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 103
 104 <div class="header">
 105   <div class="headertitle"><div class="title">rand.h</div></div>
 106 </div><!--header-->
 107 <div class="contents">
 108 <a href="rand_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>
 109 <div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.</span></div>
 110 <div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
 111 <div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * SPDX-License-Identifier: BSD-3-Clause</span></div>
 112 <div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> */</span></div>
 113 <div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span> </div>
 114 <div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="preprocessor">#ifndef _PICO_RAND_H</span></div>
 115 <div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="preprocessor">#define _PICO_RAND_H</span></div>
 116 <div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span> </div>
 117 <div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="preprocessor">#include &quot;<a class="code" href="pico_8h.html">pico.h</a>&quot;</span></div>
 118 <div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span> </div>
 119 <div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="preprocessor">#ifdef __cplusplus</span></div>
 120 <div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {</div>
 121 <div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="preprocessor">#endif</span></div>
 122 <div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span> </div>
 123 <div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">// ---------------</span></div>
 124 <div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">// ENTROPY SOURCES</span></div>
 125 <div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">// ---------------</span></div>
 126 <div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span> </div>
 127 <div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">// PICO_CONFIG: PICO_RAND_ENTROPY_SRC_ROSC, Enable/disable use of ROSC as an entropy source, type=bool, default=1, group=pico_rand</span></div>
 128 <div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="preprocessor">#ifndef PICO_RAND_ENTROPY_SRC_ROSC</span></div>
 129 <div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="preprocessor">#define PICO_RAND_ENTROPY_SRC_ROSC 1</span></div>
 130 <div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="preprocessor">#endif</span></div>
 131 <div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span> </div>
 132 <div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">// PICO_CONFIG: PICO_RAND_ENTROPY_SRC_TIME, Enable/disable use of hardware timestamp as an entropy source, type=bool, default=1, group=pico_rand</span></div>
 133 <div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="preprocessor">#ifndef PICO_RAND_ENTROPY_SRC_TIME</span></div>
 134 <div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="preprocessor">#define PICO_RAND_ENTROPY_SRC_TIME 1</span></div>
 135 <div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="preprocessor">#endif</span></div>
 136 <div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span> </div>
 137 <div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment">// PICO_CONFIG: PICO_RAND_ENTROPY_SRC_BUS_PERF_COUNTER, Enable/disable use of a bus performance counter as an entropy source, type=bool, default=1, group=pico_rand</span></div>
 138 <div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="preprocessor">#ifndef PICO_RAND_ENTROPY_SRC_BUS_PERF_COUNTER</span></div>
 139 <div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="preprocessor">#define PICO_RAND_ENTROPY_SRC_BUS_PERF_COUNTER 1</span></div>
 140 <div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="preprocessor">#endif</span></div>
 141 <div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span> </div>
 142 <div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment">// --------------------</span></div>
 143 <div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment">// SEED ENTROPY SOURCES</span></div>
 144 <div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment">// --------------------</span></div>
 145 <div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span> </div>
 146 <div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">// PICO_CONFIG: PICO_RAND_SEED_ENTROPY_SRC_ROSC, Enable/disable use of ROSC as an entropy source for the random seed, type=bool, default=1, group=pico_rand</span></div>
 147 <div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="preprocessor">#ifndef PICO_RAND_SEED_ENTROPY_SRC_ROSC</span></div>
 148 <div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="preprocessor">#define PICO_RAND_SEED_ENTROPY_SRC_ROSC PICO_RAND_ENTROPY_SRC_ROSC</span></div>
 149 <div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="preprocessor">#endif</span></div>
 150 <div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span> </div>
 151 <div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment">// PICO_CONFIG: PICO_RAND_SEED_ENTROPY_SRC_TIME, Enable/disable use of hardware timestamp as an entropy source for the random seed, type=bool, default=1, group=pico_rand</span></div>
 152 <div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="preprocessor">#ifndef PICO_RAND_SEED_ENTROPY_SRC_TIME</span></div>
