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-<table class="head">
- <tr>
- <td class="head-ltitle">AMDZENTEMP(4)</td>
- <td class="head-vol">Device Drivers Manual (x86)</td>
- <td class="head-rtitle">AMDZENTEMP(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">amdzentemp</code> &#x2014; <span class="Nd">AMD
- Zen CPU family on-die digital thermal sensor</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">amdzentemp* at amdsmnbus?</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">amdzentemp</code> driver provides support for
- the on-die digital thermal sensor present on AMD Ryzen CPUs and some later
- AMD Opteron CPUs.</p>
-<p class="Pp">These sensors provide 0.125&#x00B0;C accuracy. There is one sensor
- for each CPU socket.</p>
-<p class="Pp">The <code class="Nm">amdzentemp</code> driver reports temperatures
- through the <a class="Xr">envsys(4)</a> API.</p>
-<table class="Bl-column Bd-indent">
- <tr id="Sensor">
- <td><a class="permalink" href="#Sensor"><b class="Sy">Sensor</b></a></td>
- <td><a class="permalink" href="#Units"><b class="Sy" id="Units">Units</b></a></td>
- <td><a class="permalink" href="#Typical"><b class="Sy" id="Typical">Typical
- Use</b></a></td>
- </tr>
- <tr>
- <td>CPU<i class="Em">N</i> <span class="No">sensor0</span></td>
- <td>&#x03BC;K</td>
- <td>cpu<i class="Em">N</i> <span class="No">temperature</span></td>
- </tr>
-</table>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">amdtemp(4)</a>, <a class="Xr">envsys(4)</a>,
- <a class="Xr">envstat(8)</a>, <a class="Xr">powerd(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">amdzentemp</code> driver first appeared in
- <span class="Ux">OpenBSD 4.4</span> named &#x201C;kate&#x201D;. It was then
- ported to <span class="Ux">NetBSD 5.0</span> under the name
- <a class="Xr">amdtemp(4)</a>. The <span class="Ux">FreeBSD</span> version of
- the driver was updated with support for newer AMD CPUs. For
- <span class="Ux">NetBSD</span>, the support for the newer CPUs was separated
- into its own <code class="Nm">amdzentemp</code> driver.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">amdzentemp</code> driver was written by
- <span class="An">Constantine A. Murenin</span>
- &lt;<a class="Mt" href="mailto:cnst@openbsd.org">cnst@openbsd.org</a>&gt;
- whilst at the University of Waterloo. Porting of support for the newer AMD
- CPUs from <span class="Ux">FreeBSD</span> was provided by
- <span class="An">Ian Clark</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">The temperature reading provided to <a class="Xr">envsys(4)</a>
- needs to have a CPU-dependent offset applied. For Ryzen X processors, the
- offset is 20&#x00B0;C, while for Threadripper processors an offset of
- 27&#x00B0;C is needed.</p>
-<p class="Pp">The sensor has a thermal-trip value which should be retrieved and
- provided to <a class="Xr">envsys(4)</a> as the sensors critical-maximum
- value.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">April 20, 2020</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>