finished initial interrupts implementation

common/src/instructions.rs

@@ -10,7 +10,9 @@ pub enum Interrupt {
 pub type Address = u32;
 
 impl Interrupt {
-    const fn as_u8(self) -> u8 {
+    // someone tell clippy to stfu.
+    #[allow(clippy::must_use_candidate)]
+    pub const fn as_u8(self) -> u8 {
         match self {
             Self::Breakpoint => 0,
             Self::HardFault => 1,

common/src/instructions/encode.rs

@@ -54,12 +54,14 @@ impl Encode for Instruction {
             ],
             no_args: [Nop, IntReturn, Halt],
             special: [
-                Self::Interrupt(_) => todo!(),
                 Self::Data(data) => data,
+                Self::Interrupt(interrupt) => {
+                    let opcode = u32::from(self.opcode());
+                    (opcode << 26) | u32::from(interrupt.as_u8())
+                },
                 Self::Segment(segment) => {
                     let opcode = u32::from(self.opcode());
-                    let segment = segment as u8;
-                    (opcode << 26) | u32::from(segment)
+                    (opcode << 26) | u32::from(segment as u8)
                 }
             ]
         )