init_main.c revision 293473
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: stable/10/sys/kern/init_main.c 293473 2016-01-09 14:08:10Z dchagin $"); 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 94void mi_startup(void); /* Should be elsewhere */ 95 96/* Components of the first process -- never freed. */ 97static struct session session0; 98static struct pgrp pgrp0; 99struct proc proc0; 100struct thread thread0 __aligned(16); 101struct vmspace vmspace0; 102struct proc *initproc; 103 104#ifndef BOOTHOWTO 105#define BOOTHOWTO 0 106#endif 107int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 108SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 109 "Boot control flags, passed from loader"); 110 111#ifndef BOOTVERBOSE 112#define BOOTVERBOSE 0 113#endif 114int bootverbose = BOOTVERBOSE; 115SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 116 "Control the output of verbose kernel messages"); 117 118#ifdef INVARIANTS 119FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 120#endif 121 122/* 123 * This ensures that there is at least one entry so that the sysinit_set 124 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 125 * executed. 126 */ 127SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 128 129/* 130 * The sysinit table itself. Items are checked off as the are run. 131 * If we want to register new sysinit types, add them to newsysinit. 132 */ 133SET_DECLARE(sysinit_set, struct sysinit); 134struct sysinit **sysinit, **sysinit_end; 135struct sysinit **newsysinit, **newsysinit_end; 136 137/* 138 * Merge a new sysinit set into the current set, reallocating it if 139 * necessary. This can only be called after malloc is running. 140 */ 141void 142sysinit_add(struct sysinit **set, struct sysinit **set_end) 143{ 144 struct sysinit **newset; 145 struct sysinit **sipp; 146 struct sysinit **xipp; 147 int count; 148 149 count = set_end - set; 150 if (newsysinit) 151 count += newsysinit_end - newsysinit; 152 else 153 count += sysinit_end - sysinit; 154 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 155 if (newset == NULL) 156 panic("cannot malloc for sysinit"); 157 xipp = newset; 158 if (newsysinit) 159 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 160 *xipp++ = *sipp; 161 else 162 for (sipp = sysinit; sipp < sysinit_end; sipp++) 163 *xipp++ = *sipp; 164 for (sipp = set; sipp < set_end; sipp++) 165 *xipp++ = *sipp; 166 if (newsysinit) 167 free(newsysinit, M_TEMP); 168 newsysinit = newset; 169 newsysinit_end = newset + count; 170} 171 172#if defined (DDB) && defined(VERBOSE_SYSINIT) 173static const char * 174symbol_name(vm_offset_t va, db_strategy_t strategy) 175{ 176 const char *name; 177 c_db_sym_t sym; 178 db_expr_t offset; 179 180 if (va == 0) 181 return (NULL); 182 sym = db_search_symbol(va, strategy, &offset); 183 if (offset != 0) 184 return (NULL); 185 db_symbol_values(sym, &name, NULL); 186 return (name); 187} 188#endif 189 190/* 191 * System startup; initialize the world, create process 0, mount root 192 * filesystem, and fork to create init and pagedaemon. Most of the 193 * hard work is done in the lower-level initialization routines including 194 * startup(), which does memory initialization and autoconfiguration. 195 * 196 * This allows simple addition of new kernel subsystems that require 197 * boot time initialization. It also allows substitution of subsystem 198 * (for instance, a scheduler, kernel profiler, or VM system) by object 199 * module. Finally, it allows for optional "kernel threads". 200 */ 201void 202mi_startup(void) 203{ 204 205 register struct sysinit **sipp; /* system initialization*/ 206 register struct sysinit **xipp; /* interior loop of sort*/ 207 register struct sysinit *save; /* bubble*/ 208 209#if defined(VERBOSE_SYSINIT) 210 int last; 211 int verbose; 212#endif 213 214 if (boothowto & RB_VERBOSE) 215 bootverbose++; 216 217 if (sysinit == NULL) { 218 sysinit = SET_BEGIN(sysinit_set); 219 sysinit_end = SET_LIMIT(sysinit_set); 220 } 221 222restart: 223 /* 224 * Perform a bubble sort of the system initialization objects by 225 * their subsystem (primary key) and order (secondary key). 226 */ 227 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 228 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 229 if ((*sipp)->subsystem < (*xipp)->subsystem || 230 ((*sipp)->subsystem == (*xipp)->subsystem && 231 (*sipp)->order <= (*xipp)->order)) 232 continue; /* skip*/ 233 save = *sipp; 234 *sipp = *xipp; 235 *xipp = save; 236 } 237 } 238 239#if defined(VERBOSE_SYSINIT) 240 last = SI_SUB_COPYRIGHT; 241 verbose = 0; 242#if !defined(DDB) 243 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 244#endif 245#endif 246 247 /* 248 * Traverse the (now) ordered list of system initialization tasks. 