#include "gdt.h"

gdt_entry gdt[] = {
	gdt_entry_init(0, 0, 0),
	gdt_entry_init(0, 0xfffff, 0xc09a), // Code segment.
	gdt_entry_init(0, 0xfffff, 0xc092), // Data segment.
	gdt_entry_init(0, 0xfffff, 0xc0fa), // User mode code segment.
	gdt_entry_init(0, 0xfffff, 0xc0f2), // User mode data segment.
};

gdt_ptr gdtr = {
	.base = gdt,
	.limit = sizeof(gdt) - 1
};

void gdt_init() {
	asm volatile(
		"lgdt (%0)\n"
		"mov %w1, %%ds\n"
		"mov %w1, %%es\n"
		"mov %w1, %%fs\n"
		"mov %w1, %%gs\n"
		"mov %w1, %%ss\n"
		"ljmp $0x08, $.flush\n"
		".flush:\n"
		: : "r" (&gdtr), "r" (0x10)
	);
}