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-<table class="head">
- <tr>
- <td class="head-ltitle">EFIDEV(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">EFIDEV(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">efidev</code>, <code class="Nm">efirtc</code>
- &#x2014; <span class="Nd">user-mode access to UEFI runtime
- services</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following lines
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">options EFIRT</code></div>
-<p class="Pp">Alternatively, to load the driver as a module at boot time, place
- the following line in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>efirt_load=&quot;YES&quot;</pre>
-</div>
-<p class="Pp">The driver may be disabled by setting the
- <a class="Xr">loader(8)</a> tunable <var class="Va">efi.rt.disabled</var> to
- &#x201C;<code class="Li">1</code>&#x201D;.</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">efidev</code> device provides user-mode
- access to UEFI runtime services. <code class="Nm">efidev</code> also
- includes a driver to provide a time-of-day clock using the UEFI real time
- clock (RTC). However, the RTC may not always be available, based on the UEFI
- firmware. If the RTC is not available, it will not be registered as a
- time-of-day clock and the time related ioctls below will not be
- functional.</p>
-<p class="Pp"><code class="Nm">efidev</code> provides the following ioctls
- defined in <code class="In">&lt;<a class="In">sys/efiio.h</a>&gt;</code>
- with supplemental structures and constants defined in
- <code class="In">&lt;<a class="In">sys/efi.h</a>&gt;</code>:</p>
-<dl class="Bl-tag">
- <dt id="EFIIOC_GET_TABLE"><a class="permalink" href="#EFIIOC_GET_TABLE"><code class="Dv">EFIIOC_GET_TABLE</code></a>
- (<var class="Vt">struct efi_get_table_ioc</var>)</dt>
- <dd>Copy the UEFI table specified by the <var class="Va">uuid</var> field of
- the <var class="Vt">struct efi_get_table_ioc</var> into the
- <var class="Va">buf</var> field. The memory size for the buf field can be
- queried by passing <code class="Dv">NULL</code> pointer as a buf value.
- The required size will be stored in the <var class="Va">table_len</var>
- field. The size of the allocated memory must be specified in the
- <var class="Va">buf_len</var> field.
- <div class="Bd Pp Bd-indent Li">
- <pre>struct efi_get_table_ioc {
- void *buf;
- struct uuid uuid;
- size_t table_len;
- size_t buf_len;
-};</pre>
- </div>
- </dd>
- <dt id="EFIIOC_GET_TIME"><a class="permalink" href="#EFIIOC_GET_TIME"><code class="Dv">EFIIOC_GET_TIME</code></a>
- (<var class="Vt">struct efi_tm</var>)</dt>
- <dd>Get the time from the RTC, if the RTC is available. The
- <var class="Vt">struct efi_tm</var> passed is populated with the current
- time, unless an error occurs.
- <div class="Bd Pp Bd-indent Li">
- <pre>struct efi_tm {
- uint16_t tm_year;
- uint8_t tm_mon
- uint8_t tm_mday
- uint8_t tm_hour;
- uint8_t tm_min;
- uint8_t tm_sec;
- uint8_t __pad1;
- uint32_t tm_nsec;
- int16_t tm_tz;
- uint8_t tm_dst;
- uint8_t __pad2;
-};</pre>
- </div>
- </dd>
- <dt id="EFIIOC_SET_TIME"><a class="permalink" href="#EFIIOC_SET_TIME"><code class="Dv">EFIIOC_SET_TIME</code></a>
- (<var class="Vt">struct efi_tm</var>)</dt>
- <dd>Sets the time stored by the RTC, if the RTC is available.</dd>
- <dt id="EFIIOC_VAR_GET"><a class="permalink" href="#EFIIOC_VAR_GET"><code class="Dv">EFIIOC_VAR_GET</code></a>
- (<var class="Vt">struct efi_var_ioc</var>)</dt>
- <dd>Gets data from the variable described by the vendor and name fields of the
- <var class="Vt">struct efi_var_ioc</var> into the
- <var class="Fa">data</var> field. <code class="Dv">EFIIOC_VAR_GET</code>
- (<var class="Vt">struct efi_var_ioc</var>) will also populate the
- <var class="Fa">attrib</var> field.
- <div class="Bd Pp Li">
- <pre>struct efi_var_ioc {
- efi_char *name;
- size_t namesize;
- struct uuid vendor;
- uint32_t attrib;
- void *data;
- size_t datasize;
-};</pre>
- </div>
- </dd>
- <dt id="EFIIOC_VAR_NEXT"><a class="permalink" href="#EFIIOC_VAR_NEXT"><code class="Dv">EFIIOC_VAR_NEXT</code></a>
- (<var class="Vt">struct efi_var_ioc</var>)</dt>
- <dd>Used for enumerating all UEFI variables. The initial call should use an
- empty string for the name attribute. Subsequent calls should supply the
- vendor uuid and name of the last variable returned.</dd>
- <dt id="EFIIOC_VAR_SET"><a class="permalink" href="#EFIIOC_VAR_SET"><code class="Dv">EFIIOC_VAR_SET</code></a>
- (<var class="Vt">struct efi_var_ioc</var>)</dt>
- <dd>Sets data and attributes for the variable described by the name and vendor
- in the <var class="Vt">struct efi_var_ioc</var>.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag">
- <dt><span class="Pa">/dev/efi</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
-</dl>
-</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">efivar(3)</a>, <a class="Xr">efirt(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">A <code class="Nm">efidev</code> device first appeared in
- <span class="Ux">FreeBSD 11.1</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp"><code class="Nm">efidev</code> is currently only available on
- amd64 and arm64.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 18, 2021</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>