897cd717a5
work in progress and has never booted a real machine. Initial development and testing was done using SimOS (see http://simos.stanford.edu for details). On the SimOS simulator, this port successfully reaches single-user mode and has been tested with loads as high as one copy of /bin/ls :-). Obtained from: partly from NetBSD/alpha
855 lines
17 KiB
C
855 lines
17 KiB
C
/*-
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* Copyright (c) 1997 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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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus_private.h>
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#include <sys/systm.h>
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device_t
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bus_get_device(bus_t bus)
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{
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return bus->dev;
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}
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void
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bus_print_device(bus_t bus, device_t dev)
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{
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printf("%s%d", device_get_name(dev), device_get_unit(dev));
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if (device_is_alive(dev)) {
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if (device_get_desc(dev))
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printf(": <%s>", device_get_desc(dev));
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bus->ops->print_device(bus, dev);
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} else
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printf(" not found");
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printf("\n");
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}
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int
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bus_read_ivar(bus_t bus, device_t dev,
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int index, u_long *result)
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{
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return bus->ops->read_ivar(bus, dev, index, result);
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}
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int
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bus_write_ivar(bus_t bus, device_t dev,
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int index, u_long value)
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{
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return bus->ops->write_ivar(bus, dev, index, value);
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}
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int
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bus_map_intr(bus_t bus, device_t dev, driver_intr_t *intr, void *arg)
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{
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return bus->ops->map_intr(bus, dev, intr, arg);
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}
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static devclass_list_t devclasses;
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static void
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devclass_init(void)
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{
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TAILQ_INIT(&devclasses);
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}
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static devclass_t
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devclass_find_internal(const char *classname, int create)
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{
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devclass_t dc;
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for (dc = TAILQ_FIRST(&devclasses); dc; dc = TAILQ_NEXT(dc, link))
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if (!strcmp(dc->name, classname))
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return dc;
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if (create) {
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dc = malloc(sizeof(struct devclass) + strlen(classname) + 1,
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M_DEVBUF, M_NOWAIT);
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if (!dc)
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return NULL;
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dc->name = (char*) (dc + 1);
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strcpy(dc->name, classname);
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dc->devices = NULL;
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dc->maxunit = 0;
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dc->nextunit = 0;
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TAILQ_INIT(&dc->drivers);
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TAILQ_INSERT_TAIL(&devclasses, dc, link);
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}
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return dc;
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}
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devclass_t
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devclass_find(const char *classname)
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{
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return devclass_find_internal(classname, FALSE);
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}
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int
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devclass_add_driver(devclass_t dc, driver_t *driver)
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{
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/*
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* Make sure the devclass which the driver is implementing exists.
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*/
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devclass_find_internal(driver->name, TRUE);
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TAILQ_INSERT_TAIL(&dc->drivers, driver, link);
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return 0;
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}
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int
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devclass_delete_driver(devclass_t dc, driver_t *driver)
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{
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bus_t bus;
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device_t dev;
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int i;
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int error;
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/*
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* Disassociate from any devices. We iterate through all the
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* devices attached to any bus in this class.
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*/
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for (i = 0; i < dc->maxunit; i++) {
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if (dc->devices[i]) {
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bus = dc->devices[i]->softc;
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for (dev = TAILQ_FIRST(&bus->devices); dev;
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dev = TAILQ_NEXT(dev, link))
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if (dev->driver == driver) {
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if (error = device_detach(dev))
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return error;
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device_set_driver(dev, NULL);
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}
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}
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}
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TAILQ_REMOVE(&dc->drivers, driver, link);
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return 0;
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}
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driver_t *
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devclass_find_driver(devclass_t dc, const char *classname)
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{
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driver_t *driver;
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for (driver = TAILQ_FIRST(&dc->drivers); driver;
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driver = TAILQ_NEXT(driver, link))
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if (!strcmp(driver->name, classname))
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return driver;
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return NULL;
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}
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const char *
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devclass_get_name(devclass_t dc)
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{
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return dc->name;
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}
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device_t
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devclass_get_device(devclass_t dc, int unit)
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{
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if (unit < 0 || unit >= dc->maxunit)
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return NULL;
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return dc->devices[unit];
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}
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void *
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devclass_get_softc(devclass_t dc, int unit)
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{
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device_t dev;
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if (unit < 0 || unit >= dc->maxunit)
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return NULL;
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dev = dc->devices[unit];
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if (!dev || dev->state < DS_ATTACHED)
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return NULL;
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return dev->softc;
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}
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int
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devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
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{
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int i;
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int count;
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device_t dev;
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device_t *list;
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count = 0;
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for (i = 0; i < dc->maxunit; i++)
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if (dc->devices[i])
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count++;
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list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT);
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if (!list)
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return ENOMEM;
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count = 0;
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for (i = 0; i < dc->maxunit; i++)
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if (dc->devices[i]) {
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list[count] = dc->devices[i];
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count++;
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}
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*devlistp = list;
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*devcountp = count;
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return 0;
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}
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int
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devclass_get_maxunit(devclass_t dc)
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{
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return dc->maxunit;
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}
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static int
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devclass_alloc_unit(devclass_t dc, int *unitp)
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{
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int unit = *unitp;
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/*
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* If we have been given a wired unit number, check for existing
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* device.
