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 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 104int boothowto = 0; /* initialized so that it can be patched */ 105SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 106 "Boot control flags, passed from loader"); 107int bootverbose; 108SYSCTL_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 */ 116SYSINIT(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 */ 122SET_DECLARE(sysinit_set, struct sysinit); 123struct sysinit **sysinit, **sysinit_end; 124struct 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 */ 130void 131sysinit_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) 162static const char * 163symbol_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 */ 190void 191mi_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 211restart: 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 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 241 242 if ((*sipp)->subsystem == SI_SUB_DUMMY) 243 continue; /* skip dummy task(s)*/ 244 245 if ((*sipp)->subsystem == SI_SUB_DONE) 246 continue; 247 248#if defined(VERBOSE_SYSINIT) 249 if ((*sipp)->subsystem > last) { 250 verbose = 1; 251 last = (*sipp)->subsystem; 252 printf("subsystem %x\n", last); 253 } 254 if (verbose) { 255#if defined(DDB) 256 const char *func, *data; 257 258 func = symbol_name((vm_offset_t)(*sipp)->func, 259 DB_STGY_PROC); 260 data = symbol_name((vm_offset_t)(*sipp)->udata, 261 DB_STGY_ANY); 262 if (func != NULL && data != NULL) 263 printf(" %s(&%s)... ", func, data); 264 else if (func != NULL) 265 printf(" %s(%p)... ", func, (*sipp)->udata); 266 else 267#endif 268 printf(" %p(%p)... ", (*sipp)->func, 269 (*sipp)->udata); 270 } 271#endif 272 273 /* Call function */ 274 (*((*sipp)->func))((*sipp)->udata); 275 276#if defined(VERBOSE_SYSINIT) 277 if (verbose) 278 printf("done.\n"); 279#endif 280 281 /* Check off the one we're just done */ 282 (*sipp)->subsystem = SI_SUB_DONE; 283 284 /* Check if we've installed more sysinit items via KLD */ 285 if (newsysinit != NULL) { 286 if (sysinit != SET_BEGIN(sysinit_set)) 287 free(sysinit, M_TEMP); 288 sysinit = newsysinit; 289 sysinit_end = newsysinit_end; 290 newsysinit = NULL; 291 newsysinit_end = NULL; 292 goto restart; 293 } 294 } 295 296 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 297 mtx_unlock(&Giant); 298 299 /* 300 * Now hand over this thread to swapper. 301 */ 302 swapper(); 303 /* NOTREACHED*/ 304} 305 306 307/* 308 *************************************************************************** 309 **** 310 **** The following SYSINIT's belong elsewhere, but have not yet 311 **** been moved. 312 **** 313 *************************************************************************** 314 */ 315static void 316print_caddr_t(void *data) 317{ 318 printf("%s", (char *)data); 319} 320 321static void 322print_version(void *data __unused) 323{ 324 int len; 325 326 /* Strip a trailing newline from version. */ 327 len = strlen(version); 328 while (len > 0 && version[len - 1] == '\n') 329 len--; 330 printf("%.*s %s\n", len, version, machine); 331 printf("%s\n", compiler_version); 332} 333 334SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 335 copyright); 336SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 337 trademark); 338SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 339 340#ifdef WITNESS 341static char wit_warn[] = 342 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 343SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1, 344 print_caddr_t, wit_warn); 345SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1, 346 print_caddr_t, wit_warn); 347#endif 348 349#ifdef DIAGNOSTIC 350static char diag_warn[] = 351 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 352SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2, 353 print_caddr_t, diag_warn); 354SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2, 355 print_caddr_t, diag_warn); 356#endif 357 358static int 359null_fetch_syscall_args(struct thread *td __unused, 360 struct syscall_args *sa __unused) 361{ 362 363 panic("null_fetch_syscall_args"); 364} 365 366static void 367null_set_syscall_retval(struct thread *td __unused, int error __unused) 368{ 369 370 panic("null_set_syscall_retval"); 371} 372 373struct sysentvec null_sysvec = { 374 .sv_size = 0, 375 .sv_table = NULL, 376 .sv_mask = 0, 377 .sv_sigsize = 0, 378 .sv_sigtbl = NULL, 379 .sv_errsize = 0, 380 .sv_errtbl = NULL, 381 .sv_transtrap = NULL, 382 .sv_fixup = NULL, 383 .sv_sendsig = NULL, 384 .sv_sigcode = NULL, 385 .sv_szsigcode = NULL, 386 .sv_prepsyscall = NULL, 387 .sv_name = "null", 388 .sv_coredump = NULL, 389 .sv_imgact_try = NULL, 390 .sv_minsigstksz = 0, 391 .sv_pagesize = PAGE_SIZE, 392 .sv_minuser = VM_MIN_ADDRESS, 393 .sv_maxuser = VM_MAXUSER_ADDRESS, 394 .sv_usrstack = USRSTACK, 395 .sv_psstrings = PS_STRINGS, 396 .sv_stackprot = VM_PROT_ALL, 397 .sv_copyout_strings = NULL, 398 .sv_setregs = NULL, 399 .sv_fixlimit = NULL, 400 .sv_maxssiz = NULL, 401 .sv_flags = 0, 402 .sv_set_syscall_retval = null_set_syscall_retval, 403 .sv_fetch_syscall_args = null_fetch_syscall_args, 404 .sv_syscallnames = NULL, 405 .sv_schedtail = NULL, 406}; 407 408/* 409 *************************************************************************** 410 **** 411 **** The two following SYSINIT's are proc0 specific glue code. I am not 412 **** convinced that they can not be safely combined, but their order of 413 **** operation has been maintained as the same as the original init_main.c 414 **** for right now. 415 **** 416 **** These probably belong in init_proc.c or kern_proc.c, since they 417 **** deal with proc0 (the fork template process). 418 **** 419 *************************************************************************** 420 */ 421/* ARGSUSED*/ 422static void 423proc0_init(void *dummy __unused) 424{ 425 struct proc *p; 426 struct thread *td; 427 vm_paddr_t pageablemem; 428 int i; 429 430 GIANT_REQUIRED; 431 p = &proc0; 432 td = &thread0; 433 434 /* 435 * Initialize magic number and osrel. 436 */ 437 p->p_magic = P_MAGIC; 438 p->p_osrel = osreldate; 439 440 /* 441 * Initialize thread and process structures. 442 */ 443 procinit(); /* set up proc zone */ 444 threadinit(); /* set up UMA zones */ 445 446 /* 447 * Initialise scheduler resources. 448 * Add scheduler specific parts to proc, thread as needed. 449 */ 450 schedinit(); /* scheduler gets its house in order */ 451 /* 452 * Initialize sleep queue hash table 453 */ 454 sleepinit(); 455 456 /* 457 * additional VM structures 458 */ 459 vm_init2(); 460 461 /* 462 * Create process 0 (the swapper). 463 */ 464 LIST_INSERT_HEAD(&allproc, p, p_list); 465 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 466 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 467 p->p_pgrp = &pgrp0; 468 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 469 LIST_INIT(&pgrp0.pg_members); 470 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 471 472 pgrp0.pg_session = &session0; 473 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 474 refcount_init(&session0.s_count, 1); 475 session0.s_leader = p; 476 477 p->p_sysent = &null_sysvec; 478 p->p_flag = P_SYSTEM | P_INMEM; 479 p->p_flag2 = 0; 480 p->p_state = PRS_NORMAL; 481 knlist_init_mtx(&p->p_klist, &p->p_mtx); 482 STAILQ_INIT(&p->p_ktr); 483 p->p_nice = NZERO; 484 /* pid_max cannot be greater than PID_MAX */ 485 td->td_tid = PID_MAX + 1; 486 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 487 td->td_state = TDS_RUNNING; 488 td->td_pri_class = PRI_TIMESHARE; 489 td->td_user_pri = PUSER; 490 td->td_base_user_pri = PUSER; 491 td->td_lend_user_pri = PRI_MAX; 492 td->td_priority = PVM; 493 td->td_base_pri = PVM; 494 td->td_oncpu = 0; 495 td->td_flags = TDF_INMEM|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; 500 501 502 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 503 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 504 505 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 506 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 507 callout_init(&td->td_slpcallout, CALLOUT_MPSAFE); 508 509 /* Create credentials. */ 510 p->p_ucred = crget(); 511 p->p_ucred->cr_ngroups = 1; /* group 0 */ 512 p->p_ucred->cr_uidinfo = uifind(0); 513 p->p_ucred->cr_ruidinfo = uifind(0); 514 p->p_ucred->cr_prison = &prison0; 515 p->p_ucred->cr_loginclass = loginclass_find("default"); 516#ifdef AUDIT 517 audit_cred_kproc0(p->p_ucred); 518#endif 519#ifdef MAC 520 mac_cred_create_swapper(p->p_ucred); 521#endif 522 td->td_ucred = crhold(p->p_ucred); 523 524 /* Create sigacts. */ 525 p->p_sigacts = sigacts_alloc(); 526 527 /* Initialize signal state for process 0. */ 528 siginit(&proc0); 529 530 /* Create the file descriptor table. */ 531 p->p_fd = fdinit(NULL); 532 p->p_fdtol = NULL; 533 534 /* Create the limits structures. */ 535 p->p_limit = lim_alloc(); 536 for (i = 0; i < RLIM_NLIMITS; i++) 537 p->p_limit->pl_rlimit[i].rlim_cur = 538 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 539 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 540 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 