mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-19 23:28:42 +02:00
106 lines
3.4 KiB
C#
106 lines
3.4 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace Ryujinx.Memory
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{
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static class MemoryManagementWindows
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{
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[Flags]
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private enum AllocationType : uint
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{
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Commit = 0x1000,
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Reserve = 0x2000,
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Decommit = 0x4000,
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Release = 0x8000,
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Reset = 0x80000,
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Physical = 0x400000,
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TopDown = 0x100000,
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WriteWatch = 0x200000,
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LargePages = 0x20000000
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}
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[Flags]
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private enum MemoryProtection : uint
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{
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NoAccess = 0x01,
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ReadOnly = 0x02,
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ReadWrite = 0x04,
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WriteCopy = 0x08,
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Execute = 0x10,
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ExecuteRead = 0x20,
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ExecuteReadWrite = 0x40,
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ExecuteWriteCopy = 0x80,
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GuardModifierflag = 0x100,
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NoCacheModifierflag = 0x200,
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WriteCombineModifierflag = 0x400
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}
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[DllImport("kernel32.dll")]
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private static extern IntPtr VirtualAlloc(
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IntPtr lpAddress,
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IntPtr dwSize,
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AllocationType flAllocationType,
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MemoryProtection flProtect);
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[DllImport("kernel32.dll")]
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private static extern bool VirtualProtect(
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IntPtr lpAddress,
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IntPtr dwSize,
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MemoryProtection flNewProtect,
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out MemoryProtection lpflOldProtect);
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[DllImport("kernel32.dll")]
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private static extern bool VirtualFree(IntPtr lpAddress, IntPtr dwSize, AllocationType dwFreeType);
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public static IntPtr Allocate(IntPtr size)
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{
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return AllocateInternal(size, AllocationType.Reserve | AllocationType.Commit);
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}
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public static IntPtr Reserve(IntPtr size)
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{
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return AllocateInternal(size, AllocationType.Reserve);
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}
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private static IntPtr AllocateInternal(IntPtr size, AllocationType flags = 0)
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{
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IntPtr ptr = VirtualAlloc(IntPtr.Zero, size, flags, MemoryProtection.ReadWrite);
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if (ptr == IntPtr.Zero)
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{
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throw new OutOfMemoryException();
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}
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return ptr;
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}
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public static bool Commit(IntPtr location, IntPtr size)
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{
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return VirtualAlloc(location, size, AllocationType.Commit, MemoryProtection.ReadWrite) != IntPtr.Zero;
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}
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public static bool Reprotect(IntPtr address, IntPtr size, MemoryPermission permission)
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{
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return VirtualProtect(address, size, GetProtection(permission), out _);
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}
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private static MemoryProtection GetProtection(MemoryPermission permission)
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{
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return permission switch
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{
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MemoryPermission.None => MemoryProtection.NoAccess,
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MemoryPermission.Read => MemoryProtection.ReadOnly,
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MemoryPermission.ReadAndWrite => MemoryProtection.ReadWrite,
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MemoryPermission.ReadAndExecute => MemoryProtection.ExecuteRead,
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MemoryPermission.ReadWriteExecute => MemoryProtection.ExecuteReadWrite,
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MemoryPermission.Execute => MemoryProtection.Execute,
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_ => throw new MemoryProtectionException(permission)
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};
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}
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public static bool Free(IntPtr address)
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{
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return VirtualFree(address, IntPtr.Zero, AllocationType.Release);
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}
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}
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}
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