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 #include "opt_mac.h" 50 51 #include <sys/param.h> 52 #include <sys/kernel.h> 53 #include <sys/exec.h> 54 #include <sys/file.h> 55 #include <sys/filedesc.h> 56 #include <sys/jail.h> 57 #include <sys/ktr.h> 58 #include <sys/lock.h> 59 #include <sys/mount.h> 60 #include <sys/mutex.h> 61 #include <sys/syscallsubr.h> 62 #include <sys/sysctl.h> 63 #include <sys/proc.h> 64 #include <sys/resourcevar.h> 65 #include <sys/systm.h> 66 #include <sys/signalvar.h> 67 #include <sys/vnode.h> 68 #include <sys/sysent.h> 69 #include <sys/reboot.h> 70 #include <sys/sched.h> 71 #include <sys/sx.h> 72 #include <sys/sysproto.h> 73 #include <sys/vmmeter.h> 74 #include <sys/unistd.h> 75 #include <sys/malloc.h> 76 #include <sys/conf.h> 77 #include <sys/cpuset.h> 78 #include <sys/vimage.h> 79 80 #include <machine/cpu.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_param.h> 87 #include <vm/pmap.h> 88 #include <vm/vm_map.h> 89 #include <sys/copyright.h> 90 91 #include <ddb/ddb.h> 92 #include <ddb/db_sym.h> 93 94 void mi_startup(void); /* Should be elsewhere */ 95 96 /* Components of the first process -- never freed. */ 97 static struct session session0; 98 static struct pgrp pgrp0; 99 struct proc proc0; 100 struct thread thread0 __aligned(16); 101 struct vmspace vmspace0; 102 struct proc *initproc; 103 104 int boothowto = 0; /* initialized so that it can be patched */ 105 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, ""); 106 int bootverbose; 107 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, ""); 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 __unused) 290 { 291 printf("%s", (char *)data); 292 } 293 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 294 copyright); 295 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 296 trademark); 297 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_caddr_t, version); 298 299 #ifdef WITNESS 300 static char wit_warn[] = 301 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 302 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 303 print_caddr_t, wit_warn); 304 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 305 print_caddr_t, wit_warn); 306 #endif 307 308 #ifdef DIAGNOSTIC 309 static char diag_warn[] = 310 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 311 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 312 print_caddr_t, diag_warn); 313 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 314 print_caddr_t, diag_warn); 315 #endif 316 317 static void 318 set_boot_verbose(void *data __unused) 319 { 320 321 if (boothowto & RB_VERBOSE) 322 bootverbose++; 323 } 324 SYSINIT(boot_verbose, SI_SUB_TUNABLES, SI_ORDER_ANY, set_boot_verbose, NULL); 325 326 struct sysentvec null_sysvec = { 327 .sv_size = 0, 328 .sv_table = NULL, 329 .sv_mask = 0, 330 .sv_sigsize = 0, 331 .sv_sigtbl = NULL, 332 .sv_errsize = 0, 333 .sv_errtbl = NULL, 334 .sv_transtrap = NULL, 335 .sv_fixup = NULL, 336 .sv_sendsig = NULL, 337 .sv_sigcode = NULL, 338 .sv_szsigcode = NULL, 339 .sv_prepsyscall = NULL, 340 .sv_name = "null", 341 .sv_coredump = NULL, 342 .sv_imgact_try = NULL, 343 .sv_minsigstksz = 0, 344 .sv_pagesize = PAGE_SIZE, 345 .sv_minuser = VM_MIN_ADDRESS, 346 .sv_maxuser = VM_MAXUSER_ADDRESS, 347 .sv_usrstack = USRSTACK, 348 .sv_psstrings = PS_STRINGS, 349 .sv_stackprot = VM_PROT_ALL, 350 .sv_copyout_strings = NULL, 351 .sv_setregs = NULL, 352 .sv_fixlimit = NULL, 353 .sv_maxssiz = NULL 354 }; 355 356 /* 357 *************************************************************************** 358 **** 359 **** The two following SYSINIT's are proc0 specific glue code. I am not 360 **** convinced that they can not be safely combined, but their order of 361 **** operation has been maintained as the same as the original init_main.c 362 **** for right now. 363 **** 364 **** These probably belong in init_proc.c or kern_proc.c, since they 365 **** deal with proc0 (the fork template process). 