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/11/sys/kern/init_main.c 363709 2020-07-30 17:18:42Z brooks $"); 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 <vm/vm_domain.h> 91#include <sys/copyright.h> 92 93#include <ddb/ddb.h> 94#include <ddb/db_sym.h> 95 96void mi_startup(void); /* Should be elsewhere */ 97 98/* Components of the first process -- never freed. */ 99static struct session session0; 100static struct pgrp pgrp0; 101struct proc proc0; 102struct thread0_storage thread0_st __aligned(32); 103struct vmspace vmspace0; 104struct proc *initproc; 105 106#ifndef BOOTHOWTO 107#define BOOTHOWTO 0 108#endif 109int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 110SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 111 "Boot control flags, passed from loader"); 112 113#ifndef BOOTVERBOSE 114#define BOOTVERBOSE 0 115#endif 116int bootverbose = BOOTVERBOSE; 117SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 118 "Control the output of verbose kernel messages"); 119 120#ifdef VERBOSE_SYSINIT 121/* 122 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 123 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 124 * option and associated tunable are: 125 * - 0, 'compiled in but silent by default' 126 * - 1, 'compiled in but verbose by default' (default) 127 */ 128int verbose_sysinit = VERBOSE_SYSINIT; 129TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 130#endif 131 132#ifdef INVARIANTS 133FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 134#endif 135 136/* 137 * This ensures that there is at least one entry so that the sysinit_set 138 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 139 * executed. 140 */ 141SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 142 143/* 144 * The sysinit table itself. Items are checked off as the are run. 145 * If we want to register new sysinit types, add them to newsysinit. 146 */ 147SET_DECLARE(sysinit_set, struct sysinit); 148struct sysinit **sysinit, **sysinit_end; 149struct sysinit **newsysinit, **newsysinit_end; 150 151EVENTHANDLER_LIST_DECLARE(process_init); 152EVENTHANDLER_LIST_DECLARE(thread_init); 153EVENTHANDLER_LIST_DECLARE(process_ctor); 154EVENTHANDLER_LIST_DECLARE(thread_ctor); 155 156/* 157 * Merge a new sysinit set into the current set, reallocating it if 158 * necessary. This can only be called after malloc is running. 159 */ 160void 161sysinit_add(struct sysinit **set, struct sysinit **set_end) 162{ 163 struct sysinit **newset; 164 struct sysinit **sipp; 165 struct sysinit **xipp; 166 int count; 167 168 count = set_end - set; 169 if (newsysinit) 170 count += newsysinit_end - newsysinit; 171 else 172 count += sysinit_end - sysinit; 173 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 174 if (newset == NULL) 175 panic("cannot malloc for sysinit"); 176 xipp = newset; 177 if (newsysinit) 178 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 179 *xipp++ = *sipp; 180 else 181 for (sipp = sysinit; sipp < sysinit_end; sipp++) 182 *xipp++ = *sipp; 183 for (sipp = set; sipp < set_end; sipp++) 184 *xipp++ = *sipp; 185 if (newsysinit) 186 free(newsysinit, M_TEMP); 187 newsysinit = newset; 188 newsysinit_end = newset + count; 189} 190 191#if defined (DDB) && defined(VERBOSE_SYSINIT) 192static const char * 193symbol_name(vm_offset_t va, db_strategy_t strategy) 194{ 195 const char *name; 196 c_db_sym_t sym; 197 db_expr_t offset; 198 199 if (va == 0) 200 return (NULL); 201 sym = db_search_symbol(va, strategy, &offset); 202 if (offset != 0) 203 return (NULL); 204 db_symbol_values(sym, &name, NULL); 205 return (name); 206} 207#endif 208 209/* 210 * System startup; initialize the world, create process 0, mount root 211 * filesystem, and fork to create init and pagedaemon. Most of the 212 * hard work is done in the lower-level initialization routines including 213 * startup(), which does memory initialization and autoconfiguration. 