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_verbose_sysinit.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/loginclass.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/proc.h> 65 #include <sys/racct.h> 66 #include <sys/resourcevar.h> 67 #include <sys/systm.h> 68 #include <sys/signalvar.h> 69 #include <sys/vnode.h> 70 #include <sys/sysent.h> 71 #include <sys/reboot.h> 72 #include <sys/sched.h> 73 #include <sys/sx.h> 74 #include <sys/sysproto.h> 75 #include <sys/vmmeter.h> 76 #include <sys/unistd.h> 77 #include <sys/malloc.h> 78 #include <sys/conf.h> 79 #include <sys/cpuset.h> 80 81 #include <machine/cpu.h> 82 83 #include <security/audit/audit.h> 84 #include <security/mac/mac_framework.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_param.h> 88 #include <vm/pmap.h> 89 #include <vm/vm_map.h> 90 #include <sys/copyright.h> 91 92 #include <ddb/ddb.h> 93 #include <ddb/db_sym.h> 94 95 void mi_startup(void); /* Should be elsewhere */ 96 97 /* Components of the first process -- never freed. */ 98 static struct session session0; 99 static struct pgrp pgrp0; 100 struct proc proc0; 101 struct thread thread0 __aligned(16); 102 struct vmspace vmspace0; 103 struct proc *initproc; 104 105 #ifndef BOOTHOWTO 106 #define BOOTHOWTO 0 107 #endif 108 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 109 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 110 "Boot control flags, passed from loader"); 111 112 #ifndef BOOTVERBOSE 113 #define BOOTVERBOSE 0 114 #endif 115 int bootverbose = BOOTVERBOSE; 116 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 117 "Control the output of verbose kernel messages"); 118 119 /* 120 * This ensures that there is at least one entry so that the sysinit_set 121 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 122 * executed. 123 */ 124 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 125 126 /* 127 * The sysinit table itself. Items are checked off as the are run. 128 * If we want to register new sysinit types, add them to newsysinit. 129 */ 130 SET_DECLARE(sysinit_set, struct sysinit); 131 struct sysinit **sysinit, **sysinit_end; 132 struct sysinit **newsysinit, **newsysinit_end; 133 134 /* 135 * Merge a new sysinit set into the current set, reallocating it if 136 * necessary. This can only be called after malloc is running. 137 */ 138 void 139 sysinit_add(struct sysinit **set, struct sysinit **set_end) 140 { 141 struct sysinit **newset; 142 struct sysinit **sipp; 143 struct sysinit **xipp; 144 int count; 145 146 count = set_end - set; 147 if (newsysinit) 148 count += newsysinit_end - newsysinit; 149 else 150 count += sysinit_end - sysinit; 151 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 152 if (newset == NULL) 153 panic("cannot malloc for sysinit"); 154 xipp = newset; 155 if (newsysinit) 156 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 157 *xipp++ = *sipp; 158 else 159 for (sipp = sysinit; sipp < sysinit_end; sipp++) 160 *xipp++ = *sipp; 161 for (sipp = set; sipp < set_end; sipp++) 162 *xipp++ = *sipp; 163 if (newsysinit) 164 free(newsysinit, M_TEMP); 165 newsysinit = newset; 166 newsysinit_end = newset + count; 167 } 168 169 #if defined (DDB) && defined(VERBOSE_SYSINIT) 170 static const char * 171 symbol_name(vm_offset_t va, db_strategy_t strategy) 172 { 173 const char *name; 174 c_db_sym_t sym; 175 db_expr_t offset; 176 177 if (va == 0) 178 return (NULL); 179 sym = db_search_symbol(va, strategy, &offset); 180 if (offset != 0) 181 return (NULL); 182 db_symbol_values(sym, &name, NULL); 183 return (name); 184 } 185 #endif 186 187 /* 188 * System startup; initialize the world, create process 0, mount root 189 * filesystem, and fork to create init and pagedaemon. Most of the 190 * hard work is done in the lower-level initialization routines including 191 * startup(), which does memory initialization and autoconfiguration. 