2 * Copyright (C) 2018 Breno Leitao
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 #include <sys/cdefs.h>
26 __FBSDID("$FreeBSD$");
28 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
31 #include <sys/module.h>
32 #include <sys/types.h>
38 #include <machine/bus.h>
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
47 extern u_char *mfs_root;
48 extern uint32_t mfs_root_size;
50 #warning "MD_ROOT_MEM should be set to use ofw initrd as a md device"
53 /* bus entry points */
54 static int ofw_initrd_probe(device_t dev);
55 static int ofw_initrd_attach(device_t dev);
56 static void ofw_initrd_identify(driver_t *driver, device_t parent);
58 struct ofw_initrd_softc {
65 ofw_initrd_probe(device_t dev)
69 /* limit this device to one unit */
70 if (device_get_unit(dev) != 0)
73 chosen = OF_finddevice("/chosen");
78 if (!OF_hasprop(chosen, "linux,initrd-start") ||
79 !OF_hasprop(chosen, "linux,initrd-end"))
82 device_set_desc(dev, "OFW initrd memregion loader");
83 return (BUS_PROBE_DEFAULT);
87 ofw_initrd_attach(device_t dev)
89 struct ofw_initrd_softc *sc;
90 vm_paddr_t start, end;
95 sc = device_get_softc(dev);
97 chosen = OF_finddevice("/chosen");
99 device_printf(dev, "/chosen not found\n");
103 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
107 start = (uint64_t)cell[0] << 32 | cell[1];
109 device_printf(dev, "Wrong linux,initrd-start size\n");
113 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
117 end = (uint64_t)cell[0] << 32 | cell[1];
119 device_printf(dev, "Wrong linux,initrd-end size\n");
123 if (end - start > 0) {
124 mfs_root = (u_char *) PHYS_TO_DMAP(start);
125 mfs_root_size = end - start;
134 ofw_initrd_identify(driver_t *driver, device_t parent)
136 if (device_find_child(parent, "initrd", -1) != NULL)
139 if (BUS_ADD_CHILD(parent, 10, "initrd", -1) == NULL)
140 device_printf(parent, "add ofw_initrd child failed\n");
143 static device_method_t ofw_initrd_methods[] = {
144 DEVMETHOD(device_identify, ofw_initrd_identify),
145 DEVMETHOD(device_probe, ofw_initrd_probe),
146 DEVMETHOD(device_attach, ofw_initrd_attach),
150 static driver_t ofw_initrd_driver = {
153 sizeof(struct ofw_initrd_softc)
156 static devclass_t ofw_initrd_devclass;
158 DRIVER_MODULE(ofw_initrd, ofwbus, ofw_initrd_driver, ofw_initrd_devclass,