214 * 215 * This allows simple addition of new kernel subsystems that require 216 * boot time initialization. It also allows substitution of subsystem 217 * (for instance, a scheduler, kernel profiler, or VM system) by object 218 * module. Finally, it allows for optional "kernel threads". 219 */ 220void 221mi_startup(void) 222{ 223 224 register struct sysinit **sipp; /* system initialization*/ 225 register struct sysinit **xipp; /* interior loop of sort*/ 226 register struct sysinit *save; /* bubble*/ 227 228#if defined(VERBOSE_SYSINIT) 229 int last; 230 int verbose; 231#endif 232 233 if (boothowto & RB_VERBOSE) 234 bootverbose++; 235 236 if (sysinit == NULL) { 237 sysinit = SET_BEGIN(sysinit_set); 238 sysinit_end = SET_LIMIT(sysinit_set); 239 } 240 241restart: 242 /* 243 * Perform a bubble sort of the system initialization objects by 244 * their subsystem (primary key) and order (secondary key). 245 */ 246 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 247 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 248 if ((*sipp)->subsystem < (*xipp)->subsystem || 249 ((*sipp)->subsystem == (*xipp)->subsystem && 250 (*sipp)->order <= (*xipp)->order)) 251 continue; /* skip*/ 252 save = *sipp; 253 *sipp = *xipp; 254 *xipp = save; 255 } 256 } 257 258#if defined(VERBOSE_SYSINIT) 259 last = SI_SUB_COPYRIGHT; 260 verbose = 0; 261#if !defined(DDB) 262 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 263#endif 264#endif 265 266 /* 267 * Traverse the (now) ordered list of system initialization tasks. 268 * Perform each task, and continue on to the next task. 269 */ 270 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 271 272 if ((*sipp)->subsystem == SI_SUB_DUMMY) 273 continue; /* skip dummy task(s)*/ 274 275 if ((*sipp)->subsystem == SI_SUB_DONE) 276 continue; 277 278#if defined(VERBOSE_SYSINIT) 279 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 280 verbose = 1; 281 last = (*sipp)->subsystem; 282 printf("subsystem %x\n", last); 283 } 284 if (verbose) { 285#if defined(DDB) 286 const char *func, *data; 287 288 func = symbol_name((vm_offset_t)(*sipp)->func, 289 DB_STGY_PROC); 290 data = symbol_name((vm_offset_t)(*sipp)->udata, 291 DB_STGY_ANY); 292 if (func != NULL && data != NULL) 293 printf(" %s(&%s)... ", func, data); 294 else if (func != NULL) 295 printf(" %s(%p)... ", func, (*sipp)->udata); 296 else 297#endif 298 printf(" %p(%p)... ", (*sipp)->func, 299 (*sipp)->udata); 300 } 301#endif 302 303 /* Call function */ 304 (*((*sipp)->func))((*sipp)->udata); 305 306#if defined(VERBOSE_SYSINIT) 307 if (verbose) 308 printf("done.\n"); 309#endif 310 311 /* Check off the one we're just done */ 312 (*sipp)->subsystem = SI_SUB_DONE; 313 314 /* Check if we've installed more sysinit items via KLD */ 315 if (newsysinit != NULL) { 316 if (sysinit != SET_BEGIN(sysinit_set)) 317 free(sysinit, M_TEMP); 318 sysinit = newsysinit; 319 sysinit_end = newsysinit_end; 320 newsysinit = NULL; 321 newsysinit_end = NULL; 322 goto restart; 323 } 324 } 325 326 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 327 mtx_unlock(&Giant); 328 329 /* 330 * Now hand over this thread to swapper. 331 */ 332 swapper(); 333 /* NOTREACHED*/ 334} 335 336 337/* 338 *************************************************************************** 339 **** 340 **** The following SYSINIT's belong elsewhere, but have not yet 341 **** been moved. 342 **** 343 *************************************************************************** 344 */ 345static void 346print_caddr_t(void *data) 347{ 348 printf("%s", (char *)data); 349} 350 351static void 352print_version(void *data __unused) 353{ 354 int len; 355 356 /* Strip a trailing newline from version. */ 357 len = strlen(version); 358 while (len > 0 && version[len - 1] == '\n') 359 len--; 360 printf("%.