Figure out a sane memory API

[pczarn]

We have a few abstractions for both physical and virtual memory management. Some methods (set, set_addr) need a second thought and documentation, whereas identity_map needs improvement.

Both i686 and ARM use paging schemes with two levels.

Perhaps use slices and iterators for virtual memory manipulation?

• Implement intrusive linked lists for BuddyAllocator and VmAreas: https://gist.github.com/bgamari/6a4e3d7673e71704c302
• Implement demand paging and CoW.

[pczarn]

The Linux kernel uses a list of vm_area_structs that hold all information stored in the architecture-specific page table and everything else needed to fully describe a memory area.

http://duartes.org/gustavo/blog/post/how-the-kernel-manages-your-memory/