first commit

LibreHardwareMonitor-0.9.4/LibreHardwareMonitorLib/Interop/NtDll.cs

@@ -0,0 +1,53 @@
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+// Copyright (C) LibreHardwareMonitor and Contributors.
+// All Rights Reserved.
+
+using System.Runtime.InteropServices;
+
+// ReSharper disable InconsistentNaming
+
+namespace LibreHardwareMonitor.Interop;
+
+internal class NtDll
+{
+    private const string DllName = "ntdll.dll";
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION
+    {
+        public long IdleTime;
+        public long KernelTime;
+        public long UserTime;
+        public long DpcTime;
+        public long InterruptTime;
+        public uint InterruptCount;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal struct SYSTEM_PROCESSOR_IDLE_INFORMATION
+    {
+        public long IdleTime;
+        public long C1Time;
+        public long C2Time;
+        public long C3Time;
+        public uint C1Transitions;
+        public uint C2Transitions;
+        public uint C3Transitions;
+        public uint Padding;
+    }
+
+    internal enum SYSTEM_INFORMATION_CLASS
+    {
+        SystemProcessorPerformanceInformation = 8,
+        SystemProcessorIdleInformation = 42
+    }
+
+    [DllImport(DllName)]
+    [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
+    internal static extern int NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS SystemInformationClass, [Out] SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[] SystemInformation, int SystemInformationLength, out int ReturnLength);
+
+    [DllImport(DllName)]
+    [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
+    internal static extern int NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS SystemInformationClass, [Out] SYSTEM_PROCESSOR_IDLE_INFORMATION[] SystemInformation, int SystemInformationLength, out int ReturnLength);
+}