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-<table class="head">
- <tr>
- <td class="head-ltitle">EST(4)</td>
- <td class="head-vol">Device Drivers Manual (x86)</td>
- <td class="head-rtitle">EST(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">est</code> &#x2014; <span class="Nd">Enhanced
- SpeedStep</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">est0 at cpu0</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">est</code> driver provides support for
- Enhanced SpeedStep introduced in Intel's first and second generation of
- Pentium M processors. The following <a class="Xr">sysctl(8)</a> variables
- are available with <code class="Nm">est</code>:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt id="machdep.cpu.frequency.target"><a class="permalink" href="#machdep.cpu.frequency.target"><code class="Ic">machdep.cpu.frequency.target</code></a></dt>
- <dd>The target frequency of the CPUs.</dd>
- <dt id="machdep.cpu.frequency.current"><a class="permalink" href="#machdep.cpu.frequency.current"><code class="Ic">machdep.cpu.frequency.current</code></a></dt>
- <dd>The current frequency.</dd>
- <dt id="machdep.cpu.frequency.available"><a class="permalink" href="#machdep.cpu.frequency.available"><code class="Ic">machdep.cpu.frequency.available</code></a></dt>
- <dd>The frequencies recognized by <code class="Nm">est</code>.</dd>
-</dl>
-</div>
-<p class="Pp">Note, however, that these variables are not guaranteed to exist in
- the future versions of <span class="Ux">NetBSD</span>.</p>
-</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">acpicpu(4)</a>, <a class="Xr">x86/odcm(4)</a>,
- <a class="Xr">x86/powernow(4)</a></p>
-<p class="Pp"><cite class="Rs"><span class="RsA">Intel Corporation</span>,
- <span class="RsT">Intel Pentium M Processor.</span>,
- <span class="RsT">Datasheet</span>,
- <a class="RsU" href="http://download.intel.com/support/processors/mobile/pm/sb/25261203.pdf">http://download.intel.com/support/processors/mobile/pm/sb/25261203.pdf</a>,
- <span class="RsD">March, 2004</span>.</cite></p>
-<p class="Pp"><cite class="Rs"><span class="RsA">Intel Corporation</span>,
- <span class="RsT">Enhanced Intel SpeedStep Technology for the Intel Pentium
- M Processor.</span>, <span class="RsT">White Paper</span>,
- <a class="RsU" href="http://download.intel.com/design/network/papers/30117401.pdf">http://download.intel.com/design/network/papers/30117401.pdf</a>,
- <span class="RsD">March, 2004</span>.</cite></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
-<p class="Pp">The <code class="Nm">est</code> driver is considered a legacy
- interface to be used only with old systems. It is known to be problematic
- with new CPUs. Furthermore, in the unlikely case where both
- <code class="Nm">est</code> and <a class="Xr">x86/ichlpcib(4)</a> or
- <a class="Xr">piixpcib(4)</a> provide support for SpeedStep, the PCI-based
- interfaces should not be accessed due possible race conditions.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">September 7, 2020</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>