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/loginclass.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/racct.h> 65 #include <sys/resourcevar.h> 66 #include <sys/systm.h> 67 #include <sys/signalvar.h> 68 #include <sys/vnode.h> 69 #include <sys/sysent.h> 70 #include <sys/reboot.h> 71 #include <sys/sched.h> 72 #include <sys/sx.h> 73 #include <sys/sysproto.h> 74 #include <sys/vmmeter.h> 75 #include <sys/unistd.h> 76 #include <sys/malloc.h> 77 #include <sys/conf.h> 78 #include <sys/cpuset.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 "Boot control flags, passed from loader"); 107 int bootverbose; 108 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 109 "Control the output of verbose kernel messages"); 110 111 /* 112 * This ensures that there is at least one entry so that the sysinit_set 113 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 114 * executed. 115 */ 116 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 117 118 /* 119 * The sysinit table itself. Items are checked off as the are run. 120 * If we want to register new sysinit types, add them to newsysinit. 121 */ 122 SET_DECLARE(sysinit_set, struct sysinit); 123 struct sysinit **sysinit, **sysinit_end; 124 struct sysinit **newsysinit, **newsysinit_end; 125 126 /* 127 * Merge a new sysinit set into the current set, reallocating it if 128 * necessary. This can only be called after malloc is running. 129 */ 130 void 131 sysinit_add(struct sysinit **set, struct sysinit **set_end) 132 { 133 struct sysinit **newset; 134 struct sysinit **sipp; 135 struct sysinit **xipp; 136 int count; 137 138 count = set_end - set; 139 if (newsysinit) 140 count += newsysinit_end - newsysinit; 141 else 142 count += sysinit_end - sysinit; 143 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 144 if (newset == NULL) 145 panic("cannot malloc for sysinit"); 146 xipp = newset; 147 if (newsysinit) 148 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 149 *xipp++ = *sipp; 150 else 151 for (sipp = sysinit; sipp < sysinit_end; sipp++) 152 *xipp++ = *sipp; 153 for (sipp = set; sipp < set_end; sipp++) 154 *xipp++ = *sipp; 155 if (newsysinit) 156 free(newsysinit, M_TEMP); 157 newsysinit = newset; 158 newsysinit_end = newset + count; 159 } 160 161 #if defined (DDB) && defined(VERBOSE_SYSINIT) 162 static const char * 163 symbol_name(vm_offset_t va, db_strategy_t strategy) 164 { 165 const char *name; 166 c_db_sym_t sym; 167 db_expr_t offset; 168 169 if (va == 0) 170 return (NULL); 171 sym = db_search_symbol(va, strategy, &offset); 172 if (offset != 0) 173 return (NULL); 174 db_symbol_values(sym, &name, NULL); 175 return (name); 176 } 177 #endif 178 179 /* 180 * System startup; initialize the world, create process 0, mount root 181 * filesystem, and fork to create init and pagedaemon. Most of the 182 * hard work is done in the lower-level initialization routines including 183 * startup(), which does memory initialization and autoconfiguration. 184 * 185 * This allows simple addition of new kernel subsystems that require 186 * boot time initialization. It also allows substitution of subsystem 187 * (for instance, a scheduler, kernel profiler, or VM system) by object 188 * module. Finally, it allows for optional "kernel threads". 189 */ 190 void 191 mi_startup(void) 192 { 193 194 register struct sysinit **sipp; /* system initialization*/ 195 register struct sysinit **xipp; /* interior loop of sort*/ 196 register struct sysinit *save; /* bubble*/ 197 198 #if defined(VERBOSE_SYSINIT) 199 int last; 200 int verbose; 201 #endif 202 203 if (boothowto & RB_VERBOSE) 204 bootverbose++; 205 206 if (sysinit == NULL) { 207 sysinit = SET_BEGIN(sysinit_set); 208 sysinit_end = SET_LIMIT(sysinit_set); 209 } 210 211 restart: 212 /* 213 * Perform a bubble sort of the system initialization objects by 214 * their subsystem (primary key) and order (secondary key). 215 */ 216 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 217 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 218 if ((*sipp)->subsystem < (*xipp)->subsystem || 219 ((*sipp)->subsystem == (*xipp)->subsystem && 220 (*sipp)->order <= (*xipp)->order)) 221 continue; /* skip*/ 222 save = *sipp; 223 *sipp = *xipp; 224 *xipp = save; 225 } 226 } 227 228 #if defined(VERBOSE_SYSINIT) 229 last = SI_SUB_COPYRIGHT; 230 verbose = 0; 231 #if !defined(DDB) 232 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 233 #endif 234 #endif 235 236 /* 237 * Traverse the (now) ordered list of system initialization tasks. 