Ryujinx/ARMeilleure/Translation/JitCache.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

137 lines
3.9 KiB
C#

using ARMeilleure.CodeGen;
using ARMeilleure.Memory;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace ARMeilleure.Translation
{
static class JitCache
{
private const int PageSize = 4 * 1024;
private const int PageMask = PageSize - 1;
private const int CodeAlignment = 4; // Bytes
private const int CacheSize = 2047 * 1024 * 1024;
private static ReservedRegion _jitRegion;
private static int _offset;
private static readonly List<JitCacheEntry> _cacheEntries = new List<JitCacheEntry>();
private static readonly object _lock = new object();
private static bool _initialized;
public static void Initialize(IJitMemoryAllocator allocator)
{
if (_initialized) return;
lock (_lock)
{
if (_initialized) return;
_jitRegion = new ReservedRegion(allocator, CacheSize);
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
_jitRegion.ExpandIfNeeded(PageSize);
JitUnwindWindows.InstallFunctionTableHandler(_jitRegion.Pointer, CacheSize);
// The first page is used for the table based SEH structs.
_offset = PageSize;
}
_initialized = true;
}
}
public static IntPtr Map(CompiledFunction func)
{
byte[] code = func.Code;
lock (_lock)
{
Debug.Assert(_initialized);
int funcOffset = Allocate(code.Length);
IntPtr funcPtr = _jitRegion.Pointer + funcOffset;
Marshal.Copy(code, 0, funcPtr, code.Length);
ReprotectRange(funcOffset, code.Length);
Add(new JitCacheEntry(funcOffset, code.Length, func.UnwindInfo));
return funcPtr;
}
}
private static void ReprotectRange(int offset, int size)
{
// Map pages that are already full as RX.
// Map pages that are not full yet as RWX.
// On unix, the address must be page aligned.
int endOffs = offset + size;
int pageStart = offset & ~PageMask;
int pageEnd = endOffs & ~PageMask;
int fullPagesSize = pageEnd - pageStart;
if (fullPagesSize != 0)
{
_jitRegion.Block.MapAsRx((ulong)pageStart, (ulong)fullPagesSize);
}
int remaining = endOffs - pageEnd;
if (remaining != 0)
{
_jitRegion.Block.MapAsRwx((ulong)pageEnd, (ulong)remaining);
}
}
private static int Allocate(int codeSize)
{
codeSize = checked(codeSize + (CodeAlignment - 1)) & ~(CodeAlignment - 1);
int allocOffset = _offset;
_offset += codeSize;
_jitRegion.ExpandIfNeeded((ulong)_offset);
if ((ulong)(uint)_offset > CacheSize)
{
throw new OutOfMemoryException();
}
return allocOffset;
}
private static void Add(JitCacheEntry entry)
{
_cacheEntries.Add(entry);
}
public static bool TryFind(int offset, out JitCacheEntry entry)
{
lock (_lock)
{
foreach (JitCacheEntry cacheEntry in _cacheEntries)
{
int endOffset = cacheEntry.Offset + cacheEntry.Size;
if (offset >= cacheEntry.Offset && offset < endOffset)
{
entry = cacheEntry;
return true;
}
}
}
entry = default;
return false;
}
}
}