541 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 542 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 543 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 544 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 545 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 546 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 547 /* Cast to avoid overflow on i386/PAE. */ 548 pageablemem = ptoa((vm_paddr_t)cnt.v_free_count); 549 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 550 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 551 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 552 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 553 p->p_cpulimit = RLIM_INFINITY; 554 555 /* Initialize resource accounting structures. */ 556 racct_create(&p->p_racct); 557 558 p->p_stats = pstats_alloc(); 559 560 /* Allocate a prototype map so we have something to fork. */ 561 pmap_pinit0(vmspace_pmap(&vmspace0)); 562 p->p_vmspace = &vmspace0; 563 vmspace0.vm_refcnt = 1; 564 565 /* 566 * proc0 is not expected to enter usermode, so there is no special 567 * handling for sv_minuser here, like is done for exec_new_vmspace(). 568 */ 569 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 570 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 571 572 /* 573 * Call the init and ctor for the new thread and proc. We wait 574 * to do this until all other structures are fairly sane. 575 */ 576 EVENTHANDLER_INVOKE(process_init, p); 577 EVENTHANDLER_INVOKE(thread_init, td); 578 EVENTHANDLER_INVOKE(process_ctor, p); 579 EVENTHANDLER_INVOKE(thread_ctor, td); 580 581 /* 582 * Charge root for one process. 583 */ 584 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 585 PROC_LOCK(p); 586 racct_add_force(p, RACCT_NPROC, 1); 587 PROC_UNLOCK(p); 588} 589SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 590 591/* ARGSUSED*/ 592static void 593proc0_post(void *dummy __unused) 594{ 595 struct timespec ts; 596 struct proc *p; 597 struct rusage ru; 598 struct thread *td; 599 600 /* 601 * Now we can look at the time, having had a chance to verify the 602 * time from the filesystem. Pretend that proc0 started now. 603 */ 604 sx_slock(&allproc_lock); 605 FOREACH_PROC_IN_SYSTEM(p) { 606 microuptime(&p->p_stats->p_start); 607 PROC_SLOCK(p); 608 rufetch(p, &ru); /* Clears thread stats */ 609 PROC_SUNLOCK(p); 610 p->p_rux.rux_runtime = 0; 611 p->p_rux.rux_uticks = 0; 612 p->p_rux.rux_sticks = 0; 613 p->p_rux.rux_iticks = 0; 614 FOREACH_THREAD_IN_PROC(p, td) { 615 td->td_runtime = 0; 616 } 617 } 618 sx_sunlock(&allproc_lock); 619 PCPU_SET(switchtime, cpu_ticks()); 620 PCPU_SET(switchticks, ticks); 621 622 /* 623 * Give the ``random'' number generator a thump. 624 */ 625 nanotime(&ts); 626 srandom(ts.tv_sec ^ ts.tv_nsec); 627} 628SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 629 630static void 631random_init(void *dummy __unused) 632{ 633 634 /* 635 * After CPU has been started we have some randomness on most 636 * platforms via get_cyclecount(). For platforms that don't 637 * we will reseed random(9) in proc0_post() as well. 638 */ 639 srandom(get_cyclecount()); 640} 641SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 642 643/* 644 *************************************************************************** 645 **** 646 **** The following SYSINIT's and glue code should be moved to the 647 **** respective files on a per subsystem basis. 648 **** 649 *************************************************************************** 650 */ 651 652 653/* 654 *************************************************************************** 655 **** 656 **** The following code probably belongs in another file, like 657 **** kern/init_init.c. 658 **** 659 *************************************************************************** 660 */ 661 662/* 663 * List of paths to try when searching for "init". 664 */ 665static char init_path[MAXPATHLEN] = 666#ifdef INIT_PATH 667 __XSTRING(INIT_PATH); 668#else 669 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall"; 670#endif 671SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 672 "Path used to search the init process"); 673 674/* 675 * Shutdown timeout of init(8). 676 * Unused within kernel, but used to control init(8), hence do not remove. 677 */ 678#ifndef INIT_SHUTDOWN_TIMEOUT 679#define INIT_SHUTDOWN_TIMEOUT 120 680#endif 681static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 682SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 683 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 684 "Unused within kernel, but used to control init(8)"); 685 686/* 687 * Start the initial user process; try exec'ing each pathname in init_path. 688 * The program is invoked with one argument containing the boot flags. 