1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Terrence R. Lambert 5 * All rights reserved. 6 * 7 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * (c) UNIX System Laboratories, Inc. 10 * All or some portions of this file are derived from material licensed 11 * to the University of California by American Telephone and Telegraph 12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 13 * the permission of UNIX System Laboratories, Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 44 */ 45 46 #include <sys/cdefs.h> 47 #include "opt_ddb.h" 48 #include "opt_kdb.h" 49 #include "opt_init_path.h" 50 #include "opt_verbose_sysinit.h" 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/boottrace.h> 55 #include <sys/conf.h> 56 #include <sys/cpuset.h> 57 #include <sys/dtrace_bsd.h> 58 #include <sys/epoch.h> 59 #include <sys/eventhandler.h> 60 #include <sys/exec.h> 61 #include <sys/file.h> 62 #include <sys/filedesc.h> 63 #include <sys/imgact.h> 64 #include <sys/jail.h> 65 #include <sys/kernel.h> 66 #include <sys/ktr.h> 67 #include <sys/lock.h> 68 #include <sys/loginclass.h> 69 #include <sys/malloc.h> 70 #include <sys/mount.h> 71 #include <sys/mutex.h> 72 #include <sys/proc.h> 73 #include <sys/racct.h> 74 #include <sys/reboot.h> 75 #include <sys/resourcevar.h> 76 #include <sys/sched.h> 77 #include <sys/signalvar.h> 78 #include <sys/sx.h> 79 #include <sys/syscallsubr.h> 80 #include <sys/sysctl.h> 81 #include <sys/sysent.h> 82 #include <sys/sysproto.h> 83 #include <sys/unistd.h> 84 #include <sys/vmmeter.h> 85 #include <sys/vnode.h> 86 87 #include <machine/cpu.h> 88 89 #include <security/audit/audit.h> 90 #include <security/mac/mac_framework.h> 91 92 #include <vm/vm.h> 93 #include <vm/vm_param.h> 94 #include <vm/vm_extern.h> 95 #include <vm/pmap.h> 96 #include <vm/vm_map.h> 97 #include <sys/copyright.h> 98 99 #include <ddb/ddb.h> 100 #include <ddb/db_sym.h> 101 102 void mi_startup(void); /* Should be elsewhere */ 103 104 /* Components of the first process -- never freed. */ 105 static struct session session0; 106 static struct pgrp pgrp0; 107 struct proc proc0; 108 struct thread0_storage thread0_st __aligned(32); 109 struct vmspace vmspace0; 110 struct proc *initproc; 111 112 int 113 linux_alloc_current_noop(struct thread *td __unused, int flags __unused) 114 { 115 return (0); 116 } 117 int (*lkpi_alloc_current)(struct thread *, int) = linux_alloc_current_noop; 118 119 #ifndef BOOTHOWTO 120 #define BOOTHOWTO 0 121 #endif 122 int boothowto = BOOTHOWTO; /* initialized so that it can be patched */ 123 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, 124 "Boot control flags, passed from loader"); 125 126 #ifndef BOOTVERBOSE 127 #define BOOTVERBOSE 0 128 #endif 129 int bootverbose = BOOTVERBOSE; 130 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, 131 "Control the output of verbose kernel messages"); 132 133 #ifdef VERBOSE_SYSINIT 134 /* 135 * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to 136 * dictate the default VERBOSE_SYSINIT behavior. Significant values for this 137 * option and associated tunable are: 138 * - 0, 'compiled in but silent by default' 139 * - 1, 'compiled in but verbose by default' (default) 140 */ 141 int verbose_sysinit = VERBOSE_SYSINIT; 142 TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit); 143 #endif 144 145 #ifdef INVARIANTS 146 FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance"); 147 #endif 148 149 /* 150 * This ensures that there is at least one entry so that the sysinit_set 151 * symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never 152 * executed. 