From f77694e4f774c9391aad5344e70a7c8721cfedc6 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Sun, 3 May 2020 19:54:50 -0300
Subject: Implement a new physical memory manager and replace DeviceMemory
 (#856)

* Implement a new physical memory manager and replace DeviceMemory

* Proper generic constraints

* Fix debug build

* Add memory tests

* New CPU memory manager and general code cleanup

* Remove host memory management from CPU project, use Ryujinx.Memory instead

* Fix tests

* Document exceptions on MemoryBlock

* Fix leak on unix memory allocation

* Proper disposal of some objects on tests

* Fix JitCache not being set as initialized

* GetRef without checks for 8-bits and 16-bits CAS

* Add MemoryBlock destructor

* Throw in separate method to improve codegen

* Address PR feedback

* QueryModified improvements

* Fix memory write tracking not marking all pages as modified in some cases

* Simplify MarkRegionAsModified

* Remove XML doc for ghost param

* Add back optimization to avoid useless buffer updates

* Add Ryujinx.Cpu project, move MemoryManager there and remove MemoryBlockWrapper

* Some nits

* Do not perform address translation when size is 0

* Address PR feedback and format NativeInterface class

* Remove ghost parameter description

* Update Ryujinx.Cpu to .NET Core 3.1

* Address PR feedback

* Fix build

* Return a well defined value for GetPhysicalAddress with invalid VA, and do not return unmapped ranges as modified

* Typo
---
 Ryujinx.Cpu/MemoryHelper.cs | 73 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Ryujinx.Cpu/MemoryHelper.cs

(limited to 'Ryujinx.Cpu/MemoryHelper.cs')

diff --git a/Ryujinx.Cpu/MemoryHelper.cs b/Ryujinx.Cpu/MemoryHelper.cs
new file mode 100644
index 00000000..5ba5ef38
--- /dev/null
+++ b/Ryujinx.Cpu/MemoryHelper.cs
@@ -0,0 +1,73 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Ryujinx.Cpu
+{
+    public static class MemoryHelper
+    {
+        public static void FillWithZeros(MemoryManager memory, long position, int size)
+        {
+            int size8 = size & ~(8 - 1);
+
+            for (int offs = 0; offs < size8; offs += 8)
+            {
+                memory.Write<long>((ulong)(position + offs), 0);
+            }
+
+            for (int offs = size8; offs < (size - size8); offs++)
+            {
+                memory.Write<byte>((ulong)(position + offs), 0);
+            }
+        }
+
+        public unsafe static T Read<T>(MemoryManager memory, long position) where T : struct
+        {
+            long size = Marshal.SizeOf<T>();
+
+            byte[] data = new byte[size];
+
+            memory.Read((ulong)position, data);
+
+            fixed (byte* ptr = data)
+            {
+                return Marshal.PtrToStructure<T>((IntPtr)ptr);
+            }
+        }
+
+        public unsafe static void Write<T>(MemoryManager memory, long position, T value) where T : struct
+        {
+            long size = Marshal.SizeOf<T>();
+
+            byte[] data = new byte[size];
+
+            fixed (byte* ptr = data)
+            {
+                Marshal.StructureToPtr<T>(value, (IntPtr)ptr, false);
+            }
+
+            memory.Write((ulong)position, data);
+        }
+
+        public static string ReadAsciiString(MemoryManager memory, long position, long maxSize = -1)
+        {
+            using (MemoryStream ms = new MemoryStream())
+            {
+                for (long offs = 0; offs < maxSize || maxSize == -1; offs++)
+                {
+                    byte value = memory.Read<byte>((ulong)(position + offs));
+
+                    if (value == 0)
+                    {
+                        break;
+                    }
+
+                    ms.WriteByte(value);
+                }
+
+                return Encoding.ASCII.GetString(ms.ToArray());
+            }
+        }
+    }
+}
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