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<div class="title">start.S</div>  </div>
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<a href="init_2start_8S.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;/*-</div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; * Copyright (c) 2002-2018 The UbixOS Project.</div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160; * All rights reserved.</div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160; *</div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160; * This was developed by Christopher W. Olsen for the UbixOS Project.</div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160; *</div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160; * Redistribution and use in source and binary forms, with or without modification, are permitted</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160; * provided that the following conditions are met:</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160; *</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160; * 1) Redistributions of source code must retain the above copyright notice, this list of</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160; *    conditions, the following disclaimer and the list of authors.</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160; * 2) Redistributions in binary form must reproduce the above copyright notice, this list of</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160; *    conditions, the following disclaimer and the list of authors in the documentation and/or</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; *    other materials provided with the distribution.</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160; * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; *    endorse or promote products derived from this software without specific prior written</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; *    permission.</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; *</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160; * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160; * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160; * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160; * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160; * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; */</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;#define BI_VERSION    0x0</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;#define BI_KERNELNAME 0x4</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;#define BI_ENDCOMMON  12</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;#define BI_SIZE       48</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;#define BOOTINFO_SIZE 135</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;#define    RB_BOOTINFO     0x80000000      /* have `struct bootinfo *&#39; arg */</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;.globl _start</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;.text</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;.code32</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;_start:</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;  movw  $0x1234,0x472</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  pushl %ebp</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;  movl  %esp,%ebp</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  pushl $0x00000002</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;  popfl</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;  /* Clear the BSS */</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;  movl  $(_end),%ecx</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;  movl  $(__bss_start),%edi</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  subl  %edi,%ecx</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;  xorl  %eax,%eax</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;  cld</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;  rep</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;  stosb</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;  /* Fix Up GS/FS */</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;  mov %dx,%ax</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  mov %ax,%fs</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  mov %ax,%gs</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  /* Get Boot Args */</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;  call get_bootargs</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;  /* Load GDT */</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;  lgdtl (loadGDT)</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;  mov   $0x10,%eax </div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;  mov   %eax,%ds</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;  mov   %eax,%es</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  mov   %eax,%fs</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;  mov   %eax,%gs</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  mov   %eax,%ss</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  mov   $kStack,%eax</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;  addl  $0x1000,%eax</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;  mov   %esp,%edx</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;  mov   %eax,%esp</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;  mov   %eax,%ebp </div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;  mov   $0x18,%ax</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  lldt  %ax</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;  mov   $0x20,%ax</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;  ltr   %ax</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;  ljmp  $0x08,$start_next</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;start_next:</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;  call vmm_init</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  pushl %esp</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;  mov  %esp,%ebp</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;  mov  $0xFFFFFFFF,%eax</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;  mov  %eax, %esp</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;  pushl $0xDEAD; // Stack</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;  pushl $0xBEEF; // Marker</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;  subl  $0xE,%esp;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;  call kmain</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;get_bootargs:</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;  /*</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;   * The old style disk boot blocks fake a frame on the stack and</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;   * did an lret to get here.  The frame on the stack has a return</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;   * address of 0.</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;   */</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;  cmpl    $0,4(%ebp)</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;  je      old_boot</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;  </div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  /*</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;   * We have some form of return address, so this is either the</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;   * old diskless netboot code, or the new uniform code.  That can</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;   * be detected by looking at the 5th argument, if it is 0</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;   * we are being booted by the new uniform boot code.</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;   */</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  cmpl    $0,24(%ebp)</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;  je      new_boot</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;  hlt</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;new_boot:</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  movl    28(%ebp),%ebx           /* &amp;bootinfo.version */</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  movl    BI_VERSION(%ebx),%eax</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;  cmpl    $1,%eax                 /* We only understand version 1 */</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;  je      1f</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;  movl    $1,%eax                 /* Return status */</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;  leave</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;  /*</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;   * XXX this returns to our caller&#39;s caller (as is required) since</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;   * we didn&#39;t set up a frame and our caller did.</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;   */</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;  hlt /* MrO */</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;  ret</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;1:</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;  /*</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;   * If we have a kernelname copy it in</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;   */</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        movl    BI_KERNELNAME(%ebx),%esi</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        cmpl    $0,%esi</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        je      2f              /* No kernelname */</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        movl    512,%ecx        /* Brute force!!! */</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        movl    $_kernelname,%edi</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;        cmpb    $&#39;/&#39;,(%esi)             /* Make sure it starts with a slash */</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;        je      1f</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        movb    $&#39;/&#39;,(%edi)</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        incl    %edi</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;        decl    %ecx</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;1:</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        cld</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;        rep</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;        movsb</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;2:</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;        /*</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;         * Determine the size of the boot loader&#39;s copy of the bootinfo</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;         * struct.  This is impossible to do properly because old versions</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;         * of the struct don&#39;t contain a size field and there are 2 old</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;         * versions with the same version number.</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;         */</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;        movl    $BI_ENDCOMMON,%ecx      /* prepare for sizeless version */</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        testl   $RB_BOOTINFO,8(%ebp)    /* bi_size (and bootinfo) valid? */</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;        je      got_bi_size             /* no, sizeless version */</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;        movl    BI_SIZE(%ebx),%ecx</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;got_bi_size:</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;        /*</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;         * Copy the common part of the bootinfo struct</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;         */</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;        movl    %ebx,%esi</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;        movl    $_bootinfo,%edi</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;        cmpl    $BOOTINFO_SIZE,%ecx</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;        jbe     got_common_bi_size</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;        movl    $BOOTINFO_SIZE,%ecx</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;got_common_bi_size:</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;        cld</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;        rep</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;        movsb</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;old_boot:</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        movl    8(%ebp),%eax</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        movl    %eax,(_boothowto)</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;        movl    12(%ebp),%eax</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;        movl    %eax,(_bootdev)</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;        ret</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;.data</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;.comm kStack,0x1000</div>
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