2 Replies Latest reply on Jan 29, 2010 3:01 AM by Emanprinting

    How to understand:Reading register F3xA4

    mabra

      Hallo !

      I really look for help. I am using an open source library for ring0 access [WinRing0] and try to read this register, to obtain the temperature. But I always get zero. So I assume, I do not understand to provide the parameters right. I found code in another forum - the threads ended - but this dont helped me.

      My main problem is, that I do not understand the "F3" value. If I look at the method signature of the mentioned libraries function "ReadPciConfigDwordEx", I have to provide the following:

       

      0- 2
      Function Number
      3- 7
      Device Number
      8-15
      PCI Bus Number
      16-31
      Reserved
      0- 2
      Function Number
      3- 7
      Device Number
      8-15
      PCI Bus Number
      16-31
      Reserved
      0- 2 Function Number
      3- 7 Device Number
      8-15 PCI Bus Number
      16-31 Reserved

      From that others forums thread, I derived the following:

      UInt32 pciAddress = 0x3+((0x18)<<3); //This should be "F3" !!!?????
      UInt32 regAddress = 0xa4;
      UInt32 value1 = 0;
      int result = ReadPciConfigDwordEx(pciAddress, regAddress, ref value1);

      This always return zero.

      I hope, someone could shed some light on this !!

      Thanks anyway,
      br--mabra

       

        • How to understand:Reading register F3xA4
          Crashtest

          AMD K8/K10/K11 CPUs got some PCI devices, all use pci device 24 on the first pci bus.

          These pci devices got one PCI-Device Nb - 24 / 0x18 on the first CPU with 4 or 5 functions or PCI Device Nb - 24 and 25 on a DUAL-Opteron System

          see http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116.pdf  -> 3.3 to 3.7

           

           

          The F3xA4 on a single K10 CPU:

          bus 0x0;

          device 0x18;

          func 0x3;

          register 0xA4;

          pciAddres: 

          as a 32 Bit Bin - 00000000000000000000000011000011

          or you could use 0XC3 as a hex

            • How to understand:Reading register F3xA4
              Emanprinting

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