153 */ 154 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL); 155 156 /* 157 * The sysinit table itself. Items are checked off as the are run. 158 * If we want to register new sysinit types, add them to newsysinit. 159 */ 160 SET_DECLARE(sysinit_set, struct sysinit); 161 struct sysinit **sysinit, **sysinit_end; 162 struct sysinit **newsysinit, **newsysinit_end; 163 164 /* 165 * Merge a new sysinit set into the current set, reallocating it if 166 * necessary. This can only be called after malloc is running. 167 */ 168 void 169 sysinit_add(struct sysinit **set, struct sysinit **set_end) 170 { 171 struct sysinit **newset; 172 struct sysinit **sipp; 173 struct sysinit **xipp; 174 int count; 175 176 count = set_end - set; 177 if (newsysinit) 178 count += newsysinit_end - newsysinit; 179 else 180 count += sysinit_end - sysinit; 181 newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT); 182 if (newset == NULL) 183 panic("cannot malloc for sysinit"); 184 xipp = newset; 185 if (newsysinit) 186 for (sipp = newsysinit; sipp < newsysinit_end; sipp++) 187 *xipp++ = *sipp; 188 else 189 for (sipp = sysinit; sipp < sysinit_end; sipp++) 190 *xipp++ = *sipp; 191 for (sipp = set; sipp < set_end; sipp++) 192 *xipp++ = *sipp; 193 if (newsysinit) 194 free(newsysinit, M_TEMP); 195 newsysinit = newset; 196 newsysinit_end = newset + count; 197 } 198 199 #if defined (DDB) && defined(VERBOSE_SYSINIT) 200 static const char * 201 symbol_name(vm_offset_t va, db_strategy_t strategy) 202 { 203 const char *name; 204 c_db_sym_t sym; 205 db_expr_t offset; 206 207 if (va == 0) 208 return (NULL); 209 sym = db_search_symbol(va, strategy, &offset); 210 if (offset != 0) 211 return (NULL); 212 db_symbol_values(sym, &name, NULL); 213 return (name); 214 } 215 #endif 216 217 /* 218 * System startup; initialize the world, create process 0, mount root 219 * filesystem, and fork to create init and pagedaemon. Most of the 220 * hard work is done in the lower-level initialization routines including 221 * startup(), which does memory initialization and autoconfiguration. 222 * 223 * This allows simple addition of new kernel subsystems that require 224 * boot time initialization. It also allows substitution of subsystem 225 * (for instance, a scheduler, kernel profiler, or VM system) by object 226 * module. Finally, it allows for optional "kernel threads". 227 */ 228 void 229 mi_startup(void) 230 { 231 232 struct sysinit **sipp; /* system initialization*/ 233 struct sysinit **xipp; /* interior loop of sort*/ 234 struct sysinit *save; /* bubble*/ 235 236 int last; 237 #if defined(VERBOSE_SYSINIT) 238 int verbose; 239 #endif 240 241 TSENTER(); 242 243 if (boothowto & RB_VERBOSE) 244 bootverbose++; 245 246 if (sysinit == NULL) { 247 sysinit = SET_BEGIN(sysinit_set); 248 sysinit_end = SET_LIMIT(sysinit_set); 249 } 250 251 restart: 252 /* 253 * Perform a bubble sort of the system initialization objects by 254 * their subsystem (primary key) and order (secondary key). 255 */ 256 TSENTER2("bubblesort"); 257 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 258 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) { 259 if ((*sipp)->subsystem < (*xipp)->subsystem || 260 ((*sipp)->subsystem == (*xipp)->subsystem && 261 (*sipp)->order <= (*xipp)->order)) 262 continue; /* skip*/ 263 save = *sipp; 264 *sipp = *xipp; 265 *xipp = save; 266 } 267 } 268 TSEXIT2("bubblesort"); 269 270 last = SI_SUB_COPYRIGHT; 271 #if defined(VERBOSE_SYSINIT) 272 verbose = 0; 273 #if !defined(DDB) 274 printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n"); 275 #endif 276 #endif 277 278 /* 279 * Traverse the (now) ordered list of system initialization tasks. 