From edf053cd7ef3920a156dc92827b3386a2ba2ea56 Mon Sep 17 00:00:00 2001 From: Rudolf Marek Date: Tue, 8 May 2007 17:22:02 +0200 Subject: [PATCH] --- yaml --- r: 55171 b: refs/heads/master c: d58ee056cc40117afe4d3bb03006ac537d779634 h: refs/heads/master i: 55169: 72ee04c335b83fc967fd5c6dca62e0414dec3901 55167: fdc8757eeefeccb9f33ae806769c474612b7788a v: v3 --- [refs] | 2 +- trunk/Documentation/hwmon/coretemp | 36 ++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+), 1 deletion(-) create mode 100644 trunk/Documentation/hwmon/coretemp diff --git a/[refs] b/[refs] index 311026cf052c..550e28c3c47c 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: bebe467823c0d8eeb7f49115c255d8a235a20ddb +refs/heads/master: d58ee056cc40117afe4d3bb03006ac537d779634 diff --git a/trunk/Documentation/hwmon/coretemp b/trunk/Documentation/hwmon/coretemp new file mode 100644 index 000000000000..870cda9416e9 --- /dev/null +++ b/trunk/Documentation/hwmon/coretemp @@ -0,0 +1,36 @@ +Kernel driver coretemp +====================== + +Supported chips: + * All Intel Core family + Prefix: 'coretemp' + CPUID: family 0x6, models 0xe, 0xf + Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual + Volume 3A: System Programming Guide + +Author: Rudolf Marek + +Description +----------- + +This driver permits reading temperature sensor embedded inside Intel Core CPU. +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. +Intel defines this temperature as 85C or 100C. 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: + +temp1_input - Core temperature (in millidegrees Celsius). +temp1_crit - Maximum junction temperature (in millidegrees Celsius). +temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. + Correct CPU operation is no longer guaranteed. +temp1_label - Contains string "Core X", where X is processor + 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.