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EmbeddedPkg/CoherentDmaLib: add support for non-1:1 DMA translation

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Bring CoherentDmaLib in line with ArmDmaLib, and add support for
defining a static offset between the host's and the bus master's
view of memory.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel
2017-08-30 08:02:15 +01:00
parent 7385d2543e
commit 0bcb801067
3 changed files with 19 additions and 1 deletions
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7
EmbeddedPkg/EmbeddedPkg.dec
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@@ -205,3 +205,10 @@
[PcdsFixedAtBuild.common, PcdsDynamic.common]
gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L""|VOID*|0x00000055
#
# Value to add to a host address to obtain a device address, using
# unsigned 64-bit integer arithmetic. This means we can rely on
# truncation on overflow to specify negative offsets.
#
gEmbeddedTokenSpaceGuid.PcdDmaDeviceOffset|0x0|UINT64|0x0000058