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*/
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if (unit != -1) {
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device_t dev;
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dev = devclass_get_device(dc, unit);
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if (dev) {
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printf("devclass_alloc_unit: %s%d already exists, using next available unit number\n", dc->name, unit);
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unit = -1;
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}
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}
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if (unit == -1) {
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unit = dc->nextunit;
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dc->nextunit++;
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} else if (dc->nextunit <= unit)
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dc->nextunit = unit + 1;
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if (unit >= dc->maxunit) {
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device_t *newlist;
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int newsize;
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newsize = (dc->maxunit ? 2 * dc->maxunit
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: MINALLOCSIZE / sizeof(device_t));
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newlist = malloc(sizeof(device_t) * newsize, M_DEVBUF, M_NOWAIT);
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if (!newlist)
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return ENOMEM;
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bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
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bzero(newlist + dc->maxunit,
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sizeof(device_t) * (newsize - dc->maxunit));
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if (dc->devices)
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free(dc->devices, M_DEVBUF);
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dc->devices = newlist;
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dc->maxunit = newsize;
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}
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*unitp = unit;
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return 0;
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}
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static int
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devclass_add_device(devclass_t dc, device_t dev)
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{
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int error;
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if (error = devclass_alloc_unit(dc, &dev->unit))
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return error;
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dc->devices[dev->unit] = dev;
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dev->devclass = dc;
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return 0;
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}
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static int
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devclass_delete_device(devclass_t dc, device_t dev)
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{
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if (dev->devclass != dc
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|| dc->devices[dev->unit] != dev)
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panic("devclass_delete_device: inconsistent device class");
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dc->devices[dev->unit] = NULL;
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if (dev->flags & DF_WILDCARD)
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dev->unit = -1;
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dev->devclass = NULL;
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while (dc->nextunit > 0 && dc->devices[dc->nextunit - 1] == NULL)
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dc->nextunit--;
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return 0;
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}
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static device_t
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make_device(bus_t bus, const char *name,
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int unit, void *ivars)
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{
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driver_t *driver;
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device_t dev;
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devclass_t dc;
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int error;
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if (name) {
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dc = devclass_find_internal(name, TRUE);
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if (!dc) {
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printf("make_device: can't find device class %s\n", name);
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return NULL;
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}
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if (error = devclass_alloc_unit(dc, &unit))
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return NULL;
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} else
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dc = NULL;
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dev = malloc(sizeof(struct device), M_DEVBUF, M_NOWAIT);
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if (!dev)
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return 0;
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dev->parent = bus;
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dev->driver = NULL;
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dev->devclass = dc;
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dev->unit = unit;
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dev->desc = NULL;
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dev->busy = 0;
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dev->flags = DF_ENABLED;
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if (unit == -1)
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dev->flags |= DF_WILDCARD;
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if (name)
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dev->flags |= DF_FIXEDCLASS;
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dev->ivars = ivars;
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dev->softc = NULL;
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if (dc)
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dc->devices[unit] = dev;
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dev->state = DS_NOTPRESENT;
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return dev;
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}
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void
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bus_init(bus_t bus, device_t dev, bus_ops_t *ops)
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{
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bus->ops = ops;
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bus->dev = dev;
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TAILQ_INIT(&bus->devices);
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}
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device_t
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bus_add_device(bus_t bus, const char *name, int unit, void *ivars)
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{
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device_t dev;
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dev = make_device(bus, name, unit, ivars);
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TAILQ_INSERT_TAIL(&bus->devices, dev, link);
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return dev;
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}
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device_t
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bus_add_device_after(bus_t bus, device_t place, const char *name,
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int unit, void *ivars)
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{
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device_t dev;
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dev = make_device(bus, name, unit, ivars);
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if (place) {
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TAILQ_INSERT_AFTER(&bus->devices, place, dev, link);
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} else {
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TAILQ_INSERT_HEAD(&bus->devices, dev, link);
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}
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return dev;
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}
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int
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bus_delete_device(bus_t bus, device_t dev)
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{
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int error;
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if (error = device_detach(dev))
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return error;
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if (dev->devclass)
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devclass_delete_device(dev->devclass, dev);
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TAILQ_REMOVE(&bus->devices, dev, link);
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free(dev, M_DEVBUF);
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return 0;
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}
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/*
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* Find only devices attached to this bus.
