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cem
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2015-10-14T23:48:03.748652Z
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NTB: Abstract doorbell register access

The doorbell registers (and associated mask) are 16-bit on Xeon but
64-bit on SoC.  Abstract IO access to doorbell registers with
'db_ioread' and 'db_iowrite' (names and idea borrowed from the dual
BSD/GPL Linux driver).

Sponsored by:	EMC / Isilon Storage Division

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