249 * Perform each task, and continue on to the next task. 250 */ 251 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 252 253 if ((*sipp)->subsystem == SI_SUB_DUMMY) 254 continue; /* skip dummy task(s)*/ 255 256 if ((*sipp)->subsystem == SI_SUB_DONE) 257 continue; 258 259#if defined(VERBOSE_SYSINIT) 260 if ((*sipp)->subsystem > last) { 261 verbose = 1; 262 last = (*sipp)->subsystem; 263 printf("subsystem %x\n", last); 264 } 265 if (verbose) { 266#if defined(DDB) 267 const char *func, *data; 268 269 func = symbol_name((vm_offset_t)(*sipp)->func, 270 DB_STGY_PROC); 271 data = symbol_name((vm_offset_t)(*sipp)->udata, 272 DB_STGY_ANY); 273 if (func != NULL && data != NULL) 274 printf(" %s(&%s)... ", func, data); 275 else if (func != NULL) 276 printf(" %s(%p)... ", func, (*sipp)->udata); 277 else 278#endif 279 printf(" %p(%p)... ", (*sipp)->func, 280 (*sipp)->udata); 281 } 282#endif 283 284 /* Call function */ 285 (*((*sipp)->func))((*sipp)->udata); 286 287#if defined(VERBOSE_SYSINIT) 288 if (verbose) 289 printf("done.\n"); 290#endif 291 292 /* Check off the one we're just done */ 293 (*sipp)->subsystem = SI_SUB_DONE; 294 295 /* Check if we've installed more sysinit items via KLD */ 296 if (newsysinit != NULL) { 297 if (sysinit != SET_BEGIN(sysinit_set)) 298 free(sysinit, M_TEMP); 299 sysinit = newsysinit; 300 sysinit_end = newsysinit_end; 301 newsysinit = NULL; 302 newsysinit_end = NULL; 303 goto restart; 304 } 305 } 306 307 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 308 mtx_unlock(&Giant); 309 310 /* 311 * Now hand over this thread to swapper. 312 */ 313 swapper(); 314 /* NOTREACHED*/ 315} 316 317 318/* 319 *************************************************************************** 320 **** 321 **** The following SYSINIT's belong elsewhere, but have not yet 322 **** been moved. 323 **** 324 *************************************************************************** 325 */ 326static void 327print_caddr_t(void *data) 328{ 329 printf("%s", (char *)data); 330} 331 332static void 333print_version(void *data __unused) 334{ 335 int len; 336 337 /* Strip a trailing newline from version. */ 338 len = strlen(version); 339 while (len > 0 && version[len - 1] == '\n') 340 len--; 341 printf("%.*s %s\n", len, version, machine); 342 printf("%s\n", compiler_version); 343} 344 345SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 346 copyright); 347SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 348 trademark); 349SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 350 351#ifdef WITNESS 352static char wit_warn[] = 353 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 354SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 355 print_caddr_t, wit_warn); 356SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 357 print_caddr_t, wit_warn); 358#endif 359 360#ifdef DIAGNOSTIC 361static char diag_warn[] = 362 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 363SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 364 print_caddr_t, diag_warn); 365SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 366 print_caddr_t, diag_warn); 367#endif 368 369static int 370null_fetch_syscall_args(struct thread *td __unused, 371 struct syscall_args *sa __unused) 372{ 373 374 panic("null_fetch_syscall_args"); 375} 376 377static void 378null_set_syscall_retval(struct thread *td __unused, int error __unused) 379{ 380 381 panic("null_set_syscall_retval"); 382} 383 384struct sysentvec null_sysvec = { 385 .sv_size = 0, 386 .sv_table = NULL, 387 .sv_mask = 0, 388 .sv_sigsize = 0, 389 .sv_sigtbl = NULL, 390 .sv_errsize = 0, 391 .sv_errtbl = NULL, 392 .sv_transtrap = NULL, 393 .sv_fixup = NULL, 394 .sv_sendsig = NULL, 395 .sv_sigcode = NULL, 396 .sv_szsigcode = NULL, 397 .sv_prepsyscall = NULL, 398 .sv_name = "null", 399 .sv_coredump = NULL, 400 .sv_imgact_try = NULL, 401 .sv_minsigstksz = 0, 402 .sv_pagesize = PAGE_SIZE, 403 .sv_minuser = VM_MIN_ADDRESS, 404 .sv_maxuser = VM_MAXUSER_ADDRESS, 405 .sv_usrstack = USRSTACK, 406 .sv_psstrings = PS_STRINGS, 407 .sv_stackprot = VM_PROT_ALL, 408 .sv_copyout_strings = NULL, 409 .sv_setregs = NULL, 410 .sv_fixlimit = NULL, 411 .sv_maxssiz = NULL, 412 .sv_flags = 0, 413 .sv_set_syscall_retval = null_set_syscall_retval, 414 .sv_fetch_syscall_args = null_fetch_syscall_args, 415 .sv_syscallnames = NULL, 416 .sv_schedtail = NULL, 417}; 418 419/* 420 *************************************************************************** 421 **** 422 **** The two following SYSINIT's are proc0 specific glue code. I am not 423 **** convinced that they can not be safely combined, but their order of 424 **** operation has been maintained as the same as the original init_main.c 425 **** for right now. 426 **** 427 **** These probably belong in init_proc.c or kern_proc.c, since they 428 **** deal with proc0 (the fork template process). 