📄 main.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/init/main.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/init/main.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>]</div><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/init/">init</a>/<a href="source/init/main.c">main.c</a></h1><div align=center> <b>版本:</b> [<a href="source/init/main.c?v=1.0">1.0</a>] [<a href="source/init/main.c?v=0.99.11">0.99.11</a>] [<a href="source/init/main.c?v=0.99">0.99</a>] [<a href="source/init/main.c?v=0.97">0.97</a>] [<a href="source/init/main.c?v=0.96a">0.96a</a>] [<a href="source/init/main.c?v=0.95">0.95</a>] [<a href="source/init/main.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/init/main.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/init/main.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/init/main.c#L2">2</a> <b><i> * linux/init/main.c</i></b> <a name=L3 href="source/init/main.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/init/main.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/init/main.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/init/main.c#L6">6</a> <a name=L7 href="source/init/main.c#L7">7</a> #define <a href="ident?i=__LIBRARY__">__LIBRARY__</a> <a name=L8 href="source/init/main.c#L8">8</a> #include <unistd.h> <a name=L9 href="source/init/main.c#L9">9</a> #include <time.h> <a name=L10 href="source/init/main.c#L10">10</a> <a name=L11 href="source/init/main.c#L11">11</a> <b><i>/*</i></b> <a name=L12 href="source/init/main.c#L12">12</a> <b><i> * we need this inline - forking from kernel space will result</i></b> <a name=L13 href="source/init/main.c#L13">13</a> <b><i> * in NO COPY ON WRITE (!!!), until an execve is executed. This</i></b> <a name=L14 href="source/init/main.c#L14">14</a> <b><i> * is no problem, but for the stack. This is handled by not letting</i></b> <a name=L15 href="source/init/main.c#L15">15</a> <b><i> * main() use the stack at all after fork(). Thus, no function</i></b> <a name=L16 href="source/init/main.c#L16">16</a> <b><i> * calls - which means inline code for fork too, as otherwise we</i></b> <a name=L17 href="source/init/main.c#L17">17</a> <b><i> * would use the stack upon exit from 'fork()'.</i></b> <a name=L18 href="source/init/main.c#L18">18</a> <b><i> *</i></b> <a name=L19 href="source/init/main.c#L19">19</a> <b><i> * Actually only pause and fork are needed inline, so that there</i></b> <a name=L20 href="source/init/main.c#L20">20</a> <b><i> * won't be any messing with the stack from main(), but we define</i></b> <a name=L21 href="source/init/main.c#L21">21</a> <b><i> * some others too.</i></b> <a name=L22 href="source/init/main.c#L22">22</a> <b><i> */</i></b> <a name=L23 href="source/init/main.c#L23">23</a> static inline <a href="ident?i=_syscall0">_syscall0</a>(int,<a href="ident?i=fork">fork</a>) <a name=L24 href="source/init/main.c#L24">24</a> static inline <a href="ident?i=_syscall0">_syscall0</a>(int,<a href="ident?i=pause">pause</a>) <a name=L25 href="source/init/main.c#L25">25</a> static inline <a href="ident?i=_syscall1">_syscall1</a>(int,setup,void *,BIOS) <a name=L26 href="source/init/main.c#L26">26</a> static inline <a href="ident?i=_syscall0">_syscall0</a>(int,<a href="ident?i=sync">sync</a>) <a name=L27 href="source/init/main.c#L27">27</a> <a name=L28 href="source/init/main.c#L28">28</a> #include <linux/tty.h> <a name=L29 href="source/init/main.c#L29">29</a> #include <linux/sched.h> <a name=L30 href="source/init/main.c#L30">30</a> #include <linux/head.h> <a name=L31 href="source/init/main.c#L31">31</a> #include <asm/system.h> <a name=L32 href="source/init/main.c#L32">32</a> #include <asm/io.h> <a name=L33 href="source/init/main.c#L33">33</a> <a name=L34 href="source/init/main.c#L34">34</a> #include <stddef.h> <a name=L35 href="source/init/main.c#L35">35</a> #include <stdarg.h> <a name=L36 href="source/init/main.c#L36">36</a> #include <unistd.h> <a name=L37 href="source/init/main.c#L37">37</a> #include <fcntl.h> <a name=L38 href="source/init/main.c#L38">38</a> #include <sys/types.h> <a name=L39 href="source/init/main.c#L39">39</a> <a name=L40 href="source/init/main.c#L40">40</a> #include <linux/fs.h> <a name=L41 href="source/init/main.c#L41">41</a> <a name=L42 href="source/init/main.c#L42">42</a> static char <a href="ident?i=printbuf">printbuf</a>[1024]; <a name=L43 href="source/init/main.c#L43">43</a> <a name=L44 href="source/init/main.c#L44">44</a> extern int <a href="ident?i=vsprintf">vsprintf</a>(); <a name=L45 href="source/init/main.c#L45">45</a> extern void <a href="ident?i=init">init</a>(void); <a name=L46 href="source/init/main.c#L46">46</a> extern void <a href="ident?i=blk_dev_init">blk_dev_init</a>(void); <a name=L47 href="source/init/main.c#L47">47</a> extern void <a href="ident?i=chr_dev_init">chr_dev_init</a>(void); <a name=L48 href="source/init/main.c#L48">48</a> extern void <a href="ident?i=hd_init">hd_init</a>(void); <a name=L49 href="source/init/main.c#L49">49</a> extern void <a