Re: Question about ioremap and io_remap_page_range

[Ingo Molnar]

On Thu, 27 Sep 2001, [GB2312] Êæ¹úÇ¿ wrote:

>  Here is some rather basic questions I want ask ,any reply or comment
>  please CC to my emailbox,thank you very much.
>
>  When I work with kernel 2.4.2 in Intel X86 , I use
>
>      VIRT_ADDR = ioremap(BUS_ADDR); to map a section of PCI memory, and
>      X_ADDR = virt_to_phys(VIRT_ADDR);

i'd suggest to read Documentation/DMA-mapping.txt in any recent kernel
source, the bus_to_virt()/virt_to_phys() interface is obsolete and has
been replaced by the pci_alloc_*/pci_map_*/pci_free_*() dynamic
DMA-mapping API. You can find some nice examples of usage in
drivers/net/*.c.

	Ingo