allocate high memory in the physical page allocator

[Amjad50]

Currently we only use max 128MB memory, this memory is mapped from 0 into the KERNEL_BASE and that's good since we can have something like 1:1 mapping and that's how physical2virtual function works.

But for more memory, we need to have a special physical page allocator, that doesn't have the memory virtually mapped, and thus we can't store the free pages as a linked list connected to one another by we can store the metadata about free pages in the heap somewhere since we have that.

The setup can be done as so.

• initial physical page allocator setup
• virtual memory setup
• [implied] heap setup (for us heap just works after virtual memory is initialized)
• allocate rest of ram into high physical page allocator
• Can use any amount of memory from ram