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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/boot/setup.s</title><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>source navigation</i></b>] [<a href="diff/boot/setup.s">diff markup</a>] [<a href="ident">identifier search</a>] [<a href="search">freetext search</a>] [<a href="find">file search</a>]</div><h1 align=center> <a href="http:/"> Oldlinux</a> <a href="http:blurb.html"> Cross Reference</a><br> <a href="source/">Linux</a>/<a href="source/boot/">boot</a>/<a href="source/boot/setup.s">setup.s</a></h1><div align=center> <b>Version:</b> [<a href="source/boot/setup.s?v=1.0">1.0</a>] [<a href="source/boot/setup.s?v=0.99.11">0.99.11</a>] [<a href="source/boot/setup.s?v=0.99">0.99</a>] [<a href="source/boot/setup.s?v=0.98">0.98</a>] [<a href="source/boot/setup.s?v=0.97">0.97</a>] [<a href="source/boot/setup.s?v=0.96a">0.96a</a>] [<a href="source/boot/setup.s?v=0.95">0.95</a>] [<a href="source/boot/setup.s?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/boot/setup.s?v=0.01">0.01</a>] <br> <b>Architecture:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/boot/setup.s#L1">1</a> ! <a name=L2 href="source/boot/setup.s#L2">2</a> ! setup.s (C) 1991 Linus Torvalds <a name=L3 href="source/boot/setup.s#L3">3</a> ! <a name=L4 href="source/boot/setup.s#L4">4</a> ! setup.s is responsible for getting the system data from the BIOS, <a name=L5 href="source/boot/setup.s#L5">5</a> ! and putting them into the appropriate places in system memory. <a name=L6 href="source/boot/setup.s#L6">6</a> ! both setup.s and system has been loaded by the bootblock. <a name=L7 href="source/boot/setup.s#L7">7</a> ! <a name=L8 href="source/boot/setup.s#L8">8</a> ! This code asks the bios for memory/disk/other parameters, and <a name=L9 href="source/boot/setup.s#L9">9</a> ! puts them in a "safe" place: 0x90000-0x901FF, ie where the <a name=L10 href="source/boot/setup.s#L10">10</a> ! boot-block used to be. It is then up to the protected mode <a name=L11 href="source/boot/setup.s#L11">11</a> ! system to read them from there before the area is overwritten <a name=L12 href="source/boot/setup.s#L12">12</a> ! for buffer-blocks. <a name=L13 href="source/boot/setup.s#L13">13</a> ! <a name=L14 href="source/boot/setup.s#L14">14</a> <a name=L15 href="source/boot/setup.s#L15">15</a> ! NOTE! These had better be the same as in bootsect.s! <a name=L16 href="source/boot/setup.s#L16">16</a> <a name=L17 href="source/boot/setup.s#L17">17</a> INITSEG = 0x9000 ! we move boot here - out of the way <a name=L18 href="source/boot/setup.s#L18">18</a> SYSSEG = 0x1000 ! system loaded at 0x10000 (65536). <a name=L19 href="source/boot/setup.s#L19">19</a> SETUPSEG = 0x9020 ! this is the current segment <a name=L20 href="source/boot/setup.s#L20">20</a> <a name=L21 href="source/boot/setup.s#L21">21</a> .globl begtext, begdata, begbss, endtext, enddata, endbss <a name=L22 href="source/boot/setup.s#L22">22</a> .text <a name=L23 href="source/boot/setup.s#L23">23</a> begtext: <a name=L24 href="source/boot/setup.s#L24">24</a> .data <a name=L25 href="source/boot/setup.s#L25">25</a> begdata: <a name=L26 href="source/boot/setup.s#L26">26</a> .bss <a name=L27 href="source/boot/setup.s#L27">27</a> begbss: <a name=L28 href="source/boot/setup.s#L28">28</a> .text <a name=L29 href="source/boot/setup.s#L29">29</a> <a name=L30 href="source/boot/setup.s#L30">30</a> entry start <a name=L31 href="source/boot/setup.s#L31">31</a> start: <a name=L32 href="source/boot/setup.s#L32">32</a> <a name=L33 href="source/boot/setup.s#L33">33</a> ! ok, the read went well so we get current cursor position and save it for <a name=L34 href="source/boot/setup.s#L34">34</a> ! posterity. <a name=L35 href="source/boot/setup.s#L35">35</a> <a name=L36 href="source/boot/setup.s#L36">36</a> mov ax,#INITSEG ! this is done in bootsect already, but... <a name=L37 href="source/boot/setup.s#L37">37</a> mov ds,ax <a name=L38 href="source/boot/setup.s#L38">38</a> mov ah,#0x03 ! read cursor pos <a name=L39 href="source/boot/setup.s#L39">39</a> xor bh,bh <a name=L40 href="source/boot/setup.s#L40">40</a> int 0x10 ! save it in known place, con_init fetches <a name=L41 href="source/boot/setup.s#L41">41</a> mov [0],dx ! it from 0x90000. <a name=L42 href="source/boot/setup.s#L42">42</a> <a name=L43 href="source/boot/setup.s#L43">43</a> ! Get memory size (extended mem, kB) <a name=L44 href="source/boot/setup.s#L44">44</a> <a name=L45 href="source/boot/setup.s#L45">45</a> mov ah,#0x88 <a name=L46 href="source/boot/setup.s#L46">46</a> int 0x15 <a name=L47 href="source/boot/setup.s#L47">47</a> mov [2],ax <a name=L48 href="source/boot/setup.s#L48">48</a> <a name=L49 href="source/boot/setup.s#L49">49</a> ! Get video-card data: <a name=L50 href="source/boot/setup.s#L50">50</a> <a name=L51 href="source/boot/setup.s#L51">51</a> mov ah,#0x0f <a name=L52 href="source/boot/setup.s#L52">52</a> int 0x10 <a name=L53 href="source/boot/setup.s#L53">53</a> mov [4],bx ! bh = display page <a name=L54 href="source/boot/setup.s#L54">54</a> mov [6],ax ! al = video mode, ah = window width <a name=L55 href="source/boot/setup.s#L55">55</a> <a name=L56 href="source/boot/setup.s#L56">56</a> ! check for EGA/VGA and some config parameters <a name=L57 href="source/boot/setup.s#L57">57</a> <a name=L58 href="source/boot/setup.s#L58">58</a> mov ah,#0x12 <a name=L59 href="source/boot/setup.s#L59">59</a> mov bl,#0x10 <a name=L60 href="source/boot/setup.s#L60">60</a> int 0x10 <a name=L61 href="source/boot/setup.s#L61">61</a> mov [8],ax <a name=L62 href="source/boot/setup.s#L62">62</a> mov [10],bx <a name=L63 href="source/boot/setup.s#L63">63</a> mov [12],cx <a name=L64 href="source/boot/setup.s#L64">64</a> <a name=L65 href="source/boot/setup.s#L65">65</a> ! Get hd0 data <a name=L66 href="source/boot/setup.s#L66">66</a> <a name=L67 href="source/boot/setup.s#L67">67</a> mov ax,#0x0000 <a name=L68 href="source/boot/setup.s#L68">68</a> mov ds,ax <a name=L69 href="source/boot/setup.s#L69">69</a> lds si,[4*0x41] <a name=L70 href="source/boot/setup.s#L70">70</a> mov ax,#INITSEG <a name=L71 href="source/boot/setup.s#L71">71</a> mov es,ax <a name=L72 href="source/boot/setup.s#L72">72</a> mov di,#0x0080 <a name=L73 href="source/boot/setup.s#L73">73</a> mov cx,#0x10 <a name=L74 href="source/boot/setup.s#L74">74</a> rep <a name=L75 href="source/boot/setup.s#L75">75</a> movsb <a name=L76 href="source/boot/setup.s#L76">76</a> <a name=L77 href="source/boot/setup.s#L77">77</a> ! Get hd1 data <a name=L78 href="source/boot/setup.s#L78">78</a> <a name=L79 href="source/boot/setup.s#L79">79</a> mov ax,#0x0000 <a name=L80 href="source/boot/setup.s#L80">80</a> mov ds,ax <a name=L81 href="source/boot/setup.s#L81">81</a> lds si,[4*0x46] <a name=L82 href="source/boot/setup.s#L82">82</a> mov ax,#INITSEG <a name=L83 href="source/boot/setup.s#L83">83</a> mov es,ax <a name=L84 href="source/boot/setup.s#L84">84</a> mov di,#0x0090 <a name=L85 href="source/boot/setup.s#L85">85</a> mov cx,#0x10 <a name=L86 href="source/boot/setup.s#L86">86</a> rep <a name=L87 href="source/boot/setup.s#L87">87</a> movsb <a name=L88 href="source/boot/setup.s#L88">88</a> <a name=L89 href="source/boot/setup.s#L89">89</a> ! Check that there IS a hd1 :-) <a name=L90 href="source/boot/setup.s#L90">90</a> <a name=L91 href="source/boot/setup.s#L91">91</a> mov ax,#0x01500 <a name=L92 href="source/boot/setup.s#L92">92</a> mov dl,#0x81 <a name=L93 href="source/boot/setup.s#L93">93</a> int 0x13 <a name=L94 href="source/boot/setup.s#L94">94</a> jc no_disk1 <a name=L95 href="source/boot/setup.s#L95">95</a> cmp ah,#3 <a name=L96 href="source/boot/setup.s#L96">96</a> je is_disk1 <a name=L97 href="source/boot/setup.s#L97">97</a> no_disk1: <a name=L98 href="source/boot/setup.s#L98">98</a> mov ax,#INITSEG <a name=L99 href="source/boot/setup.s#L99">99</a> mov es,ax<a name=L100 href="source/boot/setup.s#L100">100</a> mov di,#0x0090<a name=L101 href="source/boot/setup.s#L101">101</a> mov cx,#0x10<a name=L102 href="source/boot/setup.s#L102">102</a> mov ax,#0x00<a name=L103 href="source/boot/setup.s#L103">103</a> rep<a name=L104 href="source/boot/setup.s#L104">104</a> stosb<a name=L105 href="source/boot/setup.s#L105">105</a> is_disk1:<a name=L106 href="source/boot/setup.s#L106">106</a> <a name=L107 href="source/boot/setup.s#L107">107</a> ! now we want to move to protected mode ...⌨️ 快捷键说明
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