smapi.c revision 196037
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 196037 2009-08-02 14:28:40Z attilio $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33 34#include <sys/module.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37 38#include <machine/bus.h> 39#include <machine/resource.h> 40#include <sys/rman.h> 41 42/* And all this for BIOS_PADDRTOVADDR() */ 43#include <vm/vm.h> 44#include <vm/vm_param.h> 45#include <vm/pmap.h> 46#include <machine/md_var.h> 47#include <machine/pc/bios.h> 48 49#include <machine/smapi.h> 50 51#define SMAPI_START 0xf0000 52#define SMAPI_STEP 0x10 53#define SMAPI_OFF 0 54#define SMAPI_LEN 4 55#define SMAPI_SIG "$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 (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 101{ 102 struct smapi_softc *sc; 103 int error; 104 105 error = 0; 106 sc = devclass_get_softc(smapi_devclass, dev2unit(dev)); 107 if (sc == NULL) { 108 error = ENXIO; 109 goto fail; 110 } 111 112 switch (cmd) { 113 case SMAPIOGHEADER: 114 bcopy((caddr_t)sc->header, data, 115 sizeof(struct smapi_bios_header)); 116 error = 0; 117 break; 118 case SMAPIOCGFUNCTION: 119 smapi32_offset = sc->smapi32_entry; 120 error = smapi32((struct smapi_bios_parameter *)data, 121 (struct smapi_bios_parameter *)data); 122 break; 123 default: 124 error = ENOTTY; 125 } 126 127fail: 128 return (error); 129} 130 131static int 132smapi_header_cksum (struct smapi_bios_header *header) 133{ 134 u_int8_t *ptr; 135 u_int8_t cksum; 136 int i; 137 138 ptr = (u_int8_t *)header; 139 cksum = 0; 140 for (i = 0; i < header->length; i++) { 141 cksum += ptr[i]; 142 } 143 144 return (cksum); 145} 146 147static void 148smapi_identify (driver_t *driver, device_t parent) 149{ 150 device_t child; 151 u_int32_t addr; 152 int length; 153 int rid; 154 155 if (!device_is_alive(parent)) 156 return; 157 158 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN, 159 SMAPI_STEP, SMAPI_OFF); 160 if (addr != 0) { 161 rid = 0; 162 length = ADDR2HDR(addr)->length; 163 164 child = BUS_ADD_CHILD(parent, 5, "smapi", -1); 165 device_set_driver(child, driver); 166 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 167 device_set_desc(child, "SMAPI BIOS"); 168 } 169 170 return; 171} 172 173static int 174smapi_probe (device_t dev) 175{ 176 struct resource *res; 177 int rid; 178 int error; 179 180 error = 0; 181 rid = 0; 182 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 183 if (res == NULL) { 184 device_printf(dev, "Unable to allocate memory resource.\n"); 185 error = ENOMEM; 186 goto bad; 187 } 188 189 if (smapi_header_cksum(RES2HDR(res))) { 190 device_printf(dev, "SMAPI header checksum failed.\n"); 191 error = ENXIO; 192 goto bad; 193 } 194 195bad: 196 if (res) 197 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 198 return (error); 199} 200 201static int 202smapi_attach (device_t dev) 203{ 204 struct smapi_softc *sc; 205 int error; 206 207 sc = device_get_softc(dev); 208 error = 0; 209 210 sc->dev = dev; 211 sc->rid = 0; 212 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 213 RF_ACTIVE); 214 if (sc->res == NULL) { 215 device_printf(dev, "Unable to allocate memory resource.\n"); 216 error = ENOMEM; 217 goto bad; 218 } 219 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res); 220 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR( 221 sc->header->prot32_segment + 222 sc->header->prot32_offset); 223 224 sc->cdev = make_dev(&smapi_cdevsw, 225 device_get_unit(sc->dev), 226 UID_ROOT, GID_WHEEL, 0600, 227 "%s%d", 228 smapi_cdevsw.d_name, 229 device_get_unit(sc->dev)); 230 231 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n", 232 bcd2bin(sc->header->version_major), 233 bcd2bin(sc->header->version_minor), 234 sc->header->length, 235 sc->header->checksum); 236 device_printf(dev, "Information=0x%b\n", 237 sc->header->information, 238 "\020" 239 "\001REAL_VM86" 240 "\002PROTECTED_16" 241 "\003PROTECTED_32"); 242 243 if (bootverbose) { 244 if (sc->header->information & SMAPI_REAL_VM86) 245 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n", 246 sc->header->real16_segment, 247 sc->header->real16_offset); 248 if (sc->header->information & SMAPI_PROT_16BIT) 249 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n", 250 sc->header->prot16_segment, 251 sc->header->prot16_offset); 252 if (sc->header->information & SMAPI_PROT_32BIT) 253 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n", 254 sc->header->prot32_segment, 255 sc->header->prot32_offset); 256 } 257 258 return (0); 259bad: 260 if (sc->res) 261 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 262 return (error); 263} 264 265static int 266smapi_detach (device_t dev) 267{ 268 struct smapi_softc *sc; 269 270 sc = device_get_softc(dev); 271 272 destroy_dev(sc->cdev); 273 274 if (sc->res) 275 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 276 277 return (0); 278} 279 280static int 281smapi_modevent (module_t mod, int what, void *arg) 282{ 283 device_t * devs; 284 int count; 285 int i; 286 287 switch (what) { 288 case MOD_LOAD: 289 break; 290 case MOD_UNLOAD: 291 newbus_xlock(); 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 newbus_xunlock(); 297 break; 298 default: 299 break; 300 } 301 302 return (0); 303} 304 305static 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 314static driver_t smapi_driver = { 315 "smapi", 316 smapi_methods, 317 sizeof(struct smapi_softc), 318}; 319 320DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0); 321MODULE_VERSION(smapi, 1); 322