Make ATAPI a tiny bit faster

Tests/Kernels/Cosmos.Kernel.Tests.IO/Kernel.cs

@@ -2,12 +2,17 @@
 using Sys = Cosmos.System;
 using System;
 using Cosmos.Kernel.Tests.IO.System.IO;
+using System.IO;
+using Cosmos.HAL;
+using Cosmos.System.FileSystem;
+using XSharp.x86.Params;
+using System.Collections.Generic;
 
 namespace Cosmos.Kernel.Tests.IO
 {
     public class Kernel : Sys.Kernel
     {
-        private bool ExecuteFileStreamTests = false;
+        private bool ExecuteFileStreamTests = true;
         private Sys.FileSystem.VFS.VFSBase mVFS;
 
         static readonly public byte[] xBytes = new byte[16]
@@ -27,6 +32,62 @@ protected override void BeforeRun()
             }
         }
 
+        private void DumpFolder(string aPath, string indent = "") {
+            var files = Directory.GetFiles(aPath);
+            foreach (var file in files) {
+                mDebugger.Send(indent + "File: " + file);
+            }
+
+            var dirs = Directory.GetDirectories(aPath);
+            foreach (var dir in dirs) {
+                mDebugger.Send(indent + "Dir: " + dir);
+                DumpFolder(aPath + "/" + dir, indent + "  ");
+            }
+        }
+
+        private void TestLargeFileFromATAPI() {
+            // Dump all partitions
+            List<Disk> xDisks = mVFS.GetDisks();
+
+            foreach (var xDisk in xDisks) {
+                foreach (var xPart in xDisk.Partitions) {
+                    mDebugger.Send("Partition: " + xPart.RootPath);
+                    DumpFolder(xPart.RootPath);
+                }
+            }
+
+
+            float secondCounter = 0;
+
+            Global.PIT.T0Frequency = 100;
+            Global.PIT.RegisterTimer(new(() => {
+                secondCounter += 0.1f;
+            }, 100000000 /* 100ms */, true));
+            File.Copy("1:\\boot\\limine\\liminewp.bmp", "0:\\liminewp.bmp", true);
+
+            mDebugger.Send("Took " + secondCounter + " seconds to copy large file from ATAPI to hard drive!");
+
+            // check file identity
+            var xFile1 = File.OpenRead("1:\\boot\\limine\\liminewp.bmp");
+            var xFile2 = File.OpenRead("0:\\liminewp.bmp");
+
+            if (xFile1.Length != xFile2.Length) {
+                mDebugger.Send("File lengths do not match!");
+                TestController.Failed();
+                return;
+            }
+
+            for (int i = 0; i < Math.Min(128, xFile1.Length); i++) {
+                if (xFile1.ReadByte() != xFile2.ReadByte()) {
+                    mDebugger.Send("File contents do not match!");
+                    TestController.Failed();
+                    return;
+                }
+            }
+
+            mDebugger.Send("File contents match!");
+        }
+
         protected override void Run()
         {
             try
@@ -39,11 +100,13 @@ protected override void Run()
                 StringReaderTest.Execute(mDebugger);
                 StringWriterTest.Execute(mDebugger);
 
+                TestLargeFileFromATAPI();
+
                 TestController.Completed();
             }
             catch(Exception e)
             {
-                mDebugger.Send("Exception occurred: " + e.Message);
+                mDebugger.Send(e.GetType().Name + " occurred: " + e.Message);
 
                 TestController.Failed();
             }

source/Cosmos.Core/IOPort.cs

@@ -80,18 +80,16 @@ public static class IOPort
         /// <exception cref="System.OverflowException">Thrown if aData lenght is greater than Int32.MaxValue.</exception>
         [PlugMethod(PlugRequired = true)]
         public static void Read8(int aPort, byte[] aData) => throw null;
-        
+
         /// <summary>
-        /// Read Word from base port.
+        /// Read Words from base port.
         /// </summary>
         /// <param name="aData">Output data array.</param>
         /// <exception cref="System.OverflowException">Thrown if aData lenght is greater than Int32.MaxValue.</exception>
+        [PlugMethod(PlugRequired = true)]
         public static void Read16(int aPort, ushort[] aData)
         {
-            for (int i = 0; i < aData.Length; i++)
-            {
-                aData[i] = Read16(aPort);
-            }
+            throw null;
         }
 
         /// <summary>

source/Cosmos.Core_Asm/IOPortImpl.cs

@@ -164,6 +164,33 @@ public override void AssembleNew(Assembler aAssembler, object aMethodInfo)
 
         #endregion
 
+        #region Read16 (many)
+
+        private class Read16ManyAssembler : AssemblerMethod {
+            public override void AssembleNew(Assembler aAssembler, object aMethodInfo) {
+                // the port index is in EBP+16
+                // the reference to the byte array is in EBP+12
+                XS.Set(XSRegisters.EDX, XSRegisters.EBP, sourceDisplacement: 16); // EDX = Port (ebp+16)
+                XS.Set(XSRegisters.ECX, XSRegisters.EBP, sourceDisplacement: 12); // ECX = Pointer to array (ebp+12)
+
+                XS.Lea(XSRegisters.ESI, XSRegisters.ECX, sourceDisplacement: 16); // ESI = Data* (ecx+16)
+                XS.Set(XSRegisters.EBX, XSRegisters.ECX, sourceDisplacement: 8); // EBX = Length (ecx+8)
+
+                XS.Label(".loop");
+                XS.ReadFromPortDX(XSRegisters.AX);
+                XS.Set(XSRegisters.ESI, XSRegisters.AX, destinationIsIndirect: true); // *esi = ax
+                XS.Add(XSRegisters.ESI, 2); // esi++
+
+                XS.Sub(XSRegisters.EBX, 1); // ebx--
+                XS.Jump(XSharp.Assembler.x86.ConditionalTestEnum.NotZero, ".loop"); // if (ebx != 0) goto .loop
+            }
+        }
+
+        [PlugMethod(Assembler = typeof(Read16ManyAssembler))]
+        public static void Read16(ushort aPort, ushort[] aData) => throw null;
+
+        #endregion
+
         #region Read32
 
         private class Read32Assembler : AssemblerMethod