📄 rs_io.s

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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/chr_drv/rs_io.s</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/chr_drv/rs_io.s">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/chr_drv/">chr_drv</a>/<a href="source/kernel/chr_drv/rs_io.s">rs_io.s</a></h1><div align=center>    <b>版本:</b>   [<a href="source/kernel/chr_drv/rs_io.s?v=1.0">1.0</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.99.11">0.99.11</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.99">0.99</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.97">0.97</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.96a">0.96a</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.95">0.95</a>] [<a href="source/kernel/chr_drv/rs_io.s?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/chr_drv/rs_io.s?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/chr_drv/rs_io.s#L1">1</a> /*  <a name=L2 href="source/kernel/chr_drv/rs_io.s#L2">2</a>  *  linux/kernel/rs_io.s  <a name=L3 href="source/kernel/chr_drv/rs_io.s#L3">3</a>  *  <a name=L4 href="source/kernel/chr_drv/rs_io.s#L4">4</a>  *  (C) 1991  Linus Torvalds  <a name=L5 href="source/kernel/chr_drv/rs_io.s#L5">5</a>  */  <a name=L6 href="source/kernel/chr_drv/rs_io.s#L6">6</a>   <a name=L7 href="source/kernel/chr_drv/rs_io.s#L7">7</a> /*  <a name=L8 href="source/kernel/chr_drv/rs_io.s#L8">8</a>  *      rs_io.s  <a name=L9 href="source/kernel/chr_drv/rs_io.s#L9">9</a>  * <a name=L10 href="source/kernel/chr_drv/rs_io.s#L10">10</a>  * This module implements the rs232 io interrupts. <a name=L11 href="source/kernel/chr_drv/rs_io.s#L11">11</a>  */ <a name=L12 href="source/kernel/chr_drv/rs_io.s#L12">12</a>  <a name=L13 href="source/kernel/chr_drv/rs_io.s#L13">13</a> .text <a name=L14 href="source/kernel/chr_drv/rs_io.s#L14">14</a> .globl _rs1_interrupt,_rs2_interrupt <a name=L15 href="source/kernel/chr_drv/rs_io.s#L15">15</a>  <a name=L16 href="source/kernel/chr_drv/rs_io.s#L16">16</a> size    = 1024                          /* must be power of two ! <a name=L17 href="source/kernel/chr_drv/rs_io.s#L17">17</a>                                            and must match the value <a name=L18 href="source/kernel/chr_drv/rs_io.s#L18">18</a>                                            in tty_io.c!!! */ <a name=L19 href="source/kernel/chr_drv/rs_io.s#L19">19</a>  <a name=L20 href="source/kernel/chr_drv/rs_io.s#L20">20</a> /* these are the offsets into the read/write buffer structures */ <a name=L21 href="source/kernel/chr_drv/rs_io.s#L21">21</a> rs_addr = 0 <a name=L22 href="source/kernel/chr_drv/rs_io.s#L22">22</a> head = 4 <a name=L23 href="source/kernel/chr_drv/rs_io.s#L23">23</a> tail = 8 <a name=L24 href="source/kernel/chr_drv/rs_io.s#L24">24</a> proc_list = 12 <a name=L25 href="source/kernel/chr_drv/rs_io.s#L25">25</a> buf = 16 <a name=L26 href="source/kernel/chr_drv/rs_io.s#L26">26</a>  <a name=L27 href="source/kernel/chr_drv/rs_io.s#L27">27</a> startup = 256           /* chars left in write queue when we restart it */ <a name=L28 href="source/kernel/chr_drv/rs_io.s#L28">28</a>  <a name=L29 href="source/kernel/chr_drv/rs_io.s#L29">29</a> /* <a name=L30 href="source/kernel/chr_drv/rs_io.s#L30">30</a>  * These are the actual interrupt routines. They look where <a name=L31 href="source/kernel/chr_drv/rs_io.s#L31">31</a>  * the interrupt is coming from, and take appropriate