280 * Perform each task, and continue on to the next task. 281 */ 282 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 283 if ((*sipp)->subsystem == SI_SUB_DUMMY) 284 continue; /* skip dummy task(s)*/ 285 286 if ((*sipp)->subsystem == SI_SUB_DONE) 287 continue; 288 289 if ((*sipp)->subsystem > last) 290 BOOTTRACE_INIT("sysinit 0x%7x", (*sipp)->subsystem); 291 292 #if defined(VERBOSE_SYSINIT) 293 if ((*sipp)->subsystem > last && verbose_sysinit != 0) { 294 verbose = 1; 295 printf("subsystem %x\n", last); 296 } 297 if (verbose) { 298 #if defined(DDB) 299 const char *func, *data; 300 301 func = symbol_name((vm_offset_t)(*sipp)->func, 302 DB_STGY_PROC); 303 data = symbol_name((vm_offset_t)(*sipp)->udata, 304 DB_STGY_ANY); 305 if (func != NULL && data != NULL) 306 printf(" %s(&%s)... ", func, data); 307 else if (func != NULL) 308 printf(" %s(%p)... ", func, (*sipp)->udata); 309 else 310 #endif 311 printf(" %p(%p)... ", (*sipp)->func, 312 (*sipp)->udata); 313 } 314 #endif 315 316 /* Call function */ 317 (*((*sipp)->func))((*sipp)->udata); 318 319 #if defined(VERBOSE_SYSINIT) 320 if (verbose) 321 printf("done.\n"); 322 #endif 323 324 /* Check off the one we're just done */ 325 last = (*sipp)->subsystem; 326 (*sipp)->subsystem = SI_SUB_DONE; 327 328 /* Check if we've installed more sysinit items via KLD */ 329 if (newsysinit != NULL) { 330 if (sysinit != SET_BEGIN(sysinit_set)) 331 free(sysinit, M_TEMP); 332 sysinit = newsysinit; 333 sysinit_end = newsysinit_end; 334 newsysinit = NULL; 335 newsysinit_end = NULL; 336 goto restart; 337 } 338 } 339 340 TSEXIT(); /* Here so we don't overlap with start_init. */ 341 BOOTTRACE("mi_startup done"); 342 343 mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED); 344 mtx_unlock(&Giant); 345 346 /* 347 * Now hand over this thread to swapper. 348 */ 349 swapper(); 350 /* NOTREACHED*/ 351 } 352 353 static void 354 print_caddr_t(void *data) 355 { 356 printf("%s", (char *)data); 357 } 358 359 static void 360 print_version(void *data __unused) 361 { 362 int len; 363 364 /* Strip a trailing newline from version. */ 365 len = strlen(version); 366 while (len > 0 && version[len - 1] == '\n') 367 len--; 368 printf("%.*s %s\n", len, version, machine); 369 printf("%s\n", compiler_version); 370 } 371 372 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t, 373 copyright); 374 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t, 375 trademark); 376 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL); 377 378 #ifdef WITNESS 379 static char wit_warn[] = 380 "WARNING: WITNESS option enabled, expect reduced performance.\n"; 381 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH, 382 print_caddr_t, wit_warn); 383 SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH, 384 print_caddr_t, wit_warn); 385 #endif 386 387 #ifdef DIAGNOSTIC 388 static char diag_warn[] = 389 "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n"; 390 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH, 391 print_caddr_t, diag_warn); 392 SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH, 393 print_caddr_t, diag_warn); 394 #endif 395 396 #if __SIZEOF_LONG__ == 4 397 static char ilp32_warn[] = 398 "WARNING: 32-bit kernels are deprecated and may be removed in FreeBSD 15.0.