1Kernel driver coretemp
  2======================
  3
  4Supported chips:
  5  * All Intel Core family
  6    Prefix: 'coretemp'
  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), 0x1e (Lynnfield),
 10                              0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
 11                              0x36 (Cedar Trail Atom)
 12    Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
 13               Volume 3A: System Programming Guide
 14               http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
 15
 16Author: Rudolf Marek
 17
 18Description
 19-----------
 20This driver permits reading the DTS (Digital Temperature Sensor) embedded
 21inside Intel CPUs. This driver can read both the per-core and per-package
 22temperature using the appropriate sensors. The per-package sensor is new;
 23as of now, it is present only in the SandyBridge platform. The driver will
 24show the temperature of all cores inside a package under a single device
 25directory inside hwmon.
 26
 27Temperature is measured in degrees Celsius and measurement resolution is
 281 degree C. Valid temperatures are from 0 to TjMax degrees C, because
 29the actual value of temperature register is in fact a delta from TjMax.
 30
 31Temperature known as TjMax is the maximum junction temperature of processor,
 32which depends on the CPU model. See table below. At this temperature, protection
 33mechanism will perform actions to forcibly cool down the processor. Alarm
 34may be raised, if the temperature grows enough (more than TjMax) to trigger
 35the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 36
 37All Sysfs entries are named with their core_id (represented here by 'X').
 38tempX_input	 - Core temperature (in millidegrees Celsius).
 39tempX_max	 - All cooling devices should be turned on (on Core2).
 40tempX_crit	 - Maximum junction temperature (in millidegrees Celsius).
 41tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
 42		   Correct CPU operation is no longer guaranteed.
 43tempX_label	 - Contains string "Core X", where X is processor
 44		   number. For Package temp, this will be "Physical id Y",
 45		   where Y is the package number.
 46
 47On CPU models which support it, TjMax is read from a model-specific register.
 48On other models, it is set to an arbitrary value based on weak heuristics.
 49If these heuristics don't work for you, you can pass the correct TjMax value
 50as a module parameter (tjmax).
 51
 52Appendix A. Known TjMax lists (TBD):
 53Some information comes from ark.intel.com
 54
 55Process		Processor					TjMax(C)
 56
 5722nm		Core i5/i7 Processors
 58		i7 3920XM, 3820QM, 3720QM, 3667U, 3520M		105
 59		i5 3427U, 3360M/3320M				105
 60		i7 3770/3770K					105
 61		i5 3570/3570K, 3550, 3470/3450			105
 62		i7 3770S					103
 63		i5 3570S/3550S, 3475S/3470S/3450S		103
 64		i7 3770T					94
 65		i5 3570T					94
 66		i5 3470T					91
 67
 6832nm		Core i3/i5/i7 Processors
 69		i7 660UM/640/620, 640LM/620, 620M, 610E		105
 70		i5 540UM/520/430, 540M/520/450/430		105
 71		i3 330E, 370M/350/330				90 rPGA, 105 BGA
 72		i3 330UM					105
 73
 7432nm		Core i7 Extreme Processors
 75		980X						100
 76
 7732nm		Celeron Processors
 78		U3400						105
 79		P4505/P4500 					90
 80
 8132nm		Atom Processors
 82		Z2460						90
 83		D2700/2550/2500					100
 84		N2850/2800/2650/2600				100
 85
 8645nm		Xeon Processors 5400 Quad-Core
 87		X5492, X5482, X5472, X5470, X5460, X5450	85
 88		E5472, E5462, E5450/40/30/20/10/05		85
 89		L5408						95
 90		L5430, L5420, L5410				70
 91
 9245nm		Xeon Processors 5200 Dual-Core
 93		X5282, X5272, X5270, X5260			90
 94		E5240						90
 95		E5205, E5220					70, 90
 96		L5240						70
 97		L5238, L5215					95
 98
 9945nm		Atom Processors
100		D525/510/425/410				100
101		Z560/550/540/530P/530/520PT/520/515/510PT/510P	90
102		Z510/500					90
103		N475/470/455/450				100
104		N280/270					90
105		330/230						125
106		E680/660/640/620				90
107		E680T/660T/640T/620T				110
108
10945nm		Core2 Processors
110		Solo ULV SU3500/3300				100
111		T9900/9800/9600/9550/9500/9400/9300/8300/8100	105
112		T6670/6500/6400					105
113		T6600						90
114		SU9600/9400/9300				105
115		SP9600/9400					105
116		SL9600/9400/9380/9300				105
117		P9700/9600/9500/8800/8700/8600/8400/7570	105
118		P7550/7450					90
119
12045nm		Core2 Quad Processors
121		Q9100/9000					100
122
12345nm		Core2 Extreme Processors
124		X9100/9000					105
125		QX9300						100
126
12745nm		Core i3/i5/i7 Processors
128		i7 940XM/920					100
129		i7 840QM/820/740/720				100
130
13145nm		Celeron Processors
132		SU2300						100
133		900 						105
134
13565nm		Core2 Duo Processors
136		Solo U2200, U2100				100
137		U7700/7600/7500					100
138		T7800/7700/7600/7500/7400/7300/7250/7200/7100	100
139		T5870/5670/5600/5550/5500/5470/5450/5300/5270	100
140		T5250						100
141		T5800/5750/5200					85
142		L7700/7500/7400/7300/7200			100
143
14465nm		Core2 Extreme Processors
145		X7900/7800					100
146
14765nm		Core Duo Processors
148		U2500/2400					100
149		T2700/2600/2450/2400/2350/2300E/2300/2250/2050	100
150		L2500/2400/2300					100
151
15265nm		Core Solo Processors
153		U1500/1400/1300					100
154		T1400/1350/1300/1250				100
155
15665nm		Xeon Processors 5000 Quad-Core
157		X5000						90-95
158		E5000						80
159		L5000						70
160		L5318						95
161
16265nm		Xeon Processors 5000 Dual-Core
163		5080, 5063, 5060, 5050, 5030			80-90
164		5160, 5150, 5148, 5140, 5130, 5120, 5110	80
165		L5138						100
166
16765nm		Celeron Processors
168		T1700/1600					100
169		560/550/540/530					100