Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/autoconf.c
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1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91 37 * $FreeBSD$ 38 */ 39 40 /* 41 * Setup the system to run on the current machine. 42 * 43 * Configure() is called at boot time and initializes the vba 44 * device tables and the memory controller monitoring. Available 45 * devices are determined (from possibilities mentioned in ioconf.c), 46 * and the drivers are initialized. 47 */ 48 #include "opt_bootp.h" 49 #include "opt_ffs.h" 50 #include "opt_cd9660.h" 51 #include "opt_mfs.h" 52 #include "opt_nfsroot.h" 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/conf.h> 57 #include <sys/disklabel.h> 58 #include <sys/diskslice.h> 59 #include <sys/reboot.h> 60 #include <sys/kernel.h> 61 #include <sys/malloc.h> 62 #include <sys/mount.h> 63 #include <sys/sysctl.h> 64 65 #include <machine/bootinfo.h> 66 #include <machine/cons.h> 67 #include <machine/ipl.h> 68 #include <machine/md_var.h> 69 #ifdef APIC_IO 70 #include <machine/smp.h> 71 #endif /* APIC_IO */ 72 73 #include <i386/isa/icu.h> 74 75 #include "isa.h" 76 #if NISA > 0 77 #include <i386/isa/isa_device.h> 78 #endif 79 80 #include "pnp.h" 81 #if NPNP > 0 82 #include <i386/isa/pnp.h> 83 #endif 84 85 #include "eisa.h" 86 #if NEISA > 0 87 #include <i386/eisa/eisaconf.h> 88 #endif 89 90 #include "pci.h" 91 #if NPCI > 0 92 #include <pci/pcivar.h> 93 #endif 94 95 #include <sys/bus.h> 96 97 static void configure_first __P((void *)); 98 static void configure __P((void *)); 99 static void configure_final __P((void *)); 100 101 static void configure_finish __P((void)); 102 static void configure_start __P((void)); 103 static int setdumpdev __P((dev_t dev)); 104 static void setroot __P((void)); 105 106 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL); 107 /* SI_ORDER_SECOND is hookable */ 108 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL); 109 /* SI_ORDER_MIDDLE is hookable */ 110 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL); 111 112 113 #if defined(CD9660) || defined(CD9660_ROOT) 114 115 #include <sys/fcntl.h> 116 #include <sys/proc.h> 117 #include <sys/stat.h> 118 #include <machine/clock.h> 119 120 /* 121 * XXX All this CD-ROM root stuff is fairly messy. Ick. 122 * 123 * We need to try out all our potential CDROM drives, so we need a table. 124 */ 125 static struct { 126 char *name; 127 int major; 128 } try_cdrom[] = { 129 { "cd", 6 }, 130 { "mcd", 7 }, 131 { "scd", 16 }, 132 { "matcd", 17 }, 133 { "wcd", 19 }, 134 { 0, 0} 135 }; 136 137 static int find_cdrom_root __P((void)); 138 139 static int 140 find_cdrom_root() 141 { 142 int i, j, error; 143 struct cdevsw *bd; 144 dev_t orootdev; 145 146 #if CD9660_ROOTDELAY > 0 147 DELAY(CD9660_ROOTDELAY * 1000000); 148 #endif 149 orootdev = rootdev; 150 for (i = 0 ; i < 2; i++) 151 for (j = 0 ; try_cdrom[j].name ; j++) { 152 if (try_cdrom[j].major >= nblkdev) 153 continue; 154 rootdev = makedev(try_cdrom[j].major, i * 8); 155 bd = bdevsw[major(rootdev)]; 156 if (bd == NULL || bd->d_open == NULL) 157 continue; 158 if (bootverbose) 159 printf("trying %s%d as rootdev (0x%x)\n", 160 try_cdrom[j].name, i, rootdev); 161 error = (bd->d_open)(rootdev, FREAD, S_IFBLK, curproc); 162 if (error == 0) { 163 if (bd->d_close != NULL) 164 (bd->d_close)(rootdev, FREAD, S_IFBLK, 165 curproc); 166 return 0; 167 } 168 } 169 170 rootdev = orootdev; 171 return EINVAL; 172 } 173 #endif /* CD9660 || CD9660_ROOT */ 174 175 #ifdef MFS_ROOT 176 extern u_char *mfs_getimage __P((void)); 177 #endif 178 179 static void 180 configure_start() 181 { 182 } 183 184 static void 185 configure_finish() 186 { 187 } 188 189 /* 190 * Determine i/o configuration for a machine. 