shmif: export LOCK_* definitions

They will be used by upcoming shmif_pcapin.

make constant unsigned

Make shmif buildable when DRPINTF enabled

Bump SHMIF_VERSION

Make shmif SIMPLEX

Add a sender field to a packet header on a shmif bus to identify
and ignore packets sent by itself.

This makes shmif work with bridges.

ok pooka@

header massage, mostly improves portability

Update copyright statements.

no functional change.

Move the lockops together with the interface -- they are needed
only at runtime.

Include a timestamp in the frame header. When converting to pcap,
it can give some idea of when packets were sent.

nb. it's the sending host's timestamp, not an observer timestamp
like in the typic

Include a timestamp in the frame header. When converting to pcap,
it can give some idea of when packets were sent.

nb. it's the sending host's timestamp, not an observer timestamp
like in the typical pcap case.

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Include a pointer to the beginning of the buffer and add support
to the packet dumper. This helps in situations where the juicy
details are in a bus multiple generations old.

* include a magic number in the bus format
* simplify offset calculations by making them start from beginning of data

Make shmif memory access slightly more sane. Create a header which
is shared by the interface and the bus analyzer.