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/8.3/sys/kern/init_main.c 229481 2012-01-04 13:53:50Z pluknet $"); 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 } 306 307 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 308 copyright); 309 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 310 trademark); 311 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 312 313 #ifdef WITNESS 314 static char wit_warn[] = 315 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 316 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 317 print_caddr_t, wit_warn); 318 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 319 print_caddr_t, wit_warn); 320 #endif 321 322 #ifdef DIAGNOSTIC 323 static char diag_warn[] = 324 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 325 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 326 print_caddr_t, diag_warn); 327 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 328 print_caddr_t, diag_warn); 329 #endif 330 331 static int 332 null_fetch_syscall_args(struct thread *td __unused, 333 struct syscall_args *sa __unused) 334 { 335 336 panic("null_fetch_syscall_args"); 337 } 338 339 static void 340 null_set_syscall_retval(struct thread *td __unused, int error __unused) 341 { 342 343 panic("null_set_syscall_retval"); 344 } 345 346 struct sysentvec null_sysvec = { 347 .sv_size = 0, 348 .sv_table = NULL, 349 .sv_mask = 0, 350 .sv_sigsize = 0, 351 .sv_sigtbl = NULL, 352 .sv_errsize = 0, 353 .sv_errtbl = NULL, 354 .sv_transtrap = NULL, 355 .sv_fixup = NULL, 356 .sv_sendsig = NULL, 357 .sv_sigcode = NULL, 358 .sv_szsigcode = NULL, 359 .sv_prepsyscall = NULL, 360 .sv_name = "null", 361 .sv_coredump = NULL, 362 .sv_imgact_try = NULL, 363 .sv_minsigstksz = 0, 364 .sv_pagesize = PAGE_SIZE, 365 .sv_minuser = VM_MIN_ADDRESS, 366 .sv_maxuser = VM_MAXUSER_ADDRESS, 367 .sv_usrstack = USRSTACK, 368 .sv_psstrings = PS_STRINGS, 369 .sv_stackprot = VM_PROT_ALL, 370 .sv_copyout_strings = NULL, 371 .sv_setregs = NULL, 372 .sv_fixlimit = NULL, 373 .sv_maxssiz = NULL, 374 .sv_flags = 0, 375 .sv_set_syscall_retval = null_set_syscall_retval, 376 .sv_fetch_syscall_args = null_fetch_syscall_args, 377 .sv_syscallnames = NULL, 378 .sv_schedtail = NULL, 379 }; 380 381 /* 382 *************************************************************************** 383 **** 384 **** The two following SYSINIT's are proc0 specific glue code. I am not 385 **** convinced that they can not be safely combined, but their order of 386 **** operation has been maintained as the same as the original init_main.c 387 **** for right now. 388 **** 389 **** These probably belong in init_proc.c or kern_proc.c, since they 390 **** deal with proc0 (the fork template process). 391 **** 392 *************************************************************************** 393 */ 394 /* ARGSUSED*/ 395 static void 396 proc0_init(void *dummy __unused) 397 { 398 struct proc *p; 399 unsigned i; 400 struct thread *td; 401 402 GIANT_REQUIRED; 403 p = &proc0; 404 td = &thread0; 405 406 /* 407 * Initialize magic number and osrel. 408 */ 409 p->p_magic = P_MAGIC; 410 p->p_osrel = osreldate; 411 412 /* 413 * Initialize thread and process structures. 414 */ 415 procinit(); /* set up proc zone */ 416 threadinit(); /* set up UMA zones */ 417 418 /* 419 * Initialise scheduler resources. 420 * Add scheduler specific parts to proc, thread as needed. 421 */ 422 schedinit(); /* scheduler gets its house in order */ 423 /* 424 * Initialize sleep queue hash table 425 */ 426 sleepinit(); 427 428 /* 429 * additional VM structures 430 */ 431 vm_init2(); 432 433 /* 434 * Create process 0 (the swapper). 435 */ 436 LIST_INSERT_HEAD(&allproc, p, p_list); 437 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 438 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 439 p->p_pgrp = &pgrp0; 440 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 441 LIST_INIT(&pgrp0.pg_members); 442 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 443 444 pgrp0.pg_session = &session0; 445 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 446 refcount_init(&session0.s_count, 1); 447 session0.s_leader = p; 448 449 p->p_sysent = &null_sysvec; 450 p->p_flag = P_SYSTEM | P_INMEM; 451 p->p_state = PRS_NORMAL; 452 knlist_init_mtx(&p->p_klist, &p->p_mtx); 453 STAILQ_INIT(&p->p_ktr); 454 p->p_nice = NZERO; 455 td->td_tid = PID_MAX + 1; 456 td->td_state = TDS_RUNNING; 457 td->td_pri_class = PRI_TIMESHARE; 458 td->td_user_pri = PUSER; 459 td->td_base_user_pri = PUSER; 460 td->td_priority = PVM; 461 td->td_base_pri = PVM; 462 td->td_oncpu = 0; 463 td->td_flags = TDF_INMEM|TDP_KTHREAD; 464 td->td_cpuset = cpuset_thread0(); 465 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 466 p->p_peers = 0; 467 p->p_leader = p; 468 469 470 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 471 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 