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using Ryujinx.Memory.WindowsShared;
using System;
using System.Runtime.Versioning;
namespace Ryujinx.Memory
{
[SupportedOSPlatform("windows")]
static class MemoryManagementWindows
{
public const int PageSize = 0x1000;
private static readonly PlaceholderManager _placeholders = new PlaceholderManager();
public static IntPtr Allocate(IntPtr size)
{
return AllocateInternal(size, AllocationType.Reserve | AllocationType.Commit);
}
public static IntPtr Reserve(IntPtr size, bool viewCompatible)
{
if (viewCompatible)
{
IntPtr baseAddress = AllocateInternal2(size, AllocationType.Reserve | AllocationType.ReservePlaceholder);
_placeholders.ReserveRange((ulong)baseAddress, (ulong)size);
return baseAddress;
}
return AllocateInternal(size, AllocationType.Reserve);
}
private static IntPtr AllocateInternal(IntPtr size, AllocationType flags = 0)
{
IntPtr ptr = WindowsApi.VirtualAlloc(IntPtr.Zero, size, flags, MemoryProtection.ReadWrite);
if (ptr == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
return ptr;
}
private static IntPtr AllocateInternal2(IntPtr size, AllocationType flags = 0)
{
IntPtr ptr = WindowsApi.VirtualAlloc2(WindowsApi.CurrentProcessHandle, IntPtr.Zero, size, flags, MemoryProtection.NoAccess, IntPtr.Zero, 0);
if (ptr == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
return ptr;
}
public static bool Commit(IntPtr location, IntPtr size)
{
return WindowsApi.VirtualAlloc(location, size, AllocationType.Commit, MemoryProtection.ReadWrite) != IntPtr.Zero;
}
public static bool Decommit(IntPtr location, IntPtr size)
{
return WindowsApi.VirtualFree(location, size, AllocationType.Decommit);
}
public static void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, MemoryBlock owner)
{
_placeholders.MapView(sharedMemory, srcOffset, location, size, owner);
}
public static void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
{
_placeholders.UnmapView(sharedMemory, location, size, owner);
}
public static bool Reprotect(IntPtr address, IntPtr size, MemoryPermission permission, bool forView)
{
if (forView)
{
return _placeholders.ReprotectView(address, size, permission);
}
else
{
return WindowsApi.VirtualProtect(address, size, WindowsApi.GetProtection(permission), out _);
}
}
public static bool Free(IntPtr address, IntPtr size)
{
_placeholders.UnreserveRange((ulong)address, (ulong)size);
return WindowsApi.VirtualFree(address, IntPtr.Zero, AllocationType.Release);
}
public static IntPtr CreateSharedMemory(IntPtr size, bool reserve)
{
var prot = reserve ? FileMapProtection.SectionReserve : FileMapProtection.SectionCommit;
IntPtr handle = WindowsApi.CreateFileMapping(
WindowsApi.InvalidHandleValue,
IntPtr.Zero,
FileMapProtection.PageReadWrite | prot,
(uint)(size.ToInt64() >> 32),
(uint)size.ToInt64(),
null);
if (handle == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
return handle;
}
public static void DestroySharedMemory(IntPtr handle)
{
if (!WindowsApi.CloseHandle(handle))
{
throw new ArgumentException("Invalid handle.", nameof(handle));
}
}
public static IntPtr MapSharedMemory(IntPtr handle)
{
IntPtr ptr = WindowsApi.MapViewOfFile(handle, 4 | 2, 0, 0, IntPtr.Zero);
if (ptr == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
return ptr;
}
public static void UnmapSharedMemory(IntPtr address)
{
if (!WindowsApi.UnmapViewOfFile(address))
{
throw new ArgumentException("Invalid address.", nameof(address));
}
}
}
}
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