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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/blk_drv/hd.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http_cn/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/blk_drv/hd.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/kernel/">kernel</a>/<a href="source/kernel/blk_drv/">blk_drv</a>/<a href="source/kernel/blk_drv/hd.c">hd.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/blk_drv/hd.c?v=1.0">1.0</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.99">0.99</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.98">0.98</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.97">0.97</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.96a">0.96a</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.95">0.95</a>] [<a href="source/kernel/blk_drv/hd.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/blk_drv/hd.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/kernel/blk_drv/hd.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/blk_drv/hd.c#L2">2</a> <b><i> * linux/kernel/hd.c</i></b> <a name=L3 href="source/kernel/blk_drv/hd.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/blk_drv/hd.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/kernel/blk_drv/hd.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/blk_drv/hd.c#L6">6</a> <a name=L7 href="source/kernel/blk_drv/hd.c#L7">7</a> <b><i>/*</i></b> <a name=L8 href="source/kernel/blk_drv/hd.c#L8">8</a> <b><i> * This is the low-level hd interrupt support. It traverses the</i></b> <a name=L9 href="source/kernel/blk_drv/hd.c#L9">9</a> <b><i> * request-list, using interrupts to jump between functions. As</i></b> <a name=L10 href="source/kernel/blk_drv/hd.c#L10">10</a> <b><i> * all the functions are called within interrupts, we may not</i></b> <a name=L11 href="source/kernel/blk_drv/hd.c#L11">11</a> <b><i> * sleep. Special care is recommended.</i></b> <a name=L12 href="source/kernel/blk_drv/hd.c#L12">12</a> <b><i> * </i></b> <a name=L13 href="source/kernel/blk_drv/hd.c#L13">13</a> <b><i> * modified by Drew Eckhardt to check nr of hd's from the CMOS.</i></b> <a name=L14 href="source/kernel/blk_drv/hd.c#L14">14</a> <b><i> */</i></b> <a name=L15 href="source/kernel/blk_drv/hd.c#L15">15</a> <a name=L16 href="source/kernel/blk_drv/hd.c#L16">16</a> #include <linux/config.h> <a name=L17 href="source/kernel/blk_drv/hd.c#L17">17</a> #include <linux/sched.h> <a name=L18 href="source/kernel/blk_drv/hd.c#L18">18</a> #include <linux/fs.h> <a name=L19 href="source/kernel/blk_drv/hd.c#L19">19</a> #include <linux/kernel.h> <a name=L20 href="source/kernel/blk_drv/hd.c#L20">20</a> #include <linux/hdreg.h> <a name=L21 href="source/kernel/blk_drv/hd.c#L21">21</a> #include <asm/system.h> <a name=L22 href="source/kernel/blk_drv/hd.c#L22">22</a> #include <asm/io.h> <a name=L23 href="source/kernel/blk_drv/hd.c#L23">23</a> #include <asm/segment.h> <a name=L24 href="source/kernel/blk_drv/hd.c#L24">24</a> <a name=L25 href="source/kernel/blk_drv/hd.c#L25">25</a> #define <a href="ident?i=MAJOR_NR">MAJOR_NR</a> 3 <a name=L26 href="source/kernel/blk_drv/hd.c#L26">26</a> #include "<a href="source/kernel/blk_drv/blk.h">blk.h</a>" <a name=L27 href="source/kernel/blk_drv/hd.c#L27">27</a> <a name=L28 href="source/kernel/blk_drv/hd.c#L28">28</a> #define <a href="ident?i=CMOS_READ">CMOS_READ</a>(addr) ({ \ <a name=L29 href="source/kernel/blk_drv/hd.c#L29">29</a> <a href="ident?i=outb_p">outb_p</a>(0x80|addr,0x70); \ <a name=L30 href="source/kernel/blk_drv/hd.c#L30">30</a> <a href="ident?i=inb_p">inb_p</a>(0x71); \ <a name=L31 