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Diffstat (limited to 'static/freebsd/man4/attimer.4 3.html')
| -rw-r--r-- | static/freebsd/man4/attimer.4 3.html | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/static/freebsd/man4/attimer.4 3.html b/static/freebsd/man4/attimer.4 3.html deleted file mode 100644 index a43f8daf..00000000 --- a/static/freebsd/man4/attimer.4 3.html +++ /dev/null @@ -1,67 +0,0 @@ -<table class="head"> - <tr> - <td class="head-ltitle">ATTIMER(4)</td> - <td class="head-vol">Device Drivers Manual</td> - <td class="head-rtitle">ATTIMER(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">attimer</code> — <span class="Nd">i8254 - Programmable Interval Timer (AT Timer) driver</span></p> -</section> -<section class="Sh"> -<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1> -<p class="Pp">This driver is a mandatory part of x86 kernels.</p> -<p class="Pp">The following tunables are settable from the - <a class="Xr">loader(8)</a>:</p> -<dl class="Bl-ohang"> - <dt id="hint.attimer."><var class="Va">hint.attimer.</var><var class="Ar">X</var><var class="Va">.clock</var></dt> - <dd>controls support for the event timer functionality. Setting this value to - <code class="Dv">0</code> disables it. The default value is - <code class="Dv">1</code>.</dd> - <dt id="hint.attimer.~2"><var class="Va">hint.attimer.</var><var class="Ar">X</var><var class="Va">.timecounter</var></dt> - <dd>controls support for the time counter functionality. Setting this value to - <code class="Dv">0</code> disables it. The default value is - <code class="Dv">1</code>.</dd> - <dt id="hw.i8254.freq"><var class="Va">hw.i8254.freq</var></dt> - <dd>allows overriding the default counter frequency. The same value is also - available at run-time via the <var class="Va">machdep.i8254_freq</var> - sysctl.</dd> -</dl> -</section> -<section class="Sh"> -<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1> -<p class="Pp">This driver uses i8254 Programmable Interval Timer (AT Timer) - hardware to supply the kernel with one timecounter and one event timer, and - to generate sound tones for the system speaker. This hardware includes three - channels. Each channel includes a 16 bit counter which decreases with a - known, platform-dependent frequency. Counters can operate in several - different modes, including periodic and one-shot. The output of each channel - has platform-defined wiring: one channel is wired to the interrupt - controller and may be used as event timer, one channel is wired to the - speaker and used to generate sound tones, and one timer is reserved for - platform purposes.</p> -<p class="Pp">The <code class="Nm">attimer</code> driver uses a single hardware - channel to provide both time counter and event timer functionality. To make - this possible, the respective counter must be running in periodic mode. As a - result, the one-shot event timer mode is supported only when time counter - functionality is disabled.</p> -<p class="Pp">The event timer provided by the driver is irrelevant to CPU power - states.</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">apic(4)</a>, <a class="Xr">atrtc(4)</a>, - <a class="Xr">eventtimers(4)</a>, <a class="Xr">hpet(4)</a>, - <a class="Xr">timecounters(4)</a></p> -</section> -</div> -<table class="foot"> - <tr> - <td class="foot-date">May 26, 2014</td> - <td class="foot-os">FreeBSD 15.0</td> - </tr> -</table> |