*s %s\n", len, version, machine); 361 printf("%s\n", compiler_version); 362} 363 364SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 365 copyright); 366SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 367 trademark); 368SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 369 370#ifdef WITNESS 371static char wit_warn[] = 372 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 373SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH, 374 print_caddr_t, wit_warn); 375SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH, 376 print_caddr_t, wit_warn); 377#endif 378 379#ifdef DIAGNOSTIC 380static char diag_warn[] = 381 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 382SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH, 383 print_caddr_t, diag_warn); 384SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH, 385 print_caddr_t, diag_warn); 386#endif 387 388static int 389null_fetch_syscall_args(struct thread *td __unused) 390{ 391 392 panic("null_fetch_syscall_args"); 393} 394 395static void 396null_set_syscall_retval(struct thread *td __unused, int error __unused) 397{ 398 399 panic("null_set_syscall_retval"); 400} 401 402struct sysentvec null_sysvec = { 403 .sv_size = 0, 404 .sv_table = NULL, 405 .sv_mask = 0, 406 .sv_errsize = 0, 407 .sv_errtbl = NULL, 408 .sv_transtrap = NULL, 409 .sv_fixup = NULL, 410 .sv_sendsig = NULL, 411 .sv_sigcode = NULL, 412 .sv_szsigcode = NULL, 413 .sv_name = "null", 414 .sv_coredump = NULL, 415 .sv_imgact_try = NULL, 416 .sv_minsigstksz = 0, 417 .sv_pagesize = PAGE_SIZE, 418 .sv_minuser = VM_MIN_ADDRESS, 419 .sv_maxuser = VM_MAXUSER_ADDRESS, 420 .sv_usrstack = USRSTACK, 421 .sv_psstrings = PS_STRINGS, 422 .sv_stackprot = VM_PROT_ALL, 423 .sv_copyout_strings = NULL, 424 .sv_setregs = NULL, 425 .sv_fixlimit = NULL, 426 .sv_maxssiz = NULL, 427 .sv_flags = 0, 428 .sv_set_syscall_retval = null_set_syscall_retval, 429 .sv_fetch_syscall_args = null_fetch_syscall_args, 430 .sv_syscallnames = NULL, 431 .sv_schedtail = NULL, 432 .sv_thread_detach = NULL, 433 .sv_trap = NULL, 434}; 435 436/* 437 *************************************************************************** 438 **** 439 **** The two following SYSINIT's are proc0 specific glue code. I am not 440 **** convinced that they can not be safely combined, but their order of 441 **** operation has been maintained as the same as the original init_main.c 442 **** for right now. 443 **** 444 **** These probably belong in init_proc.c or kern_proc.c, since they 445 **** deal with proc0 (the fork template process). 446 **** 447 *************************************************************************** 448 */ 449/* ARGSUSED*/ 450static void 451proc0_init(void *dummy __unused) 452{ 453 struct proc *p; 454 struct thread *td; 455 struct ucred *newcred; 456 vm_paddr_t pageablemem; 457 int i; 458 459 GIANT_REQUIRED; 460 p = &proc0; 461 td = &thread0; 462 463 /* 464 * Initialize magic number and osrel. 465 */ 466 p->p_magic = P_MAGIC; 467 p->p_osrel = osreldate; 468 469 /* 470 * Initialize thread and process structures. 471 */ 472 procinit(); /* set up proc zone */ 473 threadinit(); /* set up UMA zones */ 474 475 /* 476 * Initialise scheduler resources. 477 * Add scheduler specific parts to proc, thread as needed. 478 */ 479 schedinit(); /* scheduler gets its house in order */ 480 481 /* 482 * Create process 0 (the swapper). 483 */ 484 LIST_INSERT_HEAD(&allproc, p, p_list); 485 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 486 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 487 p->p_pgrp = &pgrp0; 488 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 489 LIST_INIT(&pgrp0.pg_members); 490 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 491 492 pgrp0.pg_session = &session0; 493 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 494 refcount_init(&session0.s_count, 1); 495 session0.s_leader = p; 496 497 p->p_sysent = &null_sysvec; 498 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC; 499 p->p_flag2 = 0; 500 p->p_state = PRS_NORMAL; 501 p->p_klist = knlist_alloc(&p->p_mtx); 502 STAILQ_INIT(&p->p_ktr); 503 p->p_nice = NZERO; 504 /* pid_max cannot be greater than PID_MAX */ 505 td->td_tid = PID_MAX + 1; 506 LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); 507 td->td_state = TDS_RUNNING; 508 td->td_pri_class = PRI_TIMESHARE; 509 td->td_user_pri = PUSER; 510 td->td_base_user_pri = PUSER; 511 td->td_lend_user_pri = PRI_MAX; 512 td->td_priority = PVM; 513 td->td_base_pri = PVM; 514 td->td_oncpu = 0; 515 td->td_flags = TDF_INMEM; 516 td->td_pflags = TDP_KTHREAD; 517 td->td_cpuset = cpuset_thread0(); 518 vm_domain_policy_init(&td->td_vm_dom_policy); 519 vm_domain_policy_set(&td->td_vm_dom_policy, VM_POLICY_NONE, -1); 520 vm_domain_policy_init(&p->p_vm_dom_policy); 521 vm_domain_policy_set(&p->p_vm_dom_policy, VM_POLICY_NONE, -1); 522 prison0_init(); 523 p->p_peers = 0; 524 p->p_leader = p; 525 p->p_reaper = p; 526 LIST_INIT(&p->p_reaplist); 527 528 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 529 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 530 531 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 532 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 533 callout_init(&td->td_slpcallout, 1); 534 535 /* Create credentials. */ 536 newcred = crget(); 537 newcred->cr_ngroups = 1; /* group 0 */ 538 newcred->cr_uidinfo = uifind(0); 539 newcred->cr_ruidinfo = uifind(0); 540 newcred->cr_prison = &prison0; 541 newcred->cr_loginclass = loginclass_find("default"); 542 proc_set_cred_init(p, newcred); 543#ifdef AUDIT 544 audit_cred_kproc0(newcred); 545#endif 546#ifdef MAC 547 mac_cred_create_swapper(newcred); 548#endif 549 /* Create sigacts. */ 550 p->p_sigacts = sigacts_alloc(); 551 552 /* Initialize signal state for process 0. */ 553 siginit(&proc0); 554 555 /* Create the file descriptor table. */ 556 p->p_fd = fdinit(NULL, false); 557 p->p_fdtol = NULL; 558 559 /* Create the limits structures. */ 560 p->p_limit = lim_alloc(); 561 for (i = 0; i < RLIM_NLIMITS; i++) 562 p->p_limit->pl_rlimit[i].rlim_cur = 563 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 564 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 565 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 566 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 567 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 568 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 569 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 570 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 571 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 572 /* Cast to avoid overflow on i386/PAE. */ 573 pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count); 574 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 575 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 576 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 577 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 578 p->p_cpulimit = RLIM_INFINITY; 579 580 PROC_LOCK(p); 581 thread_cow_get_proc(td, p); 582 PROC_UNLOCK(p); 583 584 /* Initialize resource accounting structures. */ 585 racct_create(&p->p_racct); 586 587 p->p_stats = pstats_alloc(); 588 589 /* Allocate a prototype map so we have something to fork. */ 590 p->p_vmspace = &vmspace0; 591 vmspace0.vm_refcnt = 1; 592 pmap_pinit0(vmspace_pmap(&vmspace0)); 593 594 /* 595 * proc0 is not expected to enter usermode, so there is no special 596 * handling for sv_minuser here, like is done for exec_new_vmspace(). 597 */ 598 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 599 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 600 601 /* 602 * Call the init and ctor for the new thread and proc. We wait 603 * to do this until all other structures are fairly sane. 604 */ 605 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 606 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 607 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 608 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 609 610 /* 611 * Charge root for one process. 