K 10
svn:author
V 3
bms
K 8
svn:date
V 27
2004-07-09T02:28:23.000000Z
K 7
svn:log
V 487
Further improve locking in xl(4):

 - Avoid an additional lock acquire/release when leaving xl_intr(), by
   changing xl_start*() to xl_start*_locked(), and calling the appropriate
   routine by chip revision (as the DMA descriptors are different).

 - Simplify the appropriate routines now that they are called with the
   lock held.

This should save a significant amount of CPU cycles spent on servicing
each interrupt for both UP and SMP whilst remaining MPSAFE.

Tested by:	rwatson

END