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-<table class="head">
- <tr>
- <td class="head-ltitle">MEM(4)</td>
- <td class="head-vol">Device Drivers Manual (hppa)</td>
- <td class="head-rtitle">MEM(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">mem</code>, <code class="Nm">kmem</code> &#x2014;
- <span class="Nd">memory files and memory controller</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">mem* at mainbus0</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">mem</code> driver controls and restricts
- access to the systems memory by the hardware buses and the processor.</p>
-<p class="Pp">It also provides an interface to userland through the special
- files <span class="Pa">/dev/mem</span> and
- <span class="Pa">/dev/kmem</span>. Physical memory is accessed through
- <span class="Pa">/dev/mem</span>, while kernel virtual memory is accessed
- through <span class="Pa">/dev/kmem</span>. Access to kernel virtual
- addresses not currently mapped to memory will fail. On hppa, the physical
- memory range is always contiguous and starts at address 0; kernel virtual
- memory begins at address 0 as well.</p>
-<p class="Pp">The writeability of the <span class="Pa">/dev/mem</span> and
- <span class="Pa">/dev/kmem</span> special files are controlled by the system
- securelevel in addition to the filesystem permissions.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/dev/mem</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt><span class="Pa">/dev/kmem</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">mem</code> driver originates from
- <span class="Ux">OpenBSD</span>. It was ported to <span class="Ux">NetBSD
- 1.6</span> by Matthew Fredette.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">On some systems featuring a &#x201C;Viper&#x201D; memory
- controller, <span class="Ux">NetBSD</span> may not configure bus arbitration
- correctly, causing the boot process to freeze during either
- <code class="Nm">mem</code> or <a class="Xr">hppa/cpu(4)</a> device
- probe.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">February 17, 2017</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>