Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/bios/smapi.c
Version:
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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: releng/10.0/sys/i386/bios/smapi.c 241073 2012-09-30 15:42:20Z kevlo $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 35 #include <sys/module.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 39 #include <machine/bus.h> 40 #include <machine/resource.h> 41 #include <sys/rman.h> 42 43 /* And all this for BIOS_PADDRTOVADDR() */ 44 #include <vm/vm.h> 45 #include <vm/vm_param.h> 46 #include <vm/pmap.h> 47 #include <machine/md_var.h> 48 #include <machine/pc/bios.h> 49 50 #include <machine/smapi.h> 51 52 #define SMAPI_START 0xf0000 53 #define SMAPI_STEP 0x10 54 #define SMAPI_OFF 0 55 #define SMAPI_LEN 4 56 #define SMAPI_SIG "$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_MEM | 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: 5a1052b49a87bf80466f10aad6b4d8ea
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