/*

   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) 2009-2010 Michael Möller <mmoeller@openhardwaremonitor.org>

 */

 namespace OpenHardwareMonitor.Hardware.CPU {

   internal abstract class AMDCPU : GenericCPU {

     private const byte PCI_BUS = 0;

     private const byte PCI_BASE_DEVICE = 0x18;

     private const byte DEVICE_VENDOR_ID_REGISTER = 0;

     private const ushort AMD_VENDOR_ID = 0x1022;

     public 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 + processorIndex), function);

       // verify that we have the correct bus, device and function

       uint deviceVendor;

       if (!Ring0.ReadPciConfig(

         address, DEVICE_VENDOR_ID_REGISTER, out deviceVendor))

         return Ring0.InvalidPciAddress;

       if (deviceVendor != (deviceId << 16 | AMD_VENDOR_ID))

         return Ring0.InvalidPciAddress;

       return address;

     }

   }

 }