RE: virtual / physical address translation

> I want to access a PCI device through its memory space. I 
> have the physical addresses from the device's BARs. How can I 
> post memory write commands to the device?
> How do I convert from physical to virtual addresses and the 
> virtual to physical addresses?
> Thanks

Take a look at any of the recent pci drivers that use the pci BAR to
obtain the device address such as:

e1000.c
forcedeth.c
ns83820.c
r8169.c
tg3.c

The device address reported by the device is the physical and in read
and writes you can use that address as the io address.  The only place
converting from physical to virtual addresses come in is in attempting
to assign a memory addess to cars capable to DMA.  In that case you can
also revied the drivers above specifically in the init_rings buffers
addresses are assigned to the card.

TIm

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