ft(interpreter): impl far jumps with correct CS addressing

src/interpreter/register.rs

@@ -162,3 +162,32 @@ gen_regs!(AX);
 gen_regs!(BX);
 gen_regs!(CX);
 gen_regs!(DX);
+
+#[derive(Debug, Clone, Copy)]
+pub struct SegmentRegister {
+    pub ds: Word,
+    pub es: Word,
+    pub ss: Word,
+    pub cs: Word,
+}
+
+impl SegmentRegister {
+    pub fn new() -> Self {
+        Self {
+            ds: 0,
+            es: 0,
+            ss: 0,
+            cs: 0,
+        }
+    }
+}
+
+impl fmt::Display for SegmentRegister {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "DS({}) ES({}) SS({}) CS({})",
+            self.ds, self.es, self.ss, self.cs
+        )
+    }
+}