Added GDT, finished IDT, at the sole price of my soul :)

build.zig

@@ -11,7 +11,7 @@ pub fn build(b: *std.Build) void
             .os_tag = .freestanding,
         }),
         .optimize = .Debug,
-        .strip = true,
+        // .strip = true,
         .code_model = .kernel,
         .pic = false,
         .error_tracing = false,

sources/kernel/interrupts/gdt.zig

@@ -1,4 +1,63 @@
-const GDT_Table = {
-	var null_descriptor : u8,
-
-};
+
+const GDT_Entry = packed struct {
+	limit : u16,
+	base_low : u16,
+	base_middle : u8,
+	access : u8,
+	flags : u8,
+	base_high : u8
+};
+
+const GDT_Pointer = packed struct {
+	limit : u16,
+	base : *GDT_Entry
+};
+
+var GDTEntry : [5]GDT_Entry = undefined;
+
+var GDTPointer : GDT_Pointer = undefined;
+
+comptime {
+	asm (
+		\\.type GDT_Flush, @function
+		\\ GDT_Flush:
+		\\ mov +4(%esp), %eax
+		\\ lgdt (%eax)
+		\\ mov $0x10, %ax
+		\\ mov %ax, %ds
+		\\ mov %ax, %es
+		\\ mov %ax, %fs
+		\\ mov %ax, %gs
+		\\ mov %ax, %ss
+		\\ ljmp $0x08, $1f
+		\\ 1: ret
+	);
+}
+
+extern fn GDT_Flush(*const GDT_Pointer) void;
+
+pub fn GDT_Init() void
+{
+
+	GDTPointer.limit = @sizeOf(GDT_Entry) * 5 - 1;
+	GDTPointer.base = &GDTEntry[0];
+
+	GDT_setGate(0,0,0,0,0);
+	GDT_setGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
+	GDT_setGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
+	GDT_setGate(3, 0, 0xFFFFFFFF, 0xFA, 0xCF);
+	GDT_setGate(4, 0, 0xFFFFFFFF, 0xF2, 0xCF);
+
+	GDT_Flush(&GDTPointer);
+}
+
+pub fn GDT_setGate(num : u32, base : u32, limit : u32, access : u8, flags : u8) void
+{
+	GDTEntry[num].base_low = @truncate(base);
+	GDTEntry[num].base_middle = @truncate(base >> 16);
+	GDTEntry[num].base_high = @truncate(base >> 24);
+	GDTEntry[num].limit = @truncate(limit);
+	GDTEntry[num].flags = @truncate(limit >> 16);
+	GDTEntry[num].flags |= (flags & 0xF0);
+	GDTEntry[num].access = access;
+}