old-MTGos-old/kernel/hal/x86/init/gdt.cpp

#include <base.hpp>
#include <gdt.hpp>
#include <serial.hpp>
namespace MTGosHAL {
	GDT::GDT() {
		gdt[0]=gdt[1]=gdt[2]=gdt[3]=gdt[4]=gdt[5]=gdt[6]=0x0ull;
	}
	auto GDT::setEntry(int i, unsigned int base, unsigned int limit, int flags) -> void {
		gdt[i] = limit & 0xffffLL;
		gdt[i] |= (base & 0xffffffLL) << 16;
		gdt[i] |= (flags & 0xffLL) << 40;
		gdt[i] |= ((limit >> 16) & 0xfLL) << 48;
		gdt[i] |= ((flags >> 8 )& 0xffLL) << 52;
		gdt[i] |= ((base >> 24) & 0xffLL) << 56;
	}
	auto GDT::apply() -> void {
		debug << "We are now trying to set our GDT. If the CPU triplefaults, something went wrong in MTGosHAL::GDT::apply() or loadGDT().\n";
		fin={(uint16_t)7*8-1, (void*)gdt};
		loadGDT((void*)(&fin));
	};
}