smapi.c revision 167742
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: head/sys/i386/bios/smapi.c 167742 2007-03-20 20:21:44Z jhb $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33 34#include <sys/module.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37 38#include <machine/bus.h> 39#include <machine/resource.h> 40#include <sys/rman.h> 41 42/* And all this for BIOS_PADDRTOVADDR() */ 43#include <vm/vm.h> 44#include <vm/vm_param.h> 45#include <vm/pmap.h> 46#include <machine/md_var.h> 47#include <machine/pc/bios.h> 48 49#include <machine/smapi.h> 50 51#define SMAPI_START 0xf0000 52#define SMAPI_STEP 0x10 53#define SMAPI_OFF 0 54#define SMAPI_LEN 4 55#define SMAPI_SIG "$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 60struct 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 71extern u_long smapi32_offset; 72extern u_short smapi32_segment; 73 74devclass_t smapi_devclass; 75 76static d_ioctl_t smapi_ioctl; 77 78static 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 85static void smapi_identify (driver_t *, device_t); 86static int smapi_probe (device_t); 87static int smapi_attach (device_t); 88static int smapi_detach (device_t); 89static int smapi_modevent (module_t, int, void *); 90 91static int smapi_header_cksum (struct smapi_bios_header *); 92 93extern int smapi32 (struct smapi_bios_parameter *, 94 struct smapi_bios_parameter *); 95extern int smapi32_new (u_long, u_short, 96 struct smapi_bios_parameter *, 97 struct smapi_bios_parameter *); 98 99static int 100smapi_ioctl (dev, cmd, data, fflag, td) 101 struct cdev *dev; 102 u_long cmd; 103 caddr_t data; 104 int fflag; 105 d_thread_t * td; 106{ 107 struct smapi_softc *sc; 108 int error; 109 110 error = 0; 111 sc = devclass_get_softc(smapi_devclass, minor(dev)); 112 if (sc == NULL) { 113 error = ENXIO; 114 goto fail; 115 } 116 117 switch (cmd) { 118 case SMAPIOGHEADER: 119 bcopy((caddr_t)sc->header, data, 120 sizeof(struct smapi_bios_header)); 121 error = 0; 122 break; 123 case SMAPIOCGFUNCTION: 124 smapi32_offset = sc->smapi32_entry; 125 error = smapi32((struct smapi_bios_parameter *)data, 126 (struct smapi_bios_parameter *)data); 127 break; 128 default: 129 error = ENOTTY; 130 } 131 132fail: 133 return (error); 134} 135 136static int 137smapi_header_cksum (struct smapi_bios_header *header) 138{ 139 u_int8_t *ptr; 140 u_int8_t cksum; 141 int i; 142 143 ptr = (u_int8_t *)header; 144 cksum = 0; 145 for (i = 0; i < header->length; i++) { 146 cksum += ptr[i]; 147 } 148 149 return (cksum); 150} 151 152static void 153smapi_identify (driver_t *driver, device_t parent) 154{ 155 device_t child; 156 u_int32_t addr; 157 int length; 158 int rid; 159 160 if (!device_is_alive(parent)) 161 return; 162 163 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN, 164 SMAPI_STEP, SMAPI_OFF); 165 if (addr != 0) { 166 rid = 0; 167 length = ADDR2HDR(addr)->length; 168 169 child = BUS_ADD_CHILD(parent, 5, "smapi", -1); 170 device_set_driver(child, driver); 171 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 172 device_set_desc(child, "SMAPI BIOS"); 173 } 174 175 return; 176} 177 178static int 179smapi_probe (device_t dev) 180{ 181 struct resource *res; 182 int rid; 183 int error; 184 185 error = 0; 186 rid = 0; 187 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 188 if (res == NULL) { 189 device_printf(dev, "Unable to allocate memory resource.\n"); 190 error = ENOMEM; 191 goto bad; 192 } 193 194 if (smapi_header_cksum(RES2HDR(res))) { 195 device_printf(dev, "SMAPI header checksum failed.\n"); 196 error = ENXIO; 197 goto bad; 198 } 199 200bad: 201 if (res) 202 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 203 return (error); 204} 205 206static int 207smapi_attach (device_t dev) 208{ 209 struct smapi_softc *sc; 210 int error; 211 212 sc = device_get_softc(dev); 213 error = 0; 214 215 sc->dev = dev; 216 sc->rid = 0; 217 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 218 RF_ACTIVE); 219 if (sc->res == NULL) { 220 device_printf(dev, "Unable to allocate memory resource.\n"); 221 error = ENOMEM; 222 goto bad; 223 } 224 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res); 225 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR( 226 sc->header->prot32_segment + 227 sc->header->prot32_offset); 228 229 sc->cdev = make_dev(&smapi_cdevsw, 230 device_get_unit(sc->dev), 231 UID_ROOT, GID_WHEEL, 0600, 232 "%s%d", 233 smapi_cdevsw.d_name, 234 device_get_unit(sc->dev)); 235 236 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n", 237 bcd2bin(sc->header->version_major), 238 bcd2bin(sc->header->version_minor), 239 sc->header->length, 240 sc->header->checksum); 241 device_printf(dev, "Information=0x%b\n", 242 sc->header->information, 243 "\020" 244 "\001REAL_VM86" 245 "\002PROTECTED_16" 246 "\003PROTECTED_32"); 247 248 if (bootverbose) { 249 if (sc->header->information & SMAPI_REAL_VM86) 250 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n", 251 sc->header->real16_segment, 252 sc->header->real16_offset); 253 if (sc->header->information & SMAPI_PROT_16BIT) 254 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n", 255 sc->header->prot16_segment, 256 sc->header->prot16_offset); 257 if (sc->header->information & SMAPI_PROT_32BIT) 258 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n", 259 sc->header->prot32_segment, 260 sc->header->prot32_offset); 261 } 262 263 return (0); 264bad: 265 if (sc->res) 266 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 267 return (error); 268} 269 270static int 271smapi_detach (device_t dev) 272{ 273 struct smapi_softc *sc; 274 275 sc = device_get_softc(dev); 276 277 destroy_dev(sc->cdev); 278 279 if (sc->res) 280 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 281 282 return (0); 283} 284 285static int 286smapi_modevent (mod, what, arg) 287 module_t mod; 288 int what; 289 void * arg; 290{ 291 device_t * devs; 292 int count; 293 int i; 294 295 switch (what) { 296 case MOD_LOAD: 297 break; 298 case MOD_UNLOAD: 299 devclass_get_devices(smapi_devclass, &devs, &count); 300 for (i = 0; i < count; i++) { 301 device_delete_child(device_get_parent(devs[i]), devs[i]); 302 } 303 break; 304 default: 305 break; 306 } 307 308 return (0); 309} 310 311static device_method_t smapi_methods[] = { 312 /* Device interface */ 313 DEVMETHOD(device_identify, smapi_identify), 314 DEVMETHOD(device_probe, smapi_probe), 315 DEVMETHOD(device_attach, smapi_attach), 316 DEVMETHOD(device_detach, smapi_detach), 317 { 0, 0 } 318}; 319 320static driver_t smapi_driver = { 321 "smapi", 322 smapi_methods, 323 sizeof(struct smapi_softc), 324}; 325 326DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0); 327MODULE_VERSION(smapi, 1); 328