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f7b7769172
non-device code. * Re-implement the method dispatch to improve efficiency. The new system takes about 40ns for a method dispatch on a 300Mhz PII which is only 10ns slower than a direct function call on the same hardware. This changes the new-bus ABI slightly so make sure you re-compile any driver modules which you use.
128 lines
4.1 KiB
Objective-C
128 lines
4.1 KiB
Objective-C
#
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# Copyright (c) 1998 Doug Rabson
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/bus.h>
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INTERFACE device;
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#
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# Default implementations of some methods.
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#
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CODE {
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static int null_shutdown(device_t dev)
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{
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return 0;
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}
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static int null_suspend(device_t dev)
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{
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return 0;
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}
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static int null_resume(device_t dev)
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{
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return 0;
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}
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};
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#
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# Probe to see if the device is present. Return 0 if the device exists,
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# ENXIO if it cannot be found. If some other error happens during the
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# probe (such as a memory allocation failure), an appropriate error code
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# should be returned. For cases where more than one driver matches a
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# device, a priority value can be returned. In this case, success codes
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# are values less than or equal to zero with the highest value representing
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# the best match. Failure codes are represented by positive values and
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# the regular unix error codes should be used for the purpose.
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# If a driver returns a success code which is less than zero, it must
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# not assume that it will be the same driver which is attached to the
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# device. In particular, it must not assume that any values stored in
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# the softc structure will be available for its attach method and any
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# resources allocated during probe must be released and re-allocated
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# if the attach method is called. If a success code of zero is
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# returned, the driver can assume that it will be the one attached.
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#
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# Devices which implement busses should use this method to probe for
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# the existence of devices attached to the bus and add them as
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# children. If this is combined with the use of bus_generic_attach,
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# the child devices will be automatically probed and attached.
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#
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METHOD int probe {
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device_t dev;
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};
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#
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# Called by a parent bus to add new devices to the bus.
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#
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STATICMETHOD void identify {
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driver_t *driver;
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device_t parent;
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};
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#
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# Attach a device to the system. The probe method will have been
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# called and will have indicated that the device exists. This routine
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# should initialise the hardware and allocate other system resources
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# (such as devfs entries). Returns 0 on success.
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#
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METHOD int attach {
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device_t dev;
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};
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#
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# Detach a device. This can be called if the user is replacing the
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# driver software or if a device is about to be physically removed
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# from the system (e.g. for pccard devices). Returns 0 on success.
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#
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METHOD int detach {
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device_t dev;
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};
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#
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# This is called during system shutdown to allow the driver to put the
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# hardware into a consistent state for rebooting the computer.
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#
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METHOD int shutdown {
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device_t dev;
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} DEFAULT null_shutdown;
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#
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# This is called by the power-management subsystem when a suspend has been
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# requested by the user or by some automatic mechanism. This gives
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# drivers a chance to veto the suspend or save their configuration before
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# power is removed.
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#
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METHOD int suspend {
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device_t dev;
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} DEFAULT null_suspend;
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METHOD int resume {
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device_t dev;
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} DEFAULT null_resume;
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