612 */ 613 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 614 PROC_LOCK(p); 615 racct_add_force(p, RACCT_NPROC, 1); 616 PROC_UNLOCK(p); 617} 618SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 619 620/* ARGSUSED*/ 621static void 622proc0_post(void *dummy __unused) 623{ 624 struct timespec ts; 625 struct proc *p; 626 struct rusage ru; 627 struct thread *td; 628 629 /* 630 * Now we can look at the time, having had a chance to verify the 631 * time from the filesystem. Pretend that proc0 started now. 632 */ 633 sx_slock(&allproc_lock); 634 FOREACH_PROC_IN_SYSTEM(p) { 635 PROC_LOCK(p); 636 if (p->p_state == PRS_NEW) { 637 PROC_UNLOCK(p); 638 continue; 639 } 640 microuptime(&p->p_stats->p_start); 641 PROC_STATLOCK(p); 642 rufetch(p, &ru); /* Clears thread stats */ 643 p->p_rux.rux_runtime = 0; 644 p->p_rux.rux_uticks = 0; 645 p->p_rux.rux_sticks = 0; 646 p->p_rux.rux_iticks = 0; 647 PROC_STATUNLOCK(p); 648 FOREACH_THREAD_IN_PROC(p, td) { 649 td->td_runtime = 0; 650 } 651 PROC_UNLOCK(p); 652 } 653 sx_sunlock(&allproc_lock); 654 PCPU_SET(switchtime, cpu_ticks()); 655 PCPU_SET(switchticks, ticks); 656 657 /* 658 * Give the ``random'' number generator a thump. 659 */ 660 nanotime(&ts); 661 srandom(ts.tv_sec ^ ts.tv_nsec); 662} 663SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 664 665static void 666random_init(void *dummy __unused) 667{ 668 669 /* 670 * After CPU has been started we have some randomness on most 671 * platforms via get_cyclecount(). For platforms that don't 672 * we will reseed random(9) in proc0_post() as well. 673 */ 674 srandom(get_cyclecount()); 675} 676SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL); 677 678/* 679 *************************************************************************** 680 **** 681 **** The following SYSINIT's and glue code should be moved to the 682 **** respective files on a per subsystem basis. 683 **** 684 *************************************************************************** 685 */ 686 687 688/* 689 *************************************************************************** 690 **** 691 **** The following code probably belongs in another file, like 692 **** kern/init_init.c. 693 **** 694 *************************************************************************** 695 */ 696 697/* 698 * List of paths to try when searching for "init". 699 */ 700static char init_path[MAXPATHLEN] = 701#ifdef INIT_PATH 702 __XSTRING(INIT_PATH); 703#else 704 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 705#endif 706SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 707 "Path used to search the init process"); 708 709/* 710 * Shutdown timeout of init(8). 711 * Unused within kernel, but used to control init(8), hence do not remove. 712 */ 713#ifndef INIT_SHUTDOWN_TIMEOUT 714#define INIT_SHUTDOWN_TIMEOUT 120 715#endif 716static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 717SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 718 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 719 "Unused within kernel, but used to control init(8)"); 720 721/* 722 * Start the initial user process; try exec'ing each pathname in init_path. 723 * The program is invoked with one argument containing the boot flags. 724 */ 725static void 726start_init(void *dummy) 727{ 728 vm_offset_t addr; 729 struct execve_args args; 730 int options, error; 731 char *var, *path, *next, *s; 732 char *ucp, **uap, *arg0, *arg1; 733 struct thread *td; 734 struct proc *p; 735 736 mtx_lock(&Giant); 737 738 GIANT_REQUIRED; 739 740 td = curthread; 741 p = td->td_proc; 742 743 vfs_mountroot(); 744 745 /* Wipe GELI passphrase from the environment. */ 746 kern_unsetenv("kern.geom.eli.passphrase"); 747 748 /* 749 * Need just enough stack to hold the faked-up "execve()" arguments. 