📄 floppy.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/blk_drv/floppy.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/kernel/blk_drv/floppy.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/floppy.c">floppy.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/blk_drv/floppy.c?v=1.0">1.0</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.99">0.99</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.97">0.97</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.96a">0.96a</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.95">0.95</a>] [<a href="source/kernel/blk_drv/floppy.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/blk_drv/floppy.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/floppy.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/blk_drv/floppy.c#L2">2</a> <b><i> * linux/kernel/floppy.c</i></b> <a name=L3 href="source/kernel/blk_drv/floppy.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/blk_drv/floppy.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/kernel/blk_drv/floppy.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/blk_drv/floppy.c#L6">6</a> <a name=L7 href="source/kernel/blk_drv/floppy.c#L7">7</a> <b><i>/*</i></b> <a name=L8 href="source/kernel/blk_drv/floppy.c#L8">8</a> <b><i> * 02.12.91 - Changed to static variables to indicate need for reset</i></b> <a name=L9 href="source/kernel/blk_drv/floppy.c#L9">9</a> <b><i> * and recalibrate. This makes some things easier (output_byte reset</i></b> <a name=L10 href="source/kernel/blk_drv/floppy.c#L10">10</a> <b><i> * checking etc), and means less interrupt jumping in case of errors,</i></b> <a name=L11 href="source/kernel/blk_drv/floppy.c#L11">11</a> <b><i> * so the code is hopefully easier to understand.</i></b> <a name=L12 href="source/kernel/blk_drv/floppy.c#L12">12</a> <b><i> */</i></b> <a name=L13 href="source/kernel/blk_drv/floppy.c#L13">13</a> <a name=L14 href="source/kernel/blk_drv/floppy.c#L14">14</a> <b><i>/*</i></b> <a name=L15 href="source/kernel/blk_drv/floppy.c#L15">15</a> <b><i> * This file is certainly a mess. I've tried my best to get it working,</i></b> <a name=L16 href="source/kernel/blk_drv/floppy.c#L16">16</a> <b><i> * but I don't like programming floppies, and I have only one anyway.</i></b> <a name=L17 href="source/kernel/blk_drv/floppy.c#L17">17</a> <b><i> * Urgel. I should check for more errors, and do more graceful error</i></b> <a name=L18 href="source/kernel/blk_drv/floppy.c#L18">18</a> <b><i> * recovery. Seems there are problems with several drives. I've tried to</i></b> <a name=L19 href="source/kernel/blk_drv/floppy.c#L19">19</a> <b><i> * correct them. No promises. </i></b> <a name=L20 href="source/kernel/blk_drv/floppy.c#L20">20</a> <b><i> */</i></b> <a name=L21 href="source/kernel/blk_drv/floppy.c#L21">21</a> <a name=L22 href="source/kernel/blk_drv/floppy.c#L22">22</a> <b><i>/*</i></b> <a name=L23 href="source/kernel/blk_drv/floppy.c#L23">23</a> <b><i> * As with hd.c, all routines within this file can (and will) be called</i></b> <a name=L24 href="source/kernel/blk_drv/floppy.c#L24">24</a> <b><i> * by interrupts, so extreme caution is needed. A hardware interrupt</i></b> <a name=L25 href="source/kernel/blk_drv/floppy.c#L25">25</a> <b><i> * handler may not sleep, or a kernel panic will happen. Thus I cannot</i></b> <a name=L26 href="source/kernel/blk_drv/floppy.c#L26">26</a> <b><i> * call "floppy-on" directly, but have to set a special timer interrupt</i></b> <a name=L27 href="source/kernel/blk_drv/floppy.c#L27">27</a> <b><i> * etc.</i></b> <a name=L28 href="source/kernel/blk_drv/floppy.c#L28">28</a> <b><i> *</i></b> <a name=L29 href="source/kernel/blk_drv/floppy.c#L29">29</a> <b><i> * Also, I'm not certain this works on more than 1 floppy. Bugs may</i></b> <a name=L30 href="source/kernel/blk_drv/floppy.c#L30">30</a> <b><i> * abund.