Add PhysBuf for DMA #16
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For now a naive solution is to reallocate if the space is not contiguous in physical memory. |
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When we allocate on the heap, the next three frames after the first allocated frame are used to create new page tables, and are therefor unavailable.
If we allocate a buffer larger that the space available in the first frame, it will then use the fifth frame, but if we use the buffer for DMA the frames used for the page tables will be overwritten.
https://docs.rs/x86_64/0.8.3/x86_64/structures/paging/mapper/trait.Mapper.html#tymethod.map_to
https://docs.rs/x86_64/0.8.3/src/x86_64/structures/paging/mapper/mapped_page_table.rs.html#92