750 */ 751 addr = p->p_sysent->sv_usrstack - PAGE_SIZE; 752 if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0, 753 VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0) 754 panic("init: couldn't allocate argument space"); 755 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 756 p->p_vmspace->vm_ssize = 1; 757 758 if ((var = kern_getenv("init_path")) != NULL) { 759 strlcpy(init_path, var, sizeof(init_path)); 760 freeenv(var); 761 } 762 763 for (path = init_path; *path != '\0'; path = next) { 764 while (*path == ':') 765 path++; 766 if (*path == '\0') 767 break; 768 for (next = path; *next != '\0' && *next != ':'; next++) 769 /* nothing */ ; 770 if (bootverbose) 771 printf("start_init: trying %.*s\n", (int)(next - path), 772 path); 773 774 /* 775 * Move out the boot flag argument. 776 */ 777 options = 0; 778 ucp = (char *)p->p_sysent->sv_usrstack; 779 (void)subyte(--ucp, 0); /* trailing zero */ 780 if (boothowto & RB_SINGLE) { 781 (void)subyte(--ucp, 's'); 782 options = 1; 783 } 784#ifdef notyet 785 if (boothowto & RB_FASTBOOT) { 786 (void)subyte(--ucp, 'f'); 787 options = 1; 788 } 789#endif 790 791#ifdef BOOTCDROM 792 (void)subyte(--ucp, 'C'); 793 options = 1; 794#endif 795 796 if (options == 0) 797 (void)subyte(--ucp, '-'); 798 (void)subyte(--ucp, '-'); /* leading hyphen */ 799 arg1 = ucp; 800 801 /* 802 * Move out the file name (also arg 0). 803 */ 804 (void)subyte(--ucp, 0); 805 for (s = next - 1; s >= path; s--) 806 (void)subyte(--ucp, *s); 807 arg0 = ucp; 808 809 /* 810 * Move out the arg pointers. 811 */ 812 uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t)); 813 (void)suword((caddr_t)--uap, (long)0); /* terminator */ 814 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1); 815 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0); 816 817 /* 818 * Point at the arguments. 819 */ 820 args.fname = arg0; 821 args.argv = uap; 822 args.envv = NULL; 823 824 /* 825 * Now try to exec the program. If can't for any reason 826 * other than it doesn't exist, complain. 827 * 828 * Otherwise, return via fork_trampoline() all the way 829 * to user mode as init! 830 */ 831 if ((error = sys_execve(td, &args)) == 0) { 832 mtx_unlock(&Giant); 833 return; 834 } 835 if (error != ENOENT) 836 printf("exec %.*s: error %d\n", (int)(next - path), 837 path, error); 838 } 839 printf("init: not found in path %s\n", init_path); 840 panic("no init"); 841} 842 843/* 844 * Like kproc_create(), but runs in its own address space. We do this 845 * early to reserve pid 1. Note special case - do not make it 846 * runnable yet, init execution is started when userspace can be served. 847 */ 848static void 849create_init(const void *udata __unused) 850{ 851 struct fork_req fr; 852 struct ucred *newcred, *oldcred; 853 struct thread *td; 854 int error; 855 856 bzero(&fr, sizeof(fr)); 857 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 858 fr.fr_procp = &initproc; 859 error = fork1(&thread0, &fr); 860 if (error) 861 panic("cannot fork init: %d\n", error); 862 KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1")); 863 /* divorce init's credentials from the kernel's */ 864 newcred = crget(); 865 sx_xlock(&proctree_lock); 866 PROC_LOCK(initproc); 867 initproc->p_flag |= P_SYSTEM | P_INMEM; 868 initproc->p_treeflag |= P_TREE_REAPER; 869 LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling); 870 oldcred = initproc->p_ucred; 871 crcopy(newcred, oldcred); 872#ifdef MAC 873 mac_cred_create_init(newcred); 874#endif 875#ifdef AUDIT 876 audit_cred_proc1(newcred); 877#endif 878 proc_set_cred(initproc, newcred); 879 td = FIRST_THREAD_IN_PROC(initproc); 880 crfree(td->td_ucred); 881 td->td_ucred = crhold(initproc->p_ucred); 882 PROC_UNLOCK(initproc); 883 sx_xunlock(&proctree_lock); 884 crfree(oldcred); 885 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 886 start_init, NULL); 887} 888SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 889 890/* 891 * Make it runnable now. 892 */ 893static void 894kick_init(const void *udata __unused) 895{ 896 struct thread *td; 897 898 td = FIRST_THREAD_IN_PROC(initproc); 899 thread_lock(td); 900 TD_SET_CAN_RUN(td); 901 sched_add(td, SRQ_BORING); 902 thread_unlock(td); 903} 904SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 905