sys/kern/init_main.c

   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/mount.h>
  59 #include <sys/mutex.h>
  60 #include <sys/syscallsubr.h>
  61 #include <sys/sysctl.h>
  62 #include <sys/proc.h>
  63 #include <sys/resourcevar.h>
  64 #include <sys/systm.h>
  65 #include <sys/signalvar.h>
  66 #include <sys/vnode.h>
  67 #include <sys/sysent.h>
  68 #include <sys/reboot.h>
  69 #include <sys/sched.h>
  70 #include <sys/sx.h>
  71 #include <sys/sysproto.h>
  72 #include <sys/vmmeter.h>
  73 #include <sys/unistd.h>
  74 #include <sys/malloc.h>
  75 #include <sys/conf.h>
  76 #include <sys/cpuset.h>
  77
  78 #include <machine/cpu.h>
  79
  80 #include <security/audit/audit.h>
  81 #include <security/mac/mac_framework.h>
  82
  83 #include <vm/vm.h>
  84 #include <vm/vm_param.h>
  85 #include <vm/pmap.h>
  86 #include <vm/vm_map.h>
  87 #include <sys/copyright.h>
  88
  89 #include <ddb/ddb.h>
  90 #include <ddb/db_sym.h>
  91
  92 void mi_startup(void);                          /* Should be elsewhere */
  93
  94 /* Components of the first process -- never freed. */
  95 static struct session session0;
  96 static struct pgrp pgrp0;
  97 struct  proc proc0;
  98 struct  thread thread0 __aligned(16);
  99 struct  vmspace vmspace0;
 100 struct  proc *initproc;
 101
 102 int     boothowto = 0;          /* initialized so that it can be patched */
 103 SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0, "");
 104 int     bootverbose;
 105 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0, "");
 106
 107 /*
 108  * This ensures that there is at least one entry so that the sysinit_set
 109  * symbol is not undefined.  A sybsystem ID of SI_SUB_DUMMY is never
 110  * executed.
 111  */
 112 SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
 113
 114 /*
 115  * The sysinit table itself.  Items are checked off as the are run.
 116  * If we want to register new sysinit types, add them to newsysinit.
 117  */
 118 SET_DECLARE(sysinit_set, struct sysinit);
 119 struct sysinit **sysinit, **sysinit_end;
 120 struct sysinit **newsysinit, **newsysinit_end;
 121
 122 /*
 123  * Merge a new sysinit set into the current set, reallocating it if
 124  * necessary.  This can only be called after malloc is running.
 125  */
 126 void
 127 sysinit_add(struct sysinit **set, struct sysinit **set_end)
 128 {
 129         struct sysinit **newset;
 130         struct sysinit **sipp;
 131         struct sysinit **xipp;
 132         int count;
 133
 134         count = set_end - set;
 135         if (newsysinit)
 136                 count += newsysinit_end - newsysinit;
 137         else
 138                 count += sysinit_end - sysinit;
 139         newset = malloc(count * sizeof(*sipp), M_TEMP, M_NOWAIT);
 140         if (newset == NULL)
 141                 panic("cannot malloc for sysinit");
 142         xipp = newset;
 143         if (newsysinit)
 144                 for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
 145                         *xipp++ = *sipp;
 146         else
 147                 for (sipp = sysinit; sipp < sysinit_end; sipp++)
 148                         *xipp++ = *sipp;
 149         for (sipp = set; sipp < set_end; sipp++)
 150                 *xipp++ = *sipp;
 151         if (newsysinit)
 152                 free(newsysinit, M_TEMP);
 153         newsysinit = newset;
 154         newsysinit_end = newset + count;
 155 }
 156
 157 /*
 158  * System startup; initialize the world, create process 0, mount root
 159  * filesystem, and fork to create init and pagedaemon.  Most of the
 160  * hard work is done in the lower-level initialization routines including
 161  * startup(), which does memory initialization and autoconfiguration.
 162  *
 163  * This allows simple addition of new kernel subsystems that require
 164  * boot time initialization.  It also allows substitution of subsystem
 165  * (for instance, a scheduler, kernel profiler, or VM system) by object
 166  * module.  Finally, it allows for optional "kernel threads".
