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("$FreeBSD$"); 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 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 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 274 mtx_unlock(&Giant); 275 276 /* 277 * Now hand over this thread to swapper. 278 */ 279 swapper(); 280 /* NOTREACHED*/ 281 } 282 283 284 /* 285 *************************************************************************** 286 **** 287 **** The following SYSINIT's belong elsewhere, but have not yet 288 **** been moved. 289 **** 290 *************************************************************************** 291 */ 292 static void 293 print_caddr_t(void *data) 294 { 295 printf("%s", (char *)data); 296 } 297 298 static void 299 print_version(void *data __unused) 300 { 301 int len; 302 303 /* Strip a trailing newline from version. */ 304 len = strlen(version); 305 while (len > 0 && version[len - 1] == '\n') 306 len--; 307 printf("%.*s %s\n", len, version, machine); 308 printf("%s\n", compiler_version); 309 } 310 311 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 312 copyright); 313 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 314 trademark); 315 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 316 317 #ifdef WITNESS 318 static char wit_warn[] = 319 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 320 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 321 print_caddr_t, wit_warn); 322 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 323 print_caddr_t, wit_warn); 324 #endif 325 326 #ifdef DIAGNOSTIC 327 static char diag_warn[] = 328 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 329 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 330 print_caddr_t, diag_warn); 331 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 332 print_caddr_t, diag_warn); 333 #endif 334 335 static int 336 null_fetch_syscall_args(struct thread *td __unused, 337 struct syscall_args *sa __unused) 338 { 339 340 panic("null_fetch_syscall_args"); 341 } 342 343 static void 344 null_set_syscall_retval(struct thread *td __unused, int error __unused) 345 { 346 347 panic("null_set_syscall_retval"); 348 } 349 350 struct sysentvec null_sysvec = { 351 .sv_size = 0, 352 .sv_table = NULL, 353 .sv_mask = 0, 354 .sv_sigsize = 0, 355 .sv_sigtbl = NULL, 356 .sv_errsize = 0, 357 .sv_errtbl = NULL, 358 .sv_transtrap = NULL, 359 .sv_fixup = NULL, 360 .sv_sendsig = NULL, 361 .sv_sigcode = NULL, 362 .sv_szsigcode = NULL, 363 .sv_prepsyscall = NULL, 364 .sv_name = "null", 365 .sv_coredump = NULL, 366 .sv_imgact_try = NULL, 367 .sv_minsigstksz = 0, 368 .sv_pagesize = PAGE_SIZE, 369 .sv_minuser = VM_MIN_ADDRESS, 370 .sv_maxuser = VM_MAXUSER_ADDRESS, 371 .sv_usrstack = USRSTACK, 372 .sv_psstrings = PS_STRINGS, 373 .sv_stackprot = VM_PROT_ALL, 374 .sv_copyout_strings = NULL, 375 .sv_setregs = NULL, 376 .sv_fixlimit = NULL, 377 .sv_maxssiz = NULL, 378 .sv_flags = 0, 379 .sv_set_syscall_retval = null_set_syscall_retval, 380 .sv_fetch_syscall_args = null_fetch_syscall_args, 381 .sv_syscallnames = NULL, 382 .sv_schedtail = NULL, 383 }; 384 385 /* 386 *************************************************************************** 387 **** 388 **** The two following SYSINIT's are proc0 specific glue code. I am not 389 **** convinced that they can not be safely combined, but their order of 390 **** operation has been maintained as the same as the original init_main.c 391 **** for right now. 392 **** 393 **** These probably belong in init_proc.c or kern_proc.c, since they 394 **** deal with proc0 (the fork template process). 395 **** 396 *************************************************************************** 397 */ 398 /* ARGSUSED*/ 399 static void 400 proc0_init(void *dummy __unused) 401 { 402 struct proc *p; 403 unsigned i; 404 struct thread *td; 405 406 GIANT_REQUIRED; 407 p = &proc0; 408 td = &thread0; 409 410 /* 411 * Initialize magic number and osrel. 