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 "Boot control flags, passed from loader"); 105 int bootverbose; 106 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 107 "Control the output of verbose kernel messages"); 108 109 /* 110 * This ensures that there is at least one entry so that the sysinit_set 111 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 112 * executed. 113 */ 114 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 115 116 /* 117 * The sysinit table itself. Items are checked off as the are run. 118 * If we want to register new sysinit types, add them to newsysinit. 119 */ 120 SET_DECLARE(sysinit_set, struct sysinit); 121 struct sysinit **sysinit, **sysinit_end; 122 struct sysinit **newsysinit, **newsysinit_end; 123 124 /* 125 * Merge a new sysinit set into the current set, reallocating it if 126 * necessary. This can only be called after malloc is running. 127 */ 128 void 129 sysinit_add(struct sysinit **set, struct sysinit **set_end) 130 { 131 struct sysinit **newset; 132 struct sysinit **sipp; 133 struct sysinit **xipp; 134 int count; 135 136 count = set_end - set; 137 if (newsysinit) 138 count += newsysinit_end - newsysinit; 139 else 140 count += sysinit_end - sysinit; 141 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 142 if (newset == NULL) 143 panic("cannot malloc for sysinit"); 144 xipp = newset; 145 if (newsysinit) 146 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 147 *xipp++ = *sipp; 148 else 149 for (sipp = sysinit; sipp < sysinit_end; sipp++) 150 *xipp++ = *sipp; 151 for (sipp = set; sipp < set_end; sipp++) 152 *xipp++ = *sipp; 153 if (newsysinit) 154 free(newsysinit, M_TEMP); 155 newsysinit = newset; 156 newsysinit_end = newset + count; 157 } 158 159 /* 160 * System startup; initialize the world, create process 0, mount root 161 * filesystem, and fork to create init and pagedaemon. Most of the 162 * hard work is done in the lower-level initialization routines including 163 * startup(), which does memory initialization and autoconfiguration. 164 * 165 * This allows simple addition of new kernel subsystems that require 166 * boot time initialization. It also allows substitution of subsystem 167 * (for instance, a scheduler, kernel profiler, or VM system) by object 168 * module. Finally, it allows for optional "kernel threads". 169 */ 170 void 171 mi_startup(void) 172 { 173 174 register struct sysinit **sipp; /* system initialization*/ 175 register struct sysinit **xipp; /* interior loop of sort*/ 176 register struct sysinit *save; /* bubble*/ 177 178 #if defined(VERBOSE_SYSINIT) 179 int last; 180 int verbose; 181 #endif 182 183 if (sysinit == NULL) { 184 sysinit = SET_BEGIN(sysinit_set); 185 sysinit_end = SET_LIMIT(sysinit_set); 186 } 187 188 restart: 189 /* 190 * Perform a bubble sort of the system initialization objects by 191 * their subsystem (primary key) and order (secondary key). 192 */ 193 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 194 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 195 if ((*sipp)->subsystem < (*xipp)->subsystem || 196 ((*sipp)->subsystem == (*xipp)->subsystem && 197 (*sipp)->order <= (*xipp)->order)) 198 continue; /* skip*/ 199 save = *sipp; 200 *sipp = *xipp; 201 *xipp = save; 202 } 203 } 204 205 #if defined(VERBOSE_SYSINIT) 206 last = SI_SUB_COPYRIGHT; 207 verbose = 0; 208 #if !defined(DDB) 209 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 210 #endif 211 #endif 212 213 /* 214 * Traverse the (now) ordered list of system initialization tasks. 215 * Perform each task, and continue on to the next task. 216 * 217 * The last item on the list is expected to be the scheduler, 218 * which will not return. 219 */ 220 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 221 222 if ((*sipp)->subsystem == SI_SUB_DUMMY) 223 continue; /* skip dummy task(s)*/ 224 225 if ((*sipp)->subsystem == SI_SUB_DONE) 226 continue; 227 228 #if defined(VERBOSE_SYSINIT) 229 if ((*sipp)->subsystem > last) { 230 verbose = 1; 231 last = (*sipp)->subsystem; 232 printf("subsystem %x\n", last); 233 } 234 if (verbose) { 235 #if defined(DDB) 236 const char *name; 237 c_db_sym_t sym; 238 db_expr_t offset; 239 240 sym = db_search_symbol((vm_offset_t)(*sipp)->func, 241 DB_STGY_PROC, &offset); 242 db_symbol_values(sym, &name, NULL); 243 if (name != NULL) 244 printf(" %s(%p)... ", name, (*sipp)->udata); 245 else 246 #endif 247 printf(" %p(%p)... ", (*sipp)->func, 248 (*sipp)->udata); 249 } 250 #endif 251 252 /* Call function */ 253 (*((*sipp)->func))((*sipp)->udata); 254 255 #if defined(VERBOSE_SYSINIT) 256 if (verbose) 257 printf("done.