 167  */
 168 void
 169 mi_startup(void)
 170 {
 171
 172         register struct sysinit **sipp;         /* system initialization*/
 173         register struct sysinit **xipp;         /* interior loop of sort*/
 174         register struct sysinit *save;          /* bubble*/
 175
 176 #if defined(VERBOSE_SYSINIT)
 177         int last;
 178         int verbose;
 179 #endif
 180
 181         if (boothowto & RB_VERBOSE)
 182                 bootverbose++;
 183
 184         if (sysinit == NULL) {
 185                 sysinit = SET_BEGIN(sysinit_set);
 186                 sysinit_end = SET_LIMIT(sysinit_set);
 187         }
 188
 189 restart:
 190         /*
 191          * Perform a bubble sort of the system initialization objects by
 192          * their subsystem (primary key) and order (secondary key).
 193          */
 194         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 195                 for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
 196                         if ((*sipp)->subsystem < (*xipp)->subsystem ||
 197                              ((*sipp)->subsystem == (*xipp)->subsystem &&
 198                               (*sipp)->order <= (*xipp)->order))
 199                                 continue;       /* skip*/
 200                         save = *sipp;
 201                         *sipp = *xipp;
 202                         *xipp = save;
 203                 }
 204         }
 205
 206 #if defined(VERBOSE_SYSINIT)
 207         last = SI_SUB_COPYRIGHT;
 208         verbose = 0;
 209 #if !defined(DDB)
 210         printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
 211 #endif
 212 #endif
 213
 214         /*
 215          * Traverse the (now) ordered list of system initialization tasks.
 216          * Perform each task, and continue on to the next task.
 217          *
 218          * The last item on the list is expected to be the scheduler,
 219          * which will not return.
 220          */
 221         for (sipp = sysinit; sipp < sysinit_end; sipp++) {
 222
 223                 if ((*sipp)->subsystem == SI_SUB_DUMMY)
 224                         continue;       /* skip dummy task(s)*/
 225
 226                 if ((*sipp)->subsystem == SI_SUB_DONE)
 227                         continue;
 228
 229 #if defined(VERBOSE_SYSINIT)
 230                 if ((*sipp)->subsystem > last) {
 231                         verbose = 1;
 232                         last = (*sipp)->subsystem;
 233                         printf("subsystem %x\n", last);
 234                 }
 235                 if (verbose) {
 236 #if defined(DDB)
 237                         const char *name;
 238                         c_db_sym_t sym;
 239                         db_expr_t  offset;
 240
 241                         sym = db_search_symbol((vm_offset_t)(*sipp)->func,
 242                             DB_STGY_PROC, &offset);
 243                         db_symbol_values(sym, &name, NULL);
 244                         if (name != NULL)
 245                                 printf("   %s(%p)... ", name, (*sipp)->udata);
 246                         else
 247 #endif
 248                                 printf("   %p(%p)... ", (*sipp)->func,
 249                                     (*sipp)->udata);
 250                 }
 251 #endif
 252
 253                 /* Call function */
 254                 (*((*sipp)->func))((*sipp)->udata);
 255
 256 #if defined(VERBOSE_SYSINIT)
 257                 if (verbose)
 258                         printf("done.\n");
 259 #endif
 260
 261                 /* Check off the one we're just done */
 262                 (*sipp)->subsystem = SI_SUB_DONE;
 263
 264                 /* Check if we've installed more sysinit items via KLD */
 265                 if (newsysinit != NULL) {
 266                         if (sysinit != SET_BEGIN(sysinit_set))
 267                                 free(sysinit, M_TEMP);
 268                         sysinit = newsysinit;
 269                         sysinit_end = newsysinit_end;
 270                         newsysinit = NULL;
 271                         newsysinit_end = NULL;
 272                         goto restart;
 273                 }
 274         }
 275
 276         panic("Shouldn't get here!");
 277         /* NOTREACHED*/
 278 }
 279
 280
 281 /*
 282  ***************************************************************************
 283  ****
 284  **** The following SYSINIT's belong elsewhere, but have not yet
 285  **** been moved.
