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LibreHardwareMonitor-0.9.4/LibreHardwareMonitorLib/Hardware/Cpu/AmdCpu.cs

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+// 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.
+// Partial Copyright (C) Michael Möller <mmoeller@openhardwaremonitor.org> and Contributors.
+// All Rights Reserved.
+
+namespace LibreHardwareMonitor.Hardware.Cpu;
+
+internal abstract class AmdCpu : GenericCpu
+{
+    protected AmdCpu(int processorIndex, CpuId[][] cpuId, ISettings settings) : base(processorIndex, cpuId, settings)
+    { }
+
+    protected uint GetPciAddress(byte function, ushort deviceId)
+    {
+        // assemble the pci address
+        uint address = Ring0.GetPciAddress(PCI_BUS, (byte)(PCI_BASE_DEVICE + Index), function);
+
+        // verify that we have the correct bus, device and function
+        if (!Ring0.ReadPciConfig(address, DEVICE_VENDOR_ID_REGISTER, out uint deviceVendor))
+            return Interop.Ring0.INVALID_PCI_ADDRESS;
+
+        if (deviceVendor != (deviceId << 16 | AMD_VENDOR_ID))
+            return Interop.Ring0.INVALID_PCI_ADDRESS;
+
+        return address;
+    }
+
+    // ReSharper disable InconsistentNaming
+    private const ushort AMD_VENDOR_ID = 0x1022;
+    private const byte DEVICE_VENDOR_ID_REGISTER = 0;
+    private const byte PCI_BASE_DEVICE = 0x18;
+
+    private const byte PCI_BUS = 0;
+    // ReSharper restore InconsistentNaming
+}