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1 | Kernel driver coretemp |
2 | ====================== | |
3 | ||
4 | Supported chips: | |
5 | * All Intel Core family | |
6 | Prefix: 'coretemp' | |
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7 | CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm), |
8 | 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm), | |
9 | 0x1a (Nehalem), 0x1c (Atom). | |
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10 | Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual |
11 | Volume 3A: System Programming Guide | |
ae770152 | 12 | http://softwarecommunity.intel.com/Wiki/Mobility/720.htm |
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13 | |
14 | Author: Rudolf Marek | |
15 | ||
16 | Description | |
17 | ----------- | |
18 | ||
19 | This driver permits reading temperature sensor embedded inside Intel Core CPU. | |
20 | Temperature is measured in degrees Celsius and measurement resolution is | |
21 | 1 degree C. Valid temperatures are from 0 to TjMax degrees C, because | |
22 | the actual value of temperature register is in fact a delta from TjMax. | |
23 | ||
24 | Temperature known as TjMax is the maximum junction temperature of processor. | |
25 | Intel defines this temperature as 85C or 100C. At this temperature, protection | |
26 | mechanism will perform actions to forcibly cool down the processor. Alarm | |
27 | may be raised, if the temperature grows enough (more than TjMax) to trigger | |
28 | the Out-Of-Spec bit. Following table summarizes the exported sysfs files: | |
29 | ||
30 | temp1_input - Core temperature (in millidegrees Celsius). | |
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31 | temp1_max - All cooling devices should be turned on (on Core2). |
32 | temp1_crit - Maximum junction temperature (in millidegrees Celsius). | |
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33 | temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. |
34 | Correct CPU operation is no longer guaranteed. | |
35 | temp1_label - Contains string "Core X", where X is processor | |
36 | number. | |
37 | ||
38 | The TjMax temperature is set to 85 degrees C if undocumented model specific | |
39 | register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as | |
40 | (sometimes) documented in processor datasheet. |