192 * 193 * This allows simple addition of new kernel subsystems that require 194 * boot time initialization. It also allows substitution of subsystem 195 * (for instance, a scheduler, kernel profiler, or VM system) by object 196 * module. Finally, it allows for optional "kernel threads". 197 */ 198 void 199 mi_startup(void) 200 { 201 202 register struct sysinit **sipp; /* system initialization*/ 203 register struct sysinit **xipp; /* interior loop of sort*/ 204 register struct sysinit *save; /* bubble*/ 205 206 #if defined(VERBOSE_SYSINIT) 207 int last; 208 int verbose; 209 #endif 210 211 if (boothowto & RB_VERBOSE) 212 bootverbose++; 213 214 if (sysinit == NULL) { 215 sysinit = SET_BEGIN(sysinit_set); 216 sysinit_end = SET_LIMIT(sysinit_set); 217 } 218 219 restart: 220 /* 221 * Perform a bubble sort of the system initialization objects by 222 * their subsystem (primary key) and order (secondary key). 223 */ 224 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 225 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 226 if ((*sipp)->subsystem < (*xipp)->subsystem || 227 ((*sipp)->subsystem == (*xipp)->subsystem && 228 (*sipp)->order <= (*xipp)->order)) 229 continue; /* skip*/ 230 save = *sipp; 231 *sipp = *xipp; 232 *xipp = save; 233 } 234 } 235 236 #if defined(VERBOSE_SYSINIT) 237 last = SI_SUB_COPYRIGHT; 238 verbose = 0; 239 #if !defined(DDB) 240 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 241 #endif 242 #endif 243 244 /* 245 * Traverse the (now) ordered list of system initialization tasks. 246 * Perform each task, and continue on to the next task. 247 */ 248 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 249 250 if ((*sipp)->subsystem == SI_SUB_DUMMY) 251 continue; /* skip dummy task(s)*/ 252 253 if ((*sipp)->subsystem == SI_SUB_DONE) 254 continue; 255 256 #if defined(VERBOSE_SYSINIT) 257 if ((*sipp)->subsystem > last) { 258 verbose = 1; 259 last = (*sipp)->subsystem; 260 printf("subsystem %x\n", last); 261 } 262 if (verbose) { 263 #if defined(DDB) 264 const char *func, *data; 265 266 func = symbol_name((vm_offset_t)(*sipp)->func, 267 DB_STGY_PROC); 268 data = symbol_name((vm_offset_t)(*sipp)->udata, 269 DB_STGY_ANY); 270 if (func != NULL && data != NULL) 271 printf(" %s(&%s)... ", func, data); 272 else if (func != NULL) 273 printf(" %s(%p)... ", func, (*sipp)->udata); 274 else 275 #endif 276 printf(" %p(%p)... ", (*sipp)->func, 277 (*sipp)->udata); 278 } 279 #endif 280 281 /* Call function */ 282 (*((*sipp)->func))((*sipp)->udata); 283 284 #if defined(VERBOSE_SYSINIT) 285 if (verbose) 286 printf("done.\n"); 287 #endif 288 289 /* Check off the one we're just done */ 290 (*sipp)->subsystem = SI_SUB_DONE; 291 292 /* Check if we've installed more sysinit items via KLD */ 293 if (newsysinit != NULL) { 294 if (sysinit != SET_BEGIN(sysinit_set)) 295 free(sysinit, M_TEMP); 296 sysinit = newsysinit; 297 sysinit_end = newsysinit_end; 298 newsysinit = NULL; 299 newsysinit_end = NULL; 300 goto restart; 301 } 302 } 303 304 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 305 mtx_unlock(&Giant); 306 307 /* 308 * Now hand over this thread to swapper. 309 */ 310 swapper(); 311 /* NOTREACHED*/ 312 } 313 314 315 /* 316 *************************************************************************** 317 **** 318 **** The following SYSINIT's belong elsewhere, but have not yet 319 **** been moved. 320 **** 321 *************************************************************************** 322 */ 323 static void 324 print_caddr_t(void *data) 325 { 326 printf("%s", (char *)data); 327 } 328 329 static void 330 print_version(void *data __unused) 331 { 332 int len; 333 334 /* Strip a trailing newline from version. */ 335 len = strlen(version); 336 while (len > 0 && version[len - 1] == '\n') 337 len--; 338 printf("%.