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