\n"); 258 #endif 259 260 /* Check off the one we're just done */ 261 (*sipp)->subsystem = SI_SUB_DONE; 262 263 /* Check if we've installed more sysinit items via KLD */ 264 if (newsysinit != NULL) { 265 if (sysinit != SET_BEGIN(sysinit_set)) 266 free(sysinit, M_TEMP); 267 sysinit = newsysinit; 268 sysinit_end = newsysinit_end; 269 newsysinit = NULL; 270 newsysinit_end = NULL; 271 goto restart; 272 } 273 } 274 275 panic("Shouldn't get here!"); 276 /* NOTREACHED*/ 277 } 278 279 280 /* 281 *************************************************************************** 282 **** 283 **** The following SYSINIT's belong elsewhere, but have not yet 284 **** been moved. 285 **** 286 *************************************************************************** 287 */ 288 static void 289 print_caddr_t(void *data) 290 { 291 printf("%s", (char *)data); 292 } 293 294 static void 295 print_version(void *data __unused) 296 { 297 int len; 298 299 /* Strip a trailing newline from version. */ 300 len = strlen(version); 301 while (len > 0 && version[len - 1] == '\n') 302 len--; 303 printf("%.*s %s\n", len, version, machine); 304 } 305 306 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 307 copyright); 308 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 309 trademark); 310 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 311 312 #ifdef WITNESS 313 static char wit_warn[] = 314 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 315 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 316 print_caddr_t, wit_warn); 317 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 318 print_caddr_t, wit_warn); 319 #endif 320 321 #ifdef DIAGNOSTIC 322 static char diag_warn[] = 323 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 324 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 325 print_caddr_t, diag_warn); 326 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 327 print_caddr_t, diag_warn); 328 #endif 329 330 static void 331 set_boot_verbose(void *data __unused) 332 { 333 334 if (boothowto & RB_VERBOSE) 335 bootverbose++; 336 } 337 SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL); 338 339 static int 340 null_fetch_syscall_args(struct thread *td __unused, 341 struct syscall_args *sa __unused) 342 { 343 344 panic("null_fetch_syscall_args"); 345 } 346 347 static void 348 null_set_syscall_retval(struct thread *td __unused, int error __unused) 349 { 350 351 panic("null_set_syscall_retval"); 352 } 353 354 struct sysentvec null_sysvec = { 355 .sv_size = 0, 356 .sv_table = NULL, 357 .sv_mask = 0, 358 .sv_sigsize = 0, 359 .sv_sigtbl = NULL, 360 .sv_errsize = 0, 361 .sv_errtbl = NULL, 362 .sv_transtrap = NULL, 363 .sv_fixup = NULL, 364 .sv_sendsig = NULL, 365 .sv_sigcode = NULL, 366 .sv_szsigcode = NULL, 367 .sv_prepsyscall = NULL, 368 .sv_name = "null", 369 .sv_coredump = NULL, 370 .sv_imgact_try = NULL, 371 .sv_minsigstksz = 0, 372 .sv_pagesize = PAGE_SIZE, 373 .sv_minuser = VM_MIN_ADDRESS, 374 .sv_maxuser = VM_MAXUSER_ADDRESS, 375 .sv_usrstack = USRSTACK, 376 .sv_psstrings = PS_STRINGS, 377 .sv_stackprot = VM_PROT_ALL, 378 .sv_copyout_strings = NULL, 379 .sv_setregs = NULL, 380 .sv_fixlimit = NULL, 381 .sv_maxssiz = NULL, 382 .sv_flags = 0, 383 .sv_set_syscall_retval = null_set_syscall_retval, 384 .sv_fetch_syscall_args = null_fetch_syscall_args, 385 .sv_syscallnames = NULL, 386 }; 387 388 /* 389 *************************************************************************** 390 **** 391 **** The two following SYSINIT's are proc0 specific glue code. I am not 392 **** convinced that they can not be safely combined, but their order of 393 **** operation has been maintained as the same as the original init_main.c 394 **** for right now. 395 **** 396 **** These probably belong in init_proc.c or kern_proc.c, since they 397 **** deal with proc0 (the fork template process). 