191 */ 192 static void 193 configure_first(dummy) 194 void *dummy; 195 { 196 197 configure_start(); /* DDB hook? */ 198 } 199 200 static void 201 configure(dummy) 202 void *dummy; 203 { 204 205 /* Allow all routines to decide for themselves if they want intrs */ 206 /* 207 * XXX Since this cannot be achieved on all architectures, we should 208 * XXX go back to disabling all interrupts until configuration is 209 * XXX completed and switch any devices that rely on the current 210 * XXX behavior to no longer rely on interrupts or to register an 211 * XXX interrupt_driven_config_hook for the task. 212 */ 213 /* 214 * XXX The above is wrong, because we're implicitly at splhigh(), 215 * XXX and should stay there, so enabling interrupts in the CPU 216 * XXX and the ICU at most gives pending interrupts which just get 217 * XXX in the way. 218 */ 219 #ifdef APIC_IO 220 bsp_apic_configure(); 221 enable_intr(); 222 #else 223 enable_intr(); 224 INTREN(IRQ_SLAVE); 225 #endif /* APIC_IO */ 226 227 #if NEISA > 0 228 eisa_configure(); 229 #endif 230 231 #if NPCI > 0 232 pci_configure(); 233 #endif 234 235 #if NPNP > 0 236 pnp_configure(); 237 #endif 238 239 #if NISA > 0 240 isa_configure(); 241 #endif 242 243 /* initialize new bus architecture */ 244 root_bus_configure(); 245 246 /* 247 * Now we're ready to handle (pending) interrupts. 248 * XXX this is slightly misplaced. 249 */ 250 spl0(); 251 252 /* 253 * Allow lowering of the ipl to the lowest kernel level if we 254 * panic (or call tsleep() before clearing `cold'). No level is 255 * completely safe (since a panic may occur in a critical region 256 * at splhigh()), but we want at least bio interrupts to work. 257 */ 258 safepri = cpl; 259 } 260 261 static void 262 configure_final(dummy) 263 void *dummy; 264 { 265 int i; 266 267 configure_finish(); /* DDB hook? */ 268 269 cninit_finish(); 270 271 if (bootverbose) { 272 273 #ifdef APIC_IO 274 imen_dump(); 275 #endif /* APIC_IO */ 276 277 /* 278 * Print out the BIOS's idea of the disk geometries. 279 */ 280 printf("BIOS Geometries:\n"); 281 for (i = 0; i < N_BIOS_GEOM; i++) { 282 unsigned long bios_geom; 283 int max_cylinder, max_head, max_sector; 284 285 bios_geom = bootinfo.bi_bios_geom[i]; 286 287 /* 288 * XXX the bootstrap punts a 1200K floppy geometry 289 * when the get-disk-geometry interrupt fails. Skip 290 * drives that have this geometry. 291 */ 292 if (bios_geom == 0x4f010f) 293 continue; 294 295 printf(" %x:%08lx ", i, bios_geom); 296 max_cylinder = bios_geom >> 16; 297 max_head = (bios_geom >> 8) & 0xff; 298 max_sector = bios_geom & 0xff; 299 printf( 300 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 301 max_cylinder, max_cylinder + 1, 302 max_head, max_head + 1, 303 max_sector, max_sector); 304 } 305 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 306 307 printf("Device configuration finished.\n"); 308 } 309 cold = 0; 310 } 311 312 313 void 314 cpu_rootconf() 315 { 316 /* 317 * XXX NetBSD has a much cleaner approach to finding root. 318 * XXX We should adopt their code. 319 */ 320 #if defined(CD9660) || defined(CD9660_ROOT) 321 if ((boothowto & RB_CDROM)) { 322 if (bootverbose) 323 printf("Considering CD-ROM root f/s.\n"); 324 /* NB: find_cdrom_root() sets rootdev if successful. */ 325 if (find_cdrom_root() == 0) 326 mountrootfsname = "cd9660"; 327 else if (bootverbose) 328 printf("No CD-ROM available as root f/s.\n"); 329 } 330 #endif 331 332 #ifdef MFS_ROOT 333 if (!mountrootfsname) { 334 if (bootverbose) 335 printf("Considering MFS root f/s.\n"); 336 if (mfs_getimage()) { 337 mountrootfsname = "mfs"; 338 /* 339 * Ignore the -a flag if this kernel isn't compiled 340 * with a generic root/swap configuration: if we skip 341 * setroot() and we aren't a generic kernel, chaos 342 * will ensue because setconf() will be a no-op. 343 * (rootdev is always initialized to NODEV in a 344 * generic configuration, so we test for that.) 345 */ 346 if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV) 347 setroot(); 348 } else if (bootverbose) 349 printf("No MFS image available as root f/s.\n"); 350 } 351 #endif 352 353 #ifdef BOOTP_NFSROOT 354 if (!mountrootfsname && !nfs_diskless_valid) { 355 if (bootverbose) 356 printf("Considering BOOTP NFS root f/s.\n"); 357 mountrootfsname = "nfs"; 358 } 359 #endif /* BOOTP_NFSROOT */ 360 #if defined(NFS) || defined(NFS_ROOT) 361 if (!mountrootfsname && nfs_diskless_valid) { 362 if (bootverbose) 363 printf("Considering NFS root f/s.\n"); 364 mountrootfsname = "nfs"; 365 } 366 #endif /* NFS */ 367 368 #if defined(FFS) || defined(FFS_ROOT) 369 if (!mountrootfsname) { 370 mountrootfsname = "ufs"; 371 if (bootverbose) 372 printf("Considering FFS root f/s.