2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/socket.h>
38 #include <sys/module.h>
41 #include <machine/bus.h>
42 #include <machine/resource.h>
46 #include <vm/vm_param.h>
48 #include <machine/md_var.h>
49 #include <machine/pc/bios.h>
52 * System Management BIOS Reference Specification, v2.4 Final
53 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
58 struct resource * res;
61 struct smbios_eps * eps;
64 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res))
65 #define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
67 static devclass_t smbios_devclass;
69 static void smbios_identify (driver_t *, device_t);
70 static int smbios_probe (device_t);
71 static int smbios_attach (device_t);
72 static int smbios_detach (device_t);
73 static int smbios_modevent (module_t, int, void *);
75 static int smbios_cksum (struct smbios_eps *);
78 smbios_identify (driver_t *driver, device_t parent)
85 if (!device_is_alive(parent))
88 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
89 SMBIOS_STEP, SMBIOS_OFF);
92 length = ADDR2EPS(addr)->length;
95 u_int8_t major, minor;
97 major = ADDR2EPS(addr)->major_version;
98 minor = ADDR2EPS(addr)->minor_version;
100 /* SMBIOS v2.1 implementation might use 0x1e. */
101 if (length == 0x1e && major == 2 && minor == 1)
107 child = BUS_ADD_CHILD(parent, 5, "smbios", -1);
108 device_set_driver(child, driver);
109 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
110 device_set_desc(child, "System Management BIOS");
117 smbios_probe (device_t dev)
119 struct resource *res;
125 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
127 device_printf(dev, "Unable to allocate memory resource.\n");
132 if (smbios_cksum(RES2EPS(res))) {
133 device_printf(dev, "SMBIOS checksum failed.\n");
140 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
145 smbios_attach (device_t dev)
147 struct smbios_softc *sc;
150 sc = device_get_softc(dev);
155 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
157 if (sc->res == NULL) {
158 device_printf(dev, "Unable to allocate memory resource.\n");
162 sc->eps = RES2EPS(sc->res);
164 device_printf(dev, "Version: %u.%u",
165 sc->eps->major_version, sc->eps->minor_version);
166 if (bcd2bin(sc->eps->BCD_revision))
167 printf(", BCD Revision: %u.%u",
168 bcd2bin(sc->eps->BCD_revision >> 4),
169 bcd2bin(sc->eps->BCD_revision & 0x0f));
175 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
180 smbios_detach (device_t dev)
182 struct smbios_softc *sc;
184 sc = device_get_softc(dev);
187 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
193 smbios_modevent (mod, what, arg)
206 devclass_get_devices(smbios_devclass, &devs, &count);
207 for (i = 0; i < count; i++) {
208 device_delete_child(device_get_parent(devs[i]), devs[i]);
219 static device_method_t smbios_methods[] = {
220 /* Device interface */
221 DEVMETHOD(device_identify, smbios_identify),
222 DEVMETHOD(device_probe, smbios_probe),
223 DEVMETHOD(device_attach, smbios_attach),
224 DEVMETHOD(device_detach, smbios_detach),
228 static driver_t smbios_driver = {
231 sizeof(struct smbios_softc),
234 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
235 MODULE_VERSION(smbios, 1);
238 smbios_cksum (struct smbios_eps *e)
246 for (i = 0; i < e->length; i++) {