 286  ****
 287  ***************************************************************************
 288  */
 289 static void
 290 print_caddr_t(void *data)
 291 {
 292         printf("%s", (char *)data);
 293 }
 294
 295 static void
 296 print_version(void *data __unused)
 297 {
 298         int len;
 299
 300         /* Strip a trailing newline from version. */
 301         len = strlen(version);
 302         while (len > 0 && version[len - 1] == '\n')
 303                 len--;
 304         printf("%.*s %s\n", len, version, machine);
 305 }
 306
 307 SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
 308     copyright);
 309 SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
 310     trademark);
 311 SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
 312
 313 #ifdef WITNESS
 314 static char wit_warn[] =
 315      "WARNING: WITNESS option enabled, expect reduced performance.\n";
 316 SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
 317    print_caddr_t, wit_warn);
 318 SYSINIT(witwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 1,
 319    print_caddr_t, wit_warn);
 320 #endif
 321
 322 #ifdef DIAGNOSTIC
 323 static char diag_warn[] =
 324      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
 325 SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
 326     print_caddr_t, diag_warn);
 327 SYSINIT(diagwarn2, SI_SUB_RUN_SCHEDULER, SI_ORDER_THIRD + 2,
 328     print_caddr_t, diag_warn);
 329 #endif
 330
 331 static int
 332 null_fetch_syscall_args(struct thread *td __unused,
 333     struct syscall_args *sa __unused)
 334 {
 335
 336         panic("null_fetch_syscall_args");
 337 }
 338
 339 static void
 340 null_set_syscall_retval(struct thread *td __unused, int error __unused)
 341 {
 342
 343         panic("null_set_syscall_retval");
 344 }
 345
 346 struct sysentvec null_sysvec = {
 347         .sv_size        = 0,
 348         .sv_table       = NULL,
 349         .sv_mask        = 0,
 350         .sv_sigsize     = 0,
 351         .sv_sigtbl      = NULL,
 352         .sv_errsize     = 0,
 353         .sv_errtbl      = NULL,
 354         .sv_transtrap   = NULL,
 355         .sv_fixup       = NULL,
 356         .sv_sendsig     = NULL,
 357         .sv_sigcode     = NULL,
 358         .sv_szsigcode   = NULL,
 359         .sv_prepsyscall = NULL,
 360         .sv_name        = "null",
 361         .sv_coredump    = NULL,
 362         .sv_imgact_try  = NULL,
 363         .sv_minsigstksz = 0,
 364         .sv_pagesize    = PAGE_SIZE,
 365         .sv_minuser     = VM_MIN_ADDRESS,
 366         .sv_maxuser     = VM_MAXUSER_ADDRESS,
 367         .sv_usrstack    = USRSTACK,
 368         .sv_psstrings   = PS_STRINGS,
 369         .sv_stackprot   = VM_PROT_ALL,
 370         .sv_copyout_strings     = NULL,
 371         .sv_setregs     = NULL,
 372         .sv_fixlimit    = NULL,
 373         .sv_maxssiz     = NULL,
 374         .sv_flags       = 0,
 375         .sv_set_syscall_retval = null_set_syscall_retval,
 376         .sv_fetch_syscall_args = null_fetch_syscall_args,
 377         .sv_syscallnames = NULL,
 378         .sv_schedtail   = NULL,
 379 };
 380
 381 /*
 382  ***************************************************************************
 383  ****
 384  **** The two following SYSINIT's are proc0 specific glue code.  I am not
 385  **** convinced that they can not be safely combined, but their order of
 386  **** operation has been maintained as the same as the original init_main.c
 387  **** for right now.
 388  ****
 389  **** These probably belong in init_proc.c or kern_proc.c, since they
 390  **** deal with proc0 (the fork template process).
 391  ****
 392  ***************************************************************************
 393  */
 394 /* ARGSUSED*/
 395 static void
 396 proc0_init(void *dummy __unused)
 397 {
 398         struct proc *p;
 399         unsigned i;
 400         struct thread *td;
 401
 402         GIANT_REQUIRED;
 403         p = &proc0;
 404         td = &thread0;
 405
 406         /*
 407          * Initialize magic number and osrel.
 408          */
 409         p->p_magic = P_MAGIC;
 410         p->p_osrel = osreldate;
 411
 412         /*
 413          * Initialize thread and process structures.
 414          */
 415         procinit();     /* set up proc zone */
 416         threadinit();   /* set up UMA zones */
 417
 418         /*
 419          * Initialise scheduler resources.
 420          * Add scheduler specific parts to proc, thread as needed.
 421          */
 422         schedinit();    /* scheduler gets its house in order */
 423         /*
 424          * Initialize sleep queue hash table
 425          */
 426         sleepinit();
 427
 428         /*
 429          * additional VM structures
 430          */
 431         vm_init2();
 432
 433         /*
 434          * Create process 0 (the swapper).