238 * Perform each task, and continue on to the next task. 239 * 240 * The last item on the list is expected to be the scheduler, 241 * which will not return. 242 */ 243 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 244 245 if ((*sipp)->subsystem == SI_SUB_DUMMY) 246 continue; /* skip dummy task(s)*/ 247 248 if ((*sipp)->subsystem == SI_SUB_DONE) 249 continue; 250 251 #if defined(VERBOSE_SYSINIT) 252 if ((*sipp)->subsystem > last) { 253 verbose = 1; 254 last = (*sipp)->subsystem; 255 printf("subsystem %x\n", last); 256 } 257 if (verbose) { 258 #if defined(DDB) 259 const char *func, *data; 260 261 func = symbol_name((vm_offset_t)(*sipp)->func, 262 DB_STGY_PROC); 263 data = symbol_name((vm_offset_t)(*sipp)->udata, 264 DB_STGY_ANY); 265 if (func != NULL && data != NULL) 266 printf(" %s(&%s)... ", func, data); 267 else if (func != NULL) 268 printf(" %s(%p)... ", func, (*sipp)->udata); 269 else 270 #endif 271 printf(" %p(%p)... ", (*sipp)->func, 272 (*sipp)->udata); 273 } 274 #endif 275 276 /* Call function */ 277 (*((*sipp)->func))((*sipp)->udata); 278 279 #if defined(VERBOSE_SYSINIT) 280 if (verbose) 281 printf("done.\n"); 282 #endif 283 284 /* Check off the one we're just done */ 285 (*sipp)->subsystem = SI_SUB_DONE; 286 287 /* Check if we've installed more sysinit items via KLD */ 288 if (newsysinit != NULL) { 289 if (sysinit != SET_BEGIN(sysinit_set)) 290 free(sysinit, M_TEMP); 291 sysinit = newsysinit; 292 sysinit_end = newsysinit_end; 293 newsysinit = NULL; 294 newsysinit_end = NULL; 295 goto restart; 296 } 297 } 298 299 panic("Shouldn't get here!"); 300 /* NOTREACHED*/ 301 } 302 303 304 /* 305 *************************************************************************** 306 **** 307 **** The following SYSINIT's belong elsewhere, but have not yet 308 **** been moved. 309 **** 310 *************************************************************************** 311 */ 312 static void 313 print_caddr_t(void *data) 314 { 315 printf("%s", (char *)data); 316 } 317 318 static void 319 print_version(void *data __unused) 320 { 321 int len; 322 323 /* Strip a trailing newline from version. */ 324 len = strlen(version); 325 while (len > 0 && version[len - 1] == '\n') 326 len--; 327 printf("%.*s %s\n", len, version, machine); 328 printf("%s\n", compiler_version); 329 } 330 331 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 332 copyright); 333 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 334 trademark); 335 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 336 337 #ifdef WITNESS 338 static char wit_warn[] = 339 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 340 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 341 print_caddr_t, wit_warn); 342 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1, 343 print_caddr_t, wit_warn); 344 #endif 345 346 #ifdef DIAGNOSTIC 347 static char diag_warn[] = 348 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 349 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 350 print_caddr_t, diag_warn); 351 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2, 352 print_caddr_t, diag_warn); 353 #endif 354 355 static int 356 null_fetch_syscall_args(struct thread *td __unused, 357 struct syscall_args *sa __unused) 358 { 359 360 panic("null_fetch_syscall_args"); 361 } 362 363 static void 364 null_set_syscall_retval(struct thread *td __unused, int error __unused) 365 { 366 367 panic("null_set_syscall_retval"); 368 } 369 370 struct sysentvec null_sysvec = { 371 .sv_size = 0, 372 .sv_table = NULL, 373 .sv_mask = 0, 374 .sv_sigsize = 0, 375 .sv_sigtbl = NULL, 376 .sv_errsize = 0, 377 .sv_errtbl = NULL, 378 .sv_transtrap = NULL, 379 .sv_fixup = NULL, 380 .sv_sendsig = NULL, 381 .sv_sigcode = NULL, 382 .sv_szsigcode = NULL, 383 .sv_prepsyscall = NULL, 384 .sv_name = "null", 385 .sv_coredump = NULL, 386 .sv_imgact_try = NULL, 387 .sv_minsigstksz = 0, 388 .sv_pagesize = PAGE_SIZE, 389 .sv_minuser = VM_MIN_ADDRESS, 390 .sv_maxuser = VM_MAXUSER_ADDRESS, 391 .sv_usrstack = USRSTACK, 392 .sv_psstrings = PS_STRINGS, 393 .sv_stackprot = VM_PROT_ALL, 394 .sv_copyout_strings = NULL, 395 .sv_setregs = NULL, 396 .sv_fixlimit = NULL, 397 .sv_maxssiz = NULL, 398 .sv_flags = 0, 399 .sv_set_syscall_retval = null_set_syscall_retval, 400 .sv_fetch_syscall_args = null_fetch_syscall_args, 401 .sv_syscallnames = NULL, 402 .sv_schedtail = NULL, 403 }; 404 405 /* 406 *************************************************************************** 407 **** 408 **** The two following SYSINIT's are proc0 specific glue code. I am not 409 **** convinced that they can not be safely combined, but their order of 410 **** operation has been maintained as the same as the original init_main.c 411 **** for right now. 412 **** 413 **** These probably belong in init_proc.c or kern_proc.c, since they 414 **** deal with proc0 (the fork template process). 