b7a308e562
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
#
|
|
# Copyright (c) 1998 Doug Rabson
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
#include <sys/bus.h>
|
|
|
|
INTERFACE device;
|
|
|
|
#
|
|
# Default implementations of some methods.
|
|
#
|
|
CODE {
|
|
static int null_shutdown(device_t dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int null_suspend(device_t dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int null_resume(device_t dev)
|
|
{
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
#
|
|
# Probe to see if the device is present. Return 0 if the device exists,
|
|
# ENXIO if it cannot be found. If some other error happens during the
|
|
# probe (such as a memory allocation failure), an appropriate error code
|
|
# should be returned. For cases where more than one driver matches a
|
|
# device, a priority value can be returned. In this case, success codes
|
|
# are values less than or equal to zero with the highest value representing
|
|
# the best match. Failure codes are represented by positive values and
|
|
# the regular unix error codes should be used for the purpose.
|
|
|
|
# If a driver returns a success code which is less than zero, it must
|
|
# not assume that it will be the same driver which is attached to the
|
|
# device. In particular, it must not assume that any values stored in
|
|
# the softc structure will be available for its attach method and any
|
|
# resources allocated during probe must be released and re-allocated
|
|
# if the attach method is called. If a success code of zero is
|
|
# returned, the driver can assume that it will be the one attached.
|
|
#
|
|
# Devices which implement busses should use this method to probe for
|
|
# the existence of devices attached to the bus and add them as
|
|
# children. If this is combined with the use of bus_generic_attach,
|
|
# the child devices will be automatically probed and attached.
|
|
#
|
|
METHOD int probe {
|
|
device_t dev;
|
|
};
|
|
|
|
#
|
|
# Called by a parent bus to add new devices to the bus.
|
|
#
|
|
STATICMETHOD void identify {
|
|
driver_t *driver;
|
|
device_t parent;
|
|
};
|
|
|
|
#
|
|
# Attach a device to the system. The probe method will have been
|
|
# called and will have indicated that the device exists. This routine
|
|
# should initialise the hardware and allocate other system resources
|
|
# (such as devfs entries). Returns 0 on success.
|
|
#
|
|
METHOD int attach {
|
|
device_t dev;
|
|
};
|
|
|
|
#
|
|
# Detach a device. This can be called if the user is replacing the
|
|
# driver software or if a device is about to be physically removed
|
|
# from the system (e.g. for pccard devices). Returns 0 on success.
|
|
#
|
|
METHOD int detach {
|
|
device_t dev;
|
|
};
|
|
|
|
#
|
|
# This is called during system shutdown to allow the driver to put the
|
|
# hardware into a consistent state for rebooting the computer.
|
|
#
|
|
METHOD int shutdown {
|
|
device_t dev;
|
|
} DEFAULT null_shutdown;
|
|
|
|
#
|
|
# This is called by the power-management subsystem when a suspend has been
|
|
# requested by the user or by some automatic mechanism. This gives
|
|
# drivers a chance to veto the suspend or save their configuration before
|
|
# power is removed.
|
|
#
|
|
METHOD int suspend {
|
|
device_t dev;
|
|
} DEFAULT null_suspend;
|
|
|
|
METHOD int resume {
|
|
device_t dev;
|
|
} DEFAULT null_resume;
|