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use 8MiB reserved array to manage up to 4GiB of physical memory
(4K Pages only)
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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well, it's not trivial to use bios function because thanks to grub +
multiboot, we are already in protected mode when the startup code takes
control. Also the MB info is easier to play with than BIOS (or ACPI)
Signed-off-by: Tianhao Wang <shrik3@mailbox.org>
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1. throw vectors in a custom ".reserved" section
2. throw idt in a NOLOAD ".reserved_0" section: save some binary size
(like .bss) since we don't care for its initial value.
3. squash all ".data.*" sections from rust into ".data"
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the name `compiler` is ambiguous
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