415 **** 416 *************************************************************************** 417 */ 418 /* ARGSUSED*/ 419 static void 420 proc0_init(void *dummy __unused) 421 { 422 struct proc *p; 423 struct thread *td; 424 vm_paddr_t pageablemem; 425 int i; 426 427 GIANT_REQUIRED; 428 p = &proc0; 429 td = &thread0; 430 431 /* 432 * Initialize magic number and osrel. 433 */ 434 p->p_magic = P_MAGIC; 435 p->p_osrel = osreldate; 436 437 /* 438 * Initialize thread and process structures. 439 */ 440 procinit(); /* set up proc zone */ 441 threadinit(); /* set up UMA zones */ 442 443 /* 444 * Initialise scheduler resources. 445 * Add scheduler specific parts to proc, thread as needed. 446 */ 447 schedinit(); /* scheduler gets its house in order */ 448 /* 449 * Initialize sleep queue hash table 450 */ 451 sleepinit(); 452 453 /* 454 * additional VM structures 455 */ 456 vm_init2(); 457 458 /* 459 * Create process 0 (the swapper). 460 */ 461 LIST_INSERT_HEAD(&allproc, p, p_list); 462 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 463 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 464 p->p_pgrp = &pgrp0; 465 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 466 LIST_INIT(&pgrp0.pg_members); 467 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 468 469 pgrp0.pg_session = &session0; 470 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 471 refcount_init(&session0.s_count, 1); 472 session0.s_leader = p; 473 474 p->p_sysent = &null_sysvec; 475 p->p_flag = P_SYSTEM | P_INMEM; 476 p->p_state = PRS_NORMAL; 477 knlist_init_mtx(&p->p_klist, &p->p_mtx); 478 STAILQ_INIT(&p->p_ktr); 479 p->p_nice = NZERO; 480 /* pid_max cannot be greater than PID_MAX */ 481 td->td_tid = PID_MAX + 1; 482 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 483 td->td_state = TDS_RUNNING; 484 td->td_pri_class = PRI_TIMESHARE; 485 td->td_user_pri = PUSER; 486 td->td_base_user_pri = PUSER; 487 td->td_lend_user_pri = PRI_MAX; 488 td->td_priority = PVM; 489 td->td_base_pri = PVM; 490 td->td_oncpu = 0; 491 td->td_flags = TDF_INMEM; 492 td->td_pflags = TDP_KTHREAD; 493 td->td_cpuset = cpuset_thread0(); 494 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 495 p->p_peers = 0; 496 p->p_leader = p; 497 498 499 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 500 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 501 502 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 503 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 504 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 505 506 /* Create credentials. */ 507 p->p_ucred = crget(); 508 p->p_ucred->cr_ngroups = 1; /* group 0 */ 509 p->p_ucred->cr_uidinfo = uifind(0); 510 p->p_ucred->cr_ruidinfo = uifind(0); 511 p->p_ucred->cr_prison = &prison0; 512 p->p_ucred->cr_loginclass = loginclass_find("default"); 513 #ifdef AUDIT 514 audit_cred_kproc0(p->p_ucred); 515 #endif 516 #ifdef MAC 517 mac_cred_create_swapper(p->p_ucred); 518 #endif 519 td->td_ucred = crhold(p->p_ucred); 520 521 /* Create sigacts. */ 522 p->p_sigacts = sigacts_alloc(); 523 524 /* Initialize signal state for process 0. */ 525 siginit(&proc0); 526 527 /* Create the file descriptor table. */ 528 p->p_fd = fdinit(NULL); 529 p->p_fdtol = NULL; 530 531 /* Create the limits structures. */ 532 p->p_limit = lim_alloc(); 533 for (i = 0; i < RLIM_NLIMITS; i++) 534 p->p_limit->pl_rlimit[i].rlim_cur = 535 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 536 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 537 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 538 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 539 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 540 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 541 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 542 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 543 