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<div class="headertitle"><div class="title">consts</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>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;<a class="code" href="l4_2sys_2consts_8h.html">l4/sys/consts.h</a>&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceL4.html">L4</a> {</div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="foldopen" id="foldopen00018" data-start="{" data-end="}">
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"><a class="line" href="namespaceL4.html#a9e6e01651b5cc9d14d8436c6d5d46536"> 18</a></span> <span class="keyword">constexpr</span> T <a class="code hl_function" href="namespaceL4.html#a9e6e01651b5cc9d14d8436c6d5d46536">trunc_order</a>(T val, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> order)</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> {</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="keywordflow">return</span> val &amp; ((~T(0)) &lt;&lt; order);</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> }</div>
</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="foldopen" id="foldopen00032" data-start="{" data-end="}">
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"><a class="line" href="namespaceL4.html#a92c0d3febc3cd6b35aa072d1bf2d9d11"> 32</a></span> <span class="keyword">constexpr</span> T <a class="code hl_function" href="namespaceL4.html#a92c0d3febc3cd6b35aa072d1bf2d9d11">round_order</a>(T val, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> order)</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">return</span> (val + (T(1) &lt;&lt; order) - T(1)) &amp; ((~T(0)) &lt;&lt; order);</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> }</div>
</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">constexpr</span> T trunc_page(T val)</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> {</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceL4.html#a9e6e01651b5cc9d14d8436c6d5d46536">trunc_order</a>(val, <a class="code hl_define" href="group__l4__memory__api.html#gad2f7e71d6265b2735f730dc90c54539a">L4_PAGESHIFT</a>);</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> }</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">constexpr</span> T round_page(T val)</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> {</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceL4.html#a92c0d3febc3cd6b35aa072d1bf2d9d11">round_order</a>(val, <a class="code hl_define" href="group__l4__memory__api.html#gad2f7e71d6265b2735f730dc90c54539a">L4_PAGESHIFT</a>);</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> }</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> max_order(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> order, T addr,</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> T min_addr, T max_addr,</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> T hotspot = T(0))</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> {</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">while</span> (order &lt; 30 <span class="comment">/* limit to 1GB flexpages */</span>)</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> {</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> T mask;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> T base = <a class="code hl_function" href="namespaceL4.html#a9e6e01651b5cc9d14d8436c6d5d46536">trunc_order</a>(addr, order + 1);</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">if</span> (base &lt; min_addr)</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">return</span> order;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">if</span> (base + (T(1) &lt;&lt; (order + 1)) - T(1) &gt; max_addr - T(1))</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">return</span> order;</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> mask = ~((~T(0)) &lt;&lt; (order + 1));</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">if</span> (hotspot == ~T(0) || ((addr ^ hotspot) &amp; mask))</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> ++order;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">return</span> order;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> }</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span>}</div>
<div class="ttc" id="agroup__l4__memory__api_html_gad2f7e71d6265b2735f730dc90c54539a"><div class="ttname"><a href="group__l4__memory__api.html#gad2f7e71d6265b2735f730dc90c54539a">L4_PAGESHIFT</a></div><div class="ttdeci">#define L4_PAGESHIFT</div><div class="ttdoc">Size of a page, log2-based.</div><div class="ttdef"><b>Definition</b> <a href="arm_2l4_2sys_2consts_8h_source.html#l00026">consts.h:26</a></div></div>
<div class="ttc" id="al4_2sys_2consts_8h_html"><div class="ttname"><a href="l4_2sys_2consts_8h.html">consts.h</a></div><div class="ttdoc">Common constants.</div></div>
<div class="ttc" id="anamespaceL4_html"><div class="ttname"><a href="namespaceL4.html">L4</a></div><div class="ttdoc">L4 low-level kernel interface.</div><div class="ttdef"><b>Definition</b> <a href="l4sys-l4f-groups_8dox_source.html#l00050">l4sys-l4f-groups.dox:50</a></div></div>
<div class="ttc" id="anamespaceL4_html_a92c0d3febc3cd6b35aa072d1bf2d9d11"><div class="ttname"><a href="namespaceL4.html#a92c0d3febc3cd6b35aa072d1bf2d9d11">L4::round_order</a></div><div class="ttdeci">constexpr T round_order(T val, unsigned char order)</div><div class="ttdoc">Round a value up so the given number of lsb is zero.</div><div class="ttdef"><b>Definition</b> <a href="#l00032">consts:32</a></div></div>
<div class="ttc" id="anamespaceL4_html_a9e6e01651b5cc9d14d8436c6d5d46536"><div class="ttname"><a href="namespaceL4.html#a9e6e01651b5cc9d14d8436c6d5d46536">L4::trunc_order</a></div><div class="ttdeci">constexpr T trunc_order(T val, unsigned char order)</div><div class="ttdoc">Round a value down so the given number of lsb is zero.</div><div class="ttdef"><b>Definition</b> <a href="#l00018">consts:18</a></div></div>
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