📄 serial.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/chr_drv/serial.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/chr_drv/serial.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/chr_drv/">chr_drv</a>/<a href="source/kernel/chr_drv/serial.c">serial.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/chr_drv/serial.c?v=1.0">1.0</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.99">0.99</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.97">0.97</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.96a">0.96a</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.95">0.95</a>] [<a href="source/kernel/chr_drv/serial.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/chr_drv/serial.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/chr_drv/serial.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/chr_drv/serial.c#L2">2</a> <b><i> * linux/kernel/serial.c</i></b> <a name=L3 href="source/kernel/chr_drv/serial.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/chr_drv/serial.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/kernel/chr_drv/serial.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/chr_drv/serial.c#L6">6</a> <a name=L7 href="source/kernel/chr_drv/serial.c#L7">7</a> <b><i>/*</i></b> <a name=L8 href="source/kernel/chr_drv/serial.c#L8">8</a> <b><i> * serial.c</i></b> <a name=L9 href="source/kernel/chr_drv/serial.c#L9">9</a> <b><i> *</i></b> <a name=L10 href="source/kernel/chr_drv/serial.c#L10">10</a> <b><i> * This module implements the rs232 io functions</i></b> <a name=L11 href="source/kernel/chr_drv/serial.c#L11">11</a> <b><i> * void rs_write(struct tty_struct * queue);</i></b> <a name=L12 href="source/kernel/chr_drv/serial.c#L12">12</a> <b><i> * void rs_init(void);</i></b> <a name=L13 href="source/kernel/chr_drv/serial.c#L13">13</a> <b><i> * and all interrupts pertaining to serial IO.</i></b> <a name=L14 href="source/kernel/chr_drv/serial.c#L14">14</a> <b><i> */</i></b> <a name=L15 href="source/kernel/chr_drv/serial.c#L15">15</a> <a name=L16 href="source/kernel/chr_drv/serial.c#L16">16</a> #include <linux/tty.h> <a name=L17 href="source/kernel/chr_drv/serial.c#L17">17</a> #include <linux/sched.h> <a name=L18 href="source/kernel/chr_drv/serial.c#L18">18</a> #include <asm/system.h> <a name=L19 href="source/kernel/chr_drv/serial.c#L19">19</a> #include <asm/io.h> <a name=L20 href="source/kernel/chr_drv/serial.c#L20">20</a> <a name=L21 href="source/kernel/chr_drv/serial.c#L21">21</a> #define <a href="ident?i=WAKEUP_CHARS">WAKEUP_CHARS</a> (<a href="ident?i=TTY_BUF_SIZE">TTY_BUF_SIZE</a>/4) <a name=L22 href="source/kernel/chr_drv/serial.c#L22">22</a> <a name=L23 href="source/kernel/chr_drv/serial.c#L23">23</a> extern void <a href="ident?i=rs1_interrupt">rs1_interrupt</a>(void); <a name=L24 href="source/kernel/chr_drv/serial.c#L24">24</a> extern void <a href="ident?i=rs2_interrupt">rs2_interrupt</a>(void); <a name=L25 href="source/kernel/chr_drv/serial.c#L25">25</a> <a name=L26 href="source/kernel/chr_drv/serial.c#L26">26</a> static void <a href="ident?i=init">init</a>(int port) <a name=L27 href="source/kernel/chr_drv/serial.c#L27">27</a> { <a name=L28 href="source/kernel/chr_drv/serial.c#L28">28</a> <a href="ident?i=outb_p">outb_p</a>(0x80,port+3); <b><i>/* set DLAB of line control reg */</i></b> <a name=L29 href="source/kernel/chr_drv/serial.c#L29">29</a> <a href="ident?i=outb_p">outb_p</a>(0x30,port); <b><i>/* LS of divisor (48 -> 2400 bps */</i></b> <a name=L30 href="source/kernel/chr_drv/serial.c#L30">30</a> <a href="ident?i=outb_p">outb_p</a>(0x00,port+1); <b><i>/* MS of divisor */</i></b> <a name=L31 