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_nfs.h" 52 #include "opt_nfsroot.h" 53 #include "opt_bus.h" 54 #include "opt_rootdevname.h" 55 56 #include "isa.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/bus.h> 61 #include <sys/conf.h> 62 #include <sys/disklabel.h> 63 #include <sys/diskslice.h> 64 #include <sys/reboot.h> 65 #include <sys/kernel.h> 66 #include <sys/malloc.h> 67 #include <sys/mount.h> 68 #include <sys/cons.h> 69 70 #include <machine/bootinfo.h> 71 #include <machine/ipl.h> 72 #include <machine/md_var.h> 73 #ifdef APIC_IO 74 #include <machine/smp.h> 75 #else 76 #include <i386/isa/icu.h> 77 #endif /* APIC_IO */ 78 79 #if NISA > 0 80 #include <isa/isavar.h> 81 82 device_t isa_bus_device = 0; 83 #endif 84 85 static void configure_first __P((void *)); 86 static void configure __P((void *)); 87 static void configure_final __P((void *)); 88 89 #if defined(FFS) && defined(FFS_ROOT) 90 static void setroot __P((void)); 91 #endif 92 93 #if defined(NFS) && defined(NFS_ROOT) 94 static void pxe_setup_nfsdiskless(void); 95 #endif 96 97 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL); 98 /* SI_ORDER_SECOND is hookable */ 99 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL); 100 /* SI_ORDER_MIDDLE is hookable */ 101 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL); 102 103 dev_t rootdev = NODEV; 104 dev_t dumpdev = NODEV; 105 106 device_t nexus_dev; 107 108 /* 109 * Determine i/o configuration for a machine. 110 */ 111 static void 112 configure_first(dummy) 113 void *dummy; 114 { 115 } 116 117 static void 118 configure(dummy) 119 void *dummy; 120 { 121 122 /* 123 * Activate the ICU's. Note that we are explicitly at splhigh() 124 * at present as we have no way to disable stray PCI level triggered 125 * interrupts until the devices have had a driver attached. This 126 * is particularly a problem when the interrupts are shared. For 127 * example, if IRQ 10 is shared between a disk and network device 128 * and the disk device generates an interrupt, if we "activate" 129 * IRQ 10 when the network driver is set up, then we will get 130 * recursive interrupt 10's as nothing will know how to turn off 131 * the disk device's interrupt. 132 * 133 * Having the ICU's active means we can probe interrupt routing to 134 * see if a device causes the corresponding pending bit to be set. 135 * 136 * This is all rather inconvenient. 137 */ 138 #ifdef APIC_IO 139 bsp_apic_configure(); 140 enable_intr(); 141 #else 142 enable_intr(); 143 INTREN(IRQ_SLAVE); 144 #endif /* APIC_IO */ 145 146 /* nexus0 is the top of the i386 device tree */ 147 device_add_child(root_bus, "nexus", 0); 148 149 /* initialize new bus architecture */ 150 root_bus_configure(); 151 152 #if NISA > 0 153 /* 154 * Explicitly probe and attach ISA last. The isa bus saves 155 * it's device node at attach time for us here. 156 */ 157 if (isa_bus_device) 158 isa_probe_children(isa_bus_device); 159 #endif 160 161 /* 162 * Now we're ready to handle (pending) interrupts. 163 * XXX this is slightly misplaced. 164 */ 165 spl0(); 166 167 /* 168 * Allow lowering of the ipl to the lowest kernel level if we 169 * panic (or call tsleep() before clearing `cold'). No level is 170 * completely safe (since a panic may occur in a critical region 171 * at splhigh()), but we want at least bio interrupts to work. 172 */ 173 safepri = cpl; 174 } 175 176 static void 177 configure_final(dummy) 178 void *dummy; 179 { 180 int i; 181 182 cninit_finish(); 183 184 if (bootverbose) { 185 186 #ifdef APIC_IO 187 imen_dump(); 188 #endif /* APIC_IO */ 189 190 /* 191 * Print out the BIOS's idea of the disk geometries. 192 */ 193 printf("BIOS Geometries:\n"); 194 for (i = 0; i < N_BIOS_GEOM; i++) { 195 unsigned long bios_geom; 196 int max_cylinder, max_head, max_sector; 197 198 bios_geom = bootinfo.bi_bios_geom[i]; 199 200 /* 201 * XXX the bootstrap punts a 1200K floppy geometry 202 * when the get-disk-geometry interrupt fails. Skip 203 * drives that have this geometry. 