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<div class="headertitle"><div class="title">L4::Irq_eoi Class Reference</div></div>
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<p>Interface for sending an unmask message to an object.
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<a href="#details">More...</a></p>
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<p><code>#include <<a class="el" href="irq_source.html">irq</a>></code></p>
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<div id="dynsection-0" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Inheritance diagram for L4::Irq_eoi:</div>
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<div id="dynsection-1" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Collaboration diagram for L4::Irq_eoi:</div>
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<div class="center"><iframe scrolling="no" loading="lazy" frameborder="0" src="classL4_1_1Irq__eoi__coll__graph.svg" width="102" height="76"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-pub-methods" class="groupheader"><a id="pub-methods" name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a2143eb2495d0135bc432efc362845483" id="r_a2143eb2495d0135bc432efc362845483"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structl4__msgtag__t.html">l4_msgtag_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#a2143eb2495d0135bc432efc362845483">unmask</a> (unsigned irqnum, <a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> *label=0, <a class="el" href="unionl4__timeout__t.html">l4_timeout_t</a> to=<a class="el" href="group__l4__timeout__api.html#gaf01c5e1475efc4f33bc7d1985f7320d3">L4_IPC_NEVER</a>, <a class="el" href="group__l4__utcb__api.html#ga89be8a86d11c1d532b636cc2df1330fb">l4_utcb_t</a> *utcb=<a class="el" href="group__l4__utcb__api.html#gadc099b4a59e1d99638c72c11a8c8b644">l4_utcb</a>()) noexcept</td></tr>
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<tr class="memdesc:a2143eb2495d0135bc432efc362845483"><td class="mdescLeft"> </td><td class="mdescRight">Unmask the given interrupt line. <br /></td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Interface for sending an unmask message to an object. </p>
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<p>The object is usually an ICU or an IRQ.</p>
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<p>When the kernel receives an IRQ, it masks the interrupt line at the interrupt controller and immediately acknowledges the interrupt. This interface is used to let the kernel know that userspace has dealt with the IRQ. The kernel will unmask the interrupt line and further IRQs can then be delivered.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="classL4_1_1Icu.html" title="C++ Icu interface, see Interrupt controller for the C interface.">L4::Icu</a>, <a class="el" href="classL4_1_1Irq.html" title="C++ Irq interface, see IRQs for the C interface.">L4::Irq</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="irq_source.html#l00037">37</a> of file <a class="el" href="irq_source.html">irq</a>.</p>
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</div><a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Member Function Documentation</h2>
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<a id="a2143eb2495d0135bc432efc362845483" name="a2143eb2495d0135bc432efc362845483"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a2143eb2495d0135bc432efc362845483">◆ </a></span>unmask()</h2>
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<td class="memname"><a class="el" href="structl4__msgtag__t.html">l4_msgtag_t</a> L4::Irq_eoi::unmask </td>
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<td>(</td>
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<td class="paramtype">unsigned</td> <td class="paramname"><span class="paramname"><em>irqnum</em></span>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="group__l4__basic__types.html#ga1c2c4b333f75b1d05b59855910f2b9cb">l4_umword_t</a> *</td> <td class="paramname"><span class="paramname"><em>label</em></span><span class="paramdefsep"> = </span><span class="paramdefval">0</span>, </td>
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</tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="unionl4__timeout__t.html">l4_timeout_t</a></td> <td class="paramname"><span class="paramname"><em>to</em></span><span class="paramdefsep"> = </span><span class="paramdefval"><a class="el" href="group__l4__timeout__api.html#gaf01c5e1475efc4f33bc7d1985f7320d3">L4_IPC_NEVER</a></span>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="group__l4__utcb__api.html#ga89be8a86d11c1d532b636cc2df1330fb">l4_utcb_t</a> *</td> <td class="paramname"><span class="paramname"><em>utcb</em></span><span class="paramdefsep"> = </span><span class="paramdefval"><a class="el" href="group__l4__utcb__api.html#gadc099b4a59e1d99638c72c11a8c8b644">l4_utcb</a>()</span> )</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel inline">inline</span><span class="mlabel noexcept">noexcept</span></span> </td>
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<p>Unmask the given interrupt line. </p>
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<p>When the object is an IRQ, the given interrupt line is ignored and instead the line which the IRQ is bound to (if any) is unmasked.</p>
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<p>Its counterpart for explicitly masking an interrupt line is <a class="el" href="classL4_1_1Icu.html#ab58aa015a5216a0dece5d85089b42aaa" title="Mask an IRQ line.">L4::Icu::mask()</a>.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir"></td><td class="paramname">irqnum</td><td>The interrupt line that shall be unmasked. Ignored if the object is an IRQ. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">label</td><td>If NULL, this is a send-only unmask. If not NULL, this operation enters an open wait and the <em>protected label</em> shall be received here. </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">to</td><td>The timeout-pair (send and receive) that shall be used for this operation. The receive timeout is used with a non-NULL <span class="tt">label</span> only. </td></tr>
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<tr><td class="paramdir"></td><td class="paramname">utcb</td><td>UTCB to be used for this operation, shall be the UTCB of the calling thread. See <a class="el" href="group__l4__utcb__api.html#gadc099b4a59e1d99638c72c11a8c8b644" title="Get the UTCB address.">l4_utcb</a>.</td></tr>
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</table>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Syscall return tag. If <span class="tt">label</span> is NULL, this function performs an IPC send-only operation and there is no return value except <a class="el" href="group__l4__msgtag__api.html#gga16589e963a73c13aefd2760ce418e053aad1669664171cc979970b1e2300bd463" title="Error indicator flag.">L4_MSGTAG_ERROR</a> indicating success or failure of the send operation. In this case use <a class="el" href="group__l4__ipc__err__api.html#gad40f404217497793e95a10d77a47db39" title="Get the IPC error code for an IPC operation.">l4_ipc_error()</a> to check for errors and <b>do not</b> use <a class="el" href="group__l4__ipc__err__api.html#ga05c11e3e10b6c2aa941396ac2018899f" title="Get IPC error code if any or message tag label otherwise for an IPC call.">l4_error()</a>. </dd></dl>
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<p class="definition">Definition at line <a class="el" href="irq_source.html#l00064">64</a> of file <a class="el" href="irq_source.html">irq</a>.</p>
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<p class="reference">References <a class="el" href="kobject_source.html#l00069">L4::Kobject::cap()</a>, and <a class="el" href="____timeout_8h_source.html#l00076">L4_IPC_NEVER</a>.</p>
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<div id="dynsection-2" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Here is the call graph for this function:</div>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li>l4/sys/<a class="el" href="irq_source.html">irq</a></li>
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