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Subject[PATCH] Simple brk allocator for very early allocations

This series adds a very simple brk-like allocator for very early
allocations. By default it extends the bss segment, starting at _end.

This is used to allocate x86-32's initial head_32.S pagetable, removing
init_pg_table_start/end and pg0, replacing them with brk allocations.

dmi_alloc() is also changed to use extend_brk.


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