1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/malloc.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 60 struct 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 71 extern u_long smapi32_offset; 72 extern u_short smapi32_segment; 73 74 static d_ioctl_t smapi_ioctl; 75 76 static struct cdevsw smapi_cdevsw = { 77 .d_version = D_VERSION, 78 .d_ioctl = smapi_ioctl, 79 .d_name = "smapi", 80 .d_flags = D_NEEDGIANT, 81 }; 82 83 static void smapi_identify(driver_t *, device_t); 84 static int smapi_probe(device_t); 85 static int smapi_attach(device_t); 86 static int smapi_detach(device_t); 87 static int smapi_modevent(module_t, int, void *); 88 89 static int smapi_header_cksum(struct smapi_bios_header *); 90 91 extern int smapi32(struct smapi_bios_parameter *, 92 struct smapi_bios_parameter *); 93 extern int smapi32_new(u_long, u_short, 94 struct smapi_bios_parameter *, 95 struct smapi_bios_parameter *); 96 97 static int 98 smapi_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 99 { 100 struct smapi_softc *sc = dev->si_drv1; 101 int error; 102 103 switch (cmd) { 104 case SMAPIOGHEADER: 105 bcopy((caddr_t)sc->header, data, 106 sizeof(struct smapi_bios_header)); 107 error = 0; 108 break; 109 case SMAPIOCGFUNCTION: 110 smapi32_offset = sc->smapi32_entry; 111 error = smapi32((struct smapi_bios_parameter *)data, 112 (struct smapi_bios_parameter *)data); 113 break; 114 default: 115 error = ENOTTY; 116 } 117 118 return (error); 119 } 120 121 static int 122 smapi_header_cksum (struct smapi_bios_header *header) 123 { 124 u_int8_t *ptr; 125 u_int8_t cksum; 126 int i; 127 128 ptr = (u_int8_t *)header; 129 cksum = 0; 130 for (i = 0; i < header->length; i++) { 131 cksum += ptr[i]; 132 } 133 134 return (cksum); 135 } 136 137 static void 138 smapi_identify (driver_t *driver, device_t parent) 139 { 140 device_t child; 141 u_int32_t addr; 142 int length; 143 int rid; 144 145 if (!device_is_alive(parent)) 146 return; 147 148 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN, 149 SMAPI_STEP, SMAPI_OFF); 150 if (addr != 0) { 151 rid = 0; 152 length = ADDR2HDR(addr)->length; 153 154 child = BUS_ADD_CHILD(parent, 5, "smapi", DEVICE_UNIT_ANY); 155 device_set_driver(child, driver); 156 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 157 device_set_desc(child, "SMAPI BIOS"); 158 } 159 160 return; 161 } 162 163 static int 164 smapi_probe (device_t dev) 165 { 166 struct resource *res; 167 int rid; 168 int error; 169 170 error = 0; 171 rid = 0; 172 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 173 if (res == NULL) { 174 device_printf(dev, "Unable to allocate memory resource.\n"); 175 error = ENOMEM; 176 goto bad; 177 } 178 179 if (smapi_header_cksum(RES2HDR(res))) { 180 device_printf(dev, "SMAPI header checksum failed.\n"); 181 error = ENXIO; 182 goto bad; 183 } 184 185 bad: 186 if (res) 187 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 188 return (error); 189 } 190 191 static int 192 smapi_attach (device_t dev) 193 { 194 struct make_dev_args args; 195 struct smapi_softc *sc; 196 int error; 197 198 sc = device_get_softc(dev); 199 error = 0; 200 201 sc->dev = dev; 202 sc->rid = 0; 203 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 204 RF_ACTIVE); 205 if (sc->res == NULL) { 206 device_printf(dev, "Unable to allocate memory resource.\n"); 207 error = ENOMEM; 208 goto bad; 209 } 210 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res); 211 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR( 212 sc->header->prot32_segment + 213 sc->header->prot32_offset); 214 215 make_dev_args_init(&args); 216 args.mda_devsw = &smapi_cdevsw; 217 args.mda_uid = UID_ROOT; 218 args.mda_gid = GID_WHEEL; 219 args.mda_mode = 0600; 220 args.mda_si_drv1 = sc; 221 error = make_dev_s(&args, &sc->cdev, "%s%d", 222 smapi_cdevsw.d_name, 223 device_get_unit(sc->dev)); 224 if (error != 0) 225 goto bad; 226 227 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n", 228 bcd2bin(sc->header->version_major), 229 bcd2bin(sc->header->version_minor), 230 sc->header->length, 231 sc->header->checksum); 232 device_printf(dev, "Information=0x%b\n", 233 sc->header->information, 234 "\020" 235 "\001REAL_VM86" 236 "\002PROTECTED_16" 237 "\003PROTECTED_32"); 238 239 if (bootverbose) { 240 if (sc->header->information & SMAPI_REAL_VM86) 241 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n", 242 sc->header->real16_segment, 243 sc->header->real16_offset); 244 if (sc->header->information & SMAPI_PROT_16BIT) 245 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n", 246 sc->header->prot16_segment, 247 sc->header->prot16_offset); 248 if (sc->header->information & SMAPI_PROT_32BIT) 249 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n", 250 sc->header->prot32_segment, 251 sc->header->prot32_offset); 252 } 253 254 return (0); 255 bad: 256 if (sc->res) 257 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 258 return (error); 259 } 260 261 static int 262 smapi_detach (device_t dev) 263 { 264 struct smapi_softc *sc; 265 266 sc = device_get_softc(dev); 267 268 destroy_dev(sc->cdev); 269 270 if (sc->res) 271 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 272 273 return (0); 274 } 275 276 static device_method_t smapi_methods[] = { 277 /* Device interface */ 278 DEVMETHOD(device_identify, smapi_identify), 279 DEVMETHOD(device_probe, smapi_probe), 280 DEVMETHOD(device_attach, smapi_attach), 281 DEVMETHOD(device_detach, smapi_detach), 282 { 0, 0 } 283 }; 284 285 static driver_t smapi_driver = { 286 "smapi", 287 smapi_methods, 288 sizeof(struct smapi_softc), 289 }; 290 291 static int 292 smapi_modevent (module_t mod, int what, void *arg) 293 { 294 device_t * devs; 295 int count; 296 int i; 297 298 switch (what) { 299 case MOD_LOAD: 300 break; 301 case MOD_UNLOAD: 302 devclass_get_devices(devclass_find(smapi_driver.name), &devs, 303 &count); 304 for (i = 0; i < count; i++) { 305 device_delete_child(device_get_parent(devs[i]), devs[i]); 306 } 307 free(devs, M_TEMP); 308 break; 309 default: 310 break; 311 } 312 313 return (0); 314 } 315 316 DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_modevent, NULL); 317 MODULE_VERSION(smapi, 1); 318