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<section id="elf-note-powerpc-namespace">
<h1>ELF Note PowerPC Namespace<a class="headerlink" href="#elf-note-powerpc-namespace" title="Link to this heading">¶</a></h1>
<p>The PowerPC namespace in an ELF Note of the kernel binary is used to store
capabilities and information which can be used by a bootloader or userland.</p>
<section id="types-and-descriptors">
<h2>Types and Descriptors<a class="headerlink" href="#types-and-descriptors" title="Link to this heading">¶</a></h2>
<p>The types to be used with the “PowerPC” namespace are defined in <a class="footnote-reference brackets" href="#f1" id="id1" role="doc-noteref"><span class="fn-bracket">[</span>1<span class="fn-bracket">]</span></a>.</p>
<blockquote>
<div><ol class="arabic simple">
<li><p>PPC_ELFNOTE_CAPABILITIES</p></li>
</ol>
</div></blockquote>
<p>Define the capabilities supported/required by the kernel. This type uses a
bitmap as “descriptor” field. Each bit is described below:</p>
<ul class="simple">
<li><p>Ultravisor-capable bit (PowerNV only).</p></li>
</ul>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#define PPCCAP_ULTRAVISOR_BIT (1 << 0)</span>
</pre></div>
</div>
<p>Indicate that the powerpc kernel binary knows how to run in an
ultravisor-enabled system.</p>
<p>In an ultravisor-enabled system, some machine resources are now controlled
by the ultravisor. If the kernel is not ultravisor-capable, but it ends up
being run on a machine with ultravisor, the kernel will probably crash
trying to access ultravisor resources. For instance, it may crash in early
boot trying to set the partition table entry 0.</p>
<p>In an ultravisor-enabled system, a bootloader could warn the user or prevent
the kernel from being run if the PowerPC ultravisor capability doesn’t exist
or the Ultravisor-capable bit is not set.</p>
</section>
<section id="references">
<h2>References<a class="headerlink" href="#references" title="Link to this heading">¶</a></h2>
<aside class="footnote-list brackets">
<aside class="footnote brackets" id="f1" role="doc-footnote">
<span class="label"><span class="fn-bracket">[</span><a role="doc-backlink" href="#id1">1</a><span class="fn-bracket">]</span></span>
<p>arch/powerpc/include/asm/elfnote.h</p>
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