action. <a name=L32 href="source/kernel/chr_drv/rs_io.s#L32">32</a>  */ <a name=L33 href="source/kernel/chr_drv/rs_io.s#L33">33</a> .align 2 <a name=L34 href="source/kernel/chr_drv/rs_io.s#L34">34</a> _rs1_interrupt: <a name=L35 href="source/kernel/chr_drv/rs_io.s#L35">35</a>         pushl $_table_list+8 <a name=L36 href="source/kernel/chr_drv/rs_io.s#L36">36</a>         jmp rs_int <a name=L37 href="source/kernel/chr_drv/rs_io.s#L37">37</a> .align 2 <a name=L38 href="source/kernel/chr_drv/rs_io.s#L38">38</a> _rs2_interrupt: <a name=L39 href="source/kernel/chr_drv/rs_io.s#L39">39</a>         pushl $_table_list+16 <a name=L40 href="source/kernel/chr_drv/rs_io.s#L40">40</a> rs_int: <a name=L41 href="source/kernel/chr_drv/rs_io.s#L41">41</a>         pushl %edx <a name=L42 href="source/kernel/chr_drv/rs_io.s#L42">42</a>         pushl %ecx <a name=L43 href="source/kernel/chr_drv/rs_io.s#L43">43</a>         pushl %ebx <a name=L44 href="source/kernel/chr_drv/rs_io.s#L44">44</a>         pushl %eax <a name=L45 href="source/kernel/chr_drv/rs_io.s#L45">45</a>         push %es <a name=L46 href="source/kernel/chr_drv/rs_io.s#L46">46</a>         push %ds                /* as this is an interrupt, we cannot */ <a name=L47 href="source/kernel/chr_drv/rs_io.s#L47">47</a>         pushl $0x10             /* know that bs is ok. Load it */ <a name=L48 href="source/kernel/chr_drv/rs_io.s#L48">48</a>         pop %ds <a name=L49 href="source/kernel/chr_drv/rs_io.s#L49">49</a>         pushl $0x10 <a name=L50 href="source/kernel/chr_drv/rs_io.s#L50">50</a>         pop %es <a name=L51 href="source/kernel/chr_drv/rs_io.s#L51">51</a>         movl 24(%esp),%edx <a name=L52 href="source/kernel/chr_drv/rs_io.s#L52">52</a>         movl (%edx),%edx <a name=L53 href="source/kernel/chr_drv/rs_io.s#L53">53</a>         movl rs_addr(%edx),%edx <a name=L54 href="source/kernel/chr_drv/rs_io.s#L54">54</a>         addl $2,%edx            /* interrupt ident. reg */ <a name=L55 href="source/kernel/chr_drv/rs_io.s#L55">55</a> rep_int: <a name=L56 href="source/kernel/chr_drv/rs_io.s#L56">56</a>         xorl %eax,%eax <a name=L57 href="source/kernel/chr_drv/rs_io.s#L57">57</a>         inb %dx,%al <a name=L58 href="source/kernel/chr_drv/rs_io.s#L58">58</a>         testb $1,%al <a name=L59 href="source/kernel/chr_drv/rs_io.s#L59">59</a>         jne end <a name=L60 href="source/kernel/chr_drv/rs_io.s#L60">60</a>         cmpb $6,%al             /* this shouldn't happen, but ... */ <a name=L61 href="source/kernel/chr_drv/rs_io.s#L61">61</a>         ja end <a name=L62 href="source/kernel/chr_drv/rs_io.s#L62">62</a>         movl 24(%esp),%ecx <a name=L63 href="source/kernel/chr_drv/rs_io.s#L63">63</a>         pushl %edx <a name=L64 href="source/kernel/chr_drv/rs_io.s#L64">64</a>         subl $2,%edx <a name=L65 href="source/kernel/chr_drv/rs_io.s#L65">65</a>         call jmp_table(,%eax,2)         /* NOTE! not *4, bit0 is 0 already */ <a name=L66 href="source/kernel/chr_drv/rs_io.s#L66">66</a>         popl %edx <a name=L67 href="source/kernel/chr_drv/rs_io.s#L67">67</a>         jmp rep_int <a name=L68 href="source/kernel/chr_drv/rs_io.s#L68">68</a> end:    movb $0x20,%al <a name=L69 href="source/kernel/chr_drv/rs_io.s#L69">69</a>         outb %al,$0x20          /* EOI */ <a name=L70 href="source/kernel/chr_drv/rs_io.s#L70">70</a>         pop %ds <a name=L71 href="source/kernel/chr_drv/rs_io.s#L71">71</a>         pop %es <a name=L72 href="source/kernel/chr_drv/rs_io.s#L72">72</a>         popl %eax <a name=L73 href="source/kernel/chr_drv/rs_io.s#L73">73</a>         popl %ebx <a name=L74 href="source/kernel/chr_drv/rs_io.s#L74">74</a>         popl %ecx <a name=L75 href="source/kernel/chr_drv/rs_io.s#L75">75</a>         popl %edx <a name=L76 href="source/kernel/chr_drv/rs_io.s#L76">76</a>         addl $4,%esp            # jump over _table_list entry <a name=L77 href="source/kernel/chr_drv/rs_io.s#L77">77</a>         iret <a name=L78 href="source/kernel/chr_drv/rs_io.s#L78">78</a>  <a name=L79 href="source/kernel/chr_drv/rs_io.s#L79">79</a> jmp_table: <a name=L80 href="source/kernel/chr_drv/rs_io.s#L80">80</a>         .long modem_status,write_char,read_char,line_status <a name=L81 href="source/kernel/chr_drv/rs_io.s#L81">81</a>  <a name=L82 href="source/kernel/chr_drv/rs_io.s#L82">82</a> .align 2 <a name=L83 href="source/kernel/chr_drv/rs_io.s#L83">83</a> modem_status: <a name=L84 href="source/kernel/chr_drv/rs_io.s#L84">84</a>         addl $6,%edx            /* clear intr by reading modem status reg */ <a name=L85 href="source/kernel/chr_drv/rs_io.s#L85">85</a>         inb %dx,%al <a name=L86 href="source/kernel/chr_drv/rs_io.s#L86">86</a>         ret <a name=L87 href="source/kernel/chr_drv/rs_io.s#L87">87</a>  <a name=L88 href="source/kernel/chr_drv/rs_io.s#L88">88</a> .align 2 <a name=L89 href="source/kernel/chr_drv/rs_io.s#L89">89</a> line_status: <a name=L90 href="source/kernel/chr_drv/rs_io.s#L90">90</a>         addl $5,%edx            /* clear intr by reading line status reg. */ <a name=L91 href="source/kernel/chr_drv/rs_io.s#L91">91</a>         inb %dx,%al <a name=L92 href="source/kernel/chr_drv/rs_io.s#L92">92</a>         ret <a name=L93 href="source/kernel/chr_drv/rs_io.s#L93">93</a>  <a name=L94 href="source/kernel/chr_drv/rs_io.s#L94">94</a> .align 2 <a name=L95 href="source/kernel/chr_drv/rs_io.s#L95">95</a> read_char: <a name=L96 href="source/kernel/chr_drv/rs_io.s#L96">96</a>         inb %dx,%al <a name=L97 href="source/kernel/chr_drv/rs_io.s#L97">97</a>         movl %ecx,%edx <a name=L98 href="source/kernel/chr_drv/rs_io.s#L98">98</a>         subl $_table_list,%edx <a name=L99 href="source/kernel/chr_drv/rs_io.s#L99">99</a>         shrl $3,%edx<a name=L100 href="source/kernel/chr_drv/rs_io.s#L100">100</a>         movl (%ecx),%ecx                # read-queue<a name=L101 href="source/kernel/chr_drv/rs_io.s#L101">101</a>         movl head(%ecx),%ebx<a name=L102 href="source/kernel/chr_drv/rs_io.s#L102">102</a>         movb %al,buf(%ecx,%ebx)<a name=L103 href="source/kernel/chr_drv/rs_io.s#L103">103</a>         incl %ebx<a name=L104 href="source/kernel/chr_drv/rs_io.s#L104">104</a>         andl $size-1,%ebx<a name=L105 href="source/kernel/chr_drv/rs_io.s#L105">105</a>         cmpl tail(%ecx),%ebx<a name=L106 href="source/kernel/chr_drv/rs_io.s#L106">106</a>         je 1f<a name=L107 href="source/kernel/chr_drv/rs_io.s#L107">107</a>         movl %ebx,head(%ecx)<a name=L108 href="source/kernel/chr_drv/rs_io.s#L108">108</a> 1:      pushl %edx<a name=L109 href="source/kernel/chr_drv/rs_io.s#L109">109</a>         call _do_tty_interrupt<a name=L110 href="source/kernel/chr_drv/rs_io.s#L110">110</a>         addl $4,%esp<a name=L111 href="source/kernel/chr_drv/rs_io.s#L111">111</a>         ret<a name=L112 href="source/kernel/chr_drv/rs_io.s#L112">112</a> <a name=L113 