FreeBSD/Linux Kernel Cross Reference
sys/i386/bios/smapi.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("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33
34 #include <sys/module.h>
35 #include <sys/bus.h>
36 #include <sys/conf.h>
37
38 #include <machine/bus.h>
39 #include <machine/resource.h>
40 #include <sys/rman.h>
41
42 /* And all this for BIOS_PADDRTOVADDR() */
43 #include <vm/vm.h>
44 #include <vm/vm_param.h>
45 #include <vm/pmap.h>
46 #include <machine/md_var.h>
47 #include <machine/pc/bios.h>
48
49 #include <machine/smapi.h>
50
51 #define SMAPI_START 0xf0000
52 #define SMAPI_STEP 0x10
53 #define SMAPI_OFF 0
54 #define SMAPI_LEN 4
55 #define SMAPI_SIG "$SMB"
56
57 #define RES2HDR(res) ((struct smapi_bios_header *)rman_get_virtual(res))
58 #define ADDR2HDR(addr) ((struct smapi_bios_header *)BIOS_PADDRTOVADDR(addr))
59
60 struct smapi_softc {
61 struct cdev *cdev;
62 device_t dev;
63 struct resource * res;
64 int rid;
65
66 u_int32_t smapi32_entry;
67
68 struct smapi_bios_header *header;
69 };
70
71 extern u_long smapi32_offset;
72 extern u_short smapi32_segment;
73
74 devclass_t smapi_devclass;
75
76 static d_ioctl_t smapi_ioctl;
77
78 static struct cdevsw smapi_cdevsw = {
79 .d_version = D_VERSION,
80 .d_ioctl = smapi_ioctl,
81 .d_name = "smapi",
82 .d_flags = D_MEM | D_NEEDGIANT,
83 };
84
85 static void smapi_identify (driver_t *, device_t);
86 static int smapi_probe (device_t);
87 static int smapi_attach (device_t);
88 static int smapi_detach (device_t);
89 static int smapi_modevent (module_t, int, void *);
90
91 static int smapi_header_cksum (struct smapi_bios_header *);
92
93 extern int smapi32 (struct smapi_bios_parameter *,
94 struct smapi_bios_parameter *);
95 extern int smapi32_new (u_long, u_short,
96 struct smapi_bios_parameter *,
97 struct smapi_bios_parameter *);
98
99 static int
100 smapi_ioctl (dev, cmd, data, fflag, td)
101 struct cdev *dev;
102 u_long cmd;
103 caddr_t data;
104 int fflag;
105 d_thread_t * td;
106 {
107 struct smapi_softc *sc;
108 int error;
109
110 error = 0;
111 sc = devclass_get_softc(smapi_devclass, minor(dev));
112 if (sc == NULL) {
113 error = ENXIO;
114 goto fail;
115 }
116
117 switch (cmd) {
118 case SMAPIOGHEADER:
119 bcopy((caddr_t)sc->header, data,
120 sizeof(struct smapi_bios_header));
121 error = 0;
122 break;
123 case SMAPIOCGFUNCTION:
124 smapi32_offset = sc->smapi32_entry;
125 error = smapi32((struct smapi_bios_parameter *)data,
126 (struct smapi_bios_parameter *)data);
127 break;
128 default:
129 error = ENOTTY;
130 }
131
132 fail:
133 return (error);
134 }
135
136 static int
137 smapi_header_cksum (struct smapi_bios_header *header)
138 {
139 u_int8_t *ptr;
140 u_int8_t cksum;
141 int i;
142
143 ptr = (u_int8_t *)header;
144 cksum = 0;
145 for (i = 0; i < header->length; i++) {
146 cksum += ptr[i];
147 }
148
149 return (cksum);
150 }
151
152 static void
153 smapi_identify (driver_t *driver, device_t parent)
154 {
155 device_t child;
156 u_int32_t addr;
157 int length;
158 int rid;
159
160 if (!device_is_alive(parent))
161 return;
162
163 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN,
164 SMAPI_STEP, SMAPI_OFF);
165 if (addr != 0) {
166 rid = 0;
167 length = ADDR2HDR(addr)->length;
168
169 child = BUS_ADD_CHILD(parent, 5, "smapi", -1);
170 device_set_driver(child, driver);
171 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
172 device_set_desc(child, "SMAPI BIOS");
173 }
174
175 return;
176 }
177
178 static int
179 smapi_probe (device_t dev)
180 {
181 struct resource *res;
182 int rid;
183 int error;
184