\n"; 399 SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH, 400 print_caddr_t, ilp32_warn); 401 SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH, 402 print_caddr_t, ilp32_warn); 403 #endif 404 405 static int 406 null_fetch_syscall_args(struct thread *td __unused) 407 { 408 409 panic("null_fetch_syscall_args"); 410 } 411 412 static void 413 null_set_syscall_retval(struct thread *td __unused, int error __unused) 414 { 415 416 panic("null_set_syscall_retval"); 417 } 418 419 static void 420 null_set_fork_retval(struct thread *td __unused) 421 { 422 423 } 424 425 struct sysentvec null_sysvec = { 426 .sv_size = 0, 427 .sv_table = NULL, 428 .sv_fixup = NULL, 429 .sv_sendsig = NULL, 430 .sv_sigcode = NULL, 431 .sv_szsigcode = NULL, 432 .sv_name = "null", 433 .sv_coredump = NULL, 434 .sv_minsigstksz = 0, 435 .sv_minuser = VM_MIN_ADDRESS, 436 .sv_maxuser = VM_MAXUSER_ADDRESS, 437 .sv_usrstack = USRSTACK, 438 .sv_psstrings = PS_STRINGS, 439 .sv_psstringssz = sizeof(struct ps_strings), 440 .sv_stackprot = VM_PROT_ALL, 441 .sv_copyout_strings = NULL, 442 .sv_setregs = NULL, 443 .sv_fixlimit = NULL, 444 .sv_maxssiz = NULL, 445 .sv_flags = 0, 446 .sv_set_syscall_retval = null_set_syscall_retval, 447 .sv_fetch_syscall_args = null_fetch_syscall_args, 448 .sv_syscallnames = NULL, 449 .sv_schedtail = NULL, 450 .sv_thread_detach = NULL, 451 .sv_trap = NULL, 452 .sv_set_fork_retval = null_set_fork_retval, 453 .sv_regset_begin = NULL, 454 .sv_regset_end = NULL, 455 }; 456 457 /* 458 * The two following SYSINIT's are proc0 specific glue code. I am not 459 * convinced that they can not be safely combined, but their order of 460 * operation has been maintained as the same as the original init_main.c 461 * for right now. 462 */ 463 /* ARGSUSED*/ 464 static void 465 proc0_init(void *dummy __unused) 466 { 467 struct proc *p; 468 struct thread *td; 469 struct ucred *newcred; 470 struct uidinfo tmpuinfo; 471 struct loginclass tmplc = { 472 .lc_name = "", 473 }; 474 vm_paddr_t pageablemem; 475 int i; 476 477 GIANT_REQUIRED; 478 p = &proc0; 479 td = &thread0; 480 481 /* 482 * Initialize magic number and osrel. 483 */ 484 p->p_magic = P_MAGIC; 485 p->p_osrel = osreldate; 486 487 /* 488 * Initialize thread and process structures. 489 */ 490 procinit(); /* set up proc zone */ 491 threadinit(); /* set up UMA zones */ 492 493 /* 494 * Initialise scheduler resources. 495 * Add scheduler specific parts to proc, thread as needed. 496 */ 497 schedinit(); /* scheduler gets its house in order */ 498 499 /* 500 * Create process 0 (the swapper). 501 */ 502 LIST_INSERT_HEAD(&allproc, p, p_list); 503 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 504 mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 505 sx_init(&pgrp0.pg_killsx, "killpg racer"); 506 p->p_pgrp = &pgrp0; 507 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 508 LIST_INIT(&pgrp0.pg_members); 509 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 510 511 pgrp0.pg_session = &session0; 512 mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF); 513 refcount_init(&session0.s_count, 1); 514 session0.s_leader = p; 515 516 p->p_sysent = &null_sysvec; 517 p->p_flag = P_SYSTEM | P_INMEM | P_KPROC; 518 p->p_flag2 = 0; 519 p->p_state = PRS_NORMAL; 520 p->p_klist = knlist_alloc(&p->p_mtx); 521 STAILQ_INIT(&p->p_ktr); 522 p->p_nice = NZERO; 523 td->td_tid = THREAD0_TID; 524 tidhash_add(td); 525 TD_SET_STATE(td, TDS_RUNNING); 526 td->td_pri_class = PRI_TIMESHARE; 527 td->td_user_pri = PUSER; 528 td->td_base_user_pri = PUSER; 529 td->td_lend_user_pri = PRI_MAX; 530 td->td_priority = PVM; 531 td->td_base_pri = PVM; 532 td->td_oncpu = curcpu; 533 td->td_flags = TDF_INMEM; 534 td->td_pflags = TDP_KTHREAD; 535 td->td_cpuset = cpuset_thread0(); 536 td->td_domain.dr_policy = td->td_cpuset->cs_domain; 537 prison0_init(); 538 p->p_peers = 0; 539 p->p_leader = p; 540 p->p_reaper = p; 541 p->p_treeflag |= P_TREE_REAPER; 542 LIST_INIT(&p->p_reaplist); 543 544 strncpy(p->p_comm, "kernel", sizeof (p->p_comm)); 545 strncpy(td->td_name, "swapper", sizeof (td->td_name)); 546 547 callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0); 548 callout_init_mtx(&p->p_limco, &p->p_mtx, 0); 549 callout_init(&td->td_slpcallout, 