366 **** 367 *************************************************************************** 368 */ 369 /* ARGSUSED*/ 370 static void 371 proc0_init(void *dummy __unused) 372 { 373 struct proc *p; 374 unsigned i; 375 struct thread *td; 376 377 GIANT_REQUIRED; 378 p = &proc0; 379 td = &thread0; 380 381 /* 382 * Initialize magic number and osrel. 383 */ 384 p->p_magic = P_MAGIC; 385 p->p_osrel = osreldate; 386 387 /* 388 * Initialize thread and process structures. 389 */ 390 procinit(); /* set up proc zone */ 391 threadinit(); /* set up UMA zones */ 392 393 /* 394 * Initialise scheduler resources. 395 * Add scheduler specific parts to proc, thread as needed. 396 */ 397 schedinit(); /* scheduler gets its house in order */ 398 /* 399 * Initialize sleep queue hash table 400 */ 401 sleepinit(); 402 403 /* 404 * additional VM structures 405 */ 406 vm_init2(); 407 408 /* 409 * Create process 0 (the swapper). 410 */ 411 LIST_INSERT_HEAD(&allproc, p, p_list); 412 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 413 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 414 p->p_pgrp = &pgrp0; 415 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 416 LIST_INIT(&pgrp0.pg_members); 417 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 418 419 pgrp0.pg_session = &session0; 420 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 421 refcount_init(&session0.s_count, 1); 422 session0.s_leader = p; 423 424 p->p_sysent = &null_sysvec; 425 p->p_flag = P_SYSTEM | P_INMEM; 426 p->p_state = PRS_NORMAL; 427 knlist_init(&p->p_klist, &p->p_mtx, NULL, NULL, NULL); 428 STAILQ_INIT(&p->p_ktr); 429 p->p_nice = NZERO; 430 td->td_tid = PID_MAX + 1; 431 td->td_state = TDS_RUNNING; 432 td->td_pri_class = PRI_TIMESHARE; 433 td->td_user_pri = PUSER; 434 td->td_base_user_pri = PUSER; 435 td->td_priority = PVM; 436 td->td_base_pri = PUSER; 437 td->td_oncpu = 0; 438 td->td_flags = TDF_INMEM|TDP_KTHREAD; 439 td->td_cpuset = cpuset_thread0(); 440 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 441 p->p_peers = 0; 442 p->p_leader = p; 443 444 445 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 446 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 447 448 callout_init(&p->p_itcallout, CALLOUT_MPSAFE); 449 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 450 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 451 452 /* Create credentials. */ 453 p->p_ucred = crget(); 454 p->p_ucred->cr_ngroups = 1; /* group 0 */ 455 p->p_ucred->cr_uidinfo = uifind(0); 456 p->p_ucred->cr_ruidinfo = uifind(0); 457 p->p_ucred->cr_prison = &prison0; 458 #ifdef VIMAGE 459 KASSERT(LIST_FIRST(&vimage_head) != NULL, ("vimage_head empty")); 460 P_TO_VIMAGE(p) = LIST_FIRST(&vimage_head); /* set ucred->cr_vimage */ 461 refcount_acquire(&P_TO_VIMAGE(p)->vi_ucredrefc); 462 LIST_FIRST(&vprocg_head)->nprocs++; 463 #endif 464 #ifdef AUDIT 465 audit_cred_kproc0(p->p_ucred); 466 #endif 467 #ifdef MAC 468 mac_cred_create_swapper(p->p_ucred); 469 #endif 470 td->td_ucred = crhold(p->p_ucred); 471 472 /* Create sigacts. */ 473 p->p_sigacts = sigacts_alloc(); 474 475 /* Initialize signal state for process 0. */ 476 siginit(&proc0); 477 478 /* Create the file descriptor table. */ 479 p->p_fd = fdinit(NULL); 480 p->p_fdtol = NULL; 481 482 /* Create the limits structures. */ 483 p->p_limit = lim_alloc(); 484 for (i = 0; i < RLIM_NLIMITS; i++) 485 p->p_limit->pl_rlimit[i].rlim_cur = 486 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 487 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 488 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 489 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 490 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 491 i = ptoa(cnt.v_free_count); 492 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i; 493 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i; 