204 */ 205 if (bios_geom == 0x4f010f) 206 continue; 207 208 printf(" %x:%08lx ", i, bios_geom); 209 max_cylinder = bios_geom >> 16; 210 max_head = (bios_geom >> 8) & 0xff; 211 max_sector = bios_geom & 0xff; 212 printf( 213 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 214 max_cylinder, max_cylinder + 1, 215 max_head, max_head + 1, 216 max_sector, max_sector); 217 } 218 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 219 220 printf("Device configuration finished.\n"); 221 } 222 cold = 0; 223 } 224 225 #ifdef BOOTP 226 extern void bootpc_init(void); 227 #endif 228 /* 229 * Do legacy root filesystem discovery. 230 */ 231 void 232 cpu_rootconf() 233 { 234 #ifdef BOOTP 235 bootpc_init(); 236 #endif 237 #if defined(NFS) && defined(NFS_ROOT) 238 #if !defined(BOOTP_NFSROOT) 239 pxe_setup_nfsdiskless(); 240 if (nfs_diskless_valid) 241 #endif 242 rootdevnames[0] = "nfs:"; 243 #endif 244 #if defined(FFS) && defined(FFS_ROOT) 245 if (!rootdevnames[0]) 246 setroot(); 247 #endif 248 } 249 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL) 250 251 u_long bootdev = 0; /* not a dev_t - encoding is different */ 252 253 #if defined(FFS) && defined(FFS_ROOT) 254 #define FDMAJOR 2 255 #define FDUNITSHIFT 6 256 257 /* 258 * Attempt to find the device from which we were booted. 259 * If we can do so, and not instructed not to do so, 260 * set rootdevs[] and rootdevnames[] to correspond to the 261 * boot device(s). 262 * 263 * This code survives in order to allow the system to be 264 * booted from legacy environments that do not correctly 265 * populate the kernel environment. There are significant 266 * restrictions on the bootability of the system in this 267 * situation; it can only be mounting root from a 'da' 268 * 'wd' or 'fd' device, and the root filesystem must be ufs. 269 */ 270 static void 271 setroot() 272 { 273 int majdev, mindev, unit, slice, part; 274 dev_t newrootdev, dev; 275 char partname[2]; 276 char *sname; 277 278 if ((bootdev & B_MAGICMASK) != B_DEVMAGIC) { 279 printf("no B_DEVMAGIC (bootdev=%#lx)\n", bootdev); 280 return; 281 } 282 majdev = B_TYPE(bootdev); 283 dev = makebdev(majdev, 0); 284 if (devsw(dev) == NULL) 285 return; 286 unit = B_UNIT(bootdev); 287 slice = B_SLICE(bootdev); 288 if (slice == WHOLE_DISK_SLICE) 289 slice = COMPATIBILITY_SLICE; 290 if (slice < 0 || slice >= MAX_SLICES) { 291 printf("bad slice\n"); 292 return; 293 } 294 295 /* 296 * XXX kludge for inconsistent unit numbering and lack of slice 297 * support for floppies. 298 */ 299 if (majdev == FDMAJOR) { 300 slice = COMPATIBILITY_SLICE; 301 part = RAW_PART; 302 mindev = unit << FDUNITSHIFT; 303 } else { 304 part = B_PARTITION(bootdev); 305 mindev = dkmakeminor(unit, slice, part); 306 } 307 308 newrootdev = makebdev(majdev, mindev); 309 sname = dsname(newrootdev, unit, slice, part, partname); 310 rootdevnames[0] = malloc(strlen(sname) + 6, M_DEVBUF, M_NOWAIT); 311 sprintf(rootdevnames[0], "ufs:%s%s", sname, partname); 312 313 /* 314 * For properly dangerously dedicated disks (ones with a historical 315 * bogus partition table), the boot blocks will give slice = 4, but 316 * the kernel will only provide the compatibility slice since it 317 * knows that slice 4 is not a real slice. Arrange to try mounting 318 * the compatibility slice as root if mounting the slice passed by 319 * the boot blocks fails. This handles the dangerously dedicated 320 * case and perhaps others. 321 */ 322 if (slice == COMPATIBILITY_SLICE) 323 return; 324 slice = COMPATIBILITY_SLICE; 325 sname = dsname(newrootdev, unit, slice, part, partname); 326 rootdevnames[1] = malloc(strlen(sname) + 6, M_DEVBUF, M_NOWAIT); 327 sprintf(rootdevnames[1], "ufs:%s%s", sname, partname); 328 } 329 #endif 330 331 #if defined(NFS) && defined(NFS_ROOT) 332 333 #include <sys/socket.h> 334 #include <net/if.h> 335 #include <net/if_dl.h> 336 #include <net/if_types.h> 337 #include <net/if_var.h> 338 #include <net/ethernet.h> 339 #include <netinet/in.h> 340 #include <nfs/rpcv2.h> 341 #include <nfs/nfsproto.h> 342 #include <nfs/nfs.h> 343 #include <nfs/nfsdiskless.h> 344 345 extern struct nfs_diskless nfs_diskless; 346 347 static int 348 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 349 { 350 u_int32_t a[4]; 351 char *cp; 352 353 bzero(sa, sizeof(*sa)); 354 sa->sin_len = sizeof(*sa); 355 sa->sin_family = AF_INET; 356 357 if ((cp = getenv(ev)) == NULL) 358 return(1); 