 435          */
 436         LIST_INSERT_HEAD(&allproc, p, p_list);
 437         LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
 438         mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
 439         p->p_pgrp = &pgrp0;
 440         LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
 441         LIST_INIT(&pgrp0.pg_members);
 442         LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
 443
 444         pgrp0.pg_session = &session0;
 445         mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
 446         refcount_init(&session0.s_count, 1);
 447         session0.s_leader = p;
 448
 449         p->p_sysent = &null_sysvec;
 450         p->p_flag = P_SYSTEM | P_INMEM;
 451         p->p_state = PRS_NORMAL;
 452         knlist_init_mtx(&p->p_klist, &p->p_mtx);
 453         STAILQ_INIT(&p->p_ktr);
 454         p->p_nice = NZERO;
 455         td->td_tid = PID_MAX + 1;
 456         td->td_state = TDS_RUNNING;
 457         td->td_pri_class = PRI_TIMESHARE;
 458         td->td_user_pri = PUSER;
 459         td->td_base_user_pri = PUSER;
 460         td->td_priority = PVM;
 461         td->td_base_pri = PVM;
 462         td->td_oncpu = 0;
 463         td->td_flags = TDF_INMEM|TDP_KTHREAD;
 464         td->td_cpuset = cpuset_thread0();
 465         prison0.pr_cpuset = cpuset_ref(td->td_cpuset);
 466         p->p_peers = 0;
 467         p->p_leader = p;
 468
 469
 470         strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
 471         strncpy(td->td_name, "swapper", sizeof (td->td_name));
 472
 473         callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
 474         callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
 475         callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
 476
 477         /* Create credentials. */
 478         p->p_ucred = crget();
 479         p->p_ucred->cr_ngroups = 1;     /* group 0 */
 480         p->p_ucred->cr_uidinfo = uifind(0);
 481         p->p_ucred->cr_ruidinfo = uifind(0);
 482         p->p_ucred->cr_prison = &prison0;
 483 #ifdef AUDIT
 484         audit_cred_kproc0(p->p_ucred);
 485 #endif
 486 #ifdef MAC
 487         mac_cred_create_swapper(p->p_ucred);
 488 #endif
 489         td->td_ucred = crhold(p->p_ucred);
 490
 491         /* Create sigacts. */
 492         p->p_sigacts = sigacts_alloc();
 493
 494         /* Initialize signal state for process 0. */
 495         siginit(&proc0);
 496
 497         /* Create the file descriptor table. */
 498         p->p_fd = fdinit(NULL);
 499         p->p_fdtol = NULL;
 500
 501         /* Create the limits structures. */
 502         p->p_limit = lim_alloc();
 503         for (i = 0; i < RLIM_NLIMITS; i++)
 504                 p->p_limit->pl_rlimit[i].rlim_cur =
 505                     p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
 506         p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
 507             p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
 508         p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
 509             p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
 510         i = ptoa(cnt.v_free_count);
 511         p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = i;
 512         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = i;
 513         p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = i / 3;
 514         p->p_cpulimit = RLIM_INFINITY;
 515
 516         p->p_stats = pstats_alloc();
 517
 518         /* Allocate a prototype map so we have something to fork. */
 519         pmap_pinit0(vmspace_pmap(&vmspace0));
 520         p->p_vmspace = &vmspace0;
 521         vmspace0.vm_refcnt = 1;
 522
 523         /*
 524          * proc0 is not expected to enter usermode, so there is no special
 525          * handling for sv_minuser here, like is done for exec_new_vmspace().
 526          */
 527         vm_map_init(&vmspace0.vm_map, p->p_sysent->sv_minuser,
 528             p->p_sysent->sv_maxuser);
 529         vmspace0.vm_map.pmap = vmspace_pmap(&vmspace0);
 530
 531         /*-
 532          * call the init and ctor for the new thread and proc
 533          * we wait to do this until all other structures
 534          * are fairly sane.
 535          */
 536         EVENTHANDLER_INVOKE(process_init, p);
 537         EVENTHANDLER_INVOKE(thread_init, td);
 538         EVENTHANDLER_INVOKE(process_ctor, p);
 539         EVENTHANDLER_INVOKE(thread_ctor, td);
 540
 541         /*
 542          * Charge root for one process.
