[Differential] [Request, 1, 520 lines] D2357: Port x86 busdma to ARM64

[zbb (Zbigniew Bodek)]

zbb created this revision.
zbb added reviewers: emaste, ian, imp, andrew.
zbb added a subscriber: freebsd-arm.
Herald added a subscriber: emaste.

REVISION SUMMARY
  The x86 busdma subsystem allows using multiple implementations.
  By default the classic bounce buffer approach is used, however
  on systems with IOMMU it could be in runtime switched to more
  efficient hardware accelerated implementation.
  
  This commit adds ARM64 port of the x86 busdma framework and bounce
  buffer backend. It is ready to use on IO coherent systems. If the
  IO coherency cannot be guaranteed, the cache management operations have
  to be added to this code in places marked by /* XXX ARM64TODO (...) */
  comments. Also IOMMU support might be added by registering another
  busdma implementation like it is already done on the x86.
  
  Obtained from: Semihalf
  Sponsored by: The FreeBSD Foundation

REVISION DETAIL
  https://reviews.freebsd.org/D2357

AFFECTED FILES
  sys/arm64/arm64/busdma_bounce.c
  sys/arm64/arm64/busdma_machdep.c
  sys/arm64/include/bus_dma.h
  sys/arm64/include/bus_dma_impl.h
  sys/conf/files.arm64

EMAIL PREFERENCES
  https://reviews.freebsd.org/settings/panel/emailpreferences/

To: zbb, emaste, ian, imp, andrew
Cc: emaste, freebsd-arm
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