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k8temp

k8temp 1.9 KB
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  1. Kernel driver k8temp
    2. 

  2. ====================
    3. 

  3. 

  4. Supported chips:
    5. 

  5.   * AMD K8 CPU
    6. 

  6.     Prefix: 'k8temp'
    7. 

  7.     Addresses scanned: PCI space
    8. 

  8.     Datasheet: http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf
    9. 

  9. 

  10. Author: Rudolf Marek
    11. 

  11. Contact: Rudolf Marek <r.marek@sh.cvut.cz>
    12. 

  12. 

  13. Description
    14. 

  14. -----------
    15. 

  15. 

  16. This driver permits reading temperature sensor(s) embedded inside AMD K8 CPUs.
    17. 

  17. Official documentation says that it works from revision F of K8 core, but
    18. 

  18. in fact it seems to be implemented for all revisions of K8 except the first
    19. 

  19. two revisions (SH-B0 and SH-B3).
    20. 

  20. 

  21. There can be up to four temperature sensors inside single CPU. The driver
    22. 

  22. will auto-detect the sensors and will display only temperatures from
    23. 

  23. implemented sensors.
    24. 

  24. 

  25. Mapping of /sys files is as follows:
    26. 

  26. 

  27. temp1_input - temperature of Core 0 and "place" 0
    28. 

  28. temp2_input - temperature of Core 0 and "place" 1
    29. 

  29. temp3_input - temperature of Core 1 and "place" 0
    30. 

  30. temp4_input - temperature of Core 1 and "place" 1
    31. 

  31. 

  32. Temperatures are measured in degrees Celsius and measurement resolution is
    33. 

  33. 1 degree C. It is expected that future CPU will have better resolution. The
    34. 

  34. temperature is updated once a second. Valid temperatures are from -49 to
    35. 

  35. 206 degrees C.
    36. 

  36. 

  37. Temperature known as TCaseMax was specified for processors up to revision E.
    38. 

  38. This temperature is defined as temperature between heat-spreader and CPU
    39. 

  39. case, so the internal CPU temperature supplied by this driver can be higher.
    40. 

  40. There is no easy way how to measure the temperature which will correlate
    41. 

  41. with TCaseMax temperature.
    42. 

  42. 

  43. For newer revisions of CPU (rev F, socket AM2) there is a mathematically
    44. 

  44. computed temperature called TControl, which must be lower than TControlMax.
    45. 

  45. 

  46. The relationship is following:
    47. 

  47. 

  48. temp1_input - TjOffset*2 < TControlMax,
    49. 

  49. 

  50. TjOffset is not yet exported by the driver, TControlMax is usually
    51. 

  51. 70 degrees C. The rule of the thumb -> CPU temperature should not cross
    52. 

  52. 60 degrees C too much.
    53.