initial commit

Signed-off-by: Sean Cross <sean@xobs.io>

fb.cs

@@ -0,0 +1,94 @@
+//
+// Copyright (c) 2010 - 2019 Antmicro
+//
+// This file is licensed under the MIT License.
+// Full license text is available in 'licenses/MIT.txt'.
+//
+
+using System;
+using System.Linq;
+using Antmicro.Renode.Backends.Display;
+using Antmicro.Renode.Core;
+using Antmicro.Renode.Core.Structure.Registers;
+using Antmicro.Renode.Logging;
+using Antmicro.Renode.Peripherals.Bus;
+using Antmicro.Renode.Peripherals.Memory;
+using Antmicro.Renode.Utilities;
+
+namespace Antmicro.Renode.Peripherals.Video
+{
+    public class fb : AutoRepaintingVideo, IDoubleWordPeripheral, IProvidesRegisterCollection<DoubleWordRegisterCollection>, IKnownSize
+    {
+        public fb(Machine machine) : base(machine)
+        {
+            this.machine = machine;
+
+            RegistersCollection = new DoubleWordRegisterCollection(this);
+            Reconfigure(336, 536, PixelFormat.RGB565, false);
+	    for (int i = 0; i < buffer.Length; i++) buffer[i] = 0;
+	    DoRepaint();
+	    DefineRegisters();
+	    Reset();
+        }
+
+        public void WriteDoubleWord(long address, uint value)
+        {
+            RegistersCollection.Write(address, value);
+        }
+
+        public uint ReadDoubleWord(long offset)
+        {
+            return RegistersCollection.Read(offset);
+        }
+
+        public override void Reset()
+        {
+            RegistersCollection.Reset();
+        }
+
+        public long Size => 0x800;
+        public DoubleWordRegisterCollection RegistersCollection { get; private set; }
+
+        protected override void Repaint()
+        {
+	    var newbuf = new Byte[44*Height];
+            machine.SystemBus.ReadBytes(bufferAddress, newbuf.Length, newbuf, 0);
+	    for (int y = 0; y < Height; y++) {
+		    if (!updateDirty || updateAll || ((newbuf[y*44+0x2a] & 0x1) == 0x1)) for (int x = 0; x < Width; x++) {
+			if (((newbuf[((x+y*44*8))/8] >> (x%8))&1) > 0) {
+				buffer[2*(x+y*Width)] = 0xFF;
+				buffer[2*(x+y*Width)+1] = 0xFF;
+			} else {
+				buffer[2*(x+y*Width)] = 0x0;
+				buffer[2*(x+y*Width)+1] = 0x0;
+			}
+		    }
+	    }
+        }
+
+        private void DefineRegisters()
+        {
+            Registers.COMMAND.Define(this)
+                .WithValueField(0, 32, writeCallback: (_, val) =>
+                {
+		    updateDirty = (val & 0x1) == 0x1;
+		    updateAll = (val & 0x10) == 0x10;
+		    DoRepaint();
+                })
+            ;
+        }
+
+	private bool updateDirty = false;
+	private bool updateAll = false;
+
+        private uint bufferAddress = 0xB0000000;
+
+        private readonly Machine machine;
+
+        private enum Registers
+        {
+            COMMAND = 0x0,
+	    BUSY = 0x04
+        }
+    }
+}

test.repl

@@ -0,0 +1,17 @@
+cpu: CPU.VexRiscv @ sysbus
+    cpuType: "rv32gc"
+
+mem: Memory.MappedMemory @ sysbus 0x20500000
+    size: 0x10000
+
+mem2: Memory.MappedMemory @ sysbus 0x00001000
+    size: 0x40000
+
+mem3: Memory.MappedMemory @ sysbus 0x40000000
+    size: 0x10000000
+
+fbmem: Memory.MappedMemory @ sysbus 0xB0000000
+    size: 0x6000
+
+fb: Video.fb @ sysbus 0xF0005000
+

test.resc

@@ -0,0 +1,7 @@
+mach create
+i @fb.cs
+using sysbus
+machine LoadPlatformDescription "test.repl"
+sysbus ApplySVD @soc.svd
+sysbus LoadELF @betrusted-soc
+showAnalyzer sysbus.fb