472 473 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 474 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 475 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 476 477 /* Create credentials. */ 478 p->p_ucred = crget(); 479 p->p_ucred->cr_ngroups = 1; /* group 0 */ 480 p->p_ucred->cr_uidinfo = uifind(0); 481 p->p_ucred->cr_ruidinfo = uifind(0); 482 p->p_ucred->cr_prison = &prison0; 483 #ifdef AUDIT 484 audit_cred_kproc0(p->p_ucred); 485 #endif 486 #ifdef MAC 487 mac_cred_create_swapper(p->p_ucred); 488 #endif 489 td->td_ucred = crhold(p->p_ucred); 490 491 /* Create sigacts. */ 492 p->p_sigacts = sigacts_alloc(); 493 494 /* Initialize signal state for process 0. */ 495 siginit(&proc0); 496 497 /* Create the file descriptor table. */ 498 p->p_fd = fdinit(NULL); 499 p->p_fdtol = NULL; 500 501 /* Create the limits structures. */ 502 p->p_limit = lim_alloc(); 503 for (i = 0; i < RLIM_NLIMITS; i++) 504 p->p_limit->pl_rlimit[i].rlim_cur = 505 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 506 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 507 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 508 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 509 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 510 i = ptoa(cnt.v_free_count); 511 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i; 512 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 513 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 514 p->p_cpulimit = RLIM_INFINITY; 515 516 p->p_stats = pstats_alloc(); 517 518 /* Allocate a prototype map so we have something to fork. */ 519 pmap_pinit0(vmspace_pmap(&vmspace0)); 520 p->p_vmspace = &vmspace0; 521 vmspace0.vm_refcnt = 1; 522 523 /* 524 * proc0 is not expected to enter usermode, so there is no special 525 * handling for sv_minuser here, like is done for exec_new_vmspace(). 526 */ 527 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 528 p->p_sysent->sv_maxuser); 529 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 530 531 /*- 532 * call the init and ctor for the new thread and proc 533 * we wait to do this until all other structures 534 * are fairly sane. 535 */ 536 EVENTHANDLER_INVOKE(process_init, p); 537 EVENTHANDLER_INVOKE(thread_init, td); 538 EVENTHANDLER_INVOKE(process_ctor, p); 539 EVENTHANDLER_INVOKE(thread_ctor, td); 540 541 /* 542 * Charge root for one process. 543 */ 544 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 545 } 546 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 547 548 /* ARGSUSED*/ 549 static void 550 proc0_post(void *dummy __unused) 551 { 552 struct timespec ts; 553 struct proc *p; 554 struct rusage ru; 555 struct thread *td; 556 557 /* 558 * Now we can look at the time, having had a chance to verify the 559 * time from the filesystem. Pretend that proc0 started now. 560 */ 561 sx_slock(&allproc_lock); 562 FOREACH_PROC_IN_SYSTEM(p) { 563 microuptime(&p->p_stats->p_start); 564 PROC_SLOCK(p); 565 rufetch(p, &ru); /* Clears thread stats */ 566 PROC_SUNLOCK(p); 567 p->p_rux.rux_runtime = 0; 568 p->p_rux.rux_uticks = 0; 569 p->p_rux.rux_sticks = 0; 570 p->p_rux.rux_iticks = 0; 571 FOREACH_THREAD_IN_PROC(p, td) { 572 td->td_runtime = 0; 573 } 574 } 575 sx_sunlock(&allproc_lock); 576 PCPU_SET(switchtime, cpu_ticks()); 577 PCPU_SET(switchticks, ticks); 578 579 /* 580 * Give the ``random'' number generator a thump. 581 */ 582 nanotime(&ts); 583 srandom(ts.tv_sec ^ ts.tv_nsec); 584 } 585 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 586 587 static void 588 random_init(void *dummy __unused) 589 { 590 591 /* 592 * After CPU has been started we have some randomness on most 593 * platforms via get_cyclecount(). For platforms that don't 594 * we will reseed random(9) in proc0_post() as well. 595 */ 596 srandom(get_cyclecount()); 597 } 598 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 599 600 /* 601 *************************************************************************** 602 **** 603 **** The following SYSINIT's and glue code should be moved to the 604 **** respective files on a per subsystem basis. 605 **** 606 *************************************************************************** 607 */ 608 609 610 /* 611 *************************************************************************** 612 **** 613 **** The following code probably belongs in another file, like 614 **** kern/init_init.c. 615 **** 616 *************************************************************************** 617 */ 618 619 /* 620 * List of paths to try when searching for "init". 621 */ 622 static char init_path[MAXPATHLEN] = 623 #ifdef INIT_PATH 624 __XSTRING(INIT_PATH); 625 #else 626 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 627 #endif 628 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 629 "Path used to search the init process"); 630 631 /* 632 * Shutdown timeout of init(8). 