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| <section id="starting-and-stopping-secondary-cpus"> |
| <h1>Starting and stopping secondary CPUs<a class="headerlink" href="#starting-and-stopping-secondary-cpus" title="Link to this heading">¶</a></h1> |
| <p>In this context, each thread is a CPU. That is, you start and stop threads of |
| CPUs.</p> |
| <section id="opal-start-cpu"> |
| <span id="id1"></span><h2>OPAL_START_CPU<a class="headerlink" href="#opal-start-cpu" title="Link to this heading">¶</a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#define OPAL_START_CPU 41</span> |
| |
| <span class="kt">int64_t</span><span class="w"> </span><span class="nf">opal_start_cpu_thread</span><span class="p">(</span><span class="kt">uint64_t</span><span class="w"> </span><span class="n">server_no</span><span class="p">,</span><span class="w"> </span><span class="kt">uint64_t</span><span class="w"> </span><span class="n">start_address</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <section id="returns"> |
| <h3>Returns<a class="headerlink" href="#returns" title="Link to this heading">¶</a></h3> |
| <dl class="simple"> |
| <dt><a class="reference internal" href="return-codes.html#opal-success"><span class="std std-ref">OPAL_SUCCESS</span></a></dt><dd><p>The CPU was instructed to start executing instructions from the specified |
| <cite>start_address</cite>. |
| This is an <em>asynchronous</em> operation, so it may take a short period of |
| time before the CPU actually starts at that address.</p> |
| </dd> |
| <dt><a class="reference internal" href="return-codes.html#opal-parameter"><span class="std std-ref">OPAL_PARAMETER</span></a></dt><dd><p>Invalid CPU.</p> |
| </dd> |
| <dt><a class="reference internal" href="return-codes.html#opal-wrong-state"><span class="std std-ref">OPAL_WRONG_STATE</span></a></dt><dd><p>If the CPU thread is not in OPAL, or is being re-initialized through <a class="reference internal" href="opal-reinit-cpus-70.html#opal-reinit-cpus"><span class="std std-ref">OPAL_REINIT_CPUS</span></a></p> |
| </dd> |
| <dt><a class="reference internal" href="return-codes.html#opal-internal-error"><span class="std std-ref">OPAL_INTERNAL_ERROR</span></a></dt><dd><p>Something else went horribly wrong.</p> |
| </dd> |
| </dl> |
| </section> |
| </section> |
| <section id="opal-return-cpu"> |
| <span id="id2"></span><h2>OPAL_RETURN_CPU<a class="headerlink" href="#opal-return-cpu" title="Link to this heading">¶</a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#define OPAL_RETURN_CPU 69</span> |
| |
| <span class="kt">int64_t</span><span class="w"> </span><span class="nf">opal_return_cpu</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>When OPAL first starts the host, all secondary CPUs are spinning in OPAL. |
| To start them, one must call OPAL_START_CPU (you may want to OPAL_REINIT_CPUS |
| to set the HILE bit first).</p> |
| <p>In cases where you need OPAL to do something for you across all CPUs, such |
| as OPAL_REINIT_CPUS, (on some platforms) a firmware update or get the machine |
| back into a similar state as to when the host OS was started (e.g. for kexec) |
| you may also need to return control of the CPU to OPAL.</p> |
| <section id="id3"> |
| <h3>Returns<a class="headerlink" href="#id3" title="Link to this heading">¶</a></h3> |
| <p>This call does <strong>not return</strong>. You need to OPAL_START_CPU.</p> |
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| <h3><a href="../index.html">Table of Contents</a></h3> |
| <ul> |
| <li><a class="reference internal" href="#">Starting and stopping secondary CPUs</a><ul> |
| <li><a class="reference internal" href="#opal-start-cpu">OPAL_START_CPU</a><ul> |
| <li><a class="reference internal" href="#returns">Returns</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#opal-return-cpu">OPAL_RETURN_CPU</a><ul> |
| <li><a class="reference internal" href="#id3">Returns</a></li> |
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