[PATCH v2 0/4] ArmPkg: more ArmDmaLib fixes

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Using patch #4 in anger (which was the only patch in the v1 submission of
this series) revealed some issues in the ArmDmaLib code related to abuse
of the device address where a CPU physical address (which usually, but
not always translates 1:1 to a CPU virtual address) was dereferenced by
the CPU.

Patch #1 is an unrelated fix that drops the direct dependency on ArmLib.

Patch #2 adds a missing virtual-to-physical conversion (which is required
when DebugUncachedMemoryAllocationLib is in use)

The device address of a DMA mapping is not to be dereferenced by the CPU,
especially not after patch #4 is applied, which allows the bus view and
the CPU view to be shifted by a fixed offset. So patch #3 corrects some
wrong uses of the device address.

Patch #4 is the original patch, with some in-code comments added to further
clarify how the offset should be specified, and why ConvertToPhysicalAddress()
needs to be called before taking this offset into account.  

Ard Biesheuvel (4):
  ArmPkg/ArmDmaLib: use DMA buffer alignment from CPU arch protocol
  ArmPkg/ArmDmaLib: fix incorrect device address of double buffer
  ArmPkg/ArmDmaLib: clean up abuse of device address
  ArmPkg/ArmDmaLib: add support for fixed host-to-device DMA offset

 ArmPkg/ArmPkg.dec                      |  8 +++
 ArmPkg/Library/ArmDmaLib/ArmDmaLib.c   | 51 +++++++++++++-------
 ArmPkg/Library/ArmDmaLib/ArmDmaLib.inf |  3 +-
 3 files changed, 42 insertions(+), 20 deletions(-)

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2.7.4