Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/init_main.c
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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/8.4/sys/kern/init_main.c 247875 2013-03-06 09:16:01Z avg $"); 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 (boothowto & RB_VERBOSE) 182 bootverbose++; 183 184 if (sysinit == NULL) { 185 sysinit = SET_BEGIN(sysinit_set); 186 sysinit_end = SET_LIMIT(sysinit_set); 187 } 188 189 restart: 190 /* 191 * Perform a bubble sort of the system initialization objects by 192 * their subsystem (primary key) and order (secondary key). 193 */ 194 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 195 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 196 if ((*sipp)->subsystem < (*xipp)->subsystem || 197 ((*sipp)->subsystem == (*xipp)->subsystem && 198 (*sipp)->order <= (*xipp)->order)) 199 continue; /* skip*/ 200 save = *sipp; 201 *sipp = *xipp; 202 *xipp = save; 203 } 204 } 205 206 #if defined(VERBOSE_SYSINIT) 207 last = SI_SUB_COPYRIGHT; 208 verbose = 0; 209 #if !defined(DDB) 210 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 211 #endif 212 #endif 213 214 /* 215 * Traverse the (now) ordered list of system initialization tasks. 216 * Perform each task, and continue on to the next task. 217 * 218 * The last item on the list is expected to be the scheduler, 219 * which will not return. 220 */ 221 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 222 223 if ((*sipp)->subsystem == SI_SUB_DUMMY) 224 continue; /* skip dummy task(s)*/ 225 226 if ((*sipp)->subsystem == SI_SUB_DONE) 227 continue; 228 229 #if defined(VERBOSE_SYSINIT) 230 if ((*sipp)->subsystem > last) { 231 verbose = 1; 232 last = (*sipp)->subsystem; 233 printf("subsystem %x\n", last); 234 } 235 if (verbose) { 236 #if defined(DDB) 237 const char *name; 238 c_db_sym_t sym; 239 db_expr_t offset; 240 241 sym = db_search_symbol((vm_offset_t)(*sipp)->func, 242 DB_STGY_PROC, &offset); 243 db_symbol_values(sym, &name, NULL); 244 if (name != NULL) 245 printf(" %s(%p)... ", name, (*sipp)->udata); 246 else 247 #endif 248 printf(" %p(%p)... ", (*sipp)->func, 249 (*sipp)->udata); 250 } 251 #endif 252 253 /* Call function */ 254 (*((*sipp)->func))((*sipp)->udata); 255 256 #if defined(VERBOSE_SYSINIT) 257 if (verbose) 258 printf("done.\n"); 259 #endif 260 261 /* Check off the one we're just done */ 262 (*sipp)->subsystem = SI_SUB_DONE; 263 264 /* Check if we've installed more sysinit items via KLD */ 265 if (newsysinit != NULL) { 266 if (sysinit != SET_BEGIN(sysinit_set)) 267 free(sysinit, M_TEMP); 268 sysinit = newsysinit; 269 sysinit_end = newsysinit_end; 270 newsysinit = NULL; 271 newsysinit_end = NULL; 272 goto restart; 273 } 274 } 275 276 panic("Shouldn't get here!"); 277 /* NOTREACHED*/ 278 } 279 280 281 /* 282 *************************************************************************** 283 **** 284 **** The following SYSINIT's belong elsewhere, but have not yet 285 **** been moved. 286 **** 287 *************************************************************************** 288 */ 289 static void 290 print_caddr_t(void *data) 291 { 292 printf("%s", (char *)data); 293 } 294 295 static void 296 print_version(void *data __unused) 297 { 298 int len; 299 300 /* Strip a trailing newline from version. */ 301 len = strlen(version); 302 while (len > 0 && version[len - 1] == '\n') 303 len--; 304 printf("%.*s %s\n", len, version, machine); 305 printf("%s\n", compiler_version); 306 } 307 308 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 309 copyright); 310 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 311 trademark); 312 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 313 314 #ifdef WITNESS 315 static char wit_warn[] = 316 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 317 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 318 print_caddr_t, wit_warn); 319 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 320 print_caddr_t, wit_warn); 321 #endif 322 323 #ifdef DIAGNOSTIC 324 static char diag_warn[] = 325 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 326 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 327 print_caddr_t, diag_warn); 328 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 329 print_caddr_t, diag_warn); 330 #endif 331 332 static int 333 null_fetch_syscall_args(struct thread *td __unused, 334 struct syscall_args *sa __unused) 335 { 336 337 panic("null_fetch_syscall_args"); 338 } 339 340 static void 341 