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

1 files changed, 106 insertions, 0 deletions

diff --git a/Ryujinx.Memory/MemoryManagementWindows.cs b/Ryujinx.Memory/MemoryManagementWindows.cs
new file mode 100644
index 00000000..9513bb54
--- /dev/null
+++ b/Ryujinx.Memory/MemoryManagementWindows.cs
@@ -0,0 +1,106 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Memory
+{
+    static class MemoryManagementWindows
+    {
+        [Flags]
+        private enum AllocationType : uint
+        {
+            Commit = 0x1000,
+            Reserve = 0x2000,
+            Decommit = 0x4000,
+            Release = 0x8000,
+            Reset = 0x80000,
+            Physical = 0x400000,
+            TopDown = 0x100000,
+            WriteWatch = 0x200000,
+            LargePages = 0x20000000
+        }
+
+        [Flags]
+        private enum MemoryProtection : uint
+        {
+            NoAccess = 0x01,
+            ReadOnly = 0x02,
+            ReadWrite = 0x04,
+            WriteCopy = 0x08,
+            Execute = 0x10,
+            ExecuteRead = 0x20,
+            ExecuteReadWrite = 0x40,
+            ExecuteWriteCopy = 0x80,
+            GuardModifierflag = 0x100,
+            NoCacheModifierflag = 0x200,
+            WriteCombineModifierflag = 0x400
+        }
+
+        [DllImport("kernel32.dll")]
+        private static extern IntPtr VirtualAlloc(
+            IntPtr lpAddress,
+            IntPtr dwSize,
+            AllocationType flAllocationType,
+            MemoryProtection flProtect);
+
+        [DllImport("kernel32.dll")]
+        private static extern bool VirtualProtect(
+            IntPtr lpAddress,
+            IntPtr dwSize,
+            MemoryProtection flNewProtect,
+            out MemoryProtection lpflOldProtect);
+
+        [DllImport("kernel32.dll")]
+        private static extern bool VirtualFree(IntPtr lpAddress, IntPtr dwSize, AllocationType dwFreeType);
+
+        public static IntPtr Allocate(IntPtr size)
+        {
+            return AllocateInternal(size, AllocationType.Reserve | AllocationType.Commit);
+        }
+
+        public static IntPtr Reserve(IntPtr size)
+        {
+            return AllocateInternal(size, AllocationType.Reserve);
+        }
+
+        private static IntPtr AllocateInternal(IntPtr size, AllocationType flags = 0)
+        {
+            IntPtr ptr = VirtualAlloc(IntPtr.Zero, size, flags, MemoryProtection.ReadWrite);
+
+            if (ptr == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return ptr;
+        }
+
+        public static bool Commit(IntPtr location, IntPtr size)
+        {
+            return VirtualAlloc(location, size, AllocationType.Commit, MemoryProtection.ReadWrite) != IntPtr.Zero;
+        }
+
+        public static bool Reprotect(IntPtr address, IntPtr size, MemoryPermission permission)
+        {
+            return VirtualProtect(address, size, GetProtection(permission), out _);
+        }
+
+        private static MemoryProtection GetProtection(MemoryPermission permission)
+        {
+            return permission switch
+            {
+                MemoryPermission.None => MemoryProtection.NoAccess,
+                MemoryPermission.Read => MemoryProtection.ReadOnly,
+                MemoryPermission.ReadAndWrite => MemoryProtection.ReadWrite,
+                MemoryPermission.ReadAndExecute => MemoryProtection.ExecuteRead,
+                MemoryPermission.ReadWriteExecute => MemoryProtection.ExecuteReadWrite,
+                MemoryPermission.Execute => MemoryProtection.Execute,
+                _ => throw new MemoryProtectionException(permission)
+            };
+        }
+
+        public static bool Free(IntPtr address)
+        {
+            return VirtualFree(address, IntPtr.Zero, AllocationType.Release);
+        }
+    }
+}
\ No newline at end of file