429 **** 430 *************************************************************************** 431 */ 432/* ARGSUSED*/ 433static void 434proc0_init(void *dummy __unused) 435{ 436 struct proc *p; 437 struct thread *td; 438 vm_paddr_t pageablemem; 439 int i; 440 441 GIANT_REQUIRED; 442 p = &proc0; 443 td = &thread0; 444 445 /* 446 * Initialize magic number and osrel. 447 */ 448 p->p_magic = P_MAGIC; 449 p->p_osrel = osreldate; 450 451 /* 452 * Initialize thread and process structures. 453 */ 454 procinit(); /* set up proc zone */ 455 threadinit(); /* set up UMA zones */ 456 457 /* 458 * Initialise scheduler resources. 459 * Add scheduler specific parts to proc, thread as needed. 460 */ 461 schedinit(); /* scheduler gets its house in order */ 462 463 /* 464 * Create process 0 (the swapper). 465 */ 466 LIST_INSERT_HEAD(&allproc, p, p_list); 467 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 468 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 469 p->p_pgrp = &pgrp0; 470 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 471 LIST_INIT(&pgrp0.pg_members); 472 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 473 474 pgrp0.pg_session = &session0; 475 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 476 refcount_init(&session0.s_count, 1); 477 session0.s_leader = p; 478 479 p->p_sysent = &null_sysvec; 480 p->p_flag = P_SYSTEM | P_INMEM; 481 p->p_flag2 = 0; 482 p->p_state = PRS_NORMAL; 483 knlist_init_mtx(&p->p_klist, &p->p_mtx); 484 STAILQ_INIT(&p->p_ktr); 485 p->p_nice = NZERO; 486 /* pid_max cannot be greater than PID_MAX */ 487 td->td_tid = PID_MAX + 1; 488 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 489 td->td_state = TDS_RUNNING; 490 td->td_pri_class = PRI_TIMESHARE; 491 td->td_user_pri = PUSER; 492 td->td_base_user_pri = PUSER; 493 td->td_lend_user_pri = PRI_MAX; 494 td->td_priority = PVM; 495 td->td_base_pri = PVM; 496 td->td_oncpu = 0; 497 td->td_flags = TDF_INMEM; 498 td->td_pflags = TDP_KTHREAD; 499 td->td_cpuset = cpuset_thread0(); 500 prison0_init(); 501 p->p_peers = 0; 502 p->p_leader = p; 503 p->p_reaper = p; 504 LIST_INIT(&p->p_reaplist); 505 506 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 507 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 508 509 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 510 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 511 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 512 513 /* Create credentials. */ 514 p->p_ucred = crget(); 515 p->p_ucred->cr_ngroups = 1; /* group 0 */ 516 p->p_ucred->cr_uidinfo = uifind(0); 517 p->p_ucred->cr_ruidinfo = uifind(0); 518 p->p_ucred->cr_prison = &prison0; 519 p->p_ucred->cr_loginclass = loginclass_find("default"); 520#ifdef AUDIT 521 audit_cred_kproc0(p->p_ucred); 522#endif 523#ifdef MAC 524 mac_cred_create_swapper(p->p_ucred); 525#endif 526 td->td_ucred = crhold(p->p_ucred); 527 528 /* Create sigacts. */ 529 p->p_sigacts = sigacts_alloc(); 530 531 /* Initialize signal state for process 0. */ 532 siginit(&proc0); 533 534 /* Create the file descriptor table. */ 535 p->p_fd = fdinit(NULL); 536 p->p_fdtol = NULL; 537 538 /* Create the limits structures. */ 539 p->p_limit = lim_alloc(); 540 for (i = 0; i < RLIM_NLIMITS; i++) 541 p->p_limit->pl_rlimit[i].rlim_cur = 542 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 543 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 544 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 545 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 546 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 547 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 548 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 549 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 550 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 551 /* Cast to avoid overflow on i386/PAE. */ 