633 * Unused within kernel, but used to control init(8), hence do not remove. 634 */ 635 #ifndef INIT_SHUTDOWN_TIMEOUT 636 #define INIT_SHUTDOWN_TIMEOUT 120 637 #endif 638 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 639 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 640 CTLFLAG_RW, &init_shutdown_timeout, 0, ""); 641 642 /* 643 * Start the initial user process; try exec'ing each pathname in init_path. 644 * The program is invoked with one argument containing the boot flags. 645 */ 646 static void 647 start_init(void *dummy) 648 { 649 vm_offset_t addr; 650 struct execve_args args; 651 int options, error; 652 char *var, *path, *next, *s; 653 char *ucp, **uap, *arg0, *arg1; 654 struct thread *td; 655 struct proc *p; 656 657 mtx_lock(&Giant); 658 659 GIANT_REQUIRED; 660 661 td = curthread; 662 p = td->td_proc; 663 664 vfs_mountroot(); 665 666 /* 667 * Need just enough stack to hold the faked-up "execve()" arguments. 668 */ 669 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 670 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 671 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 672 panic("init: couldn't allocate argument space"); 673 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 674 p->p_vmspace->vm_ssize = 1; 675 676 if ((var = getenv("init_path")) != NULL) { 677 strlcpy(init_path, var, sizeof(init_path)); 678 freeenv(var); 679 } 680 681 for (path = init_path; *path != '\0'; path = next) { 682 while (*path == ':') 683 path++; 684 if (*path == '\0') 685 break; 686 for (next = path; *next != '\0' && *next != ':'; next++) 687 /* nothing */ ; 688 if (bootverbose) 689 printf("start_init: trying %.*s\n", (int)(next - path), 690 path); 691 692 /* 693 * Move out the boot flag argument. 694 */ 695 options = 0; 696 ucp = (char *)p->p_sysent->sv_usrstack; 697 (void)subyte(--ucp, 0); /* trailing zero */ 698 if (boothowto & RB_SINGLE) { 699 (void)subyte(--ucp, 's'); 700 options = 1; 701 } 702 #ifdef notyet 703 if (boothowto & RB_FASTBOOT) { 704 (void)subyte(--ucp, 'f'); 705 options = 1; 706 } 707 #endif 708 709 #ifdef BOOTCDROM 710 (void)subyte(--ucp, 'C'); 711 options = 1; 712 #endif 713 714 if (options == 0) 715 (void)subyte(--ucp, '-'); 716 (void)subyte(--ucp, '-'); /* leading hyphen */ 717 arg1 = ucp; 718 719 /* 720 * Move out the file name (also arg 0). 721 */ 722 (void)subyte(--ucp, 0); 723 for (s = next - 1; s >= path; s--) 724 (void)subyte(--ucp, *s); 725 arg0 = ucp; 726 727 /* 728 * Move out the arg pointers. 729 */ 730 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 731 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 732 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 733 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 734 735 /* 736 * Point at the arguments. 737 */ 738 args.fname = arg0; 739 args.argv = uap; 740 args.envv = NULL; 741 742 /* 743 * Now try to exec the program. If can't for any reason 744 * other than it doesn't exist, complain. 745 * 746 * Otherwise, return via fork_trampoline() all the way 747 * to user mode as init! 748 */ 749 if ((error = execve(td, &args)) == 0) { 750 mtx_unlock(&Giant); 751 return; 752 } 753 if (error != ENOENT) 754 printf("exec %.*s: error %d\n", (int)(next - path), 755 path, error); 756 } 757 printf("init: not found in path %s\n", init_path); 758 panic("no init"); 759 } 760 761 /* 762 * Like kproc_create(), but runs in it's own address space. 763 * We do this early to reserve pid 1. 764 * 765 * Note special case - do not make it runnable yet. Other work 766 * in progress will change this more. 767 */ 768 static void 769 create_init(const void *udata __unused) 770 { 771 struct ucred *newcred, *oldcred; 772 int error; 773 774 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 775 if (error) 776 panic("cannot fork init: %d\n", error); 777 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 778 /* divorce init's credentials from the kernel's */ 779 newcred = crget(); 780 PROC_LOCK(initproc); 781 initproc->p_flag |= P_SYSTEM | P_INMEM; 782 oldcred = initproc->p_ucred; 783 crcopy(newcred, oldcred); 784 #ifdef MAC 785 mac_cred_create_init(newcred); 786 #endif 787 #ifdef AUDIT 788 audit_cred_proc1(newcred); 789 #endif 790 initproc->p_ucred = newcred; 791 PROC_UNLOCK(initproc); 792 crfree(oldcred); 793 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 794 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 795 } 796 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 797 798 /* 799 * Make it runnable now. 800 */ 801 static void 802 kick_init(const void *udata __unused) 803 { 804 struct thread *td; 805 806 td = FIRST_THREAD_IN_PROC(initproc); 807 thread_lock(td); 808 TD_SET_CAN_RUN(td); 809 sched_add(td, SRQ_BORING); 810 thread_unlock(td); 811 } 812 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: 741e7a673ab5fdf36bde38963f366eec
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