bfe(4) patch for phymem > 1GB box

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

Hi all,

following patch is taken from FreeBSD to make bfe(4) work on some box
with >1GB memory:
http://leaf.dragonflybsd.org/~sephe/bfe_dma.diff

Please test/review it.  If no objection comes I will commit it three days later.

Best Regards,
sephe

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