*s %s\n", len, version, machine); 339 printf("%s\n", compiler_version); 340 } 341 342 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 343 copyright); 344 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 345 trademark); 346 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 347 348 #ifdef WITNESS 349 static char wit_warn[] = 350 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 351 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 352 print_caddr_t, wit_warn); 353 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 354 print_caddr_t, wit_warn); 355 #endif 356 357 #ifdef DIAGNOSTIC 358 static char diag_warn[] = 359 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 360 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 361 print_caddr_t, diag_warn); 362 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 363 print_caddr_t, diag_warn); 364 #endif 365 366 static int 367 null_fetch_syscall_args(struct thread *td __unused, 368 struct syscall_args *sa __unused) 369 { 370 371 panic("null_fetch_syscall_args"); 372 } 373 374 static void 375 null_set_syscall_retval(struct thread *td __unused, int error __unused) 376 { 377 378 panic("null_set_syscall_retval"); 379 } 380 381 struct sysentvec null_sysvec = { 382 .sv_size = 0, 383 .sv_table = NULL, 384 .sv_mask = 0, 385 .sv_sigsize = 0, 386 .sv_sigtbl = NULL, 387 .sv_errsize = 0, 388 .sv_errtbl = NULL, 389 .sv_transtrap = NULL, 390 .sv_fixup = NULL, 391 .sv_sendsig = NULL, 392 .sv_sigcode = NULL, 393 .sv_szsigcode = NULL, 394 .sv_prepsyscall = NULL, 395 .sv_name = "null", 396 .sv_coredump = NULL, 397 .sv_imgact_try = NULL, 398 .sv_minsigstksz = 0, 399 .sv_pagesize = PAGE_SIZE, 400 .sv_minuser = VM_MIN_ADDRESS, 401 .sv_maxuser = VM_MAXUSER_ADDRESS, 402 .sv_usrstack = USRSTACK, 403 .sv_psstrings = PS_STRINGS, 404 .sv_stackprot = VM_PROT_ALL, 405 .sv_copyout_strings = NULL, 406 .sv_setregs = NULL, 407 .sv_fixlimit = NULL, 408 .sv_maxssiz = NULL, 409 .sv_flags = 0, 410 .sv_set_syscall_retval = null_set_syscall_retval, 411 .sv_fetch_syscall_args = null_fetch_syscall_args, 412 .sv_syscallnames = NULL, 413 .sv_schedtail = NULL, 414 }; 415 416 /* 417 *************************************************************************** 418 **** 419 **** The two following SYSINIT's are proc0 specific glue code. I am not 420 **** convinced that they can not be safely combined, but their order of 421 **** operation has been maintained as the same as the original init_main.c 422 **** for right now. 423 **** 424 **** These probably belong in init_proc.c or kern_proc.c, since they 425 **** deal with proc0 (the fork template process). 426 **** 427 *************************************************************************** 428 */ 429 /* ARGSUSED*/ 430 static void 431 proc0_init(void *dummy __unused) 432 { 433 struct proc *p; 434 struct thread *td; 435 vm_paddr_t pageablemem; 436 int i; 437 438 GIANT_REQUIRED; 439 p = &proc0; 440 td = &thread0; 441 442 /* 443 * Initialize magic number and osrel. 444 */ 445 p->p_magic = P_MAGIC; 446 p->p_osrel = osreldate; 447 448 /* 449 * Initialize thread and process structures. 450 */ 451 procinit(); /* set up proc zone */ 452 threadinit(); /* set up UMA zones */ 453 454 /* 455 * Initialise scheduler resources. 456 * Add scheduler specific parts to proc, thread as needed. 457 */ 458 schedinit(); /* scheduler gets its house in order */ 459 460 /* 461 * Create process 0 (the swapper). 