 153 <div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="preprocessor">#define PICO_RAND_SEED_ENTROPY_SRC_TIME PICO_RAND_ENTROPY_SRC_TIME</span></div>
 154 <div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="preprocessor">#endif</span></div>
 155 <div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span> </div>
 156 <div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment">// PICO_CONFIG: PICO_RAND_SEED_ENTROPY_SRC_BOARD_ID, Enable/disable use of board id as part of the random seed, type=bool, default=1, group=pico_rand</span></div>
 157 <div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="preprocessor">#ifndef PICO_RAND_SEED_ENTROPY_SRC_BOARD_ID</span></div>
 158 <div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="preprocessor">#define PICO_RAND_SEED_ENTROPY_SRC_BOARD_ID 1</span></div>
 159 <div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="preprocessor">#endif</span></div>
 160 <div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span> </div>
 161 <div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">// PICO_CONFIG: PICO_RAND_SEED_ENTROPY_SRC_RAM_HASH, Enable/disable use of a RAM hash as an entropy source for the random seed, type=bool, default=1, group=pico_rand</span></div>
 162 <div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="preprocessor">#ifndef PICO_RAND_SEED_ENTROPY_SRC_RAM_HASH</span></div>
 163 <div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="preprocessor">#define PICO_RAND_SEED_ENTROPY_SRC_RAM_HASH 1</span></div>
 164 <div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="preprocessor">#endif</span></div>
 165 <div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span> </div>
 166 <div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">// ---------------------------------</span></div>
 167 <div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">// PICO_RAND_ENTROPY_SRC_ROSC CONFIG</span></div>
 168 <div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">// ---------------------------------</span></div>
 169 <div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span> </div>
 170 <div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">// PICO_CONFIG: PICO_RAND_ROSC_BIT_SAMPLE_COUNT, Number of samples to take of the ROSC random bit per random number generation , min=1, max=64, default=1, group=pico_rand</span></div>
 171 <div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="preprocessor">#ifndef PICO_RAND_ROSC_BIT_SAMPLE_COUNT</span></div>
 172 <div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="preprocessor">#define PICO_RAND_ROSC_BIT_SAMPLE_COUNT 1</span></div>
 173 <div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="preprocessor">#endif</span></div>
 174 <div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span> </div>
 175 <div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">// PICO_CONFIG: PICO_RAND_MIN_ROSC_BIT_SAMPLE_TIME_US, Define a default minimum time between sampling the ROSC random bit, min=5, max=20, default=10, group=pico_rand</span></div>
 176 <div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="preprocessor">#ifndef PICO_RAND_MIN_ROSC_BIT_SAMPLE_TIME_US</span></div>
 177 <div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">// (Arbitrary / tested) minimum time between sampling the ROSC random bit</span></div>
 178 <div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="preprocessor">#define PICO_RAND_MIN_ROSC_BIT_SAMPLE_TIME_US 10u</span></div>
 179 <div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="preprocessor">#endif</span></div>
 180 <div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span> </div>
 181 <div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">// ---------------------------------------------</span></div>
 182 <div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">// PICO_RAND_ENTROPY_SRC_BUS_PERF_COUNTER CONFIG</span></div>
 183 <div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">// ---------------------------------------------</span></div>
 184 <div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span> </div>
 185 <div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">// PICO_CONFIG: PICO_RAND_BUS_PERF_COUNTER_INDEX, Bus performance counter index to use for sourcing entropy, min=0, max=3, group=pico_rand</span></div>
 186 <div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">// this is deliberately undefined by default, meaning the code will pick that appears unused</span></div>
 187 <div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">//#define PICO_RAND_BUS_PERF_COUNTER_INDEX 0</span></div>
 188 <div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span> </div>
 189 <div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">// PICO_CONFIG: PICO_RAND_BUS_PERF_COUNTER_EVENT, Bus performance counter event to use for sourcing entropy, default=arbiter_sram5_perf_event_access, group=pico_rand</span></div>
 190 <div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="preprocessor">#ifndef PICO_RAND_BUS_PERF_COUNTER_EVENT</span></div>
 191 <div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="preprocessor">#define PICO_RAND_BUS_PERF_COUNTER_EVENT arbiter_sram5_perf_event_access</span></div>
 192 <div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="preprocessor">#endif</span></div>
