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- Kernel driver coretemp
- ======================
- Supported chips:
- * All Intel Core family
- Prefix: 'coretemp'
- CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
- 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
- 0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield)
- 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 the DTS (Digital Temperature Sensor) embedded
- inside Intel CPUs. This driver can read both the per-core and per-package
- temperature using the appropriate sensors. The per-package sensor is new;
- as of now, it is present only in the SandyBridge platform. The driver will
- show the temperature of all cores inside a package under a single device
- directory inside hwmon.
- 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,
- which depends on the CPU model. See table below. 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:
- All Sysfs entries are named with their core_id (represented here by 'X').
- tempX_input - Core temperature (in millidegrees Celsius).
- tempX_max - All cooling devices should be turned on (on Core2).
- Initialized with IA32_THERM_INTERRUPT. When the CPU
- temperature reaches this temperature, an interrupt is
- generated and tempX_max_alarm is set.
- tempX_max_hyst - If the CPU temperature falls below than temperature,
- an interrupt is generated and tempX_max_alarm is reset.
- tempX_max_alarm - Set if the temperature reaches or exceeds tempX_max.
- Reset if the temperature drops to or below tempX_max_hyst.
- tempX_crit - Maximum junction temperature (in millidegrees Celsius).
- tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
- Correct CPU operation is no longer guaranteed.
- tempX_label - Contains string "Core X", where X is processor
- number. For Package temp, this will be "Physical id Y",
- where Y is the package 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.
- Appendix A. Known TjMax lists (TBD):
- Some information comes from ark.intel.com
- Process Processor TjMax(C)
- 32nm Core i3/i5/i7 Processors
- i7 660UM/640/620, 640LM/620, 620M, 610E 105
- i5 540UM/520/430, 540M/520/450/430 105
- i3 330E, 370M/350/330 90 rPGA, 105 BGA
- i3 330UM 105
- 32nm Core i7 Extreme Processors
- 980X 100
- 32nm Celeron Processors
- U3400 105
- P4505/P4500 90
- 45nm Xeon Processors 5400 Quad-Core
- X5492, X5482, X5472, X5470, X5460, X5450 85
- E5472, E5462, E5450/40/30/20/10/05 85
- L5408 95
- L5430, L5420, L5410 70
- 45nm Xeon Processors 5200 Dual-Core
- X5282, X5272, X5270, X5260 90
- E5240 90
- E5205, E5220 70, 90
- L5240 70
- L5238, L5215 95
- 45nm Atom Processors
- D525/510/425/410 100
- Z560/550/540/530P/530/520PT/520/515/510PT/510P 90
- Z510/500 90
- N475/470/455/450 100
- N280/270 90
- 330/230 125
- 45nm Core2 Processors
- Solo ULV SU3500/3300 100
- T9900/9800/9600/9550/9500/9400/9300/8300/8100 105
- T6670/6500/6400 105
- T6600 90
- SU9600/9400/9300 105
- SP9600/9400 105
- SL9600/9400/9380/9300 105
- P9700/9600/9500/8800/8700/8600/8400/7570 105
- P7550/7450 90
- 45nm Core2 Quad Processors
- Q9100/9000 100
- 45nm Core2 Extreme Processors
- X9100/9000 105
- QX9300 100
- 45nm Core i3/i5/i7 Processors
- i7 940XM/920 100
- i7 840QM/820/740/720 100
- 45nm Celeron Processors
- SU2300 100
- 900 105
- 65nm Core2 Duo Processors
- Solo U2200, U2100 100
- U7700/7600/7500 100
- T7800/7700/7600/7500/7400/7300/7250/7200/7100 100
- T5870/5670/5600/5550/5500/5470/5450/5300/5270 100
- T5250 100
- T5800/5750/5200 85
- L7700/7500/7400/7300/7200 100
- 65nm Core2 Extreme Processors
- X7900/7800 100
- 65nm Core Duo Processors
- U2500/2400 100
- T2700/2600/2450/2400/2350/2300E/2300/2250/2050 100
- L2500/2400/2300 100
- 65nm Core Solo Processors
- U1500/1400/1300 100
- T1400/1350/1300/1250 100
- 65nm Xeon Processors 5000 Quad-Core
- X5000 90-95
- E5000 80
- L5000 70
- L5318 95
- 65nm Xeon Processors 5000 Dual-Core
- 5080, 5063, 5060, 5050, 5030 80-90
- 5160, 5150, 5148, 5140, 5130, 5120, 5110 80
- L5138 100
- 65nm Celeron Processors
- T1700/1600 100
- 560/550/540/530 100
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