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adapting the multiboot structures by setting some values to public
This is the very begining of the PFA, the PFA is in charge of mapping the memory into pages, and keep track of free pages. To archieve this it uses an internal bitmap, set to 1 if a page is in use or reserved, to 0 if the page is free.
The page frame allocator does now mark as "reserved" (set bit to 1 on bitmap) The reserved pages include grub marked as reserved and the kernel in memory and finally the bitmap itself.
Changes how the bitmap reserving works. Because GRUB does not give us the whole memory we have to mark usable memory only with hose that grub excplicitly marks as usable. And we have to keep the lower memory reserved.
Since the mod is already named pageframe, allocator is enough to be called pageframe::Allocator
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the page frame allocator allocates blocs of physical memory that are size of a Page (4096 bytes).