Add toolchain script for x86
Add quadword math lib

GCC implicitly calls functions like __adddi3 to handle arithmetics on
long long.

Copied from http://ftp3.usa.openbsd.org/pub/OpenBSD/src/lib/libc/quad/
which is curtesy of the OpenBSD project (3 clause BSD license).
[BLEEDING EDGES] first x86-multiboot commit
Dump
Implement getcontext and setcontext
Implement makecontext, hello-world works now!
Interrupt handling should be working, now
Don't put NOPs into the elf needlessly
Build newlib with -flto
Less magic numbers for UART
Implement PIC
'Implement' GDT and PIT, fix PIC
Add page table (no #PF handler, yet)
Better assembly for ucontext
Dump
Page fault handler works now
Fix inISR() tracking