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ryujinx-fork/Ryujinx.HLE/HOS/Services/Time/TimeSharedMemory.cs
gdkchan 0c87bf9ea4
Refactor CPU interface to allow the implementation of other CPU emulators (#3362)
* Refactor CPU interface

* Use IExecutionContext interface on SVC handler, change how CPU interrupts invokes the handlers

* Make CpuEngine take a ITickSource rather than returning one

The previous implementation had the scenario where the CPU engine had to implement the tick source in mind, like for example, when we have a hypervisor and the game can read CNTPCT on the host directly. However given that we need to do conversion due to different frequencies anyway, it's not worth it. It's better to just let the user pass the tick source and redirect any reads to CNTPCT to the user tick source

* XML docs for the public interfaces

* PPTC invalidation due to NativeInterface function name changes

* Fix build of the CPU tests

* PR feedback
2022-05-31 16:29:35 -03:00

114 lines
4.3 KiB
C#

using Ryujinx.Cpu;
using Ryujinx.HLE.HOS.Kernel.Memory;
using Ryujinx.HLE.HOS.Services.Time.Clock;
using Ryujinx.HLE.HOS.Services.Time.Types;
using Ryujinx.HLE.Utilities;
using System;
using System.Runtime.CompilerServices;
using System.Threading;
namespace Ryujinx.HLE.HOS.Services.Time
{
class TimeSharedMemory
{
private Switch _device;
private KSharedMemory _sharedMemory;
private SharedMemoryStorage _timeSharedMemoryStorage;
private int _timeSharedMemorySize;
private const uint SteadyClockContextOffset = 0x00;
private const uint LocalSystemClockContextOffset = 0x38;
private const uint NetworkSystemClockContextOffset = 0x80;
private const uint AutomaticCorrectionEnabledOffset = 0xC8;
public void Initialize(Switch device, KSharedMemory sharedMemory, SharedMemoryStorage timeSharedMemoryStorage, int timeSharedMemorySize)
{
_device = device;
_sharedMemory = sharedMemory;
_timeSharedMemoryStorage = timeSharedMemoryStorage;
_timeSharedMemorySize = timeSharedMemorySize;
// Clean the shared memory
timeSharedMemoryStorage.ZeroFill();
}
public KSharedMemory GetSharedMemory()
{
return _sharedMemory;
}
public void SetupStandardSteadyClock(ITickSource tickSource, UInt128 clockSourceId, TimeSpanType currentTimePoint)
{
TimeSpanType ticksTimeSpan = TimeSpanType.FromTicks(tickSource.Counter, tickSource.Frequency);
SteadyClockContext context = new SteadyClockContext
{
InternalOffset = (ulong)(currentTimePoint.NanoSeconds - ticksTimeSpan.NanoSeconds),
ClockSourceId = clockSourceId
};
WriteObjectToSharedMemory(SteadyClockContextOffset, 4, context);
}
public void SetAutomaticCorrectionEnabled(bool isAutomaticCorrectionEnabled)
{
// We convert the bool to byte here as a bool in C# takes 4 bytes...
WriteObjectToSharedMemory(AutomaticCorrectionEnabledOffset, 0, Convert.ToByte(isAutomaticCorrectionEnabled));
}
public void SetSteadyClockRawTimePoint(ITickSource tickSource, TimeSpanType currentTimePoint)
{
SteadyClockContext context = ReadObjectFromSharedMemory<SteadyClockContext>(SteadyClockContextOffset, 4);
TimeSpanType ticksTimeSpan = TimeSpanType.FromTicks(tickSource.Counter, tickSource.Frequency);
context.InternalOffset = (ulong)(currentTimePoint.NanoSeconds - ticksTimeSpan.NanoSeconds);
WriteObjectToSharedMemory(SteadyClockContextOffset, 4, context);
}
public void UpdateLocalSystemClockContext(SystemClockContext context)
{
WriteObjectToSharedMemory(LocalSystemClockContextOffset, 4, context);
}
public void UpdateNetworkSystemClockContext(SystemClockContext context)
{
WriteObjectToSharedMemory(NetworkSystemClockContextOffset, 4, context);
}
private T ReadObjectFromSharedMemory<T>(ulong offset, ulong padding) where T : unmanaged
{
T result;
uint index;
uint possiblyNewIndex;
do
{
index = _timeSharedMemoryStorage.GetRef<uint>(offset);
ulong objectOffset = offset + 4 + padding + (ulong)((index & 1) * Unsafe.SizeOf<T>());
result = _timeSharedMemoryStorage.GetRef<T>(objectOffset);
Thread.MemoryBarrier();
possiblyNewIndex = _device.Memory.Read<uint>(offset);
} while (index != possiblyNewIndex);
return result;
}
private void WriteObjectToSharedMemory<T>(ulong offset, ulong padding, T value) where T : unmanaged
{
uint newIndex = _timeSharedMemoryStorage.GetRef<uint>(offset) + 1;
ulong objectOffset = offset + 4 + padding + (ulong)((newIndex & 1) * Unsafe.SizeOf<T>());
_timeSharedMemoryStorage.GetRef<T>(objectOffset) = value;
Thread.MemoryBarrier();
_timeSharedMemoryStorage.GetRef<uint>(offset) = newIndex;
}
}
}