Re: Linux and real device drivers
Jamie Lokier (lkd@tantalophile.demon.co.uk)
Wed, 22 Sep 1999 15:49:09 +0200
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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