Memory under APUS

[Alan B. <al...@ms...>]

hi,

Can someone please re-educate or inform me of the memory
layout system under APUS?  I recall we are a bit 'weird'
in that memory does not start at 0x00000000

my problem has arisen in that I find some code that I'm needing
to fix....the code does the following.

it takes two values,   0x2100 and 0x3000 and then tries to find a size
of 0x10 available (stepping through the memory space in +4 steps

the function operating on this memory is phys_to_virt()

I note in the bootuyp that APU does some IORemapping

fffc0000   ->  fdfff000
fffe0000   ->  fdffe000     these occur early on

fffc0000   ->  c6000000
fffe0000   ->  c6002000
e0000000   ->  c6004000
ef010000   ->  c6805000     these occur later.

a few weird numbers in there....

can anyone help as to where i really should be allocating such memory?

(I altered the function to look between 0x4000 and 0x5000 and it did find
some free space.... well, is a resulting area on something like 0xc000000
but then the program Kernel panic'ed  (not suprising really! ;-) )

Alan