412 */ 413 p->p_magic = P_MAGIC; 414 p->p_osrel = osreldate; 415 416 /* 417 * Initialize thread and process structures. 418 */ 419 procinit(); /* set up proc zone */ 420 threadinit(); /* set up UMA zones */ 421 422 /* 423 * Initialise scheduler resources. 424 * Add scheduler specific parts to proc, thread as needed. 425 */ 426 schedinit(); /* scheduler gets its house in order */ 427 /* 428 * Initialize sleep queue hash table 429 */ 430 sleepinit(); 431 432 /* 433 * additional VM structures 434 */ 435 vm_init2(); 436 437 /* 438 * Create process 0 (the swapper). 439 */ 440 LIST_INSERT_HEAD(&allproc, p, p_list); 441 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 442 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 443 p->p_pgrp = &pgrp0; 444 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 445 LIST_INIT(&pgrp0.pg_members); 446 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 447 448 pgrp0.pg_session = &session0; 449 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 450 refcount_init(&session0.s_count, 1); 451 session0.s_leader = p; 452 453 p->p_sysent = &null_sysvec; 454 p->p_flag = P_SYSTEM | P_INMEM | P_KTHREAD; 455 p->p_state = PRS_NORMAL; 456 knlist_init_mtx(&p->p_klist, &p->p_mtx); 457 STAILQ_INIT(&p->p_ktr); 458 p->p_nice = NZERO; 459 td->td_tid = PID_MAX + 1; 460 td->td_state = TDS_RUNNING; 461 td->td_pri_class = PRI_TIMESHARE; 462 td->td_user_pri = PUSER; 463 td->td_base_user_pri = PUSER; 464 td->td_priority = PVM; 465 td->td_base_pri = PVM; 466 td->td_oncpu = 0; 467 td->td_flags = TDF_INMEM|TDP_KTHREAD; 468 td->td_cpuset = cpuset_thread0(); 469 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 470 p->p_peers = 0; 471 p->p_leader = p; 472 473 474 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 475 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 476 477 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 478 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 479 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 480 481 /* Create credentials. */ 482 p->p_ucred = crget(); 483 p->p_ucred->cr_ngroups = 1; /* group 0 */ 484 p->p_ucred->cr_uidinfo = uifind(0); 485 p->p_ucred->cr_ruidinfo = uifind(0); 486 p->p_ucred->cr_prison = &prison0; 487 #ifdef AUDIT 488 audit_cred_kproc0(p->p_ucred); 489 #endif 490 #ifdef MAC 491 mac_cred_create_swapper(p->p_ucred); 492 #endif 493 td->td_ucred = crhold(p->p_ucred); 494 495 /* Create sigacts. */ 496 p->p_sigacts = sigacts_alloc(); 497 498 /* Initialize signal state for process 0. */ 499 siginit(&proc0); 500 501 /* Create the file descriptor table. */ 502 p->p_fd = fdinit(NULL); 503 p->p_fdtol = NULL; 504 505 /* Create the limits structures. */ 506 p->p_limit = lim_alloc(); 507 for (i = 0; i < RLIM_NLIMITS; i++) 508 p->p_limit->pl_rlimit[i].rlim_cur = 509 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 510 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 511 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 512 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 513 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 514 i = ptoa(cnt.v_free_count); 515 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i; 516 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 517 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 518 p->p_cpulimit = RLIM_INFINITY; 519 520 p->p_stats = pstats_alloc(); 521 522 /* Allocate a prototype map so we have something to fork. */ 523 pmap_pinit0(vmspace_pmap(&vmspace0)); 524 p->p_vmspace = &vmspace0; 525 vmspace0.vm_refcnt = 1; 526 527 /* 528 * proc0 is not expected to enter usermode, so there is no special 529 * handling for sv_minuser here, like is done for exec_new_vmspace(). 