</i></b> <a name=L31 href="source/kernel/blk_drv/floppy.c#L31">31</a> <b><i> */</i></b> <a name=L32 href="source/kernel/blk_drv/floppy.c#L32">32</a> <a name=L33 href="source/kernel/blk_drv/floppy.c#L33">33</a> #include <linux/sched.h> <a name=L34 href="source/kernel/blk_drv/floppy.c#L34">34</a> #include <linux/fs.h> <a name=L35 href="source/kernel/blk_drv/floppy.c#L35">35</a> #include <linux/kernel.h> <a name=L36 href="source/kernel/blk_drv/floppy.c#L36">36</a> #include <linux/fdreg.h> <a name=L37 href="source/kernel/blk_drv/floppy.c#L37">37</a> #include <asm/system.h> <a name=L38 href="source/kernel/blk_drv/floppy.c#L38">38</a> #include <asm/io.h> <a name=L39 href="source/kernel/blk_drv/floppy.c#L39">39</a> #include <asm/segment.h> <a name=L40 href="source/kernel/blk_drv/floppy.c#L40">40</a> <a name=L41 href="source/kernel/blk_drv/floppy.c#L41">41</a> #define <a href="ident?i=MAJOR_NR">MAJOR_NR</a> 2 <a name=L42 href="source/kernel/blk_drv/floppy.c#L42">42</a> #include "<a href="source/kernel/blk_drv/blk.h">blk.h</a>" <a name=L43 href="source/kernel/blk_drv/floppy.c#L43">43</a> <a name=L44 href="source/kernel/blk_drv/floppy.c#L44">44</a> static int <a href="ident?i=recalibrate">recalibrate</a> = 0; <a name=L45 href="source/kernel/blk_drv/floppy.c#L45">45</a> static int <a href="ident?i=reset">reset</a> = 0; <a name=L46 href="source/kernel/blk_drv/floppy.c#L46">46</a> static int <a href="ident?i=seek">seek</a> = 0; <a name=L47 href="source/kernel/blk_drv/floppy.c#L47">47</a> <a name=L48 href="source/kernel/blk_drv/floppy.c#L48">48</a> extern unsigned char <a href="ident?i=current_DOR">current_DOR</a>; <a name=L49 href="source/kernel/blk_drv/floppy.c#L49">49</a> <a name=L50 href="source/kernel/blk_drv/floppy.c#L50">50</a> #define <a href="ident?i=immoutb_p">immoutb_p</a>(val,port) \ <a name=L51 href="source/kernel/blk_drv/floppy.c#L51">51</a> __asm__(<i>"outb %0,%1\n\tjmp 1f\n1:\tjmp 1f\n1:"</i>::<i>"a"</i> ((char) (val)),<i>"i"</i> (port)) <a name=L52 href="source/kernel/blk_drv/floppy.c#L52">52</a> <a name=L53 href="source/kernel/blk_drv/floppy.c#L53">53</a> #define <a href="ident?i=TYPE">TYPE</a>(<a href="ident?i=x">x</a>) ((<a href="ident?i=x">x</a>)>>2) <a name=L54 href="source/kernel/blk_drv/floppy.c#L54">54</a> #define <a href="ident?i=DRIVE">DRIVE</a>(<a href="ident?i=x">x</a>) ((<a href="ident?i=x">x</a>)&0x03) <a name=L55 href="source/kernel/blk_drv/floppy.c#L55">55</a> <b><i>/*</i></b> <a name=L56 href="source/kernel/blk_drv/floppy.c#L56">56</a> <b><i> * Note that MAX_ERRORS=8 doesn't imply that we retry every bad read</i></b> <a name=L57 href="source/kernel/blk_drv/floppy.c#L57">57</a> <b><i> * max 8 times - some types of errors increase the errorcount by 2,</i></b> <a name=L58 href="source/kernel/blk_drv/floppy.c#L58">58</a> <b><i> * so we might actually retry only 5-6 times before giving up.</i></b> <a name=L59 href="source/kernel/blk_drv/floppy.c#L59">59</a> <b><i> */</i></b> <a name=L60 href="source/kernel/blk_drv/floppy.c#L60">60</a> #define <a href="ident?i=MAX_ERRORS">MAX_ERRORS</a> 8 <a name=L61 href="source/kernel/blk_drv/floppy.c#L61">61</a> <a name=L62 href="source/kernel/blk_drv/floppy.c#L62">62</a> <b><i>/*</i></b> <a name=L63 href="source/kernel/blk_drv/floppy.c#L63">63</a> <b><i> * globals used by 'result()'</i></b> <a name=L64 href="source/kernel/blk_drv/floppy.c#L64">64</a> <b><i> */</i></b> <a name=L65 href="source/kernel/blk_drv/floppy.c#L65">65</a> #define <a href="ident?i=MAX_REPLIES">MAX_REPLIES</a> 7 <a name=L66 href="source/kernel/blk_drv/floppy.c#L66">66</a> static