Re: pmap vs. large Zorro III space

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

On Fri, 22 Jul 2011, Rados�Baw Kujawa wrote:

> I checked out pmap_init and I see only two places where uvm_km_suballoc 
> is called. One is allocation of segment table map, and the other is 
> allocation of page tables map. Michael Hitch suggested, that it is 
> probaby related to page tables map allocation and that I might want to 
> increase VM_KERNEL_PT_PAGES (defined in vmparam.h). I've tried 
> increasing it a bit (to 12, 15, 24), but no change was visible. 
> Increasing the value too much (for example to 32) leads to a different 
> kind of panic: http://c0ff33.net/pmappanic2.jpg
>
> I won't act like I know what's going on in pmap code, because I don't 
> know. Any sugestions would be highly appreciated.

  One other thing I was thinking is that the user page tables start at a 
fixed address of 0x10000000 (see M68K_PTBASE in 
amiga/include/pte_motorola.h).  There may not be enough address space 
between the kernel and M68K_PTBASE to fit everything.

  You might try moving that to 0x20000000.

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