smapi.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/sys/i386/bios/smapi.c 330897 2018-03-14 03:19:51Z eadler $"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/kernel.h> 35#include <sys/malloc.h> 36 37#include <sys/module.h> 38#include <sys/bus.h> 39#include <sys/conf.h> 40 41#include <machine/bus.h> 42#include <machine/resource.h> 43#include <sys/rman.h> 44 45/* And all this for BIOS_PADDRTOVADDR() */ 46#include <vm/vm.h> 47#include <vm/vm_param.h> 48#include <vm/pmap.h> 49#include <machine/md_var.h> 50#include <machine/pc/bios.h> 51 52#include <machine/smapi.h> 53 54#define SMAPI_START 0xf0000 55#define SMAPI_STEP 0x10 56#define SMAPI_OFF 0 57#define SMAPI_LEN 4 58#define SMAPI_SIG "$SMB" 59 60#define RES2HDR(res) ((struct smapi_bios_header *)rman_get_virtual(res)) 61#define ADDR2HDR(addr) ((struct smapi_bios_header *)BIOS_PADDRTOVADDR(addr)) 62 63struct smapi_softc { 64 struct cdev * cdev; 65 device_t dev; 66 struct resource * res; 67 int rid; 68 69 u_int32_t smapi32_entry; 70 71 struct smapi_bios_header *header; 72}; 73 74extern u_long smapi32_offset; 75extern u_short smapi32_segment; 76 77devclass_t smapi_devclass; 78 79static d_ioctl_t smapi_ioctl; 80 81static struct cdevsw smapi_cdevsw = { 82 .d_version = D_VERSION, 83 .d_ioctl = smapi_ioctl, 84 .d_name = "smapi", 85 .d_flags = D_NEEDGIANT, 86}; 87 88static void smapi_identify(driver_t *, device_t); 89static int smapi_probe(device_t); 90static int smapi_attach(device_t); 91static int smapi_detach(device_t); 92static int smapi_modevent(module_t, int, void *); 93 94static int smapi_header_cksum(struct smapi_bios_header *); 95 96extern int smapi32(struct smapi_bios_parameter *, 97 struct smapi_bios_parameter *); 98extern int smapi32_new(u_long, u_short, 99 struct smapi_bios_parameter *, 100 struct smapi_bios_parameter *); 101 102static int 103smapi_ioctl (struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 104{ 105 struct smapi_softc *sc; 106 int error; 107 108 error = 0; 109 sc = devclass_get_softc(smapi_devclass, dev2unit(dev)); 110 if (sc == NULL) { 111 error = ENXIO; 112 goto fail; 113 } 114 115 switch (cmd) { 116 case SMAPIOGHEADER: 117 bcopy((caddr_t)sc->header, data, 118 sizeof(struct smapi_bios_header)); 119 error = 0; 120 break; 121 case SMAPIOCGFUNCTION: 122 smapi32_offset = sc->smapi32_entry; 123 error = smapi32((struct smapi_bios_parameter *)data, 124 (struct smapi_bios_parameter *)data); 125 break; 126 default: 127 error = ENOTTY; 128 } 129 130fail: 131 return (error); 132} 133 134static int 135smapi_header_cksum (struct smapi_bios_header *header) 136{ 137 u_int8_t *ptr; 138 u_int8_t cksum; 139 int i; 140 141 ptr = (u_int8_t *)header; 142 cksum = 0; 143 for (i = 0; i < header->length; i++) { 144 cksum += ptr[i]; 145 } 146 147 return (cksum); 148} 149 150static void 151smapi_identify (driver_t *driver, device_t parent) 152{ 153 device_t child; 154 u_int32_t addr; 155 int length; 156 int rid; 157 158 if (!device_is_alive(parent)) 159 return; 160 161 addr = bios_sigsearch(SMAPI_START, SMAPI_SIG, SMAPI_LEN, 162 SMAPI_STEP, SMAPI_OFF); 163 if (addr != 0) { 164 rid = 0; 165 length = ADDR2HDR(addr)->length; 166 167 child = BUS_ADD_CHILD(parent, 5, "smapi", -1); 168 device_set_driver(child, driver); 169 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 170 device_set_desc(child, "SMAPI BIOS"); 171 } 172 173 return; 174} 175 176static int 177smapi_probe (device_t dev) 178{ 179 struct resource *res; 180 int rid; 181 int error; 182 183 error = 0; 184 rid = 0; 185 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 186 if (res == NULL) { 187 device_printf(dev, "Unable to allocate memory resource.