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