Messages in this thread | | | Date | Wed, 22 Sep 1999 15:49:09 +0200 | From | Jamie Lokier <> | Subject | Re: Linux and real device drivers |
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Momchil Velikov wrote: > Ok, folks, I think we are talking about "udi_pio_trans" call > (in UDI Physical I/O Specification) and this call is surely not meant > to perform a single I/O port or MMIO read/write. Instead the UDI > implementation executes a large transaction including many > reads, writes, arithmetic operations, branches, etc. > Now, the overhead is by no means in the call, it's in interpreting > the transaction description and I'd say yes, it ought to be rather > big.
... unless the descriptions are static so that udi_pio_trans can pre-compile them. In which case it would be rather neat as it'd support more bus combinations that we do in Linux.
-- Jamie
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