\n"); 373 /* 374 * Ignore the -a flag if this kernel isn't compiled 375 * with a generic root/swap configuration: if we skip 376 * setroot() and we aren't a generic kernel, chaos 377 * will ensue because setconf() will be a no-op. 378 * (rootdev is always initialized to NODEV in a 379 * generic configuration, so we test for that.) 380 */ 381 if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV) 382 setroot(); 383 } 384 #endif 385 386 if (!mountrootfsname) { 387 panic("Nobody wants to mount my root for me"); 388 } 389 390 setconf(); 391 } 392 393 394 void 395 cpu_dumpconf() 396 { 397 if (setdumpdev(dumpdev) != 0) 398 dumpdev = NODEV; 399 } 400 401 static int 402 setdumpdev(dev) 403 dev_t dev; 404 { 405 int maj, psize; 406 long newdumplo; 407 408 if (dev == NODEV) { 409 dumpdev = dev; 410 return (0); 411 } 412 maj = major(dev); 413 if (maj >= nblkdev || bdevsw[maj] == NULL) 414 return (ENXIO); /* XXX is this right? */ 415 if (bdevsw[maj]->d_psize == NULL) 416 return (ENXIO); /* XXX should be ENODEV ? */ 417 psize = bdevsw[maj]->d_psize(dev); 418 if (psize == -1) 419 return (ENXIO); /* XXX should be ENODEV ? */ 420 /* 421 * XXX should clean up checking in dumpsys() to be more like this, 422 * and nuke dodump sysctl (too many knobs), and move this to 423 * kern_shutdown.c... 424 */ 425 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE; 426 if (newdumplo < 0) 427 return (ENOSPC); 428 dumpdev = dev; 429 dumplo = newdumplo; 430 return (0); 431 } 432 433 434 u_long bootdev = 0; /* not a dev_t - encoding is different */ 435 436 #define FDMAJOR 2 437 #define FDUNITSHIFT 6 438 439 /* 440 * Attempt to find the device from which we were booted. 441 * If we can do so, and not instructed not to do so, 442 * set rootdevs[] and rootdevnames[] to correspond to the 443 * boot device(s). 444 */ 445 static void 446 setroot() 447 { 448 int majdev, mindev, unit, slice, part; 449 dev_t newrootdev; 450 char partname[2]; 451 char *sname; 452 453 if (boothowto & RB_DFLTROOT || (bootdev & B_MAGICMASK) != B_DEVMAGIC) 454 return; 455 majdev = B_TYPE(bootdev); 456 if (majdev >= nblkdev || bdevsw[majdev] == NULL) 457 return; 458 unit = B_UNIT(bootdev); 459 slice = B_SLICE(bootdev); 460 if (slice == WHOLE_DISK_SLICE) 461 slice = COMPATIBILITY_SLICE; 462 if (slice < 0 || slice >= MAX_SLICES) 463 return; 464 465 /* 466 * XXX kludge for inconsistent unit numbering and lack of slice 467 * support for floppies. 468 */ 469 if (majdev == FDMAJOR) { 470 slice = COMPATIBILITY_SLICE; 471 part = RAW_PART; 472 mindev = unit << FDUNITSHIFT; 473 } else { 474 part = B_PARTITION(bootdev); 475 mindev = dkmakeminor(unit, slice, part); 476 } 477 478 newrootdev = makedev(majdev, mindev); 479 rootdevs[0] = newrootdev; 480 sname = dsname(bdevsw[majdev]->d_name, unit, slice, part, partname); 481 rootdevnames[0] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT); 482 sprintf(rootdevnames[0], "%s%s", sname, partname); 483 484 /* 485 * For properly dangerously dedicated disks (ones with a historical 486 * bogus partition table), the boot blocks will give slice = 4, but 487 * the kernel will only provide the compatibility slice since it 488 * knows that slice 4 is not a real slice. Arrange to try mounting 489 * the compatibility slice as root if mounting the slice passed by 490 * the boot blocks fails. This handles the dangerously dedicated 491 * case and perhaps others. 492 */ 493 if (slice == COMPATIBILITY_SLICE) 494 return; 495 slice = COMPATIBILITY_SLICE; 496 rootdevs[1] = dkmodslice(newrootdev, slice); 497 sname = dsname(bdevsw[majdev]->d_name, unit, slice, part, partname); 498 rootdevnames[1] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT); 499 sprintf(rootdevnames[1], "%s%s", sname, partname); 500 } 501 502 503 static int 504 sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS 505 { 506 int error; 507 dev_t ndumpdev; 508 509 ndumpdev = dumpdev; 510 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 511 if (error == 0 && req->newptr != NULL) 512 error = setdumpdev(ndumpdev); 513 return (error); 514 } 515 516 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 517 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
Cache object: 87d4c03b94a8a111e673511d7e0bcf5f
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