Manu Abraham schrieb:
On 7/11/07, Nobin Mathew <[email protected]> wrote:
See this in the documentation
The returned virtual address is a current CPU mapping for the memory
address given. It is only valid to use this function on addresses that
have a kernel mapping
This function does not handle bus mappings for DMA transfers. In
almost all conceivable cases a device driver should not be using this
function
To get a better idea, look here
http://tldp.org/LDP/khg/HyperNews/get/devices/addrxlate.html
Very nice! I have two more questions:
1. Is the document up to date?
2. Can anybody give an example how to "map" lots of pages (which
got filled by i.e. a scatter gather DMA chain) from a driver
(kernel space) to userspace?
Thanks
--
Clemens Koller
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