185 error = 0;
186 rid = 0;
187 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
188 if (res == NULL) {
189 device_printf(dev, "Unable to allocate memory resource.\n");
190 error = ENOMEM;
191 goto bad;
192 }
193
194 if (smapi_header_cksum(RES2HDR(res))) {
195 device_printf(dev, "SMAPI header checksum failed.\n");
196 error = ENXIO;
197 goto bad;
198 }
199
200 bad:
201 if (res)
202 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
203 return (error);
204 }
205
206 static int
207 smapi_attach (device_t dev)
208 {
209 struct smapi_softc *sc;
210 int error;
211
212 sc = device_get_softc(dev);
213 error = 0;
214
215 sc->dev = dev;
216 sc->rid = 0;
217 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
218 RF_ACTIVE);
219 if (sc->res == NULL) {
220 device_printf(dev, "Unable to allocate memory resource.\n");
221 error = ENOMEM;
222 goto bad;
223 }
224 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
225 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
226 sc->header->prot32_segment +
227 sc->header->prot32_offset);
228
229 sc->cdev = make_dev(&smapi_cdevsw,
230 device_get_unit(sc->dev),
231 UID_ROOT, GID_WHEEL, 0600,
232 "%s%d",
233 smapi_cdevsw.d_name,
234 device_get_unit(sc->dev));
235
236 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n",
237 bcd2bin(sc->header->version_major),
238 bcd2bin(sc->header->version_minor),
239 sc->header->length,
240 sc->header->checksum);
241 device_printf(dev, "Information=0x%b\n",
242 sc->header->information,
243 "\020"
244 "\001REAL_VM86"
245 "\002PROTECTED_16"
246 "\003PROTECTED_32");
247
248 if (bootverbose) {
249 if (sc->header->information & SMAPI_REAL_VM86)
250 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
251 sc->header->real16_segment,
252 sc->header->real16_offset);
253 if (sc->header->information & SMAPI_PROT_16BIT)
254 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
255 sc->header->prot16_segment,
256 sc->header->prot16_offset);
257 if (sc->header->information & SMAPI_PROT_32BIT)
258 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
259 sc->header->prot32_segment,
260 sc->header->prot32_offset);
261 }
262
263 return (0);
264 bad:
265 if (sc->res)
266 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
267 return (error);
268 }
269
270 static int
271 smapi_detach (device_t dev)
272 {
273 struct smapi_softc *sc;
274
275 sc = device_get_softc(dev);
276
277 destroy_dev(sc->cdev);
278
279 if (sc->res)
280 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
281
282 return (0);
283 }
284
285 static int
286 smapi_modevent (mod, what, arg)
287 module_t mod;
288 int what;
289 void * arg;
290 {
291 device_t * devs;
292 int count;
293 int i;
294
295 switch (what) {
296 case MOD_LOAD:
297 break;
298 case MOD_UNLOAD:
299 devclass_get_devices(smapi_devclass, &devs, &count);
300 for (i = 0; i < count; i++) {
301 device_delete_child(device_get_parent(devs[i]), devs[i]);
302 }
303 break;
304 default:
305 break;
306 }
307
308 return (0);
309 }
310
311 static device_method_t smapi_methods[] = {
312 /* Device interface */
313 DEVMETHOD(device_identify, smapi_identify),
314 DEVMETHOD(device_probe, smapi_probe),
315 DEVMETHOD(device_attach, smapi_attach),
316 DEVMETHOD(device_detach, smapi_detach),
317 { 0, 0 }
318 };
319
320 static driver_t smapi_driver = {
321 "smapi",
322 smapi_methods,
323 sizeof(struct smapi_softc),
324 };
325
326 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0);
327 MODULE_VERSION(smapi, 1);
Cache object: cf21f370787e42ca0964b2d98cd564c5
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