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*/
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device_t
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bus_find_device(bus_t bus, const char *classname, int unit)
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{
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devclass_t dc;
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device_t dev;
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dc = devclass_find(classname);
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if (!dc)
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return NULL;
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dev = devclass_get_device(dc, unit);
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if (dev && dev->parent == bus)
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return dev;
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return NULL;
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}
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static driver_t *
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first_matching_driver(devclass_t dc, device_t dev)
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{
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if (dev->devclass)
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return devclass_find_driver(dc, dev->devclass->name);
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else
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return TAILQ_FIRST(&dc->drivers);
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}
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static driver_t *
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next_matching_driver(devclass_t dc, device_t dev, driver_t *last)
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{
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if (dev->devclass) {
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driver_t *driver;
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for (driver = TAILQ_NEXT(last, link); driver;
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driver = TAILQ_NEXT(driver, link))
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if (!strcmp(dev->devclass->name, driver->name))
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return driver;
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return NULL;
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} else
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return TAILQ_NEXT(last, link);
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}
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static int
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bus_probe_device(bus_t bus, device_t dev)
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{
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devclass_t dc;
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driver_t *driver;
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void *softc;
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dc = bus->dev->devclass;
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if (dc == NULL)
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panic("bus_probe_device: bus' device has no devclass");
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if (dev->state == DS_ALIVE)
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return 0;
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for (driver = first_matching_driver(dc, dev);
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driver;
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driver = next_matching_driver(dc, dev, driver)) {
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device_set_driver(dev, driver);
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if (driver->probe(bus, dev) == 0) {
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if (!dev->devclass)
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device_set_devclass(dev, driver->name);
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dev->state = DS_ALIVE;
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return 0;
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}
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}
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return ENXIO;
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}
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int
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bus_generic_attach(bus_t parent, device_t busdev)
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{
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bus_t bus = busdev->softc;
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device_t dev;
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int error;
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for (dev = TAILQ_FIRST(&bus->devices);
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dev; dev = TAILQ_NEXT(dev, link))
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device_probe_and_attach(dev);
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return 0;
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}
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int
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bus_generic_detach(bus_t parent, device_t busdev)
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{
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bus_t bus = busdev->softc;
