Messages in this thread | | | From | "David S. Miller" <> | Date | Tue, 3 Jul 2001 00:18:58 -0700 (PDT) | Subject | Re: virt_to_bus and virt_to_phys on Apple G4 target |
| |
mdaljeet@in.ibm.com writes: > 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?
virt_to_bus() and bus_to_virt() are deprecated interfaces and should not be used by anything new. See Documentation/DMA-mapping.txt for details.
Later, David S. Miller davem@redhat.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |