kernel: Implement SetMemoryPermission syscall (#2772)

* kernel: Implement SetMemoryPermission syscall

This commit implement the SetMemoryPermission syscall accurately.
This also fix KMemoryPermission not being an unsigned 32 bits type and
add the "DontCare" bit (used by shared memory, currently unused in
Ryujinx)

* Update MemoryPermission mask

* Address gdkchan's comments

* Fix a nit

* Address gdkchan's comment

Ryujinx.HLE/HOS/Kernel/Memory/KPageTableBase.cs

@@ -799,6 +799,52 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
             return KernelResult.Success;
         }
 
+        public KernelResult SetMemoryPermission(ulong address, ulong size, KMemoryPermission permission)
+        {
+            lock (_blockManager)
+            {
+                if (CheckRange(
+                    address,
+                    size,
+                    MemoryState.PermissionChangeAllowed,
+                    MemoryState.PermissionChangeAllowed,
+                    KMemoryPermission.None,
+                    KMemoryPermission.None,
+                    MemoryAttribute.Mask,
+                    MemoryAttribute.None,
+                    MemoryAttribute.IpcAndDeviceMapped,
+                    out MemoryState oldState,
+                    out KMemoryPermission oldPermission,
+                    out _))
+                {
+                    if (permission != oldPermission)
+                    {
+                        if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
+                        {
+                            return KernelResult.OutOfResource;
+                        }
+
+                        ulong pagesCount = size / PageSize;
+
+                        KernelResult result = Reprotect(address, pagesCount, permission);
+
+                        if (result != KernelResult.Success)
+                        {
+                            return result;
+                        }
+
+                        _blockManager.InsertBlock(address, pagesCount, oldState, permission);
+                    }
+
+                    return KernelResult.Success;
+                }
+                else
+                {
+                    return KernelResult.InvalidMemState;
+                }
+            }
+        }
+
         public ulong GetTotalHeapSize()
         {
             lock (_blockManager)

Ryujinx.HLE/HOS/Kernel/Memory/MemoryPermission.cs

@@ -3,14 +3,15 @@ using System;
 namespace Ryujinx.HLE.HOS.Kernel.Memory
 {
     [Flags]
-    enum KMemoryPermission : byte
+    enum KMemoryPermission : uint
     {
         None = 0,
-        Mask = 0xff,
+        Mask = uint.MaxValue,
 
-        Read    = 1 << 0,
-        Write   = 1 << 1,
-        Execute = 1 << 2,
+        Read     = 1 << 0,
+        Write    = 1 << 1,
+        Execute  = 1 << 2,
+        DontCare = 1 << 28,
 
         ReadAndWrite   = Read | Write,
         ReadAndExecute = Read | Execute

Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs

@@ -819,6 +819,38 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
             return process.MemoryManager.SetHeapSize(size, out position);
         }
 
+        public KernelResult SetMemoryPermission(ulong address, ulong size, KMemoryPermission permission)
+        {
+            if (!PageAligned(address))
+            {
+                return KernelResult.InvalidAddress;
+            }
+
+            if (!PageAligned(size) || size == 0)
+            {
+                return KernelResult.InvalidSize;
+            }
+
+            if (address + size <= address)
+            {
+                return KernelResult.InvalidMemState;
+            }
+
+            if (permission == KMemoryPermission.None || (permission | KMemoryPermission.Write) != KMemoryPermission.ReadAndWrite)
+            {
+                return KernelResult.InvalidPermission;
+            }
+
+            KProcess currentProcess = KernelStatic.GetCurrentProcess();
+
+            if (!currentProcess.MemoryManager.InsideAddrSpace(address, size))
+            {
+                return KernelResult.InvalidMemState;
+            }
+
+            return currentProcess.MemoryManager.SetMemoryPermission(address, size, permission);
+        }
+
         public KernelResult SetMemoryAttribute(
             ulong position,
             ulong size,

Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall32.cs

@@ -88,6 +88,14 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
             return result;
         }
 
+        public KernelResult SetMemoryPermission32(
+            [R(0)] ulong position,
+            [R(1)] ulong size,
+            [R(2)] KMemoryPermission permission)
+        {
+            return _syscall.SetMemoryPermission(position, size, permission);
+        }
+
         public KernelResult SetMemoryAttribute32(
             [R(0)] uint position,
             [R(1)] uint size,

Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall64.cs

@@ -109,6 +109,14 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
             return _syscall.SetHeapSize(size, out position);
         }
 
+        public KernelResult SetMemoryPermission64(
+            [R(0)] ulong position,
+            [R(1)] ulong size,
+            [R(2)] KMemoryPermission permission)
+        {
+            return _syscall.SetMemoryPermission(position, size, permission);
+        }
+
         public KernelResult SetMemoryAttribute64(
             [R(0)] ulong position,
             [R(1)] ulong size,

Ryujinx.HLE/HOS/Kernel/SupervisorCall/SyscallTable.cs

@@ -25,6 +25,7 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
             Dictionary<int, string> svcFuncs64 = new Dictionary<int, string>
             {
                 { 0x01, nameof(Syscall64.SetHeapSize64)                    },
+                { 0x02, nameof(Syscall64.SetMemoryPermission64)            },
                 { 0x03, nameof(Syscall64.SetMemoryAttribute64)             },
                 { 0x04, nameof(Syscall64.MapMemory64)                      },
                 { 0x05, nameof(Syscall64.UnmapMemory64)                    },
@@ -94,6 +95,7 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
             Dictionary<int, string> svcFuncs32 = new Dictionary<int, string>
             {
                 { 0x01, nameof(Syscall32.SetHeapSize32)                   },
+                { 0x02, nameof(Syscall32.SetMemoryPermission32)           },
                 { 0x03, nameof(Syscall32.SetMemoryAttribute32)            },
                 { 0x04, nameof(Syscall32.MapMemory32)                     },
                 { 0x05, nameof(Syscall32.UnmapMemory32)                   },