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Re: Current kernel with http://gnats.netbsd.org/39965 and pmap patches
On Thu, Dec 18, 2008 at 4:16 PM, Izumi Tsutsui
> tjamaloo%gmail.com@localhost wrote:
>> Thanks for the patch. I applied it and tested with 030, but unfortunately
>> panics right after it has loaded installer to ram disk with:
> Ok, I was actually confused.
> Now I think current Sysptmap code is correct.
> - 4KB/page systems require 4MB address space for page tables
> to handle whole 4GB address space.
> - 8KB/page systems require 2MB PT pages to handle 4GB range.
> - Sysptmap should be mapped as a part of Sysmap in pmap code.
> - On 4KB page systems, Sysmap is allocated at 0xffc00000
> and its range is from 0xffc00000 to 0xffffffff,
> so Sysptmap_pa should be mapped at the end of KVA.
> - On 8KB/page systems, Sysmap is allocated at
> 0xff000000 (-PAGE_SIZE * NPTEPG) so its range is from
> 0xff000000 to 0xff1fffff, i.e. there is some unused region.
> This means Sysptmap_pa should be registered in
> the PTE entry at &((pt_entry_t *)Sysptmap)[256 - 1],
> not at [NPTEPG - 1] which 4KB/page systems use.
> Maybe we should replace some NPTEPG macro (that is actually TIB_SIZE)
> with TIA_SIZE, which the "256" means.
Thanks for good explanation! I'm totally new to pmap and I guess I'm just
starting to be confused ;). Anyway I splitted atari/atari/pmap.c to two files:
atari/atari/pmap.c and atari/atari/pmap_bootstrap.c. I think it's better that
way and it's easier to test m68k and Atari specific pmap's.
Here's link to new patch (includes also atari/include/vmparam.h, /atar/conf/
files.conf and atari/atari/pmap_bootstrap.c):
> Anyway, I'll try to see if there is more possible pitfall
> for 8KB page systems in m68k pmap code...
I tried kernel with m68k/m68k/pmap_motorola.c and it failed with 030 as well.
Kernel prints following error:
panic: pool_put: buf8k: page header missing.
Maybe this is indicator that there's something wrong with 8KB page systems ?
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