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| <section id="opal-pci-phb-mmio-enable"> |
| <span id="id1"></span><h1>OPAL_PCI_PHB_MMIO_ENABLE<a class="headerlink" href="#opal-pci-phb-mmio-enable" title="Link to this heading">¶</a></h1> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#define OPAL_PCI_PHB_MMIO_ENABLE 27</span> |
| |
| <span class="kt">int64_t</span><span class="w"> </span><span class="nf">opal_pci_phb_mmio_enable</span><span class="p">(</span><span class="kt">uint64_t</span><span class="w"> </span><span class="n">phb_id</span><span class="p">,</span><span class="w"> </span><span class="kt">uint16_t</span><span class="w"> </span><span class="n">window_type</span><span class="p">,</span> |
| <span class="w"> </span><span class="kt">uint16_t</span><span class="w"> </span><span class="n">window_num</span><span class="p">,</span><span class="w"> </span><span class="kt">uint16_t</span><span class="w"> </span><span class="n">enable</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Appears to be POWER7 p7ioc specific. Likely to be removed soon.</p> |
| </div> |
| <p><strong>WARNING:</strong> following documentation is from old sources, and is possibly |
| not representative of OPALv3 as implemented by skiboot. This should be |
| used as a starting point for full documentation.</p> |
| <p>The host calls this function to enable or disable PHB decode of the PCI IO |
| and Memory address spaces below that PHB. Window_num selects an mmio window |
| within that address space. Enable set to ‘1’ enables the PHB to decode and |
| forward system real addresses to PCI memory, while enable set to ‘0’ disables |
| PHB decode and forwarding for the address range defined in a particular MMIO |
| window.</p> |
| <p>Not all PHB hardware may support disabling some or all MMIO windows. OPAL |
| returns <a class="reference internal" href="return-codes.html#opal-unsupported"><span class="std std-ref">OPAL_UNSUPPORTED</span></a> if called to disable an MMIO window for which |
| hardware does not support disable. KVM may call this function for all MMIO |
| windows and ignore the opal_unsuppsorted return code so long as KVM has |
| disabled MMIO to all downstream PCI devices and assured that KVM and OS guest |
| partitions cannot issue CI loads/stores to these address spaces from the |
| processor (e.g.,via HPT).</p> |
| <p>OPAL returns <a class="reference internal" href="return-codes.html#opal-success"><span class="std std-ref">OPAL_SUCCESS</span></a> for calls to OPAL to enable them for PHBs that do |
| not support disable.</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">phb_id</span></code></dt><dd><p>is the value from the PHB node ibm,opal-phbid property.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">window_type</span></code></dt><dd><p>specifies 32-bit or 64-bit PCI memory</p> |
| <p>‘0’ selects PCI IO Space</p> |
| <p>‘1’ selects 32-bit PCI memory space</p> |
| <p>‘2’ selects 64 bit PCI memory space</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">window_num</span></code></dt><dd><p>is the MMIO window number within the specified PCI memory space</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">enable</span></code></dt><dd><p>specifies to enable or disable this MMIO window.</p> |
| </dd> |
| </dl> |
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