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This patch extends the RAM session interface with the ability to allocate DMA buffers. The client specifies the type of RAM dataspace to allocate via the new 'cached' argument of the 'Ram_session::alloc()' function. By default, 'cached' is true, which correponds to the common case and the original behavior. When setting 'cached' to 'false', core takes the precautions needed to register the memory as uncached in the page table of each process that has the dataspace attached. Currently, the support for allocating DMA buffers is implemented for Fiasco.OC only. On x86 platforms, it is generally not needed. But on platforms with more relaxed cache coherence (such as ARM), user-level device drivers should always use uncacheable memory for DMA transactions. |
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This repository contains the port of Genode for Xilinx MicroBlaze-based platforms. It is based on an custom microkernel implementation, which is also part of this repository. To get an overview on the this platform and the underlying microkernel please refer to the introduction located at: ! <GENODE_DIR>/base-mb/doc/microblaze.txt To get a quick overview about how to work with this platform, you may read the getting-started guide located at: ! <GENODE_DIR>/base-mb/doc/getting_started.txt