href="source/kernel/blk_drv/hd.c#L31">31</a> }) <a name=L32 href="source/kernel/blk_drv/hd.c#L32">32</a> <a name=L33 href="source/kernel/blk_drv/hd.c#L33">33</a> <b><i>/* Max read/write errors/sector */</i></b> <a name=L34 href="source/kernel/blk_drv/hd.c#L34">34</a> #define <a href="ident?i=MAX_ERRORS">MAX_ERRORS</a> 7 <a name=L35 href="source/kernel/blk_drv/hd.c#L35">35</a> #define <a href="ident?i=MAX_HD">MAX_HD</a> 2 <a name=L36 href="source/kernel/blk_drv/hd.c#L36">36</a> <a name=L37 href="source/kernel/blk_drv/hd.c#L37">37</a> static void <a href="ident?i=recal_intr">recal_intr</a>(void); <a name=L38 href="source/kernel/blk_drv/hd.c#L38">38</a> <a name=L39 href="source/kernel/blk_drv/hd.c#L39">39</a> static int <a href="ident?i=recalibrate">recalibrate</a> = 1; <a name=L40 href="source/kernel/blk_drv/hd.c#L40">40</a> static int <a href="ident?i=reset">reset</a> = 1; <a name=L41 href="source/kernel/blk_drv/hd.c#L41">41</a> <a name=L42 href="source/kernel/blk_drv/hd.c#L42">42</a> <b><i>/*</i></b> <a name=L43 href="source/kernel/blk_drv/hd.c#L43">43</a> <b><i> * This struct defines the HD's and their types.</i></b> <a name=L44 href="source/kernel/blk_drv/hd.c#L44">44</a> <b><i> */</i></b> <a name=L45 href="source/kernel/blk_drv/hd.c#L45">45</a> struct <a href="ident?i=hd_i_struct">hd_i_struct</a> { <a name=L46 href="source/kernel/blk_drv/hd.c#L46">46</a> int <a href="ident?i=head">head</a>,sect,cyl,wpcom,lzone,ctl; <a name=L47 href="source/kernel/blk_drv/hd.c#L47">47</a> }; <a name=L48 href="source/kernel/blk_drv/hd.c#L48">48</a> #ifdef HD_TYPE <a name=L49 href="source/kernel/blk_drv/hd.c#L49">49</a> struct <a href="ident?i=hd_i_struct">hd_i_struct</a> <a href="ident?i=hd_info">hd_info</a>[] = { HD_TYPE }; <a name=L50 href="source/kernel/blk_drv/hd.c#L50">50</a> #define <a href="ident?i=NR_HD">NR_HD</a> ((sizeof (<a href="ident?i=hd_info">hd_info</a>))/(sizeof (struct <a href="ident?i=hd_i_struct">hd_i_struct</a>))) <a name=L51 href="source/kernel/blk_drv/hd.c#L51">51</a> #else <a name=L52 href="source/kernel/blk_drv/hd.c#L52">52</a> struct <a href="ident?i=hd_i_struct">hd_i_struct</a> <a href="ident?i=hd_info">hd_info</a>[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} }; <a name=L53 href="source/kernel/blk_drv/hd.c#L53">53</a> static int <a href="ident?i=NR_HD">NR_HD</a> = 0; <a name=L54 href="source/kernel/blk_drv/hd.c#L54">54</a> #endif <a name=L55 href="source/kernel/blk_drv/hd.c#L55">55</a> <a name=L56 href="source/kernel/blk_drv/hd.c#L56">56</a> static struct <a href="ident?i=hd_struct">hd_struct</a> { <a name=L57 href="source/kernel/blk_drv/hd.c#L57">57</a> long start_sect; <a name=L58 href="source/kernel/blk_drv/hd.c#L58">58</a> long nr_sects; <a name=L59 href="source/kernel/blk_drv/hd.c#L59">59</a> } <a href="ident?i=hd">hd</a>[5*<a href="ident?i=MAX_HD">MAX_HD</a>]={{0,0},}; <a name=L60 href="source/kernel/blk_drv/hd.c#L60">60</a> <a name=L61 href="source/kernel/blk_drv/hd.c#L61">61</a> #define <a href="ident?i=port_read">port_read</a>(port,<a href="ident?i=buf">buf</a>,nr) \ <a name=L62 href="source/kernel/blk_drv/hd.c#L62">62</a> __asm__(<i>"cld;rep;insw"</i>::<i>"d"</i> (port),<i>"D"</i> (<a href="ident?i=buf">buf</a>),<i>"c"</i> (nr):<i>"cx"</i>,<i>"di"</i>) <a name=L63 href="source/kernel/blk_drv/hd.c#L63">63</a> <a name=L64 href="source/kernel/blk_drv/hd.c#L64">64</a> #define <a href="ident?i=port_write">port_write</a>(port,<a href="ident?i=buf">buf</a>,nr) \ <a name=L65 href="source/kernel/blk_drv/hd.c#L65">65</a> __asm__(<i>"cld;rep;outsw"</i>::<i>"d"</i> (port),<i>"S"</i> (<a href="ident?i=buf">buf</a>),<i>"c"</i> (nr):<i>"cx"</i>,<i>"si"</i>) <a