462 */ 463 LIST_INSERT_HEAD(&allproc, p, p_list); 464 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 465 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 466 p->p_pgrp = &pgrp0; 467 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 468 LIST_INIT(&pgrp0.pg_members); 469 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 470 471 pgrp0.pg_session = &session0; 472 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 473 refcount_init(&session0.s_count, 1); 474 session0.s_leader = p; 475 476 p->p_sysent = &null_sysvec; 477 p->p_flag = P_SYSTEM | P_INMEM; 478 p->p_flag2 = 0; 479 p->p_state = PRS_NORMAL; 480 knlist_init_mtx(&p->p_klist, &p->p_mtx); 481 STAILQ_INIT(&p->p_ktr); 482 p->p_nice = NZERO; 483 /* pid_max cannot be greater than PID_MAX */ 484 td->td_tid = PID_MAX + 1; 485 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 486 td->td_state = TDS_RUNNING; 487 td->td_pri_class = PRI_TIMESHARE; 488 td->td_user_pri = PUSER; 489 td->td_base_user_pri = PUSER; 490 td->td_lend_user_pri = PRI_MAX; 491 td->td_priority = PVM; 492 td->td_base_pri = PVM; 493 td->td_oncpu = 0; 494 td->td_flags = TDF_INMEM; 495 td->td_pflags = TDP_KTHREAD; 496 td->td_cpuset = cpuset_thread0(); 497 prison0.pr_cpuset = cpuset_ref(td->td_cpuset); 498 p->p_peers = 0; 499 p->p_leader = p; 500 p->p_reaper = p; 501 LIST_INIT(&p->p_reaplist); 502 503 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 504 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 505 506 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 507 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 508 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 509 510 /* Create credentials. */ 511 p->p_ucred = crget(); 512 p->p_ucred->cr_ngroups = 1; /* group 0 */ 513 p->p_ucred->cr_uidinfo = uifind(0); 514 p->p_ucred->cr_ruidinfo = uifind(0); 515 p->p_ucred->cr_prison = &prison0; 516 p->p_ucred->cr_loginclass = loginclass_find("default"); 517 #ifdef AUDIT 518 audit_cred_kproc0(p->p_ucred); 519 #endif 520 #ifdef MAC 521 mac_cred_create_swapper(p->p_ucred); 522 #endif 523 td->td_ucred = crhold(p->p_ucred); 524 525 /* Create sigacts. */ 526 p->p_sigacts = sigacts_alloc(); 527 528 /* Initialize signal state for process 0. */ 529 siginit(&proc0); 530 531 /* Create the file descriptor table. */ 532 p->p_fd = fdinit(NULL, false); 533 p->p_fdtol = NULL; 534 535 /* Create the limits structures. */ 536 p->p_limit = lim_alloc(); 537 for (i = 0; i < RLIM_NLIMITS; i++) 538 p->p_limit->pl_rlimit[i].rlim_cur = 539 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 540 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 541 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 542 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 543 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 544 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 545 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 546 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 547 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 548 /* Cast to avoid overflow on i386/PAE. */ 549 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count); 550 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 551 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 552 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 553 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 554 p->p_cpulimit = RLIM_INFINITY; 555 556 /* Initialize resource accounting structures. */ 557 racct_create(&p->p_racct); 558 559 p->p_stats = pstats_alloc(); 560 561 /* Allocate a prototype map so we have something to fork. */ 562 pmap_pinit0(vmspace_pmap(&vmspace0)); 563 p->p_vmspace = &vmspace0; 564 vmspace0.vm_refcnt = 1; 565 566 /* 567 * proc0 is not expected to enter usermode, so there is no special 568 * handling for sv_minuser here, like is done for exec_new_vmspace(). 569 */ 570 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 571 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 572 573 /* 574 * Call the init and ctor for the new thread and proc. We wait 575 * to do this until all other structures are fairly sane. 576 */ 577 EVENTHANDLER_INVOKE(process_init, p); 578 EVENTHANDLER_INVOKE(thread_init, td); 579 EVENTHANDLER_INVOKE(process_ctor, p); 580 EVENTHANDLER_INVOKE(thread_ctor, td); 581 582 /* 583 * Charge root for one process. 