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From: "Justin T. Gibbs" <gibbs@FreeBSD.org>
Date: Mon, 28 Dec 2009 18:59:13 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/xen/blkfront blkfront.c
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gibbs       2009-12-28 18:59:13 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/xen/blkfront blkfront.c 
  Log:
  SVN rev 201138 on 2009-12-28 18:59:13Z by gibbs
  
  Correct alignment and boundary constraints in blkfront's bus dma tag.  The
  blkif interface in Xen requires all I/O to be 512 byte aligned with each
  segment bounded by a 4k page.
  
  Note: This submission only documents the proper contraints for blkif I/O.
        The alignment code in busdma does not yet handle alignment constraints
        correctly in all cases.
  
  Revision  Changes    Path
  1.15      +2 -2      src/sys/dev/xen/blkfront/blkfront.c