530 */ 531 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 532 p->p_sysent->sv_maxuser); 533 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 534 535 /*- 536 * call the init and ctor for the new thread and proc 537 * we wait to do this until all other structures 538 * are fairly sane. 539 */ 540 EVENTHANDLER_INVOKE(process_init, p); 541 EVENTHANDLER_INVOKE(thread_init, td); 542 EVENTHANDLER_INVOKE(process_ctor, p); 543 EVENTHANDLER_INVOKE(thread_ctor, td); 544 545 /* 546 * Charge root for one process. 547 */ 548 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 549 } 550 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 551 552 /* ARGSUSED*/ 553 static void 554 proc0_post(void *dummy __unused) 555 { 556 struct timespec ts; 557 struct proc *p; 558 struct rusage ru; 559 struct thread *td; 560 561 /* 562 * Now we can look at the time, having had a chance to verify the 563 * time from the filesystem. Pretend that proc0 started now. 564 */ 565 sx_slock(&allproc_lock); 566 FOREACH_PROC_IN_SYSTEM(p) { 567 microuptime(&p->p_stats->p_start); 568 PROC_SLOCK(p); 569 rufetch(p, &ru); /* Clears thread stats */ 570 PROC_SUNLOCK(p); 571 p->p_rux.rux_runtime = 0; 572 p->p_rux.rux_uticks = 0; 573 p->p_rux.rux_sticks = 0; 574 p->p_rux.rux_iticks = 0; 575 FOREACH_THREAD_IN_PROC(p, td) { 576 td->td_runtime = 0; 577 } 578 } 579 sx_sunlock(&allproc_lock); 580 PCPU_SET(switchtime, cpu_ticks()); 581 PCPU_SET(switchticks, ticks); 582 583 /* 584 * Give the ``random'' number generator a thump. 585 */ 586 nanotime(&ts); 587 srandom(ts.tv_sec ^ ts.tv_nsec); 588 } 589 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 590 591 static void 592 random_init(void *dummy __unused) 593 { 594 595 /* 596 * After CPU has been started we have some randomness on most 597 * platforms via get_cyclecount(). For platforms that don't 598 * we will reseed random(9) in proc0_post() as well. 599 */ 600 srandom(get_cyclecount()); 601 } 602 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 603 604 /* 605 *************************************************************************** 606 **** 607 **** The following SYSINIT's and glue code should be moved to the 608 **** respective files on a per subsystem basis. 609 **** 610 *************************************************************************** 611 */ 612 613 614 /* 615 *************************************************************************** 616 **** 617 **** The following code probably belongs in another file, like 618 **** kern/init_init.c. 619 **** 620 *************************************************************************** 621 */ 622 623 /* 624 * List of paths to try when searching for "init". 625 */ 626 static char init_path[MAXPATHLEN] = 627 #ifdef INIT_PATH 628 __XSTRING(INIT_PATH); 629 #else 630 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 631 #endif 632 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 633 "Path used to search the init process"); 634 635 /* 636 * Shutdown timeout of init(8). 637 * Unused within kernel, but used to control init(8), hence do not remove. 638 */ 639 #ifndef INIT_SHUTDOWN_TIMEOUT 640 #define INIT_SHUTDOWN_TIMEOUT 120 641 #endif 642 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 643 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 644 CTLFLAG_RW, &init_shutdown_timeout, 0, ""); 645 646 /* 647 * Start the initial user process; try exec'ing each pathname in init_path. 648 * The program is invoked with one argument containing the boot flags. 649 */ 650 static void 651 start_init(void *dummy) 652 { 653 vm_offset_t addr; 654 struct execve_args args; 655 int options, error; 656 char *var, *path, *next, *s; 657 char *ucp, **uap, *arg0, *arg1; 658 struct thread *td; 659 struct proc *p; 660 661 mtx_lock(&Giant); 662 663 GIANT_REQUIRED; 664 665 td = curthread; 666 p = td->td_proc; 667 668 vfs_mountroot(); 669 670 /* 671 * Need just enough stack to hold the faked-up "execve()" arguments. 