virt_to_bus and virt_to_phys on Apple G4 target

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I am running linux 2.4.2 on Apple G4 machine. I think the 'PCI bus
addresses' and 'physical addresses' are same on this architecture. I
expected the two be different but according to asm/io.h 'virt_to_bus(addr)
= virt_to_phys(addr) + PCI_DRAM_OFFSET'. I printed the value of
'PCI_DRAM_OFFSET' and that come out to be zero. Is this correct?

If I somehow get the physical address of a user space buffer in a module
and take this as a PCI bus address, will I be able to do DMA properly?

thanks,
Daljeet.

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