Initial work

Ryujinx.Common/PerformanceCounter.cs

@@ -1,9 +1,11 @@
-using System.Diagnostics;
+using System.Diagnostics;
 
 namespace Ryujinx.Common
 {
     public static class PerformanceCounter
     {
+        private static double _ticksToNs;
+
         /// <summary>
         /// Represents the number of ticks in 1 day.
         /// </summary>
@@ -53,6 +55,19 @@ namespace Ryujinx.Common
             }
         }
 
+        /// <summary>
+        /// Gets the number of nanoseconds elapsed since the system started.
+        /// </summary>
+        public static long ElapsedNanoseconds
+        {
+            get
+            {
+                long timestamp = Stopwatch.GetTimestamp();
+
+                return (long)(timestamp * _ticksToNs);
+            }
+        }
+
         static PerformanceCounter()
         {
             TicksPerMillisecond = Stopwatch.Frequency / 1000;
@@ -60,6 +75,8 @@ namespace Ryujinx.Common
             TicksPerMinute      = TicksPerSecond * 60;
             TicksPerHour        = TicksPerMinute * 60;
             TicksPerDay         = TicksPerHour * 24;
+
+            _ticksToNs = 1000000000.0 / (double)Stopwatch.Frequency;
         }
     }
-}
+}