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/pmap.h> 45 #include <machine/md_var.h> 46 #include <machine/pc/bios.h> 47 48 #include <machine/smapi.h> 49 50 #define SMAPI_START 0xf0000 51 #define SMAPI_STEP 0x10 52 #define SMAPI_OFF 0 53 #define SMAPI_LEN 4 54 #define SMAPI_SIG "$SMB" 55 56 #define RES2HDR(res) ((struct smapi_bios_header *)rman_get_virtual(res)) 57 #define ADDR2HDR(addr) ((struct smapi_bios_header *)BIOS_PADDRTOVADDR(addr)) 58 59 struct smapi_softc { 60 dev_t cdev; 61 device_t dev; 62 struct resource * res; 63 int rid; 64 65 u_int32_t smapi32_entry; 66 67 struct smapi_bios_header *header; 68 }; 69 70 extern u_long smapi32_offset; 71 extern u_short smapi32_segment; 72 73 devclass_t smapi_devclass; 74 75 static d_ioctl_t smapi_ioctl; 76 77 static struct cdevsw smapi_cdevsw = { 78 .d_open = nullopen, 79 .d_close = nullclose, 80 .d_ioctl = smapi_ioctl, 81 .d_name = "smapi", 82 .d_maj = MAJOR_AUTO, 83 .d_flags = D_MEM, 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 (dev, cmd, data, fflag, td) 102 dev_t dev; 103 u_long cmd; 104 caddr_t data; 105 int fflag; 106 d_thread_t * td; 107 { 108 struct smapi_softc *sc; 109 int error; 110 111 error = 0; 112 sc = devclass_get_softc(smapi_devclass, minor(dev)); 113 if (sc == NULL) { 114 error = ENXIO; 115 goto fail; 116 } 117 118 switch (cmd) { 119 case SMAPIOGHEADER: 120 bcopy((caddr_t)sc->header, data, 121 sizeof(struct smapi_bios_header)); 122 error = 0; 123 break; 124 case SMAPIOCGFUNCTION: 125 smapi32_offset = sc->smapi32_entry; 126 error = smapi32((struct smapi_bios_parameter *)data, 127 (struct smapi_bios_parameter *)data); 128 break; 129 default: 130 error = ENOTTY; 131 } 132 133 fail: 134 return (error); 135 } 136 137 static int 138 smapi_header_cksum (struct smapi_bios_header *header) 139 { 140 u_int8_t *ptr; 141 u_int8_t cksum; 142 int i; 143 144 ptr = (u_int8_t *)header; 145 cksum = 0; 146 for (i = 0; i < header->length; i++) { 147 cksum += ptr[i]; 148 } 149 150 return (cksum); 151 } 152 153 static void 154 smapi_identify (driver_t *driver, device_t parent) 155 { 156 device_t child; 157 u_int32_t addr; 158 int length; 159 int rid; 160 161 if (!device_is_alive(parent)) 162 return; 163 164 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN, 165 SMAPI_STEP, SMAPI_OFF); 166 if (addr != 0) { 167 rid = 0; 168 length = ADDR2HDR(addr)->length; 169 170 child = BUS_ADD_CHILD(parent, 0, "smapi", -1); 171 device_set_driver(child, driver); 172 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 173 device_set_desc(child, "SMAPI BIOS"); 174 } 175 176 return; 177 } 178 179 static int 180 smapi_probe (device_t dev) 181 { 182 struct resource *res; 183 int rid; 184 int error; 185 186 error = 0; 187 rid = 0; 188 res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, 189 0ul, ~0ul, 1, RF_ACTIVE); 190 if (res == NULL) { 191 device_printf(dev, "Unable to allocate memory resource.\n"); 192 error = ENOMEM; 193 goto bad; 194 } 195 196 if (smapi_header_cksum(RES2HDR(res))) { 197 device_printf(dev, "SMAPI header checksum failed.\n"); 198 error = ENXIO; 199 goto bad; 200 } 201 202 bad: 203 if (res) 204 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 205 return (error); 206 } 207 208 static int 209 smapi_attach (device_t dev) 210 { 211 struct smapi_softc *sc; 212 int error; 213 214 sc = device_get_softc(dev); 215 error = 0; 216 217 sc->dev = dev; 218 sc->rid = 0; 219 sc->res = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->rid, 220 0ul, ~0ul, 1, RF_ACTIVE); 221 if (sc->res == NULL) { 222 device_printf(dev, "Unable to allocate memory resource.\n"); 223 error = ENOMEM; 224 goto bad; 225 } 226 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res); 227 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR( 228 sc->header->prot32_segment + 229 sc->header->prot32_offset); 230 231 sc->cdev = make_dev(&smapi_cdevsw, 232 device_get_unit(sc->dev), 233 UID_ROOT, GID_WHEEL, 0600, 234 "%s%d", 235 smapi_cdevsw.d_name, 236 device_get_unit(sc->dev)); 237 238 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n", 239 bcd2bin(sc->header->version_major), 240 bcd2bin(sc->header->version_minor), 241 sc->header->length, 242 sc->header->checksum); 243 device_printf(dev, "Information=0x%b\n", 244 sc->header->information, 245 "\020" 246 "\001REAL_VM86" 247 "\002PROTECTED_16" 248 "\003PROTECTED_32"); 249 250 if (bootverbose) { 251 if (sc->header->information & SMAPI_REAL_VM86) 252 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n", 253 sc->header->real16_segment, 254 sc->header->real16_offset); 255 if (sc->header->information & SMAPI_PROT_16BIT) 256 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n", 257 sc->header->prot16_segment, 258 sc->header->prot16_offset); 259 if (sc->header->information & SMAPI_PROT_32BIT) 260 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n", 261 sc->header->prot32_segment, 262 sc->header->prot32_offset); 263 } 264 265 return (0); 266 bad: 267 if (sc->res) 268 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 269 return (error); 270 } 271 272 static int 273 smapi_detach (device_t dev) 274 { 275 struct smapi_softc *sc; 276 277 sc = device_get_softc(dev); 278 279 destroy_dev(sc->cdev); 280 281 if (sc->res) 282 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 283 284 return (0); 285 } 286 287 static int 288 smapi_modevent (mod, what, arg) 289 module_t mod; 290 int what; 291 void * arg; 292 { 293 device_t * devs; 294 int count; 295 int i; 296 297 switch (what) { 298 case MOD_LOAD: 299 break; 300 case MOD_UNLOAD: 301 devclass_get_devices(smapi_devclass, &devs, &count); 302 for (i = 0; i < count; i++) { 303 device_delete_child(device_get_parent(devs[i]), devs[i]); 304 } 305 break; 306 default: 307 break; 308 } 309 310 return (0); 311 } 312 313 static device_method_t smapi_methods[] = { 314 /* Device interface */ 315 DEVMETHOD(device_identify, smapi_identify), 316 DEVMETHOD(device_probe, smapi_probe), 317 DEVMETHOD(device_attach, smapi_attach), 318 DEVMETHOD(device_detach, smapi_detach), 319 { 0, 0 } 320 }; 321 322 static driver_t smapi_driver = { 323 "smapi", 324 smapi_methods, 325 sizeof(struct smapi_softc), 326 }; 327 328 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0); 329 MODULE_VERSION(smapi, 1); 330