Based on kernel version 2.6.39.1. Page generated on 2011-06-03 13:46 EST.
1 Kernel driver pkgtemp 2 ====================== 3 4 Supported chips: 5 * Intel family 6 Prefix: 'pkgtemp' 7 CPUID: 8 Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual 9 Volume 3A: System Programming Guide 10 11 Author: Fenghua Yu 12 13 Description 14 ----------- 15 16 This driver permits reading package level temperature sensor embedded inside 17 Intel CPU package. The sensors can be in core, uncore, memory controller, or 18 other components in a package. The feature is first implemented in Intel Sandy 19 Bridge platform. 20 21 Temperature is measured in degrees Celsius and measurement resolution is 22 1 degree C. Valid temperatures are from 0 to TjMax degrees C, because the actual 23 value of temperature register is in fact a delta from TjMax. 24 25 Temperature known as TjMax is the maximum junction temperature of package. 26 We get this from MSR_IA32_TEMPERATURE_TARGET. If the MSR is not accessible, 27 we define TjMax as 100 degrees Celsius. At this temperature, protection 28 mechanism will perform actions to forcibly cool down the package. Alarm 29 may be raised, if the temperature grows enough (more than TjMax) to trigger 30 the Out-Of-Spec bit. Following table summarizes the exported sysfs files: 31 32 temp1_input - Package temperature (in millidegrees Celsius). 33 temp1_max - All cooling devices should be turned on. 34 temp1_crit - Maximum junction temperature (in millidegrees Celsius). 35 temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. 36 Correct CPU operation is no longer guaranteed.