359 if (sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]) != 4) 360 return(1); 361 /* XXX is this ordering correct? */ 362 sa->sin_addr.s_addr = (a[3] << 24) + (a[2] << 16) + (a[1] << 8) + a[0]; 363 return(0); 364 } 365 366 static int 367 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 368 { 369 char *cp; 370 u_int32_t a[6]; 371 372 bzero(sa, sizeof(*sa)); 373 sa->sdl_len = sizeof(*sa); 374 sa->sdl_family = AF_LINK; 375 sa->sdl_type = IFT_ETHER; 376 sa->sdl_alen = ETHER_ADDR_LEN; 377 if ((cp = getenv(ev)) == NULL) 378 return(1); 379 if (sscanf(cp, "%x:%x:%x:%x:%x:%x", &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]) != 6) 380 return(1); 381 sa->sdl_data[0] = a[0]; 382 sa->sdl_data[1] = a[1]; 383 sa->sdl_data[2] = a[2]; 384 sa->sdl_data[3] = a[3]; 385 sa->sdl_data[4] = a[4]; 386 sa->sdl_data[5] = a[5]; 387 return(0); 388 } 389 390 static int 391 decode_nfshandle(char *ev, u_char *fh) 392 { 393 u_char *cp; 394 int len, val; 395 396 if (((cp = getenv(ev)) == NULL) || (strlen(cp) < 2) || (*cp != 'X')) 397 return(0); 398 len = 0; 399 cp++; 400 for (;;) { 401 if (*cp == 'X') 402 return(len); 403 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) 404 return(0); 405 *(fh++) = val; 406 len++; 407 cp += 2; 408 if (len > NFSX_V2FH) 409 return(0); 410 } 411 } 412 413 /* 414 * Populate the essential fields in the nfsv3_diskless structure. 415 * 416 * The loader is expected to export the following environment variables: 417 * 418 * boot.netif.ip IP address on boot interface 419 * boot.netif.netmask netmask on boot interface 420 * boot.netif.gateway default gateway (optional) 421 * boot.netif.hwaddr hardware address of boot interface 422 * boot.nfsroot.server IP address of root filesystem server 423 * boot.nfsroot.path path of the root filesystem on server 424 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 425 */ 426 static void 427 pxe_setup_nfsdiskless() 428 { 429 struct nfs_diskless *nd = &nfs_diskless; 430 struct ifnet *ifp; 431 struct ifaddr *ifa; 432 struct sockaddr_dl *sdl, ourdl; 433 struct sockaddr_in myaddr, netmask; 434 char *cp; 435 436 /* set up interface */ 437 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 438 return; 439 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 440 printf("PXE: no netmask\n"); 441 return; 442 } 443 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 444 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 445 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 446 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 447 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 448 449 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 450 printf("PXE: no hardware address\n"); 451 return; 452 } 453 ifa = NULL; 454 ifp = TAILQ_FIRST(&ifnet); 455 TAILQ_FOREACH(ifp, &ifnet, if_link) { 456 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 457 if ((ifa->ifa_addr->sa_family == AF_LINK) && 458 (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) { 459 if ((sdl->sdl_type == ourdl.sdl_type) && 460 (sdl->sdl_alen == ourdl.sdl_alen) && 461 !bcmp(sdl->sdl_data + sdl->sdl_nlen, 462 ourdl.sdl_data + ourdl.sdl_nlen, 463 sdl->sdl_alen)) 464 goto match_done; 465 } 466 } 467 } 468 printf("PXE: no interface\n"); 469 return; /* no matching interface */ 470 match_done: 471 sprintf(nd->myif.ifra_name, "%s%d", ifp->if_name, ifp->if_unit); 472 473 474 /* set up gateway */ 475 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 476 477 /* XXX set up swap? */ 478 479 /* set up root mount */ 480 nd->root_args.rsize = 8192; /* XXX tunable? */ 481 nd->root_args.wsize = 8192; 482 nd->root_args.sotype = SOCK_DGRAM; 483 nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT); 484 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) { 485 printf("PXE: no server\n"); 486 return; 487 } 488 nd->root_saddr.sin_port = htons(NFS_PORT); 489 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) { 490 printf("PXE: no NFS handle\n"); 491 return; 492 } 493 if ((cp = getenv("boot.nfsroot.path")) != NULL) 494 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 495 496 nfs_diskless_valid = 1; 497 } 498 #endif
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