\n"); 188 error = ENOMEM; 189 goto bad; 190 } 191 192 if (smapi_header_cksum(RES2HDR(res))) { 193 device_printf(dev, "SMAPI header checksum failed.\n"); 194 error = ENXIO; 195 goto bad; 196 } 197 198bad: 199 if (res) 200 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 201 return (error); 202} 203 204static int 205smapi_attach (device_t dev) 206{ 207 struct smapi_softc *sc; 208 int error; 209 210 sc = device_get_softc(dev); 211 error = 0; 212 213 sc->dev = dev; 214 sc->rid = 0; 215 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 216 RF_ACTIVE); 217 if (sc->res == NULL) { 218 device_printf(dev, "Unable to allocate memory resource.\n"); 219 error = ENOMEM; 220 goto bad; 221 } 222 sc->header = (struct smapi_bios_header *)rman_get_virtual(sc->res); 223 sc->smapi32_entry = (u_int32_t)BIOS_PADDRTOVADDR( 224 sc->header->prot32_segment + 225 sc->header->prot32_offset); 226 227 sc->cdev = make_dev(&smapi_cdevsw, 228 device_get_unit(sc->dev), 229 UID_ROOT, GID_WHEEL, 0600, 230 "%s%d", 231 smapi_cdevsw.d_name, 232 device_get_unit(sc->dev)); 233 234 device_printf(dev, "Version: %d.%02d, Length: %d, Checksum: 0x%02x\n", 235 bcd2bin(sc->header->version_major), 236 bcd2bin(sc->header->version_minor), 237 sc->header->length, 238 sc->header->checksum); 239 device_printf(dev, "Information=0x%b\n", 240 sc->header->information, 241 "\020" 242 "\001REAL_VM86" 243 "\002PROTECTED_16" 244 "\003PROTECTED_32"); 245 246 if (bootverbose) { 247 if (sc->header->information & SMAPI_REAL_VM86) 248 device_printf(dev, "Real/VM86 mode: Segment 0x%04x, Offset 0x%04x\n", 249 sc->header->real16_segment, 250 sc->header->real16_offset); 251 if (sc->header->information & SMAPI_PROT_16BIT) 252 device_printf(dev, "16-bit Protected mode: Segment 0x%08x, Offset 0x%04x\n", 253 sc->header->prot16_segment, 254 sc->header->prot16_offset); 255 if (sc->header->information & SMAPI_PROT_32BIT) 256 device_printf(dev, "32-bit Protected mode: Segment 0x%08x, Offset 0x%08x\n", 257 sc->header->prot32_segment, 258 sc->header->prot32_offset); 259 } 260 261 return (0); 262bad: 263 if (sc->res) 264 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 265 return (error); 266} 267 268static int 269smapi_detach (device_t dev) 270{ 271 struct smapi_softc *sc; 272 273 sc = device_get_softc(dev); 274 275 destroy_dev(sc->cdev); 276 277 if (sc->res) 278 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 279 280 return (0); 281} 282 283static int 284smapi_modevent (module_t mod, int what, void *arg) 285{ 286 device_t * devs; 287 int count; 288 int i; 289 290 switch (what) { 291 case MOD_LOAD: 292 break; 293 case MOD_UNLOAD: 294 devclass_get_devices(smapi_devclass, &devs, &count); 295 for (i = 0; i < count; i++) { 296 device_delete_child(device_get_parent(devs[i]), devs[i]); 297 } 298 free(devs, M_TEMP); 299 break; 300 default: 301 break; 302 } 303 304 return (0); 305} 306 307static device_method_t smapi_methods[] = { 308 /* Device interface */ 309 DEVMETHOD(device_identify, smapi_identify), 310 DEVMETHOD(device_probe, smapi_probe), 311 DEVMETHOD(device_attach, smapi_attach), 312 DEVMETHOD(device_detach, smapi_detach), 313 { 0, 0 } 314}; 315 316static driver_t smapi_driver = { 317 "smapi", 318 smapi_methods, 319 sizeof(struct smapi_softc), 320}; 321 322DRIVER_MODULE(smapi, nexus, smapi_driver, smapi_devclass, smapi_modevent, 0); 323MODULE_VERSION(smapi, 1); 324