Ryujinx/Ryujinx.Memory/MemoryAllocationFlags.cs
gdkchan 95017b8c66
Support memory aliasing (#2954)
* Back to the origins: Make memory manager take guest PA rather than host address once again

* Direct mapping with alias support on Windows

* Fixes and remove more of the emulated shared memory

* Linux support

* Make shared and transfer memory not depend on SharedMemoryStorage

* More efficient view mapping on Windows (no more restricted to 4KB pages at a time)

* Handle potential access violations caused by partial unmap

* Implement host mapping using shared memory on Linux

* Add new GetPhysicalAddressChecked method, used to ensure the virtual address is mapped before address translation

Also align GetRef behaviour with software memory manager

* We don't need a mirrorable memory block for software memory manager mode

* Disable memory aliasing tests while we don't have shared memory support on Mac

* Shared memory & SIGBUS handler for macOS

* Fix typo + nits + re-enable memory tests

* Set MAP_JIT_DARWIN on x86 Mac too

* Add back the address space mirror

* Only set MAP_JIT_DARWIN if we are mapping as executable

* Disable aliasing tests again (still fails on Mac)

* Fix UnmapView4KB (by not casting size to int)

* Use ref counting on memory blocks to delay closing the shared memory handle until all blocks using it are disposed

* Address PR feedback

* Make RO hold a reference to the guest process memory manager to avoid early disposal

Co-authored-by: nastys <nastys@users.noreply.github.com>
2022-05-02 20:30:02 -03:00

46 lines
1.6 KiB
C#

using System;
namespace Ryujinx.Memory
{
/// <summary>
/// Flags that controls allocation and other properties of the memory block memory.
/// </summary>
[Flags]
public enum MemoryAllocationFlags
{
/// <summary>
/// No special allocation settings.
/// </summary>
None = 0,
/// <summary>
/// Reserve a region of memory on the process address space,
/// without actually allocation any backing memory.
/// </summary>
Reserve = 1 << 0,
/// <summary>
/// Enables read and write tracking of the memory block.
/// This currently does nothing and is reserved for future use.
/// </summary>
Tracked = 1 << 1,
/// <summary>
/// Enables mirroring of the memory block through aliasing of memory pages.
/// When enabled, this allows creating more memory blocks sharing the same backing storage.
/// </summary>
Mirrorable = 1 << 2,
/// <summary>
/// Indicates that the memory block should support mapping views of a mirrorable memory block.
/// The block that is to have their views mapped should be created with the <see cref="Mirrorable"/> flag.
/// </summary>
ViewCompatible = 1 << 3,
/// <summary>
/// Forces views to be mapped page by page on Windows. When partial unmaps are done, this avoids the need
/// to unmap the full range and remap sub-ranges, which creates a time window with incorrectly unmapped memory.
/// </summary>
ForceWindows4KBViewMapping = 1 << 4
}
}