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<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 V1.75.2" /><link rel="home" href="index.html" title="Writing s390 channel device drivers" /><link rel="up" href="ch02.html#channelIO" title="I/O functions for channel-attached devices" /><link rel="prev" href="ch02.html" title="Chapter 2. The ccw bus" /><link rel="next" href="re02.html" title="struct erw" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>struct ccw1</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02.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="re02.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="struct ccw1"><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" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
struct ccw1 {
__u8 cmd_code;
__u8 flags;
__u16 count;
__u32 cda;
}; </pre></div><div class="refsect1" title="Members"><a id="id3040972"></a><h2>Members</h2><div class="variablelist"><dl><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 adressing, 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" title="Description"><a id="id3041027"></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="ch02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#channelIO">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re02.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>struct erw</span></td></tr></table></div></body></html>