 193 <div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span> </div>
 194 <div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">// ------------------------------------------</span></div>
 195 <div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">// PICO_RAND_SEED_ENTROPY_SRC_RAM_HASH CONFIG</span></div>
 196 <div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">// ------------------------------------------</span></div>
 197 <div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span> </div>
 198 <div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">// PICO_CONFIG: PICO_RAND_RAM_HASH_END, end of address in RAM (non-inclusive) to hash during pico_rand seed initialization, default=SRAM_END, group=pico_rand</span></div>
 199 <div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="preprocessor">#ifndef PICO_RAND_RAM_HASH_END</span></div>
 200 <div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="preprocessor">#define PICO_RAND_RAM_HASH_END     SRAM_END</span></div>
 201 <div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="preprocessor">#endif</span></div>
 202 <div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">// PICO_CONFIG: PICO_RAND_RAM_HASH_START, start of address in RAM (inclusive) to hash during pico_rand seed initialization, default=PICO_RAND_RAM_HASH_END - 1024, group=pico_rand</span></div>
 203 <div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="preprocessor">#ifndef PICO_RAND_RAM_HASH_START</span></div>
 204 <div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="preprocessor">#define PICO_RAND_RAM_HASH_START   (PICO_RAND_RAM_HASH_END - 1024u)</span></div>
 205 <div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="preprocessor">#endif</span></div>
 206 <div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span> </div>
 207 <div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">// We provide a maximum of 128 bits entropy in one go</span></div>
 208 <div class="line"><a id="l00147" name="l00147"></a><span class="lineno"><a class="line" href="structrng__128.html">  147</a></span><span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code hl_struct" href="structrng__128.html">rng_128</a> {</div>
 209 <div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>    uint64_t r[2];</div>
 210 <div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>} <a class="code hl_struct" href="structrng__128.html">rng_128_t</a>;</div>
 211 <div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span> </div>
 212 <div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="keywordtype">void</span> <a class="code hl_function" href="group__pico__rand.html#ga97a9544b527a3ba865ab70142bdd5d1b">get_rand_128</a>(<a class="code hl_struct" href="structrng__128.html">rng_128_t</a> *rand128);</div>
 213 <div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span> </div>
 214 <div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>uint64_t <a class="code hl_function" href="group__pico__rand.html#ga783185fba81c03eb0c1d687d322b0112">get_rand_64</a>(<span class="keywordtype">void</span>);</div>
 215 <div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span> </div>
 216 <div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>uint32_t <a class="code hl_function" href="group__pico__rand.html#gac446d739bd6818ee25b5c8644ef7c8e8">get_rand_32</a>(<span class="keywordtype">void</span>);</div>
 217 <div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span> </div>
 218 <div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="preprocessor">#ifdef __cplusplus</span></div>
 219 <div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>}</div>
 220 <div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="preprocessor">#endif</span></div>
 221 <div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span> </div>
 222 <div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="preprocessor">#endif</span></div>
 223 <div class="ttc" id="agroup__pico__rand_html_ga783185fba81c03eb0c1d687d322b0112"><div class="ttname"><a href="group__pico__rand.html#ga783185fba81c03eb0c1d687d322b0112">get_rand_64</a></div><div class="ttdeci">uint64_t get_rand_64(void)</div><div class="ttdoc">Get 64-bit random number.</div><div class="ttdef"><b>Definition:</b> rand.c:247</div></div>
 224 <div class="ttc" id="agroup__pico__rand_html_ga97a9544b527a3ba865ab70142bdd5d1b"><div class="ttname"><a href="group__pico__rand.html#ga97a9544b527a3ba865ab70142bdd5d1b">get_rand_128</a></div><div class="ttdeci">void get_rand_128(rng_128_t *rand128)</div><div class="ttdoc">Get 128-bit random number.</div><div class="ttdef"><b>Definition:</b> rand.c:296</div></div>
 225 <div class="ttc" id="agroup__pico__rand_html_gac446d739bd6818ee25b5c8644ef7c8e8"><div class="ttname"><a href="group__pico__rand.html#gac446d739bd6818ee25b5c8644ef7c8e8">get_rand_32</a></div><div class="ttdeci">uint32_t get_rand_32(void)</div><div class="ttdoc">Get 32-bit random number.</div><div class="ttdef"><b>Definition:</b> rand.c:301</div></div>
 226 <div class="ttc" id="apico_8h_html"><div class="ttname"><a href="pico_8h.html">pico.h</a></div></div>
 227 <div class="ttc" id="astructrng__128_html"><div class="ttname"><a href="structrng__128.html">rng_128</a></div><div class="ttdef"><b>Definition:</b> rand.h:147</div></div>
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