gdt: remove anything left from C implementation of GDT

src/isr.c

@@ -3,6 +3,8 @@
 #include "../include/types.h"
 #include "../include/screen.h"
 
+void isr_custom();
+
 void isr_install() {
     idt_set_descriptor(0, (uint32)isr0, 0x8E);
     idt_set_descriptor(1, (uint32)isr1, 0x8E);
@@ -36,11 +38,18 @@ void isr_install() {
     idt_set_descriptor(29, (uint32)isr29, 0x8E);
     idt_set_descriptor(30, (uint32)isr30, 0x8E);
     idt_set_descriptor(31, (uint32)isr31, 0x8E);
+    idt_set_descriptor(0x21, (uint32)isr_custom, 0x8E);
 
     idt_set(); // Load with ASM
     terminal_writestring("isr_install done\n");
 }
 
+void isr_custom()
+{
+	terminal_writestring("YOOOOO!!!!!! I LOVE KATYA!!!!");
+	asm("hlt");
+}
+
 void isr0()
 {
     terminal_writestring(exception_messages[0]);