1Kernel driver coretemp 2====================== 3 4Supported chips: 5 * All Intel Core family 6 Prefix: 'coretemp' 7 CPUID: family 0x6, models 0xe, 0xf, 0x16, 0x17 8 Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual 9 Volume 3A: System Programming Guide 10 http://softwarecommunity.intel.com/Wiki/Mobility/720.htm 11 12Author: Rudolf Marek 13 14Description 15----------- 16 17This driver permits reading temperature sensor embedded inside Intel Core CPU. 18Temperature is measured in degrees Celsius and measurement resolution is 191 degree C. Valid temperatures are from 0 to TjMax degrees C, because 20the actual value of temperature register is in fact a delta from TjMax. 21 22Temperature known as TjMax is the maximum junction temperature of processor. 23Intel defines this temperature as 85C or 100C. At this temperature, protection 24mechanism will perform actions to forcibly cool down the processor. Alarm 25may be raised, if the temperature grows enough (more than TjMax) to trigger 26the Out-Of-Spec bit. Following table summarizes the exported sysfs files: 27 28temp1_input - Core temperature (in millidegrees Celsius). 29temp1_max - All cooling devices should be turned on (on Core2). 30temp1_crit - Maximum junction temperature (in millidegrees Celsius). 31temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. 32 Correct CPU operation is no longer guaranteed. 33temp1_label - Contains string "Core X", where X is processor 34 number. 35 36The TjMax temperature is set to 85 degrees C if undocumented model specific 37register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as 38(sometimes) documented in processor datasheet. 39