struct_ccw1(9) centos man page | unix.com

STRUCT 
CCW1(9)							    The ccw bus 						    STRUCT CCW1(9)

NAME
       struct_ccw1 - channel command word

SYNOPSIS
       struct ccw1 {
	 __u8 cmd_code;
	 __u8 flags;
	 __u16 count;
	 __u32 cda;
       };

MEMBERS
       cmd_code
	   command code

       flags
	   flags, like IDA addressing, etc.

       count
	   byte count

       cda
	   data address

DESCRIPTION
       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.

AUTHOR
       Cornelia Huck <cornelia.huck@de.ibm.com>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							    STRUCT CCW1(9)