Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1995 Terrence R. Lambert 3 * All rights reserved. 4 * 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 42 */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD: releng/8.0/sys/kern/init_main.c 198434 2009-10-24 04:55:14Z ru $"); 46 47 #include "opt_ddb.h" 48 #include "opt_init_path.h" 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/exec.h> 53 #include <sys/file.h> 54 #include <sys/filedesc.h> 55 #include <sys/jail.h> 56 #include <sys/ktr.h> 57 #include <sys/lock.h> 58 #include <sys/mount.h> 59 #include <sys/mutex.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/proc.h> 63 #include <sys/resourcevar.h> 64 #include <sys/systm.h> 65 #include <sys/signalvar.h> 66 #include <sys/vnode.h> 67 #include <sys/sysent.h> 68 #include <sys/reboot.h> 69 #include <sys/sched.h> 70 #include <sys/sx.h> 71 #include <sys/sysproto.h> 72 #include <sys/vmmeter.h> 73 #include <sys/unistd.h> 74 #include <sys/malloc.h> 75 #include <sys/conf.h> 76 #include <sys/cpuset.h> 77 78 #include <machine/cpu.h> 79 80 #include <security/audit/audit.h> 81 #include <security/mac/mac_framework.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_param.h> 85 #include <vm/pmap.h> 86 #include <vm/vm_map.h> 87 #include <sys/copyright.h> 88 89 #include <ddb/ddb.h> 90 #include <ddb/db_sym.h> 91 92 void mi_startup(void); /* Should be elsewhere */ 93 94 /* Components of the first process -- never freed. */ 95 static struct session session0; 96 static struct pgrp pgrp0; 97 struct proc proc0; 98 struct thread thread0 __aligned(16); 99 struct vmspace vmspace0; 100 struct proc *initproc; 101 102 int boothowto = 0; /* initialized so that it can be patched */ 103 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 104 int bootverbose; 105 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, ""); 106 107 /* 108 * This ensures that there is at least one entry so that the sysinit_set 109 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 110 * executed. 111 */ 112 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 113 114 /* 115 * The sysinit table itself. Items are checked off as the are run. 116 * If we want to register new sysinit types, add them to newsysinit. 117 */ 118 SET_DECLARE(sysinit_set, struct sysinit); 119 struct sysinit **sysinit, **sysinit_end; 120 struct sysinit **newsysinit, **newsysinit_end; 121 122 /* 123 * Merge a new sysinit set into the current set, reallocating it if 124 * necessary. This can only be called after malloc is running. 125 */ 126 void 127 sysinit_add(struct sysinit **set, struct sysinit **set_end) 128 { 129 struct sysinit **newset; 130 struct sysinit **sipp; 131 struct sysinit **xipp; 132 int count; 133 134 count = set_end - set; 135 if (newsysinit) 136 count += newsysinit_end - newsysinit; 137 else 138 count += sysinit_end - sysinit; 139 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 140 if (newset == NULL) 141 panic("cannot malloc for sysinit"); 142 xipp = newset; 143 if (newsysinit) 144 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 145 *xipp++ = *sipp; 146 else 147 for (sipp = sysinit; sipp < sysinit_end; sipp++) 148 *xipp++ = *sipp; 149 for (sipp = set; sipp < set_end; sipp++) 150 *xipp++ = *sipp; 151 if (newsysinit) 152 free(newsysinit, M_TEMP); 153 newsysinit = newset; 154 newsysinit_end = newset + count; 155 } 156 157 /* 158 * System startup; initialize the world, create process 0, mount root 159 * filesystem, and fork to create init and pagedaemon. Most of the 160 * hard work is done in the lower-level initialization routines including 161 * startup(), which does memory initialization and autoconfiguration. 162 * 163 * This allows simple addition of new kernel subsystems that require 164 * boot time initialization. It also allows substitution of subsystem 165 * (for instance, a scheduler, kernel profiler, or VM system) by object 166 * module. Finally, it allows for optional "kernel threads". 167 */ 168 void 169 mi_startup(void) 170 { 171 172 register struct sysinit **sipp; /* system initialization*/ 173 register struct sysinit **xipp; /* interior loop of sort*/ 174 register struct sysinit *save; /* bubble*/ 175 176 #if defined(VERBOSE_SYSINIT) 177 int last; 178 int verbose; 179 #endif 180 181 if (sysinit == NULL) { 182 sysinit = SET_BEGIN(sysinit_set); 183 sysinit_end = SET_LIMIT(sysinit_set); 184 } 185 186 restart: 187 /* 188 * Perform a bubble sort of the system initialization objects by 189 * their subsystem (primary key) and order (secondary key). 