href="source/kernel/chr_drv/serial.c#L31">31</a> <a href="ident?i=outb_p">outb_p</a>(0x03,port+3); <b><i>/* reset DLAB */</i></b> <a name=L32 href="source/kernel/chr_drv/serial.c#L32">32</a> <a href="ident?i=outb_p">outb_p</a>(0x0b,port+4); <b><i>/* set DTR,RTS, OUT_2 */</i></b> <a name=L33 href="source/kernel/chr_drv/serial.c#L33">33</a> <a href="ident?i=outb_p">outb_p</a>(0x0d,port+1); <b><i>/* enable all intrs but writes */</i></b> <a name=L34 href="source/kernel/chr_drv/serial.c#L34">34</a> (void)<a href="ident?i=inb">inb</a>(port); <b><i>/* read data port to reset things (?) */</i></b> <a name=L35 href="source/kernel/chr_drv/serial.c#L35">35</a> } <a name=L36 href="source/kernel/chr_drv/serial.c#L36">36</a> <a name=L37 href="source/kernel/chr_drv/serial.c#L37">37</a> void <a href="ident?i=rs_init">rs_init</a>(void) <a name=L38 href="source/kernel/chr_drv/serial.c#L38">38</a> { <a name=L39 href="source/kernel/chr_drv/serial.c#L39">39</a> <a href="ident?i=set_intr_gate">set_intr_gate</a>(0x24,<a href="ident?i=rs1_interrupt">rs1_interrupt</a>); <a name=L40 href="source/kernel/chr_drv/serial.c#L40">40</a> <a href="ident?i=set_intr_gate">set_intr_gate</a>(0x23,<a href="ident?i=rs2_interrupt">rs2_interrupt</a>); <a name=L41 href="source/kernel/chr_drv/serial.c#L41">41</a> <a href="ident?i=init">init</a>(<a href="ident?i=tty_table">tty_table</a>[1].read_q.data); <a name=L42 href="source/kernel/chr_drv/serial.c#L42">42</a> <a href="ident?i=init">init</a>(<a href="ident?i=tty_table">tty_table</a>[2].read_q.data); <a name=L43 href="source/kernel/chr_drv/serial.c#L43">43</a> <a href="ident?i=outb">outb</a>(<a href="ident?i=inb_p">inb_p</a>(0x21)&0xE7,0x21); <a name=L44 href="source/kernel/chr_drv/serial.c#L44">44</a> } <a name=L45 href="source/kernel/chr_drv/serial.c#L45">45</a> <a name=L46 href="source/kernel/chr_drv/serial.c#L46">46</a> <b><i>/*</i></b> <a name=L47 href="source/kernel/chr_drv/serial.c#L47">47</a> <b><i> * This routine gets called when tty_write has put something into</i></b> <a name=L48 href="source/kernel/chr_drv/serial.c#L48">48</a> <b><i> * the write_queue. It must check wheter the queue is empty, and</i></b> <a name=L49 href="source/kernel/chr_drv/serial.c#L49">49</a> <b><i> * set the interrupt register accordingly</i></b> <a name=L50 href="source/kernel/chr_drv/serial.c#L50">50</a> <b><i> *</i></b> <a name=L51 href="source/kernel/chr_drv/serial.c#L51">51</a> <b><i> * void _rs_write(struct tty_struct * tty);</i></b> <a name=L52 href="source/kernel/chr_drv/serial.c#L52">52</a> <b><i> */</i></b> <a name=L53 href="source/kernel/chr_drv/serial.c#L53">53</a> void <a href="ident?i=rs_write">rs_write</a>(struct <a href="ident?i=tty_struct">tty_struct</a> * tty) <a name=L54 href="source/kernel/chr_drv/serial.c#L54">54</a> { <a name=L55 href="source/kernel/chr_drv/serial.c#L55">55</a> <a href="ident?i=cli">cli</a>(); <a name=L56 href="source/kernel/chr_drv/serial.c#L56">56</a> if (!<a href="ident?i=EMPTY">EMPTY</a>(tty->write_q)) <a name=L57 href="source/kernel/chr_drv/serial.c#L57">57</a> <a href="ident?i=outb">outb</a>(<a href="ident?i=inb_p">inb_p</a>(tty->write_q.data+1)|0x02,tty->write_q.data+1); <a name=L58 href="source/kernel/chr_drv/serial.c#L58">58</a> <a href="ident?i=sti">sti</a>(); <a name=L59 href="source/kernel/chr_drv/serial.c#L59">59</a> } <a name=L60 href="source/kernel/chr_drv/serial.c#L60">60</a> </pre><hr><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/chr_drv/serial.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><hr>本网页由 <a href="http:blurb.html">LXR引擎</a> 自动生成.<br></html>⌨️ 快捷键说明
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