Add toolchain script for x86
First x86-multiboot commit
Use i586 (Pentium) instead of i486 toolchain
Implement getcontext and setcontext
Interrupt handling should be working, now
Less magic numbers for UART
Implement PIC
'Implement' GDT and PIT, fix PIC
Add page table (no #PF handler, yet)
Dump
Page fault handler works now
Fix inISR() tracking
Add FPU support
Implement RTC
Fix thread_yield() bug (didn't restore EFLAGS.IF)
Newlib mallocs pages before x86_init_memory gets called
Implement PCI (listing only)
Move more logic out of board, into cpu
Must not disable inISR if the context should be switched
Implement m(un)map