<?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>struct ccw1</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Writing s390 channel device drivers" /><link rel="up" href="ccw.html#channelIO" title="I/O functions for channel-attached devices" /><link rel="prev" href="ccw.html" title="Chapter 2. The ccw bus" /><link rel="next" href="API-struct-erw.html" title="struct erw" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct ccw1</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ccw.html">Prev</a> </td><th width="60%" align="center">I/O functions for channel-attached devices</th><td width="20%" align="right"> <a accesskey="n" href="API-struct-erw.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-struct-ccw1"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct ccw1 — channel command word </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting"> struct ccw1 { __u8 cmd_code; __u8 flags; __u16 count; __u32 cda; }; </pre></div><div class="refsect1"><a id="idm139815630771376"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">cmd_code</span></dt><dd><p> command code </p></dd><dt><span class="term">flags</span></dt><dd><p> flags, like IDA addressing, etc. </p></dd><dt><span class="term">count</span></dt><dd><p> byte count </p></dd><dt><span class="term">cda</span></dt><dd><p> data address </p></dd></dl></div></div><div class="refsect1"><a id="idm139815631168304"></a><h2>Description</h2><p> The ccw is the basic structure to build channel programs that perform operations with the device or the control unit. Only Format-1 channel command words are supported. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ccw.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ccw.html#channelIO">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-struct-erw.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. The ccw bus </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">struct erw</span></td></tr></table></div></body></html>