Virtual memory manager about annos HOT 5 OPEN

Need to setup some preliminary tables at boot, so we can use higher half addressing (kernel mapped at the higher half, > 0x8000000 virtual) from the start. Every major OS does that. Might help. Read http://wiki.osdev.org/Higher_Half_Kernel, it has more arguments than I do.

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See 5e1d877. It's a beginning.

Higher half is used.

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Added allocation methods at 82b0a16.

But we still have to do

• allocation of uncontiguous physical pages. This isn't possible yet.
• deallocation of virtual pages
• checking if that virtual page allocation can be contiguous. We allocate only contiguous virtual pages.

After doing the tasks above, this issue should be closed

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1dae61f does deallocation.

It also adds a flag to the mapping. It maps with the page table mapping options, such as read-only page, or non-cached page.

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I'm thinking about doing the heap allocator (#7 ) now.

It would help catching some errors in the VMM, since it's the only thing I can't test separately, prior to put here (the PMM was tested a little in user mode before integrating here, and I'm doing the heap allocator in user mode too)

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