584 */ 585 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 586 PROC_LOCK(p); 587 racct_add_force(p, RACCT_NPROC, 1); 588 PROC_UNLOCK(p); 589 } 590 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 591 592 /* ARGSUSED*/ 593 static void 594 proc0_post(void *dummy __unused) 595 { 596 struct timespec ts; 597 struct proc *p; 598 struct rusage ru; 599 struct thread *td; 600 601 /* 602 * Now we can look at the time, having had a chance to verify the 603 * time from the filesystem. Pretend that proc0 started now. 604 */ 605 sx_slock(&allproc_lock); 606 FOREACH_PROC_IN_SYSTEM(p) { 607 microuptime(&p->p_stats->p_start); 608 PROC_STATLOCK(p); 609 rufetch(p, &ru); /* Clears thread stats */ 610 PROC_STATUNLOCK(p); 611 p->p_rux.rux_runtime = 0; 612 p->p_rux.rux_uticks = 0; 613 p->p_rux.rux_sticks = 0; 614 p->p_rux.rux_iticks = 0; 615 FOREACH_THREAD_IN_PROC(p, td) { 616 td->td_runtime = 0; 617 } 618 } 619 sx_sunlock(&allproc_lock); 620 PCPU_SET(switchtime, cpu_ticks()); 621 PCPU_SET(switchticks, ticks); 622 623 /* 624 * Give the ``random'' number generator a thump. 625 */ 626 nanotime(&ts); 627 srandom(ts.tv_sec ^ ts.tv_nsec); 628 } 629 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 630 631 static void 632 random_init(void *dummy __unused) 633 { 634 635 /* 636 * After CPU has been started we have some randomness on most 637 * platforms via get_cyclecount(). For platforms that don't 638 * we will reseed random(9) in proc0_post() as well. 639 */ 640 srandom(get_cyclecount()); 641 } 642 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 643 644 /* 645 *************************************************************************** 646 **** 647 **** The following SYSINIT's and glue code should be moved to the 648 **** respective files on a per subsystem basis. 649 **** 650 *************************************************************************** 651 */ 652 653 654 /* 655 *************************************************************************** 656 **** 657 **** The following code probably belongs in another file, like 658 **** kern/init_init.c. 659 **** 660 *************************************************************************** 661 */ 662 663 /* 664 * List of paths to try when searching for "init". 665 */ 666 static char init_path[MAXPATHLEN] = 667 #ifdef INIT_PATH 668 __XSTRING(INIT_PATH); 669 #else 670 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 671 #endif 672 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 673 "Path used to search the init process"); 674 675 /* 676 * Shutdown timeout of init(8). 677 * Unused within kernel, but used to control init(8), hence do not remove. 678 */ 679 #ifndef INIT_SHUTDOWN_TIMEOUT 680 #define INIT_SHUTDOWN_TIMEOUT 120 681 #endif 682 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 683 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 684 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 685 "Unused within kernel, but used to control init(8)"); 686 687 /* 688 * Start the initial user process; try exec'ing each pathname in init_path. 689 * The program is invoked with one argument containing the boot flags. 690 */ 691 static void 692 start_init(void *dummy) 693 { 694 vm_offset_t addr; 695 struct execve_args args; 696 int options, error; 697 char *var, *path, *next, *s; 698 char *ucp, **uap, *arg0, *arg1; 699 struct thread *td; 700 struct proc *p; 701 702 mtx_lock(&Giant); 703 704 GIANT_REQUIRED; 705 706 td = curthread; 707 p = td->td_proc; 708 709 vfs_mountroot(); 710 711 /* 712 * Need just enough stack to hold the faked-up "execve()" arguments. 