398 **** 399 *************************************************************************** 400 */ 401 /* ARGSUSED*/ 402 static void 403 proc0_init(void *dummy __unused) 404 { 405 struct proc *p; 406 struct thread *td; 407 vm_paddr_t pageablemem; 408 int i; 409 410 GIANT_REQUIRED; 411 p = &proc0; 412 td = &thread0; 413 414 /* 415 * Initialize magic number and osrel. 416 */ 417 p->p_magic = P_MAGIC; 418 p->p_osrel = osreldate; 419 420 /* 421 * Initialize thread and process structures. 422 */ 423 procinit(); /* set up proc zone */ 424 threadinit(); /* set up UMA zones */ 425 426 /* 427 * Initialise scheduler resources. 428 * Add scheduler specific parts to proc, thread as needed. 429 */ 430 schedinit(); /* scheduler gets its house in order */ 431 /* 432 * Initialize sleep queue hash table 433 */ 434 sleepinit(); 435 436 /* 437 * additional VM structures 438 */ 439 vm_init2(); 440 441 /* 442 * Create process 0 (the swapper). 443 */ 444 LIST_INSERT_HEAD(&allproc, p, p_list); 445 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 446 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 447 p->p_pgrp = &pgrp0; 448 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 449 LIST_INIT(&pgrp0.pg_members); 450 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 451 452 pgrp0.pg_session = &session0; 453 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 454 refcount_init(&session0.s_count, 1); 455 session0.s_leader = p; 456 457 p->p_sysent = &null_sysvec; 458 p->p_flag = P_SYSTEM | P_INMEM; 459 p->p_state = PRS_NORMAL; 460 knlist_init_mtx(&p->p_klist, &p->p_mtx); 461 STAILQ_INIT(&p->p_ktr); 462 p->p_nice = NZERO; 463 td->td_tid = PID_MAX + 1; 464 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 465 td->td_state = TDS_RUNNING; 466 td->td_pri_class = PRI_TIMESHARE; 467 td->td_user_pri = PUSER; 468 td->td_base_user_pri = PUSER; 469 td->td_priority = PVM; 470 td->td_base_pri = PUSER; 471 td->td_oncpu = 0; 472 td->td_flags = TDF_INMEM|TDP_KTHREAD; 473 td->td_cpuset = cpuset_thread0(); 474 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 475 p->p_peers = 0; 476 p->p_leader = p; 477 478 479 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 480 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 481 482 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 483 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 484 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 485 486 /* Create credentials. */ 487 p->p_ucred = crget(); 488 p->p_ucred->cr_ngroups = 1; /* group 0 */ 489 p->p_ucred->cr_uidinfo = uifind(0); 490 p->p_ucred->cr_ruidinfo = uifind(0); 491 p->p_ucred->cr_prison = &prison0; 492 #ifdef AUDIT 493 audit_cred_kproc0(p->p_ucred); 494 #endif 495 #ifdef MAC 496 mac_cred_create_swapper(p->p_ucred); 497 #endif 498 td->td_ucred = crhold(p->p_ucred); 499 500 /* Create sigacts. */ 501 p->p_sigacts = sigacts_alloc(); 502 503 /* Initialize signal state for process 0. */ 504 siginit(&proc0); 505 506 /* Create the file descriptor table. */ 507 p->p_fd = fdinit(NULL); 508 p->p_fdtol = NULL; 509 510 /* Create the limits structures. */ 511 p->p_limit = lim_alloc(); 512 for (i = 0; i < RLIM_NLIMITS; i++) 513 p->p_limit->pl_rlimit[i].rlim_cur = 514 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 515 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 516 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 517 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 518 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 519 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 520 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 521 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 522 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 523 /* Cast to avoid overflow on i386/PAE. */ 524 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 525 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 526 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 527 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 528 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 529 p->p_cpulimit = RLIM_INFINITY; 530 531 p->p_stats = pstats_alloc(); 532 533 /* Allocate a prototype map so we have something to fork. */ 534 pmap_pinit0(vmspace_pmap(&vmspace0)); 535 p->p_vmspace = &vmspace0; 536 vmspace0.vm_refcnt = 1; 537 538 /* 539 * proc0 is not expected to enter usermode, so there is no special 540 * handling for sv_minuser here, like is done for exec_new_vmspace(). 