2 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/socket.h>
35 #include <sys/module.h>
38 #include <machine/bus.h>
39 #include <machine/resource.h>
43 #include <vm/vm_param.h>
45 #include <machine/md_var.h>
46 #include <machine/pc/bios.h>
49 * System Management BIOS Reference Specification, v2.4 Final
50 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
54 * SMBIOS Entry Point Structure
57 u_int8_t Anchor[4]; /* '_SM_' */
61 u_int8_t SMBIOS_Major;
62 u_int8_t SMBIOS_Minor;
65 u_int8_t Formatted_Area[5];
67 u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */
68 u_int8_t Intermediate_Checksum;
70 u_int16_t Structure_Table_Length;
71 u_int32_t Structure_Table_Address;
72 u_int16_t Structure_Count;
74 u_int8_t SMBIOS_BCD_Revision;
79 struct resource * res;
82 struct smbios_eps * eps;
85 #define SMBIOS_START 0xf0000
86 #define SMBIOS_STEP 0x10
89 #define SMBIOS_SIG "_SM_"
91 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res))
92 #define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
94 static devclass_t smbios_devclass;
96 static void smbios_identify (driver_t *, device_t);
97 static int smbios_probe (device_t);
98 static int smbios_attach (device_t);
99 static int smbios_detach (device_t);
100 static int smbios_modevent (module_t, int, void *);
102 static int smbios_cksum (struct smbios_eps *);
105 smbios_identify (driver_t *driver, device_t parent)
112 if (!device_is_alive(parent))
115 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
116 SMBIOS_STEP, SMBIOS_OFF);
119 length = ADDR2EPS(addr)->Length;
121 if (length != 0x1f) {
122 u_int8_t major, minor;
124 major = ADDR2EPS(addr)->SMBIOS_Major;
125 minor = ADDR2EPS(addr)->SMBIOS_Minor;
127 /* SMBIOS v2.1 implementation might use 0x1e. */
128 if (length == 0x1e && major == 2 && minor == 1)
134 child = BUS_ADD_CHILD(parent, 0, "smbios", -1);
135 device_set_driver(child, driver);
136 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
137 device_set_desc(child, "System Management BIOS");
144 smbios_probe (device_t dev)
146 struct resource *res;
152 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
154 device_printf(dev, "Unable to allocate memory resource.\n");
159 if (smbios_cksum(RES2EPS(res))) {
160 device_printf(dev, "SMBIOS checksum failed.\n");
167 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
172 smbios_attach (device_t dev)
174 struct smbios_softc *sc;
177 sc = device_get_softc(dev);
182 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
184 if (sc->res == NULL) {
185 device_printf(dev, "Unable to allocate memory resource.\n");
189 sc->eps = RES2EPS(sc->res);
191 device_printf(dev, "Version: %u.%u",
192 sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
193 if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
194 printf(", BCD Revision: %u.%u",
195 bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
196 bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
202 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
207 smbios_detach (device_t dev)
209 struct smbios_softc *sc;
211 sc = device_get_softc(dev);
214 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
220 smbios_modevent (mod, what, arg)
233 devclass_get_devices(smbios_devclass, &devs, &count);
234 for (i = 0; i < count; i++) {
235 device_delete_child(device_get_parent(devs[i]), devs[i]);
245 static device_method_t smbios_methods[] = {
246 /* Device interface */
247 DEVMETHOD(device_identify, smbios_identify),
248 DEVMETHOD(device_probe, smbios_probe),
249 DEVMETHOD(device_attach, smbios_attach),
250 DEVMETHOD(device_detach, smbios_detach),
254 static driver_t smbios_driver = {
257 sizeof(struct smbios_softc),
260 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
261 MODULE_VERSION(smbios, 1);
264 smbios_cksum (struct smbios_eps *e)
272 for (i = 0; i < e->Length; i++) {