494 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3; 495 p->p_cpulimit = RLIM_INFINITY; 496 497 p->p_stats = pstats_alloc(); 498 499 /* Allocate a prototype map so we have something to fork. */ 500 pmap_pinit0(vmspace_pmap(&vmspace0)); 501 p->p_vmspace = &vmspace0; 502 vmspace0.vm_refcnt = 1; 503 vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser, 504 p->p_sysent->sv_maxuser); 505 vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0); 506 507 /*- 508 * call the init and ctor for the new thread and proc 509 * we wait to do this until all other structures 510 * are fairly sane. 511 */ 512 EVENTHANDLER_INVOKE(process_init, p); 513 EVENTHANDLER_INVOKE(thread_init, td); 514 EVENTHANDLER_INVOKE(process_ctor, p); 515 EVENTHANDLER_INVOKE(thread_ctor, td); 516 517 /* 518 * Charge root for one process. 519 */ 520 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 521 } 522 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 523 524 /* ARGSUSED*/ 525 static void 526 proc0_post(void *dummy __unused) 527 { 528 struct timespec ts; 529 struct proc *p; 530 struct rusage ru; 531 struct thread *td; 532 533 /* 534 * Now we can look at the time, having had a chance to verify the 535 * time from the filesystem. Pretend that proc0 started now. 536 */ 537 sx_slock(&allproc_lock); 538 FOREACH_PROC_IN_SYSTEM(p) { 539 microuptime(&p->p_stats->p_start); 540 PROC_SLOCK(p); 541 rufetch(p, &ru); /* Clears thread stats */ 542 PROC_SUNLOCK(p); 543 p->p_rux.rux_runtime = 0; 544 p->p_rux.rux_uticks = 0; 545 p->p_rux.rux_sticks = 0; 546 p->p_rux.rux_iticks = 0; 547 FOREACH_THREAD_IN_PROC(p, td) { 548 td->td_runtime = 0; 549 } 550 } 551 sx_sunlock(&allproc_lock); 552 PCPU_SET(switchtime, cpu_ticks()); 553 PCPU_SET(switchticks, ticks); 554 555 /* 556 * Give the ``random'' number generator a thump. 557 */ 558 nanotime(&ts); 559 srandom(ts.tv_sec ^ ts.tv_nsec); 560 } 561 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 562 563 /* 564 *************************************************************************** 565 **** 566 **** The following SYSINIT's and glue code should be moved to the 567 **** respective files on a per subsystem basis. 568 **** 569 *************************************************************************** 570 */ 571 572 573 /* 574 *************************************************************************** 575 **** 576 **** The following code probably belongs in another file, like 577 **** kern/init_init.c. 578 **** 579 *************************************************************************** 580 */ 581 582 /* 583 * List of paths to try when searching for "init". 584 */ 585 static char init_path[MAXPATHLEN] = 586 #ifdef INIT_PATH 587 __XSTRING(INIT_PATH); 588 #else 589 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 590 #endif 591 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 592 "Path used to search the init process"); 593 594 /* 595 * Shutdown timeout of init(8). 596 * Unused within kernel, but used to control init(8), hence do not remove. 597 */ 598 #ifndef INIT_SHUTDOWN_TIMEOUT 599 #define INIT_SHUTDOWN_TIMEOUT 120 600 #endif 601 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 602 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 603 CTLFLAG_RW, &init_shutdown_timeout, 0, ""); 604 605 /* 606 * Start the initial user process; try exec'ing each pathname in init_path. 607 * The program is invoked with one argument containing the boot flags. 608 */ 609 static void 610 start_init(void *dummy) 611 { 612 vm_offset_t addr; 613 struct execve_args args; 614 int options, error; 615 char *var, *path, *next, *s; 616 char *ucp, **uap, *arg0, *arg1; 617 struct thread *td; 618 struct proc *p; 619 620 mtx_lock(&Giant); 621 622 GIANT_REQUIRED; 623 624 td = curthread; 625 p = td->td_proc; 626 627 vfs_mountroot(); 628 629 /* 630 * Need just enough stack to hold the faked-up "execve()" arguments. 