href="ident?i=floppy_init">floppy_init</a>(void); <a name=L50 href="source/init/main.c#L50">50</a> extern void <a href="ident?i=mem_init">mem_init</a>(long start, long <a href="ident?i=end">end</a>); <a name=L51 href="source/init/main.c#L51">51</a> extern long <a href="ident?i=rd_init">rd_init</a>(long mem_start, int length); <a name=L52 href="source/init/main.c#L52">52</a> extern long <a href="ident?i=kernel_mktime">kernel_mktime</a>(struct <a href="ident?i=tm">tm</a> * <a href="ident?i=tm">tm</a>); <a name=L53 href="source/init/main.c#L53">53</a> extern long <a href="ident?i=startup_time">startup_time</a>; <a name=L54 href="source/init/main.c#L54">54</a> <a name=L55 href="source/init/main.c#L55">55</a> <b><i>/*</i></b> <a name=L56 href="source/init/main.c#L56">56</a> <b><i> * This is set up by the setup-routine at boot-time</i></b> <a name=L57 href="source/init/main.c#L57">57</a> <b><i> */</i></b> <a name=L58 href="source/init/main.c#L58">58</a> #define <a href="ident?i=EXT_MEM_K">EXT_MEM_K</a> (*(unsigned short *)0x90002) <a name=L59 href="source/init/main.c#L59">59</a> #define <a href="ident?i=DRIVE_INFO">DRIVE_INFO</a> (*(struct <a href="ident?i=drive_info">drive_info</a> *)0x90080) <a name=L60 href="source/init/main.c#L60">60</a> #define <a href="ident?i=ORIG_ROOT_DEV">ORIG_ROOT_DEV</a> (*(unsigned short *)0x901FC) <a name=L61 href="source/init/main.c#L61">61</a> <a name=L62 href="source/init/main.c#L62">62</a> <b><i>/*</i></b> <a name=L63 href="source/init/main.c#L63">63</a> <b><i> * Yeah, yeah, it's ugly, but I cannot find how to do this correctly</i></b> <a name=L64 href="source/init/main.c#L64">64</a> <b><i> * and this seems to work. I anybody has more info on the real-time</i></b> <a name=L65 href="source/init/main.c#L65">65</a> <b><i> * clock I'd be interested. Most of this was trial and error, and some</i></b> <a name=L66 href="source/init/main.c#L66">66</a> <b><i> * bios-listing reading. Urghh.</i></b> <a name=L67 href="source/init/main.c#L67">67</a> <b><i> */</i></b> <a name=L68 href="source/init/main.c#L68">68</a> <a name=L69 href="source/init/main.c#L69">69</a> #define <a href="ident?i=CMOS_READ">CMOS_READ</a>(addr) ({ \ <a name=L70 href="source/init/main.c#L70">70</a> <a href="ident?i=outb_p">outb_p</a>(0x80|addr,0x70); \ <a name=L71 href="source/init/main.c#L71">71</a> <a href="ident?i=inb_p">inb_p</a>(0x71); \ <a name=L72 href="source/init/main.c#L72">72</a> }) <a name=L73 href="source/init/main.c#L73">73</a> <a name=L74 href="source/init/main.c#L74">74</a> #define <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(val) ((val)=((val)&15) + ((val)>>4)*10) <a name=L75 href="source/init/main.c#L75">75</a> <a name=L76 href="source/init/main.c#L76">76</a> static void <a href="ident?i=time_init">time_init</a>(void) <a name=L77 href="source/init/main.c#L77">77</a> { <a name=L78 href="source/init/main.c#L78">78</a> struct <a href="ident?i=tm">tm</a> <a href="ident?i=time">time</a>; <a name=L79 href="source/init/main.c#L79">79</a> <a name=L80 href="source/init/main.c#L80">80</a> do { <a name=L81 href="source/init/main.c#L81">81</a> <a href="ident?i=time">time</a>.tm_sec = <a href="ident?i=CMOS_READ">CMOS_READ</a>(0); <a name=L82 href="source/init/main.c#L82">82</a> <a href="ident?i=time">time</a>.tm_min = <a href="ident?i=CMOS_READ">CMOS_READ</a>(2); <a name=L83 href="source/init/main.c#L83">83</a> <a href="ident?i=time">time</a>.tm_hour = <a href="ident?i=CMOS_READ">CMOS_READ</a>(4); <a name=L84 href="source/init/main.c#L84">84</a> <a href="ident?i=time">time</a>.tm_mday = <a href="ident?i=CMOS_READ">CMOS_READ</a>(7); <a name=L85 href="source/init/main.c#L85">85</a> <a href="ident?i=time">time</a>.tm_mon = <a href="ident?i=CMOS_READ">CMOS_READ</a>(8); <a name=L86 href="source/init/main.c#L86">86</a> <a href="ident?i=time">time</a>.tm_year = <a href="ident?i=CMOS_READ">CMOS_READ</a>(9); <a name=L87 href="source/init/main.c#L87">87</a> } while (<a href="ident?i=time">time</a>.tm_sec != <a href="ident?i=CMOS_READ">CMOS_READ</a>(0)); <a name=L88 href="source/init/main.c#L88">88</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_sec); <a name=L89 href="source/init/main.c#L89">89</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_min); <a name=L90 href="source/init/main.c#L90">90</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_hour); <a name=L91 href="source/init/main.c#L91">91</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_mday); <a name=L92 href="source/init/main.c#L92">92</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_mon); <a name=L93 href="source/init/main.c#L93">93</a> <a href="ident?i=BCD_TO_BIN">BCD_TO_BIN</a>(<a href="ident?i=time">time</a>.tm_year); <a name=L94 href="source/init/main.c#L94">94</a> <a href="ident?i=time">time</a>.tm_mon--; <a name=L95 href="source/init/main.c#L95">95</a> <a href="ident?i=startup_time">startup_time</a> = <a href="ident?i=kernel_mktime">kernel_mktime</a>(&<a href="ident?i=time">time</a>);⌨️ 快捷键说明
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