Ryujinx/ARMeilleure/Memory/ReservedRegion.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

53 lines
1.6 KiB
C#

using System;
namespace ARMeilleure.Memory
{
class ReservedRegion
{
private const int DefaultGranularity = 65536; // Mapping granularity in Windows.
public IJitMemoryBlock Block { get; }
public IntPtr Pointer => Block.Pointer;
private readonly ulong _maxSize;
private readonly ulong _sizeGranularity;
private ulong _currentSize;
public ReservedRegion(IJitMemoryAllocator allocator, ulong maxSize, ulong granularity = 0)
{
if (granularity == 0)
{
granularity = DefaultGranularity;
}
Block = allocator.Reserve(maxSize);
_maxSize = maxSize;
_sizeGranularity = granularity;
_currentSize = 0;
}
public void ExpandIfNeeded(ulong desiredSize)
{
if (desiredSize > _maxSize)
{
throw new OutOfMemoryException();
}
if (desiredSize > _currentSize)
{
// Lock, and then check again. We only want to commit once.
lock (this)
{
if (desiredSize >= _currentSize)
{
ulong overflowBytes = desiredSize - _currentSize;
ulong moreToCommit = (((_sizeGranularity - 1) + overflowBytes) / _sizeGranularity) * _sizeGranularity; // Round up.
Block.Commit(_currentSize, moreToCommit);
_currentSize += moreToCommit;
}
}
}
}
}
}