 543          */
 544         (void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
 545 }
 546 SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
 547
 548 /* ARGSUSED*/
 549 static void
 550 proc0_post(void *dummy __unused)
 551 {
 552         struct timespec ts;
 553         struct proc *p;
 554         struct rusage ru;
 555         struct thread *td;
 556
 557         /*
 558          * Now we can look at the time, having had a chance to verify the
 559          * time from the filesystem.  Pretend that proc0 started now.
 560          */
 561         sx_slock(&allproc_lock);
 562         FOREACH_PROC_IN_SYSTEM(p) {
 563                 microuptime(&p->p_stats->p_start);
 564                 PROC_SLOCK(p);
 565                 rufetch(p, &ru);        /* Clears thread stats */
 566                 PROC_SUNLOCK(p);
 567                 p->p_rux.rux_runtime = 0;
 568                 p->p_rux.rux_uticks = 0;
 569                 p->p_rux.rux_sticks = 0;
 570                 p->p_rux.rux_iticks = 0;
 571                 FOREACH_THREAD_IN_PROC(p, td) {
 572                         td->td_runtime = 0;
 573                 }
 574         }
 575         sx_sunlock(&allproc_lock);
 576         PCPU_SET(switchtime, cpu_ticks());
 577         PCPU_SET(switchticks, ticks);
 578
 579         /*
 580          * Give the ``random'' number generator a thump.
 581          */
 582         nanotime(&ts);
 583         srandom(ts.tv_sec ^ ts.tv_nsec);
 584 }
 585 SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
 586
 587 static void
 588 random_init(void *dummy __unused)
 589 {
 590
 591         /*
 592          * After CPU has been started we have some randomness on most
 593          * platforms via get_cyclecount().  For platforms that don't
 594          * we will reseed random(9) in proc0_post() as well.
 595          */
 596         srandom(get_cyclecount());
 597 }
 598 SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
 599
 600 /*
 601  ***************************************************************************
 602  ****
 603  **** The following SYSINIT's and glue code should be moved to the
 604  **** respective files on a per subsystem basis.
 605  ****
 606  ***************************************************************************
 607  */
 608
 609
 610 /*
 611  ***************************************************************************
 612  ****
 613  **** The following code probably belongs in another file, like
 614  **** kern/init_init.c.
 615  ****
 616  ***************************************************************************
 617  */
 618
 619 /*
 620  * List of paths to try when searching for "init".
 621  */
 622 static char init_path[MAXPATHLEN] =
 623 #ifdef  INIT_PATH
 624     __XSTRING(INIT_PATH);
 625 #else
 626     "/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init:/stand/sysinstall";
 627 #endif
 628 SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
 629         "Path used to search the init process");
 630
 631 /*
 632  * Shutdown timeout of init(8).
 633  * Unused within kernel, but used to control init(8), hence do not remove.
 634  */
 635 #ifndef INIT_SHUTDOWN_TIMEOUT
 636 #define INIT_SHUTDOWN_TIMEOUT 120
 637 #endif
 638 static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
 639 SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
 640         CTLFLAG_RW, &init_shutdown_timeout, 0, "");
 641
 642 /*
 643  * Start the initial user process; try exec'ing each pathname in init_path.
 644  * The program is invoked with one argument containing the boot flags.
 645  */
 646 static void
 647 start_init(void *dummy)
 648 {
 649         vm_offset_t addr;
 650         struct execve_args args;
 651         int options, error;
 652         char *var, *path, *next, *s;
 653         char *ucp, **uap, *arg0, *arg1;
 654         struct thread *td;
 655         struct proc *p;
 656
 657         mtx_lock(&Giant);
 658
 659         GIANT_REQUIRED;
 660
 661         td = curthread;
 662         p = td->td_proc;
 663
 664         vfs_mountroot();
 665
 666         /*
 667          * Need just enough stack to hold the faked-up "execve()" arguments.
 668          */
 669         addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
 670         if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE,
 671                         FALSE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
 672                 panic("init: couldn't allocate argument space");
 673         p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
 674         p->p_vmspace->vm_ssize = 1;
 675
 676         if ((var = getenv("init_path")) != NULL) {
 677                 strlcpy(init_path, var, sizeof(init_path));
 678                 freeenv(var);
 679         }
 680
 681         for (path = init_path; *path != '\0'; path = next) {
 682                 while (*path == ':')
 683                         path++;
 684                 if (*path == '\0')
 685                         break;
 686                 for (next = path; *next != '\0' && *next != ':'; next++)
 687                         /* nothing */ ;
 688                 if (bootverbose)
 689                         printf("start_init: trying %.*s\n", (int)(next - path),
 690                             path);
 691
 692                 /*
 693                  * Move out the boot flag argument.