672 */ 673 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 674 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 675 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 676 panic("init: couldn't allocate argument space"); 677 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 678 p->p_vmspace->vm_ssize = 1; 679 680 if ((var = getenv("init_path")) != NULL) { 681 strlcpy(init_path, var, sizeof(init_path)); 682 freeenv(var); 683 } 684 685 for (path = init_path; *path != '\0'; path = next) { 686 while (*path == ':') 687 path++; 688 if (*path == '\0') 689 break; 690 for (next = path; *next != '\0' && *next != ':'; next++) 691 /* nothing */ ; 692 if (bootverbose) 693 printf("start_init: trying %.*s\n", (int)(next - path), 694 path); 695 696 /* 697 * Move out the boot flag argument. 698 */ 699 options = 0; 700 ucp = (char *)p->p_sysent->sv_usrstack; 701 (void)subyte(--ucp, 0); /* trailing zero */ 702 if (boothowto & RB_SINGLE) { 703 (void)subyte(--ucp, 's'); 704 options = 1; 705 } 706 #ifdef notyet 707 if (boothowto & RB_FASTBOOT) { 708 (void)subyte(--ucp, 'f'); 709 options = 1; 710 } 711 #endif 712 713 #ifdef BOOTCDROM 714 (void)subyte(--ucp, 'C'); 715 options = 1; 716 #endif 717 718 if (options == 0) 719 (void)subyte(--ucp, '-'); 720 (void)subyte(--ucp, '-'); /* leading hyphen */ 721 arg1 = ucp; 722 723 /* 724 * Move out the file name (also arg 0). 725 */ 726 (void)subyte(--ucp, 0); 727 for (s = next - 1; s >= path; s--) 728 (void)subyte(--ucp, *s); 729 arg0 = ucp; 730 731 /* 732 * Move out the arg pointers. 733 */ 734 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 735 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 736 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 737 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 738 739 /* 740 * Point at the arguments. 741 */ 742 args.fname = arg0; 743 args.argv = uap; 744 args.envv = NULL; 745 746 /* 747 * Now try to exec the program. If can't for any reason 748 * other than it doesn't exist, complain. 749 * 750 * Otherwise, return via fork_trampoline() all the way 751 * to user mode as init! 752 */ 753 if ((error = execve(td, &args)) == 0) { 754 mtx_unlock(&Giant); 755 return; 756 } 757 if (error != ENOENT) 758 printf("exec %.*s: error %d\n", (int)(next - path), 759 path, error); 760 } 761 printf("init: not found in path %s\n", init_path); 762 panic("no init"); 763 } 764 765 /* 766 * Like kproc_create(), but runs in it's own address space. 767 * We do this early to reserve pid 1. 768 * 769 * Note special case - do not make it runnable yet. Other work 770 * in progress will change this more. 771 */ 772 static void 773 create_init(const void *udata __unused) 774 { 775 struct ucred *newcred, *oldcred; 776 int error; 777 778 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 779 if (error) 780 panic("cannot fork init: %d\n", error); 781 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 782 /* divorce init's credentials from the kernel's */ 783 newcred = crget(); 784 PROC_LOCK(initproc); 785 initproc->p_flag |= P_SYSTEM | P_INMEM; 786 oldcred = initproc->p_ucred; 787 crcopy(newcred, oldcred); 788 #ifdef MAC 789 mac_cred_create_init(newcred); 790 #endif 791 #ifdef AUDIT 792 audit_cred_proc1(newcred); 793 #endif 794 initproc->p_ucred = newcred; 795 PROC_UNLOCK(initproc); 796 crfree(oldcred); 797 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 798 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 799 } 800 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 801 802 /* 803 * Make it runnable now. 804 */ 805 static void 806 kick_init(const void *udata __unused) 807 { 808 struct thread *td; 809 810 td = FIRST_THREAD_IN_PROC(initproc); 811 thread_lock(td); 812 TD_SET_CAN_RUN(td); 813 sched_add(td, SRQ_BORING); 814 thread_unlock(td); 815 } 816 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);
Cache object: f39e02cdd0642d75d15a54ac074c0b61
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]