541 */ 542 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 543 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 544 545 /* 546 * Call the init and ctor for the new thread and proc. We wait 547 * to do this until all other structures are fairly sane. 548 */ 549 EVENTHANDLER_INVOKE(process_init, p); 550 EVENTHANDLER_INVOKE(thread_init, td); 551 EVENTHANDLER_INVOKE(process_ctor, p); 552 EVENTHANDLER_INVOKE(thread_ctor, td); 553 554 /* 555 * Charge root for one process. 556 */ 557 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 558 } 559 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 560 561 /* ARGSUSED*/ 562 static void 563 proc0_post(void *dummy __unused) 564 { 565 struct timespec ts; 566 struct proc *p; 567 struct rusage ru; 568 struct thread *td; 569 570 /* 571 * Now we can look at the time, having had a chance to verify the 572 * time from the filesystem. Pretend that proc0 started now. 573 */ 574 sx_slock(&allproc_lock); 575 FOREACH_PROC_IN_SYSTEM(p) { 576 microuptime(&p->p_stats->p_start); 577 PROC_SLOCK(p); 578 rufetch(p, &ru); /* Clears thread stats */ 579 PROC_SUNLOCK(p); 580 p->p_rux.rux_runtime = 0; 581 p->p_rux.rux_uticks = 0; 582 p->p_rux.rux_sticks = 0; 583 p->p_rux.rux_iticks = 0; 584 FOREACH_THREAD_IN_PROC(p, td) { 585 td->td_runtime = 0; 586 } 587 } 588 sx_sunlock(&allproc_lock); 589 PCPU_SET(switchtime, cpu_ticks()); 590 PCPU_SET(switchticks, ticks); 591 592 /* 593 * Give the ``random'' number generator a thump. 594 */ 595 nanotime(&ts); 596 srandom(ts.tv_sec ^ ts.tv_nsec); 597 } 598 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 599 600 static void 601 random_init(void *dummy __unused) 602 { 603 604 /* 605 * After CPU has been started we have some randomness on most 606 * platforms via get_cyclecount(). For platforms that don't 607 * we will reseed random(9) in proc0_post() as well. 608 */ 609 srandom(get_cyclecount()); 610 } 611 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 612 613 /* 614 *************************************************************************** 615 **** 616 **** The following SYSINIT's and glue code should be moved to the 617 **** respective files on a per subsystem basis. 618 **** 619 *************************************************************************** 620 */ 621 622 623 /* 624 *************************************************************************** 625 **** 626 **** The following code probably belongs in another file, like 627 **** kern/init_init.c. 628 **** 629 *************************************************************************** 630 */ 631 632 /* 633 * List of paths to try when searching for "init". 634 */ 635 static char init_path[MAXPATHLEN] = 636 #ifdef INIT_PATH 637 __XSTRING(INIT_PATH); 638 #else 639 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 640 #endif 641 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 642 "Path used to search the init process"); 643 644 /* 645 * Shutdown timeout of init(8). 646 * Unused within kernel, but used to control init(8), hence do not remove. 647 */ 648 #ifndef INIT_SHUTDOWN_TIMEOUT 649 #define INIT_SHUTDOWN_TIMEOUT 120 650 #endif 651 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 652 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 653 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 654 "Unused within kernel, but used to control init(8)"); 655 656 /* 657 * Start the initial user process; try exec'ing each pathname in init_path. 658 * The program is invoked with one argument containing the boot flags. 