190 */ 191 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 192 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 193 if ((*sipp)->subsystem < (*xipp)->subsystem || 194 ((*sipp)->subsystem == (*xipp)->subsystem && 195 (*sipp)->order <= (*xipp)->order)) 196 continue; /* skip*/ 197 save = *sipp; 198 *sipp = *xipp; 199 *xipp = save; 200 } 201 } 202 203 #if defined(VERBOSE_SYSINIT) 204 last = SI_SUB_COPYRIGHT; 205 verbose = 0; 206 #if !defined(DDB) 207 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 208 #endif 209 #endif 210 211 /* 212 * Traverse the (now) ordered list of system initialization tasks. 213 * Perform each task, and continue on to the next task. 214 * 215 * The last item on the list is expected to be the scheduler, 216 * which will not return. 217 */ 218 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 219 220 if ((*sipp)->subsystem == SI_SUB_DUMMY) 221 continue; /* skip dummy task(s)*/ 222 223 if ((*sipp)->subsystem == SI_SUB_DONE) 224 continue; 225 226 #if defined(VERBOSE_SYSINIT) 227 if ((*sipp)->subsystem > last) { 228 verbose = 1; 229 last = (*sipp)->subsystem; 230 printf("subsystem %x\n", last); 231 } 232 if (verbose) { 233 #if defined(DDB) 234 const char *name; 235 c_db_sym_t sym; 236 db_expr_t offset; 237 238 sym = db_search_symbol((vm_offset_t)(*sipp)->func, 239 DB_STGY_PROC, &offset); 240 db_symbol_values(sym, &name, NULL); 241 if (name != NULL) 242 printf(" %s(%p)... ", name, (*sipp)->udata); 243 else 244 #endif 245 printf(" %p(%p)... ", (*sipp)->func, 246 (*sipp)->udata); 247 } 248 #endif 249 250 /* Call function */ 251 (*((*sipp)->func))((*sipp)->udata); 252 253 #if defined(VERBOSE_SYSINIT) 254 if (verbose) 255 printf("done.\n"); 256 #endif 257 258 /* Check off the one we're just done */ 259 (*sipp)->subsystem = SI_SUB_DONE; 260 261 /* Check if we've installed more sysinit items via KLD */ 262 if (newsysinit != NULL) { 263 if (sysinit != SET_BEGIN(sysinit_set)) 264 free(sysinit, M_TEMP); 265 sysinit = newsysinit; 266 sysinit_end = newsysinit_end; 267 newsysinit = NULL; 268 newsysinit_end = NULL; 269 goto restart; 270 } 271 } 272 273 panic("Shouldn't get here!"); 274 /* NOTREACHED*/ 275 } 276 277 278 /* 279 *************************************************************************** 280 **** 281 **** The following SYSINIT's belong elsewhere, but have not yet 282 **** been moved. 283 **** 284 *************************************************************************** 285 */ 286 static void 287 print_caddr_t(void *data __unused) 288 { 289 printf("%s", (char *)data); 290 } 291 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 292 copyright); 293 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 294 trademark); 295 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_caddr_t, version); 296 297 #ifdef WITNESS 298 static char wit_warn[] = 299 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 300 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 301 print_caddr_t, wit_warn); 302 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 303 print_caddr_t, wit_warn); 304 #endif 305 306 #ifdef DIAGNOSTIC 307 static char diag_warn[] = 308 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 309 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 310 print_caddr_t, diag_warn); 311 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 312 print_caddr_t, diag_warn); 313 #endif 314 315 static void 316 set_boot_verbose(void *data __unused) 317 { 318 319 if (boothowto & RB_VERBOSE) 320 bootverbose++; 321 } 322 SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL); 323 324 struct sysentvec null_sysvec = { 325 .sv_size = 0, 326 .sv_table = NULL, 327 .sv_mask = 0, 328 .sv_sigsize = 0, 329 .sv_sigtbl = NULL, 330 .sv_errsize = 0, 331 .sv_errtbl = NULL, 332 .sv_transtrap = NULL, 333 .sv_fixup = NULL, 334 .sv_sendsig = NULL, 335 .sv_sigcode = NULL, 336 .sv_szsigcode = NULL, 337 .sv_prepsyscall = NULL, 338 .sv_name = "null", 339 .sv_coredump = NULL, 340 .sv_imgact_try = NULL, 341 .sv_minsigstksz = 0, 342 .sv_pagesize = PAGE_SIZE, 343 .sv_minuser = VM_MIN_ADDRESS, 344 .sv_maxuser = VM_MAXUSER_ADDRESS, 345 .sv_usrstack = USRSTACK, 346 .sv_psstrings = PS_STRINGS, 347 .sv_stackprot = VM_PROT_ALL, 348 .sv_copyout_strings = NULL, 349 .sv_setregs = NULL, 350 .sv_fixlimit = NULL, 351 .sv_maxssiz = NULL 352 }; 353 354 /* 355 *************************************************************************** 356 **** 357 **** The two following SYSINIT's are proc0 specific glue code. I am not 358 **** convinced that they can not be safely combined, but their order of 359 **** operation has been maintained as the same as the original init_main.c 360 **** for right now. 361 **** 362 **** These probably belong in init_proc.c or kern_proc.c, since they 363 **** deal with proc0 (the fork template process). 364 **** 365 *************************************************************************** 366 */ 367 /* ARGSUSED*/ 368 static void 369 proc0_init(void *dummy __unused) 370 { 371 struct proc *p; 372 unsigned i; 373 struct thread *td; 374 375 GIANT_REQUIRED; 376 p = &proc0; 377 td = &thread0; 378 379 /* 380 * Initialize magic number and osrel. 381 */ 382 p->p_magic = P_MAGIC; 383 p->p_osrel = osreldate; 384 385 /* 386 * Initialize thread and process structures. 387 */ 388 procinit(); /* set up proc zone */ 389 threadinit(); /* set up UMA zones */ 390 391 /* 392 * Initialise scheduler resources. 393 * Add scheduler specific parts to proc, thread as needed. 394 */ 395 schedinit(); /* scheduler gets its house in order */ 396 /* 397 * Initialize sleep queue hash table 398 */ 399 sleepinit(); 400 401 /* 402 * additional VM structures 403 */ 404 vm_init2(); 405 406 /* 407 * Create process 0 (the swapper). 408 */ 409 LIST_INSERT_HEAD(&allproc, p, p_list); 410 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 411 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 412 p->p_pgrp = &pgrp0; 413 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 414 LIST_INIT(&pgrp0.pg_members); 415 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 416 417 pgrp0.pg_session = &session0; 418 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 419 refcount_init(&session0.s_count, 1); 420 session0.s_leader = p; 421 422 p->p_sysent = &null_sysvec; 423 p->p_flag = P_SYSTEM | P_INMEM; 424 p->p_state = PRS_NORMAL; 425 knlist_init_mtx(&p->p_klist, &p->p_mtx); 426 STAILQ_INIT(&p->p_ktr); 427 p->p_nice = NZERO; 428 td->td_tid = PID_MAX + 1; 429 td->td_state = TDS_RUNNING; 430 td->td_pri_class = PRI_TIMESHARE; 431 td->td_user_pri = PUSER; 432 td->td_base_user_pri = PUSER; 433 td->td_priority = PVM; 434 td->td_base_pri = PUSER; 435 td->td_oncpu = 0; 436 td->td_flags = TDF_INMEM|TDP_KTHREAD; 437 td->td_cpuset = cpuset_thread0(); 438 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 439 p->p_peers = 0; 440 p->p_leader = p; 441 442 443 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 444 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 445 446 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 447 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 448 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 449 450 /* Create credentials. */ 451 p->p_ucred = crget(); 452 p->p_ucred->cr_ngroups = 1; /* group 0 */ 453 p->p_ucred->cr_uidinfo = uifind(0); 454 p->p_ucred->cr_ruidinfo = uifind(0); 455 p->p_ucred->cr_prison = &prison0; 456 #ifdef AUDIT 457 audit_cred_kproc0(p->p_ucred); 458 #endif 459 #ifdef MAC 460 mac_cred_create_swapper(p->p_ucred); 461 #endif 462 td->td_ucred = crhold(p->p_ucred); 463 464 /* Create sigacts. */ 465 p->p_sigacts = sigacts_alloc(); 466 467 /* Initialize signal state for process 0. */ 468 siginit(&proc0); 469 470 /* Create the file descriptor table. */ 471 p->p_fd = fdinit(NULL); 472 p->p_fdtol = NULL; 473 474 /* Create the limits structures. */ 475 p->p_limit = lim_alloc(); 476 for (i = 0; i < RLIM_NLIMITS; i++) 477 p->p_limit->pl_rlimit[i].rlim_cur = 478 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 479 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 480 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 481 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 482 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 483 i = ptoa(cnt.v_free_count); 484 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i; 485 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 486 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 487 p->p_cpulimit = RLIM_INFINITY; 488 489 p->p_stats = pstats_alloc(); 490 491 /* Allocate a prototype map so we have something to fork. */ 492 pmap_pinit0(vmspace_pmap(&vmspace0)); 493 p->p_vmspace = &vmspace0; 494 vmspace0.vm_refcnt = 1; 495 496 /* 497 * proc0 is not expected to enter usermode, so there is no special 498 * handling for sv_minuser here, like is done for exec_new_vmspace(). 