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<div class="title">ap-boot.S</div> </div>
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<a href="i386_2ap-boot_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> /*-</div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  * Copyright (c) 2002-2018 The UbixOS Project.</div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  * All rights reserved.</div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>  *</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  * This was developed by Christopher W. Olsen for the UbixOS Project.</div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  *</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  * 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>  * provided that the following conditions are met:</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  *</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  * 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>  * conditions, the following disclaimer and the list of authors.</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  * 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>  * 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>  * other materials provided with the distribution.</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  * 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>  * 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>  * permission.</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  *</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  * 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>  * 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>  * 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>  * (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>  * 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>  * 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>  * 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>  */</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> /*</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  * Okay, this file contains the code that's going to bootstrap the AP cpus</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  */</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  .globl ap_trampoline_start,ap_trampoline_end</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  .text</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  .code16</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> ap_trampoline_start:</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  cli</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  cld</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  movw %cs,%ax // The CPU knows its CS already, so lets use it for the other segments</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  movw %ax,%ds</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  movw %ax,%es</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  movw %ax,%ss</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  // Do some bochs-specific bullshit</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  mov $0x31,%al // '1'</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  mov $0xe9,%dx</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  outb %al,%dx</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  //lgdt ap_gdt; </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  lgdt ap_trampoline_gdt_limit - ap_trampoline_start</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  movl %cr0,%eax</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  orl $0x1,%eax</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  movl %eax,%cr0 // PMODE!</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> .code32</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  .byte 0x66</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  ljmp $0x08,$(ap_trampoline_32 - ap_trampoline_start) // 0x08 == KERNEL_CS</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> ap_trampoline_32:</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  mov $0x32,%al // '2'</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  mov $0xe9,%dx</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  outb %al,%dx</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  mov $0x10,%ax</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  mov %ax,%ds</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  mov %ax,%es</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  mov %ax,%fs</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  mov %ax,%gs</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  mov %ax,%ss</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  // Spinlock</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  mov ap_trampoline_spl - ap_trampoline_start,%edi</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> ap_spl:</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  //cmp $1,(%edi)</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  //je ap_spl</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  mov $1,%eax // Value to be set</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  xchgl (%edi),%eax</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  cmp $0,%eax</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  je ap_spl</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  // /Spinlock</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  mov $0x30,%al // '0'</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  mov $0xe9,%dx</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  outb %al,%dx</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  mov ap_trampoline_stackptr - ap_trampoline_start,%ebx</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  mov %ebx,%esp</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  add $0x1000,%ebx</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  mov %ebx,ap_trampoline_stackptr - ap_trampoline_start</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  mov $0x31,%al // '1'</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  mov $0xe9,%dx</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  outb %al,%dx</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  // spinunlock</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  mov $0,%eax</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  mov ap_trampoline_spl - ap_trampoline_start,%edi</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  xchgl (%edi),%eax</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  // /spinunlock</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  mov $0x33,%al // '3'</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  mov $0xe9,%dx</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  outb %al,%dx</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  mov ap_trampoline_epoint,%eax</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  call *%eax</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> 1:</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  hlt</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  jmp 1b // Halt if we ever get here somehow</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  // Stack.. This sucks, since CPU initialization isn't serialized</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> ap_trampoline_stackptr:</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  .long 0x10000 // 256KB</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> ap_trampoline_epoint:</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  .long c_ap_boot</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> ap_trampoline_spl:</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  .long 0</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> ap_gdt:</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  .long ubixGDT</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  // GDT</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> ap_trampoline_gdt:</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  .word 0</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> ap_trampoline_gdt_limit:</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  .word 128 // Room for 32 descriptors</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> ap_trampoline_gdt_base:</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  .long 0x20000 // 128KB (move this later)</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> ap_trampoline_end:</div>
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