659 */ 660 static void 661 start_init(void *dummy) 662 { 663 vm_offset_t addr; 664 struct execve_args args; 665 int options, error; 666 char *var, *path, *next, *s; 667 char *ucp, **uap, *arg0, *arg1; 668 struct thread *td; 669 struct proc *p; 670 671 mtx_lock(&Giant); 672 673 GIANT_REQUIRED; 674 675 td = curthread; 676 p = td->td_proc; 677 678 vfs_mountroot(); 679 680 /* 681 * Need just enough stack to hold the faked-up "execve()" arguments. 682 */ 683 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 684 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 685 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 686 panic("init: couldn't allocate argument space"); 687 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 688 p->p_vmspace->vm_ssize = 1; 689 690 if ((var = getenv("init_path")) != NULL) { 691 strlcpy(init_path, var, sizeof(init_path)); 692 freeenv(var); 693 } 694 695 for (path = init_path; *path != '\0'; path = next) { 696 while (*path == ':') 697 path++; 698 if (*path == '\0') 699 break; 700 for (next = path; *next != '\0' && *next != ':'; next++) 701 /* nothing */ ; 702 if (bootverbose) 703 printf("start_init: trying %.*s\n", (int)(next - path), 704 path); 705 706 /* 707 * Move out the boot flag argument. 708 */ 709 options = 0; 710 ucp = (char *)p->p_sysent->sv_usrstack; 711 (void)subyte(--ucp, 0); /* trailing zero */ 712 if (boothowto & RB_SINGLE) { 713 (void)subyte(--ucp, 's'); 714 options = 1; 715 } 716 #ifdef notyet 717 if (boothowto & RB_FASTBOOT) { 718 (void)subyte(--ucp, 'f'); 719 options = 1; 720 } 721 #endif 722 723 #ifdef BOOTCDROM 724 (void)subyte(--ucp, 'C'); 725 options = 1; 726 #endif 727 728 if (options == 0) 729 (void)subyte(--ucp, '-'); 730 (void)subyte(--ucp, '-'); /* leading hyphen */ 731 arg1 = ucp; 732 733 /* 734 * Move out the file name (also arg 0). 735 */ 736 (void)subyte(--ucp, 0); 737 for (s = next - 1; s >= path; s--) 738 (void)subyte(--ucp, *s); 739 arg0 = ucp; 740 741 /* 742 * Move out the arg pointers. 743 */ 744 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 745 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 746 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 747 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 748 749 /* 750 * Point at the arguments. 751 */ 752 args.fname = arg0; 753 args.argv = uap; 754 args.envv = NULL; 755 756 /* 757 * Now try to exec the program. If can't for any reason 758 * other than it doesn't exist, complain. 759 * 760 * Otherwise, return via fork_trampoline() all the way 761 * to user mode as init! 762 */ 763 if ((error = execve(td, &args)) == 0) { 764 mtx_unlock(&Giant); 765 return; 766 } 767 if (error != ENOENT) 768 printf("exec %.*s: error %d\n", (int)(next - path), 769 path, error); 770 } 771 printf("init: not found in path %s\n", init_path); 772 panic("no init"); 773 } 774 775 /* 776 * Like kproc_create(), but runs in it's own address space. 777 * We do this early to reserve pid 1. 778 * 779 * Note special case - do not make it runnable yet. Other work 780 * in progress will change this more. 781 */ 782 static void 783 create_init(const void *udata __unused) 784 { 785 struct ucred *newcred, *oldcred; 786 int error; 787 788 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 789 if (error) 790 panic("cannot fork init: %d\n", error); 791 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 792 /* divorce init's credentials from the kernel's */ 793 newcred = crget(); 794 PROC_LOCK(initproc); 795 initproc->p_flag |= P_SYSTEM | P_INMEM; 796 oldcred = initproc->p_ucred; 797 crcopy(newcred, oldcred); 798 #ifdef MAC 799 mac_cred_create_init(newcred); 800 #endif 801 #ifdef AUDIT 802 audit_cred_proc1(newcred); 803 #endif 804 initproc->p_ucred = newcred; 805 PROC_UNLOCK(initproc); 806 crfree(oldcred); 807 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 808 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 809 } 810 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 811 812 /* 813 * Make it runnable now. 814 */ 815 static void 816 kick_init(const void *udata __unused) 817 { 818 struct thread *td; 819 820 td = FIRST_THREAD_IN_PROC(initproc); 821 thread_lock(td); 822 TD_SET_CAN_RUN(td); 823 sched_add(td, SRQ_BORING); 824 thread_unlock(td); 825 } 826 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 827