22 Dec
2009
22 Dec
'09
6:06 p.m.
[...]
Right, I think I understand now. So the obvious question to ask now is how is PCI configuration space mapped on Sparc64? I can see that on x86 it's mapped to an I/O port at 0xCF8 but I can't seem to find how this is implemented on Sparc64. Anyone have any idea?
PCI spaces are each mapped in separately in physical spaces on SPARC. On a Sun4u system, as I recall, the mappings are something like:
1fe.0000.0000-1fe.00ff.ffff : config-space (where it's bbddff, bus-device-function) 1fe.8000.0000-1fe.ffff.ffff: io space 1ff.0000.0000-1ff.ffff.ffff: 32-bit memory space
I'll get the exact addresses later on today. Also note there will be multiple such mappings, since we usually have multiple PCI roots.