null_set_syscall_retval(struct thread *td __unused, int error __unused) 342 { 343 344 panic("null_set_syscall_retval"); 345 } 346 347 struct sysentvec null_sysvec = { 348 .sv_size = 0, 349 .sv_table = NULL, 350 .sv_mask = 0, 351 .sv_sigsize = 0, 352 .sv_sigtbl = NULL, 353 .sv_errsize = 0, 354 .sv_errtbl = NULL, 355 .sv_transtrap = NULL, 356 .sv_fixup = NULL, 357 .sv_sendsig = NULL, 358 .sv_sigcode = NULL, 359 .sv_szsigcode = NULL, 360 .sv_prepsyscall = NULL, 361 .sv_name = "null", 362 .sv_coredump = NULL, 363 .sv_imgact_try = NULL, 364 .sv_minsigstksz = 0, 365 .sv_pagesize = PAGE_SIZE, 366 .sv_minuser = VM_MIN_ADDRESS, 367 .sv_maxuser = VM_MAXUSER_ADDRESS, 368 .sv_usrstack = USRSTACK, 369 .sv_psstrings = PS_STRINGS, 370 .sv_stackprot = VM_PROT_ALL, 371 .sv_copyout_strings = NULL, 372 .sv_setregs = NULL, 373 .sv_fixlimit = NULL, 374 .sv_maxssiz = NULL, 375 .sv_flags = 0, 376 .sv_set_syscall_retval = null_set_syscall_retval, 377 .sv_fetch_syscall_args = null_fetch_syscall_args, 378 .sv_syscallnames = NULL, 379 .sv_schedtail = NULL, 380 }; 381 382 /* 383 *************************************************************************** 384 **** 385 **** The two following SYSINIT's are proc0 specific glue code. I am not 386 **** convinced that they can not be safely combined, but their order of 387 **** operation has been maintained as the same as the original init_main.c 388 **** for right now. 389 **** 390 **** These probably belong in init_proc.c or kern_proc.c, since they 391 **** deal with proc0 (the fork template process). 392 **** 393 *************************************************************************** 394 */ 395 /* ARGSUSED*/ 396 static void 397 proc0_init(void *dummy __unused) 398 { 399 struct proc *p; 400 unsigned i; 401 struct thread *td; 402 403 GIANT_REQUIRED; 404 p = &proc0; 405 td = &thread0; 406 407 /* 408 * Initialize magic number and osrel. 409 */ 410 p->p_magic = P_MAGIC; 411 p->p_osrel = osreldate; 412 413 /* 414 * Initialize thread and process structures. 415 */ 416 procinit(); /* set up proc zone */ 417 threadinit(); /* set up UMA zones */ 418 419 /* 420 * Initialise scheduler resources. 421 * Add scheduler specific parts to proc, thread as needed. 422 */ 423 schedinit(); /* scheduler gets its house in order */ 424 /* 425 * Initialize sleep queue hash table 426 */ 427 sleepinit(); 428 429 /* 430 * additional VM structures 431 */ 432 vm_init2(); 433 434 /* 435 * Create process 0 (the swapper). 436 */ 437 LIST_INSERT_HEAD(&allproc, p, p_list); 438 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 439 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 440 p->p_pgrp = &pgrp0; 441 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 442 LIST_INIT(&pgrp0.pg_members); 443 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 444 445 pgrp0.pg_session = &session0; 446 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 447 refcount_init(&session0.s_count, 1); 448 session0.s_leader = p; 449 450 p->p_sysent = &null_sysvec; 451 p->p_flag = P_SYSTEM | P_INMEM; 452 p->p_state = PRS_NORMAL; 453 knlist_init_mtx(&p->p_klist, &p->p_mtx); 454 STAILQ_INIT(&p->p_ktr); 455 p->p_nice = NZERO; 456 td->td_tid = PID_MAX + 1; 457 td->td_state = TDS_RUNNING; 458 td->td_pri_class = PRI_TIMESHARE; 459 td->td_user_pri = PUSER; 460 td->td_base_user_pri = PUSER; 461 td->td_priority = PVM; 462 td->td_base_pri = PVM; 463 td->td_oncpu = 0; 464 td->td_flags = TDF_INMEM|TDP_KTHREAD; 465 td->td_cpuset = cpuset_thread0(); 466 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 467 p->p_peers = 0; 468 p->p_leader = p; 469 470 471 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 472 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 473 474 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 475 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 476 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 477 478 /* Create credentials. */ 479 p->p_ucred = crget(); 480 p->p_ucred->cr_ngroups = 1; /* group 0 */ 481 p->p_ucred->cr_uidinfo = uifind(0); 482 p->p_ucred->cr_ruidinfo = uifind(0); 483 p->p_ucred->cr_prison = &prison0; 484 #ifdef AUDIT 485 audit_cred_kproc0(p->p_ucred); 486 #endif 487 #ifdef MAC 488 mac_cred_create_swapper(p->p_ucred); 489 #endif 490 td->td_ucred = crhold(p->p_ucred); 491 492 /* Create sigacts. */ 493 p->p_sigacts = sigacts_alloc(); 494 495 /* Initialize signal state for process 0. */ 496 siginit(&proc0); 497 498 /* Create the file descriptor table. */ 499 p->p_fd = fdinit(NULL); 500 p->p_fdtol = NULL; 501 502 /* Create the limits structures. */ 503 p->p_limit = lim_alloc(); 504 for (i = 0; i < RLIM_NLIMITS; i++) 505 p->p_limit->pl_rlimit[i].rlim_cur = 506 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 507 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 508 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 509 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 510 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 511 i = ptoa(cnt.v_free_count); 512 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i; 513 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 514 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 515 p->p_cpulimit = RLIM_INFINITY; 516 517 p->p_stats = pstats_alloc(); 518 519 /* Allocate a prototype map so we have something to fork. */ 520 pmap_pinit0(vmspace_pmap(&vmspace0)); 521 p->p_vmspace = &vmspace0; 522 vmspace0.vm_refcnt = 1; 523 524 /* 525 * proc0 is not expected to enter usermode, so there is no special 526 * handling for sv_minuser here, like is done for exec_new_vmspace(). 527 */ 528 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 529 p->p_sysent->sv_maxuser); 530 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 531 532 /*- 533 * call the init and ctor for the new thread and proc 534 * we wait to do this until all other structures 535 * are fairly sane. 536 */ 537 EVENTHANDLER_INVOKE(process_init, p); 538 EVENTHANDLER_INVOKE(thread_init, td); 539 EVENTHANDLER_INVOKE(process_ctor, p); 540 EVENTHANDLER_INVOKE(thread_ctor, td); 541 542 /* 543 * Charge root for one process. 544 */ 545 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 546 } 547 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 548 549 /* ARGSUSED*/ 550 static void 551 proc0_post(void *dummy __unused) 552 { 553 struct timespec ts; 554 struct proc *p; 555 struct rusage ru; 556 struct thread *td; 557 558 /* 559 * Now we can look at the time, having had a chance to verify the 560 * time from the filesystem. Pretend that proc0 started now. 561 */ 562 sx_slock(&allproc_lock); 563 FOREACH_PROC_IN_SYSTEM(p) { 564 microuptime(&p->p_stats->p_start); 565 PROC_SLOCK(p); 566 rufetch(p, &ru); /* Clears thread stats */ 567 PROC_SUNLOCK(p); 568 p->p_rux.rux_runtime = 0; 569 p->p_rux.rux_uticks = 0; 570 p->p_rux.rux_sticks = 0; 571 p->p_rux.rux_iticks = 0; 572 FOREACH_THREAD_IN_PROC(p, td) { 573 td->td_runtime = 0; 574 } 575 } 576 sx_sunlock(&allproc_lock); 577 PCPU_SET(switchtime, cpu_ticks()); 578 PCPU_SET(switchticks, ticks); 579 580 /* 581 * Give the ``random'' number generator a thump. 582 */ 583 nanotime(&ts); 584 srandom(ts.tv_sec ^ ts.tv_nsec); 585 } 586 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 587 588 static void 589 random_init(void *dummy __unused) 590 { 591 592 /* 593 * After CPU has been started we have some randomness on most 594 * platforms via get_cyclecount(). For platforms that don't 595 * we will reseed random(9) in proc0_post() as well. 596 */ 597 srandom(get_cyclecount()); 598 } 599 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 600 601 /* 602 *************************************************************************** 603 **** 604 **** The following SYSINIT's and glue code should be moved to the 605 **** respective files on a per subsystem basis. 606 **** 607 *************************************************************************** 608 */ 609 610 611 /* 612 *************************************************************************** 613 **** 614 **** The following code probably belongs in another file, like 615 **** kern/init_init.c. 616 **** 617 *************************************************************************** 618 */ 619 620 /* 621 * List of paths to try when searching for "init". 622 */ 623 static char init_path[MAXPATHLEN] = 624 #ifdef INIT_PATH 625 __XSTRING(INIT_PATH); 626 #else 627 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 628 #endif 629 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 630 "Path used to search the init process"); 631 632 /* 633 * Shutdown timeout of init(8). 634 * Unused within kernel, but used to control init(8), hence do not remove. 635 */ 636 #ifndef INIT_SHUTDOWN_TIMEOUT 637 #define INIT_SHUTDOWN_TIMEOUT 120 638 #endif 639 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 640 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 641 CTLFLAG_RW, &init_shutdown_timeout, 0, ""); 642 643 /* 644 * Start the initial user process; try exec'ing each pathname in init_path. 645 * The program is invoked with one argument containing the boot flags. 