unsigned char <a href="ident?i=reply_buffer">reply_buffer</a>[<a href="ident?i=MAX_REPLIES">MAX_REPLIES</a>]; <a name=L67 href="source/kernel/blk_drv/floppy.c#L67">67</a> #define <a href="ident?i=ST0">ST0</a> (<a href="ident?i=reply_buffer">reply_buffer</a>[0]) <a name=L68 href="source/kernel/blk_drv/floppy.c#L68">68</a> #define <a href="ident?i=ST1">ST1</a> (<a href="ident?i=reply_buffer">reply_buffer</a>[1]) <a name=L69 href="source/kernel/blk_drv/floppy.c#L69">69</a> #define <a href="ident?i=ST2">ST2</a> (<a href="ident?i=reply_buffer">reply_buffer</a>[2]) <a name=L70 href="source/kernel/blk_drv/floppy.c#L70">70</a> #define <a href="ident?i=ST3">ST3</a> (<a href="ident?i=reply_buffer">reply_buffer</a>[3]) <a name=L71 href="source/kernel/blk_drv/floppy.c#L71">71</a> <a name=L72 href="source/kernel/blk_drv/floppy.c#L72">72</a> <b><i>/*</i></b> <a name=L73 href="source/kernel/blk_drv/floppy.c#L73">73</a> <b><i> * This struct defines the different floppy types. Unlike minix</i></b> <a name=L74 href="source/kernel/blk_drv/floppy.c#L74">74</a> <b><i> * linux doesn't have a "search for right type"-type, as the code</i></b> <a name=L75 href="source/kernel/blk_drv/floppy.c#L75">75</a> <b><i> * for that is convoluted and weird. I've got enough problems with</i></b> <a name=L76 href="source/kernel/blk_drv/floppy.c#L76">76</a> <b><i> * this driver as it is.</i></b> <a name=L77 href="source/kernel/blk_drv/floppy.c#L77">77</a> <b><i> *</i></b> <a name=L78 href="source/kernel/blk_drv/floppy.c#L78">78</a> <b><i> * The 'stretch' tells if the tracks need to be boubled for some</i></b> <a name=L79 href="source/kernel/blk_drv/floppy.c#L79">79</a> <b><i> * types (ie 360kB diskette in 1.2MB drive etc). Others should</i></b> <a name=L80 href="source/kernel/blk_drv/floppy.c#L80">80</a> <b><i> * be self-explanatory.</i></b> <a name=L81 href="source/kernel/blk_drv/floppy.c#L81">81</a> <b><i> */</i></b> <a name=L82 href="source/kernel/blk_drv/floppy.c#L82">82</a> static struct <a href="ident?i=floppy_struct">floppy_struct</a> { <a name=L83 href="source/kernel/blk_drv/floppy.c#L83">83</a> unsigned int size, sect, <a href="ident?i=head">head</a>, <a href="ident?i=track">track</a>, stretch; <a name=L84 href="source/kernel/blk_drv/floppy.c#L84">84</a> unsigned char gap,rate,spec1; <a name=L85 href="source/kernel/blk_drv/floppy.c#L85">85</a> } <a href="ident?i=floppy_type">floppy_type</a>[] = { <a name=L86 href="source/kernel/blk_drv/floppy.c#L86">86</a> { 0, 0,0, 0,0,0x00,0x00,0x00 }, <b><i>/* no testing */</i></b> <a name=L87 href="source/kernel/blk_drv/floppy.c#L87">87</a> { 720, 9,2,40,0,0x2A,0x02,0xDF }, <b><i>/* 360kB PC diskettes */</i></b> <a name=L88 href="source/kernel/blk_drv/floppy.c#L88">88</a> { 2400,15,2,80,0,0x1B,0x00,0xDF }, <b><i>/* 1.2 MB AT-diskettes */</i></b> <a name=L89 href="source/kernel/blk_drv/floppy.c#L89">89</a> { 720, 9,2,40,1,0x2A,0x02,0xDF }, <b><i>/* 360kB in 720kB drive */</i></b> <a name=L90 href="source/kernel/blk_drv/floppy.c#L90">90</a> { 1440, 9,2,80,0,0x2A,0x02,0xDF }, <b><i>/* 3.5" 720kB diskette */</i></b> <a name=L91 href="source/kernel/blk_drv/floppy.c#L91">91</a> { 720, 9,2,40,1,0x23,0x01,0xDF }, <b><i>/* 360kB in 1.2MB drive */</i></b> <a name=L92 href="source/kernel/blk_drv/floppy.c#L92">92</a> { 1440, 9,2,80,0,0x23,0x01,0xDF }, <b><i>/* 720kB in 1.2MB drive */</i></b> <a name=L93 href="source/kernel/blk_drv/floppy.c#L93">93</a> { 2880,18,2,80,0,0x1B,0x00,0xCF }, <b><i>/* 1.44MB diskette */</i></b> <a name=L94 href="source/kernel/blk_drv/floppy.c#L94">94</a> }; <a name=L95 href="source/kernel/blk_drv/floppy.c#L95">95</a> <b><i>/*</i></b>⌨️ 快捷键说明
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