<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Chiplevel hardware encapsulation</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux generic IRQ handling" /><link rel="up" href="ch04.html" title="Chapter 4. Abstraction layers" /><link rel="prev" href="ch04s03.html" title="Highlevel IRQ flow handlers" /><link rel="next" href="ch05.html" title="Chapter 5. __do_IRQ entry point" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chiplevel hardware encapsulation</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a> </td><th width="60%" align="center">Chapter 4. Abstraction layers</th><td width="20%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Chiplevel hardware encapsulation"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Chiplevel_hardware_encapsulation"></a>Chiplevel hardware encapsulation</h2></div></div></div><p> The chip level hardware descriptor structure irq_chip contains all the direct chip relevant functions, which can be utilized by the irq flow implementations. </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>ack()</p></li><li class="listitem"><p>mask_ack() - Optional, recommended for performance</p></li><li class="listitem"><p>mask()</p></li><li class="listitem"><p>unmask()</p></li><li class="listitem"><p>retrigger() - Optional</p></li><li class="listitem"><p>set_type() - Optional</p></li><li class="listitem"><p>set_wake() - Optional</p></li></ul></div><p> These primitives are strictly intended to mean what they say: ack means ACK, masking means masking of an IRQ line, etc. It is up to the flow handler(s) to use these basic units of lowlevel functionality. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Highlevel IRQ flow handlers </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 5. __do_IRQ entry point</td></tr></table></div></body></html>