646 */ 647 static void 648 start_init(void *dummy) 649 { 650 vm_offset_t addr; 651 struct execve_args args; 652 int options, error; 653 char *var, *path, *next, *s; 654 char *ucp, **uap, *arg0, *arg1; 655 struct thread *td; 656 struct proc *p; 657 658 mtx_lock(&Giant); 659 660 GIANT_REQUIRED; 661 662 td = curthread; 663 p = td->td_proc; 664 665 vfs_mountroot(); 666 667 /* 668 * Need just enough stack to hold the faked-up "execve()" arguments. 669 */ 670 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 671 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 672 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 673 panic("init: couldn't allocate argument space"); 674 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 675 p->p_vmspace->vm_ssize = 1; 676 677 if ((var = getenv("init_path")) != NULL) { 678 strlcpy(init_path, var, sizeof(init_path)); 679 freeenv(var); 680 } 681 682 for (path = init_path; *path != '\0'; path = next) { 683 while (*path == ':') 684 path++; 685 if (*path == '\0') 686 break; 687 for (next = path; *next != '\0' && *next != ':'; next++) 688 /* nothing */ ; 689 if (bootverbose) 690 printf("start_init: trying %.*s\n", (int)(next - path), 691 path); 692 693 /* 694 * Move out the boot flag argument. 695 */ 696 options = 0; 697 ucp = (char *)p->p_sysent->sv_usrstack; 698 (void)subyte(--ucp, 0); /* trailing zero */ 699 if (boothowto & RB_SINGLE) { 700 (void)subyte(--ucp, 's'); 701 options = 1; 702 } 703 #ifdef notyet 704 if (boothowto & RB_FASTBOOT) { 705 (void)subyte(--ucp, 'f'); 706 options = 1; 707 } 708 #endif 709 710 #ifdef BOOTCDROM 711 (void)subyte(--ucp, 'C'); 712 options = 1; 713 #endif 714 715 if (options == 0) 716 (void)subyte(--ucp, '-'); 717 (void)subyte(--ucp, '-'); /* leading hyphen */ 718 arg1 = ucp; 719 720 /* 721 * Move out the file name (also arg 0). 722 */ 723 (void)subyte(--ucp, 0); 724 for (s = next - 1; s >= path; s--) 725 (void)subyte(--ucp, *s); 726 arg0 = ucp; 727 728 /* 729 * Move out the arg pointers. 730 */ 731 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 732 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 733 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 734 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 735 736 /* 737 * Point at the arguments. 738 */ 739 args.fname = arg0; 740 args.argv = uap; 741 args.envv = NULL; 742 743 /* 744 * Now try to exec the program. If can't for any reason 745 * other than it doesn't exist, complain. 746 * 747 * Otherwise, return via fork_trampoline() all the way 748 * to user mode as init! 749 */ 750 if ((error = execve(td, &args)) == 0) { 751 mtx_unlock(&Giant); 752 return; 753 } 754 if (error != ENOENT) 755 printf("exec %.*s: error %d\n", (int)(next - path), 756 path, error); 757 } 758 printf("init: not found in path %s\n", init_path); 759 panic("no init"); 760 } 761 762 /* 763 * Like kproc_create(), but runs in it's own address space. 764 * We do this early to reserve pid 1. 765 * 766 * Note special case - do not make it runnable yet. Other work 767 * in progress will change this more. 768 */ 769 static void 770 create_init(const void *udata __unused) 771 { 772 struct ucred *newcred, *oldcred; 773 int error; 774 775 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 776 if (error) 777 panic("cannot fork init: %d\n", error); 778 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 779 /* divorce init's credentials from the kernel's */ 780 newcred = crget(); 781 PROC_LOCK(initproc); 782 initproc->p_flag |= P_SYSTEM | P_INMEM; 783 oldcred = initproc->p_ucred; 784 crcopy(newcred, oldcred); 785 #ifdef MAC 786 mac_cred_create_init(newcred); 787 #endif 788 #ifdef AUDIT 789 audit_cred_proc1(newcred); 790 #endif 791 initproc->p_ucred = newcred; 792 PROC_UNLOCK(initproc); 793 crfree(oldcred); 794 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 795 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 796 } 797 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 798 799 /* 800 * Make it runnable now. 801 */ 802 static void 803 kick_init(const void *udata __unused) 804 { 805 struct thread *td; 806 807 td = FIRST_THREAD_IN_PROC(initproc); 808 thread_lock(td); 809 TD_SET_CAN_RUN(td); 810 sched_add(td, SRQ_BORING); 811 thread_unlock(td); 812 } 813 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
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