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% $RCSfile: ns8390.tex,v $
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% $Revision: 1.1 $
% $Date: 1995/07/28 21:19:13 $
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\protspec{NS8390}{NS8390 (Mach3 in-kernel ns8390 ethernet driver)}
\index{ns8390}

\topic{SPECIFICATION}

\noindent

NS8390 is a Mach in-kernel ethernet driver, presenting both a
mach kernel interface and an \xk{} interface.


\topic{SYNOPSIS}

\noindent 

Each instantiation of NS8390 is associated with a single ethernet
device.  NS8390 can be configured to either copy incoming packets
to both the \xk{} and the standard Mach networking interface (thus
both the in-kernel \xk{} and the Unix server will see packets) or to
bypass the Mach interface and not allow the Unix server to see any
packets. 

If compiled with ALLOW\_NON\_XK\_USERS defined, NS8390 will 
allow non-\xk{} users to send and receive network packets through the
standard Mach interfaces.


\topic{REALM}

NS8390 is in the ASYNC realm, supporting the ethernet driver interface
described in the ETH appendix.


\topic{PARTICIPANTS}

NS8390 supports the ethernet driver interface rather than a standard
xkernel UPI interface and thus makes no use of participant stacks.


\topic{EXTERNAL INTERFACE}

NS8390 supports the ethernet driver interface
described in the ETH appendix.


\topic{CONFIGURATION}

NS8390 requires no lower protocol.  The last digit of the instance
name must correspond to the unit device number for the particular
instantiation.  E.g., 

\medskip

{\tt name=ns8390/el0;}

\medskip

\noindent for device 0.


\topic{AUTHOR}

\noindent Hasnain Karampurwala (modifications to Mach
kernel source distribution)