1); 550 TAILQ_INIT(&p->p_kqtim_stop); 551 552 /* Create credentials. */ 553 newcred = crget(); 554 newcred->cr_ngroups = 1; /* group 0 */ 555 /* A hack to prevent uifind from tripping over NULL pointers. */ 556 curthread->td_ucred = newcred; 557 tmpuinfo.ui_uid = 1; 558 newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo; 559 newcred->cr_uidinfo = uifind(0); 560 newcred->cr_ruidinfo = uifind(0); 561 newcred->cr_loginclass = &tmplc; 562 newcred->cr_loginclass = loginclass_find("default"); 563 /* End hack. creds get properly set later with thread_cow_get_proc */ 564 curthread->td_ucred = NULL; 565 newcred->cr_prison = &prison0; 566 newcred->cr_users++; /* avoid assertion failure */ 567 proc_set_cred_init(p, newcred); 568 newcred->cr_users--; 569 crfree(newcred); 570 #ifdef AUDIT 571 audit_cred_kproc0(newcred); 572 #endif 573 #ifdef MAC 574 mac_cred_create_swapper(newcred); 575 #endif 576 /* Create sigacts. */ 577 p->p_sigacts = sigacts_alloc(); 578 579 /* Initialize signal state for process 0. */ 580 siginit(&proc0); 581 582 /* Create the file descriptor table. */ 583 p->p_pd = pdinit(NULL, false); 584 p->p_fd = fdinit(); 585 p->p_fdtol = NULL; 586 587 /* Create the limits structures. */ 588 p->p_limit = lim_alloc(); 589 for (i = 0; i < RLIM_NLIMITS; i++) 590 p->p_limit->pl_rlimit[i].rlim_cur = 591 p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY; 592 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur = 593 p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 594 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur = 595 p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 596 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz; 597 p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz; 598 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz; 599 p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz; 600 /* Cast to avoid overflow on i386/PAE. */ 601 pageablemem = ptoa((vm_paddr_t)vm_free_count()); 602 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur = 603 p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem; 604 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3; 605 p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem; 606 p->p_cpulimit = RLIM_INFINITY; 607 608 PROC_LOCK(p); 609 thread_cow_get_proc(td, p); 610 PROC_UNLOCK(p); 611 612 /* Initialize resource accounting structures. */ 613 racct_create(&p->p_racct); 614 615 p->p_stats = pstats_alloc(); 616 617 /* Allocate a prototype map so we have something to fork. */ 618 p->p_vmspace = &vmspace0; 619 refcount_init(&vmspace0.vm_refcnt, 1); 620 pmap_pinit0(vmspace_pmap(&vmspace0)); 621 622 /* 623 * proc0 is not expected to enter usermode, so there is no special 624 * handling for sv_minuser here, like is done for exec_new_vmspace(). 625 */ 626 vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0), 627 p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser); 628 629 /* 630 * Call the init and ctor for the new thread and proc. We wait 631 * to do this until all other structures are fairly sane. 632 */ 633 EVENTHANDLER_DIRECT_INVOKE(process_init, p); 634 EVENTHANDLER_DIRECT_INVOKE(thread_init, td); 635 #ifdef KDTRACE_HOOKS 636 kdtrace_proc_ctor(p); 637 kdtrace_thread_ctor(td); 638 #endif 639 EVENTHANDLER_DIRECT_INVOKE(process_ctor, p); 640 EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td); 641 642 /* 643 * Charge root for one process. 