FreeBSD/Linux Kernel Cross Reference
sys/i386/bios/smbios.c
1 /*-
2 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/8.0/sys/i386/bios/smbios.c 196405 2009-08-20 20:23:28Z jhb $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/socket.h>
34
35 #include <sys/module.h>
36 #include <sys/bus.h>
37
38 #include <machine/bus.h>
39 #include <machine/resource.h>
40 #include <sys/rman.h>
41
42 #include <vm/vm.h>
43 #include <vm/vm_param.h>
44 #include <vm/pmap.h>
45 #include <machine/md_var.h>
46 #include <machine/pc/bios.h>
47
48 /*
49 * System Management BIOS Reference Specification, v2.4 Final
50 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
51 */
52
53 /*
54 * SMBIOS Entry Point Structure
55 */
56 struct smbios_eps {
57 u_int8_t Anchor[4]; /* '_SM_' */
58 u_int8_t Checksum;
59 u_int8_t Length;
60
61 u_int8_t SMBIOS_Major;
62 u_int8_t SMBIOS_Minor;
63 u_int16_t Max_Size;
64 u_int8_t Revision;
65 u_int8_t Formatted_Area[5];
66
67 u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */
68 u_int8_t Intermediate_Checksum;
69
70 u_int16_t Structure_Table_Length;
71 u_int32_t Structure_Table_Address;
72 u_int16_t Structure_Count;
73
74 u_int8_t SMBIOS_BCD_Revision;
75 } __packed;
76
77 struct smbios_softc {
78 device_t dev;
79 struct resource * res;
80 int rid;
81
82 struct smbios_eps * eps;
83 };
84
85 #define SMBIOS_START 0xf0000
86 #define SMBIOS_STEP 0x10
87 #define SMBIOS_OFF 0
88 #define SMBIOS_LEN 4
89 #define SMBIOS_SIG "_SM_"
90
91 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res))
92 #define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
93
94 static devclass_t smbios_devclass;
95
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 *);
101
102 static int smbios_cksum (struct smbios_eps *);
103
104 static void
105 smbios_identify (driver_t *driver, device_t parent)
106 {
107 device_t child;
108 u_int32_t addr;
109 int length;
110 int rid;
111
112 if (!device_is_alive(parent))
113 return;
114
115 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
116 SMBIOS_STEP, SMBIOS_OFF);
117 if (addr != 0) {
118 rid = 0;
119 length = ADDR2EPS(addr)->Length;
120
121 if (length != 0x1f) {
122 u_int8_t major, minor;
123
124 major = ADDR2EPS(addr)->SMBIOS_Major;
125 minor = ADDR2EPS(addr)->SMBIOS_Minor;
126
127 /* SMBIOS v2.1 implementation might use 0x1e. */
128 if (length == 0x1e && major == 2 && minor == 1)
129 length = 0x1f;
130 else
131 return;
132 }
133
134 child = BUS_ADD_CHILD(parent, 5, "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");
138 }
139
140 return;
141 }
142
143 static int
144 smbios_probe (device_t dev)
145 {
146 struct resource *res;
147 int rid;
148 int error;
149
150 error = 0;
151 rid = 0;
152 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
153 if (res == NULL) {
154 device_printf(dev, "Unable to allocate memory resource.\n");
155 error = ENOMEM;
156 goto bad;
157 }
158
159 if (smbios_cksum(RES2EPS(res))) {
160 device_printf(dev, "SMBIOS checksum failed.\n");
161 error = ENXIO;
162 goto bad;
163 }
164
165 bad:
166 if (res)
167 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
168 return (error);
169 }
170
171 static int
172 smbios_attach (device_t dev)
173 {
174 struct smbios_softc *sc;
175 int error;
176
177 sc = device_get_softc(dev);
178 error = 0;
179
180 sc->dev = dev;
181 sc->rid = 0;
182 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
183 RF_ACTIVE);
184 if (sc->res == NULL) {
185 device_printf(dev, "Unable to allocate memory resource.\n");
186 error = ENOMEM;
187 goto bad;
188 }
189 sc->eps = RES2EPS(sc->res);
190
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));
197 printf("\n");
198
199 return (0);
200 bad:
201 if (sc->res)
202 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
203 return (error);
204 }
205
206 static int
207 smbios_detach (device_t dev)
208 {
209 struct smbios_softc *sc;
210
211 sc = device_get_softc(dev);
212
213 if (sc->res)
214 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
215
216 return (0);
217 }
218
219 static int
220 smbios_modevent (mod, what, arg)
221 module_t mod;
222 int what;
223 void * arg;
224 {
225 device_t * devs;
226 int count;
227 int i;
228
229 switch (what) {
230 case MOD_LOAD:
231 break;
232 case MOD_UNLOAD:
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]);
236 }
237 break;
238 default:
239 break;
240 }
241
242 return (0);
243 }
244
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),
251 { 0, 0 }
252 };
253
254 static driver_t smbios_driver = {
255 "smbios",
256 smbios_methods,
257 sizeof(struct smbios_softc),
258 };
259
260 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
261 MODULE_VERSION(smbios, 1);
262
263 static int
264 smbios_cksum (struct smbios_eps *e)
265 {
266 u_int8_t *ptr;
267 u_int8_t cksum;
268 int i;
269
270 ptr = (u_int8_t *)e;
271 cksum = 0;
272 for (i = 0; i < e->Length; i++) {
273 cksum += ptr[i];
274 }
275
276 return (cksum);
277 }
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