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DRIVER_MODULE(9)	 BSD Kernel Developer's	Manual	      DRIVER_MODULE(9)

     DRIVER_MODULE -- kernel driver declaration	macro

     #include <sys/param.h>
     #include <sys/kernel.h>
     #include <sys/bus.h>
     #include <sys/module.h>

     DRIVER_MODULE(name, busname, driver_t driver, devclass_t devclass,
	 modeventhand_t	evh, void *arg);

     The DRIVER_MODULE() macro declares	a kernel driver.  DRIVER_MODULE() ex-
     pands to the real driver declaration, where the phrase name is used as
     the naming	prefix for the driver and its functions.  Note that it is sup-
     plied as plain text, and not a char or char *.

     busname is	the parent bus of the driver (PCI, ISA,	PPBUS and others),
     e.g. `pci', `isa',	or `ppbus'.

     The identifier used in DRIVER_MODULE() can	be different from the driver
     name.  Also, the same driver identifier can exist on different busses,
     which is a	pretty clean way of making front ends for different cards us-
     ing the same driver on the	same or	different busses.  For example,	the
     following is allowed:

     DRIVER_MODULE(foo,	isa, foo_driver, foo_devclass, NULL, NULL);

     DRIVER_MODULE(foo,	pci, foo_driver, foo_devclass, NULL, NULL);

     driver is the driver of type driver_t, which contains the information
     about the driver and is therefore one of the two most important parts of
     the call to DRIVER_MODULE().

     The devclass argument contains the	kernel-internal	information about the
     device, which will	be used	within the kernel driver module.

     The evh argument is the event handler which is called when	the driver (or
     module) is	loaded or unloaded (see	module(9)).

     The arg is	unused at this time and	should be a NULL pointer.

     device(9),	driver(9), module(9)

     This manual page was written by Alexander Langer <>.

BSD				August 27, 2011				   BSD


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