552 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 553 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 554 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 555 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 556 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 557 p->p_cpulimit = RLIM_INFINITY; 558 559 /* Initialize resource accounting structures. */ 560 racct_create(&p->p_racct); 561 562 p->p_stats = pstats_alloc(); 563 564 /* Allocate a prototype map so we have something to fork. */ 565 pmap_pinit0(vmspace_pmap(&vmspace0)); 566 p->p_vmspace = &vmspace0; 567 vmspace0.vm_refcnt = 1; 568 569 /* 570 * proc0 is not expected to enter usermode, so there is no special 571 * handling for sv_minuser here, like is done for exec_new_vmspace(). 572 */ 573 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 574 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 575 576 /* 577 * Call the init and ctor for the new thread and proc. We wait 578 * to do this until all other structures are fairly sane. 579 */ 580 EVENTHANDLER_INVOKE(process_init, p); 581 EVENTHANDLER_INVOKE(thread_init, td); 582 EVENTHANDLER_INVOKE(process_ctor, p); 583 EVENTHANDLER_INVOKE(thread_ctor, td); 584 585 /* 586 * Charge root for one process. 587 */ 588 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 589 PROC_LOCK(p); 590 racct_add_force(p, RACCT_NPROC, 1); 591 PROC_UNLOCK(p); 592} 593SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 594 595/* ARGSUSED*/ 596static void 597proc0_post(void *dummy __unused) 598{ 599 struct timespec ts; 600 struct proc *p; 601 struct rusage ru; 602 struct thread *td; 603 604 /* 605 * Now we can look at the time, having had a chance to verify the 606 * time from the filesystem. Pretend that proc0 started now. 607 */ 608 sx_slock(&allproc_lock); 609 FOREACH_PROC_IN_SYSTEM(p) { 610 microuptime(&p->p_stats->p_start); 611 PROC_STATLOCK(p); 612 rufetch(p, &ru); /* Clears thread stats */ 613 PROC_STATUNLOCK(p); 614 p->p_rux.rux_runtime = 0; 615 p->p_rux.rux_uticks = 0; 616 p->p_rux.rux_sticks = 0; 617 p->p_rux.rux_iticks = 0; 618 FOREACH_THREAD_IN_PROC(p, td) { 619 td->td_runtime = 0; 620 } 621 } 622 sx_sunlock(&allproc_lock); 623 PCPU_SET(switchtime, cpu_ticks()); 624 PCPU_SET(switchticks, ticks); 625 626 /* 627 * Give the ``random'' number generator a thump. 628 */ 629 nanotime(&ts); 630 srandom(ts.tv_sec ^ ts.tv_nsec); 631} 632SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 633 634static void 635random_init(void *dummy __unused) 636{ 637 638 /* 639 * After CPU has been started we have some randomness on most 640 * platforms via get_cyclecount(). For platforms that don't 641 * we will reseed random(9) in proc0_post() as well. 642 */ 643 srandom(get_cyclecount()); 644} 645SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 646 647/* 648 *************************************************************************** 649 **** 650 **** The following SYSINIT's and glue code should be moved to the 651 **** respective files on a per subsystem basis. 652 **** 653 *************************************************************************** 654 */ 655 656 657/* 658 *************************************************************************** 659 **** 660 **** The following code probably belongs in another file, like 661 **** kern/init_init.c. 662 **** 663 *************************************************************************** 664 */ 665 666/* 667 * List of paths to try when searching for "init". 668 */ 669static char init_path[MAXPATHLEN] = 670#ifdef INIT_PATH 671 __XSTRING(INIT_PATH); 672#else 673 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 674#endif 675SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 676 "Path used to search the init process"); 677 678/* 679 * Shutdown timeout of init(8). 680 * Unused within kernel, but used to control init(8), hence do not remove. 681 */ 682#ifndef INIT_SHUTDOWN_TIMEOUT 683#define INIT_SHUTDOWN_TIMEOUT 120 684#endif 685static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 686SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 687 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 688 "Unused within kernel, but used to control init(8)"); 689 690/* 691 * Start the initial user process; try exec'ing each pathname in init_path. 692 * The program is invoked with one argument containing the boot flags. 