499 */ 500 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 501 p->p_sysent->sv_maxuser); 502 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 503 504 /*- 505 * call the init and ctor for the new thread and proc 506 * we wait to do this until all other structures 507 * are fairly sane. 508 */ 509 EVENTHANDLER_INVOKE(process_init, p); 510 EVENTHANDLER_INVOKE(thread_init, td); 511 EVENTHANDLER_INVOKE(process_ctor, p); 512 EVENTHANDLER_INVOKE(thread_ctor, td); 513 514 /* 515 * Charge root for one process. 516 */ 517 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 518 } 519 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 520 521 /* ARGSUSED*/ 522 static void 523 proc0_post(void *dummy __unused) 524 { 525 struct timespec ts; 526 struct proc *p; 527 struct rusage ru; 528 struct thread *td; 529 530 /* 531 * Now we can look at the time, having had a chance to verify the 532 * time from the filesystem. Pretend that proc0 started now. 533 */ 534 sx_slock(&allproc_lock); 535 FOREACH_PROC_IN_SYSTEM(p) { 536 microuptime(&p->p_stats->p_start); 537 PROC_SLOCK(p); 538 rufetch(p, &ru); /* Clears thread stats */ 539 PROC_SUNLOCK(p); 540 p->p_rux.rux_runtime = 0; 541 p->p_rux.rux_uticks = 0; 542 p->p_rux.rux_sticks = 0; 543 p->p_rux.rux_iticks = 0; 544 FOREACH_THREAD_IN_PROC(p, td) { 545 td->td_runtime = 0; 546 } 547 } 548 sx_sunlock(&allproc_lock); 549 PCPU_SET(switchtime, cpu_ticks()); 550 PCPU_SET(switchticks, ticks); 551 552 /* 553 * Give the ``random'' number generator a thump. 554 */ 555 nanotime(&ts); 556 srandom(ts.tv_sec ^ ts.tv_nsec); 557 } 558 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 559 560 static void 561 random_init(void *dummy __unused) 562 { 563 564 /* 565 * After CPU has been started we have some randomness on most 566 * platforms via get_cyclecount(). For platforms that don't 567 * we will reseed random(9) in proc0_post() as well. 568 */ 569 srandom(get_cyclecount()); 570 } 571 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 572 573 /* 574 *************************************************************************** 575 **** 576 **** The following SYSINIT's and glue code should be moved to the 577 **** respective files on a per subsystem basis. 578 **** 579 *************************************************************************** 580 */ 581 582 583 /* 584 *************************************************************************** 585 **** 586 **** The following code probably belongs in another file, like 587 **** kern/init_init.c. 588 **** 589 *************************************************************************** 590 */ 591 592 /* 593 * List of paths to try when searching for "init". 594 */ 595 static char init_path[MAXPATHLEN] = 596 #ifdef INIT_PATH 597 __XSTRING(INIT_PATH); 598 #else 599 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 600 #endif 601 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 602 "Path used to search the init process"); 603 604 /* 605 * Shutdown timeout of init(8). 606 * Unused within kernel, but used to control init(8), hence do not remove. 607 */ 608 #ifndef INIT_SHUTDOWN_TIMEOUT 609 #define INIT_SHUTDOWN_TIMEOUT 120 610 #endif 611 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 612 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 613 CTLFLAG_RW, &init_shutdown_timeout, 0, ""); 614 615 /* 616 * Start the initial user process; try exec'ing each pathname in init_path. 617 * The program is invoked with one argument containing the boot flags. 