644 */ 645 (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0); 646 PROC_LOCK(p); 647 racct_add_force(p, RACCT_NPROC, 1); 648 PROC_UNLOCK(p); 649 } 650 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL); 651 652 /* ARGSUSED*/ 653 static void 654 proc0_post(void *dummy __unused) 655 { 656 struct proc *p; 657 struct rusage ru; 658 struct thread *td; 659 660 /* 661 * Now we can look at the time, having had a chance to verify the 662 * time from the filesystem. Pretend that proc0 started now. 663 */ 664 sx_slock(&allproc_lock); 665 FOREACH_PROC_IN_SYSTEM(p) { 666 PROC_LOCK(p); 667 if (p->p_state == PRS_NEW) { 668 PROC_UNLOCK(p); 669 continue; 670 } 671 microuptime(&p->p_stats->p_start); 672 PROC_STATLOCK(p); 673 rufetch(p, &ru); /* Clears thread stats */ 674 p->p_rux.rux_runtime = 0; 675 p->p_rux.rux_uticks = 0; 676 p->p_rux.rux_sticks = 0; 677 p->p_rux.rux_iticks = 0; 678 PROC_STATUNLOCK(p); 679 FOREACH_THREAD_IN_PROC(p, td) { 680 td->td_runtime = 0; 681 } 682 PROC_UNLOCK(p); 683 } 684 sx_sunlock(&allproc_lock); 685 PCPU_SET(switchtime, cpu_ticks()); 686 PCPU_SET(switchticks, ticks); 687 } 688 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL); 689 690 /* 691 *************************************************************************** 692 **** 693 **** The following SYSINIT's and glue code should be moved to the 694 **** respective files on a per subsystem basis. 695 **** 696 *************************************************************************** 697 */ 698 699 /* 700 * List of paths to try when searching for "init". 701 */ 702 static char init_path[MAXPATHLEN] = 703 #ifdef INIT_PATH 704 __XSTRING(INIT_PATH); 705 #else 706 "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init"; 707 #endif 708 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0, 709 "Path used to search the init process"); 710 711 /* 712 * Shutdown timeout of init(8). 713 * Unused within kernel, but used to control init(8), hence do not remove. 714 */ 715 #ifndef INIT_SHUTDOWN_TIMEOUT 716 #define INIT_SHUTDOWN_TIMEOUT 120 717 #endif 718 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT; 719 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout, 720 CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). " 721 "Unused within kernel, but used to control init(8)"); 722 723 /* 724 * Start the initial user process; try exec'ing each pathname in init_path. 725 * The program is invoked with one argument containing the boot flags. 726 */ 727 static void 728 start_init(void *dummy) 729 { 730 struct image_args args; 731 int error; 732 char *var, *path; 733 char *free_init_path, *tmp_init_path; 734 struct thread *td; 735 struct proc *p; 736 struct vmspace *oldvmspace; 737 738 TSENTER(); /* Here so we don't overlap with mi_startup. */ 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 /* For Multicons, report which console is primary to both */ 749 if (boothowto & RB_MULTIPLE) { 750 if (boothowto & RB_SERIAL) 751 printf("Dual Console: Serial Primary, Video Secondary\n"); 752 else 753 printf("Dual Console: Video Primary, Serial Secondary\n"); 754 } 755 756 if ((var = kern_getenv("init_path")) != NULL) { 757 strlcpy(init_path, var, sizeof(init_path)); 758 freeenv(var); 759 } 760 free_init_path = tmp_init_path = strdup(init_path, M_TEMP); 761 762 while ((path = strsep(&tmp_init_path, ":")) != NULL) { 763 if (bootverbose) 764 printf("start_init: trying %s\n", path); 765 766 memset(&args, 0, sizeof(args)); 767 error = exec_alloc_args(&args); 768 if (error != 0) 769 panic("%s: Can't allocate space for init arguments %d", 770 __func__, error); 771 772 error = exec_args_add_fname(&args, path, UIO_SYSSPACE); 773 if (error != 0) 774 panic("%s: Can't add fname %d", __func__, error); 775 error = exec_args_add_arg(&args, path, UIO_SYSSPACE); 776 if (error != 0) 777 panic("%s: Can't add argv[0] %d", __func__, error); 778 if (boothowto & RB_SINGLE) 779 error = exec_args_add_arg(&args, "-s", UIO_SYSSPACE); 780 if (error != 0) 781 panic("%s: Can't add argv[0] %d", __func__, error); 782 783 /* 784 * Now try to exec the program. If can't for any reason 785 * other than it doesn't exist, complain. 