feat: Add SysCalls

src/MimaSim/MimaSim/Controls/MimaComponents/Wrappers/ControlUnitWrapper.axaml

@@ -10,15 +10,16 @@
              x:Class="MimaSim.Controls.MimaComponents.Wrappers.ControlUnitWrapper">
   <Canvas>
      <c:RegisterControl Register="FLAG" Width="45" Canvas.Left="100" Canvas.Top="15" me:RegisterConnector.IsConnected="True" />
+     <c:RegisterControl Register="SCR" Width="45" Canvas.Left="100" Canvas.Top="45" me:RegisterConnector.IsConnected="True" />
 
-      <c:ControlUnitControl Canvas.Top="0" Canvas.Left="0" Width="100" Height="220" />
+     <c:ControlUnitControl Canvas.Top="0" Canvas.Left="0" Width="100" Height="220" />
 
-    <c:ClockControl Name="clock" Tag="{me:GetClockFrequency}" Canvas.Top="5" Canvas.Left="5" Width="35" Height="35" ToolTip.Tip="{Binding ElementName=clock, Path=Tag}" />
+     <c:ClockControl Name="clock" Tag="{me:GetClockFrequency}" Canvas.Top="5" Canvas.Left="5" Width="35" Height="35" ToolTip.Tip="{Binding ElementName=clock, Path=Tag}" />
 
-    <c:BusControl b:BusRegistry.Id="controlunit_iar" Canvas.Left="15" Canvas.Top="220" Width="15" Height="25" State="None" />
-    <c:RegisterControl Register="IAR" Canvas.Left="5" Canvas.Top="245" me:RegisterConnector.IsConnected="True" />
+     <c:BusControl b:BusRegistry.Id="controlunit_iar" Canvas.Left="15" Canvas.Top="220" Width="15" Height="25" State="None" />
+     <c:RegisterControl Register="IAR" Canvas.Left="5" Canvas.Top="245" me:RegisterConnector.IsConnected="True" />
 
-    <c:BusControl b:BusRegistry.Id="controlunit_sp" Canvas.Left="65" Canvas.Top="220" Width="15" Height="25" State="None" />
-    <c:RegisterControl Register="SP" Canvas.Left="55" Canvas.Top="245" me:RegisterConnector.IsConnected="True" />
+     <c:BusControl b:BusRegistry.Id="controlunit_sp" Canvas.Left="65" Canvas.Top="220" Width="15" Height="25" State="None" />
+     <c:RegisterControl Register="SP" Canvas.Left="55" Canvas.Top="245" me:RegisterConnector.IsConnected="True" />
   </Canvas>
 </UserControl>

src/MimaSim/MimaSim/MIMA/Components/ControlUnit.cs

@@ -1,11 +1,29 @@
-namespace MimaSim.MIMA.Components;
+using System;
+using System.Collections.Generic;
+
+namespace MimaSim.MIMA.Components;
 
 public class ControlUnit
 {
     public Bus AccuBus = new();
     public Register FLAG = new("FLAG");
     public Register IAR = new("IAR");
     public Register SP = new("SP", 49);
+    public Register SCR = new("SCR");
+
+    private Dictionary<SysCall, Action> _syscalls = new();
+
+    public void AddSysCall(SysCall syscall, Action action)
+    {
+        _syscalls.TryAdd(syscall, action);
+    }
+
+    public void InvokeSysCall(SysCall syscall)
+    {
+        _syscalls.TryGetValue(syscall, out Action? action);
+
+        action!();
+    }
 
     public bool HasFlag(Flags flag)
     {

src/MimaSim/MimaSim/MIMA/Instructions/SysCallInstruction.cs

@@ -0,0 +1,22 @@
+using System.Text;
+using MimaSim.Core;
+using MimaSim.MIMA.Components;
+
+namespace MimaSim.MIMA.Instructions;
+
+public class SysCallInstruction : IInstruction, IDisassemblyInstruction
+{
+    public OpCodes OpCode => OpCodes.SYSCALL;
+
+    public bool Invoke(CPU cpu)
+    {
+       cpu.ControlUnit.InvokeSysCall((SysCall)cpu.Fetch16());
+
+        return true;
+    }
+
+    public void Dissassemble(StringBuilder builder, Disassembler disassembler)
+    {
+        builder.AppendLine($"syscall 0x{disassembler.Fetch16():X2}");
+    }
+}

