From c89a91449e1d430e4fd6348772735495687698e4 Mon Sep 17 00:00:00 2001
From: Nabile Rahmani <nabile13.pc@gmail.com>
Date: Fri, 21 Dec 2018 23:32:17 +0100
Subject: [PATCH] Set the MI version register to RCP v2.0.

---
 DotN64/DotN64.csproj                          |  1 +
 ...processor.MIPSInterface.VersionRegister.cs | 76 +++++++++++++++++++
 .../MI/RealityCoprocessor.MIPSInterface.cs    |  4 +-
 3 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.VersionRegister.cs

diff --git a/DotN64/DotN64.csproj b/DotN64/DotN64.csproj
index 40b27f4..7add4e2 100644
--- a/DotN64/DotN64.csproj
+++ b/DotN64/DotN64.csproj
@@ -105,6 +105,7 @@
     <Compile Include="Switch.cs" />
     <Compile Include="RCP\DP\RealityCoprocessor.DisplayProcessor.Angrylion.cs" />
     <Compile Include="RCP\MI\RealityCoprocessor.MIPSInterface.InterruptPins.cs" />
+    <Compile Include="RCP\MI\RealityCoprocessor.MIPSInterface.VersionRegister.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="CPU\" />
diff --git a/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.VersionRegister.cs b/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.VersionRegister.cs
new file mode 100644
index 0000000..023131f
--- /dev/null
+++ b/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.VersionRegister.cs
@@ -0,0 +1,76 @@
+using System.Collections.Specialized;
+
+namespace DotN64.RCP
+{
+    public partial class RealityCoprocessor
+    {
+        public partial class MIPSInterface
+        {
+            public struct VersionRegister
+            {
+                #region Fields
+                private BitVector32 bits;
+
+                private static readonly BitVector32.Section io = BitVector32.CreateSection((1 << 8) - 1),
+                                                            rac = BitVector32.CreateSection((1 << 8) - 1, io),
+                                                            rdp = BitVector32.CreateSection((1 << 8) - 1, rac),
+                                                            rsp = BitVector32.CreateSection((1 << 8) - 1, rdp);
+                #endregion
+
+                #region Properties
+                public byte IO
+                {
+                    get => (byte)bits[io];
+                    set => bits[io] = value;
+                }
+
+                public byte RAC
+                {
+                    get => (byte)bits[rac];
+                    set => bits[rac] = value;
+                }
+
+                public byte RDP
+                {
+                    get => (byte)bits[rdp];
+                    set => bits[rdp] = value;
+                }
+
+                public byte RSP
+                {
+                    get => (byte)bits[rsp];
+                    set => bits[rsp] = value;
+                }
+
+                /// <summary>
+                /// The prototype RCP chip.
+                /// </summary>
+                public static VersionRegister Version1 => new VersionRegister
+                {
+                    IO = 1,
+                    RAC = 1,
+                    RDP = 1,
+                    RSP = 1
+                };
+
+                /// <summary>
+                /// The retail RCP chip.
+                /// </summary>
+                public static VersionRegister Version2 => new VersionRegister
+                {
+                    IO = 2,
+                    RAC = 1,
+                    RDP = 2,
+                    RSP = 2
+                };
+                #endregion
+
+                #region Operators
+                public static implicit operator VersionRegister(uint data) => new VersionRegister { bits = new BitVector32((int)data) };
+
+                public static implicit operator uint(VersionRegister version) => (uint)version.bits.Data;
+                #endregion
+            }
+        }
+    }
+}
diff --git a/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.cs b/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.cs
index 04625a3..20d82c2 100644
--- a/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.cs
+++ b/DotN64/RCP/MI/RealityCoprocessor.MIPSInterface.cs
@@ -13,6 +13,8 @@ namespace DotN64.RCP
 
             public InitModeRegister InitMode { get; set; }
 
+            public VersionRegister Version { get; set; } = VersionRegister.Version2;
+
             public Interrupts InterruptMask { get; set; }
 
             private Interrupts interrupt;
@@ -60,7 +62,7 @@ namespace DotN64.RCP
                     },
                     new MappingEntry(0x04300004, 0x04300007) // MI version.
                     {
-                        Read = o => 0 // TODO.
+                        Read = o => Version
                     },
                     new MappingEntry(0x04300008, 0x0430000B) // MI interrupt.
                     {