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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),
0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
0x36 (Cedar Trail Atom)


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).

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.


On CPU models which support it, TjMax is read from a model-specific register.
On other models, it is set to an arbitrary value based on weak heuristics.
If these heuristics don't work for you, you can pass the correct TjMax value
as a module parameter (tjmax).
Appendix A. Known TjMax lists (TBD):
Some information comes from ark.intel.com


Process
Processor
TjMax(C)

22nm
Core i5/i7 Processors
i7 3920XM, 3820QM, 3720QM, 3667U, 3520M
i5 3427U, 3360M/3320M
i7 3770/3770K
i5 3570/3570K, 3550, 3470/3450
i7 3770S
i5 3570S/3550S, 3475S/3470S/3450S
i7 3770T
i5 3570T
i5 3470T
105
105
105
105
103
103
94
94
91

32nm
Core i3/i5/i7 Processors
i7 2600
i7 660UM/640/620, 640LM/620, 620M, 610E
i5 540UM/520/430, 540M/520/450/430
i3 330E, 370M/350/330
i3 330UM
98
105
105
90 rPGA, 105 BGA
105

32nm
Core i7 Extreme Processors
980X
100

32nm
Celeron Processors
U3400
P4505/P4500
105
90

32nm
Atom Processors
S1260/1220
S1240
Z2460
Z2760
D2700/2550/2500
N2850/2800/2650/2600
95
102
90
90
100
100

45nm
Xeon Processors 5400 Quad-Core
X5492, X5482, X5472, X5470, X5460, X5450
E5472, E5462, E5450/40/30/20/10/05
L5408
L5430, L5420, L5410
85
85
95
70

45nm
Xeon Processors 5200 Dual-Core
X5282, X5272, X5270, X5260
E5240
E5205, E5220
L5240
L5238, L5215
90
90
70, 90
70
95

45nm
Atom Processors
D525/510/425/410
K525/510/425/410
Z670/650
Z560/550/540/530P/530/520PT/520/515/510PT/510P
Z510/500
N570/550
N475/470/455/450
N280/270
330/230
E680/660/640/620
E680T/660T/640T/620T
E665C/645C
E665CT/645CT
CE4170/4150/4110
CE4200 series
CE5300 series
100
100
90
90
90
100
100
90
125
90
110
90
110
110
unknown
unknown

45nm
Core2 Processors
Solo ULV SU3500/3300
T9900/9800/9600/9550/9500/9400/9300/8300/8100
T6670/6500/6400
T6600
SU9600/9400/9300
SP9600/9400
SL9600/9400/9380/9300
P9700/9600/9500/8800/8700/8600/8400/7570
P7550/7450
100
105
105
90
105
105
105
105
90

45nm
Core2 Quad Processors
Q9100/9000
100

45nm
Core2 Extreme Processors
X9100/9000
QX9300
105
100

45nm
Core i3/i5/i7 Processors
i7 940XM/920
i7 840QM/820/740/720
100
100

45nm
Celeron Processors
SU2300
900
100
105

65nm
Core2 Duo Processors
Solo U2200, U2100
U7700/7600/7500
T7800/7700/7600/7500/7400/7300/7250/7200/7100
T5870/5670/5600/5550/5500/5470/5450/5300/5270
T5250
T5800/5750/5200
L7700/7500/7400/7300/7200
100
100
100
100
100
85
100

65nm
Core2 Extreme Processors
X7900/7800
100

65nm
Core Duo Processors
U2500/2400
T2700/2600/2450/2400/2350/2300E/2300/2250/2050
L2500/2400/2300
100
100
100

65nm
Core Solo Processors
U1500/1400/1300
T1400/1350/1300/1250
100
100

65nm
Xeon Processors 5000 Quad-Core
X5000
E5000
L5000
L5318
90-95
80
70
95

65nm
Xeon Processors 5000 Dual-Core
5080, 5063, 5060, 5050, 5030
5160, 5150, 5148, 5140, 5130, 5120, 5110
L5138
80-90
80
100

