Re: kmem changes in -current

["Michael L. Hitch" <mhitch%lightning.msu.montana.edu@localhost>]

On Wed, 8 Feb 2012, Radoslaw Kujawa wrote:

> This is not directly related, but if we are speaking about m68k pmap... 
> There are severe problems in the setups where large amount of kernel 
> address space is needed. Typical case on amiga port is situation where 
> user has a lot of Zorro I/O boards, or just a large board. Currently, it 
> is not even possible to boot the NetBSD on such machines, because 
> M68K_PTBASE is statically set to 0x10000000. For most setups it is 
> possible to work around the problem by moving PTBASE to a higher 
> address. Now I wonder, if it is possible to fix the 68k pmap 
> implementation, to allow dynamic setting of M68K_PTBASE?

  The original amiga pmap did this, so it should just be a matter of 
changing pmap_motorola.c to use a computed value, and just setting that 
value to M68K_PTBASE for all the other m68k ports.  Or, perhaps better, 
would be to default the base to M68K_PTBASE and let that base be 
overridden by any port that needs it.  I think the amiga initialization 
still computes the base, but the result is no longer used.

Mike

--
Michael L. Hitch                        mhitch%montana.edu@localhost
Computer Consultant
Information Technology Center
Montana State University        Bozeman, MT     USA