631 */ 632 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 633 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 634 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 635 panic("init: couldn't allocate argument space"); 636 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 637 p->p_vmspace->vm_ssize = 1; 638 639 if ((var = getenv("init_path")) != NULL) { 640 strlcpy(init_path, var, sizeof(init_path)); 641 freeenv(var); 642 } 643 644 for (path = init_path; *path != '\0'; path = next) { 645 while (*path == ':') 646 path++; 647 if (*path == '\0') 648 break; 649 for (next = path; *next != '\0' && *next != ':'; next++) 650 /* nothing */ ; 651 if (bootverbose) 652 printf("start_init: trying %.*s\n", (int)(next - path), 653 path); 654 655 /* 656 * Move out the boot flag argument. 657 */ 658 options = 0; 659 ucp = (char *)p->p_sysent->sv_usrstack; 660 (void)subyte(--ucp, 0); /* trailing zero */ 661 if (boothowto & RB_SINGLE) { 662 (void)subyte(--ucp, 's'); 663 options = 1; 664 } 665 #ifdef notyet 666 if (boothowto & RB_FASTBOOT) { 667 (void)subyte(--ucp, 'f'); 668 options = 1; 669 } 670 #endif 671 672 #ifdef BOOTCDROM 673 (void)subyte(--ucp, 'C'); 674 options = 1; 675 #endif 676 677 if (options == 0) 678 (void)subyte(--ucp, '-'); 679 (void)subyte(--ucp, '-'); /* leading hyphen */ 680 arg1 = ucp; 681 682 /* 683 * Move out the file name (also arg 0). 684 */ 685 (void)subyte(--ucp, 0); 686 for (s = next - 1; s >= path; s--) 687 (void)subyte(--ucp, *s); 688 arg0 = ucp; 689 690 /* 691 * Move out the arg pointers. 692 */ 693 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 694 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 695 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 696 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 697 698 /* 699 * Point at the arguments. 700 */ 701 args.fname = arg0; 702 args.argv = uap; 703 args.envv = NULL; 704 705 /* 706 * Now try to exec the program. If can't for any reason 707 * other than it doesn't exist, complain. 708 * 709 * Otherwise, return via fork_trampoline() all the way 710 * to user mode as init! 711 */ 712 if ((error = execve(td, &args)) == 0) { 713 mtx_unlock(&Giant); 714 return; 715 } 716 if (error != ENOENT) 717 printf("exec %.*s: error %d\n", (int)(next - path), 718 path, error); 719 } 720 printf("init: not found in path %s\n", init_path); 721 panic("no init"); 722 } 723 724 /* 725 * Like kproc_create(), but runs in it's own address space. 726 * We do this early to reserve pid 1. 727 * 728 * Note special case - do not make it runnable yet. Other work 729 * in progress will change this more. 730 */ 731 static void 732 create_init(const void *udata __unused) 733 { 734 struct ucred *newcred, *oldcred; 735 int error; 736 737 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc); 738 if (error) 739 panic("cannot fork init: %d\n", error); 740 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 741 /* divorce init's credentials from the kernel's */ 742 newcred = crget(); 743 PROC_LOCK(initproc); 744 initproc->p_flag |= P_SYSTEM | P_INMEM; 745 oldcred = initproc->p_ucred; 746 crcopy(newcred, oldcred); 747 #ifdef MAC 748 mac_cred_create_init(newcred); 749 #endif 750 #ifdef AUDIT 751 audit_cred_proc1(newcred); 752 #endif 753 initproc->p_ucred = newcred; 754 PROC_UNLOCK(initproc); 755 crfree(oldcred); 756 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 757 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 758 } 759 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 760 761 /* 762 * Make it runnable now. 763 */ 764 static void 765 kick_init(const void *udata __unused) 766 { 767 struct thread *td; 768 769 td = FIRST_THREAD_IN_PROC(initproc); 770 thread_lock(td); 771 TD_SET_CAN_RUN(td); 772 sched_add(td, SRQ_BORING); 773 thread_unlock(td); 774 } 775 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 776