 694                  */
 695                 options = 0;
 696                 ucp = (char *)p->p_sysent->sv_usrstack;
 697                 (void)subyte(--ucp, 0);         /* trailing zero */
 698                 if (boothowto & RB_SINGLE) {
 699                         (void)subyte(--ucp, 's');
 700                         options = 1;
 701                 }
 702 #ifdef notyet
 703                 if (boothowto & RB_FASTBOOT) {
 704                         (void)subyte(--ucp, 'f');
 705                         options = 1;
 706                 }
 707 #endif
 708
 709 #ifdef BOOTCDROM
 710                 (void)subyte(--ucp, 'C');
 711                 options = 1;
 712 #endif
 713
 714                 if (options == 0)
 715                         (void)subyte(--ucp, '-');
 716                 (void)subyte(--ucp, '-');               /* leading hyphen */
 717                 arg1 = ucp;
 718
 719                 /*
 720                  * Move out the file name (also arg 0).
 721                  */
 722                 (void)subyte(--ucp, 0);
 723                 for (s = next - 1; s >= path; s--)
 724                         (void)subyte(--ucp, *s);
 725                 arg0 = ucp;
 726
 727                 /*
 728                  * Move out the arg pointers.
 729                  */
 730                 uap = (char **)((intptr_t)ucp & ~(sizeof(intptr_t)-1));
 731                 (void)suword((caddr_t)--uap, (long)0);  /* terminator */
 732                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
 733                 (void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
 734
 735                 /*
 736                  * Point at the arguments.
 737                  */
 738                 args.fname = arg0;
 739                 args.argv = uap;
 740                 args.envv = NULL;
 741
 742                 /*
 743                  * Now try to exec the program.  If can't for any reason
 744                  * other than it doesn't exist, complain.
 745                  *
 746                  * Otherwise, return via fork_trampoline() all the way
 747                  * to user mode as init!
 748                  */
 749                 if ((error = execve(td, &args)) == 0) {
 750                         mtx_unlock(&Giant);
 751                         return;
 752                 }
 753                 if (error != ENOENT)
 754                         printf("exec %.*s: error %d\n", (int)(next - path),
 755                             path, error);
 756         }
 757         printf("init: not found in path %s\n", init_path);
 758         panic("no init");
 759 }
 760
 761 /*
 762  * Like kproc_create(), but runs in it's own address space.
 763  * We do this early to reserve pid 1.
 764  *
 765  * Note special case - do not make it runnable yet.  Other work
 766  * in progress will change this more.
 767  */
 768 static void
 769 create_init(const void *udata __unused)
 770 {
 771         struct ucred *newcred, *oldcred;
 772         int error;
 773
 774         error = fork1(&thread0, RFFDG | RFPROC | RFSTOPPED, 0, &initproc);
 775         if (error)
 776                 panic("cannot fork init: %d\n", error);
 777         KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
 778         /* divorce init's credentials from the kernel's */
 779         newcred = crget();
 780         PROC_LOCK(initproc);
 781         initproc->p_flag |= P_SYSTEM | P_INMEM;
 782         oldcred = initproc->p_ucred;
 783         crcopy(newcred, oldcred);
 784 #ifdef MAC
 785         mac_cred_create_init(newcred);
 786 #endif
 787 #ifdef AUDIT
 788         audit_cred_proc1(newcred);
 789 #endif
 790         initproc->p_ucred = newcred;
 791         PROC_UNLOCK(initproc);
 792         crfree(oldcred);
 793         cred_update_thread(FIRST_THREAD_IN_PROC(initproc));
 794         cpu_set_fork_handler(FIRST_THREAD_IN_PROC(initproc), start_init, NULL);
 795 }
 796 SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
 797
 798 /*
 799  * Make it runnable now.
 800  */
 801 static void
 802 kick_init(const void *udata __unused)
 803 {
 804         struct thread *td;
 805
 806         td = FIRST_THREAD_IN_PROC(initproc);
 807         thread_lock(td);
 808         TD_SET_CAN_RUN(td);
 809         sched_add(td, SRQ_BORING);
 810         thread_unlock(td);
 811 }
 812 SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST, kick_init, NULL);