name=L66 href="source/kernel/blk_drv/hd.c#L66">66</a> <a name=L67 href="source/kernel/blk_drv/hd.c#L67">67</a> extern void <a href="ident?i=hd_interrupt">hd_interrupt</a>(void); <a name=L68 href="source/kernel/blk_drv/hd.c#L68">68</a> extern void <a href="ident?i=rd_load">rd_load</a>(void); <a name=L69 href="source/kernel/blk_drv/hd.c#L69">69</a> <a name=L70 href="source/kernel/blk_drv/hd.c#L70">70</a> <b><i>/* This may be used only once, enforced by 'static int callable' */</i></b> <a name=L71 href="source/kernel/blk_drv/hd.c#L71">71</a> int <a href="ident?i=sys_setup">sys_setup</a>(void * BIOS) <a name=L72 href="source/kernel/blk_drv/hd.c#L72">72</a> { <a name=L73 href="source/kernel/blk_drv/hd.c#L73">73</a> static int callable = 1; <a name=L74 href="source/kernel/blk_drv/hd.c#L74">74</a> int i,drive; <a name=L75 href="source/kernel/blk_drv/hd.c#L75">75</a> unsigned char cmos_disks; <a name=L76 href="source/kernel/blk_drv/hd.c#L76">76</a> struct <a href="ident?i=partition">partition</a> *p; <a name=L77 href="source/kernel/blk_drv/hd.c#L77">77</a> struct <a href="ident?i=buffer_head">buffer_head</a> * bh; <a name=L78 href="source/kernel/blk_drv/hd.c#L78">78</a> <a name=L79 href="source/kernel/blk_drv/hd.c#L79">79</a> if (!callable) <a name=L80 href="source/kernel/blk_drv/hd.c#L80">80</a> return -1; <a name=L81 href="source/kernel/blk_drv/hd.c#L81">81</a> callable = 0; <a name=L82 href="source/kernel/blk_drv/hd.c#L82">82</a> #ifndef HD_TYPE <a name=L83 href="source/kernel/blk_drv/hd.c#L83">83</a> for (drive=0 ; drive<2 ; drive++) { <a name=L84 href="source/kernel/blk_drv/hd.c#L84">84</a> <a href="ident?i=hd_info">hd_info</a>[drive].cyl = *(unsigned short *) BIOS; <a name=L85 href="source/kernel/blk_drv/hd.c#L85">85</a> <a href="ident?i=hd_info">hd_info</a>[drive].<a href="ident?i=head">head</a> = *(unsigned char *) (2+BIOS); <a name=L86 href="source/kernel/blk_drv/hd.c#L86">86</a> <a href="ident?i=hd_info">hd_info</a>[drive].wpcom = *(unsigned short *) (5+BIOS); <a name=L87 href="source/kernel/blk_drv/hd.c#L87">87</a> <a href="ident?i=hd_info">hd_info</a>[drive].ctl = *(unsigned char *) (8+BIOS); <a name=L88 href="source/kernel/blk_drv/hd.c#L88">88</a> <a href="ident?i=hd_info">hd_info</a>[drive].lzone = *(unsigned short *) (12+BIOS); <a name=L89 href="source/kernel/blk_drv/hd.c#L89">89</a> <a href="ident?i=hd_info">hd_info</a>[drive].sect = *(unsigned char *) (14+BIOS); <a name=L90 href="source/kernel/blk_drv/hd.c#L90">90</a> BIOS += 16; <a name=L91 href="source/kernel/blk_drv/hd.c#L91">91</a> } <a name=L92 href="source/kernel/blk_drv/hd.c#L92">92</a> if (<a href="ident?i=hd_info">hd_info</a>[1].cyl) <a name=L93 href="source/kernel/blk_drv/hd.c#L93">93</a> <a href="ident?i=NR_HD">NR_HD</a>=2; <a name=L94 href="source/kernel/blk_drv/hd.c#L94">94</a> else <a name=L95 href="source/kernel/blk_drv/hd.c#L95">95</a> <a href="ident?i=NR_HD">NR_HD</a>=1; <a name=L96 href="source/kernel/blk_drv/hd.c#L96">96</a> #endif <a name=L97 href="source/kernel/blk_drv/hd.c#L97">97</a> for (i=0 ; i<<a href="ident?i=NR_HD">NR_HD</a> ; i++) { <a name=L98 href="source/kernel/blk_drv/hd.c#L98">98</a> <a href="ident?i=hd">hd</a>[i*5].start_sect = 0; <a name=L99 href="source/kernel/blk_drv/hd.c#L99">99</a> <a href="ident?i=hd">hd</a>[i*5].nr_sects = <a href="ident?i=hd_info">hd_info</a>[i].<a href="ident?i=head">head</a>*<a name=L100 href="source/kernel/blk_drv/hd.c#L100">100</a> <a href="ident?i=hd_info">hd_info</a>[i].sect*<a href="ident?i=hd_info">hd_info</a>[i].cyl;⌨️ 快捷键说明
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