src/MimaSim/MimaSim/MIMA/Mnemnonics.cs

@@ -18,5 +18,6 @@ public enum Mnemnonics
     CLK,
     FLAG,
     UNFLAG,
-    HASFLAG
+    HASFLAG,
+    SYSCALL
 }

src/MimaSim/MimaSim/MIMA/OpCodes.cs

@@ -20,7 +20,6 @@ public enum OpCodes
 
     //Shifting
     LSHIFT = 0x20,
-
     RSHIFT = 0x21,
 
     // Logical
@@ -53,5 +52,7 @@ public enum OpCodes
 
     FLAG = 0x46,
     HASFLAG = 0x47,
-    UNFLAG = 0x48
+    UNFLAG = 0x48,
+
+    SYSCALL = 0x49,
 }

src/MimaSim/MimaSim/MIMA/Parsing/Parsers/Assembler/AssemblyVisitor.cs

@@ -43,6 +43,11 @@ public AssemblyVisitor()
         {
             Scope.Root.Define(flag.ToUpper(), (short)Enum.Parse<Flags>(flag));
         }
+
+        foreach (var syscall in Enum.GetNames<SysCall>())
+        {
+            Scope.Root.Define(syscall.ToUpper(), (short)Enum.Parse<SysCall>(syscall));
+        }
     }
 
     private void VisitMacroInvocation(InstructionNode invocation, Scope scope)
@@ -187,27 +192,12 @@ public void Visit(InstructionNode instruction, Scope scope)
 
     private OpCodes SelectOpCode(InstructionNode instruction, Scope scope, Mnemnonics mnemnonic)
     {
-        return mnemnonic switch
-        {
-            Mnemnonics.MOV => SelectMovOpCode(instruction, scope),
-            Mnemnonics.LOAD => OpCodes.LOAD,
-            Mnemnonics.JMP => OpCodes.JMP,
-            Mnemnonics.JMPC => OpCodes.JMPC,
-            Mnemnonics.CMPNE => OpCodes.CMPNEQ,
-            Mnemnonics.CMPE => OpCodes.CMPEQ,
-            Mnemnonics.CMPLT => OpCodes.CMPLT,
-            Mnemnonics.CMPGT => OpCodes.CMPGT,
-            Mnemnonics.ADD => OpCodes.ADD,
-            Mnemnonics.SUB => OpCodes.SUB,
-            Mnemnonics.PUSH => OpCodes.PUSH,
-            Mnemnonics.POP => OpCodes.POP,
-            Mnemnonics.EXIT => OpCodes.EXIT,
-            Mnemnonics.CLK => OpCodes.CLK,
-            Mnemnonics.FLAG => OpCodes.FLAG,
-            Mnemnonics.HASFLAG => OpCodes.HASFLAG,
-            Mnemnonics.UNFLAG => OpCodes.UNFLAG,
-            _ => throw new ArgumentOutOfRangeException(nameof(instruction.Mnemnonic), $@"No opcode defined for mnemonic: {instruction.Mnemnonic}")
-        };
+        if (mnemnonic == Mnemnonics.MOV)
+        {
+            return SelectMovOpCode(instruction, scope);
+        }
+
+        return Enum.Parse<OpCodes>(mnemnonic.ToString());
     }
 
     private OpCodes SelectMovOpCode(InstructionNode instruction, Scope scope)

src/MimaSim/MimaSim/MIMA/Registers.cs

@@ -14,4 +14,5 @@ public enum Registers
     DX,
     DY,
     FLAG,
+    SCR // Register to store syscall result
 }

src/MimaSim/MimaSim/MIMA/SysCall.cs

@@ -0,0 +1,6 @@
+namespace MimaSim.MIMA;
+
+public enum SysCall
+{
+
+}

src/MimaSim/MimaSim/Resources/Highligting/Assembler.xshd

@@ -54,6 +54,8 @@
 			<Word>unflag</Word>
 			<Word>hasflag</Word>
 
+			<Word>syscall</Word>
+
 			<Word>macro</Word>
 		</Keywords>