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<div id="projectname">libnx<span id="projectnumber"> v4.9.0</span>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_42bea3d40f1f1694e41a8f3166c98108.html">switch</a></li><li class="navelem"><a class="el" href="dir_f3bb171450ae8c98f5225c4eee2b68a5.html">arm</a></li> </ul>
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<div class="headertitle"><div class="title">counter.h</div></div>
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<a href="counter_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/**</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * @file counter.h</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * @brief AArch64 system counter-timer.</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * @author fincs</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * @copyright libnx Authors</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><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include "../types.h"</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"></span> </div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">/**</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> * @brief Gets the current system tick.</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * @return The current system tick.</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> */</span></div>
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<div class="foldopen" id="foldopen00014" data-start="{" data-end="}">
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"><a class="line" href="counter_8h.html#ac3d38b0e7e98e75ea1b24f793bb35236"> 14</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> <a class="code hl_function" href="counter_8h.html#ac3d38b0e7e98e75ea1b24f793bb35236">armGetSystemTick</a>(<span class="keywordtype">void</span>) {</div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> ret;</div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> __asm__ __volatile__ (<span class="stringliteral">"mrs %x[data], cntpct_el0"</span> : [data] <span class="stringliteral">"=r"</span> (ret));</div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span>}</div>
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</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"></span> </div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">/**</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment"> * @brief Gets the system counter-timer frequency</span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"> * @return The system counter-timer frequency, in Hz.</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment"> */</span></div>
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<div class="foldopen" id="foldopen00024" data-start="{" data-end="}">
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="counter_8h.html#a9e8311d2202c31aa9d5dbccdfcbd5805"> 24</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> <a class="code hl_function" href="counter_8h.html#a9e8311d2202c31aa9d5dbccdfcbd5805">armGetSystemTickFreq</a>(<span class="keywordtype">void</span>) {</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> ret;</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> __asm__ (<span class="stringliteral">"mrs %x[data], cntfrq_el0"</span> : [data] <span class="stringliteral">"=r"</span> (ret));</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span>}</div>
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</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment"></span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">/**</span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment"> * @brief Converts from nanoseconds to CPU ticks unit.</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment"> * @param ns Time in nanoseconds.</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment"> * @return Time in CPU ticks.</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment"> */</span></div>
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<div class="foldopen" id="foldopen00035" data-start="{" data-end="}">
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="counter_8h.html#ab61c2ddcfb6ae7daf5b44742fcae9183"> 35</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> <a class="code hl_function" href="counter_8h.html#ab61c2ddcfb6ae7daf5b44742fcae9183">armNsToTicks</a>(<a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> ns) {</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordflow">return</span> (ns * 12) / 625;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>}</div>
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</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment"></span> </div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">/**</span></div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment"> * @brief Converts from CPU ticks unit to nanoseconds.</span></div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment"> * @param tick Time in ticks.</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment"> * @return Time in nanoseconds.</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment"> */</span></div>
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<div class="foldopen" id="foldopen00044" data-start="{" data-end="}">
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="counter_8h.html#acd5d8cf8e5d104333372df2edf61cecd"> 44</a></span><span class="keyword">static</span> <span class="keyword">inline</span> <a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> <a class="code hl_function" href="counter_8h.html#acd5d8cf8e5d104333372df2edf61cecd">armTicksToNs</a>(<a class="code hl_typedef" href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a> tick) {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">return</span> (tick * 625) / 12;</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span>}</div>
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</div>
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<div class="ttc" id="acounter_8h_html_a9e8311d2202c31aa9d5dbccdfcbd5805"><div class="ttname"><a href="counter_8h.html#a9e8311d2202c31aa9d5dbccdfcbd5805">armGetSystemTickFreq</a></div><div class="ttdeci">static u64 armGetSystemTickFreq(void)</div><div class="ttdoc">Gets the system counter-timer frequency.</div><div class="ttdef"><b>Definition</b> counter.h:24</div></div>
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<div class="ttc" id="acounter_8h_html_ab61c2ddcfb6ae7daf5b44742fcae9183"><div class="ttname"><a href="counter_8h.html#ab61c2ddcfb6ae7daf5b44742fcae9183">armNsToTicks</a></div><div class="ttdeci">static u64 armNsToTicks(u64 ns)</div><div class="ttdoc">Converts from nanoseconds to CPU ticks unit.</div><div class="ttdef"><b>Definition</b> counter.h:35</div></div>
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<div class="ttc" id="acounter_8h_html_ac3d38b0e7e98e75ea1b24f793bb35236"><div class="ttname"><a href="counter_8h.html#ac3d38b0e7e98e75ea1b24f793bb35236">armGetSystemTick</a></div><div class="ttdeci">static u64 armGetSystemTick(void)</div><div class="ttdoc">Gets the current system tick.</div><div class="ttdef"><b>Definition</b> counter.h:14</div></div>
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<div class="ttc" id="acounter_8h_html_acd5d8cf8e5d104333372df2edf61cecd"><div class="ttname"><a href="counter_8h.html#acd5d8cf8e5d104333372df2edf61cecd">armTicksToNs</a></div><div class="ttdeci">static u64 armTicksToNs(u64 tick)</div><div class="ttdoc">Converts from CPU ticks unit to nanoseconds.</div><div class="ttdef"><b>Definition</b> counter.h:44</div></div>
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<div class="ttc" id="atypes_8h_html_a3f7e2bcbb0b4c338f3c4f6c937cd4234"><div class="ttname"><a href="types_8h.html#a3f7e2bcbb0b4c338f3c4f6c937cd4234">u64</a></div><div class="ttdeci">uint64_t u64</div><div class="ttdoc">64-bit unsigned integer.</div><div class="ttdef"><b>Definition</b> types.h:22</div></div>
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