ryujinx/Ryujinx.Memory/MemoryManagementUnix.cs
gdkchan f77694e4f7
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
2020-05-04 08:54:50 +10:00

75 lines
2.5 KiB
C#

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;
}
}
}