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 (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
101 {
102 struct smapi_softc *sc;
103 int error;
104
105 error = 0;
106 sc = devclass_get_softc(smapi_devclass, dev2unit(dev));
107 if (sc == NULL) {
108 error = ENXIO;
109 goto fail;
110 }
111
112 switch (cmd) {
113 case SMAPIOGHEADER:
114 bcopy((caddr_t)sc->header, data,
115 sizeof(struct smapi_bios_header));
116 error = 0;
117 break;
118 case SMAPIOCGFUNCTION:
119 smapi32_offset = sc->smapi32_entry;
120 error = smapi32((struct smapi_bios_parameter *)data,
121 (struct smapi_bios_parameter *)data);
122 break;
123 default:
124 error = ENOTTY;
125 }
126
127 fail:
128 return (error);
129 }
130
131 static int
132 smapi_header_cksum (struct smapi_bios_header *header)
133 {
134 u_int8_t *ptr;
135 u_int8_t cksum;
136 int i;
137
138 ptr = (u_int8_t *)header;
139 cksum = 0;
140 for (i = 0; i < header->length; i++) {
141 cksum += ptr[i];
142 }
143
144 return (cksum);
145 }
146
147 static void
148 smapi_identify (driver_t *driver, device_t parent)
149 {
150 device_t child;
151 u_int32_t addr;
152 int length;
153 int rid;
154
155 if (!device_is_alive(parent))
156 return;
157
158 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN,
159 SMAPI_STEP, SMAPI_OFF);
160 if (addr != 0) {
161 rid = 0;
162 length = ADDR2HDR(addr)->length;
163
164 child = BUS_ADD_CHILD(parent, 5, "smapi", -1);
165 device_set_driver(child, driver);
166 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
167 device_set_desc(child, "SMAPI BIOS");
168 }
169
170 return;
171 }
172
173 static int
174 smapi_probe (device_t dev)
175 {
176 struct resource *res;
177 int rid;
178 int error;
179
180 error = 0;
181 rid = 0;
182 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
183 if (res == NULL) {
184 device_printf(dev, "Unable to allocate memory resource.\n");
185 error = ENOMEM;
186 goto bad;
187 }
188
189 if (smapi_header_cksum(RES2HDR(res))) {
190 device_printf(dev, "SMAPI header checksum failed.\n");
191 error = ENXIO;
192 goto bad;
193 }
194
195 bad:
196 if (res)
197 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
198 return (error);
199 }
200
201 static int
202 smapi_attach (device_t dev)
203 {
204 struct smapi_softc *sc;
205 int error;
206
207 sc = device_get_softc(dev);
208 error = 0;
209
210 sc->dev = dev;
211 sc->rid = 0;
212 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
213 RF_ACTIVE);
214 if (sc->res == NULL) {
215 device_printf(dev, "Unable to allocate memory resource.\n");
216 error = ENOMEM;
217 goto bad;
218 }
219 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
220 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
221 sc->header->prot32_segment +
222 sc->header->prot32_offset);
223
224 sc->cdev = make_dev(&smapi_cdevsw,
225 device_get_unit(sc->dev),
226 UID_ROOT, GID_WHEEL, 0600,
227 "%s%d",
228 smapi_cdevsw.d_name,
229 device_get_unit(sc->dev));
230
231 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n",
232 bcd2bin(sc->header->version_major),
233 bcd2bin(sc->header->version_minor),
234 sc->header->length,
235 sc->header->checksum);
236 device_printf(dev, "Information=0x%b\n",
237 sc->header->information,
238 "\020"
239 "\001REAL_VM86"
240 "\002PROTECTED_16"
241 "\003PROTECTED_32");
242
243 if (bootverbose) {
244 if (sc->header->information & SMAPI_REAL_VM86)
245 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
246 sc->header->real16_segment,
247 sc->header->real16_offset);
248 if (sc->header->information & SMAPI_PROT_16BIT)
249 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
250 sc->header->prot16_segment,
251 sc->header->prot16_offset);
252 if (sc->header->information & SMAPI_PROT_32BIT)
253 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
254 sc->header->prot32_segment,
255 sc->header->prot32_offset);
256 }
257
258 return (0);
259 bad:
260 if (sc->res)
261 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
262 return (error);
263 }
264
265 static int
266 smapi_detach (device_t dev)
267 {
268 struct smapi_softc *sc;
269
270 sc = device_get_softc(dev);
271
272 destroy_dev(sc->cdev);
273
274 if (sc->res)
275 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
276
277 return (0);
278 }
279
280 static int
281 smapi_modevent (module_t mod, int what, void *arg)
282 {
283 device_t * devs;
284 int count;
285 int i;
286
287 switch (what) {
288 case MOD_LOAD:
289 break;
290 case MOD_UNLOAD:
291 devclass_get_devices(smapi_devclass, &devs, &count);
292 for (i = 0; i < count; i++) {
293 device_delete_child(device_get_parent(devs[i]), devs[i]);
294 }
295 break;
296 default:
297 break;
298 }
299
300 return (0);
301 }
302
303 static device_method_t smapi_methods[] = {
304 /* Device interface */
305 DEVMETHOD(device_identify, smapi_identify),
306 DEVMETHOD(device_probe, smapi_probe),
307 DEVMETHOD(device_attach, smapi_attach),
308 DEVMETHOD(device_detach, smapi_detach),
309 { 0, 0 }
310 };
311
312 static driver_t smapi_driver = {
313 "smapi",
314 smapi_methods,
315 sizeof(struct smapi_softc),
316 };
317
318 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0);
319 MODULE_VERSION(smapi, 1);
Cache object: 2cae58fb4f06b52bbc124a1fe62c59ba
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