618 */ 619 static void 620 start_init(void *dummy) 621 { 622 vm_offset_t addr; 623 struct execve_args args; 624 int options, error; 625 char *var, *path, *next, *s; 626 char *ucp, **uap, *arg0, *arg1; 627 struct thread *td; 628 struct proc *p; 629 630 mtx_lock(&Giant); 631 632 GIANT_REQUIRED; 633 634 td = curthread; 635 p = td->td_proc; 636 637 vfs_mountroot(); 638 639 /* 640 * Need just enough stack to hold the faked-up "execve()" arguments. 641 */ 642 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 643 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 644 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 645 panic("init: couldn't allocate argument space"); 646 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 647 p->p_vmspace->vm_ssize = 1; 648 649 if ((var = getenv("init_path")) != NULL) { 650 strlcpy(init_path, var, sizeof(init_path)); 651 freeenv(var); 652 } 653 654 for (path = init_path; *path != '\0'; path = next) { 655 while (*path == ':') 656 path++; 657 if (*path == '\0') 658 break; 659 for (next = path; *next != '\0' && *next != ':'; next++) 660 /* nothing */ ; 661 if (bootverbose) 662 printf("start_init: trying %.*s\n", (int)(next - path), 663 path); 664 665 /* 666 * Move out the boot flag argument. 667 */ 668 options = 0; 669 ucp = (char *)p->p_sysent->sv_usrstack; 670 (void)subyte(--ucp, 0); /* trailing zero */ 671 if (boothowto & RB_SINGLE) { 672 (void)subyte(--ucp, 's'); 673 options = 1; 674 } 675 #ifdef notyet 676 if (boothowto & RB_FASTBOOT) { 677 (void)subyte(--ucp, 'f'); 678 options = 1; 679 } 680 #endif 681 682 #ifdef BOOTCDROM 683 (void)subyte(--ucp, 'C'); 684 options = 1; 685 #endif 686 687 if (options == 0) 688 (void)subyte(--ucp, '-'); 689 (void)subyte(--ucp, '-'); /* leading hyphen */ 690 arg1 = ucp; 691 692 /* 693 * Move out the file name (also arg 0). 694 */ 695 (void)subyte(--ucp, 0); 696 for (s = next - 1; s >= path; s--) 697 (void)subyte(--ucp, *s); 698 arg0 = ucp; 699 700 /* 701 * Move out the arg pointers. 702 */ 703 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 704 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 705 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 706 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 707 708 /* 709 * Point at the arguments. 710 */ 711 args.fname = arg0; 712 args.argv = uap; 713 args.envv = NULL; 714 715 /* 716 * Now try to exec the program. If can't for any reason 717 * other than it doesn't exist, complain. 718 * 719 * Otherwise, return via fork_trampoline() all the way 720 * to user mode as init! 721 */ 722 if ((error = execve(td, &args)) == 0) { 723 mtx_unlock(&Giant); 724 return; 725 } 726 if (error != ENOENT) 727 printf("exec %.*s: error %d\n", (int)(next - path), 728 path, error); 729 } 730 printf("init: not found in path %s\n", init_path); 731 panic("no init"); 732 } 733 734 /* 735 * Like kproc_create(), but runs in it's own address space. 736 * We do this early to reserve pid 1. 737 * 738 * Note special case - do not make it runnable yet. Other work 739 * in progress will change this more. 740 */ 741 static void 742 create_init(const void *udata __unused) 743 { 744 struct ucred *newcred, *oldcred; 745 int error; 746 747 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 748 if (error) 749 panic("cannot fork init: %d\n", error); 750 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 751 /* divorce init's credentials from the kernel's */ 752 newcred = crget(); 753 PROC_LOCK(initproc); 754 initproc->p_flag |= P_SYSTEM | P_INMEM; 755 oldcred = initproc->p_ucred; 756 crcopy(newcred, oldcred); 757 #ifdef MAC 758 mac_cred_create_init(newcred); 759 #endif 760 #ifdef AUDIT 761 audit_cred_proc1(newcred); 762 #endif 763 initproc->p_ucred = newcred; 764 PROC_UNLOCK(initproc); 765 crfree(oldcred); 766 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 767 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 768 } 769 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 770 771 /* 772 * Make it runnable now. 773 */ 774 static void 775 kick_init(const void *udata __unused) 776 { 777 struct thread *td; 778 779 td = FIRST_THREAD_IN_PROC(initproc); 780 thread_lock(td); 781 TD_SET_CAN_RUN(td); 782 sched_add(td, SRQ_BORING); 783 thread_unlock(td); 784 } 785 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: 3901ef9d4e95e90f622ef2fa743af29b
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]