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 544 /* Cast to avoid overflow on i386/PAE. */ 545 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 546 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 547 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 548 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 549 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 550 p->p_cpulimit = RLIM_INFINITY; 551 552 /* Initialize resource accounting structures. */ 553 racct_create(&p->p_racct); 554 555 p->p_stats = pstats_alloc(); 556 557 /* Allocate a prototype map so we have something to fork. */ 558 pmap_pinit0(vmspace_pmap(&vmspace0)); 559 p->p_vmspace = &vmspace0; 560 vmspace0.vm_refcnt = 1; 561 562 /* 563 * proc0 is not expected to enter usermode, so there is no special 564 * handling for sv_minuser here, like is done for exec_new_vmspace(). 565 */ 566 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 567 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 568 569 /* 570 * Call the init and ctor for the new thread and proc. We wait 571 * to do this until all other structures are fairly sane. 572 */ 573 EVENTHANDLER_INVOKE(process_init, p); 574 EVENTHANDLER_INVOKE(thread_init, td); 575 EVENTHANDLER_INVOKE(process_ctor, p); 576 EVENTHANDLER_INVOKE(thread_ctor, td); 577 578 /* 579 * Charge root for one process. 580 */ 581 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 582 PROC_LOCK(p); 583 racct_add_force(p, RACCT_NPROC, 1); 584 PROC_UNLOCK(p); 585 } 586 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 587 588 /* ARGSUSED*/ 589 static void 590 proc0_post(void *dummy __unused) 591 { 592 struct timespec ts; 593 struct proc *p; 594 struct rusage ru; 595 struct thread *td; 596 597 /* 598 * Now we can look at the time, having had a chance to verify the 599 * time from the filesystem. Pretend that proc0 started now. 600 */ 601 sx_slock(&allproc_lock); 602 FOREACH_PROC_IN_SYSTEM(p) { 603 microuptime(&p->p_stats->p_start); 604 PROC_SLOCK(p); 605 rufetch(p, &ru); /* Clears thread stats */ 606 PROC_SUNLOCK(p); 607 p->p_rux.rux_runtime = 0; 608 p->p_rux.rux_uticks = 0; 609 p->p_rux.rux_sticks = 0; 610 p->p_rux.rux_iticks = 0; 611 FOREACH_THREAD_IN_PROC(p, td) { 612 td->td_runtime = 0; 613 } 614 } 615 sx_sunlock(&allproc_lock); 616 PCPU_SET(switchtime, cpu_ticks()); 617 PCPU_SET(switchticks, ticks); 618 619 /* 620 * Give the ``random'' number generator a thump. 621 */ 622 nanotime(&ts); 623 srandom(ts.tv_sec ^ ts.tv_nsec); 624 } 625 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 626 627 static void 628 random_init(void *dummy __unused) 629 { 630 631 /* 632 * After CPU has been started we have some randomness on most 633 * platforms via get_cyclecount(). For platforms that don't 634 * we will reseed random(9) in proc0_post() as well. 635 */ 636 srandom(get_cyclecount()); 637 } 638 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 639 640 /* 641 *************************************************************************** 642 **** 643 **** The following SYSINIT's and glue code should be moved to the 644 **** respective files on a per subsystem basis. 645 **** 646 *************************************************************************** 647 */ 648 649 650 /* 651 *************************************************************************** 652 **** 653 **** The following code probably belongs in another file, like 654 **** kern/init_init.c. 655 **** 656 *************************************************************************** 657 */ 658 659 /* 660 * List of paths to try when searching for "init". 661 */ 662 static char init_path[MAXPATHLEN] = 663 #ifdef INIT_PATH 664 __XSTRING(INIT_PATH); 665 #else 666 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 667 #endif 668 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 669 "Path used to search the init process"); 670 671 /* 672 * Shutdown timeout of init(8). 673 * Unused within kernel, but used to control init(8), hence do not remove. 674 */ 675 #ifndef INIT_SHUTDOWN_TIMEOUT 676 #define INIT_SHUTDOWN_TIMEOUT 120 677 #endif 678 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 679 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 680 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 681 "Unused within kernel, but used to control init(8)"); 682 683 /* 684 * Start the initial user process; try exec'ing each pathname in init_path. 685 * The program is invoked with one argument containing the boot flags. 