786 * 787 * Otherwise, return via fork_trampoline() all the way 788 * to user mode as init! 789 */ 790 KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0, 791 ("nested execve")); 792 oldvmspace = p->p_vmspace; 793 error = kern_execve(td, &args, NULL, oldvmspace); 794 KASSERT(error != 0, 795 ("kern_execve returned success, not EJUSTRETURN")); 796 if (error == EJUSTRETURN) { 797 exec_cleanup(td, oldvmspace); 798 free(free_init_path, M_TEMP); 799 TSEXIT(); 800 return; 801 } 802 if (error != ENOENT) 803 printf("exec %s: error %d\n", path, error); 804 } 805 free(free_init_path, M_TEMP); 806 printf("init: not found in path %s\n", init_path); 807 panic("no init"); 808 } 809 810 /* 811 * Like kproc_create(), but runs in its own address space. We do this 812 * early to reserve pid 1. Note special case - do not make it 813 * runnable yet, init execution is started when userspace can be served. 814 */ 815 static void 816 create_init(const void *udata __unused) 817 { 818 struct fork_req fr; 819 struct ucred *newcred, *oldcred; 820 struct thread *td; 821 int error; 822 823 bzero(&fr, sizeof(fr)); 824 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED; 825 fr.fr_procp = &initproc; 826 error = fork1(&thread0, &fr); 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 oldcred = initproc->p_ucred; 837 crcopy(newcred, oldcred); 838 #ifdef MAC 839 mac_cred_create_init(newcred); 840 #endif 841 #ifdef AUDIT 842 audit_cred_proc1(newcred); 843 #endif 844 proc_set_cred(initproc, newcred); 845 td = FIRST_THREAD_IN_PROC(initproc); 846 crcowfree(td); 847 td->td_realucred = crcowget(initproc->p_ucred); 848 td->td_ucred = td->td_realucred; 849 PROC_UNLOCK(initproc); 850 sx_xunlock(&proctree_lock); 851 crfree(oldcred); 852 cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc), 853 start_init, NULL); 854 } 855 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL); 856 857 /* 858 * Make it runnable now. 859 */ 860 static void 861 kick_init(const void *udata __unused) 862 { 863 struct thread *td; 864 865 td = FIRST_THREAD_IN_PROC(initproc); 866 thread_lock(td); 867 TD_SET_CAN_RUN(td); 868 sched_add(td, SRQ_BORING); 869 } 870 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL); 871 872 /* 873 * DDB(4). 874 */ 875 #ifdef DDB 876 static void 877 db_show_print_syinit(struct sysinit *sip, bool ddb) 878 { 879 const char *sname, *funcname; 880 c_db_sym_t sym; 881 db_expr_t offset; 882 883 #define xprint(...) \ 884 if (ddb) \ 885 db_printf(__VA_ARGS__); \ 886 else \ 887 printf(__VA_ARGS__) 888 889 if (sip == NULL) { 890 xprint("%s: no sysinit * given\n", __func__); 891 return; 892 } 893 894 sym = db_search_symbol((vm_offset_t)sip, DB_STGY_ANY, &offset); 895 db_symbol_values(sym, &sname, NULL); 896 sym = db_search_symbol((vm_offset_t)sip->func, DB_STGY_PROC, &offset); 897 db_symbol_values(sym, &funcname, NULL); 898 xprint("%s(%p)\n", (sname != NULL) ? sname : "", sip); 899 xprint(" %#08x %#08x\n", sip->subsystem, sip->order); 900 xprint(" %p(%s)(%p)\n", 901 sip->func, (funcname != NULL) ? funcname : "", sip->udata); 902 #undef xprint 903 } 904 905 DB_SHOW_COMMAND_FLAGS(sysinit, db_show_sysinit, DB_CMD_MEMSAFE) 906 { 907 struct sysinit **sipp; 908 909 db_printf("SYSINIT vs Name(Ptr)\n"); 910 db_printf(" Subsystem Order\n"); 911 db_printf(" Function(Name)(Arg)\n"); 912 for (sipp = sysinit; sipp < sysinit_end; sipp++) { 913 db_show_print_syinit(*sipp, true); 914 if (db_pager_quit) 915 break; 916 } 917 } 918 #endif /* DDB */ 919