href="source/kernel/chr_drv/rs_io.s#L113">113</a> .align 2<a name=L114 href="source/kernel/chr_drv/rs_io.s#L114">114</a> write_char:<a name=L115 href="source/kernel/chr_drv/rs_io.s#L115">115</a>         movl 4(%ecx),%ecx               # write-queue<a name=L116 href="source/kernel/chr_drv/rs_io.s#L116">116</a>         movl head(%ecx),%ebx<a name=L117 href="source/kernel/chr_drv/rs_io.s#L117">117</a>         subl tail(%ecx),%ebx<a name=L118 href="source/kernel/chr_drv/rs_io.s#L118">118</a>         andl $size-1,%ebx               # nr chars in queue<a name=L119 href="source/kernel/chr_drv/rs_io.s#L119">119</a>         je write_buffer_empty<a name=L120 href="source/kernel/chr_drv/rs_io.s#L120">120</a>         cmpl $startup,%ebx<a name=L121 href="source/kernel/chr_drv/rs_io.s#L121">121</a>         ja 1f<a name=L122 href="source/kernel/chr_drv/rs_io.s#L122">122</a>         movl proc_list(%ecx),%ebx       # wake up sleeping process<a name=L123 href="source/kernel/chr_drv/rs_io.s#L123">123</a>         testl %ebx,%ebx                 # is there any?<a name=L124 href="source/kernel/chr_drv/rs_io.s#L124">124</a>         je 1f<a name=L125 href="source/kernel/chr_drv/rs_io.s#L125">125</a>         movl $0,(%ebx)<a name=L126 href="source/kernel/chr_drv/rs_io.s#L126">126</a> 1:      movl tail(%ecx),%ebx<a name=L127 href="source/kernel/chr_drv/rs_io.s#L127">127</a>         movb buf(%ecx,%ebx),%al<a name=L128 href="source/kernel/chr_drv/rs_io.s#L128">128</a>         outb %al,%dx<a name=L129 href="source/kernel/chr_drv/rs_io.s#L129">129</a>         incl %ebx<a name=L130 href="source/kernel/chr_drv/rs_io.s#L130">130</a>         andl $size-1,%ebx<a name=L131 href="source/kernel/chr_drv/rs_io.s#L131">131</a>         movl %ebx,tail(%ecx)<a name=L132 href="source/kernel/chr_drv/rs_io.s#L132">132</a>         cmpl head(%ecx),%ebx<a name=L133 href="source/kernel/chr_drv/rs_io.s#L133">133</a>         je write_buffer_empty<a name=L134 href="source/kernel/chr_drv/rs_io.s#L134">134</a>         ret<a name=L135 href="source/kernel/chr_drv/rs_io.s#L135">135</a> .align 2<a name=L136 href="source/kernel/chr_drv/rs_io.s#L136">136</a> write_buffer_empty:<a name=L137 href="source/kernel/chr_drv/rs_io.s#L137">137</a>         movl proc_list(%ecx),%ebx       # wake up sleeping process<a name=L138 href="source/kernel/chr_drv/rs_io.s#L138">138</a>         testl %ebx,%ebx                 # is there any?<a name=L139 href="source/kernel/chr_drv/rs_io.s#L139">139</a>         je 1f<a name=L140 href="source/kernel/chr_drv/rs_io.s#L140">140</a>         movl $0,(%ebx)<a name=L141 href="source/kernel/chr_drv/rs_io.s#L141">141</a> 1:      incl %edx<a name=L142 href="source/kernel/chr_drv/rs_io.s#L142">142</a>         inb %dx,%al<a name=L143 href="source/kernel/chr_drv/rs_io.s#L143">143</a>         jmp 1f<a name=L144 href="source/kernel/chr_drv/rs_io.s#L144">144</a> 1:      jmp 1f<a name=L145 href="source/kernel/chr_drv/rs_io.s#L145">145</a> 1:      andb $0xd,%al           /* disable transmit interrupt */<a name=L146 href="source/kernel/chr_drv/rs_io.s#L146">146</a>         outb %al,%dx<a name=L147 href="source/kernel/chr_drv/rs_io.s#L147">147</a>         ret</pre><hr><div align=center>   [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/chr_drv/rs_io.s">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><hr>本网页由 <a href="http:blurb.html">LXR引擎</a> 自动生成.<br></html>
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