689 */ 690static void 691start_init(void *dummy) 692{ 693 vm_offset_t addr; 694 struct execve_args args; 695 int options, error; 696 char *var, *path, *next, *s; 697 char *ucp, **uap, *arg0, *arg1; 698 struct thread *td; 699 struct proc *p; 700 701 mtx_lock(&Giant); 702 703 GIANT_REQUIRED; 704 705 td = curthread; 706 p = td->td_proc; 707 708 vfs_mountroot(); 709 710 /* 711 * Need just enough stack to hold the faked-up "execve()" arguments. 712 */ 713 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 714 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 715 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 716 panic("init: couldn't allocate argument space"); 717 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 718 p->p_vmspace->vm_ssize = 1; 719 720 if ((var = getenv("init_path")) != NULL) { 721 strlcpy(init_path, var, sizeof(init_path)); 722 freeenv(var); 723 } 724 725 for (path = init_path; *path != '\0'; path = next) { 726 while (*path == ':') 727 path++; 728 if (*path == '\0') 729 break; 730 for (next = path; *next != '\0' && *next != ':'; next++) 731 /* nothing */ ; 732 if (bootverbose) 733 printf("start_init: trying %.*s\n", (int)(next - path), 734 path); 735 736 /* 737 * Move out the boot flag argument. 738 */ 739 options = 0; 740 ucp = (char *)p->p_sysent->sv_usrstack; 741 (void)subyte(--ucp, 0); /* trailing zero */ 742 if (boothowto & RB_SINGLE) { 743 (void)subyte(--ucp, 's'); 744 options = 1; 745 } 746#ifdef notyet 747 if (boothowto & RB_FASTBOOT) { 748 (void)subyte(--ucp, 'f'); 749 options = 1; 750 } 751#endif 752 753#ifdef BOOTCDROM 754 (void)subyte(--ucp, 'C'); 755 options = 1; 756#endif 757 758 if (options == 0) 759 (void)subyte(--ucp, '-'); 760 (void)subyte(--ucp, '-'); /* leading hyphen */ 761 arg1 = ucp; 762 763 /* 764 * Move out the file name (also arg 0). 765 */ 766 (void)subyte(--ucp, 0); 767 for (s = next - 1; s >= path; s--) 768 (void)subyte(--ucp, *s); 769 arg0 = ucp; 770 771 /* 772 * Move out the arg pointers. 773 */ 774 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1)); 775 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 776 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 777 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 778 779 /* 780 * Point at the arguments. 781 */ 782 args.fname = arg0; 783 args.argv = uap; 784 args.envv = NULL; 785 786 /* 787 * Now try to exec the program. If can't for any reason 788 * other than it doesn't exist, complain. 789 * 790 * Otherwise, return via fork_trampoline() all the way 791 * to user mode as init! 792 */ 793 if ((error = sys_execve(td, &args)) == 0) { 794 mtx_unlock(&Giant); 795 return; 796 } 797 if (error != ENOENT) 798 printf("exec %.*s: error %d\n", (int)(next - path), 799 path, error); 800 } 801 printf("init: not found in path %s\n", init_path); 802 panic("no init"); 803} 804 805/* 806 * Like kproc_create(), but runs in it's own address space. 807 * We do this early to reserve pid 1. 808 * 809 * Note special case - do not make it runnable yet. Other work 810 * in progress will change this more. 811 */ 812static void 813create_init(const void *udata __unused) 814{ 815 struct ucred *newcred, *oldcred; 816 int error; 817 818 error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc, 819 NULL, 0); 820 if (error) 821 panic("cannot fork init: %d\n", error); 822 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 823 /* divorce init's credentials from the kernel's */ 824 newcred = crget(); 825 PROC_LOCK(initproc); 826 initproc->p_flag |= P_SYSTEM | P_INMEM; 827 oldcred = initproc->p_ucred; 828 crcopy(newcred, oldcred); 829#ifdef MAC 830 mac_cred_create_init(newcred); 831#endif 832#ifdef AUDIT 833 audit_cred_proc1(newcred); 834#endif 835 initproc->p_ucred = newcred; 836 PROC_UNLOCK(initproc); 837 crfree(oldcred); 838 cred_update_thread(FIRST_THREAD_IN_PROC(initproc)); 839 cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL); 840} 841SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 842 843/* 844 * Make it runnable now. 845 */ 846static void 847kick_init(const void *udata __unused) 848{ 849 struct thread *td; 850 851 td = FIRST_THREAD_IN_PROC(initproc); 852 thread_lock(td); 853 TD_SET_CAN_RUN(td); 854 sched_add(td, SRQ_BORING); 855 thread_unlock(td); 856} 857SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL); 858