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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 12:07:28 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 12:07:28 -0700 |
commit | 36f021b579d195cdc5fa6f3e2bab198b4bf70643 (patch) | |
tree | 96d3c97f5e5214d2aa7151c12a22a7eb345dbaa1 /Documentation/hwmon/coretemp | |
parent | 215d06780d13fd7de629b02b61b7b7bf88ce5039 (diff) | |
parent | 1d72acf91abb327e25137ad2e371c1a788b34e45 (diff) |
Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6
* 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6: (32 commits)
Use menuconfig objects - hwmon
hwmon/smsc47b397: Use dynamic sysfs callbacks
hwmon/smsc47b397: Convert to a platform driver
hwmon/w83781d: Deprecate W83627HF support
hwmon/w83781d: Use dynamic sysfs callbacks
hwmon/w83781d: Be less i2c_client-centric
hwmon/w83781d: Clean up conversion macros
hwmon/w83781d: No longer use i2c-isa
hwmon/ams: Do not print error on systems without apple motion sensor
hwmon/ams: Fix I2C read retry logic
hwmon: New AD7416, AD7417 and AD7418 driver
hwmon/coretemp: Add documentation
hwmon: New coretemp driver
i386: Use functions from library in msr driver
i386: Add safe variants of rdmsr_on_cpu and wrmsr_on_cpu
hwmon/lm75: Use dynamic sysfs callbacks
hwmon/lm78: Use dynamic sysfs callbacks
hwmon/lm78: Be less i2c_client-centric
hwmon/lm78: No longer use i2c-isa
hwmon: New max6650 driver
...
Diffstat (limited to 'Documentation/hwmon/coretemp')
-rw-r--r-- | Documentation/hwmon/coretemp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp new file mode 100644 index 00000000000..870cda9416e --- /dev/null +++ b/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. |