mirror of https://github.com/acidanthera/audk.git
df8c2668d7
In preparation of adding support to ArmDmalib for DMA bus masters whose view of memory is offset by a constant compared to the CPU's view, clean up some abuse of the device address. The device address is not defined in terms of the CPU's address space, and so it should not be used in CopyMem () or cache maintenance operations that require a valid mapping. This not only applies to the above use case, but also to the DebugUncachedMemoryAllocationLib that unmaps the primary, cached mapping of an allocation, and returns a host address which is an uncached alias offset by a constant. Since we should never access the device address from the CPU, there is no need to record it in the MAPINFO struct. Instead, record the buffer address in case of double buffering, since we do need to copy the contents (in case of a bus master write) and free the buffer (in all cases) when DmaUnmap() is called. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> |
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| .. | ||
| Drivers | ||
| Filesystem/SemihostFs | ||
| Include | ||
| Library | ||
| ArmPkg.dec | ||
| ArmPkg.dsc | ||
| Contributions.txt | ||
| License.txt | ||