[OpenBIOS] Haiku/ppc progress - ofmem_claim misbehavior?

[Andreas Färber]

Am 24.05.2010 um 16:22 schrieb Stefan Reinauer:

> On 5/24/10 4:18 PM, Andreas Färber wrote:
>> +        phys = ofmem_claim_phys_( addr, size, align, 0,
>> get_ram_size() - 0x00100000 - (2 << 15) - (32 + 32 + 64) * 1024, 1 /*
>> reverse */ );
>> +        virt = ofmem_claim_virt_( addr, size, align, 0,
>> get_ram_size() - 0x00100000 - (2 << 15) - (32 + 32 + 64) * 1024, 1 /*
>> reverse */ );
> This kind of yells for a comment explaining what those numbers are.

These are ppc-specific magic numbers in common code where they have no  
business being - please don't apply!

The question is, why does claim overwrite the 0x07ed0000 identity map  
of length 1245184, that I see no in my debug output now, with a  
0x07f00000 map when using the vanilla OpenBIOS code?
And do we need to supply platform-specific functions arch_get_ram_top  
and arch_get_ram_bottom, or is my approach just working around the  
problem?

Andreas