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.Memory/MemoryManagementUnix.cs | 75 ++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Ryujinx.Memory/MemoryManagementUnix.cs

(limited to 'Ryujinx.Memory/MemoryManagementUnix.cs')

diff --git a/Ryujinx.Memory/MemoryManagementUnix.cs b/Ryujinx.Memory/MemoryManagementUnix.cs
new file mode 100644
index 00000000..81096867
--- /dev/null
+++ b/Ryujinx.Memory/MemoryManagementUnix.cs
@@ -0,0 +1,75 @@
+using Mono.Unix.Native;
+using System;
+using System.Collections.Concurrent;
+
+namespace Ryujinx.Memory
+{
+    static class MemoryManagementUnix
+    {
+        private static readonly ConcurrentDictionary<IntPtr, ulong> _allocations = new ConcurrentDictionary<IntPtr, ulong>();
+
+        public static IntPtr Allocate(ulong size)
+        {
+            return AllocateInternal(size, MmapProts.PROT_READ | MmapProts.PROT_WRITE);
+        }
+
+        public static IntPtr Reserve(ulong size)
+        {
+            return AllocateInternal(size, MmapProts.PROT_NONE);
+        }
+
+        private static IntPtr AllocateInternal(ulong size, MmapProts prot)
+        {
+            const MmapFlags flags = MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS;
+
+            IntPtr ptr = Syscall.mmap(IntPtr.Zero, size, prot, flags, -1, 0);
+
+            if (ptr == new IntPtr(-1L))
+            {
+                throw new OutOfMemoryException();
+            }
+
+            if (!_allocations.TryAdd(ptr, size))
+            {
+                // This should be impossible, kernel shouldn't return an already mapped address.
+                throw new InvalidOperationException();
+            }
+
+            return ptr;
+        }
+
+        public static bool Commit(IntPtr address, ulong size)
+        {
+            return Syscall.mprotect(address, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE) == 0;
+        }
+
+        public static bool Reprotect(IntPtr address, ulong size, MemoryPermission permission)
+        {
+            return Syscall.mprotect(address, size, GetProtection(permission)) == 0;
+        }
+
+        private static MmapProts GetProtection(MemoryPermission permission)
+        {
+            return permission switch
+            {
+                MemoryPermission.None => MmapProts.PROT_NONE,
+                MemoryPermission.Read => MmapProts.PROT_READ,
+                MemoryPermission.ReadAndWrite => MmapProts.PROT_READ | MmapProts.PROT_WRITE,
+                MemoryPermission.ReadAndExecute => MmapProts.PROT_READ | MmapProts.PROT_EXEC,
+                MemoryPermission.ReadWriteExecute => MmapProts.PROT_READ | MmapProts.PROT_WRITE | MmapProts.PROT_EXEC,
+                MemoryPermission.Execute => MmapProts.PROT_EXEC,
+                _ => throw new MemoryProtectionException(permission)
+            };
+        }
+
+        public static bool Free(IntPtr address)
+        {
+            if (_allocations.TryRemove(address, out ulong size))
+            {
+                return Syscall.munmap(address, size) == 0;
+            }
+
+            return false;
+        }
+    }
+}
\ No newline at end of file
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