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