693 */ 694static void 695start_init(void *dummy) 696{ 697 vm_offset_t addr; 698 struct execve_args args; 699 int options, error; 700 char *var, *path, *next, *s; 701 char *ucp, **uap, *arg0, *arg1; 702 struct thread *td; 703 struct proc *p; 704 705 mtx_lock(&Giant); 706 707 GIANT_REQUIRED; 708 709 td = curthread; 710 p = td->td_proc; 711 712 vfs_mountroot(); 713 714 /* Wipe GELI passphrase from the environment. */ 715 unsetenv("kern.geom.eli.passphrase"); 716 717 /* 718 * Need just enough stack to hold the faked-up "execve()" arguments. 719 */ 720 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 721 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 722 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 723 panic("init: couldn't allocate argument space"); 724 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 725 p->p_vmspace->vm_ssize = 1; 726 727 if ((var = getenv("init_path")) != NULL) { 728 strlcpy(init_path, var, sizeof(init_path)); 729 freeenv(var); 730 } 731 732 for (path = init_path; *path != '\0'; path = next) { 733 while (*path == ':') 734 path++; 735 if (*path == '\0') 736 break; 737 for (next = path; *next != '\0' && *next != ':'; next++) 738 /* nothing */ ; 739 if (bootverbose) 740 printf("start_init: trying %.*s\n", (int)(next - path), 741 path); 742 743 /* 744 * Move out the boot flag argument. 745 */ 746 options = 0; 747 ucp = (char *)p->p_sysent->sv_usrstack; 748 (void)subyte(--ucp, 0); /* trailing zero */ 749 if (boothowto & RB_SINGLE) { 750 (void)subyte(--ucp, 's'); 751 options = 1; 752 } 753#ifdef notyet 754 if (boothowto & RB_FASTBOOT) { 755 (void)subyte(--ucp, 'f'); 756 options = 1; 757 } 758#endif 759 760#ifdef BOOTCDROM 761 (void)subyte(--ucp, 'C'); 762 options = 1; 763#endif 764 765 if (options == 0) 766 (void)subyte(--ucp, '-'); 767 (void)subyte(--ucp, '-'); /* leading hyphen */ 768 arg1 = ucp; 769 770 /* 771 * Move out the file name (also arg 0). 772 */ 773 (void)subyte(--ucp, 0); 774 for (s = next - 1; s >= path; s--) 775 (void)subyte(--ucp, *s); 776 arg0 = ucp; 777 778 /* 779 * Move out the arg pointers. 780 */ 781 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 782 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 783 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 784 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 785 786 /* 787 * Point at the arguments. 788 */ 789 args.fname = arg0; 790 args.argv = uap; 791 args.envv = NULL; 792 793 /* 794 * Now try to exec the program. If can't for any reason 795 * other than it doesn't exist, complain. 796 * 797 * Otherwise, return via fork_trampoline() all the way 798 * to user mode as init! 799 */ 800 if ((error = sys_execve(td, &args)) == 0) { 801 mtx_unlock(&Giant); 802 return; 803 } 804 if (error != ENOENT) 805 printf("exec %.*s: error %d\n", (int)(next - path), 806 path, error); 807 } 808 printf("init: not found in path %s\n", init_path); 809 panic("no init"); 810} 811 812/* 813 * Like kproc_create(), but runs in it's own address space. 814 * We do this early to reserve pid 1. 815 * 816 * Note special case - do not make it runnable yet. Other work 817 * in progress will change this more. 818 */ 819static void 820create_init(const void *udata __unused) 821{ 822 struct ucred *newcred, *oldcred; 823 int error; 824 825 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 826 NULL, 0); 827 if (error) 828 panic("cannot fork init: %d\n", error); 829 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 830 /* divorce init's credentials from the kernel's */ 831 newcred = crget(); 832 sx_xlock(&proctree_lock); 833 PROC_LOCK(initproc); 834 initproc->p_flag |= P_SYSTEM | P_INMEM; 835 initproc->p_treeflag |= P_TREE_REAPER; 836 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling); 837 oldcred = initproc->p_ucred; 838 crcopy(newcred, oldcred); 839#ifdef MAC 840 mac_cred_create_init(newcred); 841#endif 842#ifdef AUDIT 843 audit_cred_proc1(newcred); 844#endif 845 initproc->p_ucred = newcred; 846 PROC_UNLOCK(initproc); 847 sx_xunlock(&proctree_lock); 848 crfree(oldcred); 849 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 850 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 851} 852SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 853 854/* 855 * Make it runnable now. 856 */ 857static void 858kick_init(const void *udata __unused) 859{ 860 struct thread *td; 861 862 td = FIRST_THREAD_IN_PROC(initproc); 863 thread_lock(td); 864 TD_SET_CAN_RUN(td); 865 sched_add(td, SRQ_BORING); 866 thread_unlock(td); 867} 868SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 869