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-<table class="head">
- <tr>
- <td class="head-ltitle">PMAP_KEXTRACT(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">PMAP_KEXTRACT(9)</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">pmap_kextract</code>,
- <code class="Nm">vtophys</code> &#x2014; <span class="Nd">extract a physical
- address from the kernel page table</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">sys/param.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">vm/vm.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">vm/pmap.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">vm_paddr_t</var>
- <br/>
- <code class="Fn">pmap_kextract</code>(<var class="Fa">vm_offset_t
- va</var>);</p>
-<p class="Pp"><var class="Ft">vm_paddr_t</var>
- <br/>
- <code class="Fn">vtophys</code>(<var class="Fa">vm_offset_t va</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The
- <a class="permalink" href="#pmap_kextract"><code class="Fn" id="pmap_kextract">pmap_kextract</code></a>()
- function retrieves the underlying physical memory address corresponding to
- the given kernel virtual address <var class="Fa">va</var>. The caller is
- responsible for ensuring that <var class="Fa">va</var> belongs to a valid
- mapping in the kernel address space. The returned physical address is only
- meaningful as long as the mapping remains stable, so the caller must also
- have some knowledge or guarantee of the mapping's lifetime. For example, it
- is invalid to call <code class="Fn">pmap_kextract</code>() with the address
- of a malloc'd object while there is a possibility for that object to be
- freed concurrently.</p>
-<p class="Pp" id="pmap_kextract~2">Unlike <a class="Xr">pmap_extract(9)</a>,
- <a class="permalink" href="#pmap_kextract~2"><code class="Fn">pmap_kextract</code></a>()
- is safe to be called from any context; it has no internal locking or
- sleep.</p>
-<p class="Pp" id="vtophys"><a class="permalink" href="#vtophys"><code class="Fn">vtophys</code></a>()
- is an alias for <code class="Fn">pmap_kextract</code>() and behaves
- identically.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
- VALUES</a></h1>
-<p class="Pp">The <code class="Fn">pmap_kextract</code>() function returns the
- physical address of memory mapped at the kernel virtual address
- <var class="Fa">va</var>.</p>
-<p class="Pp"><code class="Fn">pmap_kextract</code>() generally does not fail.
- However, if supplied with an illegitimate value for
- <var class="Fa">va</var>, the function may return zero, an invalid non-zero
- value, or call <a class="Xr">panic(9)</a>.</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">pmap(9)</a>, <a class="Xr">pmap_extract(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manual page was written by <span class="An">Mina
- Gali&#x0107;</span>
- &lt;<a class="Mt" href="mailto:FreeBSD@igalic.co">FreeBSD@igalic.co</a>&gt;,
- based on the <a class="Xr">pmap_extract(9)</a> page written by
- <span class="An">Bruce M Simpson</span>
- &lt;<a class="Mt" href="mailto:bms@spc.org">bms@spc.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">October 16, 2023</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>