STRUCT IRB(9) The ccw bus STRUCT IRB(9)NAMEstruct_irb - interruption response block
SYNOPSIS
struct irb {
union scsw scsw;
union esw;
__u8 ecw[32];
};
MEMBERS
scsw
subchannel status word
esw
extened status word
ecw[32]
extended control word
DESCRIPTION
The irb that is handed to the device driver when an interrupt occurs.
For solicited interrupts, the common I/O layer already performs checks
whether a field is valid; a field not being valid is always passed as
0. If a unit check occured, ecw may contain sense data; this is
retrieved by the common I/O layer itself if the device doesn´t support
concurrent sense (so that the device driver never needs to perform
basic sene itself). For unsolicited interrupts, the irb is passed as-is
(expect for sense data, if applicable).
AUTHOR
Cornelia Huck <cornelia.huck@de.ibm.com>
Author.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 STRUCT IRB(9)
