Another one of those larger endeavours that take
multiple commits. This first one introduces the
basic vm_page data structure, as well as the x86
bootstrap code for initializing it.
This is a huge commit, but it mainly just moves
some files around and doesn't change their
contents much.
A lot of stuff works the same on amd64 as it does
on i386, so i'm moving the parts that are specific
to the latter into separate subdirectories while
the rest can be shared with the amd64 codebase.
This commit also fixes the fun little size bug in
segment.S where i subtracted the end from the
start address of the GDT instead of the other way
round which resulted in a gigantic overflow :)
Now that memory allocation finally kind of works,
we can finally start focusing on the core system
architecture. This commit also fixes some bugs in
get_page() and friends, as well as performance
improvements because the page map is addressed as
unsigned longs rather than individual bytes.
anna