713 */ 714 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 715 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 716 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 717 panic("init: couldn't allocate argument space"); 718 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 719 p->p_vmspace->vm_ssize = 1; 720 721 if ((var = kern_getenv("init_path")) != NULL) { 722 strlcpy(init_path, var, sizeof(init_path)); 723 freeenv(var); 724 } 725 726 for (path = init_path; *path != '\0'; path = next) { 727 while (*path == ':') 728 path++; 729 if (*path == '\0') 730 break; 731 for (next = path; *next != '\0' && *next != ':'; next++) 732 /* nothing */ ; 733 if (bootverbose) 734 printf("start_init: trying %.*s\n", (int)(next - path), 735 path); 736 737 /* 738 * Move out the boot flag argument. 739 */ 740 options = 0; 741 ucp = (char *)p->p_sysent->sv_usrstack; 742 (void)subyte(--ucp, 0); /* trailing zero */ 743 if (boothowto & RB_SINGLE) { 744 (void)subyte(--ucp, 's'); 745 options = 1; 746 } 747 #ifdef notyet 748 if (boothowto & RB_FASTBOOT) { 749 (void)subyte(--ucp, 'f'); 750 options = 1; 751 } 752 #endif 753 754 #ifdef BOOTCDROM 755 (void)subyte(--ucp, 'C'); 756 options = 1; 757 #endif 758 759 if (options == 0) 760 (void)subyte(--ucp, '-'); 761 (void)subyte(--ucp, '-'); /* leading hyphen */ 762 arg1 = ucp; 763 764 /* 765 * Move out the file name (also arg 0). 766 */ 767 (void)subyte(--ucp, 0); 768 for (s = next - 1; s >= path; s--) 769 (void)subyte(--ucp, *s); 770 arg0 = ucp; 771 772 /* 773 * Move out the arg pointers. 774 */ 775 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 776 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 777 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 778 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 779 780 /* 781 * Point at the arguments. 782 */ 783 args.fname = arg0; 784 args.argv = uap; 785 args.envv = NULL; 786 787 /* 788 * Now try to exec the program. If can't for any reason 789 * other than it doesn't exist, complain. 790 * 791 * Otherwise, return via fork_trampoline() all the way 792 * to user mode as init! 793 */ 794 if ((error = sys_execve(td, &args)) == 0) { 795 mtx_unlock(&Giant); 796 return; 797 } 798 if (error != ENOENT) 799 printf("exec %.*s: error %d\n", (int)(next - path), 800 path, error); 801 } 802 printf("init: not found in path %s\n", init_path); 803 panic("no init"); 804 } 805 806 /* 807 * Like kproc_create(), but runs in it's own address space. 808 * We do this early to reserve pid 1. 809 * 810 * Note special case - do not make it runnable yet. Other work 811 * in progress will change this more. 812 */ 813 static void 814 create_init(const void *udata __unused) 815 { 816 struct ucred *newcred, *oldcred; 817 int error; 818 819 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 820 NULL, 0); 821 if (error) 822 panic("cannot fork init: %d\n", error); 823 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 824 /* divorce init's credentials from the kernel's */ 825 newcred = crget(); 826 sx_xlock(&proctree_lock); 827 PROC_LOCK(initproc); 828 initproc->p_flag |= P_SYSTEM | P_INMEM; 829 initproc->p_treeflag |= P_TREE_REAPER; 830 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling); 831 oldcred = initproc->p_ucred; 832 crcopy(newcred, oldcred); 833 #ifdef MAC 834 mac_cred_create_init(newcred); 835 #endif 836 #ifdef AUDIT 837 audit_cred_proc1(newcred); 838 #endif 839 initproc->p_ucred = newcred; 840 PROC_UNLOCK(initproc); 841 sx_xunlock(&proctree_lock); 842 crfree(oldcred); 843 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 844 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 845 } 846 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 847 848 /* 849 * Make it runnable now. 850 */ 851 static void 852 kick_init(const void *udata __unused) 853 { 854 struct thread *td; 855 856 td = FIRST_THREAD_IN_PROC(initproc); 857 thread_lock(td); 858 TD_SET_CAN_RUN(td); 859 sched_add(td, SRQ_BORING); 860 thread_unlock(td); 861 } 862 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 863