1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.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 static d_ioctl_t smapi_ioctl;
75
76 static struct cdevsw smapi_cdevsw = {
77 .d_version = D_VERSION,
78 .d_ioctl = smapi_ioctl,
79 .d_name = "smapi",
80 .d_flags = D_NEEDGIANT,
81 };
82
83 static void smapi_identify(driver_t *, device_t);
84 static int smapi_probe(device_t);
85 static int smapi_attach(device_t);
86 static int smapi_detach(device_t);
87 static int smapi_modevent(module_t, int, void *);
88
89 static int smapi_header_cksum(struct smapi_bios_header *);
90
91 extern int smapi32(struct smapi_bios_parameter *,
92 struct smapi_bios_parameter *);
93 extern int smapi32_new(u_long, u_short,
94 struct smapi_bios_parameter *,
95 struct smapi_bios_parameter *);
96
97 static int
smapi_ioctl(struct cdev * dev,u_long cmd,caddr_t data,int fflag,struct thread * td)98 smapi_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
99 {
100 struct smapi_softc *sc = dev->si_drv1;
101 int error;
102
103 switch (cmd) {
104 case SMAPIOGHEADER:
105 bcopy((caddr_t)sc->header, data,
106 sizeof(struct smapi_bios_header));
107 error = 0;
108 break;
109 case SMAPIOCGFUNCTION:
110 smapi32_offset = sc->smapi32_entry;
111 error = smapi32((struct smapi_bios_parameter *)data,
112 (struct smapi_bios_parameter *)data);
113 break;
114 default:
115 error = ENOTTY;
116 }
117
118 return (error);
119 }
120
121 static int
smapi_header_cksum(struct smapi_bios_header * header)122 smapi_header_cksum (struct smapi_bios_header *header)
123 {
124 u_int8_t *ptr;
125 u_int8_t cksum;
126 int i;
127
128 ptr = (u_int8_t *)header;
129 cksum = 0;
130 for (i = 0; i < header->length; i++) {
131 cksum += ptr[i];
132 }
133
134 return (cksum);
135 }
136
137 static void
smapi_identify(driver_t * driver,device_t parent)138 smapi_identify (driver_t *driver, device_t parent)
139 {
140 device_t child;
141 u_int32_t addr;
142 int length;
143 int rid;
144
145 if (!device_is_alive(parent))
146 return;
147
148 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN,
149 SMAPI_STEP, SMAPI_OFF);
150 if (addr != 0) {
151 rid = 0;
152 length = ADDR2HDR(addr)->length;
153
154 child = BUS_ADD_CHILD(parent, 5, "smapi", DEVICE_UNIT_ANY);
155 device_set_driver(child, driver);
156 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
157 device_set_desc(child, "SMAPI BIOS");
158 }
159
160 return;
161 }
162
163 static int
smapi_probe(device_t dev)164 smapi_probe (device_t dev)
165 {
166 struct resource *res;
167 int rid;
168 int error;
169
170 error = 0;
171 rid = 0;
172 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
173 if (res == NULL) {
174 device_printf(dev, "Unable to allocate memory resource.\n");
175 error = ENOMEM;
176 goto bad;
177 }
178
179 if (smapi_header_cksum(RES2HDR(res))) {
180 device_printf(dev, "SMAPI header checksum failed.\n");
181 error = ENXIO;
182 goto bad;
183 }
184
185 bad:
186 if (res)
187 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
188 return (error);
189 }
190
191 static int
smapi_attach(device_t dev)192 smapi_attach (device_t dev)
193 {
194 struct make_dev_args args;
195 struct smapi_softc *sc;
196 int error;
197
198 sc = device_get_softc(dev);
199 error = 0;
200
201 sc->dev = dev;
202 sc->rid = 0;
203 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
204 RF_ACTIVE);
205 if (sc->res == NULL) {
206 device_printf(dev, "Unable to allocate memory resource.\n");
207 error = ENOMEM;
208 goto bad;
209 }
210 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res);
211 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR(
212 sc->header->prot32_segment +
213 sc->header->prot32_offset);
214
215 make_dev_args_init(&args);
216 args.mda_devsw = &smapi_cdevsw;
217 args.mda_uid = UID_ROOT;
218 args.mda_gid = GID_WHEEL;
219 args.mda_mode = 0600;
220 args.mda_si_drv1 = sc;
221 error = make_dev_s(&args, &sc->cdev, "%s%d",
222 smapi_cdevsw.d_name,
223 device_get_unit(sc->dev));
224 if (error != 0)
225 goto bad;
226
227 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n",
228 bcd2bin(sc->header->version_major),
229 bcd2bin(sc->header->version_minor),
230 sc->header->length,
231 sc->header->checksum);
232 device_printf(dev, "Information=0x%b\n",
233 sc->header->information,
234 "\020"
235 "\001REAL_VM86"
236 "\002PROTECTED_16"
237 "\003PROTECTED_32");
238
239 if (bootverbose) {
240 if (sc->header->information & SMAPI_REAL_VM86)
241 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n",
242 sc->header->real16_segment,
243 sc->header->real16_offset);
244 if (sc->header->information & SMAPI_PROT_16BIT)
245 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n",
246 sc->header->prot16_segment,
247 sc->header->prot16_offset);
248 if (sc->header->information & SMAPI_PROT_32BIT)
249 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n",
250 sc->header->prot32_segment,
251 sc->header->prot32_offset);
252 }
253
254 return (0);
255 bad:
256 if (sc->res)
257 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
258 return (error);
259 }
260
261 static int
smapi_detach(device_t dev)262 smapi_detach (device_t dev)
263 {
264 struct smapi_softc *sc;
265
266 sc = device_get_softc(dev);
267
268 destroy_dev(sc->cdev);
269
270 if (sc->res)
271 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
272
273 return (0);
274 }
275
276 static device_method_t smapi_methods[] = {
277 /* Device interface */
278 DEVMETHOD(device_identify, smapi_identify),
279 DEVMETHOD(device_probe, smapi_probe),
280 DEVMETHOD(device_attach, smapi_attach),
281 DEVMETHOD(device_detach, smapi_detach),
282 { 0, 0 }
283 };
284
285 static driver_t smapi_driver = {
286 "smapi",
287 smapi_methods,
288 sizeof(struct smapi_softc),
289 };
290
291 static int
smapi_modevent(module_t mod,int what,void * arg)292 smapi_modevent (module_t mod, int what, void *arg)
293 {
294 device_t * devs;
295 int count;
296 int i;
297
298 switch (what) {
299 case MOD_LOAD:
300 break;
301 case MOD_UNLOAD:
302 devclass_get_devices(devclass_find(smapi_driver.name), &devs,
303 &count);
304 for (i = 0; i < count; i++) {
305 device_delete_child(device_get_parent(devs[i]), devs[i]);
306 }
307 free(devs, M_TEMP);
308 break;
309 default:
310 break;
311 }
312
313 return (0);
314 }
315
316 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_modevent, NULL);
317 MODULE_VERSION(smapi, 1);
318