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    1: .\" -*- nroff -*-
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    3: .\" Copyright (c) 1998 Doug Rabson
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   29: .\" $FreeBSD: src/share/man/man9/BUS_READ_IVAR.9,v 1.3.2.4 2001/12/17 11:30:18 ru Exp $
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   32: .Dd June 16, 1998
   33: .Dt BUS_READ_IVAR 9
   34: .Os
   35: .Sh NAME
   36: .Nm BUS_READ_IVAR ,
   37: .Nm BUS_WRITE_IVAR
   38: .Nd manipulate bus-specific device instance variables
   39: .Sh SYNOPSIS
   40: .In sys/param.h
   41: .In sys/bus.h
   42: .Ft int
   43: .Fn BUS_READ_IVAR "device_t dev" "device_t child" "int index" "uintptr_t *result"
   44: .Ft int
   45: .Fn BUS_WRITE_IVAR "device_t dev" "device_t child" "int index" "uintptr_t value"
   46: .Sh DESCRIPTION
   47: These two methods manage a bus specific set of instance variables of
   48: a child device.  The intention is that each different type of bus
   49: defines a set of appropriate instance variables (such as ports and
   50: irqs for ISA bus etc.)
   51: .Pp
   52: This information could be given to the child device as a struct but
   53: that makes it hard for a bus to add or remove variables without
   54: forcing an edit and recompile for all drivers which may not be
   55: possible for vendor supplied binary drivers.
   56: .Sh RETURN VALUES
   57: Zero is returned on success, otherwise an appropriate error is returned.
   58: .Sh SEE ALSO
   59: .Xr device 9 ,
   60: .Xr driver 9
   61: .Sh AUTHORS
   62: This man page was written by
   63: .An Doug Rabson .