT) & (BOOT_PTE_PTRS - 1))
>
> and I can't think of any other than just masking out the top of the
> virtual address. You could do this a bunch of other ways, like __pa().
>
> This might just work:
>
> static unsigned long boot_pte_index(unsigned long vaddr)
> {
> return __pa(vaddr) >> PAGE_SHIFT;
> }
>

This looks good. Should work.

Thanks
Vivek
-
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: 2006-09-15 01:39    [W:0.504 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site