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<div class="headertitle"><div class="title">utils</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// vi:set ft=cpp: -*- Mode: C++ -*-</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (C) 2013 Technische Universität Dresden.</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * License: see LICENSE.spdx (in this directory or the directories above)</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> </div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacecxx.html">cxx</a> {</div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="keyword">template</span>< <span class="keyword">typename</span> T > <span class="keyword">inline</span></div>
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<div class="foldopen" id="foldopen00040" data-start="{" data-end="}">
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="namespacecxx.html#ab148b2c460eb31462ced9a1eafd9667c"> 40</a></span>T <a class="code hl_function" href="namespacecxx.html#ab148b2c460eb31462ced9a1eafd9667c">access_once</a>(T <span class="keyword">const</span> *a)</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span>{</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="preprocessor">#if 1</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> __asm__ __volatile__ ( <span class="stringliteral">""</span> : <span class="stringliteral">"=m"</span>(*<span class="keyword">const_cast<</span>T*<span class="keyword">></span>(a)));</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> T tmp = *a;</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> __asm__ __volatile__ ( <span class="stringliteral">""</span> : <span class="stringliteral">"=m"</span>(*<span class="keyword">const_cast<</span>T*<span class="keyword">></span>(a)));</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keywordflow">return</span> tmp;</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="preprocessor">#else</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> *<span class="keyword">static_cast<</span>T <span class="keyword">const </span><span class="keyword">volatile </span>*<span class="keyword">></span>(a);</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="preprocessor">#endif</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>}</div>
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</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="keyword">template</span>< <span class="keyword">typename</span> T, <span class="keyword">typename</span> VAL > <span class="keyword">inline</span></div>
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<div class="foldopen" id="foldopen00071" data-start="{" data-end="}">
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"><a class="line" href="namespacecxx.html#a7f2e154fabb0f6bc7fe788d6debf4338"> 71</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespacecxx.html#a7f2e154fabb0f6bc7fe788d6debf4338">write_now</a>(T *a, VAL &&val)</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>{</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> __asm__ __volatile__ ( <span class="stringliteral">""</span> : <span class="stringliteral">"=m"</span>(*a));</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> *a = val;</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> __asm__ __volatile__ ( <span class="stringliteral">""</span> : : <span class="stringliteral">"m"</span>(*a));</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span>}</div>
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</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> </div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span>}</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> </div>
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<div class="ttc" id="anamespacecxx_html"><div class="ttname"><a href="namespacecxx.html">cxx</a></div><div class="ttdoc">Our C++ library.</div><div class="ttdef"><b>Definition</b> <a href="arith_source.html#l00011">arith:11</a></div></div>
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<div class="ttc" id="anamespacecxx_html_a7f2e154fabb0f6bc7fe788d6debf4338"><div class="ttname"><a href="namespacecxx.html#a7f2e154fabb0f6bc7fe788d6debf4338">cxx::write_now</a></div><div class="ttdeci">void write_now(T *a, VAL &&val)</div><div class="ttdoc">Write a value at an address exactly once.</div><div class="ttdef"><b>Definition</b> <a href="#l00071">utils:71</a></div></div>
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<div class="ttc" id="anamespacecxx_html_ab148b2c460eb31462ced9a1eafd9667c"><div class="ttname"><a href="namespacecxx.html#ab148b2c460eb31462ced9a1eafd9667c">cxx::access_once</a></div><div class="ttdeci">T access_once(T const *a)</div><div class="ttdoc">Read the value at an address at most once.</div><div class="ttdef"><b>Definition</b> <a href="#l00040">utils:40</a></div></div>
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<li class="navelem"><b>l4</b></li><li class="navelem"><b>cxx</b></li><li class="navelem"><b>utils</b></li>
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<li class="footer">Generated on <span class="timestamp"></span> for L4Re Operating System Framework by <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.15.0 </li>
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