Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm / 37df003c85efd40b20c6d54695d4f03e6e75ebe6 / . / Documentation / hwmon / coretemp
blob: f85e913a34011525f24d839e5e82aa3c295b552f [file] [log] [blame]
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]1Kernel driver coretemp
2======================
3
4Supported chips:
5 * All Intel Core family
6 Prefix: 'coretemp'
Rudolf Marekeccfed42009-09-23 22:59:42 +0200[diff] [blame]7 CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
8 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
Huaxu Wanfa08acd2009-09-23 22:59:43 +0200[diff] [blame]9 0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield)
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]10 Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
11 Volume 3A: System Programming Guide
Rudolf Marekae770152008-01-18 00:50:04 +0100[diff] [blame]12 http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]13
14Author: Rudolf Marek
15
16Description
17-----------
Durgadoss R199e0de2011-05-20 01:29:35 +0530[diff] [blame]18This driver permits reading the DTS (Digital Temperature Sensor) embedded
19inside Intel CPUs. This driver can read both the per-core and per-package
20temperature using the appropriate sensors. The per-package sensor is new;
21as of now, it is present only in the SandyBridge platform. The driver will
22show the temperature of all cores inside a package under a single device
23directory inside hwmon.
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]24
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]25Temperature is measured in degrees Celsius and measurement resolution is
261 degree C. Valid temperatures are from 0 to TjMax degrees C, because
27the actual value of temperature register is in fact a delta from TjMax.
28
Chen Gongf3cffe42010-08-09 17:21:10 -0700[diff] [blame]29Temperature known as TjMax is the maximum junction temperature of processor,
30which depends on the CPU model. See table below. At this temperature, protection
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]31mechanism will perform actions to forcibly cool down the processor. Alarm
32may be raised, if the temperature grows enough (more than TjMax) to trigger
33the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
34
Durgadoss R199e0de2011-05-20 01:29:35 +0530[diff] [blame]35All Sysfs entries are named with their core_id (represented here by 'X').
36tempX_input - Core temperature (in millidegrees Celsius).
37tempX_max - All cooling devices should be turned on (on Core2).
38tempX_crit - Maximum junction temperature (in millidegrees Celsius).
39tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]40 Correct CPU operation is no longer guaranteed.
Durgadoss R199e0de2011-05-20 01:29:35 +0530[diff] [blame]41tempX_label - Contains string "Core X", where X is processor
42 number. For Package temp, this will be "Physical id Y",
43 where Y is the package number.
Rudolf Marekd58ee052007-05-08 17:22:02 +0200[diff] [blame]44
45The TjMax temperature is set to 85 degrees C if undocumented model specific
46register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as
47(sometimes) documented in processor datasheet.
Chen Gongf3cffe42010-08-09 17:21:10 -0700[diff] [blame]48
49Appendix A. Known TjMax lists (TBD):
50Some information comes from ark.intel.com
51
52Process Processor TjMax(C)
53
5432nm Core i3/i5/i7 Processors
55 i7 660UM/640/620, 640LM/620, 620M, 610E 105
56 i5 540UM/520/430, 540M/520/450/430 105
57 i3 330E, 370M/350/330 90 rPGA, 105 BGA
58 i3 330UM 105
59
6032nm Core i7 Extreme Processors
61 980X 100
62
6332nm Celeron Processors
64 U3400 105
65 P4505/P4500 90
66
6745nm Xeon Processors 5400 Quad-Core
68 X5492, X5482, X5472, X5470, X5460, X5450 85
69 E5472, E5462, E5450/40/30/20/10/05 85
70 L5408 95
71 L5430, L5420, L5410 70
72
7345nm Xeon Processors 5200 Dual-Core
74 X5282, X5272, X5270, X5260 90
75 E5240 90
76 E5205, E5220 70, 90
77 L5240 70
78 L5238, L5215 95
79
8045nm Atom Processors
81 D525/510/425/410 100
82 Z560/550/540/530P/530/520PT/520/515/510PT/510P 90
83 Z510/500 90
84 N475/470/455/450 100
85 N280/270 90
86 330/230 125
87
8845nm Core2 Processors
89 Solo ULV SU3500/3300 100
90 T9900/9800/9600/9550/9500/9400/9300/8300/8100 105
91 T6670/6500/6400 105
92 T6600 90
93 SU9600/9400/9300 105
94 SP9600/9400 105
95 SL9600/9400/9380/9300 105
96 P9700/9600/9500/8800/8700/8600/8400/7570 105
97 P7550/7450 90
98
9945nm Core2 Quad Processors
100 Q9100/9000 100
101
10245nm Core2 Extreme Processors
103 X9100/9000 105
104 QX9300 100
105
10645nm Core i3/i5/i7 Processors
107 i7 940XM/920 100
108 i7 840QM/820/740/720 100
109
11045nm Celeron Processors
111 SU2300 100
112 900 105
113
11465nm Core2 Duo Processors
115 Solo U2200, U2100 100
116 U7700/7600/7500 100
117 T7800/7700/7600/7500/7400/7300/7250/7200/7100 100
118 T5870/5670/5600/5550/5500/5470/5450/5300/5270 100
119 T5250 100
120 T5800/5750/5200 85
121 L7700/7500/7400/7300/7200 100
122
12365nm Core2 Extreme Processors
124 X7900/7800 100
125
12665nm Core Duo Processors
127 U2500/2400 100
128 T2700/2600/2450/2400/2350/2300E/2300/2250/2050 100
129 L2500/2400/2300 100
130
13165nm Core Solo Processors
132 U1500/1400/1300 100
133 T1400/1350/1300/1250 100
134
13565nm Xeon Processors 5000 Quad-Core
136 X5000 90-95
137 E5000 80
138 L5000 70
139 L5318 95
140
14165nm Xeon Processors 5000 Dual-Core
142 5080, 5063, 5060, 5050, 5030 80-90
143 5160, 5150, 5148, 5140, 5130, 5120, 5110 80
144 L5138 100
145
14665nm Celeron Processors
147 T1700/1600 100
148 560/550/540/530 100