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device_t dev;
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int error;
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if (busdev->state != DS_ATTACHED)
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return EBUSY;
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for (dev = TAILQ_FIRST(&bus->devices);
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dev; dev = TAILQ_NEXT(dev, link))
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device_detach(dev);
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return 0;
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}
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int
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bus_generic_shutdown(bus_t parent, device_t busdev)
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{
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bus_t bus = busdev->softc;
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device_t dev;
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for (dev = TAILQ_FIRST(&bus->devices);
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dev; dev = TAILQ_NEXT(dev, link))
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device_shutdown(dev);
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return 0;
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}
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bus_t
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device_get_parent(device_t dev)
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{
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return dev->parent;
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}
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driver_t *
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device_get_driver(device_t dev)
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{
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return dev->driver;
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}
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devclass_t
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device_get_devclass(device_t dev)
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{
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return dev->devclass;
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}
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const char *
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device_get_name(device_t dev)
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{
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if (dev->devclass)
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return devclass_get_name(dev->devclass);
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return NULL;
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}
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int
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device_get_unit(device_t dev)
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{
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return dev->unit;
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}
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const char *
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device_get_desc(device_t dev)
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{
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return dev->desc;
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}
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void
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device_set_desc(device_t dev, const char* desc)
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{
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dev->desc = desc;
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}
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void *
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device_get_softc(device_t dev)
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{
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return dev->softc;
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}
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void *
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device_get_ivars(device_t dev)
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{
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return dev->ivars;
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}
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device_state_t
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device_get_state(device_t dev)
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{
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return dev->state;
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}
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void
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device_enable(device_t dev)
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{
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dev->flags |= DF_ENABLED;
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}
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void
|
|
device_disable(device_t dev)
|
|
{
|
|
dev->flags &= ~DF_ENABLED;
|
|
}
|
|
|
|
void
|
|
device_busy(device_t dev)
|
|
{
|
|
if (dev->state < DS_ATTACHED)
|
|
panic("device_busy: called for unattached device");
|
|
