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 #include <sys/malloc.h>
34
35 #include <sys/module.h>
36 #include <sys/bus.h>
37 #include <sys/conf.h>
38
39 #include <machine/bus.h>
40 #include <machine/resource.h>
41 #include <sys/rman.h>
42
43 /* And all this for BIOS_PADDRTOVADDR() */
44 #include <vm/vm.h>
45 #include <vm/vm_param.h>
46 #include <vm/pmap.h>
47 #include <machine/md_var.h>
48 #include <machine/pc/bios.h>
49
50 #include <machine/smapi.h>
51
52 #define SMAPI_START 0xf0000
53 #define SMAPI_STEP 0x10
54 #define SMAPI_OFF 0
55 #define SMAPI_LEN 4
56 #define SMAPI_SIG "$SMB"
57
58 #define RES2HDR(res) ((struct smapi_bios_header *)rman_get_virtual(res))
59 #define ADDR2HDR(addr) ((struct smapi_bios_header *)BIOS_PADDRTOVADDR(addr))
60
61 struct smapi_softc {
62 struct cdev * cdev;
63 device_t dev;
64 struct resource * res;
65 int rid;
66
67 u_int32_t smapi32_entry;
68
69 struct smapi_bios_header *header;
70 };
71
72 extern u_long smapi32_offset;
73 extern u_short smapi32_segment;
74
75 devclass_t smapi_devclass;
76
77 static d_ioctl_t smapi_ioctl;
78
79 static struct cdevsw smapi_cdevsw = {
80 .d_version = D_VERSION,
81 .d_ioctl = smapi_ioctl,
82 .d_name = "smapi",
83 .d_flags = D_NEEDGIANT,
84 };
85
86 static void smapi_identify(driver_t *, device_t);
87 static int smapi_probe(device_t);
88 static int smapi_attach(device_t);
89 static int smapi_detach(device_t);
90 static int smapi_modevent(module_t, int, void *);
91
92 static int smapi_header_cksum(struct smapi_bios_header *);
93
94 extern int smapi32(struct smapi_bios_parameter *,
95 struct smapi_bios_parameter *);
96 extern int smapi32_new(u_long, u_short,
97 struct smapi_bios_parameter *,
98 struct smapi_bios_parameter *);
99
100 static int
101 smapi_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
102 {
103 struct smapi_softc *sc;
104 int error;
105
106 error = 0;
107 sc = devclass_get_softc(smapi_devclass, dev2unit(dev));
108 if (sc == NULL) {
109 error = ENXIO;
110 goto fail;
111 }
112
113 switch (cmd) {
114 case SMAPIOGHEADER:
115 bcopy((caddr_t)sc->header, data,
116 sizeof(struct smapi_bios_header));
117 error = 0;
118 break;
119 case SMAPIOCGFUNCTION:
120 smapi32_offset = sc->smapi32_entry;
121 error = smapi32((struct smapi_bios_parameter *)data,
122 (struct smapi_bios_parameter *)data);
123 break;
124 default:
125 error = ENOTTY;
126 }
127
128 fail:
129 return (error);
130 }
131
132 static int
133 smapi_header_cksum (struct smapi_bios_header *header)
134 {
135 u_int8_t *ptr;
136 u_int8_t cksum;
137 int i;
138
139 ptr = (u_int8_t *)header;
140 cksum = 0;
141 for (i = 0; i < header->length; i++) {
142 cksum += ptr[i];
143 }
144
145 return (cksum);
146 }
147
148 static void
149 smapi_identify (driver_t *driver, device_t parent)
150 {
151 device_t child;
152 u_int32_t addr;
153 int length;
154 int rid;
155
156 if (!device_is_alive(parent))
157 return;
158
159 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN,
160 SMAPI_STEP, SMAPI_OFF);
161 if (addr != 0) {
162 rid = 0;
163 length = ADDR2HDR(addr)->length;
164
165 child = BUS_ADD_CHILD(parent, 5, "smapi", -1);
166 device_set_driver(child, driver);
167 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
168 device_set_desc(child, "SMAPI BIOS");
169 }
170
171 return;
172 }
173
174 static int
175 smapi_probe (device_t dev)
176 {
177 struct resource *res;
178 int rid;
179 int error;
180
181 error = 0;
182 rid = 0;
183 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
