R/Ryujinx.HLE/HOS/Services/Time/TimeSharedMemory.cs

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C#
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using System;
using System.Runtime.InteropServices;
using System.Threading;
using Ryujinx.HLE.HOS.Kernel.Memory;
using Ryujinx.HLE.HOS.Kernel.Threading;
using Ryujinx.HLE.HOS.Services.Time.Clock;
using Ryujinx.HLE.HOS.Services.Time.Types;
using Ryujinx.HLE.Utilities;
namespace Ryujinx.HLE.HOS.Services.Time
{
class TimeSharedMemory
{
private Switch _device;
private KSharedMemory _sharedMemory;
private long _timeSharedMemoryAddress;
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, long timeSharedMemoryAddress, int timeSharedMemorySize)
{
_device = device;
_sharedMemory = sharedMemory;
_timeSharedMemoryAddress = timeSharedMemoryAddress;
_timeSharedMemorySize = timeSharedMemorySize;
// Clean the shared memory
_device.Memory.FillWithZeros(_timeSharedMemoryAddress, _timeSharedMemorySize);
}
public KSharedMemory GetSharedMemory()
{
return _sharedMemory;
}
public void SetupStandardSteadyClock(KThread thread, UInt128 clockSourceId, TimeSpanType currentTimePoint)
{
TimeSpanType ticksTimeSpan;
// As this may be called before the guest code, we support passing a null thread to make this api usable.
if (thread == null)
{
ticksTimeSpan = TimeSpanType.FromSeconds(0);
}
else
{
ticksTimeSpan = TimeSpanType.FromTicks(thread.Context.CntpctEl0, thread.Context.CntfrqEl0);
}
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(KThread thread, TimeSpanType currentTimePoint)
{
SteadyClockContext context = ReadObjectFromSharedMemory<SteadyClockContext>(SteadyClockContextOffset, 4);
TimeSpanType ticksTimeSpan = TimeSpanType.FromTicks(thread.Context.CntpctEl0, thread.Context.CntfrqEl0);
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>(long offset, long padding)
{
long indexOffset = _timeSharedMemoryAddress + offset;
T result;
uint index;
uint possiblyNewIndex;
do
{
index = _device.Memory.ReadUInt32(indexOffset);
long objectOffset = indexOffset + 4 + padding + (index & 1) * Marshal.SizeOf<T>();
result = _device.Memory.ReadStruct<T>(objectOffset);
Thread.MemoryBarrier();
possiblyNewIndex = _device.Memory.ReadUInt32(indexOffset);
} while (index != possiblyNewIndex);
return result;
}
private void WriteObjectToSharedMemory<T>(long offset, long padding, T value)
{
long indexOffset = _timeSharedMemoryAddress + offset;
uint newIndex = _device.Memory.ReadUInt32(indexOffset) + 1;
long objectOffset = indexOffset + 4 + padding + (newIndex & 1) * Marshal.SizeOf<T>();
_device.Memory.WriteStruct(objectOffset, value);
Thread.MemoryBarrier();
_device.Memory.WriteUInt32(indexOffset, newIndex);
}
}
}