if (dev->busy == 0 && dev->parent)
|
|
device_busy(dev->parent->dev);
|
|
dev->busy++;
|
|
dev->state = DS_BUSY;
|
|
}
|
|
|
|
void
|
|
device_unbusy(device_t dev)
|
|
{
|
|
if (dev->state != DS_BUSY)
|
|
panic("device_unbusy: called for non-busy device");
|
|
dev->busy--;
|
|
if (dev->busy == 0) {
|
|
if (dev->parent->dev)
|
|
device_unbusy(dev->parent->dev);
|
|
dev->state = DS_ATTACHED;
|
|
}
|
|
}
|
|
|
|
int
|
|
device_is_enabled(device_t dev)
|
|
{
|
|
return (dev->flags & DF_ENABLED) != 0;
|
|
}
|
|
|
|
int
|
|
device_is_alive(device_t dev)
|
|
{
|
|
return dev->state >= DS_ALIVE;
|
|
}
|
|
|
|
int
|
|
device_set_devclass(device_t dev, const char *classname)
|
|
{
|
|
devclass_t dc;
|
|
|
|
if (dev->devclass) {
|
|
printf("device_set_devclass: device class already set\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
dc = devclass_find_internal(classname, TRUE);
|
|
if (!dc)
|
|
return ENOMEM;
|
|
|
|
return devclass_add_device(dc, dev);
|
|
}
|
|
|
|
int
|
|
device_set_driver(device_t dev, driver_t *driver)
|
|
{
|
|
if (dev->state >= DS_ATTACHED)
|
|
return EBUSY;
|
|
|
|
if (dev->driver == driver)
|
|
return 0;
|
|
|
|
if (dev->softc) {
|
|
free(dev->softc, M_DEVBUF);
|
|
dev->softc = NULL;
|
|
}
|
|
dev->driver = driver;
|
|
if (driver) {
|
|
dev->softc = malloc(driver->softc, M_DEVBUF, M_NOWAIT);
|
|
bzero(dev->softc, driver->softc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
device_probe_and_attach(device_t dev)
|
|
{
|
|
bus_t bus = dev->parent;
|
|
int error;
|
|
|
|
if (dev->state >= DS_ALIVE)
|
|
return 0;
|
|
|
|
if (dev->flags & DF_ENABLED) {
|
|
bus_probe_device(bus, dev);
|
|
bus_print_device(bus, dev);
|
|
if (dev->state == DS_ALIVE) {
|
|
error = dev->driver->attach(bus, dev);
|
|
if (!error)
|
|
dev->state = DS_ATTACHED;
|
|
else {
|
|
printf("device_probe_and_attach: %s%n attach returned %d\n",
|
|
dev->driver->name, dev->unit, error);
|
|
device_set_driver(dev, NULL);
|
|
dev->state = DS_NOTPRESENT;
|
|
}
|
|
}
|
|
} else
|
|
printf("%s%d: disabled, not probed.\n",
|
|
dev->devclass->name, dev->unit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
device_detach(device_t dev)
|
|
{
|
|
int error;
|
|
|
|
if (dev->state == DS_BUSY)
|
|
return EBUSY;
|
|
if (dev->state != DS_ATTACHED)
|
|
return 0;
|
|
|
|
if (dev->driver->detach) {
|
|
if (error = dev->driver->detach(dev->parent, dev))
|
|
return error;
|
|
} else
|
|
return EBUSY;
|
|
|
|
if (!(dev->flags & DF_FIXEDCLASS))
|
|
devclass_delete_device(dev->devclass, dev);
|
|
|
|
dev->state = DS_NOTPRESENT;
|
|
device_set_driver(dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
device_shutdown(device_t dev)
|
|
{
|
|
if (dev->state < DS_ATTACHED)
|
|
return 0;
|
|
if (dev->driver->shutdown)
|
|
return dev->driver->shutdown(dev->parent, dev);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
null_print_device(bus_t bus, device_t dev)
|
|
{
|
|
}
|
|
|
|
int
|
|
null_read_ivar(bus_t bus, device_t dev, int index, u_long* result)
|
|
{
|
|
return ENOENT;
|
|
}
|
|
|
|
int
|
|
null_write_ivar(bus_t bus, device_t dev, int index, u_long value)
|
|
{
|
|
return ENOENT;
|
|
}
|
|
|
|
int
|
|
null_map_intr(bus_t bus, device_t dev, driver_intr_t *intr, void *arg)
|
|
{
|
|
/* Propagate up the bus hierarchy until someone handles it. */
|
|
if (bus->dev)
|
|
return bus_map_intr(bus->dev->parent, bus->dev, intr, arg);
|
|
else
|
|
return EINVAL;
|
|
}
|
|
|
|
bus_ops_t null_bus_ops = {
|
|
null_print_device,
|
|
null_read_ivar,
|
|
null_write_ivar,
|
|
null_map_intr,
|
|
};
|
|
|
|
static void
|
|
root_bus_print_device(bus_t bus, device_t dev)
|
|
{
|
|
}
|
|
|
|
static int root_bus_map_intr(bus_t bus, device_t dev,
|
|
driver_intr_t *intr, void *arg)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
static bus_ops_t root_bus_ops = {
|
|
root_bus_print_device,
|
|
null_read_ivar,
|
|
null_write_ivar,
|
|
root_bus_map_intr,
|
|
};
|
|
|
|
static struct bus the_root_bus;
|
|
bus_t root_bus = &the_root_bus;
|
|
device_t root_device;
|
|
devclass_t root_devclass;
|
|
|
|
static int
|
|
root_bus_module_handler(module_t mod, modeventtype_t what, void* arg)
|
|
{
|
|
switch (what) {
|
|
case MOD_LOAD:
|
|
devclass_init();
|
|
root_device = make_device(NULL, "root", 0, NULL);
|
|
root_device->state = DS_ATTACHED;
|
|
bus_init(root_bus, root_device, &root_bus_ops);
|
|
root_devclass = devclass_find("root");
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t root_bus_mod = {
|
|
"rootbus",
|
|
root_bus_module_handler,
|
|
0
|
|
};
|
|
DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
|
|
|
|
void
|
|
root_bus_configure()
|
|
{
|
|
device_t dev;
|
|
int error;
|
|
|
|
for (dev = TAILQ_FIRST(&root_bus->devices); dev;
|
|
dev = TAILQ_NEXT(dev, link)) {
|
|
device_probe_and_attach(dev);
|
|
}
|
|
}
|
|
|
|
int
|
|
driver_module_handler(module_t mod, modeventtype_t what, void* arg)
|
|
{
|
|
struct driver_module_data* data = (struct driver_module_data*) arg;
|
|
devclass_t bus_devclass = devclass_find_internal(data->busname, TRUE);
|
|
int error;
|
|
|
|
switch (what) {
|
|
case MOD_LOAD:
|
|
if (error = devclass_add_driver(bus_devclass,
|
|
data->driver))
|
|
return error;
|
|
*data->devclass =
|
|
devclass_find_internal(data->driver->name, TRUE);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
if (error = devclass_delete_driver(bus_devclass,
|
|
data->driver))
|
|
return error;
|
|
break;
|
|
}
|
|
|
|
if (data->chainevh)
|
|
return data->chainevh(mod, what, data->chainarg);
|
|
else
|
|
return 0;
|
|
}
|