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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 dummy implementations of platform-specific Genode APIs to enable the compilation of Genode for the host platform. Because the repository provides only dummy implementations, most of the generated binaries will not work. However, the repository serves two important purposes. It documents the platform- specific APIs that must be filled out when porting Genode to another platform, and it is the build environment for unit tests executed on the host platform.