Interface: Memory allocation

[Qix-]

The memory allocation interface(s) allow the allocation of physical pages at runtime, as well as for the management of memory mappings in the instance's / thread's address space.

These are particularly sensitive to design given a few considerations:

• Port buffers must work with these
• "Priority" allocations, such as DMA memory regions
• Physical allocation checks during mapping
• Avoiding exposing direct paddrs to the userspace processes (security concern)

Further, given the kernel avoids working with any linear data (except in the case of ports) much of this must be performed in "constant space" via the ABI.