65nm
Celeron Processors
T1700/1600
560/550/540/530
100
100
tempX_input	Core temperature (in millidegrees Celsius).
tempX_max	All cooling devices should be turned on (on Core2).
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.
Process	Processor	TjMax(C)
22nm	Core i5/i7 Processors i7 3920XM, 3820QM, 3720QM, 3667U, 3520M i5 3427U, 3360M/3320M i7 3770/3770K i5 3570/3570K, 3550, 3470/3450 i7 3770S i5 3570S/3550S, 3475S/3470S/3450S i7 3770T i5 3570T i5 3470T	105 105 105 105 103 103 94 94 91
32nm	Core i3/i5/i7 Processors i7 2600 i7 660UM/640/620, 640LM/620, 620M, 610E i5 540UM/520/430, 540M/520/450/430 i3 330E, 370M/350/330 i3 330UM	98 105 105 90 rPGA, 105 BGA 105
32nm	Core i7 Extreme Processors 980X	100
32nm	Celeron Processors U3400 P4505/P4500	105 90
32nm	Atom Processors S1260/1220 S1240 Z2460 Z2760 D2700/2550/2500 N2850/2800/2650/2600	95 102 90 90 100 100
45nm	Xeon Processors 5400 Quad-Core X5492, X5482, X5472, X5470, X5460, X5450 E5472, E5462, E5450/40/30/20/10/05 L5408 L5430, L5420, L5410	85 85 95 70
45nm	Xeon Processors 5200 Dual-Core X5282, X5272, X5270, X5260 E5240 E5205, E5220 L5240 L5238, L5215	90 90 70, 90 70 95
45nm	Atom Processors D525/510/425/410 K525/510/425/410 Z670/650 Z560/550/540/530P/530/520PT/520/515/510PT/510P Z510/500 N570/550 N475/470/455/450 N280/270 330/230 E680/660/640/620 E680T/660T/640T/620T E665C/645C E665CT/645CT CE4170/4150/4110 CE4200 series CE5300 series	100 100 90 90 90 100 100 90 125 90 110 90 110 110 unknown unknown
45nm	Core2 Processors Solo ULV SU3500/3300 T9900/9800/9600/9550/9500/9400/9300/8300/8100 T6670/6500/6400 T6600 SU9600/9400/9300 SP9600/9400 SL9600/9400/9380/9300 P9700/9600/9500/8800/8700/8600/8400/7570 P7550/7450	100 105 105 90 105 105 105 105 90
45nm	Core2 Quad Processors Q9100/9000	100
45nm	Core2 Extreme Processors X9100/9000 QX9300	105 100
45nm	Core i3/i5/i7 Processors i7 940XM/920 i7 840QM/820/740/720	100 100
45nm	Celeron Processors SU2300 900	100 105
65nm	Core2 Duo Processors Solo U2200, U2100 U7700/7600/7500 T7800/7700/7600/7500/7400/7300/7250/7200/7100 T5870/5670/5600/5550/5500/5470/5450/5300/5270 T5250 T5800/5750/5200 L7700/7500/7400/7300/7200	100 100 100 100 100 85 100
65nm	Core2 Extreme Processors X7900/7800	100
65nm	Core Duo Processors U2500/2400 T2700/2600/2450/2400/2350/2300E/2300/2250/2050 L2500/2400/2300	100 100 100
65nm	Core Solo Processors U1500/1400/1300 T1400/1350/1300/1250	100 100
65nm	Xeon Processors 5000 Quad-Core X5000 E5000 L5000 L5318	90-95 80 70 95
65nm	Xeon Processors 5000 Dual-Core 5080, 5063, 5060, 5050, 5030 5160, 5150, 5148, 5140, 5130, 5120, 5110 L5138	80-90 80 100
65nm	Celeron Processors T1700/1600 560/550/540/530	100 100