686 */ 687 static void 688 start_init(void *dummy) 689 { 690 vm_offset_t addr; 691 struct execve_args args; 692 int options, error; 693 char *var, *path, *next, *s; 694 char *ucp, **uap, *arg0, *arg1; 695 struct thread *td; 696 struct proc *p; 697 698 mtx_lock(&Giant); 699 700 GIANT_REQUIRED; 701 702 td = curthread; 703 p = td->td_proc; 704 705 vfs_mountroot(); 706 707 /* 708 * Need just enough stack to hold the faked-up "execve()" arguments. 709 */ 710 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 711 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 712 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 713 panic("init: couldn't allocate argument space"); 714 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 715 p->p_vmspace->vm_ssize = 1; 716 717 if ((var = getenv("init_path")) != NULL) { 718 strlcpy(init_path, var, sizeof(init_path)); 719 freeenv(var); 720 } 721 722 for (path = init_path; *path != '\0'; path = next) { 723 while (*path == ':') 724 path++; 725 if (*path == '\0') 726 break; 727 for (next = path; *next != '\0' && *next != ':'; next++) 728 /* nothing */ ; 729 if (bootverbose) 730 printf("start_init: trying %.*s\n", (int)(next - path), 731 path); 732 733 /* 734 * Move out the boot flag argument. 735 */ 736 options = 0; 737 ucp = (char *)p->p_sysent->sv_usrstack; 738 (void)subyte(--ucp, 0); /* trailing zero */ 739 if (boothowto & RB_SINGLE) { 740 (void)subyte(--ucp, 's'); 741 options = 1; 742 } 743 #ifdef notyet 744 if (boothowto & RB_FASTBOOT) { 745 (void)subyte(--ucp, 'f'); 746 options = 1; 747 } 748 #endif 749 750 #ifdef BOOTCDROM 751 (void)subyte(--ucp, 'C'); 752 options = 1; 753 #endif 754 755 if (options == 0) 756 (void)subyte(--ucp, '-'); 757 (void)subyte(--ucp, '-'); /* leading hyphen */ 758 arg1 = ucp; 759 760 /* 761 * Move out the file name (also arg 0). 762 */ 763 (void)subyte(--ucp, 0); 764 for (s = next - 1; s >= path; s--) 765 (void)subyte(--ucp, *s); 766 arg0 = ucp; 767 768 /* 769 * Move out the arg pointers. 770 */ 771 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 772 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 773 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 774 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 775 776 /* 777 * Point at the arguments. 778 */ 779 args.fname = arg0; 780 args.argv = uap; 781 args.envv = NULL; 782 783 /* 784 * Now try to exec the program. If can't for any reason 785 * other than it doesn't exist, complain. 786 * 787 * Otherwise, return via fork_trampoline() all the way 788 * to user mode as init! 789 */ 790 if ((error = sys_execve(td, &args)) == 0) { 791 mtx_unlock(&Giant); 792 return; 793 } 794 if (error != ENOENT) 795 printf("exec %.*s: error %d\n", (int)(next - path), 796 path, error); 797 } 798 printf("init: not found in path %s\n", init_path); 799 panic("no init"); 800 } 801 802 /* 803 * Like kproc_create(), but runs in it's own address space. 804 * We do this early to reserve pid 1. 805 * 806 * Note special case - do not make it runnable yet. Other work 807 * in progress will change this more. 808 */ 809 static void 810 create_init(const void *udata __unused) 811 { 812 struct ucred *newcred, *oldcred; 813 int error; 814 815 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 816 NULL, 0); 817 if (error) 818 panic("cannot fork init: %d\n", error); 819 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 820 /* divorce init's credentials from the kernel's */ 821 newcred = crget(); 822 PROC_LOCK(initproc); 823 initproc->p_flag |= P_SYSTEM | P_INMEM; 824 oldcred = initproc->p_ucred; 825 crcopy(newcred, oldcred); 826 #ifdef MAC 827 mac_cred_create_init(newcred); 828 #endif 829 #ifdef AUDIT 830 audit_cred_proc1(newcred); 831 #endif 832 initproc->p_ucred = newcred; 833 PROC_UNLOCK(initproc); 834 crfree(oldcred); 835 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 836 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 837 } 838 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 839 840 /* 841 * Make it runnable now. 842 */ 843 static void 844 kick_init(const void *udata __unused) 845 { 846 struct thread *td; 847 848 td = FIRST_THREAD_IN_PROC(initproc); 849 thread_lock(td); 850 TD_SET_CAN_RUN(td); 851 sched_add(td, SRQ_BORING); 852 thread_unlock(td); 853 } 854 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 855