| 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. |