184 if (res == NULL) {
185 device_printf(dev, "Unable to allocate memory resource.\n");
186 error = ENOMEM;
187 goto bad;
188 }
189
190 if (smapi_header_cksum(RES2HDR(res))) {
191 device_printf(dev, "SMAPI header checksum failed.\n");
192 error = ENXIO;
193 goto bad;
194 }
195
196 bad:
197 if (res)
198 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
199 return (error);
200 }
201
202 static int
203 smapi_attach (device_t dev)
204 {
205 struct smapi_softc *sc;
206 int error;
207
208 sc = device_get_softc(dev);
209 error = 0;
210
211 sc->dev = dev;
212 sc->rid = 0;
213 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
214 RF_ACTIVE);
215 if (sc->res == NULL) {
216 device_printf(dev, "Unable to allocate memory resource.\n");
217 error = ENOMEM;
218 goto bad;
219 }
220 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
221 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
222 sc->header->prot32_segment +
223 sc->header->prot32_offset);
224
225 sc->cdev = make_dev(&smapi_cdevsw,
226 device_get_unit(sc->dev),
227 UID_ROOT, GID_WHEEL, 0600,
228 "%s%d",
229 smapi_cdevsw.d_name,
230 device_get_unit(sc->dev));
231
232 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n",
233 bcd2bin(sc->header->version_major),
234 bcd2bin(sc->header->version_minor),
235 sc->header->length,
236 sc->header->checksum);
237 device_printf(dev, "Information=0x%b\n",
238 sc->header->information,
239 "\020"
240 "\001REAL_VM86"
241 "\002PROTECTED_16"
242 "\003PROTECTED_32");
243
244 if (bootverbose) {
245 if (sc->header->information & SMAPI_REAL_VM86)
246 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
247 sc->header->real16_segment,
248 sc->header->real16_offset);
249 if (sc->header->information & SMAPI_PROT_16BIT)
250 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
251 sc->header->prot16_segment,
252 sc->header->prot16_offset);
253 if (sc->header->information & SMAPI_PROT_32BIT)
254 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
255 sc->header->prot32_segment,
256 sc->header->prot32_offset);
257 }
258
259 return (0);
260 bad:
261 if (sc->res)
262 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
263 return (error);
264 }
265
266 static int
267 smapi_detach (device_t dev)
268 {
269 struct smapi_softc *sc;
270
271 sc = device_get_softc(dev);
272
273 destroy_dev(sc->cdev);
274
275 if (sc->res)
276 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
277
278 return (0);
279 }
280
281 static int
282 smapi_modevent (module_t mod, int what, void *arg)
283 {
284 device_t * devs;
285 int count;
286 int i;
287
288 switch (what) {
289 case MOD_LOAD:
290 break;
291 case MOD_UNLOAD:
292 devclass_get_devices(smapi_devclass, &devs, &count);
293 for (i = 0; i < count; i++) {
294 device_delete_child(device_get_parent(devs[i]), devs[i]);
295 }
296 free(devs, M_TEMP);
297 break;
298 default:
299 break;
300 }
301
302 return (0);
303 }
304
305 static device_method_t smapi_methods[] = {
306 /* Device interface */
307 DEVMETHOD(device_identify, smapi_identify),
308 DEVMETHOD(device_probe, smapi_probe),
309 DEVMETHOD(device_attach, smapi_attach),
310 DEVMETHOD(device_detach, smapi_detach),
311 { 0, 0 }
312 };
313
314 static driver_t smapi_driver = {
315 "smapi",
316 smapi_methods,
317 sizeof(struct smapi_softc),
318 };
319
320 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0);
321 MODULE_VERSION(smapi, 1);
Cache object: 612c26381c739533b9ced79011abd807
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